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Power saving mechanisms with sleep-mode operations have been used in IEEE 802.16e in order to extend the battery lifetime of mobile devices. The standard sleep-mode operation needs to meet a given delay constraint. However, it may incur unnecessary energy consumption due to frequent state transitions. In this paper, the authors propose a new energy-efficient sleep-mode operation while meeting a given delay requirement. They apply an M/G/1 queue model with multiple vacations for downlink traffic in an error-free environment in order to evaluate the energy efficiency performance of the proposed sleep-mode operation in terms of packets/Joule.
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