# US 10,455,606 B2 · Spatial flow determining method, base station, and user equipment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,455,606 B2 - Document ID: US10455606B2 - Status: Granted - Kind: B2 - Application number: 15/295,653 - Filed: 2016-10-17 - Published: 2017-02-02 - Granted: 2019-10-22 - Earliest claimed: 2014-04-18 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Xiaoyan Bi; Dageng Chen; Hejia Luo - Web page: https://patentgrep.com/patent/US10455606B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04B 7/0417: Feedback systems - H04B 7/0486: {taking channel rank into account} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 40/02: Communication route or path selection, e.g. power-based or shortest path routing - H04W 72/02: Selection of wireless resources by user or terminal - H04B 7/0697: {using spatial multiplexing} - 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 Embodiments provide a spatial flow determining method, a base station, and user equipment. The method includes sending, by a base station, a feedback mode indication to user equipment, where the feedback mode indication is used to instruct the user equipment to feed back, based on a packet granularity, channel state report (CSR) information, and each packet granularity includes at least one spatial flow. The method also includes receiving, by the base station, CSR information of each packet granularity that is sent by the user equipment; and determining, by the base station according to the CSR information of each packet granularity, a spatial flow used to transmit data to the user equipment. ## Claims ### Claim 1 A method, comprising: sending, by a base station, a feedback mode indication to user equipment, wherein the feedback mode indication instructs the user equipment to feed back channel state report (CSR) information using a first group granularity of one or more group granularities, wherein each group granularity of the one or more group granularities comprises at least one spatial flow, a quantity of spatial flows comprised in each group granularity of the one or more group granularities is less than a quantity of spatial flows comprised in each code word used for transmission between the user equipment and the base station; receiving, by the base station, the CSR information that is sent by the user equipment using the first group granularity, wherein the CSR information comprises a plurality of sets of CSR information, each set of the plurality of sets of CSR information has the first group granularity, and the CSR information that is sent using the first group granularity comprises channel quality information of each spatial flow comprised in the CSR information; determining, by the base station for each set of the plurality of sets of CSR information, information about an average value of channel quality of spatial flows in the respective set, and information about a difference between the channel quality of each spatial flow in the respective set and the average value according to the channel quality information of each spatial flow in the respective set; and determining, by the base station according to the CSR information, a first spatial flow for transmitting data to the user equipment. ### Claim 2 (depends on 1) The method according to claim 1, wherein before receiving the CSR information that is sent by the user equipment using the first group granularity, the method further comprises: sending, by the base station, configuration information to the user equipment, wherein the configuration information comprises: a quantity of spatial flows comprised in each group granularity of the one or more group granularities. ### Claim 3 (depends on 1) The method according to claim 1, wherein before receiving the CSR information that is sent by the user equipment using the first group granularity, the method further comprises: sending, by the base station, configuration information to the user equipment, wherein the configuration information comprises a time-frequency resource occupied by the CSR information. ### Claim 4 (depends on 1) The method according to claim 1, wherein before receiving the CSR information that is sent by the user equipment using the first group granularity, the method further comprises: sending, by the base station, configuration information to the user equipment, wherein the configuration information comprises feedback manner information of different group granularities of the one or more group granularities. ### Claim 5 A method, comprising: receiving, by user equipment, a feedback mode indication sent by a base station, wherein the feedback mode indication instructs the user equipment to feed back channel state report (CSR) information using a first group granularity of one or more group granularities, wherein each group granularity of the one or more group granularities comprises at least one spatial flow, and a quantity of spatial flows comprised in each group granularity of the one or more group granularities is less than a quantity of spatial flows comprised in each code word used for transmission between the user equipment and the base station; measuring, by the user equipment, channel quality information of each spatial flow used to transmit data between the user equipment and the base station, and obtaining the CSR information according to the channel quality information, wherein the CSR information comprises a plurality of sets of CSR information, each set of the plurality of sets of CSR information has the first group granularity, and wherein the CSR information that is sent using the first group granularity comprises the channel quality information of each spatial flow used to transmit data between the user equipment and the base station; and sending, by the user equipment, the CSR information to the base station according to the feedback mode indication, wherein sending the CSR information to the base station causes the base station to determine, for each set of the plurality of sets of CSR information, information about an average value of channel quality of spatial flows in the respective set, and information about a difference between the channel quality of each spatial flow in the respective set and the average value according to the channel quality information of each spatial flow in the respective set. ### Claim 6 (depends on 5) The method according to claim 5, wherein before measuring the channel quality information of each spatial flow used to transmit data between the user equipment and the base station, the method further comprises: receiving, by the user equipment, configuration information sent by the base station, wherein the configuration information comprises: a quantity of spatial flows comprised in each group granularity of the one or more group granularities. ### Claim 7 (depends on 5) The method according to claim 5, wherein before measuring the channel quality information of each spatial flow used to transmit data between the user equipment and the base station, the method further comprises: receiving, by the user equipment, configuration information sent by the base station, wherein the configuration information comprises: a time-frequency resource occupied by the CSR information. ### Claim 8 (depends on 5) The method according to claim 5, wherein before measuring the channel quality information of each spatial flow used to transmit data between the user equipment and the base station, the method further comprises: receiving, by the user equipment, configuration information sent by the base station, wherein the configuration information comprises feedback manner information of different group granularities of the one or more group granularities. ### Claim 9 A base station, comprising: a transmitter, configured to send a feedback mode indication to user equipment, wherein the feedback mode indication instructs the user equipment to feed back channel state report (CSR) information using a first group granularity of one or more group granularities, wherein each group granularity comprises at least one spatial flow, a quantity of spatial flows comprised in each group granularity of the one or more group granularities is less than a quantity of spatial flows comprised in each code word used for transmission between the user equipment and the base station, and wherein the CSR information that is sent using the first group granularity comprises channel quality information of each spatial flow comprised in the CSR information; a receiver, configured to receive the CSR information that is sent by the user equipment using the first group granularity, wherein the CSR information comprises a plurality of sets of CSR information, and each set of the plurality of sets of CSR information has the first group granularity; and a processor, configured to: determine, for each set of the plurality of sets of CSR information, information about an average value of channel quality of spatial flows in the respective set, and information about a difference between the channel quality of each spatial flow in the respective set and the average value according to the channel quality information of each spatial flow in the respective set; and determine, according to the CSR information, a first spatial flow for transmitting data to the user equipment. ### Claim 10 (depends on 9) The base station according to claim 9, wherein the transmitter is further configured to: before the receiver receives the CSR information that is sent by the user equipment, send configuration information to the user equipment, wherein the configuration information comprises: a quantity of spatial flows comprised in each group granularity of the one or more group granularities. ### Claim 11 (depends on 9) The base station according to claim 9, wherein the transmitter is further configured to: before the receiver receives the CSR information that is sent by the user equipment, send configuration information to the user equipment, wherein the configuration information comprises: a time-frequency resource occupied by the CSR information. ### Claim 12 (depends on 9) The base station according to claim 9, wherein the transmitter is further configured to: before the receiver receives the CSR information that is sent by the user equipment, send configuration information to the user equipment, wherein the configuration information comprises: feedback manner information of different group granularities of the one or more group granularities. ### Claim 13 User equipment, comprising: a receiver, configured to receive a feedback mode indication sent by a base station, wherein the feedback mode indication instructs the user equipment to feed back channel state report (CSR) information using a first group granularity of one or more group granularities, wherein each group granularity of the one or more group granularities comprises at least one spatial flow, and a quantity of spatial flows comprised in each group granularity of the one or more group granularities is less than a quantity of spatial flows comprised in each code word used for transmission between the user equipment and the base station; a processor, configured to measure channel quality information of each spatial flow used to transmit data between the user equipment and the base station, and obtain the CSR information according to the channel quality information, wherein the CSR information comprises a plurality of sets of CSR information, each set of the plurality of sets of CSR information has the first group granularity, and wherein the CSR information that is sent using the first group granularity comprises channel quality information of each spatial flow used to transmit data between the user equipment and the base station; and a transmitter, configured to send the CSR information to the base station according to the feedback mode indication received by the receiver, wherein sending the CSR information to the base station causes the base station to determine, for each set of the plurality of sets of CSR information, information about an average value of channel quality of spatial flows in the respective set, and information about a difference between the channel quality of each spatial flow in the respective set and the average value according to the channel quality information of each spatial flow in the respective set. ### Claim 14 (depends on 13) The user equipment according to claim 13, wherein the receiver is further configured to: before the processor measures the channel quality information of each spatial flow used to transmit data between the user equipment and the base station, receive configuration information sent by the base station, wherein the configuration information comprises: a quantity of spatial flows comprised in each group granularity of the one or more group granularities. ### Claim 15 (depends on 13) The user equipment according to claim 13, wherein the receiver is further configured to: before the processor measures the channel quality information of each spatial flow used to transmit data between the user equipment and the base station, receive configuration information sent by the base station, wherein the configuration information comprises: a time-frequency resource occupied by the CSR information. ### Claim 16 (depends on 13) The user equipment according to claim 13, wherein the receiver is further configured to: before the processor measures the channel quality information of each spatial flow used to transmit data between the user equipment and the base station, receive configuration information sent by the base station, wherein the configuration information comprises: feedback manner information of different group granularities of the one or more group granularities.