base station device, mobile station device, communication system, transmission method, reception met

专利摘要:
BASE STATION DEVICE, MOBILE STATION DEVICE, COMMUNICATION SYSTEM, TRANSMISSION METHOD, RECEPTION METHOD, AND COMMUNICATION METHOD.Intercellular interference is efficiently mitigated or suppressed in a radio communication system constituting a heterogeneous network. In the radio communication system in which a base station device and a mobile station device communicate with each other, the base station device notifies control information related to a reference signal to the mobile station device. cell specific which is specific to a cell ID of another base station device other than the base station device mentioned above, the control information containing information regarding the number of ports for the cell specific reference signal.
公开号:BR112013020109A2
申请号:R112013020109-6
申请日:2012-02-03
公开日:2020-08-04
发明作者:Takashi Yoshimoto；Kazuyuki Shimezawa
申请人:Sharp Kabushiki Kaisha；
IPC主号:

专利说明:

Invention Patent Descriptive Report for "BASE STATION DEVICE, MOBILE STATION DEVICE, COMMUNICATION SYSTEM, TRANSMISSION METHOD, RECEPTION METHOD, AND COMMUNICATION METHOD". Technical Field The present invention relates to a base station device, a mobile station device, a communication system, a transmission method, a reception method, and a communication method.
Fundamental Technique In radio communication systems, such as WCDMA (Multiple Access by Broadband Code Division), LTE (Long Term Evolution), and LTE-A (Advanced LTE) which are proposed by 3GPP (Pro- 3rd Partnership project.
Generation), and WiMAX (World Interoperability for Microwave Access) proposed by IEEE (the Institute of Electrical and Electronic Engineers), a communication area can be increased by providing a cellular configuration including a plurality of station devices base (each also called eNB or eNodeB) developed so that the bands (cells) in each of which the base station device is connected with a mobile station device (also called a terminal or UE ( User)) are configured to be partially overlapped by each other.
In order to increase the efficiency of frequency utilization of cells in the cellular configuration described above, it is studied, as discussed in the Non-Patent Literature (NPL) 1 mentioned below, (i) the repeated use of the same frequency by individual cells, or ( ii) the construction of a heterogeneous network in which, in addition to a base station device (macrocell) having a cell radius from several hundred meters to more than tens of kilometers, other base station devices (each called a peak cell, femto cell, or domestic eNodeB) having several cell rays are developed so that the bands of the other base station devices overlap totally or partially with the macrocell.
Fig. 22 is a schematic view illustrating an example of a downlink in a radio communication system in which base station devices having different cell radii are developed. A 1000-2 base station device is developed with 5 Single Frequency Reuse so that the 1000-2a cell (for example, a peak cell) of the 1000-2 base station device overlaps a 1000- 1a (macrocell) of a 1000- base station device
1. A mobile station device is preferably controlled to be connected by radio to the base station device capable of receiving a signal with greater intensity from a received electric field. In figure 22, a 2000-1 mobile station device is connected by radio (as denoted by r11) to the 1000-1 base station device, and the 2000-2 and 2000-3 mobile station devices are connected by radio to the base station device 1000-2 (as denoted by r21 and r23). Additionally, when the peak cell is developed to include a cell border and around the macrocell (that is, in a region where the electric field strength is weak), the energy of a signal received by the station device mobile can be increased by connecting the 2000-3 mobile station device, which is present at the edge of the macrocell cell, to the peak cell. Thus, by building a heterogeneous network as described above, the frequency utilization efficiency can be increased in total when observed from the networks present in an area covered by a macrocell. Citation List Non-Patent Literature NPL 1: 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Further Advancements for E-UTRA Physical Layer Aspects (Release 9), 3GPP TR36.814 v9. 0.0 (2010-03) URL: http: //3gpp.org/ftp/Specs/html-info/36814.htm Summary of the Invention Technical Problem However, there is a problem in which, in the heterogeneous network 19168738v1
A signal st (t) of a first OFDM symbol sent from the GI 108 insertion unit is expressed by the following formula: Mathematics 1
In the above formula, 1Ts ≤ t <(+ 1) Ts is satisfied and Ts denotes a 5 OFDM signal length (Ts = Tf + TG). Tf denotes an FFT interval length.
TG denotes a GI length.
Nf denotes the number of IDFT points.
Ck, denotes a data modulation symbol, a control signal, or a reference signal mapped to a subcarrier k of a first OFDM symbol. ∆f denotes a subcarrier range.
In LTE, for example, Nf is 2048 and ∆f is 15 kHz.
The transmission unit 109 performs the D / A conversion (digital to analog) of the OFDM symbol registered from the GI insertion unit 108 to generate an analog signal, and additionally generates a band-limited signal by limiting one band of the analog signal generated with a filtering process.
Transmission unit 109 converts the generated limited band signal upstream to a radio frequency band to generate a carrier band OFDM and transmits the generated carrier band OFDM signal in the form of an electrical wave to for the mobile station device 200-u from the transmission antenna unit 101-n.
In the 100-α base station device, the transmission of a plurality of transmission antennas can be carried out as Diversity transmission or MIMO transmission (multiple inputs and multiple outputs). Figure 3 illustrates a transmission frame format for a downlink of the base station device 100-1 in the radio communication system according to the first embodiment of the present invention.
The table is made up of ten plural types of subframes including Normal Subframes and limited subframes by resource mapping (hereinafter also referred to as "limited subframes"). An example of subframes limited by resource mapping is MBSFN (Rede de Fre-
19168738v1 Unique service quality for multicast and multimedia broadcast) or ABS (Almost Blank Subframe). The term "Normal Subframes" implies a subframe for which the resource mapping of information data, control data, 5 and reference signals, each transmitted from the base station device 100-1, according to Programming information described above is allowed.
For example, the Physical Downlink Shared Channel, the Physical Downlink Control Channel, the Synchronization Signal, the Physical Broadcast Channel, Cell-specific Reference Signal, the State Information Reference Signal Channel, paging signal, SIB-1, etc. can be mapped to the Normal Subframe by resource mapping.
On the other hand, the term "resource mapping limited subframe" implies a subframe for which the resource mapping is limited to predetermined signals transmitted from the base station device 100-1. In this modality, the MBSFN or ABS subframe is used as a subframe limited by resource mapping.
The MBSFN subframe is a subframe that is prepared to send a broadcast signal or a multicast signal.
The MBSFN subframe does not transmit the Cell-specific Reference (CRS) signal that is configured per cell in a data area (PDSCH), in anticipation of the simultaneous transmission of data from multiple cells.
Therefore, the mobile station device 200-u does not measure CRS in the MBSFN subframe.
Accordingly, the base station device 100-1 can stop the transmission of information data without being recognized by the mobile station device 200-u.
In the MBSFN sub-frame, for example, PDCCH and CRS in a PDCCH area are transmitted, but other data areas and CRSs in those data areas are not transmitted.
ABS is a subframe capable of transmitting only the Synchronization Signal, the Physical Diffusion Channel, the Cell Specific Reference Signal, the Channel State Information Reference Signal, the paging signal, and SIB-1. In other words, the resource mapping of the Physical Downlink Shared Channel and the Control Channel
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Each pair of resource blocks is created from 168 resource elements that occupy frequencies indicated by 12 subcarriers and times indicated by 14 OFDM symbols.
Control signals, such as PDCCH, are basically mapped in one to three areas at the beginning of the 14 OFDM 5 symbols making up the pair of resource blocks.
The eleven to thirteen remaining areas of the OFDM symbols are areas where data modulation symbols, such as PDSCH, are basically mapped.
The Cell-specific Reference Sign is mapped to the predetermined elements among the resource elements (that is, filled parts) constituting each resource block.
It should be noted that the resource element on which the Cell-specific Reference Signal is mapped is cyclically changed in the frequency direction depending on the cell ID of the 100-α base station device.
Using the subframe format illustrated in figure 4, the base station device 100-1 performs programming for the mobile station device 200-1 to perform the resource mapping of the PDSCH and PDCCH for only the Normal Subframes, taking into account resource information.
Thus, when the resource mapping unit 106 performs the resource mapping according to the programming information, the base station device 100-1 can transmit PDS-CH and PDCCH to the mobile station device 200-1 by employing only the Normal Subframes.
On the other hand, in the subframe limited by resource mapping, an empty part where PDCCH, for example, is mapped by resource mapping can be configured so that any signal is not mapped here.
As a result, Intercellular Interference with respect to the mobile station device connected to the base station device 100-2 can be mitigated in the subframe limited by resource mapping.
Figure 5 is a conceptual view illustrating another example of the subframe format according to the first embodiment of the present invention.
The example illustrated in figure 5 represents an illustrative case in which the base station device 100-α performs the transmission using two antennas (antenna ports). In figure 5, the horizontal direction represents time, and the vertical direction represents frequency.
The Cell-specific Reference Sign is mapped into predetermined elements (that is, filled parts) of the resource elements that make up each resource block 5.
In figure 5, the reference signal transmitted from one of the two antennas is mapped to a resource element 0 by the resource mapping.
The Cell-specific Reference Signal transmitted from another of the two antennas is mapped to a resource element 1 by the resource mapping.
The subframe format for the 100-α base station device is provided by the resource block arrangement of figure 5 in place of the resource block in the subframe format of figure 4. Figure 6 is a conceptual view illustrating another example of the subframe format according to this modality.
The example illustrated in figure 6 represents an illustrative case where the base station device 100-α performs the transmission using four antennas.
In figure 6, the horizontal direction represents time, and the vertical direction represents frequency.
The Cell-specific Reference Sign is mapped into predetermined elements (that is, filled parts) of the resource elements constituting each resource block.
In figure 6, the Cell-specific Reference Signal transmitted from one of the four antennas is mapped to a resource element 0 by the resource mapping.
The Cell-specific Reference Signal transmitted from one of the four antennas is mapped to a resource element 1 by the resource mapping.
The Cell-specific Reference Signal transmitted from another of the four antennas is mapped to a resource element 2 by the resource mapping.
The Cell-specific Reference Signal transmitted from another of the four antennas is mapped to a resource element 3 by the resource mapping.
The subframe format for the 100-α base station device is provided by the arrangement of the resource block of figure 6 in place of the resource block in the subframe format of figure 4. As described above, the number of reference signals is increased and reduced depending on the number of transmitting antennas and the number of
19168738v1 and / or the mobile station device 200-3 using a control signal.
Based on the cell ID and the number of CRS ports notified, the mobile station device can specify or estimate the resource element to which the relevant base station device has mapped the CRS by resource mapping, and a CRS value.
As a result, the mobile station device can perform the Cell-specific Reference Signal (CRS) cancellation process. RRC signaling can be transmitted with PBCH or PDSCH.
When the notification of the information indicating the necessity or not of the interference cancellation process or the cell information for executing the interference cancellation process with the downlink control signal by using RRC signaling transmitted with PBCH, the device base station 100-2 can notify the information mentioned above as Cell Specific information.
In addition, when the notification of information indicating the necessity or not of the interference cancellation process or cell information for the execution of the interference cancellation process with the downlink control signal by using RRC signaling transmitted with PDSCH , the base station device 100-2 can notify the information mentioned above as specific UE (User Equipment) information. Figure 8 is a transmission flowchart for the base station device 100-2 in the radio communication system according to the first embodiment of the present invention.
The base station device 100-2 obtains information regarding downlink transmission from an adjacent base station device (i.e., the base station device 100-1) through the return access channel connection 10 (S101). The information related to downlink transmission includes information regarding the transmission frame format.
Next, the base station device 100-2 determines, based on information related to downlink transmission,
19168738v1 whether or not the subframe transmitted from the base station device 100-1 is MBSFN (S102). If it is determined that the relevant subframe is not MBSFN (not in S102), the base station device 100-2 generates a control signal to notify the need for the cancellation process for the mobile station device 200-u (u = 2 and / or 3 in the case of figure 1) (S104). On the other hand, if it is determined that the relevant subframe is MBSFN (YES in S102), the base station device 100-2 generates a control signal to notify you that the cancellation process is not necessary for the mobile station device 200-u (u = 2 and / or 3 in the case of figure 1) (S103). Thereafter, the base station device 100-2 transmits the control signal and a data signal (e.g., PDSCH) to the mobile station device (S105), and terminates processing.
It should be noted that the control signal transmitted to the mobile station device can include cell information, the number of CRS ports, and other information.
The configuration of the mobile station device according to the first embodiment of the present invention will be described below.
Figure 9 is a schematic block diagram illustrating the configuration of the mobile station device 200-u (u = 1 to 3 in figure 1) in the radio communication system according to the first embodiment of the present invention.
The mobile station device 200-u includes a receiving antenna unit 201, a receiving unit 202, a channel estimating unit 203, a GI removal unit 204, a DFT unit 205, a unit interference removal 206, a channel compensation unit 207, a demodulation unit 208, a decoding unit 209, an upper layer 210, a control signal detection unit 211, a transmitting antenna unit are 221, a control signal generation unit 222, and a transmission unit 223. The receiving antenna unit 201 receives an OFDM signal in a carrier band, which is transmitted in the form of an electrical wave from the base station 100-2, and sends the received OFDM signal
19168738v1 on the carrier band to the receiving unit 201. At that time, the receiving antenna unit 201 additionally receives an OFDM signal on the carrier band, which is transmitted from the base station device 100-1 thereby causing Intercellular Interference. The receiving unit 202 downwardly converts the OFDM signal, the record from the receiving antenna unit 202 into a frequency band in which digital signal processing is executable, and additionally performs a filtering process of the converted signal from to remove the unnecessary (spurious) component. In addition, the receiving unit 202 performs the conversion (A / D: analog to digital) of the signal, which has been subjected to the filtering process, from an analog signal to a digital signal, and sends the digital signal converted to the channel estimation unit 203, the GI removal unit 204, and the control signal detection unit 211. The channel estimation unit 203 performs the channel estimation by using a reference signal contained in the signal sent from the receiving unit 202, thereby generating a channel estimate value.
Then, the channel estimation unit 203 notifies the channel estimate value for the interference removal unit 206, the channel compensation unit 207 and the upper layer 210. The channel estimate value is provided as a transfer function or impulse response, for example.
The control signal detection unit 211 detects the control signal (for example, PDCCH or RRC signaling) that is contained in the signal sent from the receiving unit 202. In addition, the control signal detection unit 211 extracts information regarding the MCS, the pre-coding matrix, and the number of cameras, which are applied to the information data, etc. contained in the control signal, and notifies the information extracted for the demodulation unit 208 and the decoding unit 209. Additionally, the control signal detection unit 211 extracts the information indicating whether or not the process cancellation on the mobile station device and cell information from the appropriate method source.
The channel compensation unit 207 multiplies the recorded frequency domain signal from the interference removal unit 206 by the calculated weight coefficient, thereby executing the channel compensation. 5 Demodulation unit 208 performs a demodulation process on a signal (data modulation symbol) after channel compensation, the signal being recorded from channel compensation unit 207. The demodulation can be performed with a difficult decision (calculation of a coded bit string) or easy decision (calculation of the LLR code bit). The decoding unit 209 calculates the information data, transmitted to be sent to the relevant mobile station device, by executing an error correction decoding process on the coded bit sequence (or coded bit LLR) after demodulation. , which is sent from the demodulation unit 208, and sends the calculated information data to the upper layer 210. A method used in the error correction decoding process, for example, turbo coding or convoluted coding, which was performed on the base station device 100 as a transmission source.
The error correction coding process can be performed with a difficult decision or an easy decision.
When the base station device transmits the interleaved data modulation symbols, the decoding unit 209 performs, before the error correction decoding process, an encoded input bit sequence deinterleaving process corresponding to the interleaving on the device base station.
The decoding unit 209 then performs the error correction decoding process on the signal that has been subjected to the deinterleaving process.
The control signal generation unit 222 generates a control signal for the transmission of feedback information (including CQI, RI and PMI) to the base station device.
The return information is determined by the upper layer 210 based on the channel estimate value calculated by the channel estimate unit 203.
positive mobile station 200-3 generate a replica of the known signal in the subframe limited by resource mapping.
The interference replica generation unit 242 multiplies the transmission signal replica by the channel estimate value, thereby generating an interference replica.
Subtractor 243 subtracts the generated interference replica from the frequency domain signal sent from the DFT unit 205, and then sends the frequency domain output after subtraction to channel compensation unit 207. A signal at the subcarrier k of the first OFDM symbol sent from subtractor 243 is expressed by the following formula.
Mathematics 2
In the formula above, it denotes a signal in subcarrier k of the first OFDM symbol in the frame limited by resource mapping sent from the DFT 205 unit. It denotes an interference replica in the frame limited by resource mapping, and is expressed by a formula provided below.
It should be noted that the expressions "R ^" and "R ~" imply symbols, which correspond to alphabets "R" added respectively with "^" and "~" placed above them, as expressed in the formula (2). These expressions are applied similarly to "s ^", "c ^" and "H ^" used below.
Mathematics 3
In the formula above, it denotes a transfer function of subcarrier k of the first OFDM symbol, which was estimated by the channel estimation unit 203. sk, ℓ ^ denotes a replica of a transmission signal in subcarrier k of the first OFDM symbol, which was generated by the transmission signal replica generation unit 241. it is a replica that is made from known signals (for example, CRS, PSS and SSS) in the resource elements where these known signals are mapped, and
19168738v1
100-1 and illustrated in the upper stage of figure 13. In one example, the information indicating whether or not the cancellation is required is configured to (i) notify the cancellation process for the sub-frame in which the MBSFN sub-frame is required. 5 transmitted from the base station device 100-1 and (ii) to notify the need for the cancellation process for the subframe in which the Normal Subframe and / or ABS subframe is transmitted from the base station device 100-1. The base station device 100-2 prepares, for example, a 1-bit area to indicate the information regarding the need or not for the cancellation of interference in the PDCCH or RRC signaling, and notifies the need for the cancellation process by the configuration - tion "0" in this area and the need for the cancellation process by setting "1" in that area.
Upon receipt of the control signal that includes the information indicating whether or not the cancellation is required, the mobile station device 200-2 and / or the mobile station device 200-3 performs the cancellation process in the subframe based on the information indicating whether or not the cancellation is required.
In another example, information indicating whether or not cancellation is required notifies the layout of the Normal Subframe, MBSFN subframe and the ABS Subframe in the format transmitted from the base station device 100-1. The base station device 100-2 prepares, for example, a 2-bit area to indicate the information regarding the need or not to cancel interference in PDCCH or R-RC signaling, and notify the Normal Subframe by the configuration "01" in this area, the MBSFN subframe for the "10" setting in that area, and ABS for the "11" setting in that area.
The mobile station device 200-2 and / or the mobile station device 200-3 having received the control signal, which includes the information indicating whether or not the cancellation is required, performs the cancellation process in the relevant subframe upon obtaining the information "01" and / or "11", each indicating the need for cancellation or not, and then
19168738v1 formation related to downlink transmission from the base station device 100-1 through the return access channel connection 10 in figure 1 (S401). Downlink-related information includes transmission format information 5 indicating, for example, the arrangement of Normal Subframe and / or limited resource mapping subframe, cell ID, number of CRS ports, etc.
The base station device 100-2 generates a control signal, which includes control information related to the cancellation process, based on information related to downlink transmission (S402), and transmits the control generated for the mobile station device 200-2 (S403). Control information related to the cancellation process includes information indicating whether or not the interference cancellation process is required, cell information to perform interference cancellation, and so on.
The signaling of the control information related to the cancellation process can be performed using the signaling method described above in the first to fourth modalities.
The mobile station device 200-2 generates the feedback information based on the control information related to the cancellation process (S404), and notifies the feedback information generated to the base station device 100-2 (S405) . Figure 21 is a flow chart illustrating the generation of feedback information in the fifth embodiment of the present invention.
The control signal detection unit 211 of the mobile station device 200-2 extracts the control information related to the interference cancellation process from the downlink control signal transmitted from the base station device 100 -1 and obtains the information indicating the need or not of the interference cancellation process (S501). if the need for the interference cancellation process is notified (YES in S502), the mobile station device 200-2 configures the feedback information, such as CQI and RI, considering not only the channel status, but also the application of the information cancellation process
19168738v1 reference (S504). On the other hand, if the non-need for the interference cancellation process is notified (NOT in S502), the mobile station device 200-2 configures the return information, such as CQI and RI, based on 5 channel state (S503). The mobile station device 202-2 then notifies the return information configured for the base station device 100-2 (S505). It is noted that the channel state is estimated from the reference signal, for example, CRS, transmitted from the base station device 100-2. Returning to figure 20, the base station device 100-2 configures, based on the feedback information, MCS, number of layers, etc. of a data signal transmitted to the mobile station device 200-2 and generates PDSCH by executing the coding process, modulation process, pre-coding process, etc., based on the parameters mentioned above (S406). The base station device 100-2 additionally generates the Physical Downlink Control Channel (PDCCH) to notify the MCS, the number of layers, etc. (S406). After that, the base station device 100-2 transmits PDSCH and PDCCH to the mobile station device 200-2 (S407). Upon receipt of PDSCH and PDCCH, the mobile station device 200-2 performs a PDSCH detection process (including the demodulation process and the decoding process) by applying the information-based interference cancellation process, such co- mo MCS and number of layers, which are determined in PDCCH (S408). According to the fifth embodiment of the present invention, as described above, the mobile station device generates feedback information considering not only the channel state, but also the need or not to apply the interference cancellation process.
The base station device transmits the data signal to the mobile station device based on the feedback information.
In this way, since the base station device 100-2 can configure MCS and the number of layers (number of space multiplexing)
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Industrial Applicability The present invention can be suitably applied to a radio base station device, a radio terminal device, a radio communication system, and a radio communication method. 5 List of Reference Signals 100-1, 100-2 base station devices 200-1, 200-2, 200-3 mobile station devices 101 transmission antenna unit 102 upper layer 103 symbol generation unit 104 control signal generation 105 reference signal generation unit 106 resource mapping unit 107 IDFT unit 108 GI insertion unit 109 transmission unit 111 coding unit 112 modulation unit 121 receiving antenna unit 122 receiving unit 123 control signal detection unit 201 receiving antenna unit 202 receiving unit 203 channel estimating unit 204 GI removal unit 205 DFT unit 206 interference removing unit 207 channel compensation unit 208 demodulation unit 209 unit decoder 210 top layer 211 control signal detection unit
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221 transmission antenna unit 222 transmission unit 223 control signal generation unit 241 transmission signal replica generation unit 5 242 interference replica generation unit 243 subtractor 251,252 transmission frame formats 1000-1, 1000 -2 base station devices 2000-1, 2000-2, 200-3 mobile station devices. 121 receiving antenna unit 122 receiving unit 123 control signal detection unit 201 receiving antenna unit 202 receiving unit 203 channel estimation unit 204 GI removal unit 205 DFT unit 206 interference removal unit 207 channel compensation unit 208 demodulation unit 209 decoding unit 210 upper layer 211 control signal detection unit 221 transmission antenna unit 222 transmission unit 223 control signal generation unit 241 transmission signal replica unit 242 interference replica unit 243 subtractor 251,252 transmission frame formats 1000-1, 1000-2 base station devices 2000-1, 2000-2, 200-3 mobile station devices.
19168738v1 when the mobile station device connected to the pico cell is positioned in a cell border region of the pico cell, the transmission efficiency is mitigated due to macrocell interference (that is, intercellular interference). The mobile station device 200-2 in figure 22 is connected 5 by radio (as denoted by r21) to the base station device 1000-2 capable of receiving a signal with greater intensity from a received electric field, but a distance from the 2000-2 mobile station device for the 1000-1 base station device is short.
Therefore, the 2000-2 mobile station device suffers from Intercellular Interference, as denoted by 412, from the 1000-1 base station device with a signal transmitted from the 1000-1 base station device using the same resources.
As a result, a transmission throughput of the 2000-2 mobile station device is reduced, and the frequency utilization efficiency in the 1000-2 base station device is also reduced.
The present invention was created in view of the problem mentioned above and an objective of the present invention is to provide a base station device, a mobile station device, a communication system and a communication method that can mitigate or suppress in a way efficient intercellular interference in a radio communication system constituting a heterogeneous network.
Solution to the Problem (1) The present invention was created to solve the problem described above and in accordance with an aspect of the present invention, a base station device communicating with a mobile station device is provided, where the base station notifies, for the mobile station device, control information related to a cell-specific reference signal that is specific to a cell ID of another base station device other than the base station device mentioned above , the control information containing formation regarding the number of ports for the cell-specific reference signal. (2) A base station device in accordance with another aspect of the present invention is constituted so that, in the base station device in (1), a resource element developed in accordance with the cell ID is configured for the specific cell reference. (3) A base station device according to another aspect of the present invention is constituted so that, in the base station device 5 in (1), the control information related to the cell-specific reference signal additionally contains information regarding to a subframe on which the cell-specific reference signal is mapped. (4) A base station device according to another aspect of the present invention is constituted so that, in the base station device in (1), the control information related to the cell-specific reference signal contains energy information with relative to the cell-specific reference signal. (5) A base station device according to another aspect of the present invention is constituted so that, in the base station device in (1), the control information refers to the specific cell reference signal additionally contains information regarding whether or not a process is required for the cell-specific reference signal on the mobile station device. (6) A base station device according to another aspect of the present invention is constituted so that, in the base station device in (1), the control information related to the cell-specific reference signal is notified as specific information for the mobile station device. (7) In accordance with another aspect of the present invention, providing a mobile station device communicating with a base station device, where the mobile station device receives control information related to a signal from the base station device. cell-specific reference number that is specific to a cell ID of another base station device other than the base station device mentioned above, the control information containing information regarding the number of ports for the specific reference signal of cell. (8) A mobile station device according to another aspect
of the present invention is constituted so that, in the mobile station device in (7), the mobile station device executes, according to the control information related to the cell specific reference signal, a process for the cell-specific reference signal. (9) In accordance with a further aspect of the present invention, a communication system is provided in which a base station device and a mobile station device communicate with each other, where the base station device notifies, for the mobile station device, the control information related to a cell-specific reference signal that is specific to a cell ID of another base station device other than the base station device mentioned above, the control containing information regarding the number of ports for the cell-specific reference signal, and the mobile station device receives control information for the cell-specific reference signal from the base station device. (10) In accordance with another aspect of the present invention, a method of communication is provided for a base station device communicating with a mobile station device, the method of communication comprising the notification step, for the device mobile station, control information related to a cell-specific reference signal that is specific to a cell ID of another base station device other than the base station device mentioned above, the control information containing information pertaining to the number of ports for the cell-specific reference signal. (11) In accordance with another additional aspect of the present invention, a communication method is provided for a mobile station device communicating with a base station device, the communication method comprising the receiving step, from the base station device, control information related to a cell-specific reference signal that is specific to a cell ID of another base station device other than the base station device mentioned above, the control containing information regarding the number
number of ports for the cell-specific reference signal. (12) In accordance with another aspect of the present invention, a communication method is provided for a communication system in which a base station device and a mobile station device communicate with each other, the method of communication comprising the notification steps, from the base station device to the mobile station device, the control information related to a cell specific reference signal that is specific to a cell ID of another different base station device from the base station device mentioned above, the control information containing information regarding the number of ports for the cell-specific reference signal, and receiving, by the mobile station device from the base station device, the information control for the cell-specific reference signal. (13) In accordance with another aspect of the present invention, an integrated circuit is provided for a base station device communicating with a mobile station device, where the integrated circuit has a notify function for the device mobile station, control information related to a cell-specific reference signal that is specific to a cell ID of another base station device other than the base station device mentioned above, the control information containing referring information the number of ports of the cell-specific reference signal. (14). According to another aspect of the present invention, an integrated circuit is provided for a mobile station device communicating with a base station device, where the integrated circuit has a function to receive information from the base station device. control related to a cell-specific reference signal that is specific to a cell ID of another base station device other than the base station device mentioned above, the control information containing information regarding the number of ports for the reference signal cell specificity.
Advantageous Effects of the Invention According to the present invention, intercellular interference can be efficiently mitigated or suppressed in a radio communication system constituting a heterogeneous network. 5 Brief Description of the Drawings Figure 1 is a schematic view illustrating an example of a downlink in a radio communication system in which a plurality of base station devices having different cell radii are developed, according to a first modality of the present invention; Figure 2 is a schematic block diagram illustrating a configuration of the base station device in the radio communication system according to the first embodiment of the present invention; Figure 3 illustrates a transmission frame format for a downlink of a base station device 100-1 in the radio communication system according to the first embodiment of the present invention; Figure 4 is a conceptual view illustrating an example of a subframe format according to the modality.
The example illustrated in figure 4 represents an illustrative case where a base station device 100-α performs the transmission by the use of an antenna; Figure 5 is a conceptual view illustrating another example of the subframe format according to the first embodiment of the present invention; Figure 6 is a conceptual view illustrating another example of the subframe format according to the first embodiment of the present invention; Figure 7 illustrates a transmission frame format for a downlink of a base station device 100-2 in the radio communication system according to the first embodiment of the present invention;
Figure 8 is a transmission flowchart for the base station device 100-2 in the radio communication system according to the first embodiment of the present invention; Figure 9 is a schematic block diagram illustrating a configuration of a mobile station device 200-u in the radio communication system according to the first embodiment of the present invention; Figure 10 is a schematic view illustrating a configuration of an interference removal unit 206 in accordance with the first embodiment of the present invention; Fig. 11 is a reception flow chart for a mobile station device in the radio communication system according to the first embodiment of the present invention; Figure 12 illustrates the receipt of subframes by the mobile station device 200-2 subframes being transmitted from the base station device 100-1 and the base station device 100-2; Figure 13 illustrates a transmission frame format for a downlink of the base station device 100-1 in a radio communication system according to a second embodiment of the present invention; Fig. 14 illustrates an example of a downlink control signal according to a third embodiment of the present invention; Figure 15 illustrates an example of a downlink control signal for the base station device according to a fourth embodiment of the present invention; Figure 16 illustrates a modulation scheme and a rating rate with respect to an MCS information index; Figure 17 illustrates a subframe configuration with respect to a transmission format information index; Figure 18 illustrates an example of a need and no need decision table for a cancellation operation, which is maintained on a mobile station device according to the fourth mode.
of the present invention; Figure 19 is a flow chart with which the mobile station device in a radio communication system according to the fourth mode of the present invention determines the property of the operation of the canceller; Figure 20 is a sequence diagram illustrating the connection between the base station device and the mobile station device and a control process flow in the radio communication system according to the present invention; Figure 21 is a flow chart illustrating the generation of feedback information in a fifth embodiment of the present invention; Fig. 22 is a schematic view illustrating an example of a downlink in a radio communication system in which base station devices having different cell radii are developed.
Description of the Modalities A radio communication system according to each of the modalities described later in the present invention includes a plurality of base station devices (also called transmission devices, cells, transmission points, transmitting antenna groups, transmitting antenna port groups, component carriers, or eNodeB) and a plurality of mobile station devices (also called terminals, terminal devices, mobile terminals, receiving points, receiving terminals, receiving devices, group - receiving antenna posts, receiving antenna port groups or UE (User Equipment)). Individual base station devices can have different transmit energies.
The modalities described later of the present invention can be applied to the transmission of multiple carriers and single carrier transmission, including IFDM (Orthogonal Frequency Division Multiplexing), MC-CDMA (Multiple Access Code Division Multiple Access), SC-FDMA (Multiple Access by Port Frequency Division
Single Tador), DFT-s-OFDM (Discrete Fourier Transformation scattering OFDM), and so on.
The following description is made in relation to the case in which the OFDM transmission (Orthogonal Frequency Division Multiplexing) is applied to a downlink in the radio communication system.
On an uplink, the transmission method can be of any type as long as the base station device can recognize the control signals from the mobile station device.
First Mode A first mode of the present invention will be described below.
Figure 1 is a schematic view illustrating an example of a downlink in a radio communication system where a plurality of base station devices having different cell rays are developed, according to a first embodiment of the present invention.
A base station device 100-2 is developed with single-cell frequency reuse so that a cell 100-2a (for example, a peak cell or first base station device) from the base station device 100-2 superimposes a cell 100-1a (macrocell or a second base station device) on a 100-1 base station device. The individual base station devices are interconnected via a return access 10 channel connection (for example, an X2 interface) using an optical fiber, an Internet connection, or a radio connection, for example.
A mobile station device 200-1 is connected by radio (as denoted by r11) with the base station device 100-1, and mobile station devices 200-2 and 200-3 are connected by radio with the device base station 100-2 (as denoted by r21 and r23 respectively). Signals for LTE downlink include, for example, a Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), a Synchronization Signal.
(SS), a Physical Diffusion Channel (PBCH), a Cell Specific Reference Signal (CRS), a Channel State Information Reference Signal (CSI-RS), a Demodulation Reference Signal ( DMRS), a radio location signal (Paging), a System Information Block 5 (SIB). The Shared Physical Downlink Channel is a channel for transmitting information data, etc.
The Physical Downlink Control Channel implies a control signal for notification, to the mobile station device, of an encoding rate and a modulation level (called MCS; Modulation and Encoding Scheme) applied to the data of Physical Downlink Shared Channel (PDSCH) information, the number of layers (number of classifications or number of spatial multiplexing), programming information (resource designation information), and so on.
The Synchronization Signal is a signal that allows the mobile station device to establish and follow an automatic search, frame synchronization, and symbol synchronization.
Examples of Sync Signal include a Primary Sync Signal (PSS) and a Secondary Sync Signal (SSS). The PSS is a data stream capable of detecting not only symbol timing, but also a cell ID, and is, for example, an orthogonal stream, such as a Zadoff-Chu stream.
The term "cell ID" implies an assigned ID for each of the cells corresponding to the base station devices (transmitting devices 10). The cell ID is used by the mobile station device (receiver device 200) to identify the cell, that is, the base station device (transmission device 100). SSS is a data stream capable of detecting frame timing, and is, for example, an M sequence.
The Cell-specific Reference Signal is a known signal for measuring the channel states of the base station device and the mobile station device.
The mobile station device measures, for example, Energy Received from Reference Signal (RSRP) in the relevant cell used
using the Cell-specific Reference Signal and notifies a measured result to the base station device.
By using the measured result of the Received Reference Signal Energy, the base station device can perform not only the selection of a cell to which the relevant mobile station device 5 must be connected, but also the transfer to the cell. selected cell.
The Channel State Information Reference Signal is a known signal for measuring the channel states of the base station device and the mobile station device, and is used to generate feedback information that is transmitted from the mobile station device to the base station device.
The feedback information includes CQI (Channel Quality Indicator), PMI (Pre-coding Matrix Index), RI (Classification Indicator), and so on.
CQI implies the information generated in consideration of a channel estimate result, etc., which was estimated with the Channel State information Reference Signal, and indicates the encoding rate and modulation scheme with which the station device can maintain the prescribed reception quality.
PMI implies information generated considering a result of channel estimation, etc., which has been estimated with the Channel Status Information Reference Signal and indicates a suitable pre-coding matrix for the mobile station device.
IR implies information generated considering a channel estimate result, etc., which was estimated with the Channel State Information Reference Signal, and indicates the number of layers suitable for the mobile station device.
The Demodulation Reference Signal is a signal to measure the channel states of the base station device and the mobile station device, and is used to demodulate a shared downlink channel, for example.
The paging signal (Paging) is used to perform call control.
SIB implies system information transmitted on a downlink.
The Physical Diffusion Channel (PBCH) is an information channel about the entire cell for system control.
Figure 2 is a schematic block diagram illustrating a configuration of the base station device in the radio communication system according to the first embodiment of the present invention.
The base station device 100-α (α = 1, 2) includes an upper layer 102, a symbol generation unit 103-u (u denotes the number of mobile station devices connected to the station device base), a control signal generation unit 104, a reference signal generation unit 105, a resource mapping unit 106, an IDFT 107 unit, a GI insertion unit 108, and a transmission unit 109 An NT number of transmit antenna units 101-n (n = 1, ..., NT) is connected to the transmit unit 109. The base station device 100-α additionally includes a receive unit 122 and a control signal detection unit 123. A receiving antenna unit 121 is connected to the receiving unit 122. When the base station device 100-α is partially or fully constituted as an integrated circuit in the form of a chip , a chip control unit (not shown) for performing block control individual functional functions is also arranged.
The base station device 100-α receives, via the receiving antenna unit 121, signals containing a control signal and transmitted from the mobile station device 200-u via uplink.
The receiving unit 122 performs (i) downward conversion of the control signal, etc. for a frequency band where digital signal processing, such as the signal detection process is executable, (ii) a filtering process to remove the spurious and (iii) converting a signal, which has been subjected to the filtering process , from an analog signal to a digital signal (that is, conversion from analog to digital). The control signal detection unit 123 performs a demodulation process, a decoding process, etc. in the control signals sent from the receiving unit 122. The control signal is detected from, for example, a Physical Uplink Control Channel (PUCCH) and / or a Physical Uplink Shared Channel ( PUSCH). The upper layer 102 obtains continuous feedback information
control signal that is recorded from the control signal detection unit 123. The upper layer 102 sends information data to the symbol generation unit 103-u according to the feedback information, 5 and additionally sends control data to the control signal generation unit 104. Here, the term "upper layer" implies the communication function layers defined in the OSI reference model, which has functions at levels higher than the Layer Physical and which include, for example, a data connection layer and a network layer.
In addition, the base station device performs the programming of data modulation symbols, control signals, reference signals, etc. for each mobile station device according to the feedback information, and then sends them to the resource mapping unit 106 according to the programming information.
Here, the term "programming information" implies information referring to a resource element or a resource block on which data modulation symbols, control signals, and reference signals are selectively mapped.
The term "resource element" implies a minimum unit in which a signal made from a sub-carrier and an OFDM symbol is mapped.
The term "resource block" implies a resource unit including a plurality of resource elements together, and is a minimum resource unit designated for each mobile station device.
For example, the resource block can be provided as resources including 12 subcarriers and 7 OFDM symbols.
In addition, the upper layer 102 notifies, to a higher layer of another base station device (for example, an adjacent base station or a macrocell or peak cell in a heterogeneous network), information related to the link transmission. downlink of the relevant base station device via the return access channel connection 10 shown in figure 1. The information related to downlink transmission includes information of a downlink subframe format described later.
Information related to downlink transmission additionally includes, for example, information regarding the layout of Normal Subframes and subframes limited to resource mapping, cell ID, number of CRS ports, etc. The upper layer 102 additionally notifies other parameters that are necessary for the various components of the base station device 100-α to develop its functions. The 103-u symbol generation unit generates data modulation symbols from the information data record from the upper layer 102. The data modulation symbols correspond, for example, to the shared channel of downlink, etc. The 103-u symbol generation unit includes a coding unit 111 and a modulation unit 112. The coding unit 111 performs an error correction coding process (using a turbo code, a convoluted code, a Low Density Parity Check (LDPC) code, or similar) in the information data, and sends encrypted bits. It should be noted that, at the top layer, the information data is preferably subjected to error detection coding, such as the Cyclic Redundancy Check (CRC), to detect errors on the receiving side. In addition, the encoding unit 111 may include a rate combining processing unit to make the encoding rate match a data transmission rate. The rate combining processing unit performs, for example, a data part elimination drilling process, a part data repeat repetition process or a partial insertion fill process temporary data (for example, value equal to zero). Additionally, the encoding unit 111 can interleave the generated encoded bits and can send the interleaved encoded bits to the modulation unit
112. The modulation unit 112 performs the modulation mapping of the coded bits registered from the coding unit 111 and generates data modulation symbols. A modulation process performed
cut by modulation unit 112, is, for example, BPSK (Binary Phase Shift Switching), QPSK (Quadrature Phase Shift Switching), 16QAM (16 Quadrature Amplitude Modulation), or 64QAM ( Quadrature Amplitude 64). The modulation unit 112 sends the generated data modulation symbols to the resource mapping unit 106. The modulation unit 112 can interleave the generated data modulation symbols and can send the symbols data modulation module for resource mapping unit 106. In addition, modulation unit 112 can perform the pre-coding of the generated data modulation symbols and can send the data modulation symbols, having been subjected to pre- coding for the resource mapping unit 106. The control signal generation unit 104 performs error correction coding and demodulation mapping of the control data sent from the upper layer 102, thus generating the control signals.
The control signals correspond to the Physical Downlink Control Channel (PDCCH), Physical Broadcast Channel (PBCH), Synchronization Signal (PSS, SSS), radio location signal (Paging), SIB-1, etc.
Control signals can be subjected to pre-coding.
In the first embodiment of the present invention, the control signals include information indicating the need for cancellation on the mobile station device and a cell for which the cancellation is to be performed (as described in detail later). The reference signal generation unit 105 generates reference signals (pilot signals) with which the respective channels of the base station device and the mobile station device can be estimated.
The reference signals correspond to the Cell Specific Reference Signal (CRS), the Channel State Information Reference Signal (CSI-RS), etc.
A code sequence constituting each reference signal is preferably an orthogonal sequence, such as a Hardamard code or a CAZAC sequence (Constant Zero Amplitude Correlation). Although not illustrated, the Demodulation Reference Sign (DM-
RS) is multiplexed with the data modulation symbols, which are in a state before being pre-coded in modulation unit 112. The resource mapping unit 106 performs the mapping of the modulation symbols data, control signals and reference signals for the resource elements (such mapping being referred to as "resource mapping" hereinafter) according to the programming information notified from the top layer 102. The programming information implies the information indicating arrangement of individual signals according to a transmission frame format described later, for example.
The IDFT 107 unit performs the Inverted Discrete Fourier Transformation (IDFT) on a frequency domain signal that is sent from the resource mapping unit 106, thereby converting the frequency domain signal to a time domain signal.
The IDFT 107 unit sends the time domain signal converted to GI 108 insertion unit. While the IDFT 107 unit performs the function of converting the frequency domain signal to the time domain signal, the function of the IDFT 107 unit is not limited to such conversion.
For example, the IDFT 107 unit can perform Fast Inverted Fourier Transformation (IFFT). The GI insertion unit 108 generates an OFDM symbol by adding a GI to the registered time domain signal from the IDFT 107 unit. The GI insertion unit 108 configures the registered time domain signal as an effective symbol and pre-sets a part of the last half of it, as a GI, to the effective symbol.
The actual symbol added to the IM is the OFDM symbol.
The GI insertion unit 108 sends the generated OFDM symbol to the transmission unit 109. By using the generated OFDM symbol in this way, the mobile station device 200-u can remove the distortion that is caused by a delay path having a delay time shorter than a GI length.
In LTE, for example, the length GI, that is, the number of sample points, is equal to 144 (6.7 µs).
A signal st (t) of a first OFDM symbol sent from the GI 108 insertion unit is expressed by the following formula: Mathematics 1
In the above formula, 1Ts ≤ t <(+ 1) Ts is satisfied and Ts denotes a 5 OFDM signal length (Ts = Tf + TG). Tf denotes an FFT interval length.
TG denotes a GI length.
Nf denotes the number of IDFT points.
Ck, denotes a data modulation symbol, a control signal, or a reference signal mapped to a subcarrier k of a first OFDM symbol. ∆f denotes a subcarrier range.
In LTE, for example, Nf is 2048 and ∆f is 15 kHz.
The transmission unit 109 performs the D / A conversion (digital to analog) of the OFDM symbol registered from the GI insertion unit 108 to generate an analog signal, and additionally generates a band-limited signal by limiting one band of the analog signal generated with a filtering process.
Transmission unit 109 converts the generated limited band signal upstream to a radio frequency band to generate a carrier band OFDM and transmits the generated carrier band OFDM signal in the form of an electrical wave to for the mobile station device 200-u from the transmission antenna unit 101-n.
In the 100-α base station device, the transmission of a plurality of transmission antennas can be carried out as Diversity transmission or MIMO transmission (multiple inputs and multiple outputs). Figure 3 illustrates a transmission frame format for a downlink of the base station device 100-1 in the radio communication system according to the first embodiment of the present invention.
The table is made up of ten plural types of subframes including Normal Subframes and limited subframes by resource mapping (hereinafter also referred to as "limited subframes"). An example of subframes limited by resource mapping is MBSFN
are / Diffusion through Singular Frequency Network) or ABS (Almost Blank Subframe). The term "Normal Subframes" implies a subframe for which the resource mapping of information data, control data, 5 and reference signals, each transmitted from the base station device 100-1, according to Programming information described above is allowed.
For example, the Physical Downlink Shared Channel, the Physical Downlink Control Channel, the Synchronization Signal, the Physical Broadcast Channel, Cell-specific Reference Signal, the State Information Reference Signal Channel, paging signal, SIB-1, etc. can be mapped to the Normal Subframe by resource mapping.
On the other hand, the term "resource mapping limited subframe" implies a subframe for which the resource mapping is limited to predetermined signals transmitted from the base station device 100-1. In this modality, the MBSFN or ABS subframe is used as a subframe limited by resource mapping.
The MBSFN subframe is a subframe that is prepared to send a broadcast signal or a multicast signal.
The MBSFN subframe does not transmit the Cell-specific Reference signal (CRS) that is configured per cell in a data area (PDSCH), in anticipation of the simultaneous transmission of data from multiple cells.
Therefore, the mobile station device 200-u does not measure CRS in the MBSFN subframe.
Accordingly, the base station device 100-1 can stop the transmission of the information data without being recognized by the mobile station device 200-u.
In the MBSFN subframe, for example, PDCCH and CRS in a PDCCH area are transmitted, but other data areas and CRSs in those data areas are not transmitted.
ABS is a subframe capable of transmitting only the Synchronization Signal, the Physical Diffusion Channel, the Cell-specific Reference Signal, the Channel State Information Reference Signal, the paging signal, and SIB-1. In other words, the resource mapping of the Physical Downlink Shared Channel and the Physical Downlink Control Channel is limited.
In such a subframe, only CRS in the PDCCH area is transmitted, while PDCCH, the data area, and CRS in the data area are not transmitted.
The term "multicast" implies the transmission of the same information data signal to a defined number of mobile station devices, and the term "diffusion" implies transmission of the same information data signal to an indefinite number. of mobile station devices.
The frame format of figure 3 represents an example in which the first, second, sixth and seventh subframes (double dashed lines) are configured as resource framed limited frames and other (empty) frames are configured as the Normal Subframes.
In addition, among the subframes limited by resource mapping in the illustrated example, the second and seventh subframes are configured as MBSFN subframes, and the first and sixth subframes are configured as ABSs.
The configuration (reason) of the Normal Subframes and the subframes limited by resource mapping in a transmission frame can be made exchangeable depending, for example, on the number of mobile station devices to which each base station device is connected.
Additionally, an index for a subframe to which the resource mapping-limited subframe should be allocated can be specified in advance using a table, for example, depending on the ratio of Normal Subframes and subframes limited by resource mapping.
A subframe is made up of 14 OFDM symbols.
Figure 3 illustrates an example of resource mapping in which, as a Synchronization Signal, SSS is mapped to the sixth OFDM symbol (that is, a part dashed by rising lines in the left direction), and PSS is mapped for the seventh OFDM symbol (that is, a part dashed by rising lines in the right direction). Additionally, these Synchronization Signals are mapped to the first subframe and the sixth subframe by the resource mapping.
The downlink transmission frame format of the base station device 100-1, shown in Figure 3, can be configured in units of 40 subframes.
The base station device 100-1 notifies the configured information regarding the forward link frame format from the base station device 100-1 (that is, the forward frame format information) to the forwarding device. base station 100-2 via return access channel connection 10. For example, the transmission frame format information may be information in the 40-bit bit map format with the Normal Subframe denoted by "1" and the subframe limited by resource mapping named "0". In addition, the transmission frame format information allows the addition or change of information indicating that the base station device 100-1 recommends that the base station device 100-2 limit the RLM measurement Radio) / RPM (Radio Resource Management) Figure 4 is a conceptual view illustrating an example of a subframe format according to the first embodiment of the present invention.
The example shown in figure 4 represents an illustrative case in which the base station device 100-α carries out the transmission using an antenna port.
In figure 4, the horizontal direction represents time, and the vertical direction represents frequency.
Figure 4 illustrates a format for each of the first and sixth subframes in figure 3. PSS corresponds to the seventh OFDM symbol, and is mapped into feature elements (that is, parts dashed by rising lines in the right direction), which they are made up of 63 intermediate subcarriers (frequency bands) in a system band.
SSS corresponds to the sixth OFDM symbol, and is mapped into resource elements (that is, parts dashed by ascending lines to the left), which are made up of 63 intermediate subcarriers (frequency bands) in the system band.
The data modulation symbols and the reference signals are mapped in units of a pair of resource blocks (denoted by thick lines), which are made up of two resource blocks.
Each pair of resource blocks is created from 168 resource elements that occupy frequencies indicated by 12 subcarriers and times indicated by 14 OFDM symbols.
Control signals, such as PDCCH, are basically mapped in one to three areas at the beginning of the 14 OFDM 5 symbols making up the pair of resource blocks.
The eleven to thirteen remaining areas of the OFDM symbols are areas where data modulation symbols, such as PDSCH, are basically mapped.
The Cell-specific Reference Sign is mapped to the predetermined elements among the resource elements (that is, filled parts) constituting each resource block.
It should be noted that the resource element on which the Cell-specific Reference Signal is mapped is cyclically changed in the frequency direction depending on the cell ID of the 100-α base station device.
Using the subframe format illustrated in figure 4, the base station device 100-1 performs programming for the mobile station device 200-1 to perform the resource mapping of the PDSCH and PDCCH for only the Normal Frames, taking into account resource information.
Thus, when the resource mapping unit 106 performs the resource mapping according to the programming information, the base station device 100-1 can transmit PDS-CH and PDCCH to the mobile station device 200-1 by employing only the Normal Tables.
On the other hand, in the subframe limited by resource mapping, an empty part where PDCCH, for example, is mapped by the resource mapping can be configured so that any signal is not mapped here.
As a result of this, intercept interference with the mobile station device connected to the base station device 100-2 can be mitigated in the subframe limited by resource mapping.
Figure 5 is a conceptual view illustrating another example of the subframe format according to the first embodiment of the present invention.
The example shown in figure 5 represents an illustrative case where the base station device 100-α performs the transmission using two antennas (antenna ports). In figure 5, the horizontal direction represents time, and the vertical direction represents frequency.
The Cell-specific Reference Sign is mapped into predetermined elements (that is, filled parts) of the resource elements that make up each resource block 5.
In figure 5, the reference signal transmitted from one of the two antennas is mapped to a resource element 0 by the resource mapping.
The Cell-specific Reference Signal transmitted from another of the two antennas is mapped to a resource element 1 by the resource mapping.
The subframe format for the 100-α base station device is provided by the resource block arrangement of figure 5 in place of the resource block in the subframe format of figure 4. Figure 6 is a conceptual view illustrating another example of the subframe format according to this modality.
The example illustrated in figure 6 represents an illustrative case where the base station device 100-α performs the transmission using four antennas.
In figure 6, the horizontal direction represents time, and the vertical direction represents frequency.
The Cell-specific Reference Sign is mapped into predetermined elements (that is, filled parts) of the resource elements constituting each resource block.
In figure 6, the Cell-specific Reference Signal transmitted from one of the four antennas is mapped to a resource element 0 by the resource mapping.
The Cell-specific Reference Signal transmitted from one of the four antennas is mapped to a resource element 1 by the resource mapping.
The Cell-specific Reference Signal transmitted from another of the four antennas is mapped to a resource element 2 by the resource mapping.
The Cell-specific Reference Signal transmitted from another of the four antennas is mapped to a resource element 3 by the resource mapping.
The subframe format for the 100-α base station device is provided by the arrangement of the resource block of figure 6 in place of the resource block in the subframe format of figure 4. As described above, the number of reference signals is increased and reduced depending on the number of transmitting antennas and the number of
on the 100-α base station device.
Figure 7 illustrates a transmission frame format for a downlink of the base station device 100-2 in the radio communication system according to the first embodiment of the present invention.
A table is made up of ten Normal Subframes.
One format of each subframe is similar to the format shown in figure 4 except that the position where the Cell-specific Reference Signal is mapped is cyclically changed depending on the cell ID.
The base station device 100-2 performs resource mapping of PDSCH, PDCCH, etc. by using not only the feedback information obtained from the mobile station device 200-2 and the mobile station device 200-3, but also control data (such as transmission frame format information, ID number, and number of CRS ports) downlink from the base station device 100-2, control data being obtained through the return access channel connection 10. For example, the base station device 100-2 performs preferably the resource mapping of PDSCH and PDCCH, both transmitted to a mobile station device, for example, the mobile station device 200-2, which is estimated to receive relatively strong interference from the base station device 100-1, for any of the subframes (i.e., double dashed parts in figure 7) transmitted from the base station device 100-2 at the same time as the base station device 100-1 transmits subframes limited by mapping of re- course.
In addition, the base station device 100-2 can perform resource mapping of the PDSCH and PDCCH, both transmitted to a mobile station device, for example, the mobile station device 200-3, which is estimated to receive relatively weak interference from the base station device 100-1 to any of the subframes (that is, double dashed parts in figure 7) transmitted from the base station device 100-2 at the same time as all subframes, including the subframes limited by resource mapping, transmitted to
from the 100-1 base station device. In another example, the base station device 100-2 performs resource mapping of PDSCH and PDC-CH, both transmitted to the mobile station device 200-2 and the mobile station device 200-3 to any of the subframes (that is, 5 double dashed parts in figure 7) that are configured as subframes limited to resource mapping by the base station device 100-1, and do not perform resource mapping for other subframes.
By carrying out such programming, the Intercellular Interference received from the signal transmitted by the base station device 100-1 can be mitigated in the mobile station device connected to the base station device 100-2. When the mobile station device is mapped to a transmitted subframe at the same time as ABS between resource mapping-limited subframes configured by the base station device 100-1, CRS of the base station device 1001 causes interference in the relevant mobile station device.
In such a case, the relevant mobile station device preferably performs a CRS cancellation process from the base station device 100-1. Additionally, when the mobile station device is mapped to a transmitted subframe at the same time as the Normal Subframe set by the base station device 100-1, CRS of the base station device 100-1 causes interference on the relevant mobile station device.
In such a case, the relevant mobile station device preferably performs a CRS cancellation process from the base station device 100-1. When the mobile station device is mapped to a transmitted subframe at the same time as the MBSFN subframe between the resource mapping bounded subframes determined by the base station device 100-1, CRS of the base station device 100-1 does not cause any relevant mobile station device interference.
In such a case, the relevant mobile station device preferably does not perform a CRS cancellation process from the base station device 100-1. To solve the problems mentioned above, in the first embodiment of the present invention, the information related to an interference cancellation process for CRS from the base station device 100-1 (i.e., interference cancellation information) is contained on a downlink control signal for the mobile station device connected to the base station device 100-2. The control signal is, for example, PDCCH or RRC (Radio Resource Control) signaling. RRC signaling is a control signal that is contained in PB-CH or PDSCH.
In comparison with PDCCH, RRC signaling has a greater amount of transmissible information and is semi-static with a lower update (transmission) frequency. When the mobile station device receives a notification indicating the need for an interference cancellation process, the mobile station device performs a Intercellular Interference cancellation process for a predetermined period after receiving the notification (details of the cancellation process interference on the mobile station device will be described below). In one example, the base station device 100-2 prepares, in the PDCCH or RRC signaling, a 1-bit area to indicate the information regarding the necessity or not of the interference cancellation, and notifies the cancellation process by the configuration "0" in the relevant area and the need for the cancellation process by setting "1" in the relevant area.
In more detail, when the need for the cancellation process is configured using PDCCH, the mobile station device performs the CRS cancellation process, transmitted from the base station device 100-1, in PDSCH this is programmed (map - do) for the relevant subframe.
When the need for a cancellation process is configured using RRC signaling, the mobile station device performs, until the interference cancellation information is updated, the CRS cancellation process, transmitted from the station device base 100-1 PDSCH that is programmed (mapped) for a period until the interference cancellation information is updated.
Whether or not there is a need to cancel interference is determined, for example, based on the determination criteria described below.
When transmitting information data to the mobile station device using a subframe corresponding to the ABS between the subframes limited by resource mapping determined by the base station device 100-1, or a subframe corresponding to the Normal Subframe, the base station device 100-2 notifies the information indicating the need for cancellation.
On the other hand, when transmitting information data to the mobile station device using a subframe corresponding to the MBSFN subframe between the resource mapping-limited subframes configured by the base station device 100-1, the device base station 100-2 notifies the information indicating no cancellation is required.
In another example, the base station device 100-2 transmits information data to the mobile station device by employing a subframe corresponding to ABS between the resource mapping-limited subframes determined by the base station device 100-1, or a subframe corresponding to the Normal Subframe, and additionally notify the information indicating the need for cancellation when MCS of the transmitted information data is not less than a predetermined level.
In another additional example, when the base station device 100-1 transmits the Cell Specific Reference Signal in a number not less than a predetermined value by using a subframe corresponding to ABS between the subframes limited by mapping of resource or a subframe corresponding to the Normal Subframe, the base station device 100-2 notifies the information indicating the need for cancellation.
In another additional example, the need for cancellation is determined in the radio communication system based on a transmission frame format mode.
More specifically, when the base station device 100-1 transmits a signal in a transmission frame format mode including the resource mapping-limited subframe, the base station device 100-2 notifies
training indicating the need for cancellation.
It should be noted that the number of reference signals mentioned above and the transmission frame format mode can be shared by the base station devices via the return 10 access channel connection. 5 The determination criteria described above they can be applied only to a mobile station device for which the base station device 100-2 estimates the interference caused by the CRS transmitted from the base station device 100-1 as being strong.
In other words, the base station device 100-2 can notify the information indicating that there is no need for cancellation without applying the determination criteria described above for a mobile station device for which the interference caused by the CRS transmitted to from the base station device 100-1 is estimated as weak.
Additionally, in the first embodiment of the present invention, the cell information to perform the interference cancellation process is contained in a downlink control signal.
The control signal is, for example, PDCCH or RRC (Radio Resource Control) signaling. The cell information corresponds to the cell ID, the number of CRS ports, CRS energy information (including an energy ratio with respect to a data signal, etc.), and so on.
In one example, the base station device 100-2 prepares, in the PDCCH, an area to indicate the cell information to perform interference cancellation processing, and notifies the cell information of the transmission source to the signal in the which the cancellation process should be performed.
In another example, the base station device 100-2 prepares, in the RRC signaling, an area for the indication of the cell information for the execution of the interference cancellation process, and previously notifies the cell information referring to the source of interference. signal transmission where the cancellation process is to be performed.
In figure 1, the base station device 100-2 notifies the cell ID, the number of CRS ports, the CRS power information, etc. from the base station device 100-1 to the mobile station device 200-2 and / or the mobile station device 200-3 using a control signal.
Based on the cell ID and the number of CRS ports notified, the mobile station device can specify or estimate the resource element to which the relevant base station device has mapped the CRS by resource mapping, and a CRS value.
As a result, the mobile station device can perform the Cell-specific Reference Signal (CRS) cancellation process. RRC signaling can be transmitted with PBCH or PDSCH.
When the notification of the information indicating the necessity or not of the interference cancellation process or the cell information for executing the interference cancellation process with the downlink control signal by using RRC signaling transmitted with PBCH, the device base station 100-2 can notify the information mentioned above as Cell Specific information.
In addition, when the notification of information indicating the necessity or not of the interference cancellation process or cell information for the execution of the interference cancellation process with the downlink control signal by using RRC signaling transmitted with PDSCH , the base station device 100-2 can notify the information mentioned above as specific UE (User Equipment) information. Figure 8 is a transmission flowchart for the base station device 100-2 in the radio communication system according to the first embodiment of the present invention.
The base station device 100-2 obtains information regarding downlink transmission from an adjacent base station device (i.e., the base station device 100-1) through the return access channel connection 10 (S101). The information related to downlink transmission includes information regarding the transmission frame format.
Next, the base station device 100-2 determines, based on information related to downlink transmission,
whether or not the subframe transmitted from the base station device 100-1 is MBSFN (S102). If it is determined that the relevant subframe is not MBSFN (not in S101), the base station device 100-2 generates a control signal to notify the need for the cancellation process for the mobile station device 200-u (u = 2 and / or 3 in the case of figure 1) (S104). On the other hand, if the relevant subframe is determined to be MBSFN (YES in S101), the base station device 100-2 generates a control signal to notify you that the cancellation process is not required for the mobile station device 200-u (u = 2 and / or 3 in the case of figure 1) (S103). Thereafter, the base station device 100-2 transmits the control signal and a data signal (e.g., PDSCH) to the mobile station device (S105), and terminates processing.
It should be noted that the control signal transmitted to the mobile station device can include cell information, the number of CRS ports, and other information.
The configuration of the mobile station device according to the first embodiment of the present invention will be described below.
Figure 9 is a schematic block diagram illustrating the configuration of the mobile station device 200-u (u = 1 to 3 in figure 1) in the radio communication system according to the first embodiment of the present invention.
The mobile station device 200-u includes a receiving antenna unit 201, a receiving unit 202, a channel estimating unit 203, a GI removal unit 204, a DFT unit 205, a unit interference removal 206, a channel compensation unit 207, a demodulation unit 208, a decoding unit 209, an upper layer 210, a control signal detection unit 211, a transmitting antenna unit are 221, a control signal generation unit 222, and a transmission unit 223. The receiving antenna unit 201 receives an OFDM signal in a carrier band, which is transmitted in the form of an electrical wave from the base station 100-2, and sends the OFDM signal received on the carrier band to the receiving unit 202. At that time, the receiving antenna unit 201 additionally receives an OFDM signal on the carrier band, which is transmitted from the base station device 100-1 causand o, thus, Intercellular Interference. The receiving unit 202 downwardly converts the OFDM signal, the recording from the receiving antenna unit 202 into a frequency band where digital signal processing is executable, and additionally performs a filtering process of the downwardly converted signal to remove the unnecessary (spurious) component. In addition, the receiving unit 202 performs the conversion (A / D: analog to digital) of the signal, which has been subjected to the filtering process, from an analog signal to a digital signal, and sends the digital signal converted to the channel estimation unit 203, the GI removal unit 204, and the control signal detection unit 211. The channel estimation unit 203 performs the channel estimation by using a reference signal contained in the signal sent from the receiving unit 202, thereby generating a channel estimate value.
Then, the channel estimation unit 203 notifies the channel estimate value for the interference removal unit 206, the channel compensation unit 207 and the upper layer 210. The channel estimate value is provided as a transfer function or impulse response, for example.
The control signal detection unit 211 detects the control signal (for example, PDCCH or RRC signaling) that is contained in the signal sent from the receiving unit 202. In addition, the control signal detection unit 211 extracts information regarding the MCS, the pre-coding matrix, and the number of cameras, which are applied to the information data, etc. contained in the control signal, and notifies the information extracted for the demodulation unit 208 and the decoding unit 209. Additionally, the control signal detection unit 211 extracts the information indicating whether or not the process cancellation on the mobile station device and cell information of the signal transmission source where the cancellation process is to be performed, such information being contained in the control signal, and notifies the extracted information to the interference removal unit 206. The GI removal unit 204 removes GI from the signal sent at 5 from the receiving unit 202, and sends the signal after GI removal to the DFT unit 205. The DFT unit 205 performs Discrete Fourier Transformation (DFT) of the signal , which is registered from the GI removal unit 204 and from which the GI was removed, for conversion of a time domain signal to a frequency domain signal, and sends the frequency domain signal uence converted to interference removal unit 206. The conversion method performed on the DFT unit 205 is not limited to DFT since the DFT unit 205 can convert a signal from a time domain to a frequency domain.
For example, the DFT 205 unit can perform Fast Fourier Transformation (FFT), etc.
The interference removal unit 206 performs a process of removing an interference component from the signal registered from the DFT unit 205, (i) based on the information indicating the need or not of the interference process. cancellation on the mobile station device and / or cell information of the signal transmission source on which the interference cancellation process is to be performed or (ii) by using the channel estimate value recorded from the channel estimation unit 203. More specifically, the interference removal unit 206 removes the known signal, for example, CRS, which is transmitted from the base station device corresponding to the notified cell ID, from the domain signal. frequency recorded from the DFT 205 unit (as described in detail later). The channel compensation unit 207 calculates a weight coefficient to compensate for a channel distortion attributable to the fade, for example, based on the channel compensation value recorded from the channel estimation unit 203 using ZF equalization. (zero force), MMSE equalization (minimum mean square error), or another suitable method.
The channel compensation unit 207 multiplies the recorded frequency domain signal from the interference removal unit 206 by the calculated weight coefficient, thereby executing the channel compensation. 5 Demodulation unit 208 performs a demodulation process on a signal (data modulation symbol) after channel compensation, the signal being recorded from channel compensation unit 207. The demodulation can be performed with a difficult decision (calculation of a coded bit string) or easy decision (calculation of the LLR code bit). The decoding unit 209 calculates the information data, transmitted to be sent to the relevant mobile station device, by executing an error correction decoding process in the coded bit stream (or coded bit LLR) after demodulation. - tion, which is sent from the demodulation unit 208, and sends the calculated information data to the upper layer 210. A method used in the error correction decoding process, for example, turbo coding or coding convolute, which was performed on the transmission device 100 as a transmission source.
The error correction coding process can be performed with a difficult decision or an easy decision.
When the base station device transmits the interleaved data modulation symbols, the decoding unit 209 performs, before the error correction decoding process, an input coded bit sequence deinterleaving process corresponding to the interleaving on the base station device.
The decoding unit 209 then performs the error correction decoding process on the signal that has been subjected to the deinterleaving process.
The control signal generation unit 222 generates a control signal for the transmission of feedback information (including CQI, RI and PMI) to the base station device.
The return information is determined by the upper layer 210 based on the channel estimate value calculated by the channel estimate unit 203.
The control signal generation unit 222 generates the control signal by executing the error correction coding and modulation mapping in control data that represent the feedback information.
The control signal corresponds, for example, to PUCCH.
Signals containing the control signal sent from the control signal generation unit 222 are converted upwardly by the transmission unit 223 to a downlink transmissible frequency band, and are transmitted to the base station device via the transmission antenna unit 221. The configuration and function of the interference removal unit 206 according to the first embodiment will be described below.
Figure 10 is a schematic view illustrating the configuration of the interference removal unit 206 according to the first model.
The interference removal unit 206 includes a transmit signal replica generation unit 241, an interference replica generation unit 242 and a subtractor 243. When the control signal indicating the need for the cancellation process is recorded, the signal replica generation unit 241 generates a replica (replica of the transmission signal) of known signals, such as the reference signal (for example, CRS) and the control signal.
The transmission signal replica is generated based on the "cell information of the signal transmission source on which the cancellation process is to be carried out", which is contained in the relevant control signal.
In figure 1, upon receipt, from the base station device 100-2, notification of the information indicating the need for a cancellation process and the cell information from the base station device 100-1 as the signal transmission source. in which the cancellation process must be performed, the mobile station device 200-2 and / or the mobile station device 200-3 generate a replica of the known signals (such as CRS, PSS and SSS) according to with the transmission frame format (figures 3 and 4) for downlink of the base station device 100-1. In particular, the mobile station device 200-2 and / or the device
positive mobile station 200-3 generate a replica of the known signal in the subframe limited by resource mapping.
The interference replica generation unit 242 multiplies the transmission signal replica by the channel estimate value, thereby generating an interference replica.
Subtractor 243 subtracts the generated interference replica from the frequency domain signal sent from the DFT unit 205, and then sends the frequency domain output after subtraction to channel compensation unit 207. A signal at the subcarrier k of the first OFDM symbol sent from subtractor 243 is expressed by the following formula.
Mathematics 2
In the formula above, it denotes a signal in subcarrier k of the first OFDM symbol in the frame limited by resource mapping sent from the DFT 205 unit. It denotes an interference replica in the frame limited by resource mapping, and is expressed by a formula provided below.
It should be noted that the expressions "R ^" and "R ~" imply symbols, which correspond to alphabets "R" added respectively with "^" and "~" placed above them, as expressed in the formula (2). These expressions are applied similarly to "s ^", "c ^" and "H ^" used below.
Mathematics 3
In the above formula, it denotes a transfer function of subcarrier k of the first OFDM symbol, which was estimated by the channel estimation unit 203. denotes a replica of a transmission signal in subcarrier k of the first OFDM symbol, which was generated by transmission signal replica generation unit 241. is a replica that is made from known signals (for example, CRS, PSS and SSS) in the resource elements where these known signals are mapped, and 0 (null ) on other appeal elements.
In the framework limited by resource mapping having the subframe format of figure 4, for example, a replica 1, 8) of a transmission signal in the first and eighth OFDM symbols is expressed by the following formula.
Mathematics 4
In the above formula, m = 0, 1, ..., 2 (M-1) (M is the number of resource blocks) is considered and CRS ^ denotes a reference signal generated by the signal generation replica unit. transmission 241. For the other OFDM symbols as well, the transmission signal replica generation unit 241 generates an interference replica by designation, for the resource element where the known signal is mapped, a replica of the relevant known signal, and by assignment of 0 to other resource blocks.
When there are several antenna numbers, the transmission signal replica generation unit 241 generates an interference replica based on the subframe format transmitted from each antenna port.
For example, when the base station device 100-1 having two antennas transmits in the format shown in figure 5, a replica of a transmission signal in the first, fifth, eighth, and twelfth OFDM symbols is expressed by the formula next: Mathematics 5
Fig. 11 is a reception flow chart for a mobile station device in the radio communication system according to the first embodiment of the present invention.
In figure 1, the relevant mobile station device is represented as the mobile station device 200-u (u = 2 and / or 3). The mobile station device 200-u detects a control signal which is contained in the signal transmitted from the base station device 100-2 and which is related to the interference cancellation process (S201), and determines the need or not the interference cancellation process based on the detected control signal (S202). If the need for interference cancellation processing (that is, 5 an indicator related to the interference cancellation process being "1") is detected (YES in S202), the mobile station device 200- u runs, at the predetermined time delay , a process of detecting a data signal after applying the interference cancellation process to the known signal (for example, CRS) (S204). On the other hand, if the non-necessity of the interference cancellation process (that is, the indicator related to the interference cancellation process being equal to "0") is detected (NOT in S202), the mobile station device 200- u performs a data signal detection process without applying the interference cancellation process (S203). The timing of the execution of the interference cancellation process, that is, the subframe submitted to the interference cancellation process, can be determined in advance or can be notified from the base station device to the mobile station device.
In addition, the information regarding the arrangement of the known signal can also be determined from other information, such as cell information, the number of CRS ports, etc. that are contained in the control signal.
Figure 12 illustrates the receipt of subframes by the mobile station device 200-2, the subframes being transmitted from the base station device 100-1 and the base station device 100-2. The base station device 200-2 of figure 1 receives a signal (causing Intercellular Interference) transmitted in a transmission frame format 251 from the base station device 100-1 and a signal transmitted in a transmission format. transmission frame 252 from the base station device 100-2. In the first embodiment of the present invention, the base station device 100-1 maps (i) the data signal (for example, PDSCH) and the control signals (such as PDCCH, CRS, SSS and PSS) intended for the device mobile station device (i.e., mobile station device 200-1 in figure 1), which is connected to the relevant base station device, subframes N, and (ii) only predetermined control signals (such as CRS, SSS and PSS) to subframes A and M (that is, subframes limited by resource mapping denoted by the filled parts). Additionally, in the first embodiment of the present invention, the base station device 100-2 maps the data signal, which is transmitted to the mobile station device 200-2 to only one subframe (denoted by a double dashed part in transmission frame format 252) transmitted during the time delay in which subframe A is transmitted.
As a result, it is possible to mitigate the Intercellular Interference imposed on the 200-2 mobile station device, which is connected to a peak cell or a femto cell (for example, the base station device 100-2), from the macrocell (for example, the 100-1 base station device). In addition, in the first embodiment of the present invention, the base station device 100-2 notifies, to the mobile station device 200-2, information indicating that a process of removing a predetermined control signal (CRS) transmitted from of the base station device 100-1 (that is, the cancellation process) is necessary (or activated) for a subframe transmitted in the timing in which subframe A or N is transmitted.
Additionally, the base station device 100-2 notifies, to the mobile station device 200-2, information indicating that the process of removing the predetermined control signal (CRS) transmitted from the base station device 100-1 (that is, the cancellation process) is not necessary (or is disabled) for a subframe transmitted in the delay in which subframe M is transmitted.
The base station device 100-1 can change the number of transmit antennas or the number of layers depending on the channel status, QoS (Quality of Service) of the transmit signal, and so on.
Additionally, the number of Cell-Specific Reference Signals mapped in the subframes is also different depending on the number of transmission antennas or the number of layers.
As a result, an extension of Intercellular Interference received from the staging device
base 100-1 differs depending on the number of transmitting antennas or the number of layers.
For example, when the number of antennas is equal to 1 (figure 4), eight reference signals per resource block are mapped.
When the number of antennas is equal to 2 (figure 5), sixteen reference signals 5 per resource block are mapped.
When the number of antennas is equal to 4 (figure 6), twenty-four reference signals per resource block are mapped.
According to the first embodiment of the present invention, since known signals, such as the reference signal and the control signal, can be removed, it is possible on the 200-2 mobile station device connected to the peak cell or femto cell (for example, the 100-2 base station device), if it additionally mitigates the intercellular interference received from the macrocell (for example, the 100-1 base station device) without being affected by the number of signals predetermined known data that were mapped in subframe A by the macrocell.
While the above description is made with respect to the case in which the mobile station device performs the CRS cancellation process, the present invention is not limited to such a case.
For example, the first embodiment of the present invention can also be applied to the case in which the mobile station device performs a synchronization signal cancellation process, for example, PSS or SSS.
In this case, more specifically, the base station device notifies the cell ID or subframe number to the mobile station device (including information indicating the subframe to which the sync signal is mapped) with the RRC signaling.
Second Mode A second mode of the present invention will be described below with respect to the case in which, on a downlink in a radio communication system in which base station devices having different cell radii are developed, the devices base stations carry out transmissions in different downlink transmission formats.
A 100-α base station device and a device
mobile station 200-u according to the second modality of the present invention have similar configurations to the base station device 100-α and mobile station 200-u device according to the first modality, respectively , except for a control signal that is generated by the upper layer 102 and the control signal generation unit 104 to notify the control information regarding the cancellation process for the mobile station device.
The following description is made basically around different points compared to the first modality.
Figure 13 illustrates a transmission frame format for a downlink from the base station device 100-1 in the radio communication system according to the second embodiment of the present invention.
An upper stage of figure 13 represents the transmission frame format for downlink when the base station device 100-1 transmits signals to the mobile station device 200-1 connected to the base station device 100-1. The upper stage of figure 13 is made up of ten subframes including the Normal subframes, ABS, MBSFN subframes (Multi Frequency and Multimedia Broadcast Service Single Frequency Subframes). The normal subframes (corresponding to a subframe index No. 1, a subframe index No. 3, a subframe index No. 4, a subframe index No. 5, and a subframe index No. 9 at the stage top of figure 13) are made, as a general rule, CRS (denoted by a part filled in the drawing), PDCCH (denoted by a horizontally dashed part in the drawing), and PDSCH (denoted by an empty part in the drawing). In addition, the control signals (such as SSS (denoted by a line dashed by lines rising in the left direction in the drawing), and PSS (denoted by a line dashed by lines rising in the right direction in the drawing)) they are mapped into a predetermined subframe (for example, a subframe No. 5 in the top stage of figure 13). Only CRS and / or predetermined control signals (such as
SSS, PSS and PBCH (denoted by a latticed part in the drawing) are mapped in ABS (corresponding to a subframe index No. 0 in the upper stage of figure 13). In the MBSFN subframe, CRS is mapped (corresponding to a No. 2 subframe index, a No. 6 subframe index, a No. 7 subframe index, and a No. 8 subframe index). The number of CRSs mapped in the MBSFN subframe is less than in the Normal and ABS Subframe.
In the second embodiment of the present invention, signals (for example, PDSCH) in addition to the signals mentioned above as being mapped in ABS and in the MBSFN subframe are not mapped in ABS and in the MBSFN subframe (corresponding to the double dashed parts in the design). A lower stage of Figure 13 represents the downlink transmission frame format when the base station device 100-2 transmits signals to the mobile station device 200-2 and the mobile station device 200-3 both connected to the base station 100-2. The lower stage of figure 13 is made up of ten normal subframes.
The normal subframe is made up of, as a rule, CRS (denoted by a part filled in the drawing), PDCCH (denoted by a horizontally dashed part in the drawing), and PDSCH (denoted by an empty part in the drawing). In addition, the control signals (such as SSS (denoted by a part dashed by lines rising in the left direction in the drawing), PSS (denoted by a part dashed by lines rising in the right direction in the drawing), and PBCH (denoted by a lattice part in the drawing)), are mapped into predetermined subframes (for example, a subframe No. 0 and a subframe index No. 5 at the lower stage of figure 13). The control signal generation unit 104 of the base station device 100-2 according to the second modality of the present invention generates the control signal, which includes the information indicating the need or not for cancellation on the control device. mobile station and / or cell for which cancellation is to be performed, taking into account the transmission format configured by the base station device
100-1 and illustrated in the upper stage of figure 13. In one example, the information indicating whether or not the cancellation is required is configured to (i) notify the cancellation process for the sub-frame in which the MBSFN sub-frame is required. 5 transmitted from the base station device 100-1 and (ii) to notify the need for the cancellation process for the subframe in which the Normal Subframe and / or ABS subframe is transmitted from the base station device 100-1. The base station device 100-2 prepares, for example, a 1-bit area to indicate the information regarding the need or not for the cancellation of interference in the PDCCH or RRC signaling, and notifies the need for the cancellation process by the configuration - tion "0" in this area and the need for the cancellation process by setting "1" in that area.
Upon receipt of the control signal that includes the information indicating whether or not the cancellation is required, the mobile station device 200-2 and / or the mobile station device 200-3 performs the cancellation process in the subframe based on the information indicating whether or not the cancellation is required.
In another example, information indicating whether or not cancellation is required notifies the arrangement of the Normal Subframe, MBSFN subframe and the Normal Subframe in the format transmitted from the base station device 100-1. The base station device 100-2 prepares, for example, a 2-bit area to indicate the information regarding the need or not to cancel interference in PDCCH or RRC signaling, and notifies the Normal Subframe by setting "01" in this area, the MBSFN subframe for the "10" setting in that area, and ABS for the "11" setting in that area.
The mobile station device 200-2 and / or the mobile station device 200-3 having received the control signal, which includes the information indicating whether or not the cancellation is required, performs the cancellation process in the relevant subframe upon obtaining the information "01" and / or "11", each indicating the need for cancellation or not, and then executes the demodulation process, the decoding process, etc.
On the other hand, when the mobile station device 200-2 and / or the mobile station device 200-3 obtains the information "10" indicating the need for cancellation or not, it executes the demodulation process, decoding process, etc., without executing the cancellation process in the relevant subframe.
It should be noted that the information regarding the cell for which the cancellation must be performed is notified in the same way as in the first modality.
According to the second embodiment of the present invention, as described above, when the macrocell (for example, the base station device 100-1) transmits signals in the transmission format consisting of various types of subframes, the peak cell or the femto cell (for example, the base station device 100-2) can determine the information indicating whether or not cancellation is required depending on the number of known signals, such as Cell-specific Reference Signals.
The mobile station device connected to the pico cell or femto cell can remove the known signals, such as the reference signal and the control signal, based on the information indicating the need for cancellation or not, and thus additionally mitigates the Intercellular interference that is received from the macrocell, without being affected by the number of known signals.
Third Modality A third modality of the present invention will be described below with respect to another method of notification for carrying out control related to the cancellation process by a mobile station device on a downlink in a radio communication system in which the radio devices base station having different cell radii are developed.
A 100-α base station device and a 200-u mobile station device according to the third embodiment of the present invention have similar configurations to the 100-α base station device and 200-u mobile station device according to with the first modality, respectively, except for a control signal that is generated by the upper layer 102 and the control signal generation unit 104 to notify the control information regarding the cancellation process for the mobile station device.
The following description is made basically around different points without comparison with the first modality.
A downlink control signal according to the third embodiment of the present invention includes information indicating the sub-frame in which the cancellation process is to be performed on the mobile station device.
The control signal corresponds to PDCCH or RRC signaling.
Figure 14 illustrates an example of the downlink control signal according to the third embodiment of the present invention.
The control signal includes information (bitmap) regarding the subframes in which the cancellation process is to be performed on the mobile station device 200-u.
Figure 14 illustrates the case in which 10 bits are mapped to the control signal as information regarding the subframes to be submitted to the cancellation process.
In figure 14, "1" represents the need for the cancellation process, and "0" represents the non-need for the cancellation process.
The example in figure 14 notifies that the cancellation process is executed in the first, second, sixth and seventh subframes among the ten subframes constituting a table.
When the mobile station device 200-u receives the control signal including the information regarding the subframes to be submitted to the cancellation process, the interference removal unit 206 performs, based on the information received, the removal process of interference (cancellation process) in the subframe for which the need for the cancellation process is indicated.
In addition, the downlink control signal according to the third embodiment of the present invention includes information regarding the cells in which the cancellation process must be performed on the mobile station device.
The control signal corresponds to the PDCCH or RRC signaling.
Figure 14 illustrates the case in which 8 bits are mapped as cell information to the control signal.
In other words, a maximum number of 256 cell IDs can be notified.
In the example in figure 14, it is notified that the cell ID of the base station device for which the cancellation process is to be performed is 5 equal to "1". Upon receipt of the control signal including the cell ID of the base station device for which the cancellation process is to be performed, the control signal detection unit 211 of the mobile station device 200-u extracts , from the control signal, the cell ID of the base station device for which the cancellation process is to be performed, and obtains information regarding the resource elements in each of which CRS of the base station device to be submitted to the cancellation process is mapped.
Based on information regarding the resource elements in each of which CRS of the base station device must be subjected to the cancellation process is mapped, the interference removal unit 206 performs the interference removal process in CRS in the subframe element for which the need for the cancellation process is indicated.
In addition, the downlink control signal according to the third embodiment of the present invention includes information regarding the number of layers of a signal in which the cancellation process must be performed on the mobile station device.
The control signal corresponds to the PDCCH or RRC signaling.
Figure 14 illustrates the case in which 4 bits are mapped, as the information regarding the number of layers, to the control signal.
In other words, a maximum of 16 layers can be notified.
The example in figure 14 notifies that the number of layers of the signal transmitted from the base station device for which the cancellation process must be performed is equal to 1. Upon receipt of the control signal that includes the Indian information - than the number of layers of the signal transmitted from the base station device for which the cancellation process is to be performed is equal to 1, the control signal detection unit 211 of the mobile station device 200-u extracts the layer number information and obtains the information regarding resource elements in each of which the CRS in the signal transmission on the relevant number of layers is mapped.
Based on the information regarding the resource elements in each of which the base station device's CRS has been subjected to the 5 cancellation process is mapped, the interference removal unit 206 performs the CRS interference removal process in the subframe for which the need for a cancellation process is indicated.
While the information regarding the subframe to be subjected to the cancellation process, the cell information, and the number of layers in the subframe to be submitted to the cancellation process is notified using the same control signal in figure 14, different control signals can be used to notify them.
In addition, the RRC signaling described above can be transmitted with PBCH or PDSCH.
When the information indicating the need or not of the interference cancellation process or cell information to perform the interference cancellation process is notified with the downlink control signal using the RRC signal transmitted with PBCH, the Relevant information can be notified in a cell specific way.
When the information indicating the necessity or not of the interference cancellation process or the cell information to execute the interference cancellation process is notified with the downlink control signal using the RRC signal transmitted with PDSCH, relevant information can be notified in a specific EU way.
According to the third embodiment of the present invention, as described above, the necessity or not of the cancellation process can be notified to the mobile station device by subframe.
As a result, the mobile station device can perform the interference cancellation process with a highly accurate timing.
Fourth Mode A fourth embodiment of the present invention will be described below
low with respect to another notification method for executing control related to the cancellation process by a mobile station device on a downlink in a radio communication system in which base station devices having different cell radii 5 are developed .
A 100-α base station device and a 200-u mobile station device according to the fourth embodiment of the present invention have similar configurations to the 100-α base station device and 200-u mobile station device according to with the first modality, respectively, except for a control signal that is generated by the upper layer 102 and the control signal generation unit 104 of the base station device 100-α, and includes control information regarding the control process. cancellation.
The following description is created basically on different points in comparison with the first modality.
Fig. 15 illustrates an example of a downlink control signal for a base station device according to the fourth embodiment of the present invention.
The downlink control signal corresponds to, for example, PDCCH.
MCS information is included in the downlink control signal according to the fourth embodiment of the present invention.
Figure 15 illustrates an example in which 4 bits are mapped as an area to indicate MCS information.
Figure 16 illustrates a modulation scheme and a rating rate with respect to an MCS information index.
More specifically, the MCS information in figure 15 corresponds to Index 3 in figure 16. The base station device 100-2 modulates a data signal (PDSCH) according to the MCS information configured as shown in figures 15 and 16, and transmits the modulated data signal to the mobile station device 200-u (u = 2, 3 in figure 1). The downlink control signal according to the fourth embodiment of the present invention additionally includes transmission format information.
The base station device 100-2 maps the data signal (PDSCH) according to the transmission format information from the base station device 100-1. Figure 15 illustrates an example in which 2 bits are mapped as an area to indicate the transmission format information.
Figure 17 illustrates a subframe configuration with respect to an index of the transmission format information.
More specifically, the transmission format information in figure 15 corresponds to Index 2 in figure 17. When the transmission format information index is equal to 2, the base station device 100-2 maps the data signal (PDSCH), intended for the mobile station device 200-u (u = 2, 3 in figure 1), for the first, second and sixth subframes.
While the information regarding the subframe to be submitted to the cancellation process, cell information and number of layers of the subframe to be submitted to the cancellation process are notified using the same control signal in figure 14, different control signals can be used to notify them.
The operation of the mobile station device according to the fourth embodiment of the present invention will be described below.
The mobile station device 200-u extracts MCS information and transmission format information from the control signal transmitted from the base station device 100-2, and determines whether or not the cancellation process is necessary based on a need / no need decision table for a cancellation operation.
Figure 18 illustrates an example of the necessity / non-necessity decision table for the cancellation operation, which is maintained in the mobile station device according to the fourth modality of the present invention.
When the index of the transmission format information is equal to 0, or when the index of the transmission format information is equal to 1 and the index of the MCS information is from 0 to 6, the control signal detection unit 211 determines that the cancellation process is not necessary.
When the index of the transmission format information is equal to 1 and the MCS information index is equal to 7 to 15, the control signal detection unit 211 determines that the cancellation process is necessary, and notifies the need of the cancellation process for the interference removal unit 206. Figure 19 is a flow chart with which the mobile station device in the radio communication system according to the fourth mode of the present invention determines the property of the canceller.
In figure 19, the mobile station device is considered the mobile station device 200 u = 2 and / or 3). The control signal detection unit 211 of the mobile station device 200-u extracts the MCS information and the transmission format information from the control signal that is contained in the signal transmitted from the base station device 100-2 (S301), and identifies the index of the transmission format information (S302). If the index of the transmission format information is equal to 0 (YES in S302), the mobile station device 200-u performs, based on the MCS information, a process of detecting a data signal without applying the process interference cancellation (S303). If the transmission format information index is not equal to 0 (NO, in S302), the mobile station device 200-u identifies the MCS information index (S304). If the index of the MCS information is 0 to 6 (YES in S304), the mobile station device 200-u performs, based on the MCS information, a process of detecting a data signal without applying the interference cancellation process (S305). If the index of the MCS information is not 0 to 6 (NOT in S304), the mobile station device 200-u performs, based on the MCS information, a process of detecting a data signal after execution , based on the transmission format information, the process of canceling interference in the known signal (eg, CRS), which was transmitted from the base station device 100-1 in ABS (S306). The resource element in which the known signal must be subjected to the cancellation process can also be determined from other information, such as cell information, number of CRS ports, etc., which are contained in the signal. control.
According to the fourth embodiment of the present invention,
As described above, the mobile station device can implicitly determine whether or not the cancellation process is required based on MCS information and transmission format information.
As a result, there is no need to add a new control signal to determine whether or not the cancellation process is necessary.
It is thus possible to suppress the reduction in the frequency utilization efficiency that would be caused by an increase in the number of control signals.
While in the above embodiment of the present invention the necessity or not of the cancellation process is determined implicitly based on the MCS information and transmission format information, the necessity or not of the cancellation process can be determined implicitly based on other information of control (for example, RI or PMI). Fifth Modality A fifth modality of the present invention described below refers to the generation of feedback information by a mobile station device, which has the function of a cancellation process, on a downlink in a radio communication system in which base station devices having different cell radii are developed.
A 100-α base station device and a 200-u mobile station device according to the fifth embodiment of the present invention have similar configurations to the 100-α base station device and 200-u mobile station device according to with the first modality, respectively, except for a method of generating return information by the upper layer 102 and control signal generation unit 104 mobile station device 200-u.
The following description is created basically on different points compared to the first modality.
Fig. 20 is a sequence diagram illustrating the connection between the base station device and the mobile station device and a control process flow in the radio communication system according to the fifth embodiment of the present invention.
The base station device 100-1 notifies, for the peripheral base station device 100-2,
formation related to the downlink transmission from the base station device 100-1 through the return access channel connection 10 in figure 1 (S401). Downlink-related information includes transmission format information 5 indicating, for example, the arrangement of Normal Subframe and / or limited resource mapping subframe, cell ID, number of CRS ports, etc.
The base station device 100-2 generates a control signal, which includes control information related to the cancellation process, based on information related to downlink transmission (S402), and transmits the control generated for the mobile station device 200-2 (S403). Control information related to the cancellation process includes information indicating whether or not the interference cancellation process is required, cell information to perform interference cancellation, and so on.
The signaling of the control information related to the cancellation process can be performed using the signaling method described above in the first to fourth modalities.
The mobile station device 200-2 generates the feedback information based on the control information related to the cancellation process (S404), and notifies the feedback information generated to the base station device 100-2 (S405) . Figure 21 is a flow chart illustrating the generation of feedback information in the fifth embodiment of the present invention.
The control signal detection unit 211 of the mobile station device 200-2 extracts the control information related to the interference cancellation process from the downlink control signal transmitted from the base station device 100 -1 and obtains the information indicating the need or not of the interference cancellation process (501). if the need for the interference cancellation process is notified (YES in S502), the mobile station device 200-2 configures the feedback information, such as CQI and RI, considering not only the channel status, but also the application of the information cancellation process
reference (S504). On the other hand, if the need for the interference cancellation process is notified (YES in S502), the mobile station device 200-2 configures the feedback information, such as CQI and RI, based on the channel status (S503 ). The mobile station device 200-2 then notifies the return information configured for the base station device 100-2 (S505). It is noted that the channel state is estimated from the reference signal, for example, CRS, transmitted from the base station device 100-2. Returning to figure 20, the base station device 100-2 configures, based on the feedback information, MCS, number of layers, etc. of a data signal transmitted to the mobile station device 202-2 and generates PDSCH by executing the coding process, modulation process, pre-coding process, etc., based on the parameters mentioned above (S406). The base station device 100-2 additionally generates the Physical Downlink Control Channel (PDCCH) to notify the MCS, the number of layers, etc. (S406). After that, the base station device 100-2 transmits PDSCH and PDCCH to the mobile station device 200-2 (S407). Upon receipt of PDSCH and PDCCH, the mobile station device 200-2 performs a PDSCH detection process (including the demodulation process and the decoding process) by applying the information-based interference cancellation process, such co- mo MCS and number of layers, which are determined in PDCCH (S408). According to the fifth embodiment of the present invention, as described above, the mobile station device generates feedback information considering not only the channel state, but also the need or not to apply the interference cancellation process.
The base station device transmits the data signal to the mobile station device based on the feedback information.
In this way, since the base station device 100-2 can configure MCS and the number of layers (number of space multiplexing)
to be adaptable to the high-speed transmission of the data signal, the frequency utilization efficiency can be increased.
A program for carrying out the functions of all or part of the base station device shown in figure 2 or all or a part of the terminal device shown in figure 9 can be recorded on a computer-readable recording medium, and the processes various components can be performed by having a computer system read and execute the program recorded on the recording medium.
The term "computer system" used here includes an OS and hardware such as peripheral devices.
In the case of using a WWW (World Wide Web) system, the "computer system" includes environments for presenting homepages (or display environments). In addition, the term "computer-readable recording medium" implies a storage device including a portable medium, such as a floppy disk, a magneto-optical disk, a ROM (read-only memory), or a CD-ROM ( compact disk), and a hard disk built into the computer system.
The "computer-readable recording medium" additionally includes not only a component that dynamically maintains the program for a short period of time, such as a line of communication, when the program is transmitted over a network, such as the Internet, or a communication line, such as a telephone line, but also a device that maintains the program for a certain time, as a volatile memory in the computer system serving as a server or a client in the case mentioned above .
The program mentioned above can perform some of the functions mentioned above, or it can perform the functions mentioned above in combination with the programs already saved on the computer system.
Alternatively, all or a part of the functions of the base station device shown in figure 2 or all or a part of the functions of the terminal device shown in figure 9 can be performed in an integrated circuit.
Various function blocks of the base station device and the terminal device can be individually made in the form of chips, or a part or all of the function blocks can be integrated in the form of a chip.
A method of realizing the integral circuit is not limited to the use of an LSI, and the method can be performed 5 by the use of a dedicated circuit or a universal processor.
In addition, if a technique for making an integral circuit instead of the LSI technique appears with the progress of semiconductor technology, the integral circuit using such a technique can also be used.
While the modalities of the present invention have been described in detail above with reference to the drawings, practical configurations are not limited to those described in the modalities above, and the present invention involves changes in the design within a scope that is not far from the heart of the present invention.
Appendix (1) In accordance with an aspect of the present invention, a base station device is provided in a radio communication system in which a base station device communicates with a mobile station device, where the station device base notifies, for the mobile station device, information indicating that a reference signal transmitted from another base station device and being specific to the other base station device is about to be canceled. (2) In accordance with another aspect of the present invention, a base station device is provided in a radio communication system in which several base station devices having different cell radii are developed, where the station device The base includes an upper layer for programming an information data signal, a control signal, and a reference signal according to a transmission frame format that is transmitted to a mobile station device from another station device. based on the radio communication system, and which is made up of various types of subframes, a resource mapping unit for mapping information data signal, control signal, and reference signal as subframe resources based on programming, and a transmission unit for transmitting subframes containing the information data signal, control signal and reference signal to the mobile station device, the control containing information indicating whether or not a cancellation process is required on the mobile station device. (3) A base station device in accordance with another additional aspect of the present invention is constituted in such a way that, in the base station device described in (2) above, the information indicating whether or not the cancellation process contains information notifying the user. sub-frame in which the cancellation process should be performed, based on the type of sub-frame constituting the transmission frame format. (4) A base station device according to another aspect of the present invention is constituted so that, in the base station device described in (3) above, the necessity or not of the cancellation process is configured for the subframe in the which the cancellation process should be performed, considering the reference signal contained in the relevant sub-table. (5). A base station device according to another aspect of the present invention is constructed so that, in the base station device described in (2) above, the transmission frame format is created from a subframe limited containing only a predetermined reference signal or control signal, and a normal subframe containing information data signal, control signal and reference signal and the information indicating whether or not the cancellation process indicates that the The cancellation process must be performed on the subframe transmitted from the transmission unit at the time delay in which the limited subframe is transmitted. (6) A base station device according to another aspect of the present invention is constituted so that, in the base station device described in (5) above, the limited subframe is an MBSFN subframe in which a multicast signal or a signal broadcasting is transmitted, or an ABS subframe in which the information data signal is transmitted to a particular mobile station device. (7) A base station device according to another additional aspect of the present invention is constituted in such a way that, in the base station device described in (2) above, the information indicating the need or not of the cancellation process is contained in the control signal as a bitmap indicating whether or not the subframe cancellation process is required. (8) A base station device according to another aspect of the present invention is constituted so that, in the base station device described in (2) above, the upper layer receives notification of the format of the other base station device. transmission frame to the other base station device. (9) In accordance with another additional aspect of the present invention, a mobile station device is provided in a radio communication system in which the various base station devices having different cell radii are developed, the mobile station including a receiving unit for receiving the transmitted subframes from the base station device, a control signal extraction unit for extracting a control signal from the subframes, and an interference removal unit for executing a cancellation process in the subframes, where the interference removal unit performs the cancellation process in the subframes according to a transmission frame format that is transmitted from another base station device in the radio communication system except for the base station device mentioned above, and which is made up of various types of subframes. (10) A base station device according to another aspect of the present invention is constructed so that, in the base station device described in (9) above, the interference removal unit removes a reference transmitted from another base station device mentioned above. (11) A base station device according to another aspect
of the present invention is constituted in such a way that, in the base station device described in (9) above, the subframes transmitted from the base station device include a control signal that contains information indicating the need or not of a cancellation process, the 5 control signal detection unit extracts, from the subframes, the information indicating the need or not of a cancellation process, and the interference removal unit performs a cancellation process based on in the information indicating the need or not of the cancellation process. (12) A base station device according to another aspect of the present invention is constructed so that, in the base station device described in (9) above, the subframes transmitted from the base station device include a control signal that contains information regarding an information data signal, the control signal detection unit extracts information from the information data signal from the subframes and the interference removal unit performs the cancellation process based on the information regarding the information data signal. (13) A base station device according to another aspect of the present invention is constructed so that, in the base station device described in (9) above, the control signal detection unit extracts, from of the subframes, information relating to a modulation scheme and an encoding rate of the information data signal and the interference removal unit performs the cancellation process depending on a predetermined modulation scheme and a predetermined encoding rate. (14) In accordance with another aspect of the present invention, a radio communication system is provided in which several base station devices having different cell radii are developed, where the base station device includes an upper layer for programming a information data signal, a control signal, and a reference signal according to a transmission frame format that is transmitted
to a mobile station device from another station device based on the radio communication system, which is made up of various types of subframes, a resource mapping unit for mapping the information data signal, the signal control, and the reference signal as subframe features based on programming, and a transmission unit for transmitting subframes containing the information data signal, the control signal, and the reference signal to the mobile station device and where the mobile station device includes a receiving unit for receiving the transmitted subframes from the base station device, count signal extraction unit for extracting the control signal from the subframes, and a unit interference removal to perform a cancellation process in the subframes according to the transmission frame format that is transmitted from the other base station device mentioned in above in the radio communication system except for the base station device mentioned above and which is made up of various types of subframes. (15) In accordance with another aspect of the present invention, a transmission method is provided for a base station device in a radio communication system in which the various base station devices having different cell radii are developed. , where the base station device performs the transmission method including the programming steps of an information data signal, a control signal, and a reference signal according to a transmission frame format that is transmitted to a device mobile station from another base station device in the radio communication system, which is made up of various types of subframes, mapping the information data signal, the control signal, and the reference signal as subframe resources based on programming, and transmission of subframes containing the information data signal, the control signal and the reference signal to the mobile station device, the control signal and containing information indicating whether or not a cancellation process is required on the mobile station device.
(16) In accordance with another aspect of the present invention, a receiving method is provided for a mobile station device in a radio communication system in which several base station devices having different cell radii are developed, where the mobile station device performs the reception method including the steps of receiving subframes transmitted from the base station device, extracting a control signal from the subframes, and executing a cancellation process on the subframes, where the step of executing the cancellation process performs the cancellation process according to a transmission frame format that is transmitted from another base station device in the radio communication system except for the mentioned base station device above, and that it is made up of various types of subframes. (17) In accordance with the golden aspect of the present invention, a communication method is provided in a radio communication system in which several base station devices having different cell radii are developed, where the base station device performs the programming steps of an information data signal, a control signal, and a reference signal according to a transmission frame format that is transmitted to a mobile station device from another base station device in the system radio communication, and which is made up of various types of subframes, mapping the information data signal, the control signal, and the reference signal as subframe resources based on programming, and transmitting subframes containing data from information, the control signal, and the reference signal to the mobile station device, and where the mobile station device performs the steps of receiving subframes transmitted from r from the base station device, extracting the control signal from the subframes, and performing a cancellation process on the subframes according to the transmission frame format that is transmitted from the other mentioned base station device above in the radio communication system except for the base station device mentioned above, and which is made up of various types of subframes.
Industrial Applicability The present invention can be suitably applied to a radio base station device, a radio terminal device, a radio communication system, and a radio communication method. 5 List of Reference Signals 100-1, 100-2 base station devices 200-1, 200-2, 200-3 mobile station devices 101 transmission antenna unit 102 upper layer 103 symbol generation unit 104 control signal generation 105 reference signal generation unit 106 resource mapping unit 107 IDFT unit 108 GI insertion unit 109 transmission unit 111 coding unit 112 modulation unit 121 receiving antenna unit 122 receiving unit 123 control signal detection unit 201 receiving antenna unit 202 receiving unit 203 channel estimating unit 204 GI removal unit 205 DFT unit 206 interference removing unit 207 channel compensation unit 208 demodulation unit 209 unit decoder 210 top layer 211 control signal detection unit
221 transmission antenna unit 222 transmission unit 223 control signal generation unit 241 transmission signal replica unit 242 interference replica unit 243 subtractor 251,252 transmission frame formats 1000-1, 1000-2 station devices base 2000-1, 2000-2, 200-3 mobile station devices.

权利要求:
Claims (20)
[1]
1. Base station device communication with a mobile station device on a cell phone comprising: a transmission unit configured to notify, for the mobile station device by RRC signaling, assistance information relating to a cell frequency, where the assistance information is information in a cell-specific reference signal from another cell, and includes a cell identification, the number of antenna ports for the cell-specific reference signal, and the subframe information indicating the subframes that are reserved for MBSFN.
[2]
Base station device according to claim 1, wherein another cell is a neighboring cell.
[3]
Base station device according to claim 1, wherein the subframes that are reserved for MBSFN include an OFDM symbol area in which the cell-specific reference signal is mapped, and an OFDM symbol area in which the cell-specific reference is not mapped.
[4]
Base station device according to claim 1, wherein the subframe information contains a bitmap indicating MBSFN subframe allocation in a predetermined number of subframe.
[5]
5. Base station device according to claim 1, in which the cell identification, the number of antenna ports, and the subframe information are assistive information to mitigate the interference of the specific reference signal of the cell.
[6]
6. Mobile station device communicating with a cell base station device, comprising: a receiving unit configured to receive, from the base station device by RRC signaling, assistance information relating to a frequency cell, where the assistance information is information about a cell-specific reference signal from another cell, and includes a cell identification, the number of antenna ports for the cell-specific reference signal, and the information subframe indicating subframes that are reserved for MBSFN. 5
[7]
Mobile station device according to claim 6, wherein the other cell is a neighboring cell.
[8]
8. Mobile station device according to claim 6, wherein the subframes that are reserved for MBSFN include an OFDM symbol area in which the cell-specific reference signal is mapped, and an OFDM symbol area in which the cell-specific reference signal is not mapped.
[9]
Mobile station device according to claim 6, wherein the subframe information contains a bitmap indicating MBSFN subframe allocation in a predetermined number of subframe.
[10]
10. Mobile station device according to claim 6, in which the cell identification, the number of antenna ports, and the subframe information are assistance information to mitigate interference from the alarm signal. cell-specific reference.
[11]
11. Transmission method on a base station device that communicates with a mobile station device in a cell, the transmission method comprising the step of: notifying the mobile station device via RRC signaling, relative assistance information at a cell frequency, where the assist information is information in a cell specific reference signal from another cell, and includes a cell identification, the number of antenna ports for the cell specific reference signal, and the subframe information indicating the subframes that are reserved for MBSFN.
[12]
Transmission method according to claim 11, wherein the other cell is a neighboring cell.
[13]
13. Transmission method according to claim 11,
[14]
where the subframes that are reserved for MBSFN include an OFDM symbol area in which the cell-specific reference signal is mapped, and an OFDM symbol area in which the cell-specific reference signal is not mapped. 14. Transmission method according to claim 11, wherein the subframe information contains a bitmap indicating MBSFN subframe allocation in a predetermined number of subframes.
[15]
15. Transmission method according to claim 11, in which the cell identification, the number of antenna ports, and the subframe information are assistance information to mitigate interference from the reference signal cell-specific.
[16]
16. Reception method on a mobile station device that communicates with a base station device in a cell, the reception method comprising the step of: receiving, from the base station device by RRC signaling, assistance information related to a cell frequency, where the assist information is information about a cell-specific reference signal from another cell, and includes a cell identification, the number of antenna ports for the cell-specific reference signal, and the subframe information indicating subframes that are reserved for MBSFN.
[17]
The method of reception according to claim 16, wherein the other cell is a neighboring cell.
[18]
18. Reception method according to claim 16, wherein the subframes that are reserved for MBSFN include an OFDM symbol area in which the cell-specific reference signal is mapped, and an OFDM symbol area in which the reference signal is specific to the cell is not mapped.
[19]
A method of reception according to claim 16, wherein the subframe information contains a bitmap indicating allocation of MBSFN subframe to a predetermined number of subframe.
[20]
20. Reception method according to claim 16, in which the cell identification, the number of antenna ports, and the subframe information are assistive information to mitigate interference from the reference signal cell-specific.

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法律状态:
2020-08-11| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-08-11| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04W 28/06 , H04W 92/10 , H04J 11/00 Ipc: H04J 11/00 (2006.01), H04W 72/04 (2009.01) |

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2021-11-03| B350| Update of information on the portal [chapter 15.35 patent gazette]|

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2022-02-22| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

优先权:

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申请号 | 申请日 | 专利标题

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JP2011027076A|JP5383725B2|2011-02-10|2011-02-10|Base station apparatus, mobile station apparatus, transmission method, reception method, and integrated circuit|

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JP2011-027076|2011-02-10|

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PCT/JP2012/052490|WO2012108349A1|2011-02-10|2012-02-03|Base station apparatus, mobile station apparatus, communication system, transmission method, reception method and communication method|

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