# US 9,520,932 B2 · Method and apparatus for transmitting and receiving feedback information for inter-cell cooperative transmission in wireless communication cellular system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,932 B2 - Document ID: US9520932B2 - Status: Granted - Kind: B2 - Application number: 14/161,289 - Filed: 2014-01-22 - Published: 2014-05-15 - Granted: 2016-12-13 - Earliest claimed: 2009-06-04 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: In Ho Lee; Jin Kyu Han; Joon Young Cho; Cheng Shan; Sung Tae Kim - Web page: https://patentgrep.com/patent/US9520932B2 ## CPC - H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection} - H04B 7/024: Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems - H04B 7/0434: {using multiple eigenmodes} - H04B 7/0478: {Special codebook structures directed to feedback optimisation} - H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04B 7/0634: {Antenna weights or vector/matrix coefficients} - H04L 5/0073: {Allocation arrangements that take into account other cell interferences} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04B 7/0617: {for beam forming} - H04B 7/0619: {using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001)} - H04L 5/0057: {Physical resource allocation for CQI} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method for transmitting feedback information for collaborative transmission in a cellular radio communication system is provided. The method includes receiving, from the base station, collaborative cell information indicating a plurality of collaborative cells, determining at least two preferred collaborative cells among the plurality of collaborative cells, generating feedback information including cell indicators for discriminating between the at least two preferred collaborative cells and the other cell, precoding matrix indicators for the at least two preferred collaborative cells, and channel quality indicators, and transmitting the feedback information via one of a control channel and a data channel. ## Claims ### Claim 1 A method for transmitting feedback information for collaborative transmission in a cellular radio communication system, the method comprising: receiving, from a base station, collaborative cell information indicating at least three collaborative cells; determining at least two preferred collaborative cells among the at least three collaborative cells; generating feedback information including cell indicators for discriminating between the at least two preferred collaborative cells and at least one non-preferred collaborative cell, precoding matrix indicators for the at least two preferred collaborative cells, and channel quality indicators; and transmitting the feedback information via one of a control channel and a data channel, wherein the feedback information is transmitted in a transmission format having a fixed size regardless of a number of collaborative cells. ### Claim 2 (depends on 1) The method of claim 1, wherein the precoding matrix indicators indicate precoding vectors corresponding to the at least two preferred collaborative cells. ### Claim 3 (depends on 1) The method of claim 1, wherein the precoding matrix indicators indicate a precoding vector, minimizing inter-cell interference in the collaborative transmission, that is recommended to be used for the at least two preferred collaborative cells. ### Claim 4 (depends on 1) The method of claim 1, wherein the precoding matrix indicators indicate a precoding vector mapped to the at least two preferred collaborative cells in a multi-cell codebook that is a single codebook generated for the at least three collaborative cells. ### Claim 5 (depends on 4) The method of claim 4, wherein the multi-cell codebook includes compensation values determined based on phases of the at least three collaborative cells. ### Claim 6 A method for receiving feedback information for collaborative transmission in a cellular radio communication system, the method comprising: receiving feedback information including cell indicators for discriminating between at least two preferred collaborative cells and at least one non-preferred collaborative cell, precoding matrix indicators for the at least two preferred collaborative cells, and channel quality indicators, via one of a control channel and a data channel; and scheduling the collaborative transmission based on the feedback information, wherein the feedback information is transmitted in a transmission format having a fixed size regardless of a number of collaborative cells. ### Claim 7 (depends on 6) The method of claim 6, wherein the precoding matrix indicators indicate precoding vectors corresponding to the at least two preferred collaborative cells. ### Claim 8 (depends on 6) The method of claim 6, wherein the precoding matrix indicators indicate a precoding vector, minimizing inter-cell interference in the collaborative transmission, that is recommended to be used for the at least two preferred collaborative cells. ### Claim 9 (depends on 6) The method of claim 6, wherein the precoding matrix indicators indicate a precoding vector mapped to the at least two preferred collaborative cells in a multi-cell codebook that is a single codebook generated for at least three collaborative cells. ### Claim 10 (depends on 9) The method of claim 9, wherein the multi-cell codebook includes compensation values determined based on phases of the at least three collaborative cells. ### Claim 11 An apparatus for transmitting feedback information for collaborative transmission in a cellular radio communication system, the apparatus comprising: a receiver configured to receive a first Radio Frequency (RF) signal; a transmitter configured to transmit a second RF signal; and a controller configured to: control the receiver to receive, from a base station, the first RF signal including collaborative cell information indicating at least three collaborative cells, determine at least two preferred collaborative cells among the at least three collaborative cells, generate feedback information including cell indicators for discriminating between the at least two preferred collaborative cells and at least one non-preferred collaborative cell, precoding matrix indicators for the at least two preferred collaborative cells, and channel quality indicators, and control the transceiver to transmit the second RF signal including the feedback information via one of a control channel and a data channel, wherein the feedback information is transmitted in a transmission format having a fixed size regardless of a number of collaborative cells. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the precoding matrix indicators indicate precoding vectors corresponding to the at least two preferred collaborative cells. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein the precoding matrix indicators indicate a precoding vector, minimizing inter-cell interference in the collaborative transmission, that is recommended to be used for the at least two preferred collaborative cells. ### Claim 14 (depends on 11) The apparatus of claim 11, wherein the precoding matrix indicators indicate a precoding vector mapped to the at least two preferred collaborative cells in a multi-cell codebook that is a single codebook generated for the at least three collaborative cells. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the multi-cell codebook includes compensation values determined based on phases of the at least three collaborative cells. ### Claim 16 An apparatus for receiving feedback information for collaborative transmission in a cellular radio communication system, the apparatus comprising: a receiver configured to receive a Radio Frequency (RF) signal; and a controller configured to: control the receiver to receive the RF signal including feedback information including cell indicators for discriminating between at least two preferred collaborative cells and at least one non-preferred collaborative cell, precoding matrix indicators for the at least two preferred collaborative cells, and channel quality indicators, via one of a control channel and a data channel, and schedule the collaborative transmission based on the feedback information, wherein the feedback information is transmitted in a transmission format having a fixed size regardless of a number of collaborative cells. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the precoding matrix indicators indicate precoding vectors corresponding to the at least two preferred collaborative cells. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the precoding matrix indicators indicate a precoding vector, minimizing inter-cell interference in the collaborative transmission, that is recommended to be used for the at least two preferred collaborative cells. ### Claim 19 (depends on 17) The apparatus of claim 17, wherein the precoding matrix indicators indicate a precoding vector mapped to the at least two preferred collaborative cells in a multi-cell codebook that is a single codebook generated for at least three collaborative cells. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein the multi-cell codebook includes compensation values determined based on phases of the at least three collaborative cells.