csi-rs signaling method and base station apparatus

专利摘要:
CSI-RS SIGNALING METHOD AND BASE STATION APPARATUS. To signal CSI-RS location indices indicative of CSI-RS location positions in a resource block with high efficiency, a CSI-RS signaling method is characterized by having the steps of locating a CSI-RS which is a reference signal for downlink channel estimation in CSI-RS resources reserved to transmit CSI-RS, generate a CSI-RS location index indicative of a CSI-RS location position located in the resources for CSI-RS , in the CSI-RS location index, an index pattern varies corresponding to the number of CSI-RS ports so that an index pattern of the relatively low number of CSI-RS ports is a subset of an relatively high number of CSI-RS ports, and transmit the generated CSI-RS location index to a mobile terminal device.
公开号:BR112013003485A2
申请号:R112013003485-8
申请日:2011-08-16
公开日:2020-08-04
发明作者:Tetsushi Abe；Nobohiko Miki；Yosuke Ohwatari
申请人:Ntt Docomo, Inc；
IPC主号:

专利说明:

Invention Patent Descriptive Report for "CSI-RS SIGNALING METHOD AND BASE STATION APPARATUS". - Field of Art The present invention relates to a signaling method of CSIRSea a base station apparatus. Background of the Technique In UMTS networks (Universal Mobile Telecommunications System), with the purpose of improving spectral efficiency and further improving data rates through the adoption of HSDPA (High Speed Downlink Packet Access) and HSUPA (Access by Packets - High Speed Uplink), is performed by exploring the maximum characteristics of the system based on W-CDMA (Multiple Access. by Broadband Code Division). For the UMTS network, in order to further increase high-speed data rates, provide low delay and the like, Long Term Evolution (LTE) has been studied (Non-patent document 1).
In the 3G system, a fixed band of 5 MHz is used substantially and it is possible to obtain maximum transmission rates of approximately 2 Mbps on the downlink. Meanwhile, in the system, using variable bands ranging from 1.4 MHz to 20 MHz, it is possible to obtain transmission rates of a maximum of 300 Mbps on the downlink and approximately 75 Mbps on the uplink. Additionally, in the UMTS network, for the purpose of further increasing bandwidth and high speed, LTE successor systems have been studied (for example, Advanced LTE (LTE-A)). According to the above, it is expected that such a plurality of mobile communication systems will coexist in the future and it is conceivable that configurations (base station apparatus, mobile handset and the like) capable of supporting the plurality of systems are necessary.
In the downlink of LTE systems (LTE systems), CRS (Common Reference Signal), that is, a reference signal common to the cell is defined. CRS is used in demodulation of transmission data and is also used in downlink channel quality measurement (CQI: Channel Quality Indicator) for programming and adaptive control and measurement (mobility measurement) of path states of downlink propagation in a medium way to search and - automatic cell change.
Meanwhile, in the downlink of systems (LTE-A systems) Advanced LTE is defined a CSI-RS (Reference Signal of State of Information of Channel) dedicated to the measurement CQ!, In addition to the CRS.
Prior Art Documents Non-patent document: [Non-patent document 1] 3GPP, TR25.912 (V7.1.0), "Feasibility study for Evolved UTRA and UTRAN", September 2006 f Description of the Invention Problems to be solved by the Invention Furthermore, with the introduction of CSI-RS, CSI-RS location configurations (CSI-RS locations) are studied and since the number of CSI-RSs varies according to the number of CSI ports -RS, location patterns vary accordingly.
The present invention was made taking into account such an aspect and it is an objective of the invention to provide a CSI-RS signaling method and base station apparatus to signal CSI-RS location indices indicative of CSI-RS location positions in a resource block with high efficiency.
Means to Solve the Problem A base station device of the invention is characterized by having a location section that locates a CSI-RS which is a reference signal for estimating downlink channel in resources for CSI-RS reserved to transmit o CSI-RS, an index generation section that generates a CSI-RS location index indicative of a CSI-RS location position located in the CSI-RS resources in the location section and, at this point, generates indexes different CSI-RS locations that correspond to the number of CSI-RS ports so that an
index of the relatively low number of CSI-RS ports is a subset of õ a standard of indexes of the relatively high number of CSI-RS ports and a - transmission section that transmits the CSI-RS location indexes generated in the generation section index for a mobile terminal device. Advantageous Effect of the Invention According to the invention, it is possible to provide a CSI-RS signaling method and base station apparatus for signaling CSI-RS location indices in a resource block with high efficiency.
Brief Description of the Drawings Figure 1 contains explanatory views of a CRS de-location configuration; Figure 2 is an explanatory view of a CSI-RS location configuration; Figure 3 contains explanatory views to explain a process for generating CSI-RS location indexes; Figure 4A contains views that show a specific example in which CSI-RS location indices are determined by applying the method as shown in Figure 3A; Figure 4B contains views that show a specific example in which CSI-RS location indices are determined by applying the method as shown in Figure 3B; Figure 4C contains views showing a specific example of CSI-RS location indices determined with a portion of modified CSI-RS location indices; Figure 5 is an explanatory view of a method for measuring CQls of adjacent cells; Figure 6 contains explanatory views of silence in COQ measurement! the use of CSI-RSs; Figure 7 contains explanatory views of a method of signaling - silence silence of resources; Figure 8 is a table that illustrates the relationship between the resource silence signaling method and the number of signaling bits;
Figure 9 is an explanatory view of a configuration of a: mobile communication system; + Figure 10 is an explanatory view of an entire configuration of a base station device; Figure 11 is an explanatory view of an entire configuration of a mobile terminal device; Figure 12 is an explanatory view of functional blocks for the base station apparatus to make the mobile terminal apparatus measure CQ! I; Figure 13 is an explanatory view of functional blocks for the mobile terminal device to measure QC !; Figure 14 is a table showing the correspondence relationship between a CSI-RS transmission cycle and subframe deviation. Best Mode for Carrying Out the Invention Before describing a high efficiency signaling method of CSI-RS according to the claim, first CRS (Common Reference Signal) defined in the downlink of LTE and CSI-RS (Signal Signal) systems are described. Reference of Channel State Information) from which the application to the downlink in LTE-A systems was accepted.
Figure 1 contains views to explain a CRS configuration. Figure 1 contains explanatory views for a CRS location configuration. CRS is assigned to all resource blocks and all subframes.
The CRS is transmitted to a mobile terminal device with a predetermined frequency, time, transmission power and phase as a common cell reference signal. The frequency and transmission power of the CRS are recognized on the mobile terminal device side by a cell ID (Area Identifier) and a broadcast signal, described below. CRS is substantially used in demodulating user data and downlink channel measurement on the mobile terminal device. Channel measurement using CRS includes downlink channel quality measurement (CQI: Channel Quality Indicator) for programming and adaptive control and measurement (mobility measurement) of "downlink propagation path states in one way average for cell search and automatic change As shown in Figure 1A, the CRS is located so as not to overlap user data and DM-RS (Demodulation Reference Signal) on a resource block specified in LTE. is comprised of 12 contiguous subcarriers in the frequency domain and 14 contiguous symbols in the direction of the time axis.Additionally, as shown in Figure 1B, the CRS is shifted in the frequency domain to each cell and is capable of being defined that a collision of - simultaneous CRSs does not happen between adjacent cells. In an example as shown in Figure 1, the CRS in a C2 cell is displaced by Y a subcarriers in the frequency domain. went in reference to the CRS in a cell 1 and mapped.
The CRS is identified by parameters of position, sequence and transmission power. Among the parameters, the position of the CRS is associated with a cell ID. In other words, the position of the CRS shifted in the frequency domain is determined by the cell ID and, therefore, the mobile device recognizes the cell ID of the existing cell and therefore identifies the CRS. In addition, the CRS sequence is associated with the cell ID and the transmit power is not reported by a broadcast signal. In addition, the cell ID to identify the position and sequence of the CRS is recognized by the mobile terminal device by a cell search.
The CSI-RS configuration considered in the downlink of LTE-A systems is described below. CRS is assigned to all resource blocks and all subframes and CSI-RS is assigned at predetermined intervals. Additionally, considering the transmission and reception of data channel signals by the COMP, the CSI-RS is designed taking into account the use of CQI measurement not only from a server cell, but also from adjacent cells. Meanwhile, according to CRIS, the CSI-RS is identified by parameters of position, sequence and transmission power. Among the parameters, the position of the CSI-RS is capable of being notified by the use of a diffusion signal from each cell (RRC signaling). . When the CSI-RS position is not notified by the use of a broadcast signal, the mobile terminal device receives the broadcast signal from the base station apparatus and is therefore able to identify the position CSI-RS.
Figure 2 is a view to explain a CSI-RS location configuration. The CSI-RS is located so as not to overlap user and DM-RS data in a resource block specified in the LTE. For 8 CSI-RSs (in the case where the number of CSI-RS ports is "8" which corresponds to 8 antennas), the CSI-RS configuration as shown in Figure 2 is accepted. From the point of view of suppressing PAPR, according to resources allowed to transmit the CSI-RS, two elements of adjacent resources in the direction of the time axis are assigned as a set. Two adjacent resource elements in the direction of the time axis are always used as a set and, therefore, it is desired that an index (CSI-RS location index) is assigned to a set of two resource elements.
In the CSI-RS configuration as shown in Figure 2, 40 resource elements are reserved as CSI-RS transmission resources. Since an index is assigned to a set of two resource elements as described above, the CSI-RS location positions are capable of being indicated by a maximum of 20 index numbers from 0 to 19 in a resource block all.
When the number of CSI-RS ports is "8", 8 elements of resources are assigned to CSI-RSs out of 40 elements (No. 0 to No. 19). In the CSI-RS configuration as shown in Figure 2, it is possible to select any of 5 patterns (indexes from 0 to 4) shown in 8 CSI-RS in Figure 4A (a). The resource elements that form a pattern are provided with the same index. The index that is then given to resources to transmit the CSI-RS is called the CSI-RS location index. In an example in Figure 4A (a), 8 resource elements (# 0 and # 1 in Figure 2) (# 6 and # 7 in Figure 2) are provided with the CSI-
RS "0". When the number of CSI-RS ports is "8", 3 bits are required & to signal location indexes from CSI-RS # 0 to # 4. . When the number of CSI-RS ports is "4", 4 resource elements are assigned to CSI-RSs out of 40 resource elements. It is possible to select any one of 10 patterns (indexes O to 9) shown in 4 CSI-RS in Figure 4A (b). When the number of CSI-RS ports is "4", 4 bits are required to signal the location indexes of CSI-RS # 0 to #.
When the number of CSI-RS ports is "2", 2 resource elements are assigned to CSI-RSs out of 40 resource elements (nº0 to: nº19). It is possible to select any of 20 patterns (indexes from 0 to 19) shown in 2 CSI-RS in Figure 4A (c). When the number of CSI-RS ports is "2", 5 bits are required to signal location indexes from CSI-RS # 0 to # 19.
In order to support all CSI-RS port numbers from "2", "4" and "8" to signal CSI-RS location indexes, it is necessary to provide index tables to define location indexes for CSI-RS for each of the CSI-RS port numbers of "2", "4" and "8", as shown in Figure 4A.
Therefore, as a result of studying methods for signaling CSI-RS location indexes efficiently, the inventors of this invention have found that it is possible to generate CSI-RS location indexes without having index tables for the numbers of CSI-RS ports of "4" and "2" by generating CSI-RS location indexes from the smallest number of CSI-RS ports using CSI-RS location indexes from the largest number of ports of CSI-RS so that an index pattern of the relatively smaller number of CSI-RS ports is a subset of an index pattern of the relatively larger number of CSI-RS ports and that it is therefore possible to signal indices of CSI-RS localization with high efficiency and - arrived at the invention.
Figures 3A and 3B are conceptual diagrams of the CSI-RS location indexing method according to the invention.
In the Figures, by using 2x2 resource elements (hereinafter referred to as a REB: Resource Element Block) as a unit,. two REBs for CSI-RS are shown. A REB for CSI-RS is comprised of higher and lower resources.
Ss Figure 3A is a conceptual diagram of the generation concept and signaling method of CSI-RS location indices. Figure 3A shows regions of 4 front and rear symbols that include 2 symbols assigned to REB for CSI-RS. When the number of CSI-RS ports is "8" (8 antennas), the same CSI RS location index "n" is assigned to two REBs (total of 8 resource elements) for CSI-RS. S When the number of CSI-RS ports is "4" (4 antennas), the CSI-RS location indices are designed to be uniquely determined by an index determination rule from the index "n "of the number of CSI-RS ports of" 8 "which is greater. In this example, the same index determination rule is applied to two REBs for CSI-RS. More specifically, within a REB for CSI-RS, CSI-RS location indexes assigned to the higher resources are assigned "2n" which is [a value obtained by duplicating] the CSI-RS location index "n" of the number of CSI-RS ports of "8". The lower resources are assigned "2n + 1" which is [a value obtained by adding "1" to the value obtained by duplicating "the CSI-RS location index" n "of the number of CSI-RS ports of" 8 ". CSI-RS location indexes are assigned to the other CSI-RS REB by the same rule.
When the number of CSI-RS ports is "2" (2 antennas), CSI-RS location indices are determined by the index determination rule from CSI-RS location indices of the case where the number - CSI-RS port ro is "4". More specifically, for a REB for CSI-RS with higher frequency indices (the frequency index increases as the REB is present in a higher position in the Figure in Figure 3A), the upper resources are assigned to "4n" which is [ a value obtained by doubling] the corresponding CSI-RS location index "2n" out of the number of CSI-RS ports of "4". In addition, lower resources are assigned "4n + 2" which is [a value obtained by duplication] the index of: location of CSI-RS corresponding to the number of ports of CSI-RS of. "4". Meanwhile, for a REB for CSI-RS with lower rates of lower frequencies, higher resources are assigned "4n + 1" which is [a value obtained by adding "1" to the value obtained by duplicating] the index of CSI-RS location "2n" corresponding to the number of CSI-RS ports of "4". In addition, the lower resources are assigned "4n + 3", ie [a value obtained by adding "1" to the value obtained by duplication] the corresponding CSI-RS location index "2n + 1" of the number of CSI-RSde "4".
- Figure 3B is a conceptual diagram of another generation concept and signaling method for CSI-RS location indices. The whole method is the same as the signaling method as shown in Figure 3A in relation to the determination of CSI-RS location indexes in the case where the number of CSI-RS ports is "4" from the location indexes of CSI-RS of the number of CSI-RS ports of "8" which is greater according to an index determination rule. In this method of generating Index and signaling, for one of the REBs for CSI-RS, the CSI-RS location indices assigned to higher resources are assigned "n" which is [the same value, without any modification] the same than the CSI-RS location index "n" of the CSI-RS port number of "8". Lower resources are assigned "n + N" which is [a value obtained by adding N to the same value] which is the same as the CSI-RS location index "n" of the number of CSI-RS ports for "8". In this document, N represents the maximum value (that is, 10/5) of the case where the number of CSI-RS ports is 4/8. The location indexes of CSI-RS are assigned to the other REB for CSI-RS by the same rule. The CSI-RS location indices for the case where the CSI-RS port number is "2" are determined from the CSI-RS location indices for the case where the CSI-RS port number is "4" according to an index determination rule. More specifically, for a REB for CSI-RS of higher frequency indices, higher resources are assigned "n" which is [the same value, without any modification] the same as the corresponding CSI-RS location index "n" of the number of - CSI-RS ports of "4". In addition, lower resources are assigned "n + N" which is [the same value, without any changes] as the CSI-RS location index "n + N" corresponding to the number of CSI-RS ports of "4 ". Meanwhile, for a REB for CSI-RS of lower frequency indices, higher resources are assigned "n + 2N" which is [a value obtained by adding 2N to the same value] the same as the CSI- RS "n" corresponding to the number of CSI-RS ports of "4". In addition, "finally, lower resources are assigned" n + 3N "which is [a value obtained by adding 2N to the same value] the same as the location index of
CSI-RS "n + N" corresponding to the number of CSI-RS ports of "4". "After determining the CSI-RS transmission positions in a resource block, the base station device determines the CSI-RS location indexes of the CSI-RS transmission positions determined by applying the method as shown in Figure 3A.
In other words, in the case of 8 CSI-RSs, where the number of CSI-RS ports is the maximum, the device refers to the index pattern defined previously as shown in Figure 4A (a) and generates the index of CSI-RS location assigned to resources.
Meanwhile, in the case of 4 CSI-RSs or 2 CSI-RSs where the number of CSI-RS ports is relatively low, by applying the method as shown in Figure 3A, the device generates CSI-RS location indexes such that the index pattern of the relatively small number of CSI-RS ports is a subset of the index pattern of the relatively high number of CSI-RS ports.
In accordance with the above, in accordance with the CSI-RS signaling method of the invention, provided that the apparatus retains the CSI-RS location index table of the number of CSI-RS ports of "8" which is a basic index standard, it is possible to determine CSI-RS location indices associated with the CSSI-RS port numbers that are "4" and "2" and the need is eliminated to retain the location index index table CSI-RSs of the CSI-RS port numbers that are "4" and "2". Additionally, as compared to the case of
: supply all the resource elements in a resource block with indices to signal, the maximum value of the indices can be decreased and it is therefore possible to reduce the signal overload. Figure 4A shows a specific example for determining CSI-RS location indices of CSI-RS port numbers that are "4" and "2" by applying the method as shown in Figure 3A. CSI-RS location indexes of 8 CSI-RSs where the number of ports is the maximum are determined in advance and are retained in the form of a table or similar. Based on the 8 CSI-RSs index standard, the CSI-RS port number indices that are "4" and "2" are calculated - according to the index determination rule as shown in Figure 3A.
It is As shown in the figure, in a resource block, it is assumed that six REBs (hereinafter referred to as 1st to 6th REBs) for CSI-RS are located in the 9th and 10th symbol regions, two REBs (hereinafter hereinafter referred to as 7th and 8th REBs) for CSI-RS are located in the 5th and 6th symbol regions and that two REBs (hereinafter, referred to as 9th and 10th REBs) for CSI-RS are located in the 12th and 13th yes regions - cake.
In the case of 8 CSI-RSs, the CSI-RS location index "0" is assigned to the 1st and 4th REBs located in the 9th and 10th symbol regions, the CSI-RS location index "1" is assigned to the 2nd and 5th REBs located in the same symbol regions and, in addition, the CSI-RS "2" location index is assigned to the remaining 3rd and 6th REBs. Meanwhile, the CSI-RS location index "3" is assigned to the 7th and 8th REBs located in the 5th and 6th symbol regions and the CSI-RS location index "4" is assigned to the 9th and 10th located REBs in the 12th and 13th symbol regions. The CSI-RS location index standard of 8 CSI-RSs is retained in advance.
In the case of 4 CSI-RSs, the CSI-RS location indices are determined based on the CSI-RS location indices assigned to REBs of 8 CSI-RSs in which the number of ports is greater than in 4 CSI-RSs
RSs. In the case of 4 CSI-RSs, different indexes of CSI-RS 7 location are attributed to higher and lower resources in a REB and in. a set of REBs (for example, 1st REB and 4th REB) assigned to the same CSI-RS location index in 8 CSI-RSs, the same CSI-RS location indexes (2n = 0, 2n + 1 = 1 ) are also assigned to 4 CSI-RSs. In the case of 2 CSI-RSs, the CSI-RS location indices are determined based on the CSI-RS location indices assigned to the REBs of 4 CSI-RSs in which the number of ports is greater than in 2 CSI-RSs . In the case of 2 CSI-RSs, different indexes of CSI-RS location are attributed to higher and lower resources in a REB and, also, in a set of REBs (for example, the 1st REB and 4th REB) attri - added to the same location indexes as CSI-RS in 4 CSI-RSs, different location indexes are assigned. For example, in the 1st REB, "4n = 0" is assigned to higher resources and "4n + 2 = 2" is assigned to lower resources. In the 4th REB, "4n + 1 = 1" is assigned to higher resources and "4n + 3 = 3" is assigned to lower resources.
Figure 4B shows a specific example for determining CSI-RS location indices of the CSI-RS port numbers that are "4" and "2" by applying the method as shown in Figure 3B. CSI-RS location indexes of 8 CSI-RSs where the number of CSI-RS ports is the maximum are determined in advance and are retained in the form of a table or similar. Based on the location indexes of 8 CSI-RSs, indexes of the CSI-RS port numbers that are "4" and "2" are calculated according to the index determination rule as shown in —Figure3B. 8 CSI-RSs in a resource block is the same as the 8 CSI-RS configuration as shown in Figure 4A. In the case of 4 CSI-RSs, the CSI-RS location indices are determined based on the CSI-RS location indices assigned to the REBs of 8 CSI-RSs. In the case of 4 CSI-RSs, different indexes of CSI-RS location are attributed to higher resources and lower resources in a REB and a set of REBs (for example, 1st REB and 4th REB) assigned to the same index location of CSI-RS in 8 CSI-RSs, the same
CSI-RS location indices (n = 0, n + N = 5) are also assigned to 4 O stresses x In the case of 2 CSI-RSs, CSI-RS location indices are determined based on the location indices of CSI-RS assigned to —REBs4 CSI-RSs.
In the case of 2 CSI-RSs, different CSI-RS location indices are attributed to higher and lower resources in a REB and also in a set of REBs (for example, 1st REB and 4th REB) assigned to the same indexes location of CSI-RS in 4 CSI-RSs, different location indexes are assigned.
For example, in the 1st REB, "n = 0" is assigned to higher resources, and "n + N = 5" is assigned to lower resources.
In the 4th REB, "n + 2N = 10" is assigned to higher resources, and "n + 3N = 15" is assigned to lower resources. "Figure 4C shows a specific example of determining CSI-RS location indices by further modifying a portion of the initial CSI-RS location indices calculated by applying the method as shown in Figure 3A.
In the first stage, the location indexes of 4 CSI-RSs are calculated according to the index determination rule as shown in Figure 3A based on the location indexes of 8 CSI-RSs with the maximum number of doors.
In the second stage, among the location indexes calculated in the first stage, location indexes from the 1st to the 6th REBs located in the 9th and 10th symbol regions are relocated to be located equally in the frequency index orientation in the ascending numerical order .
In the third stage, the location indexes of 2 CSI-RSs are calculated according to the index determination rule as shown in Figure 3A.
In the fourth stage, among the location indexes calculated in the third stage, location indexes from the 1st to the 6th REBs located in the 9th and 10th symbol regions are relocated to be located equally in the frequency index orientation in the ascending numerical order.
For channel estimation using CSI-RS, the CSI-RS location indexes determined as described above are signaled on the downlink as one of the CSI-RS parameters.
At this point, the CSI-RS parameters include, preferably-. a transmission cycle (duty cycle: 5, 10, 20msec, ...) of. CSI-RS, transmission power and the number of CSI-RS ports. The CSI-RS parameter can include deviation information (subframe deviation) as additional information to identify positions of CSI-RSs. Since the deviation information (subframe deviation) is closely related to the CSI-RS transmission cycle, it is preferable to notify in the form of the combination of the deviation information and the transmission cycle. The mobile terminal device receives the CSI-RS parameters mentioned in the downlink to demodulate, thus acquiring it. location indexes of CSI-RSs, receives the CSI-RSs in resources indicated by the location indexes of CSI-RS and is able to perform E channel estimation from the reception and CSI-RS results. As described above, CSI-RS parameters (CSI-RS location indices) are included in a broadcast signal and are reported to the mobile terminal device. Since the CSI-RS location indexes are not packaged with the cell ID, the design of the cell ID is not dependent on a CSI-RS location setting. In other words, the cell ID is determined based on parameters of the CRS and similar location configuration, but it is not further complicated by considering CSI-RS parameters. According to the above, the configuration to identify CSI-RSs positions by diffusion is efficient in the case of giving priority to the versatility of the project in the system and the like.
However, the present invention does not exclude combinations with the notification method in which CSI-RS location indices are associated with the cell ID. The invention can enable switching between the method (indirect signaling method) for packaging CSI-RS location indexes with the cell ID for signaling and the method (explicit signaling method) for including CSI- location indexes RS in a broadcast signal to signal in the same method as the CRS index notification method as described above. In the case of application of the hybrid method to enable the indirect signaling method and the explicit signaling method for switching, RRC signaling is performed for + identification information to indicate whether the method is the indirect signaling method or the of explicit signaling.
Additionally, when performing COMP (Coordinated Multiple Point), when the same cell ID is used among a plurality of cells, CSI-RSs collide with each other between cells in the location of CSI-RSs in resources for the cell ID. According to the above, in the case of such a system, CSI-RSs are located in resources for dissemination. Additionally, it is possible to use separately so that the CSI-RSs are located in resources for the cell ID in the macrocell while it is located in resources for diffusion in a picocell.
'Additionally, CSI-RS differs from CRS and is designed considering not only the serving cell, but also the adjacent cells. The reason why channel quality of a plurality of cells is then measured is to consider transmission and reaction of user data by CoMP. A mobile terminal device transmits the measured CQIs to the base cell apparatus of the server cells and base station apparatus of the adjacent cells as feedback. The QC! transmitted to the base station device as feedback is used in the determination of parameters (for example, MCS: Coding and Modulation Scheme) in the transmission of user data to the mobile terminal device.
In this case, CSI-RS parameters are communicated between cells, and position parameters, transmission power and the like of adjacent cell CSI-RSs are transmitted from the server cell to the mobile terminal device. In this document, QC measurement! of adjacent cells will be described with reference to Figure 5. Figure 5 is an explanatory view of a method of measuring the CQlIs of adjacent cells according to this embodiment of the invention.
As shown in Figure 5, a base station device 20A installed in the server cell is connected to base station devices 20B and 20C installed in adjacent cells to be able to transmit and receive CSI-RS parameters. The way of connecting between the Í base stations 20A, 20B and 20C is not particularly limited and can be either wired or wireless. In this system, each of the base station apparatus 20B and 20C in the adjacent cells transmits position parameters (location indices, subframe deviation) of CSI-RSs, transmission cycle, sequence, transmission power and the like of the CSI-RS to the base station apparatus 20A of the server cell. The base station apparatus 20A generates a broadcast signal that includes parameters of the CSI-RSs received from the base station apparatus 20B and 20C and CSI-RSs parameters of the cell of the apparatus 20A to transmit to the mobile terminal apparatus 10 .
The CSI-RS parameters in the server cell include the CSI-RS position, CSI-RS transmission cycle (Duty Cycle), deviation (subframe deviation) to an initial position of the CSIRS transmission cycle, sequence and power transmission. The CSI-RS parameters in the adjacent cell include the adjacent cell ID and the position, sequence and transmission power of the CSI-RS. By using the diffusion signal from the server cell, the mobile terminal device 10 is able to identify the position, sequence and transmission power of the CSI-RS of the adjacent cell, and is therefore capable of measuring the CQ! I of the cell adjacent.
In addition, when measuring CQI using CSI-RS in order to improve the accuracy of QC measurement! due to interference from adjacent cells, silencing is efficient. Silencing is accomplished by defining resources in which the CSI-RS is located in an adjacent cell in blank (null) resources.
Silencing in CQI measurement using CSI-RSs will be described below with reference to Figure 6. Figure 6 is an explanatory view of silencing in QC measurement! by the use of CSI-RSs in accordance with this embodiment of the invention. In addition, in Figure 6, it is assumed that —C1 cell, C2 cell, and C3 cell are adjacent to each other. In addition, in the following description, the description is given while assuming that the resources in which CSI-RSs are located are CSI-RS resources.
. Figure 6A shows a state in which silencing is not performed. As shown in the Figure, in the state in which silencing is not performed, in a downlink resource block of cell C1, user data is located in resources that correspond to deCSIRS resources of adjacent cells C2 and C3. Additionally, in a downlink resource block of cell C2, user data is located in resources that correspond to CSI-RS resources of adjacent cells C1 and C3. In addition, in a block of link resources descending from cell C3, user data is located in resources that correspond to CSI-RS resources of adjacent cells C1 and C2. These items: user data are components of CSI-RS interference in each cell and become a factor to degrade channel quality estimation accuracy in the mobile terminal device.
Figure 6B shows a state in which silencing is performed. In silencing, to suppress deterioration of channel quality estimation accuracy caused by the location of user data, resources that correspond to adjacent cell CSI-RS resources are defined in blank resources in which the user data they are not located. As shown in Figure 6B, in the downlink resource block of cell C1, the resources that correspond to CSI-RS resources of cells C2 and C3 are defined as blank resources. Additionally, in the downlink resource block of cell C2, resources that correspond to CSI-RS resources of cells C1 and C3 are defined in blank resources. Furthermore, in the downlink resource block of cell C3, resources that correspond to CSI-RS resources of cells C1 and C2 are defined as blank resources.
Therefore, by defining resources that correspond to CSI-RS resources of adjacent cells in blank resources, it is possible to eliminate user data from adjacent cells from the CSI-RS interference components and improve the estimation accuracy of channel quality on the mobile terminal device. However, in the case of silencing, since the data channel is silenced to reduce inter-
transference to adjacent cells, it is necessary to notify users that: they connect the cell about which position is silenced. - «The mobile terminal device recognizes the presence or absence of silencing based on position information of blank resources notified from the base station device, recognizes that data in one position is not transmission and therefore , recognizes the number of resource elements assigned to data. Blank resource position information is notified from the base station device to the mobile terminal device — broadcast channel. For example, the base station handset defines pattern indices indicative of CSI-RSs location patterns in a resource block by the rule mentioned above and notifies the terminal device It is mobile from pattern indices as the position information of resources in White.
Three ways of reporting silence methods will be described below with reference to Figures 5A to 7C. Figure 7A is an explanatory view of a bitmap-based muting notification method. The method of notification of bitmap-based muting features as shown in the Figure is to signal muting position information of a bitmap shape that associates the CSI-RS Location Index numbered by the method mentioned above with the presence or absence silencing in one-to-one correspondence. The case where the CSI-RS port number is "8" will be described specifically as an example.
In the specific example as shown in Figure 7A, in the case of 8 CSI-RSs, the case is shown that the CSI-RS is transmitted in resources of the CSI-RS location indices of "0", "2" and "3" and what features of the CSI-RS location indexes of "1" and "4" are silenced. In this case, the association with CSI-RS location indexes [0, 1, 2, 3, 41, [0, 1, O, 0.1], is signaled as the bitmap information. In bitmap information, the muting position is set to "1" and the position that is not muted is set to "O".
Such a method of notification of bitmap based silencing features is capable of supporting several muting patterns and high: update flexibility. Figure 7B is an explanatory view of a tree-based mute feature notification method. The tree-based mute feature notification method as shown in the Figure is to signal a mute start feature and an end mute feature by using CSI-RS location indexes numbered by the mentioned method. above. In the specific example as shown in Figure 7B, in the case of 8 CSI-RSs, the case is shown that the CSI-RS is transmitted in resources of the CSI-RS location indices of "0", "3 "and" 4 "and which Y features of the CSI-RS location indexes of" 1 "and" 2 "are silenced. In this case, the start silencing feature is indicated by the CSI-RS location index "1" and the end silencing feature is indicated by the CSI-RS location index "2".
In such a method of notification of a tree-based silencing resource, the effect of reducing the number of signaling bits is greater as the number of contiguous resources targeted for consecutive silencing is greater.
Figure 7C is an explanatory view of a number based silencing feature notification method. The number based silencing feature notification method as shown in the Figure is to signal the number of contiguous silencing target resources The silencing start position is defined for CSI-RS location index "0" . In addition, as long as the start position of silence is fixed or semi-fixed, the position is not limited to the smallest number of "O", and can start from "1" or another number.
In the specific example as shown in Figure 7C, in the case of 8CSIRSs, the case is shown that the CSI-RS is transmitted in resources of the CSI-RS location indexes of "2", "3" and "4" and which CSI-RS location index features of "0" and "1" are silenced. In this case, since two contiguous REBs from indexes "1" to "2" are targeted for silencing, the number of silencing REBs is two (= 2). .- In such a number-based muting feature notification method, since it is only necessary to signal the number of contiguous silencing REBs, it is possible to further reduce the number of signaling bits.
Figure 8 is a table showing the number of cue bits, the number of rate matching patterns and the number of RE mapping patterns associated with the three silencing feature notification methods mentioned above. Experiment calculation is done: on each of the items such that the number of signaling bits and the number of patterns for each of 2 CSI-RSs, 4 CSI-RSs and 8 CSI-RSs. The number-based muting notification method is the method with the least number of signaling bits, but the number of RE mapping patterns is the least and therefore it is understood that this method has no flexibility.
Additionally, the tree-based mute feature notification method (Figure 7B) and the number-based mute feature notification method (Figure 7C) are highly compatible with CSI-RS location indexes numbered by methods as shown in Figures 4A and 4B. For example, in the case of 4 CSI-RSs as shown in Figure 4A (b), the CSI-RS location indices are aligned in ascending numerical order. Additionally, in the case of 2 CSI-RSs as shown in Figure 4A (c), even numbers and even numbers are separated, but the CSI-RS location indices are aligned in ascending numerical order. According to the tree-based silencing feature notification method (which includes based on number), by combining with the method of assigning CSI-RS location indices by contiguous numbers, it is possible to designate silencing sequentially from the smallest number.
As shown in Figure 7A, for example, in cell C1, the base station device notifies the mobile terminal device of CSI-RS location indexes "0", "2" and "3" as the position information of the 7 CSI-RSs and indexes "1" and "4" as the resource position information. blank, by any of the signaling methods as shown in Figures 7A to 7C. The mobile terminal device is notified —of blank resources and is therefore able to demodulate user data while eliminating the effect of blank resources. Therefore, according to the first silencing notification method, it is possible to notify the mobile terminal device of blank resources with the simplified configuration.
In addition, this modality describes a configuration in which: the base station apparatus notifies the mobile terminal apparatus of index patterns as blank resource position information, but the invention is not limited to this configuration. The blank resource position information is only needed as information to enable the blank resource position to be identified and, for example, it can be address information in a resource block. In addition, when pattern indices indicative of a resource location pattern for the cell ID are defined in a resource block, such as a setting can be adopted so that the cell ID is notified as the blank resource position information. A radio communication system according to the mode of the invention will be described specifically in this document. Figure 9 is an explanatory view of a system configuration of the radio communication system according to this modality. In addition, the radio communication system as shown in Figure 9 is a system that includes the LTE or SUPER 3G System, for example. In the radio communication system, carrier aggregation is used to integrate a plurality of base frequency blocks with the LTE System's system band as a unit. In addition, the radio communication system can be called IMT-Advanced or can be called 4G. As shown in Figure 9, the radio communication system 1 includes base station handsets 20A, 20B and 20C and a plurality of
of mobile terminal devices 10 (101, 102, 103, ... 10n, n is an integer It is where n> 0) that communicates with the base station devices 20A, 20B and 20C x and is comprised of them. Base station devices 20A, 20B and 20C are connected to an upper station device 30, and the upper station device 30 is connected to a core network 40. Mobile terminal devices 10 are capable of communicating with base station 20A, 20B and 20C in cells C1, C2 and C3, respectively. In addition, for example, the upper station apparatus 30 includes an access gateway apparatus, radio network controller (RNC), mobility management entity (MME), etc., but is not limited to them.
Each of the mobile terminal devices (101, 102, 103, ...., 10n) includes an LTE Terminal and an LTE-A Terminal and is described as a mobile terminal device 10 unless otherwise specified in following description. Additionally, for convenience in the description, the description is given while assuming that the equipment that performs radio communications with the base station handsets 20A, 20B and 20C is the mobile handset 10 and, more generally , the device can be a user device (UE) that includes mobile terminal devices and fixed terminal devices.
In the radio communication system 1, as a radio access scheme, OFDMA (Orthogonal Frequency Division Multiple Access) is applied to the downlink while SC-FDMA (Multiple Access by Single Carrier Frequency Division) is applied to the upstream link, but the uplink radio access scheme is not limited to it. OFDMA is a multiport transmission scheme to divide a frequency band into a plurality of narrow frequency bands (subcarriers), and to map data on each subcarrier to carry out communications. SC-FDMA is a single carrier transmission scheme for dividing the system band into bands that are comprised of a single block or consecutive blocks of resources for each terminal so that the plurality of terminals use mutually different bands and therefore, it reduces interference between the terminals.
: Described in this document are communication channels: in the LTE system. + Downlink communication channels have PDS-CH (Physical Downlink Shared Channel) as a downlink link data shared between mobile terminal devices 10 and L1 / L2 downlink control channels (PDCCH, PC- FILE, PHICH). The transmission data and further control information are transmitted on the PDSCH. Programming information from PDSCH and PUSCH and the like is transmitted on the PDCCH. The number of OFDM symbols used in the PDCCH is transmitted in the PCFICH (Indicator Channel: Physical Control Format). ACK / NACK from HARQ to PUSCH is transmitted in PHICH. í The uplink control channels have the PUSCH as a uplink data channel shared between the handset devices and the PUCCH (Physical Uplink Control Channel) which is a control channel upward link. Transmission data and further control information are transmitted on the PUSCH. Additionally, in PUCCH, downlink radio quality information (CQI: Channel Quality Indicator), ACK / NACK and the like are transmitted.
With reference to Figure 10, the entire configuration of the base station apparatus according to this modality is described. In addition, the base station apparatus 20A, 20B and 20C have the same configuration and are therefore described as the base station apparatus 20. The base station apparatus 20 is provided with a transmit / receive antenna 201, section simplification 202, transmit / receive section (transmit section) 203, baseband signal processing section 204, call processing section 205 and transmit path interface 206. The transmit data to transmit from the base station apparatus 20 for the mobile terminal apparatus 10 on the downlink are input to the baseband signal processing section 204 via the transmission path interface 206 from the upper station apparatus 30. o The section baseband signal processing 204 performs, + on the downlink data channel signal, PDCP layer processing, segmentation and concatenation of the transmission data, d-layer transmission processing and RLC (Radio Link Control) such as RLC relay control transmission processing, MAC (Media Access Control) relay control, for example, HARQ transmission processing, programming, format format selection transmission, channel coding, Fast Inverse Fourier Transform (IFFT) processing and pre-: coding processing. In addition, on a downlink control channel signal that is a downlink control channel, section 204 also performs channel encoding transmission processing, IFFT and the like.
In addition, the baseband signal processing section 204 notifies mobile terminal devices 10 connected to the same control information cell for each mobile terminal device 10 to carry out radio communications with the base station device 20 on the communication channel. diffusion. For example, broadcast information for cell communications includes bandwidth in the uplink or downlink system, identification information (Root Sequence Index) of a root sequence to generate a signal from a random access preamble. on PRACH (Physical Random Access Channel), etc.
The transmit / receive section 203 converts the frequency of the baseband signal health of the baseband signal processing section 204 into a radio frequency band. The simplification section 202 amplifies a transmission signal subject to frequency conversion to transmit to the transmit / receive antenna 201.
Meanwhile, in relation to signals transmitted from the mobile terminal device 10 to the base station device 20 on the uplink, a radio frequency signal received at the transmit / receive antenna 201 is amplified in a simplification section. 202 subject to frequency conversion in a transmit / receive section 203 and 'thereby converted to a baseband signal and is input to one. baseband signal processing section 204. baseband signal processing section 204 performs FFT processing, IDFT processing, error correction decoding, MAC relay control reception processing and layer reception processing RLC and PDCP layer in the transmission data included in the baseband signal received on the uplink.
The decoded signal is transferred to the upper station device 30 via the transmission path interface 206. The call processing section 205 performs call processing such as setting the communication channel release, managing base station handset 20 status and radio resource management.
With reference to Figure 11, the entire configuration of the mobile terminal apparatus 10 according to this embodiment is described.
The LTE terminal and the LTE-A terminal have the same configuration as the main part of the hardware, and are not distinguished to describe.
The mobile terminal device 10 is provided with a transmit / receive antenna 101, simplification section 102, transmit / receive section (receive section) 103, baseband signal processing section 104 and application section 105 With respect to data on the downlink, a radio frequency signal received at the transmit / receive antenna 101 is amplified by a simplification section 102, subject to frequency conversion into a transmit / receive section 103 and is converted to a baseband signal.
The baseband signal is subject to FFT processing, error correction decoding, retransmission control reception processing, etc. in a baseband signal processing section 104. Among the data on the downlink, the transmission data on the downlink is transferred to the application section 105. The application section 105 performs processing linked to the upper layer.
the physical layer and MAC layer and the like. In addition, among: data on the downlink, the broadcast information is also + transferred to application section 105. Meanwhile, in relation to data on uplink transmission, application section 105 inserts the data into a baseband signal processing 104 by the maximum use of two transport blocks. The baseband signal processing section 104 performs mapping processing for each channel of the transport block, relay control transmission (HARQ) processing, channel coding, DFT processing and IFFT processing. À: transmit / receive section 103 converts the frequency of the baseband signal output from the baseband signal processing section 104 into a radio frequency band. Then, the signal is amplified in a simplification section 102 and is transmitted from the transmit-are-receive antenna 101.
With reference to Figure 12, functional blocks for the base station device are described to make the mobile terminal device! measure the CQlI. Figure 12 is an explanatory view of functional blocks for the base station apparatus to make the terminal apparatus —mobilemotionCOQl. In addition, each functional block in Figure 12 is focused on the processing content of the baseband processing section. In addition, the function blocks shown in Figure 12 are simplified to describe the invention, and are assumed to have the configuration that the baseband processing section normally has.
As shown in Figure 12, the base station device 20 has a CSI-RS location section (location section) 211, CSI-RS location location index generation section 212 (index generation section) that generates CSI-RS location indexes according to the rule as shown in Figures 3A or 3B, a blank resource definition section 213, a blank resource index generation section 214 that signals blank resource indexes by signaling method as shown in Figures 7A, 7B or 7C, a generation section
tion of CSI-RS 215 parameters that generates CSI-RS parameters (transmission cycle, subframe deviation, transmission power, etc.) except * CSI-RS location indices, a broadcast signal generation section 216 and a transmit / receive section 203.
The CSI-RS 211 localization section locates CSI-RSs in broadcast resources in a resource block that corresponds to the number of CSI-RS ports according to any standard as shown in Figure 4A or 4B. The location index generation section of CSI-RS 212 generates indexes associated with the resources in which the location section of CSIRS211 finds the CSI-RSs. Therefore, section 211 retains The CSI-RS location indexes (Figure 4A (a)) of 8 CSI-RSs as basic standard indexes and which correspond to the number of CSI-RS ports, obtains' CSI location indexes -RS of CSI-RSs of the resources from the basic standard indexes by the method as shown in Figure 3A, 3B or 3C. The CSI-RS location indexes of 4 CSI-RSs or 2 CSI-RSs generated by the method as shown in Figure 3A, 3B or 3C are of a hierarchical structure such that the index pattern of the relatively low number of gateways CSI-RS is a subset of the index standard for the relatively high number of CSI-RS ports. The CSI-RS location indexes generated in the CSI-RS 212 location index generation section are inserted into the 216 broadcast signal generation section as CSI-RS parameters.
The blank resource definition section 213 defines blank resources in resources that correspond to CSI-RS resources in which CSI-RSs are located in an adjacent cell. In addition, in this mode, blank resources can be resources to which no transmission signal is assigned, or they can be defined as resources to which data is assigned to the point that it does not interfere with the CSI-RS in the cell. adjacent. Additionally, blank resources can be defined as resources that are transmitted with transmission power in the degree of non-interference with the CSI-RS in the adjacent cell. The blank resource index generation section 214 generates
blank resource index formations to enable blank resource indexes to be identified by any of the methods in Figures 7A, 7B and 7C. When the mobile terminal device 10 is notified of the blank resource index information, the resources except for CSI-RS resources are recognized as blank resources on the side of the mobile terminal device 10.
The blank resource index information generated in the blank resource index generation section 214 is input to the broadcast signal generation section 216.
The parameter generation section of CSI-RS 215 generates parameters. sequences, transmission power and the like of the CSI-RS except the position of the CSI-RS. This document describes the signaling of the * CSI-RS transmission cycle (Duty Cycle) and subframe deviation.
Since the CSI-RS is not transmitted for each subframe, the CSI-RS transmission cycle is signaled as one of the CSI-RS parameters.
Depending on the CSI-RS transmission cycle, any of 5, 10, 20, 40, 80 and 160 ms can be selected and notified. In addition, a deviation (subframe deviation) can be added to a CSI-RS transmission start position in a subframe in which the CSI-RS is transmitted. The “deviation value” is in the relationship of not exceeding the CSI-RS transmission cycle and, therefore, it is desired to combine the CSI-RS transmission cycle with the subframe deviation. Figure 14 shows the correspondence relationship between the CSI-RS transmission cycle and the subframe deviation. The CSI-RS parameter generation section 215 generates the combined CSI-RS transmission cycle and subframe deviation as shown in Figure 14 as CSI-RS parameters.
Additionally, when PDSCH silencing is applied, it is possible to amplify the transmission power of the CSI-RS by using the transmission power of elements of resources targeted for silencing.
Therefore, when the transmission power replaced so that the elements of resources targeted for silencing is signaled as a power deviation from the transmission power of the CSI-RS, it is possible to expand
: get CSI-RS transmission power.
The parameter generation section! CSI-RS 215 generates a power deviation from the trans- power. CSI-RS mission as a CSI-RS parameter.
In the meantime, unless the mobile terminal device is notified of the number (8, 4, 2) of the CSI-RS ports, the mobile terminal device is not able to perform QC measurement! through the use of CSI-RSs.
The CSI-RS 215 parameter generation section generates the number of (8, 4, 2) of the CSI-RS ports as a CSI-RS parameter.
The broadcast signal generation section 216 includes the CSI-RS location indexes, blank resource index information, and the other CSI-RS parameters for generating a broadcast signal.
In this case, the broadcast signal generation section 216 includes not only the CSI-RS parameters in the cell, but also CSI-RS parameters of the adjacent cell received through a transmit / receive section 203 to generate a signal diffusion.
The transmit / receive section 203 transmits the CS1- RSs and the broadcast signal to the mobile terminal device 10. Additionally, in the case of the application of the hybrid method to enable the indirect signaling method and the explicit signaling method for switched as described above, RRC signaling is performed for identification information to indicate whether the method is the indirect signaling method or the explicit signaling method.
With reference to Figure 13, functional blocks for the mobile terminal apparatus for measuring CQI are described.
Figure 13 is an explanatory view of functional blocks for the mobile terminal device for measuring oCQl.
In addition, each functional block in Figure 13 is focused on the processing content of the baseband processing section.
In addition, the function blocks shown in Figure 13 are simplified to describe an invention and are assumed to have a configuration that the baseband processing section normally has.
As shown in Figure 13, the mobile terminal device 10 has a transmit / receive section 103, acquisition section 111 and measurement section 112. The transmit / receive section 103 receives CSI-
Base station device's RSs and broadcast signal 20. Acquisition section 111 demodulates the broadcast signal, analyzes signal information, and from there. In this way, it acquires CSI-RS parameters such as CSI-RS location indices, blank resource indices, transmission power and the like.
Measurement section 112 measures CQIs based on the CSI-RS parameters of the server cell and the adjacent cell. The measurement section 112 measures the CQlIs of the server cell and the adjacent cell from the parameters of position information, sequence, transmission power and the like of CSI-RSs.
: Additionally, measurement section 112 measures CQIs while considering interference components of silenced resources. In this "case, measurement section 112 recognizes that resources indicated by the blank resource indices are defined as blank resources except for the CSI-RS resources in all other cells. Therefore, measurement section 112 measures the CQI taking into account blank resource interference components while recognizing that blank resources from other cells are defined in resources that correspond to CSI-RS resources from the server cell.
As described above, according to the base station apparatus 20 according to this modality, for CSI-RSs indexes located in broadcast resources, CSI-RS location indexes of the smallest number of CSI-RS ports are generated by the use of CSI-RS location indexes for the largest number of CSI-RS ports, it is therefore possible to eli- minar index the "4" and "2" CSI-RS port numbers, and is, therefore, it is possible to signal the CSI-RS location indexes with high efficiency. Additionally, by locating CSI-RS location indices in broadcast resources to signal that the CSI-RS location setting is not dependent on the cell ID design and it is possible to improve the design versatility in the system.
Additionally, in this modality as described above, in the case where CSI-RSs are located in broadcast resources, the invention adopted
There is a configuration in which the base station apparatus notifies simultaneously the plurality of mobile terminal apparatus of the + position information of CSI-RSs by the use of a broadcast signal, but the invention is not limited to one configuration. As a substitute for the configuration in which the base station handset simultaneously notifies CSI-RSs mobile terminal devices with the use of a broadcast signal, another configuration for notifying CSI-RSs mobile terminal devices individually can be adopted. According to the above, broadcast resources are not limited to a setting to simultaneously notify mobile terminal devices of CSI- - RS position information by the use of a broadcast signal and are also used to notify users. mobile terminal devices of position information from CSI-RSs to individually.
In addition, in the modality mentioned above, the mobile terminal device adopts a configuration in which the acquisition section acquires position information of blank resources from a broadcast signal, but is not limited to this configuration. The mobile terminal device can adopt another configuration in which position information of blank resources is acquired by a function block except for the acquisition section, for example, the measurement section.
The present invention is not limited to the aforementioned modality and is capable of being carried out with various modifications thereof. For example, without departing from the scope of the invention, CSI-RS assignment positions, number of processing sections, processing procedures and number of CSI-RSs in the description mentioned above are capable of being put into practice without modification to them as appropriate . Furthermore, the invention is capable of being carried out with modifications to it as appropriate without departing from the scope of the invention.
This application is based on Patent Application No. JP 2010-181867 filed on August 16, 2010, the entire content of which is expressly incorporated by reference to this document.

权利要求:
Claims (8)
[1]
1. Base station handset comprising: a location section configured to locate a Channel State Information Reference Signal (CSI-RS) in any resource elements of the CSI-RS resources defined to transmit the CSI-RS , the CSI-RS being a reference signal for downlink for which the CSI-RS location indexes are defined associated with each number of CSI-RS ports of 2.4 and 8; an index generation section configured to issue a CSI-RS Location Index corresponding to the resource elements of the CSI-RS resources where the CSI-RS is located by the location section; and a transmission section configured to transmit the CSI-RS location indexes issued from the Index generation section to a mobile terminal device, where the CSI-RS location indexes are defined associated with the number of CSI-RS ports in a way that an index pattern of a relatively low number of CSI-RS ports is a subset of an index pattern of a relatively high number of CSI-RS ports, and an index pattern comprised of two CSI-RS location indexes “n” and “n + N” associated with the number of CSI-RS ports of “4” is derived from a basic index “n” associated with the number of CSI-RS ports “8”, and an index pattern comprised of four CSI-RS location indices including the two CSI-RS location indices “n” and “n + N” associated with the number of CSI-RS ports of “2 "is derived from the CSI-RS location indices" nº and "n + N".
[2]
2. Base station apparatus according to claim 1, in which the four CSI-RS location indexes of the index pattern associated with the number of CSI-RS ports of “2” derived from the indexes of CSI-RS location “ne“ n + N ”are CSI-RS location indexes of“ nº, “n + N”, “n + 2N” and “043N”,
[3]
Base station apparatus according to claim 1 or 2, wherein the transmission section simultaneously transmits position information from the CSI-RS to a plurality of mobile terminal apparatus using a broadcast signal.
[4]
4, Base station apparatus, according to claim 1 or 2, further comprising: a blank resource definition section that defines resources in which the CSI-RS is located in an adjacent area on blank resources, where the transmission section transmits position information from the blank resources to the mobile terminal device.
[5]
5. Base station apparatus according to claim 4, in which the transmission section transmits, to the mobile terminal apparatus, bitmap information indicating the positions of the blank resources in a bitmap form associated with the resources for CSI-RS .
[6]
6. Base station apparatus according to claim 4, in which the transmission section generates position information indicative of a start position and an end position of the blank resources that use CSI-RS location indexes generated in the Index generation section and transmit the position information to the mobile terminal device.
[7]
7. Base station apparatus according to claim 4, in which the transmission section transmits the contiguous number of the contiguous blank resources in the CSI-RS resources to the mobile terminal apparatus with the position information of the resources in White.
[8]
8. Method of signaling a Reference Channel Information Information Signal (CSI-RS) comprising the steps of: on a base station device: locate a CSI-RS in any resource elements of the CSI- resources RS defined to transmit the CSI-RS, the CSI-RS being a reference signal for downlink for which the CSI-RS location indexes are defined associated with each number of CSI-RS ports of 2.4 and 8; issue a CSI-RS location index corresponding to the resource elements of the CSI-RS resources where the CSI-RS is located by the location section; and transmit the CSI-RS location indexes issued from the Index generation section to a mobile terminal device, in which the CSI-RS location indexes are defined associated with the number of CSI-RS ports of a so that an index pattern of a relatively low number of CSI-RS ports is a subset of an index pattern of a relatively high number of CSI-RS ports, and an index pattern comprised of two CSI- RS “n” and “n + N” associated with the number of CSI-RS ports of “4” is derived from a basic index “number associated with the number of CSI-RS ports of“ 8 ”, and a pattern of index comprised of four CSI-RS location indices including the two CSI-RS location indices “no and“ n + N ”associated with the number of CSI-RS ports of“ 2 ”is derived from the indices of CSI-RS location “nº and“ n + N ”.

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法律状态:
2020-08-18| B08F| Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]|Free format text: ARQUIVADO O PEDIDO DE PATENTE, NOS TERMOS DO ARTIGO 86, DA LPI, E ARTIGO 10 DA RESOLUCAO 113/2013, REFERENTE AO NAO RECOLHIMENTO DA 9A RETRIBUICAO ANUAL, PARA FINS DE RESTAURACAO CONFORME ARTIGO 87 DA LPI 9.279, SOB PENA DA MANUTENCAO DO ARQUIVAMENTO CASO NAO SEJA RESTAURADO DENTRO DO PRAZO LEGAL, CONFORME O DISPOSTO NO ARTIGO 12 DA RESOLUCAO 113/2013. |

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2020-12-08| B08K| Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]|Free format text: EM VIRTUDE DO ARQUIVAMENTO PUBLICADO NA RPI 2589 DE 18-08-2020 E CONSIDERANDO AUSENCIA DE MANIFESTACAO DENTRO DOS PRAZOS LEGAIS, INFORMO QUE CABE SER MANTIDO O ARQUIVAMENTO DO PEDIDO DE PATENTE, CONFORME O DISPOSTO NO ARTIGO 12, DA RESOLUCAO 113/2013. |

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

优先权:

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申请号 | 申请日 | 专利标题

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JP2010181867A|JP5345111B2|2010-08-16|2010-08-16|CSI-RS signaling method and base station apparatus|

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JP2010-181867|2010-08-16|

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PCT/JP2011/068546|WO2012023550A1|2010-08-16|2011-08-16|Csi-rs signaling method and base station|

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