Patent ID: 7573841

Claim:
A system for transmitting a traffic indication (MOB_TRF-IND) message in a Broadband Wireless Access communication system, comprising: a Base Station (BS) for transmitting the MOB_TRF-IND message including a sleep mode ID (SLPID) Group Indication Bitmap and a Traffic Indication Bitmap, wherein the SLPID Group Indication Bitmap includes N SLPID Group Indication bits, each of the N SLPID Group Indication bits corresponding to each of N SLPID groups, and the N SLPID groups are generated by grouping N*M SLPIDs, wherein each of the N SLPID Group Indication bits indicates that there is no traffic for M Mobile Stations (MSs) mapped to M SLPIDs included in a corresponding SLPID group or that there is traffic for at least one of the M MSs mapped to the M SLPIDs included in the corresponding SLPID group, wherein the Traffic Indication Bitmap includes multiples of an M-bit long Traffic Indication unit, the M-bit long Traffic Indication unit being added to the MOB_TRF-IND message when an SLPID Group Indication bit indicates that there is traffic for at least one MS among the M MSs mapped to the M SLPIDs included in an SLPID Group, the M-bit long Traffic Indication unit including M bits, each of the M bits corresponds to each of the M MSs mapped to the M SLPIDs included in the SLPID Group, each of the M bits indicating a negative indication that indicates that there is no traffic directed to a corresponding MS or a positive indication indicates that there is traffic directed to the corresponding MS, and wherein an SLPID of an MS is uniquely assigned by the BS when the MS is instructed to enter a sleep mode.