Channel state information feedback method and apparatus in wireless communications system

A apparatus in a wireless communications system, the apparatus comprising:

• a processor;
• and
• a non-transitory computer readable storage medium storing programming for execution by the processor, wherein the programming, when executed by the processor, instructing the apparatus to:
• generate a multiple input multiple output (MIMO) beamforming (BF) feedback frame, wherein the MIMO BF feedback frame comprises information indicating a transmit antenna subset of an initiator and one or more channel state information blocks that represent channel state information between the transmit antenna subset of the initiator and one or more receive antennas of a responder, and wherein the transmit antenna subset of the initiator is determined based on one or more user mask fields of a MIMO spatial configuration frame sent by the initiator;
• and
• sending, by the responder, the MIMO BF feedback frame.

An apparatus in wireless communications system, the apparatus comprising:

• a processor;
• and
• a non-transitory computer readable storage medium storing programming for execution by the processor, wherein the programming, when executed by the processor, instructing the apparatus to:
• send a multiple input multiple output (MIMO) spatial configuration frame, wherein the MIMO spatial configuration frame comprises one or more user mask fields;
• and
• receive a multiple input multiple output (MIMO) beamforming (BF) feedback frame, wherein the MIMO BF feedback frame comprises information indicating a transmit antenna subset of an initiator and one or more channel state information blocks that represent channel state information between the transmit antenna subset of the initiator and one or more receive antennas of a responder, and wherein the transmit antenna subset of the initiator is determined based on the one or more user mask fields of the MIMO spatial configuration frame.