Enhanced Power-Saving Mechanism to Maximize Operational Efficiency in IEEE 802.16e Systems

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A Power-Saving Mechanism (PSM) operates with sleep-mode and wake-mode, based on the receipt of requests for transition to each mode. The sleep-mode operation is manipulated by adjusting operating parameters such as the minimum sleep interval (T(min)) and the maximum sleep interval (T(max)). Interestingly, both energy consumption and the response delay of the request for a BS initiation of awakening are reciprocally affected by the relative sizes of these two operating parameters compared to the sleep duration (from the beginning of sleep-mode to that of wake-mode). To resolve this issue, this paper proposes a new PSM, called EPSM, which adaptively and simultaneously controls the operating parameters by efficiently reflecting the sleep duration. Moreover, depending on the current remaining energy state, this mechanism can also increase the available sizes of the operating parameters to be manipulated for achieving more intensive energy conservation. A numerical model is developed with a Markov chain for performance evaluation of the proposed mechanism pertaining to energy consumption and the response delay. The evaluation results substantiate that this mechanism can enhance energy conservation within reasonable response delay compared to the standard mechanism. Moreover, under an insufficient remaining energy state, the EPSM can prolong battery life while enduring an increasing response delay.
Publisher
IEEE-Inst Electrical Electronics Engineers Inc
Issue Date
2009-09
Language
English
Article Type
Article
Keywords

MANAGEMENT; MAC

Citation

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, v.8, no.9, pp.4710 - 4719

ISSN
1536-1276
DOI
10.1109/TWC.2009.081151
URI
http://hdl.handle.net/10203/19002
Appears in Collection
EE-Journal Papers(저널논문)
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