Patent ID: 8848680

Claim:
A method of processing a frame by a mobile station in a wireless local area network system, the method comprising: receiving, by the mobile station from an access point, information about a station identifier having a first length and identifying the mobile station; receiving, by the mobile station from the access point, a first Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU) including a first very High Throughput Signal (VHT-SIG) field and a first PLCP Service Data Unit (PSDU); and transmitting, by the mobile station to the access point, a second PPDU including a second VHT-SIG field and a second PSDU, wherein the first VHT-SIG field includes a class type and a first identifier field, the class type being set to a first value indicating that the first PPDU is destined to the mobile station, the first identifier field indicating a partial identifier formed from the station identifier and having a second length shorter than the first length, and wherein the second VHT-SIG field includes a second class type and a second identifier field, the second class type being set to a second value indicating that the second PPDU is destined to the access point, the second identifier field indicating a part of a Basic Service Set Identifier (BSSID) identifying the access point.