# US 10,312,975 B2 · Apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,312,975 B2 - Document ID: US10312975B2 - Status: Granted - Kind: B2 - Application number: 15/542,482 - Filed: 2016-02-10 - Published: 2018-09-27 - Granted: 2019-06-04 - Earliest claimed: 2015-03-24 - Assignees: Sony Corporation - Applicants: Sony Corporation - Inventors: Hiroaki Takano - Web page: https://patentgrep.com/patent/US10312975B2 ## CPC - H04B 7/0413: MIMO systems - H04B 7/0634: {Antenna weights or vector/matrix coefficients} - H04B 7/0473: {taking constraints in layer or codeword to antenna mapping into account} - H04B 7/0617: {for beam forming} - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - 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} - H04B 7/0658: {Feedback reduction} - H04B 7/0691: {using subgroups of transmit antennas} - H04L 5/0023: {Time-frequency-space} - H04L 5/0057: {Physical resource allocation for CQI} - H04L 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04W 16/28: using beam steering - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 72/563: of the wireless resources - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - 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 [Object] To make it possible to use a combination of subarrays desirable for multilayer MIMO. [Solution] Provided is an apparatus, including: an acquiring unit configured to acquire subarray information indicating a plurality of subarrays usable for multilayer Multi-Input Multi-Output (MIMO); and a control unit configured to notify a terminal apparatus of the subarray information. ## Claims ### Claim 1 An apparatus, comprising: a processor configured to: acquire subarray information indicating a plurality of subarrays usable for multilayer Multi-Input Multi-Output (MIMO); notify a terminal apparatus of the subarray information, wherein the terminal apparatus is a terminal apparatus that performs a report related to a combination of two or more subarrays included in the plurality of subarrays; and decide a combination of two or more subarrays to be used for the multilayer MIMO for the terminal apparatus on the basis of the report performed by the terminal apparatus, wherein the combination of the two or more subarrays to be used for the multilayer MIMO for the terminal apparatus does not include more than a predetermined number of subarrays that share one or more antenna ports. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the subarray information includes information indicating an antenna port included in each of the plurality of subarrays. ### Claim 3 (depends on 1) The apparatus according to claim 1, wherein the subarray information includes identification information identifying each of the plurality of subarrays. ### Claim 4 (depends on 1) The apparatus according to claim 1, wherein the processor is further configured to: acquire first number information indicating the number of subarrays to be combined for the multilayer MIMO, and notify the terminal apparatus of the first number information. ### Claim 5 (depends on 1) The apparatus according to claim 1, wherein the processor is further configured to: acquire second number information indicating the number of combinations of subarrays to be reported, and notify the terminal apparatus of the second number information. ### Claim 6 (depends on 1) The apparatus according to claim 1, wherein the plurality of subarrays includes two or more subarrays that share one or more antenna ports. ### Claim 7 (depends on 1) The apparatus according to claim 1, wherein the processor is further configured to: acquire combination candidate information indicating one or more combination candidates of two or more subarrays included in the plurality of subarrays, and notify the terminal apparatus of the combination candidate information. ### Claim 8 (depends on 7) The apparatus according to claim 7, wherein the combination candidate information indicates two or more combination candidates of two or more subarrays included in the plurality of subarrays, and wherein the processor is further configured to: acquire priority information indicating priorities of the two or more combination candidates, and notify the terminal apparatus of the priority information. ### Claim 9 (depends on 1) The apparatus according to claim 1, wherein the processor is further configured to: acquire group information indicating a group of two or more subarrays forming a directional beam in the same radiation direction in the multilayer MIMO among the plurality of subarrays, and notify the terminal apparatus of the group information. ### Claim 10 An apparatus, comprising: a processor configured to: acquire subarray information indicating a plurality of subarrays usable for multilayer MIMO; acquire combination candidate information indicating two or more combination candidates of two or more subarrays included in the plurality of subarrays; perform a report related to a combination of two or more subarrays included in the plurality of subarrays, wherein the report is related to a combination included in the two or more combination candidates; acquire priority information indicating priorities of the two or more combination candidates; and perform a report related to a combination included in the two or more combination candidates on the basis of the priority information. ### Claim 11 (depends on 10) The apparatus according to claim 10, wherein the processor is further configured to: select a combination of two or more subarrays desirable for the multilayer MIMO from among the plurality of subarrays, and the report includes a report of the combination of the two or more subarrays desirable for the multilayer MIMO. ### Claim 12 (depends on 10) The apparatus according to claim 10, wherein the report includes a report of a weight set for the combination of the two or more subarrays. ### Claim 13 (depends on 12) The apparatus according to claim 12, wherein the weight set includes a weight set for adjusting a phase between the two or more subarrays. ### Claim 14 (depends on 10) The apparatus according to claim 10, wherein the report includes a report of the number of layers for the combination of the two or more subarrays. ### Claim 15 (depends on 10) The apparatus according to claim 10, wherein the report includes a report of a channel quality for the combination of the two or more subarrays. ### Claim 16 (depends on 10) The apparatus according to claim 10, wherein the processor is further configured to: acquire group information indicating a group of two or more subarrays forming a directional beam in the same radiation direction in the multilayer MIMO among the plurality of subarrays, and decide a weight set for obtaining directivity for the group on the basis of the group information.