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Experimental Analysis of Backpressure Scheduling in IEEE 802.11 Wireless Mesh Networks
Citation key YSMK-EABSI8WMN-11
Author Yoo, Jaeyong and Sengul, Cigdem and Merz, Ruben and Kim, JongWon
Title of Book Proceedings of International Conference on Communications (ICC '11)
Pages 1–5
Year 2011
ISBN 978-1-61284-232-5
Online ISBN 978-1-61284-231-8
ISSN 1550-3607
DOI http://dx.doi.org/10.1109/icc.2011.5962581
Location Kyoto, Japan
Address New York, NY, USA
Month June
Publisher IEEE
Abstract Transmission scheduling to improve the capacity in wireless mesh networks (WMNs) is challenging. One promising candidate solution is backpressure scheduling, which was proved to provide throughput optimality and queue stability in theory. Additionally, several recent practical systems that implement approximations of backpressure scheduling show performance benefits in WMNs based on IEEE 802.11, which is the most widely adopted MAC protocol. However, a detailed analysis of the queue stability is still missing for practical systems. In this paper, we experimentally show that applying backpressure scheduling over IEEE 802.11-based WMNs presents significant queue instability due to the delayed interaction between MAC and network layers. To understand how and when queue instability occurs, we present weighted backpressure scheduling (WBS), which uses two additional weight factors β and γ for the queue lengths of a node and its next-hop node when computing the backpressure value. By using WBS, we experimentally investigate the interactions between the components of backpressure scheduling implementations, i.e., packet scheduling and link scheduling, and show that, usually, β>γ leads to queue stabilization.
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