Protocol to support adaptive station-dependent channel state information feedback rate in multi-user communication systems

A method for wireless communications, comprising:

• determining if channel state information (CSI) needs to be updated;
• receiving a polling message from an apparatus;
• and
• transmitting CSI feedback to the apparatus in response to the polling message, if it is determined that the CSI needs to be updated.

An apparatus for wireless communications, comprising:

• circuit configured to determine if channel state information (CSI) needs to be updated;
• a receiver configured to receive a polling message from an apparatus;
• and
• a transmitter configured to transmit CSI feedback to the apparatus in response to the polling message, if it is determined that the CSI needs to be updated.

An apparatus for wireless communications, comprising:

• means for determining if channel state information (CSI) needs to be updated;
• means for receiving a polling message from an apparatus;
• and
• means for transmitting CSI feedback to the apparatus in response to the polling message, if it is determined that the CSI needs to be updated.

A computer-program product for wireless communications, comprising a computer-readable medium comprising instructions executable for:

• determining if channel state information (CSI) needs to be updated;
• receiving a polling message from an apparatus;
• and
• transmitting CSI feedback to the apparatus in response to the polling message, if it is determined that the CSI needs to be updated.

An access point for wireless communications, comprising:

• a plurality of antennas,
• a transmitter configured to transmit, via the plurality of antennas, separate polling messages to poll each of a plurality of apparatuses for channel state information (CSI) feedback;
• and
• a receiver configured to receive, in response to the polling messages, CSI feedback from one or more of the polled apparatuses.

A station for wireless communications, comprising:

• at least one antenna,
• circuit configured to determine if channel state information (CSI) needs to be updated;
• a receiver configured to receive, via the at least one antenna, a polling message from an apparatus;
• and
• a transmitter configured to transmit CSI feedback to the apparatus in response to the polling message, if it is determined that the CSI needs to be updated.