Improved Power Saving Mechanism to Increase Unavailability Interval in IEEE 802.16e Networks

Kyunghye LEE  Youngsong MUN  

Publication
IEICE TRANSACTIONS on Communications   Vol.E95-B   No.4   pp.1414-1418
Publication Date: 2012/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.1414
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
Keyword: 
IEEE 802.16e,  mobile WiMAX,  energy consumption,  power management,  sleep mode,  

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Summary: 
To manage limited energy resources efficiently, IEEE 802.16e specifies sleep mode operation. Since there can be no communication between the mobile station (MS) and the serving base station (BS) during the unavailability interval, the MS can power down its physical operation components. We propose an improved power saving mechanism (iPSM) which effectively increases the unavailability interval of Type I and Type II power saving classes (PSCs) activated in an MS. After investigating the number of frames in the unavailability interval of each Type II PSC when used with Type I PSC, the iPSM chooses the Type II PSC that yields the maximum number of frames in the unavailability interval. Performance evaluation confirms that the proposed scheme is very effective.