METHOD AND APPARATUS OF LINK ADAPTATION IN WIRELESS LOCAL AREA NETWORK

摘要

A method of link adaptation performed by an access point supporting multi user (MU) multiple input multiple output (MIMO) in wireless local area network system is provided. The method includes transmitting, to a first station, a physical layer convergence procedure (PLCP) protocol data unit (PPDU) containing a modulation and coding scheme (MCS) request (MRQ) and receiving, from the first station, a MCS feedback (MFB) in response to the MRQ, wherein the first station is one of destination stations of MU-MIMO transmission performed by the access point, and the MFB includes a recommended MCS value computed, by the first station, on the assumption that the first station, as a member of the destination stations, receives data transmitted over at least one spatial stream allocated to the first station in MU-MIMO transmission.

主权项

1. A method for a wireless local area network, the method comprising:
receiving, by a responding station, a Multi User-Physical layer Protocol Data Unit (MU-PPDU) from a requesting station, the MU PPDU including a data frame, wherein the data frame includes a Quality of Service (QoS) Null frame that includes an ACK policy field that identifies an ACK policy for the responding station, wherein the ACK policy field is set to a value indicating that the ACK policy is an immediate ACK response, and wherein the QoS Null frame further includes a Modulation and Coding Scheme Feedback Request (MRQ) field that indicates whether the responding station is requested to send a Modulation and Coding Scheme Feedback (MFB); and transmitting, by the responding station, an acknowledgment (ACK) frame to the requesting station based on the ACK policy, wherein only when the MRQ field indicates that the responding station is requested to send the MFB does the ACK frame include a MCS estimate that is estimated by the responding station based on the MU-PPDU.