Enhancing the Power Saving Mode in IEEE 802.11 Distributed Coordinator Function Using Traffic Scheduling
نویسنده
چکیده
In IEEE 802.11 Power Saving (PS) mode specified for Independent Basic Service Set (IBSS), mobile stations announce their pending data packets within Announcement Traffic Indication Message (ATIM) window immediately after the reception of Time Synchronization Function (TSF) beacon. This paper proposed modifications to the PS mode by transmitting the TSF beacon at the end of each ATIM window. Upon actively overhearing the traffic announcements, a mobile station can function as the centralized coordinator by piggyback transmission scheduling information within the beacon. Different traffic scheduling mechanisms are proposed in this paper that will ensure the data packets transmission to be contention-free and minimize the total time that mobile stations have to stay in the active state. The performance of the proposed algorithms is analyzed using simulation method. The results show that the proposed algorithms improve the power efficiency and performance compared with original IEEE 802.11 protocol. Key–Words: Ad Hoc Network, IEEE 802.11 MAC protocol, Power-efficient, Scheduling.
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