Spatial flow determining method, base station, and user equipment

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.

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.

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.