# US 9,882,616 B2 · Method and apparatus for transmitting and receiving feedback information in mobile communication system based on 2 dimensional massive MIMO > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,882,616 B2 - Document ID: US9882616B2 - Status: Granted - Kind: B2 - Application number: 14/454,560 - Filed: 2014-08-07 - Published: 2015-02-12 - Granted: 2018-01-30 - Earliest claimed: 2013-08-07 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Hyo Jin Lee; Youn Sun Kim; Ju Ho Lee; Young Bum Kim; Hyoung Ju Ji - Web page: https://patentgrep.com/patent/US9882616B2 ## CPC - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - H04B 7/0417: Feedback systems - H04B 7/0452: Multi-user MIMO systems - H04B 7/0469: {taking special antenna structures, e.g. cross polarized antennas into account} - H04B 7/0479: {for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]} - H04B 7/0617: {for beam forming} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection} - H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection} - H04L 5/0023: {Time-frequency-space} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0057: {Physical resource allocation for CQI} - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A feedback information transmission/reception method for use in a mobile communication system is provided. The feedback information transmission method includes receiving configuration information on at least two reference signals and feedback configuration information for use in generating feedback information based on the at least two reference signals from a base station, receiving the at least two reference signals from the base station, measuring the at least two reference signals received, generating the feedback information based on the measurement result according to the feedback configuration information, and transmitting the feedback information to the base station. ## Claims ### Claim 1 A method for feedback information transmission by a terminal in a mobile communication system, the method comprising: receiving reference signal (RS) configuration information on at least two reference signals and feedback configuration information for generating feedback information based on the at least two reference signals from a base station, the feedback configuration information including precoding matrix indicator (PMI) codebook information and at least one of a number of reference signals for generating the feedback information, channel information corresponding to respective reference signals, feedback time information, or interference measurement resource information; receiving the at least two reference signals from the base station; measuring the received at least two reference signals; generating the feedback information based on the measuring according to the feedback configuration information; and transmitting the feedback information to the base station, wherein the at least two reference signals respectively correspond to first and second direction antenna groups respectively of a plurality of antennas arranged 2-dimentionally at the base station. ### Claim 2 (depends on 1) The method of claim 1, wherein the feedback information comprises a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), and a Channel Quality Indicator (CQI), the PMI being generated by referencing a codebook defined based on the first and second direction antenna groups. ### Claim 3 (depends on 2) The method of claim 2, wherein the codebook is defined based on a first index indicating a beamforming vector selectable among beamforming vectors for the first direction antenna group, a second index indicating a beamforming vector selectable among beamforming vectors for the second direction antenna group, and a third index indicating a beamforming vector to be used actually. ### Claim 4 (depends on 3) The method of claim 3, wherein the feedback information comprises the first to third indices selected based on the PMI to the base station. ### Claim 5 (depends on 2) The method of claim 2, wherein the CQI is determined depending on the PMI generated based on the codebook. ### Claim 6 (depends on 1) The method of claim 1, wherein the feedback information comprises rank indicators generated in correspondence to the at least two reference signals respectively, precoding matrix indicators generated in correspondence to the at least two reference signals respectively, and channel quality indicators generated in correspondence to the precoding matrix indicators respectively. ### Claim 7 (depends on 1) The method of claim 1, wherein the RS configuration information comprises at least one of numbers of ports of corresponding reference signals, and transmission times, resources, sequences, and transmit powers of the at least two reference signals. ### Claim 8 A method for feedback information reception by a base station in a mobile communication system, the method comprising: transmitting reference signal (RS) configuration information on at least two reference signals and feedback configuration information for generating feedback information based on the at least two reference signals to a terminal, the feedback configuration information including precoding matrix indicator (PMI) codebook information and at least one of a number of reference signals for generating the feedback information, channel information corresponding to respective reference signals, feedback time information, or interference measurement resource information; transmitting the at least two reference signals to the terminal; and receiving the feedback information generated based on the feedback configuration information from the terminal, wherein the at least two reference signals respectively correspond to first and second direction antenna groups of a plurality of antennas arranged 2-dimentionally at the base station. ### Claim 9 (depends on 8) The method of claim 8, wherein the feedback information comprises a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), and a Channel Quality Indicator (CQI), the PMI being generated by referencing a codebook defined based on first and second direction antenna groups. ### Claim 10 (depends on 9) The method of claim 9, wherein the codebook is defined based on a first index indicating a beamforming vector selectable among beamforming vectors for the first direction antenna group, a second index indicating a beamforming vector selectable among beamforming vectors for the second direction antenna group, and a third index indicating a beamforming vector to be used actually. ### Claim 11 (depends on 10) The method of claim 10, wherein the feedback information comprises the first to third indices selected based on the PMI. ### Claim 12 (depends on 9) The method of claim 9, wherein the CQI is determined depending on the PMI generated based on the codebook. ### Claim 13 (depends on 8) The method of claim 8, wherein the feedback information comprises rank indicators generated in correspondence to the at least two reference signals respectively, precoding matrix indicators generated in correspondence to the at least two reference signals respectively, and channel quality indicators generated in correspondence to the precoding matrix indicators respectively. ### Claim 14 (depends on 8) The method of claim 8, wherein the RS configuration information comprises at least one of numbers of ports of corresponding reference signals, and transmission times, resources, sequences, and transmit powers of the at least two reference signals. ### Claim 15 A terminal for transmitting feedback information in a mobile communication system, the terminal comprising: one or more antennas; and a controller configured to: control to receive, via one or more of the antennas, reference signal (RS) configuration information on at least two reference signals and feedback configuration information for generating feedback information based on the at least two reference signals from a base station and, afterward, to receive, via one or more of the antennas, the at least two reference signals from the base station, the feedback configuration information including precoding matrix indicator (PMI) codebook information and at least one of a number of reference signals for generating the feedback information, channel information corresponding to respective reference signals, feedback time information, or interference measurement resource information, measure the received at least two reference signals, generate the feedback information based on the measuring according to the feedback configuration information, and control to transmit, via one or more of the antennas, the feedback information to the base station, wherein the at least two reference signals respectively correspond to first and second direction antenna groups of a plurality of antennas arranged 2-dimentionally at the base station. ### Claim 16 (depends on 15) The terminal of claim 15, wherein the feedback information comprises a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), and a Channel Quality Indicator (CQI); and the controller is configured to generate the PMI by referencing a codebook defined based on a first index indicating a beamforming vector selectable among beamforming vectors for the first direction antenna group, a second index indicating a beamforming vector selectable among beamforming vectors for the second direction antenna group, and a third index indicating a beamforming vector to be used actually. ### Claim 17 (depends on 16) The terminal of claim 16, wherein the controller is configured to control to transmit the feedback information including the first to third indices selected based on the PMI. ### Claim 18 (depends on 16) The terminal of claim 16, wherein the controller is configured to generate the CQI based on the PMI generated based on the codebook. ### Claim 19 (depends on 15) The terminal of claim 15, wherein the feedback information comprises rank indicators generated in correspondence to the at least two reference signals respectively, precoding matrix indicators generated in correspondence to the at least two reference signals respectively, and channel quality indicators generated in correspondence to the precoding matrix indicators respectively. ### Claim 20 A base station for receiving feedback information in a mobile communication system, the base station comprising: a plurality of antennas; and a controller configured to control to transmit, via one or more of the antennas, reference signal (RS) configuration information on at least two reference signals and feedback configuration information for generating feedback information based on the at least two reference signals to a terminal and, afterward, to transmit, via one or more of the antennas, the at least two reference signals to the terminal, the feedback configuration information including precoding matrix indicator (PMI) codebook information and at least one of a number of reference signals for generating the feedback information, channel information corresponding to respective reference signals, feedback time information, or interference measurement resource information; and to receive, via one or more of the antennas, the feedback information generated based on the feedback configuration information from the terminal, wherein the at least two reference signal respectively correspond to first and second direction antenna groups of a plurality of antennas arranged 2-dimensionally at the base station. ### Claim 21 (depends on 20) The base station of claim 20, wherein the feedback information comprises a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), and a Channel Quality Indicator (CQI), the PMI being generated by referencing a codebook defined based on a first index indicating a beamforming vector selectable among beamforming vectors for the first direction antenna group, a second index indicating a beamforming vector selectable among beamforming vectors for the second direction antenna group, and a third index indicating a beamforming vector to be used actually. ### Claim 22 (depends on 21) The base station of claim 21, wherein the feedback information comprises the first to third indices selected based on the PMI. ### Claim 23 (depends on 21) The base station of claim 21, wherein the CQI is determined depending on the PMI generated based on the codebook. ### Claim 24 (depends on 20) The base station of claim 20, wherein the feedback information comprises rank indicators generated in correspondence to the at least two reference signals respectively, precoding matrix indicators generated in correspondence to the at least two reference signals respectively, and channel quality indicators generated in correspondence to the precoding matrix indicators respectively.