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Delay Analysis and Optimization of Bandwidth Request under Unicast Polling in IEEE 802.16e over GilbertElliot Error Channel
Eunju HWANG Kyung Jae KIM Frank ROIJERS Bong Dae CHOI
Publication
IEICE TRANSACTIONS on Communications
Vol.E92B
No.12
pp.38273835 Publication Date: 2009/12/01
Online ISSN: 17451345
DOI: 10.1587/transcom.E92.B.3827
Print ISSN: 09168516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: IEEE 802.16e, bandwidth request, unicast polling, GilbertElliot error channel,
Full Text: PDF(578.2KB)>>
Summary:
In the centralized polling mode in IEEE 802.16e, a base station (BS) polls mobile stations (MSs) for bandwidth reservation in one of three polling modes; unicast, multicast, or broadcast pollings. In unicast polling, the BS polls each individual MS to allow to transmit a bandwidth request packet. This paper presents an analytical model for the unicast polling of bandwidth request in IEEE 802.16e networks over GilbertElliot error channel. We derive the probability distribution for the delay of bandwidth requests due to wireless transmission errors and find the loss probability of request packets due to finite retransmission attempts. By using the delay distribution and the loss probability, we optimize the number of polling slots within a frame and the maximum retransmission number while satisfying QoS on the total loss probability which combines two losses: packet loss due to the excess of maximum retransmission and delay outage loss due to the maximum tolerable delay bound. In addition, we obtain the utilization of polling slots, which is defined as the ratio of the number of polling slots used for the MS's successful transmission to the total number of polling slots used by the MS over a long run time. Analysis results are shown to well match with simulation results. Numerical results give examples of the optimal number of polling slots within a frame and the optimal maximum retransmission number depending on delay bounds, the number of MSs, and the channel conditions.

