Title
Delay analysis and optimization of bandwidth request under unicast polling in IEEE 802.16e over gilbert-elliot error channel
Author
Hwang, E.
Kim, K.J.
Roijers, F.
Choi, B.D.
TNO Informatie- en Communicatietechnologie
Publication year
2009
Abstract
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 Gilbert-Elliot 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. Copyright © 2009 The Institute of Electronics, Information and Communication Engineers.
Subject
Informatics
Analytical model
Bandwidth reservation
Channel conditions
Delay analysis
Loss probability
Mobile station
Multicasts
Retransmissions
Runtimes
Simulation result
Tolerable delay
Total loss
Unicast polling
Wireless transmissions
Error detection
Mathematical models
Numerical analysis
Optimization
Surveys
Probability distributions
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DOI
https://doi.org/10.1587/transcom.e92.b.3827
TNO identifier
360852
Source
IEICE Transactions on Communications, E92-B (12), 3827-3835
Document type
article