Energy Management Analysis and Enhancement in IEEE 802.16e WirelessMAN

One strategy for energy management is an indispensable component in the emerging IEEE 802.16e wireless metropolitan area networks (WirelessMAN) supporting mobility. An efficient energy saving mechanism is the basis for the guarantee of a long operating lifetime for a mobile subscriber station (MSS), because MSSs are normally powered by rechargeable batteries. In this paper, we will characterize and model the energy-saving scheme in the IEEE 802.16e WirelessMAN. A comprehensive analysis is performed to study the specified sleep mode with generalized traffic processes. The performance metrics are derived with respect to energy consumption and packet delay to evaluate the tradeoff in the energy management strategy. We then propose an enhanced scheme to offer favorable performance tradeoff by adaptively adjusting the sleep windows. The numerical result indicates that the new policy can significantly reduce power consumption. Simulation results are presented to validate the analytical model, which provides potential guidelines for the efficient management of limited energy.

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