# US 9,439,080 B2 · Feedback design of hierarchical coordinated multipoint transmission > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,439,080 B2 - Document ID: US9439080B2 - Status: Granted - Kind: B2 - Application number: 14/124,273 - Filed: 2011-06-08 - Published: 2014-04-24 - Granted: 2016-09-06 - Earliest claimed: 2011-06-08 - Assignees: Broadcom Corporation - Applicants: Shuang Tan; Tommi Koivisto; Helka-Liina Maattanen - Inventors: Shuang Tan; Tommi Koivisto; Helka-Liina Maattanen - Web page: https://patentgrep.com/patent/US9439080B2 ## CPC - H04W 16/18: Network planning tools - 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 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 48/20: Selecting an access point - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract The present invention provides a method, apparatus and a computer program product for feedback design of hierarchical coordinated multipoint transmission. The present invention includes obtaining, at a user equipment, a list including a predetermined number of cells, identifying, at the user equipment, a cooperation set of cells including the cell serving the user equipment, determining, at the user equipment, for each cell included in the list whether the cell belongs to the identified cooperation set of the user equipment, and if the cell belongs to the cooperation set of the user equipment, reporting a first predetermined set of parameters, and if the cell does not belong to the cooperation set of the user equipment, reporting a second predetermined set of parameters. ## Claims ### Claim 1 A method, comprising: obtaining, at a user equipment, a list including a predetermined number of cells; identifying, at the user equipment, a cooperation set of cells including a cell serving the user equipment; determining, at the user equipment whether each cell included in the list belongs to the identified cooperation set of the user equipment; and for cells belonging to the cooperation set of the user equipment, reporting a first predetermined set of parameters, and for cells not belonging to the cooperation set of the user equipment, reporting a second predetermined set of parameters, wherein the second predetermined set of parameters are coarser than the first set of predetermined parameters. ### Claim 2 (depends on 1) The method according to claim 1, wherein for cells that belong to the cooperation set of the user equipment but are not included in the list, no parameters are reported. ### Claim 3 (depends on 1) The method according to claim 1, wherein the first set of parameters includes Channel Quality Indicator, CQI, per-cell Precoding Matrix indicator, PMI, and inter-cell combiners according to Joint Processing Cooperation Multipoint Transmission, JP CoMP. ### Claim 4 (depends on 1) The method according to claim 1, wherein the second set of parameters includes best companion Precoding Matrix Indicator, PMI, according to inter-set Coordinated Beamforming/Coordinated Scheduling, CB/CS, CoMP. ### Claim 5 (depends on 1) The method according to claim 1, wherein the second set of parameters includes worst companion Precoding Matrix Indicator, PMI, according to inter-set Coordinated Beamforming/Coordinated Scheduling, CB/CS, CoMP. ### Claim 6 (depends on 1) The method according to claim 1, wherein obtaining the list comprises composing the list at the user equipment, the method further comprising: measuring, at the user equipment, a received power from a base station of a specific cell, and composing, at the user equipment, the list including the predetermined number of cells based on the received power of the cells. ### Claim 7 (depends on 1) The method according to claim 1, wherein obtaining the list comprises receiving the list at the user equipment. ### Claim 8 (depends on 7) The method according to claim 7, wherein further comprising: measuring, at the user equipment, a received power from a base station of a specific cell, reporting the measured received power of the specific cell, and receiving, from the base station, the list including the predetermined number of cells based on the measured received power of the specific cell. ### Claim 9 (depends on 1) The method according to claim 1, wherein the predetermined number is a threshold controlled number. ### Claim 10 An apparatus, comprising: circuitry configured to obtain a list including a predetermined number of cells; identify a cooperation set of cells including a cell serving the user equipment; determine whether each cell included in the list belongs to the identified cooperation set of the user equipment; and report, for cells belonging to the cooperation set of the user equipment, a first predetermined set of parameters, and report, for cells not belonging to the cooperation set of the user equipment, a second predetermined set of parameters, wherein the second predetermined set of parameters are coarser than the first set of predetermined parameters. ### Claim 11 (depends on 10) The apparatus according to claim 10, wherein for cells that belong to the cooperation set of the user equipment but are not included in the list, the circuitry is further configured to report no parameters. ### Claim 12 (depends on 10) The apparatus according to claim 10, wherein the first set of parameters includes Channel Quality Indicator, CQI, per-cell Precoding Matrix indicator, PMI, and inter-cell combiners according to Joint Processing Cooperation Multipoint Transmission, JP CoMP. ### Claim 13 (depends on 10) The apparatus according to claim 10, wherein the second set of parameters includes best companion Precoding Matrix Indicator, PMI, according to inter-set Coordinated Beamforming/Coordinated Scheduling, CB/CS, CoMP. ### Claim 14 (depends on 10) The apparatus according to claim 10, wherein the second set of parameters includes worst companion Precoding Matrix Indicator, PMI, according to inter-set Coordinated Beamforming/Coordinated Scheduling, CB/CS, CoMP. ### Claim 15 (depends on 10) The apparatus according to claim 10, wherein the circuitry is further configured to compose the list including the predetermined number of cells. ### Claim 16 (depends on 15) The apparatus according to claim 15, wherein the circuitry is further configured to measure a received power from a base station of a specific cell, and compose the list including the predetermined number of cells based on the received power of the specific cell. ### Claim 17 (depends on 10) The apparatus according to claim 10, wherein the circuitry is further configured to receive the list including the predetermined number of cells. ### Claim 18 (depends on 17) The apparatus according to claim 17, wherein the circuitry is further configured to: measure a received power from a base station of a specific cell, and report the measured received power of the specific cell, wherein the circuitry is further configured to receive, from the base station, the list including the predetermined number of cells based on the measured received power of the specific cell. ### Claim 19 (depends on 10) The apparatus according to claim 10, wherein the predetermined number is a threshold controlled number. ### Claim 20 A non-transitory computer-readable medium encoded with computer-readable instructions, that when executed by circuitry, causes the circuitry to perform a method comprising: obtaining, at the user equipment, a list including a predetermined number of cells; identifying, at the user equipment, a cooperation set of cells including a cell serving the user equipment; determining, at the user equipment whether each cell included in the list belongs to the identified cooperation set of the user equipment; and for cells belonging to the cooperation set of the user equipment, reporting a first predetermined set of parameters, and for cells not belonging to the cooperation set of the user equipment, reporting a second predetermined set of parameters, wherein the second predetermined set of parameters are coarser than the first set of predetermined parameters.