mobile terminal, communication system, base station and wireless communication methods

专利摘要:
WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION METHOD AND TERMINAL APPLIANCE. To efficiently perform adaptive control, even in the case of many transmit/receive antennas, a base station (200) is provided with a reference signal for channel state measurement generating part (209), which generates a reference signal. reference for channel state measurement for a mobile terminal (300) to measure a channel state, and transmit antenna parts (208-1, 208-2), which transmit reference signal for the state measurements of channel for the mobile terminal (300) with each transmit antenna port, and the mobile terminal (300) is provided with receive antenna parts (301-1, 301 - 2), which receives the reference signal for the measurements of the transmission channel state of the base station (200) at the receiving antenna ports, and a feedback information generating part (310), which measures a channel state between the transmitting antenna port and the port. of receiving antenna based on the received reference signal for measurement of d state. and channel to calculate a channel state estimation value, performs grouping of a plurality of estimation values of (...).
公开号:BR112012007539B1
申请号:R112012007539-0
申请日:2010-09-16
公开日:2021-05-18
发明作者:Kazuyuki Shimezawa；Toshizo Nogami
申请人:Sharp Kabushiki Kaisha；
IPC主号:

专利说明:

Technical Field
[0001] The present invention relates to techniques for performing adaptive control and, more particularly, to a wireless communication system, communication apparatus, wireless communication method and a terminal apparatus capable of effectively performing adaptive control in a channel state feedback method. Background of the Technique
[0002] For example, in wireless mobile communications systems such as LTE (Long Term Evolution), Advanced LTE, and WiMAX, each of a base station and a mobile terminal is provided with a plurality of transmit/receive antennas , and is capable of achieving high speed data transmission by MIMO (Multiple Input and Multiple Output) techniques. Meanwhile, using a reference signal for channel state measurement, a mobile terminal estimates a channel state between the base station and the mobile terminal, adaptively controls the modulation scheme and coding rate (MCS (Modulation Scheme and Encoding)), the number of spatial multiplexing (layers, classification), precoding weights (precoding matrix) and the like based on the estimation result, and is thus able to achieve more efficient data transmission. For example, it is possible to use the method as described in the non-patent document 1.
[0003] Meanwhile, in the case of using multicarrier transmission schemes as an OFDM (Orthogonal Frequency Multiplexing) and OFDMA (Orthogonal Frequency Division Multiple Access) scheme as a transmission scheme, it is possible to use reference signals spread over resource elements (each of which is an element consisting of a subcarrier in an OFDM symbol) in the frequency domain and the time domain as a reference signal for measuring channel state specific to a base station. As feedback information to estimate using such a reference signal for channel state measurement, it is possible to use information based on channel state (explicit CSI (Channel State Information)), recommended transmission format information (Implicit CSI (eg including the CQI (Quality Indicator Channel), RI (Rating Indicator), PMI (Precoding Matrix Index), etc.) for the base station, and the like.
[0004] Particularly since the explicit CSI is information based on the actual channel state, the amount of feedback information is large compared to the implicit CSI which is the index information mainly based on a codebook. Therefore, in Unattended Documents 2 and 3 the techniques for reducing the amount of information in the explicit CSI are studied, and for example, they are techniques that use the eigenvalue decomposition, orthogonal transform such as DCT (Discrete Cosine Transform), quantification vector, and the like. Prior Art Document Document without Patent
[0005] Non-Patent Document 1: 3rd Generation Partnership Project; Radio Access Network of the Technical Specification Group; Evolved Universal Terrestrial Radio Access (E-UTRA); physical layer procedures (Version 8), 3GPP TS 36.213 V8.7.0 (2009-05), May 2009.
[0006] Non-Patent Document 2: 3rd Generation Partnership Project; Radio Access Network of the Technical Specification Group; Additional Advances to Physical Layer Aspects E-UTRA (Version 9), 3GPP TR 36.814 V1.2.1 (2009-06), June 2009.
[0007] Non-Patent Document 3: Alcatel-Lucent, "Comparison of CSI Feedback Systems", R1-092310, 3GPP TSG-RAN GT1 #57bis, Los Angeles, CA, USA, June 2009. DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
[0008] However, as the number of transmit/receive antennas increases, the number of pieces of feedback information to be fed back increases, resulting in a factor that interferes with efficient data transmission.
[0009] The present invention has been made taking into account such circumstances, and it is an object of the invention to provide a wireless communication system, communication apparatus, wireless communication method and a terminal apparatus capable of effectively performing adaptive control, even when the number of transmit/receive antennas is large. Means to Solve the Problem (1) To achieve the above-mentioned objective, the present invention took measures as described below. In other words, a wireless communication system of the present invention is a wireless communication system in which a first communication apparatus and a second communication apparatus carry out wireless communication, and is characterized in that the first communication apparatus communication is provided with a reference signal for channel state measurement generation part, which generates a channel state measurement reference signal for the second communication apparatus for measuring a channel state, and an antenna part. which transmits the reference signal for channel state measurement to the second communication apparatus with each transmit antenna port, and that the second communication apparatus is provided with a portion of the receive antenna that receives the signal. reference for channel state measurement transmitted from the first communication apparatus at a receiving antenna port, and a feedback information generating part. A measurement that measures a channel state between the transmit antenna port and the receive antenna port based on the received reference signal for channel state measurement to calculate a channel state estimation value, performs grouping in a plurality of channel state estimation values, and generates feedback information to the first communication apparatus.
[00010] Thus, the second communication apparatus performs grouping in a plurality of channel state estimation values, and generates the feedback information for the first communication apparatus, and thus it is possible to significantly reduce the information amount of the channel information. feedback. Furthermore, for example, from the point of view of a power amplifier, in a system where signals are emitted from all transmit antenna ports in the first communication apparatus, it is possible to carry out data transmission from the first communication apparatus to the second communication apparatus without stopping a part thereof. (2) Furthermore, the wireless communication system of the present invention is characterized in that it has a plurality of first communication apparatus that perform cooperative communication to the second communication apparatus, where the feedback information generation part measures a channel state between the transmit antenna port of each of the first communication apparatus and the receive antenna port to calculate a channel state estimation value, and perform grouping on at least two state estimation values channel to generate the feedback information.
[00011] Thus, the second communication apparatus measures the channel state between the transmit antenna port of each of the first communication apparatus and the receive antenna port to calculate a channel state estimation value, and perform grouping at least two channel state estimation values to generate the feedback information and therefore the second communication apparatus positioned between the first communication apparatus is able to greatly reduce the interference effect between the same channels. Furthermore, it is possible to significantly reduce the amount of feedback information information. (3) Furthermore, in the wireless communication system of the present invention, the feedback information generation part is characterized by generating information indicative of the measured channel state as the feedback information.
[00012] Thus, the second communication apparatus generates the information indicative of the measured channel state as the feedback information, and it is thus possible to significantly reduce the amount of information of the information based on the channel state (explicit CSI (State Information of Channel)). (4) Still further, in the wireless communication system of the present invention, the feedback information generation part is characterized in that it generates information of recommended transmission format for the first communication apparatus, as the feedback information.
[00013] Thus, the second communication apparatus generates the recommended transmission format information for the first communication apparatus as the feedback information, and it is thus possible to considerably reduce the amount of information of the recommended transmission format information (implicit CSI (eg including the CQI (Quality Indicator Channel), RI (Rating Indicator), PMI (Precoding Matrix Index), etc.) for the first communication apparatus, and the like. (5) Furthermore , in the wireless communication system of the present invention, the feedback information generation part is characterized in that it performs grouping on previously specified channel state estimation values and thus generating the feedback information.
[00014] Thus, the second communication apparatus performs grouping in previously specified channel state estimation values and thus generates feedback information, and it is thus possible to significantly reduce the amount of information of the feedback information. Furthermore, for example, from the point of view of a power amplifier, in a system where signals are emitted from all transmit antenna ports in the first communication apparatus, it is possible to carry out data transmission from the first communication apparatus to the second communication apparatus without stopping a part thereof. (6) Furthermore, in the wireless communication system of the present invention, the feedback information generation part is characterized by selecting the channel state estimation values to have grouping performed from all the state estimation values calculated channel values, perform grouping on the selected channel state estimation values, and generate the feedback information.
[00015] Thus, the second communication apparatus selects the channel state estimation values to perform grouping, among all measured channel state estimation values, performs grouping on the selected channel state estimation values, and is thus able to transmit the feedback information with flexibility corresponding to the channel state. (7) Furthermore, in the wireless communication system of the present invention, the feedback information generation part is characterized by additionally generating the information indicative of the selected channel state estimation values as the feedback information.
[00016] Thus, the second communication apparatus additionally generates the information indicative of the selected channel state estimation value as the feedback information, and therefore the first communication apparatus is able to grasp the transmit antenna port and the receive antenna port that performs combination processing. (8) Still further, in the wireless communication system of the present invention, the feedback information generation part is characterized by performing grouping on the channel state estimation values based on a codeword unit.
[00017] Thus, the second communication apparatus performs grouping on the channel state estimation values based on a codeword unit, and is thus able to perform combination processing on antenna ports that emit the same codeword . (9) Furthermore, in the wireless communication system of the present invention, the feedback information generation part is characterized by performing grouping on the channel state estimation values based on a setting of at least a part of the transmit antenna and the receiving antenna part.
[00018] Thus, the second communication apparatus performs the grouping in the channel state estimation values based on the configuration of at least a part of the transmitting antenna and the part of the receiving antenna, and is thus able to carry out the processing matching antenna ports to antenna port characteristics. (10) Furthermore, in the wireless communication system of the present invention, the feedback information generation part is characterized by performing grouping on the channel state estimation values based on a correlation between the transmit antenna part and the receiving antenna part.
[00019] Thus, the second communication apparatus performs grouping on the channel state estimation values based on the correlation between the transmitting antenna part and the receiving antenna part, and is thus able to perform the combination processing , for example, at the antenna ports with the high antenna correlation of the transmit antenna. (11) Furthermore, in the wireless communication system of the present invention, the feedback information generation part is characterized by performing grouping on the channel state estimation values based on polarization of at least a part of the transmit antenna and part of the receiving antenna.
[00020] Thus, the second communication apparatus performs the grouping in the channel state estimation values based on polarization of at least one of the transmit antenna part and the receive antenna part, and is thus able to perform combination processing, for example, on antenna ports with the same antenna polarization as the transmit antenna. (12) Still further, in the wireless communication system of the present invention, the feedback information generation part is characterized by performing grouping on the channel state estimation values based on the spatial multiplexing number to be used by the first communication apparatus to the second communication apparatus.
[00021] Thus, the second communication apparatus performs the grouping on the channel state estimation values based on the spatial multiplexing number to be used by the first communication apparatus to the second communication apparatus, and therefore, for example, it is capable of performing combination processing such that the number of feedbacks to transmit antenna ports subjected to combination processing is the same as the number of spatial multiplexing determined in the first communication apparatus or in the second communication apparatus. (13) Furthermore, in the wireless communication system of the present invention, the feedback information generation part is characterized by defining a plurality of matching patterns in performing grouping on the channel state estimation values, and performing grouping in the channel state estimation values based on any of the matching patterns.
[00022] Thus, the second communication apparatus defines a plurality of matching patterns in performing grouping on the channel state estimation values, performs grouping on the channel state estimation values based on any of the matching patterns , and is therefore able to dynamically perform combination processing, and it is possible to realize excellent features. (14) Furthermore, in the wireless communication system of the present invention, the feedback information generation part is characterized by selecting the matching pattern based on at least one parameter among a parameter relating to the time axis, a parameter relating to the frequency axis, and a parameter relating to the first communication apparatus or a parameter relating to the second communication apparatus.
[00023] Thus, the second communication device selects the matching pattern based on at least one parameter among a parameter related to the time axis, a parameter related to the frequency axis, and a parameter related to the first communication device or a parameter relating to the second communication apparatus, thus eliminating the need for notification or feedback of information relating to the matching pattern for use, and is capable of reducing the overhead relating to the information. (15) Furthermore, a communication apparatus of the present invention is a communication apparatus which performs wireless communication with another communication apparatus, and is characterized by having a receiving antenna part, which receives a reference signal for channel state measurement transmitted from a transmit antenna port of the other communication apparatus at a receive antenna port, and a feedback information generating part that measures a channel state between the antenna port of transmission and receive antenna port based on the received reference signal for channel state measurement to calculate channel state estimation value, perform grouping in a plurality of channel state estimation values, and generate information of feedback to the other communication device.
[00024] Thus, the communication apparatus performs grouping in a plurality of channel state estimation values, and generates the feedback information to another communication apparatus, and thus it is possible to significantly reduce the amount of information of the feedback information . Furthermore, for example, from the point of view of a power amplifier, in a system where signals are emitted from all transmit antenna ports in another communication device, it is possible to carry out data transmission from another communication apparatus to the communication apparatus without stopping at a part thereof. (16) Furthermore, in the communication apparatus of the present invention, the feedback information generating part is characterized by measuring a channel state between the transmit antenna ports of a plurality of other communication apparatus and the antenna port to calculate the channel state estimation values, and perform grouping on at least two channel state estimation values to generate the feedback information.
[00025] Thus, the communication apparatus measures a channel state between the transmit antenna ports of a plurality of other communication apparatuses and the receive antenna port to calculate channel state estimation values, and perform grouping in at least two channel state estimation values to generate feedback information and therefore the communication apparatus positioned between the other communication apparatus is able to greatly reduce the interference effect between the same channels. Furthermore, it is possible to significantly reduce the amount of feedback information information. (17) Furthermore, a wireless communication method of the present invention is a wireless communication method in which a first communication apparatus and a second communication apparatus carry out wireless communication, and is characterized by at least comprising the steps of the first communication apparatus of generating a reference signal for measuring channel state to the second communication apparatus for measuring a channel state, and transmitting the reference signal for measuring channel state to the second apparatus of communication with each transmit antenna port, and the steps of the second communication apparatus of receiving the reference signal for measuring channel state transmitted from the first communication apparatus on a receive antenna port, measuring a state of channel between the transmit antenna port and the receive antenna port based on the received reference signal for channel state measurement to calculate a value of channel state estimation, performing grouping on a plurality of channel state estimation values to generate feedback information, and transmitting the generated feedback information to the first communication apparatus.
[00026] Thus, the second communication apparatus performs grouping in a plurality of channel state estimation values to generate the feedback information, and it is thus possible to significantly reduce the amount of information of the feedback information. Furthermore, for example, from the point of view of a power amplifier, in a system where signals are emitted from all transmit antenna ports in the first communication apparatus, it is possible to carry out data transmission from the first communication apparatus to the second communication apparatus without stopping a part thereof. (18) Furthermore, in the wireless communication method of the present invention, it is a feature that the feedback information generating part measures a channel state between the transmit antenna ports of a plurality of first communication apparatus and the receiving antenna port to calculate channel state estimation values and performs grouping on at least two channel state estimation values to generate feedback information.
[00027] Thus, the second communication apparatus measures a channel state between the transmit antenna ports of a plurality of first communication apparatuses and the receive antenna port to calculate the channel state estimation values, and perform grouping at least two channel state estimation values to generate the feedback information and therefore the second communication apparatus positioned between the first communication apparatus is able to greatly reduce the interference effect between the same channels. Furthermore, it is possible to significantly reduce the amount of feedback information information. (19) Furthermore, a terminal apparatus of the present invention is characterized by having a feedback information generating part that obtains a precoding matrix that provides an ideal receive state in the grouping of transmit antenna ports, and generates feedback information indicative of the obtained precoding matrix.
[00028] Thus, the precoding matrix is obtained that provides an ideal receive state in the grouping of transmit antenna ports, the feedback information indicative of the obtained precoding matrix is generated, and it is thus possible to obtain the precoding matrix that provides an ideal receive state. Here, as the ideal receive state, for example, there may be a state where the receive power is maximum, another state where interference power from another base station and another mobile terminal is small (including the case use of an interference canceller, etc.) and the like. (20) Furthermore, a terminal apparatus of the present invention is characterized by having a feedback information generating part that obtains a precoding matrix which is of precoding weights such that each of transmit antenna ports The clusters perform the same precoding processing and provide an ideal receive state, and generate feedback information indicative of the obtained precoding matrix.
[00029] Thus, the precoding matrix is obtained, which is of precoding weights such that each of the grouped transmit antenna ports performs the same precoding processing and provides an ideal receive state, the feedback information indicative of the obtained precoding matrix is generated, and it is thus possible to obtain the precoding matrix that provides the ideal receive state. (21) Furthermore, in the terminal apparatus of the present invention, the feedback information generation part is characterized by performing grouping on the transmit antenna ports for each cross-antenna polarization.
[00030] Thus, grouping is performed on the transmit antenna ports for each cross-antenna polarization, and it is thus possible to perform the combination processing on only a part of the transmit antenna ports. (22) Still further, a terminal apparatus of the present invention is a terminal apparatus that performs communication with a base station apparatus, and is characterized by having a receiving antenna part, which receives a reference signal for the measurement. of channel state transmitted from a transmit antenna port of the base station apparatus to a receive antenna port, and a feedback information generating part measuring a channel state between the transmit antenna port and the receiving antenna port using the received reference signal for the channel state measurement to calculate the channel state estimation value, and generate feedback information to the base station apparatus based on a frequency response calculated through performing grouping on a plurality of channel state estimation values.
[00031] Thus, the terminal apparatus receives a reference signal for measuring channel state transmitted from the transmit antenna port of the base station apparatus at the receiving antenna port, measures a channel state between the transmit port. transmit antenna and receive antenna port using the received reference signal for channel state measurement to calculate a channel state estimation value, and generate feedback information to the base station apparatus based on a response calculated by performing grouping on a plurality of channel state estimation values, and it is thus possible to significantly reduce the amount of feedback information information. Furthermore, for example, from the point of view of a power amplifier, in a system where signals are emitted from all transmit antenna ports in the base station, it is possible to carry out data transmission from the base station to the mobile terminal, without stopping at a part of it. Advantageous Effect of the Invention
[00032] According to the present invention, it is possible to significantly reduce the amount of feedback information information that the mobile terminal transmits to the base station. Furthermore, for example, from the point of view of a power amplifier, in a system where signals are emitted from all transmit antenna ports in the base station, it is possible to carry out data transmission from the base station to the mobile terminal, without stopping at a part of it. BRIEF DESCRIPTION OF THE DRAWINGS
[00033] Figure 1 is a schematic block diagram showing a configuration of a base station 200 of the present invention;
[00034] Figure 2 is a diagram showing an example of a reference signal for data signal demodulation, reference signal for channel state measurement, information data signal or control information signal mapped by a layer mapping part 204 and a resource element mapping part 206;
[00035] Figure 3 is a schematic block diagram showing a configuration of a mobile terminal 300 of the present invention;
[00036] Fig. 4 is a schematic block diagram showing a configuration of a feedback information generating part 310 of the present invention;
[00037] Figure 5 is a diagram showing a communication system comprised of transmit antenna ports #0 to #3 on a base station 401 and receive antenna ports #0 to #3 on a mobile terminal 402, as an example of embodiment 1 of the present invention;
[00038] Figure 6 is a diagram showing a communication system comprised of transmit antenna ports #0 to #3 on a base station 501 and receive antenna ports #0 to #3 on a mobile terminal 502. as an example of embodiment 2 of the present invention;
[00039] Figure 7 is a diagram showing a communication system comprised of transmit antenna ports #0 to #3 on a base station 601 and receive antenna ports #0 to #3 on a mobile terminal 602, as an example of embodiment 3 of the present invention;
[00040] Figure 8 is a diagram showing a communication system comprised of transmit antenna ports #0 to #3 on a base station 701 and receive antenna ports #0 to #3 on a mobile terminal 702, as an example of embodiment 4 of the present invention;
[00041] Figure 9 is a diagram showing a communication system comprised of transmit antenna ports #0 to #3 on a base station 801 and receive antenna ports #0 to #3 on a mobile terminal 802, as an example of embodiment 5 of the present invention;
[00042] Figure 10 is a schematic diagram of a wireless communication system according to embodiment 6 of the present invention;
[00043] Figure 11 is a schematic diagram, with attention directed to the numbers of antennas of the wireless communication system according to embodiment 6 of the present invention;
[00044] Figure 12 is a diagram showing a communication system comprised of transmit antenna ports #1-0 to #1-3 on a 901-1 base station, transmit antenna ports #2-0 and 2 -1 # at a base station and 901-2 receive antenna ports # 0 to #3 at a mobile terminal 902 as an example of embodiment 6 of the present invention;
[00045] Figure 13 is a diagram showing a communication system comprised of transmit antenna ports #0 to #3 on a base station 1001 and receive antenna ports #0 to #3 on a mobile terminal 1002, such as an example of embodiment 7 of the present invention;
[00046] Figure 14 is a diagram showing an example of embodiment 8 of the present invention, where the N types of patterns to perform the combination processing are defined in advance and a mobile terminal 1102 performs the combination processing by any of the N types of matching patterns for performing feedback to a base station 1101; and
[00047] Figure 15 is a block diagram, showing an example for performing adaptive control, in the case of considering downlink in which a base station 100 performs data transmission to a mobile terminal 110. Best Way to Carry Out the Invention
[00048] Figure 15 is a block diagram, showing an example for performing adaptive control, in the case considering downlink in which a base station 100 performs data transmission to a mobile terminal 110. In base station 100, at First, a multiplexing part 102 multiplexes a reference signal for channel state measurement (RS (reference signal), the pilot signal, the known signal) specific for the base station into a data signal for the mobile terminal 110 or a data signal to another mobile terminal 110, and transmits the signal from a transmit antenna (part of the transmit antenna) 103.
[00049] In the mobile terminal 110, a demultiplexing part 112 demultiplexes the reference signal for channel state measurement from the signal received at a receiving antenna (receiving antenna part) 111. An information generating part Feedback 113 generates feedback information based on the reference signal for channel state measurement, and transmits the information from a transmit antenna 114 over the uplink. At the base station 100, a feedback information processing part 105 identifies the feedback information transmitted from the mobile terminal 110 from the signal received at the receiving antenna 104 to the process. An adaptive control part 101 performs adaptive control over the data signal to the mobile terminal 110 based on the received feedback information. Embodiments of the invention will be described below with reference to the drawings. Mod 1
[00050] Modality 1 of the present invention will be described further below. A communication system in mode 1 is provided with a base station (transmission apparatus, cell, transmission point, transmit antenna group, first communication apparatus, service base station, eNodeB, and base station apparatus) and a mobile terminal (receiving point receiving terminal, receiving apparatus, second communication apparatus, UE (User Equipment) and terminal apparatus).
[00051] Figure 1 is a schematic block diagram showing a configuration of the base station 200 of the invention. In Fig. 1, the base station 200 is provided with an encoding part 201, scrambling part 202, modulation part 203, layer mapping part 204, precoding part 205, resource element mapping part 206, OFDM signal generating part 207, transmitting antenna 208, reference signal to channel state measurement generating part 209, receiving antenna 210, receiving signal processing part 211, feedback information processing part 212 , and reference signal for signal demodulation generating part 213. Receive antenna 210 receives a data signal including feedback information transmitted from a mobile terminal 300 (FIG. 3, described later), via link uplink (eg PUCCH (Physical uplink control channel), PUSCH (Physical uplink control channel), etc.).
[00052] The reception of the signal processing part 211 performs, on the signal received at the receiving antenna 210, reception processing such as OFDM demodulation processing, demodulation processing, decoding processing and the like, in response to the processing which the mobile terminal 300 performs for the transmission, and identifies feedback information from the received signal to output to the feedback information processing part 212. Furthermore, in the case where a plurality of mobile terminals 300, which carries out communications with the base station 200 exists, as uplink, and it is possible to multiplex a plurality of mobile terminals 300 using various multiple access schemes, including SC-FDMA (Single Carrier Frequency Division Multiple Access), SC-FDMA grouped, OFDMA, Time Division Multiple Access, Frequency Division Multiple Access, etc.
[00053] In addition, it is possible to use various methods as a method to identify the feedback information for each mobile terminal 300 at base station 200. For example, base station 200 designates resources (elements divided into time domain, code, frequency , or spatial or the like to transmit signals) for each mobile terminal 300 to transmit the feedback information, the mobile terminal 300 transmits the feedback information with the designated resources, and the base station 200 is thus able to identify. Furthermore, it is also possible to identify the feedback information by updating by adding a specific identification number for each mobile terminal 300 to the respective feedback information.
[00054] Feedback information processing part 212 generates adaptive control information to perform adaptive control on a data signal to transmit to mobile terminal 300, based on input feedback information such as explicit CSI, MCQ, PMI, RI, etc. Part 212 generates adaptive control information in base station 200 to output to coding part 201, modulation part 203, layer mapping part 204, precoding part 205, and resource element mapping part 206 in base station 200.
[00055] Described here is an adaptive control method based on feedback information. First, in the case where the recommended transmission format information for the base station 200 is inserted as the feedback information, it is assumed that the transmission format is known in advance indexed in both the base station 200 and the mobile terminal 300 , and the base station 200 performs adaptive control based on the broadcast format. More specifically, the CQI is information indicative of a coding rate and modulation scheme and therefore respectively allows the coding part 201 and the modulation part 203 to be controlled, the PMI is information indicative of a precoding matrix , and thus allows the precoding piece 205 to be controlled, and the RI is the information indicative of the number of layers (classification), and thus allows the layer mapping part 204 and the upper layer for codeword generation are controlled. In addition, in case also including feedback information relative to resource mapping, it is also possible to control the resource element mapping part 206. In addition, these types of adaptive control need not conform to the information received from recommended transmission format, and it is possible to determine based on various factors such as the state of other mobile terminals, the status of the communication system and the like.
[00056] Next, in the case where channel status information (explicit CSI) is output as feedback information, base station 200 is able to determine adaptive control. For example, base station 200 determines a precoding matrix so that the energy when mobile terminal 300 receives is maximum based on the information that is fed back, and is able to determine the optimal encoding rate, scheme of modulation and the number of layers at that time, and you can use various methods.
[00057] The encoding part 201 receives one or more codewords (transmission data signal, information data signal) to transmit which are inputted from a processing apparatus of a higher layer of the transmission apparatus, not shown . Each of the codewords is encoded with error correction codes such as turbo codes, convolutional codes, LDPC (Low Density Parity Check) codes and the like, and outputs the resultant to the 202 scrambling part. codeword, a processing unit for performing HARQ (automatic hybrid repeat request) retransmission control or the like, a processing unit for performing error correction coding, or a plurality of units may be used.
[00058] The scrambling part 202 generates scrambling codes that vary with each base station 200, and performs scrambling processing of the signal encoded in the coding part 201, using the generated scrambling code. The modulation part 203 performs the modulation processing of the scrambling processor signal using a modulation scheme such as BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), QAM (Amplitude Modulation Quadrature), etc., and produces the resultant for the layer mapping part 204. The reference signal for the data signal demodulation generating part 213 generates reference signal for data signal demodulations (Dm-RS ( reference signal demodulation), DRS (dedicated reference signal), pre-coded RS, user-specific reference signal, UE-specific RS) orthogonal between layers (Classification, spatial multiplexing) as a reference signal for the terminal mobile 300 to demodulate an information data signal, and output the signal to the layer mapping part 204.
[00059] At this point, as the reference signal for data signal demodulation, it is possible to use arbitrary signals (sequences), as long as the signals are known signals at both base station 200 and mobile terminal 300. For example, it is it is possible to use a random number based on a pre-assigned parameter such as a specific number for the base station 200 (cell ID), a specific number for the mobile terminal 300 (RNTI; Temporary Radio Network Identifier), etc., and pseudo noise sequences (for example, it is possible to use M sequences (maximum length), gold codes, orthogonal codes, Walsh gold codes, OVSF (Orthogonal Variable Scattering Factor) codes, Hadamard codes, Barker codes, etc. and Furthermore, sequences obtained cyclically by displacing these sequences, or cyclically expanding these sequences can be used. In addition, it is possible to search for sequences excellent in autocorrelation characteristics and/or characteristics. cross-correlation eristics using a computer and the like). Also, as a method of orthogonalization between layers, you can use the method (eg time division multiplexing, frequency division multiplexing, etc.) to make resource elements map to the reference signal for zero demodulation of data signal (zero) mutually between layers, code division multiplexing method using pseudo noise sequence, etc.
[00060] The layer mapping part 204 maps the reference signal for inputting data signal demodulation from the reference signal to the data signal demodulation generating part 213 for each of the layers to perform multiplexing space, such as MIMO. Furthermore, the part 204 maps signals outputted from the respective modulation part 203 and resource elements, except the reference signal for the data signal demodulation of each layer. For example, when one assumes that the number of codewords is «2» and the number of layers is "8", it is conceivable that each codeword is converted into four parallel signals to make the number of layers "8", but the invention is not limited to them.
[00061] The precoding part 205 performs precoding processing on the signal emitted from the layer mapping part 204 to transform it into parallel signals corresponding to the number of antenna ports (transmission antennas, logic gates). Here, like precoding processing, it is possible to use processing with a given precoding matrix, CDD (Cyclic Diversity Delay), and transmit diversity (SFBC (spatial frequency block code), STBC (code of space time block), TSTD (Time Switched Transmission Diversity), FSTD (Frequency Switched Transmission Diversity), etc.), but the invention is not limited thereto.
[00062] The reference signal for channel state measurement generating part 209 generates a reference signal for channel state measurement (cell specific reference signal, CRS (RS Common), cell specific RS, RS not pre-encoded), which is already known mutually between the base station 200 and the mobile terminal 300, in order to measure the channel state between the base station 200 and the mobile terminal 300 (more specifically, between the transmit antenna 208 and a receive antenna 301 (Fig. 3, described later)), and outputs the signal in the resource element mapping part 206. At this point, as the reference signal for channel state measurement, it is possible to use signals arbitrary (sequences), as long as the signals are known signals at both base station 200 and mobile station 300. For example, it is possible to use a random number and pseudo noise sequences based on a pre-assigned parameter such as a specific number to this one base 200 (cell ID (ID)). Furthermore, as an orthogonalization method between the antenna ports, it is possible to use the method to make resource elements map the reference signal to the null (zero) channel state measurement mutually between the antenna ports, the code division multiplexing method using pseudo noise sequence, etc.
[00063] The element resource mapping part 206 maps to the transmission data signal outputted from the precoding part 205 and the reference signal for channel state measurement outputted from the reference signal to the part of channel state measurement generation 209 for port resource elements of respective antenna.
[00064] Figure 2 is a diagram showing an example of the reference signal for data signal demodulation, the reference signal for channel state measurement, the information data signal or the control information signal mapped by the layer mapping part 204 and a resource element mapping part 206. Fig. 2 shows the case of mapping these signals when the number of antenna ports is "4" and the number of layers is "2". Furthermore, Fig. 2 shows a single resource block composed of 12 frequency domain subcarriers and 14 time domain OFDM symbols. In an OFDM symbol, each subcarrier is also called a resource element. In each subframe, 7 consecutive OFDM symbols in time domain are also called partition.
[00065] Among the feature elements, except white rectangles in figure 2, the reference signal for signal data demodulations of layer numbers 0 and 1 are represented respectively by D0 and D1, and reference signals for state measurement Channel values of antenna ports #0 to #3 are represented respectively by C0 to C3. Furthermore, in reference signal resource elements mapped to respective layers and antenna ports, resource elements in other layers and antenna ports are not assigned any signals, and made zero (null), and orthogonalization is thus established between the antenna layers and ports. Furthermore, as another method of determining orthogonalization between layers and antenna ports, it is also possible to apply code division multiplexing using pseudo noise sequences.
[00066] Furthermore, it is also possible to change the number of OFDM symbols of a resource block. For example, in case of adding a long guard interval length, it is possible to set the number of OFDM symbols of a single partition to "6". In addition, information data signals or control information signals are mapped to resource elements with the exception of the resource elements to which the reference signals are mapped in figure 2. Also, in this example, it is possible to set the number of layers of information data signal or control information signal to "2" at most, and for example, you can set the number of layers of information data signal to "2" by setting the number of layers of the control information signal at "1".
[00067] Here, it is possible to change the number of resource blocks corresponding to the frequency bandwidth (system bandwidth) used in the communication system. For example, it is possible to use 6 to 110 resource blocks, and additionally, it is also possible to make the entire system bandwidth more than 110 through frequency aggregation. A normal component carrier is made up of 100 blocks of physical resources, and with a guard interval inserted between the component carriers, the entire system bandwidth can be made up of 500 blocks of physical resources using 5 component carriers. In its expression by the bandwidth, for example, the component carrier is made up of 20 MHz, and with a guard interval inserted between the carriers in the component, it is possible to make the entire system bandwidth 100 MHz using 5 component carriers. In addition, it is also possible to continue to arrange subcarriers among the component carriers.
[00068] The OFDM signal generating part 207 performs frequency transform processing - time of the frequency domain signal emitted from the resource element mapping part 206 by Fast Inverse Fourier Transform (IFFT) or the like to transform for the signal in the time domain. Furthermore, by cyclically expanding a part of respective OFDM symbols, the guard interval (cyclic prefix) is added. The transmit antenna 208 performs processing to convert the signal emitted from the OFDM signal generating part 207 from the baseband into a radio frequency, and the like, and then transmits the signal.
[00069] Figure 3 is a schematic block diagram showing a configuration of the mobile terminal 300 of the invention. In Fig. 3, mobile terminal 300 is provided with receive antenna 301, OFDM signal demodulation part 302, resource element mapping part 303, filter part 304, layer-mapping part 305 demodulation part 306 , descrambling part 307, decoding part 308, channel estimating part 309, feedback information generating part 310 (channel state measurement part), transmitting signal generating part 311, and transmitting antenna 312 The mobile terminal 300 is provided with the receiving antenna 301 having at least one transmitting antenna, and the receiving antenna 301 receives a signal that is transmitted from the base station 200 and passed through the channel, and performs processing for convert the radio frequency signal into a baseband signal, and the like. The OFDM signal demodulation part 302 removes the added guard interval, and performs time-frequency transform processing by Fast Fourier Transform (FFT) or the like to transform for the frequency domain signal.
[00070] At this point, the receive signal on the k-th subcarrier is expressed as described below.


[00071] Furthermore, NTL represents the number of transmit layers, NR represents the number of receive antennas, R(k) represents a receive signal corresponding to each receive antenna, S(k) represents a transmit signal ( information data signal or control information signal) corresponding to each transmission layer, N(k) is the noise corresponding to each receive antenna, HDm(k) is a frequency response corresponding to each receive antenna and each transmission layer, and T represents a transposed matrix. Each HDm element; Z, Y(k) of HDm(k) represents a receive antenna port frequency response y (y = 0, • • •, NR-1) associated with a transmit layer port z (z = 0, • • •, NTL-1). Furthermore, it is preferable that HDm(k) is estimated from the reference signal for data signal demodulation. The resource element mapping part 303 demaps (splits) the signal mapped at the base station 200, outputs the information data signal to the filter part 304, outputs the reference signal for measuring channel state to the part. of generating feedback information 310, and further outputs the reference signal for data signal demodulation to the channel estimation portion 309.
[00072] Based on the input reference signal for data signal demodulation, the channel estimation part 309 performs variation estimation (frequency response, transfer function) of amplitude and phase in each resource element (estimation of channel) for each layer of each receive antenna 301, and obtain a channel estimation value. Furthermore, in resource elements to which the reference signal for data signal demodulation is not mapped, interpolation is done in the frequency domain and time domain based on resource elements to which the reference signal for the data signal demodulation is mapped, and channel estimation is performed. As the interpolation method, you can use several methods, including linear interpolation, parabola interpolation, polynomial interpolation, Lagrange interpolation, spline interpolation, FFT interpolation, least mean squared error (MMSE) interpolation, etc.
[00073] The filter part 304 performs channel compensation on the data signal for each receive antenna 301 emitted from the resource element mapping part 303 using the channel estimation value emitted from the channel estimation part 309, and detects a signal transmission S(k). As the detection method, it is possible to use ZF pattern (Zero Force), MMSE pattern and the like. For example, when the weighting factor used in detecting the ZF pattern or MMSE pattern is assumed to be MZF or MMMSE, it is possible to use the following weighting factor.

[00074] Furthermore, H(k) represents an estimated frequency response, HH(k) represents a complex conjugate of transposed matrix of H(k), -1 represents an inverse matrix, o2 represents noise power, and RNI represents an NRxNR unit matrix. The transmission signal for each transmission layer is estimated using its weighting factor M(k). Assuming the transmission signal is estimated in S(k), it is possible to detect as described below. [Eq.8] S(k) = M(k)R(k)
[00075] In addition, like other detection methods, it is possible to apply methods (eg QRM-MLD (M-algorithm QR and MLD decomposition), etc.) based on MLD (Maximum Detection Probability) methods , (eg SIC, MMSE-SIC Turbo, BLAST (Time architecture - space layered Bell Laboratories), etc.) based on SIC (Successive Interference Cancellation) methods, based on PIC (Parallel Interference Cancellation), etc. The demapping part layer 305 performs demapping processing on the signal for each respective codeword layer. The demodulation part 306 performs demodulation based on the modulation scheme used in the base station 200. The descrambling part 307 performs descramble processing based on the scrambling code used in the base station 200. The decoding part 308 performs the descrambling processing of error correction based on the coding method applied at the base station 200, and outputs the result to an upper layer processing apparatus of the mobile terminal 300, not shown. Meanwhile, the feedback information generating part 310 generates feedback information based on the reference signal to the channel state measuring part outputted from the resource element mapping part 303.
[00076] Fig. 4 is a schematic block diagram showing a configuration of the feedback information generating part 310 of the invention. In Fig. 4, the feedback information generating part 310 is provided with a channel state estimation value calculation part 3101, and grouping part 3102. As a method of generating the feedback information, using the signal of reference received by channel state measurement, measured is a frequency response, signal reception SINR (Signal / Interference power ratio plus noise), SIR signal reception (Signal / interference power ratio), SNR signal reception (signal-to-noise power ratio), path loss and the like at each receive antenna port associated with a respective transmit antenna port, and it is possible to generate the feedback information using these values.
[00077] Furthermore, as a unit to generate the feedback information, it is possible to use the frequency domain (for example, subcarrier base, resource element base, resource block base, base of a constituted subband by a plurality of resource blocks, etc.), time domain (e.g. OFDM symbol base, subframe base, partition base, radio frame base, etc.), spatial domain (e.g. gate base antenna, transmit antenna base, receive antenna base, etc.) and the like, and additionally it is also possible to combine them. In order to transmit (feed back), the feedback information emitted from the feedback information generating part 310 to the base station 200, the transmission signal generating part 311 performs encoding processing, modulation processing, transmission signal generation processing and the like, and generates a transmission signal. The transmit antenna 312 transmits the transmit signal including the feedback information generated in the transmit signal generating part 311 to the base station 200 over the uplink.
[00078] Further described is a detailed procedure when the mobile terminal 300 generates the feedback information. Described first is the case of getting the explicit CSI as the feedback information. The channel state estimation value calculation part 3101 obtains the channel state at each receive antenna port associated with a respective transmit antenna port. The frequency response on the k-th subcarrier at this point is expressed as described below.

[00079] Furthermore, NT represents the number of transmit antennas, NR represents the number of receive antennas, and H(k) represents a frequency response corresponding to each receive antenna and each transmit antenna. Each Hx, y(k) element of H(k) represents a frequency response of a receive antenna port y (y = 0, • • •, NR-1) associated with a transmit antenna port (x = 0, • • • , NT-1). Furthermore, it is preferable that H(k) is estimated from the reference signal for the channel state measurement.
[00080] At this point, to reduce the amount of explicit CSI feedback information, the grouping part 3102 performs combination processing (grouping) on the frequency responses of at least two antenna ports between both or any of the antenna ports. transmit antenna and receive antenna ports. Here, as the combination processing, it is possible to perform different types of processing, such as addition, multiplication, averaging operation (including arithmetic mean and geometric mean), comparison operation (including minimum, maximum and selection), etc. In addition, it is also possible to perform weighting on antenna ports to perform combination processing, and for example, it is possible to increase the weighting of an antenna port with excellent channel status, but the invention is not limited thereto. The case of performing addition such as blend processing will be described further below.
[00081] Figure 5 is a diagram showing a communication system comprised of transmit antenna ports #0 to #3 on a base station 401 and receive antenna ports #0 to #3 on a mobile terminal 402, such as an example embodiment of the invention 1. At this point, the frequency response on the k-th subcarrier is expressed as described below.

[00082] In the generation of feedback information, the mobile terminal 402 performs the combination processing of two predefined ports between the transmit antenna ports #0 to #3 and receive antenna ports #0 to #3. By For example, blend processing is performed on #0 and #2 transmit antenna ports and #1 and #3 transmit antenna ports, and yet, blend processing is performed on #0 and #0 receive antenna ports. #2 and on receive antenna ports #1 and #3. The H'(k) frequency response at this point is expressed as described below.

[00083] Based on the frequency response of the combination processing H'(k), the mobile terminal 402 generates the explicit CSI. At this point, like the feedback information, the frequency response H'(k) can be used without modification, and further, it is also possible to apply the techniques of amplitude quantization, phase quantization, eigenvalue decomposition, orthogonal transform such as DCT, vector quantization, and the like. Furthermore, the explicit CSI can be generated based on the frequency response obtained by performing the combination processing on the transmit antenna ports only, and for example, the frequency response on performing the combination processing on the transmit antenna ports. Transmit #0 and #2 and at Transmit #1 and #3 antenna ports is expressed as described below.

[00084] In addition, the explicit CSI can be generated based on the frequency response obtained by performing the combination processing only on the receiving antenna ports and, for example, the frequency response when performing the combination processing on ports of receive antenna #0 and #2 and on receive antenna ports #1 and #3 is expressed as described below.

[00085] As described above, performing combination processing on the frequency responses of at least two antenna ports between both or any of the transmit antenna ports and receive antenna ports, it is possible to significantly reduce the amount of feedback information information.
[00086] Furthermore, like the feedback information, it is also possible to obtain the implicit CSI based on the frequency response subjected to the already described combination processing. Described in particular is a procedure for obtaining the CQI, PMI and RI based on the SINR. Furthermore, each of the CQI and PMI can be preconfigured as a plurality of types of patterns (indexes) in order to select the one closest to the pattern. The frequency response submitted to the already described combination processing is used as a channel state estimation value to obtain the implicit CSI. In case the RI is determined, the number of layers is determined using the eigenvalue decomposition technique or similar. At this point, it is preferable to set the number of rows or columns being less than the frequency response matrix of combination processing with the maximum number of layers.
[00087] In the case of the determination of the PMI, based on the combination processing frequency request, a precoding matrix is obtained in order to obtain an ideal receive state. As the ideal receive state, for example, there may be a state where the receive power is maximum, another state where the interfering power of the other base station and another mobile terminal is small (including the use case of an interference canceller, etc.) and the like. In addition, it is also possible to obtain through the eigenvalue decomposition technique or similar. In the case of determining the CQI, a lookup table of CQIs that satisfy required quality in association with the SINR is previously defined, the SINR using the determined RI and PMI is obtained, and the CQI is determined from the table search . At this point, it is preferable that the CQI be determined so that the error rate at mobile terminal 402 is "0.1".
[00088] As described above, obtaining the implicit CSI using a frequency response obtained by performing combination processing on the frequency responses of at least two antenna ports between both or any of the transmit antenna ports and receiving antenna ports, for example, it is possible to decrease the number of lookup tables of the PMI and the like, and it is possible to reduce the amount of feedback information information. Furthermore, when the amount of feedback information is the same, it is possible to further increase the precision of the precoding processing.
[00089] Described below is the transmission of a transmit data signal from the base station 401 to the mobile terminal 402 using the feedback information as described above. As the transmission method, it is possible to use several methods. For example, in the communication system, as shown in figure 5, described is the case of performing combination processing (grouping) on transmit antenna ports # 0 and # 1 and transmit antenna ports # 2 and # 3 , between transmit antenna ports #0 to #3. Base station 401 generates precoding weights so that transmit antenna ports #0 and #1 and transmit antenna ports #2 and # 3 perform the same precoding processing for the mobile terminals 401, and multiply the data transmission signal for the mobile terminal 402 by precoding weights to be transmitted. Furthermore, it is possible to perform additional precoding processing such as Cyclic Delay (CDD) diversity between clustered transmit antennas. In this case, it is preferable that base stations 401 or mobile terminal 402 consider precoding processing between grouped transmit antenna ports.
[00090] By using the invention as described in embodiment 1, it is possible to significantly reduce the amount of information information, feedback such as explicit CSI and implicit CSI from the mobile terminal 402 to the base stations 401.
[00091] By using the invention as described in embodiment 1, it is possible to significantly reduce the amount of feedback information information such as explicit CSI and implicit CSI from the mobile terminal 402 to the base stations 401. , for example, from the point of view of a power amplifier, in the system that signals are emitted from all transmit antenna ports 401 of the base station, it is possible to carry out data transmission from the base station 401 to the mobile terminal 402 without stopping a part of it. Furthermore, in the above-mentioned description, combination processing at transmit antenna ports or receive antenna ports is described, and it is equal to performing combination processing on a respective channel state (channel state estimation value ) between each transmit antenna port and each receive antenna port. Furthermore, in the above-mentioned description, described is the case of using the reference signal for channel state measurement to generate the feedback information, and the mobile terminal can transmit the generated feedback information using the reference signal to the data signal demodulation. For example, it is possible to generate the CQI, RI, CSI or the like using the reference signal for data signal demodulation. Furthermore, combination processing can be performed on only a part of the antenna ports between transmit antenna ports and receive antenna ports, or can be performed on all antenna ports. Modality 2
[00092] Modality 2 of the present invention will be described further below. A communication system in mode 2 is provided with the same configuration as the communication system in mode 1. Therefore, the different aspects from mode 1 will be described further below in mode 2, in the generation of feedback information, the mobile terminal uses a channel state estimation value (frequency response), obtained by performing combination processing on antenna ports based on the codeword. For example, it is possible to perform combination processing on antenna ports that emit the same codeword.
[00093] Figure 6 is a diagram showing a communication system comprised of transmit antenna ports #0 to #3 on a base station 501 and receive antenna ports #0 to #3 on a mobile terminal 502. as an example of embodiment 2 of the present invention. In addition, at base station 501, transmit antenna ports #0 and #1 emit codeword #0, and transmit antenna ports #2 and #3 emit codeword #1. At this point, the mobile terminal 502 performs combination processing on transmit antenna ports #0 and #1, and transmit antenna ports #2 and #3, and based on the frequency responses, generates the feedback information.
[00094] In addition, the mobile terminal can perform combination processing on only a part of transmit antenna ports, and for example, can perform combination processing only on transmit antenna ports #0 and #1 that emit codeword #0. Furthermore, as described in embodiment 1, the mobile terminal may further perform combination processing on the frequency responses of at least two pre-specified receive antenna ports. Modality 3
[00095] The embodiment 3 of the present invention will be described below. A communication system in mode 3 is provided with the same configuration as the communication system in mode 1. Therefore, the different aspects from mode 1 will be described below. In mode 3, in generating the feedback information, the mobile terminal uses a channel state estimation value (frequency response), obtained by performing the combination processing based on the antenna configuration, in particular, performing the combination processing on antenna ports based on antenna correlation. For example, it is possible to perform combination processing on antenna ports with a high antenna correlation of the transmit antenna.
[00096] Figure 7 is a diagram showing a communication system comprised of transmit antenna ports #0 to #3 on a base station 601 and receive antenna ports #0 to #3 on a mobile terminal 602, as an example of embodiment 3 of the present invention. Also, at base station 601, each antenna gap between transmit antenna ports #0 and #1 and the antenna gap between transmit antenna ports #2 and #3 is 0.5 wavelength, resulting in high antenna correlation, and the antenna gap between transmit antenna ports #1 and #2 is 10 wavelengths, resulting in low antenna correlation. At this point, the mobile terminal 602 performs the combination processing on transmit antenna ports #0 and #1, and on transmit antenna ports #2 and #3, and based on the frequency responses, generates the feedback information. .
[00097] In addition, the mobile terminal can perform combination processing on only a part of the transmit antenna ports, and for example, can perform combination processing only on transmit antenna ports #0 and #1 with the high antenna correlation. Furthermore, combination processing can be performed on each of the antenna ports with a low antenna correlation. Furthermore, as described in embodiment 1, the mobile terminal can further perform combination processing on the frequency responses of at least two pre-specified receive antenna ports. Particularly, as described in embodiment 3, the combination processing can be performed based on the correlation of the receiving antenna antenna 301. Mode 4
[00098] The embodiment 4 of the present invention will be described below. A communication system in mode 4 is provided with the same configuration as the communication system in mode 1. Therefore, the different aspects from mode 1 will be described below. In mode 4, in generating the feedback information, the mobile terminal uses a channel state estimation value (frequency response), obtained by performing the combination processing based on the antenna configuration, in particular, performing the combination processing on antenna ports based on antenna polarization when using cross-antenna polarization. For example, it is possible to perform combination processing on antenna ports with the same antenna polarization as transmit antenna 208.
[00099] Figure 8 is a diagram showing a communication system comprised of transmit antenna ports #0 to #3 on a base station 701 and receive antenna ports #0 to #3 on a mobile terminal 702, as an example of embodiment 4 of the invention. In addition, on base station 701, transmit antenna ports #0 and #1 and transmit antenna ports #2 and #3 configure cross-antenna polarization. It is assumed that transmit antenna ports #0 and #2 are horizontally polarized, and that transmitting antenna ports #1 and #3 are vertically polarized. At this point, the mobile terminal 702 performs the combination processing on transmit antenna ports # 0 and #2, and transmit antenna ports #1 and #3, and based on the frequency responses, generates the feedback information. .
[000100] In addition, the mobile terminal can perform combination processing on only a part of transmit antenna ports, and for example, can perform combination processing only on transmit antenna ports #0 and #2, with the same polarization. Furthermore, the mobile terminal can perform combination processing, respectively, on transmit antenna ports with different polarization, and particularly can perform combination processing for each cross-antenna polarization. Furthermore, as described in embodiment 1, the mobile terminal can further perform combination processing on the frequency responses of at least two prespecified receive antenna ports. Particularly, as described in embodiment 4, combination processing can be performed based on polarization of the receiving antenna 301. Mode 5
[000101] The embodiment 5 of the present invention will be described below. A communication system in mode 5 is provided with the same configuration as the communication system in mode 1. Therefore, the different aspects from mode 1 will be described below. In mode 5, in generating the feedback information, the mobile terminal dynamically selects transmit antenna ports and receive antenna ports to perform combination processing based on channel state, and uses a state estimation value (frequency response), obtained by performing combination processing based on the selected antenna ports.
[000102] Figure 9 is a diagram showing a communication system comprised of transmit antenna ports #0 to #3 on a base station 801 and receive antenna ports #0 to #3 on a mobile terminal 802, as an example of embodiment 5 of the present invention. At this point, the mobile terminal 802 selects transmit antenna ports and receive antenna ports to perform combination processing so that the mobile terminal 802 is able to effect an optimal reception corresponding to the channel state. For example, the mobile terminal performs combination processing on transmit antenna ports #0 and #3, and on transmit antenna ports #1 and #2, additionally performs combination processing on receive antenna ports #0 and #2, and on receive antenna ports #1 and #3, and based on the frequency responses, generates the feedback information. As the feedback information, the mobile terminal additionally notifies the port numbers of transmit antenna ports and receive antenna ports subjected to combination processing. In addition, it is also possible to define previously selected and notified port numbers as a plurality of types of patterns (indexes).
[000103] In addition, the mobile terminal can perform combination processing on only a part of the antenna ports between transmit antenna ports or receive antenna ports. Modality 6
[000104] The embodiment 6 of the present invention will be described below. Figure 10 is a schematic diagram of a wireless communication system in accordance with embodiment 6 of the present invention. As shown in figure 10, the communication system in mode 6 is provided with at least two base stations 901-1 and 901-2 and mobile terminal 902, and the base stations and mobile terminal, respectively, have the same configurations as the base station 200 (figure 1) and mobile terminal at 300 (figure 3) in mode 1. Therefore, the different aspects from mode 1 will be described further below.
[000105] In figure 10, base stations 901-1 and 901-2 perform cooperative communication with mobile terminal 902. To perform cooperative communication, both base stations 901 are connected with a wired channel (interface X2), such as optical fibers to share the control information and transmission data signals. Furthermore, it is also possible to use a wireless channel using relay or similar techniques. In addition, the base station transmits 901-1, to the mobile terminal 902, the reference signal for the channel state measurement at the base station and 901-1 the transmission of the data signal to the mobile terminal 902. The base station 901 -2 transmits, to the mobile terminal 902, the reference signal for the channel state measurement at the base station 901-2 and the transmission data signal to the mobile terminal 902. These signals are transmitted cooperatively between the base stations 901. By performing such cooperative communication, the mobile terminal 902 positioned between the base stations 901 is able to greatly reduce the interference effect between the same channels.
[000106] Figure 11 is a schematic diagram, with attention directed to the numbers of antennas of the wireless communication system according to embodiment 6 of the present invention. In the communication system in mode 6, as shown in figure 11, the number of transmit antenna ports is different between base stations 901-1 and 901-2 that perform cooperative communication. For example, it is assumed that the number of transmit antenna ports provided at base station 901-1 is "4", the number of transmit antenna ports provided at base station 901-2 is "2", and that the number of transmit antenna ports provided in mobile station 902 is "4". At this point, in mode 6, to generate the feedback information, the mobile terminal uses a channel state estimation value (frequency response), obtained by performing combination processing on pre-specified transmit antenna ports in the base station 901, with the highest number of transmit antenna ports, based on base station 901, with the least number of transmit antenna ports.
[000107] Figure 12 is a diagram showing the communication system comprised of transmit antenna ports #1-0 to 1-3 # at base station 901-1, of transmit antenna ports #2-0 and #2 -1 at base station and 901-2 receive antenna ports #0 to #3 at mobile terminal 902 as an example of embodiment 6 of the present invention. Here, it is assumed that the reference signal for the channel state measurements emitted respectively from transmit antenna ports are independently of each other, and that the mobile terminal 902 is capable of measuring the channel state accordingly. independent. At this point, with respect to base station 901-1, mobile terminal 902 performs combination processing on transmit antenna ports #1-0 and #1-1, and on transmit antenna ports #1-2 and 1-3 #, and based on the frequency responses, generates the feedback information. Meanwhile, as far as base station 901-2 is concerned, the mobile terminal does not carry out the combination processing, and based on the respective frequency responses, it generates the feedback information. In addition, the mobile terminal may transmit the feedback information to each of the base stations 901, or may transmit the feedback information to at least one base station 901 (e.g., serving base station or anchor base station).
[000108] In addition, the mobile terminal can generate feedback information from a frequency response obtained by performing combination processing on pre-specified transmit antenna ports among all the provided transmit antenna ports in a plurality of base stations 901 that perform cooperative communication. Furthermore, as described in embodiment 1, the mobile terminal can further perform combination processing on the frequency responses of at least two receive antenna ports. Furthermore, the mobile terminal can perform combination processing on only a part of the antenna ports between transmit antenna ports or receive antenna ports. Furthermore, the invention in embodiment 6 is applicable to communication systems as described in embodiments 2 to 5. Modality 7
[000109] The embodiment 7 of the present invention will be described below. A communication system in mode 7 is provided with the same configuration as the communication system in mode 1. Therefore, the different aspects from mode 1 will be described below. In mode 7, in generating the feedback information, the mobile terminal uses a channel state estimation value (frequency response), obtained by performing combination processing on transmit antenna ports based on the spatial multiplexing number (number of classification, number of layers). For example, the mobile terminal is capable of performing combination processing such that the number of feedbacks on transmit antenna ports subjected to combination processing is the same as the spatial multiplexing number determined in a base station 1001 or mobile terminal 1002.
[000110] Figure 13 is a diagram showing a communication system comprised of transmit antenna ports #0 to #3 on a base station 1001 and receive antenna ports #0 to #3 on a mobile terminal 1002, such as an example of embodiment 7 of the invention. When the spatial multiplexing number is "4", the mobile terminal 1002 does not perform the transmit antenna port combination processing #0 to #3, and generates the feedback information based on the respective frequency responses. When the spatial multiplexing number is "3", the mobile terminal 1002 performs the #0 and #1 transmit antenna port combination processing, it does not perform the #2 and #3 transmit antenna port combination processing, and generates the feedback information based on the respective frequency responses. When the spatial multiplexing number is "2", the mobile terminal 1002 performs the combination processing of transmit antenna ports #0 and #1 and transmit antenna ports #2 and #3, and generates the feedback information based on their frequency responses. When the spatial multiplexing number is "1", the mobile terminal 1002 performs the transmit antenna port combination processing #0 to #3, and generates the feedback information based on the frequency response.
[000111] Furthermore, in the above-mentioned description, the process is described in which the mobile terminal performs the combination processing so that the number of feedbacks on transmit antenna ports subjected to the combination processing is the same as the number of spatial multiplexing determined at base station 1001 or mobile terminal 1002, but it is only essential that the antenna ports that perform combination processing are determined based on the spatial multiplexing number, and the invention is not limited thereto. Furthermore, as described in embodiment 1, the mobile terminal can further perform combination processing on the frequency responses of at least two receive antenna ports. Furthermore, the invention in embodiment 7 is applicable to communication systems as described in embodiments 2 to 6. Mode 8
[000112] The embodiment 8 of the present invention will be described below. A communication system in mode 8 is provided with the same configuration as the communication system in mode 1. Therefore, the different aspects from mode 1 will be described below. In mode 8, in generating the feedback information, the mobile terminal uses a channel state estimation value (frequency response), obtained by performing combination processing on specified antenna ports in advance, where a plurality of types of patterns of antenna ports (code books) that perform combination processing is predefined, and is switched (selected) according to timing to perform feedback.
[000113] Figure 14 shows an example of embodiment 8 of the present invention, where the N types of patterns to perform the combination processing are defined in advance and a mobile terminal 1102 performs the combination processing by any of the N types of the patterns of combination to perform feedback to a base station 1101. For example, as shown in Figure 5, a communication system comprised of transmit antenna ports #0 to #3 at base station 1101 and the receive antenna ports is considered. # 0 to # 3 on mobile terminal 1102. In addition, three types of matching patterns, 1 to 3, are assumed. In the first combination pattern, the mobile terminal 1102 performs the combination processing on transmit antenna ports #0 and #1 and on transmit antenna ports #2 and #3, and generates the feedback information based on the respective responses frequency. In the second combination pattern, the mobile terminal 1102 performs the combination processing on transmit antenna ports #0 and #2 and on transmit antenna ports #1 and #3, and generates the feedback information based on the respective responses frequency. In the third combination pattern, the mobile terminal 1102 performs the combination processing on transmit antenna ports #0 and #3 and on transmit antenna ports #1 and #2, and generates the feedback information based on the respective responses frequency.
[000114] In addition, like the combination patterns, it is possible to set the patterns for the receive antenna ports, and set the patterns for both the transmit antenna ports and the receive antenna ports. Mobile terminal 1102 switches to any of the corresponding combination patterns for timing to perform feedback. At this point, it is possible to define in advance the matching patterns for use corresponding to the number of times of feedback, or the like. Also, the base station can designate which matching pattern to use. Alternatively, the mobile terminal may select the matching pattern to use based on channel status or the like, and it is preferable for the mobile station to transmit additional information indicative of the matching pattern used as feedback. By this means, the mobile terminal is able to dynamically perform combination processing, and it is possible to realize excellent features. In addition, it is possible to define which matching patterns to use based on time domain parameters (subframe, partition number, number of radio frames, etc.) to perform feedback (or, instructed to perform feedback). By this means, the need is eliminated to notify or feed back information regarding the matching pattern to be used, and it is possible to reduce the overhead on the information.
[000115] Furthermore, in the above-mentioned description, the switching of combination patterns is based on the timing (the parameter in the time domain) to perform the feedback, but the invention is not limited to them. For example, combination patterns can be switched based on parameters in the frequency domain (including subcarrier, resource block, subband, component carrier, etc.). Furthermore, switching can be done by means of parameters with respect to base station 1101, and for example switching can be done between adjacent base stations 1101, can be done according to the configuration of base station 1101, or it can be between base stations 1101 that carry out cooperative communication. Furthermore, switching can be done by means of parameters in relation to the mobile terminal 1102. Still further, the factors can be combined. Furthermore, the invention in embodiment 8 is applicable to communication systems as described in embodiments 2 to 7. Description of Symbols 100, 200, 401, 501, 601, 701, 801, 901-1, 901-2, 1001 , 1101 base station 103 transmit antenna 110, 300, 402, 502, 602, 702, 802, 902, 1002, 1102 mobile terminal 111, 210, 301 receive antenna 113 feedback information generating part 209 reference signal to channel state measurement generation part 310 feedback information generation part 3102 grouping part

权利要求:
Claims (13)
[0001]
1. Mobile terminal (300) configured to communicate with a base station (200) having a plurality of transmit antenna ports, the mobile terminal (300) characterized in that it comprises: a feedback information generating unit ( 310) configured to generate feedback information based on a plurality of reference signals for channel state measurement, wherein each of the plurality of reference signals is transmitted using different from the plurality of transmit antenna ports, the plurality of reference signals are orthogonalized, the feedback information includes information indicating a precoding matrix that is selected by the mobile terminal (300) from a plurality of precoding matrices, the plurality of precoding matrices being predefined, each of the plurality of precoding matrices includes a plurality of rows, the plurality of rows, each corresponding to the one of the plurality of transmit antenna ports being, the plurality of rows and the corresponding ones of the plurality of transmit antenna ports being grouped into a plurality of groups, and each of the plurality of groups including at least two rows of the plurality of rows, and each of the plurality of rows in each of the plurality of precoding matrices includes at least one element defined by a first precoding and a second precoding, the first precoding being identically defined in each. of the plurality of groups, and the second precoding being defined differently in each of the plurality of groups.
[0002]
2. Mobile terminal (300), according to claim 1, characterized in that the feedback information generation unit (310) is configured to generate a CQI that is the information corresponding to a coding rate and a scheme of modulation such that a reception quality assuming the precoding matrix which is selected from the plurality of precoding matrices meets a required quality.
[0003]
3. Mobile terminal (300), according to claim 1, characterized in that the grouping is performed based on a base station parameter (200).
[0004]
4. Mobile terminal (300), according to claim 1, characterized in that the grouping is performed based on a parameter of the mobile terminal (300).
[0005]
5. Mobile terminal (300), according to claim 1, characterized in that the grouping is performed based on a parameter of a component carrier.
[0006]
6. A communication system, comprising: a base station (200) having a plurality of transmit antenna ports; and a mobile terminal (300) characterized in that the base station (200) and the mobile terminal (300) are configured to communicate with each other, the base station (200) comprises a reference signal for the data generation unit. channel state measurement (209) configured to generate a plurality of reference signals for channel state measurement, which is mutually known between the base station (200) and the mobile terminal (300), the mobile terminal (300) comprises a feedback information generating unit (310) configured to generate feedback information based on the plurality of reference signals for channel state measurement, each of the plurality of reference signals is transmitted using different ones of the plurality of gates. of transmit antenna, the plurality of reference signals are orthogonalized, the feedback information includes information indicative of a precoding matrix that is selected by the mobile terminal. (300) from a plurality of precoding matrices, the plurality of precoding matrices being predefined, each of the plurality of precoding matrices includes a plurality of rows, the plurality of rows, each corresponding to one of the plurality of transmit antenna ports, the plurality of rows and corresponding ones of the plurality of transmit antenna ports being grouped into a plurality of groups, and each of the plurality of groups including at least two rows of the plurality of rows , and each of the plurality of rows in each of the plurality of precoding matrices includes at least one element defined by a first precoding and a second precoding, the first precoding being identically defined in each of the plurality of groups, and the second precoding being defined differently in each of the plurality of groups.
[0007]
7. Communication system according to claim 6, characterized in that the feedback information generation unit (310) is configured to generate a CQI which is the information corresponding to a coding rate and a modulation scheme so that a reception quality assuming the precoding matrix which is selected from the plurality of precoding matrices meets a required quality.
[0008]
8. Base station (200) having a plurality of transmit antenna ports configured to communicate with a mobile terminal (300), the base station (200) characterized in that it comprises: a reference signal for the generating unit a channel state measurement (209) configured to generate a plurality of channel state measurement reference signals that are mutually known between the base station (200) and the mobile terminal (300); a receiving unit (210) configured to receive feedback information corresponding to a precoding matrix which is selected from a plurality of precoding matrices, the feedback information being based on the plurality of reference signals, and the plurality of precoding matrices being predefined; and a precoding unit (205) configured to perform mobile terminal processing (300) based on the feedback information, wherein each of the plurality of reference signals is transmitted using different from the plurality of transmit antenna ports. , the plurality of reference signals are orthogonalized, the feedback information includes information indicating a precoding matrix that is selected by the mobile terminal (300) from a plurality of precoding matrices, the plurality of precoding matrices. precoding being predefined, each of the plurality of precoding arrays includes a plurality of rows, the plurality of rows each corresponding to one of the plurality of transmit antenna ports, the plurality of rows and the corresponding ones of the plurality of transmit antenna ports being grouped into a plurality of groups, and each of the plurality of groups including at least the two rows of the plurality of rows, and each of the plurality of rows in each of the plurality of precoding matrices includes at least one element defined by a first precoding and a second precoding, the first precoding being identically defined in each of the plurality of groups, and the second precoding being defined differently in each of the plurality of groups.
[0009]
9. Base station (200) according to claim 8, characterized in that it further comprises: a receiving unit (210) configured to receive a CQI; an encoding unit (201) configured to control the encoding rate for the mobile terminal (300) based on the CQI; and a modulation unit (203) configured to control a modulation scheme for the mobile terminal (300) based on the CQI, wherein the CQI is the information corresponding to the coding rate and the modulation scheme, so that a quality assuming the precoding matrix which is selected among the plurality of precoding matrices meets a required quality.
[0010]
10. Wireless communication method performed by a mobile terminal (300) which is configured to communicate with a base station (200) having a plurality of transmit antenna ports, the wireless communication method is characterized by the fact that comprises the steps of: generating feedback information based on a plurality of reference signals for channel state measurement, wherein each of the plurality of reference signals is transmitted using different from the plurality of transmit antenna ports, the plurality of reference signals are orthogonalized, the feedback information includes information indicating a precoding matrix which is selected by the mobile terminal (300) from a plurality of precoding matrices, the plurality of precoding matrices being predefined, each of the plurality of precoding matrices includes a plurality of rows, the plurality of rows, each corresponding to given to one of the plurality of transmit antenna ports, the plurality of rows and the corresponding ones of the plurality of transmit antenna ports being grouped into a plurality of groups, and each of the plurality of groups including at least two rows of the plurality of rows, and each of the plurality of rows in each of the plurality of precoding matrices includes at least one element defined by a first precoding and a second precoding, the first precoding being identically defined in each. of the plurality of groups, and the second precoding being defined differently in each of the plurality of groups.
[0011]
11. Wireless communication method according to claim 10, characterized in that it further comprises: generating a CQI which is the information corresponding to a coding rate and a modulation scheme so that a reception quality assuming the precoding matrix which is selected from the plurality of precoding matrices meets a required quality.
[0012]
12. Wireless communication method performed by a base station (200) having a plurality of transmit antenna ports configured to communicate with a mobile terminal (300), the wireless communication method characterized in that it comprises: generating a plurality of channel state measurement reference signals that are mutually known between the base station (200) and the mobile terminal (300); receiving feedback information corresponding to a precoding matrix that is selected from a plurality of precoding matrices, the feedback information being based on the plurality of reference signals and the plurality of precoding matrices being predefined ; and performing precoding processing for the mobile terminal (300) based on the feedback information, wherein each of the plurality of reference signals is transmitted using different from the plurality of transmit antenna ports, the plurality of reference signals are orthogonalized, the feedback information includes information indicating a precoding matrix that is selected by the mobile terminal (300) from a plurality of precoding matrices, the plurality of precoding matrices being predefined, each one of the plurality of precoding arrays includes a plurality of rows, the plurality of rows each corresponding to one of the plurality of transmit antenna ports, the plurality of rows and the corresponding ones of the plurality of transmit antenna ports being grouped into a plurality of groups, and each of the plurality of groups including at least two rows of the plurality of rows, and each of the plurality of rows in each of the plurality of precoding matrices includes at least one element defined by a first precoding and a second precoding, the first precoding being identically defined in each one of the plurality of groups, and the second precoding being defined differently in each of the plurality of groups.
[0013]
13. Wireless communication method according to claim 12, characterized in that it further comprises: receiving a CQI; controlling an encoding rate for the mobile terminal (300) based on the CQI; and controlling a modulation scheme for the mobile terminal (300) based on the CQI, where the CQI is the information corresponding to the coding rate and the modulation scheme, so that a reception quality assuming the precoding matrix which is selected from the plurality of precoding matrices meets a required quality.

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法律状态:
2020-08-18| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04W 24/10 , H04B 7/04 , H04J 99/00 , H04W 16/28 Ipc: H04W 24/10 (2009.01), H04L 1/06 (2006.01), H04L 1/ |

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2020-08-18| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-04-06| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-05-18| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 16/09/2010, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF |

优先权:

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申请号 | 申请日 | 专利标题

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JP2009230623A|JP5149257B2|2009-10-02|2009-10-02|Wireless communication system, communication apparatus, and wireless communication method|

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JP2009-230623|2009-10-02|

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PCT/JP2010/066085|WO2011040258A1|2009-10-02|2010-09-16|Wireless communication system, communication apparatus, wireless communication method and terminal apparatus|

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