A Probabilistic Approach for the Determination of Sleep Interval in IEEE 802.16e

Jung-Ryun REE  Jeong Woo LEE  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.8   pp.2743-2746
Publication Date: 2009/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.2743
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
power-saving mode,  probabilistic approach,  conditional distribution,  

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The IEEE 802.16e standard adopts a power-saving mode (PSM) with a truncated binary exponent (TBE) algorithm for determining sleep intervals. Although the TBE algorithm allows more flexibility in determining sleep intervals, it does not consider the network delay of a response packet. In this letter, we suggest PSM that is based on the conditional probability density function (c-pdf) for the response packet's arrival time at the base station (BS). The proposed algorithm determines sleep interval placement so that the response packet may arrive at the BS during each sleep interval with the same conditional probability. The results show that the proposed algorithm outperforms the TBE algorithm with respect to the packet-buffering delay in the BS and the energy consumption of a mobile station (MS).