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Title:Modeling of IEEE 802.11 based Multi-rate Wireless Ad Hoc Networks and Its Application towards Optimal Network Operation
Author(s):Kim, Tae-Suk; Yang, Yong; Hou, Jennifer C.
Subject(s):wireless networks
ad hoc networks
wireless ad hoc networks
Abstract:In this paper, we derive an analytical model to evaluate the effect of jointly tuning the carrier sense threshold and employing multiple data rates on the network capacity in multi-rate, multi-hop wireless networks. The proposed model characterizes the channel status within the carrier sense range of an individual transmitter. The per-node throughput attained by each transmitter is then obtained by deriving the probability that each state occurs and its expected duration. The effect of multiple channel rates provided by IEEE 802.11 a/b/g protocols is also taken into account. As a preamble to devising a localized algorithm for tuning systems parameters, we propose a control reference and derive, for each data rate, its optimal value, the range of which remains approximately constant regardless of network dynamics. Based on the insight shed from the analytical model, we then devise a distributed and localized algorithm with which each node first selects a data rate and the associated carrier sense threshold based on the network condition, and then tunes the contention window size so that the value of the control reference measured stays in its optimal range. We show via simulation that the proposed algorithm, as compared to the existing IEEE 802.11 DCF protocol, yields a higher network capacity.
Issue Date:2007-04
Genre:Technical Report
Other Identifier(s):UIUCDCS-R-2007-2841
Rights Information:You are granted permission for the non-commercial reproduction, distribution, display, and performance of this technical report in any format, BUT this permission is only for a period of 45 (forty-five) days from the most recent time that you verified that this technical report is still available from the University of Illinois at Urbana-Champaign Computer Science Department under terms that include this permission. All other rights are reserved by the author(s).
Date Available in IDEALS:2009-04-22

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