Patent ID: 7848273

Claim:
A system for transmitting a traffic indication message in a Broadband Wireless Access communication system, the system comprising: a base station (BS) for transmitting the traffic indication message to mobile subscriber stations (MSSs) in a listening interval, wherein the traffic indication message includes traffic indication indexes and a number of MSS groups, a number of the traffic indication indexes being identical to the number of the MSS groups, each of the MSS groups includes a predetermined number of MSSs, each of the traffic indication indexes is assigned to each of the MSS groups, and includes a bitmap including a predetermined number of bits, the predetermined number of bits is identical to the number of the MSSs included in each of the MSS groups, each of the predetermined number of the bits is assigned to each of the MSSs included in each of the MSS groups, and represents operation instruction information for each of the MSSs, and wherein the operation instruction information indicates one of at least three operations: a first operation in which a corresponding MSS immediately state transitions to a sleep mode, without waiting for reception of a next traffic indication message for the listening interval, a second operation in which the corresponding MSS maintains the sleep mode, after expiration of the listening interval, or a third operation in which the corresponding MSS state transitions to an awake mode.