NDLI: Link Positions Matter: A Noncommutative Routing Metric for Wireless Mesh Network

Content Provider	IEEE Xplore Digital Library
Author	Jakllari, G. Eidenbenz, S. Hengartner, N. Krishnamurthy, S.V. Faloutsos, M.
Copyright Year	2008
Description	Author affiliation: Univ. of California, Riverside, CA (Jakllari, G.)
Abstract	We revisit the problem of computing the path with the minimum cost in terms of the expected number of link layer transmissions (including retransmissions) in wireless mesh networks. Unlike previous efforts, such as the popular ETX, we account for the fact that MAC protocols (including the IEEE 802.11 MAC) incorporate a finite number of transmission attempts per packet. This in turn leads to our key observation: the performance of a path depends not only on the number of the links on the path and the quality of its links, but also, on the relative positions of the links on the path. Based on this observation, we propose ETOP, a path metric that accurately captures the expected number of link layer transmissions required for reliable end-to-end packet delivery. We analytically compute ETOP, which is not trivial, since ETOP is a noncommutative function of the link success probabilities. Although ETOP is a more involved metric, we show that the problem of computing paths with the minimum ETOP cost can be solved by a greedy algorithm. We implement and evaluate a routing approach based on ETOP on a 25-node indoor mesh network. Our experiments show that the path selection with ETOP consistently results in superior TCP goodput (by over 50% in many cases) compared to path selection based on ETX. We also perform an in-depth analysis of the measurements to better understand why the paths selected by ETOP improve the TCP performance.
Starting Page	744
Ending Page	752
File Size	444512
Page Count	9
File Format	PDF
ISBN	9781424420254
ISSN	0743166X
DOI	10.1109/INFOCOM.2008.125
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-04-13
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Routing Wireless mesh networks Costs Throughput Computer networks Media Access Protocol Mesh networks Collaborative work Government Communications Society
Content Type	Text
Resource Type	Article
Subject	Computer Science Electrical and Electronic Engineering

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