Patent ID: 8787341

Claim:
A method for reporting channel information in a wireless local area network system, the method comprising; receiving, by a responding station, a data block for requesting a modulation and coding scheme (MCS) feedback from a requesting station, the data block including a data field and a stream indicator indicating a number of spatial streams for the responding station; determining, by the responding station, the MCS feedback based on the data block; and, transmitting, by the responding station, the MCS feedback to the requesting station, the MCS feedback including a recommended MCS field and a recommended number of spatial streams field, wherein the recommended MCS field indicates an index value of a recommended MCS, wherein the recommended number of spatial streams field indicates a number of at least one recommended spatial stream, wherein the number of the at least one recommended spatial stream is equal to or less than the number of spatial streams for the responding station, and wherein if the number of the at least one recommended spatial streams is less than the number of the spatial streams for the responding station, the recommended MCS is estimated under an assumption that the requesting station will transmit the at least one recommended spatial stream which corresponds to at least one first spatial stream among the spatial streams for the responding station.