Stephanie M. Soares
Marcelo M. Carvalho
ABSTRACT
Given the widespread adoption of the IEEE 802.11 standard in a number of battery-operated devices, the power save mode (PSM) defined for both Basic Service Sets (BSS), and Independent Basic Service Sets (IBSS), are key elements for an energy-efficient operation. In the IEEE 802.11 PSM for IBSS, time is divided into beacon intervals, which is further divided into a traffic announcement window and a data window. Every station who wants to transmit a data frame must first send an announcement traffic information message (ATIM) frame to the intended receiver. Only the stations who successfully exchange ATIM frames may remain active for the follwing data window, while the rest of the stations go to sleep mode. In spite of its importance to day-to-day use, very few works have addressed the analytical modeling of the IEEE 802.11 PSM for IBSS. In this paper, we revisit an analytical model previously proposed in the literature that is based on a discrete-time Markov chain for saturated networks under perfect channel conditions. Thus, rather than simplifying the solution and focus on a subset of states related to the data window only, new expressions for numerical computation of the overall steady-state solution are presented, which take into account all states of the original Markov chain explicitly, including the impact of consecutive ATIM frame retransmissions through distinct beacon intervals. Hence, different from the results previously reported, where average throughput may surprisingly increase with the number of stations, our results show the intuitive and expected behavior of lower throughput values as the number of stations increases. Moreover, it is shown that the average network throughput is typically lower than it was previously predicted. Finally, we also investigate the impact of the number of ATIM frame retransmissions between consecutive beacon intervals on the average network throughput.
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Index Terms
- Revisiting the Analytical Modeling of the IEEE 802.11 Power Save Mode for Independent Basic Service Sets (IBSS)
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