Effects of Interference on Wireless Mesh Networks: Pathologies and a Preliminary Solution

–We highlight two fundamental problems that

degrade the throughput of wireless mesh networks today.

First, severe performance degradation can occur when

sources send more traffic than what the network can support. The degradation can be sharp even in a simple

setting of a single flow that traverses a network of two

links. Second, current routing protocols fail to identify

high throughput routing paths even when they exist. The

underlying culprit in both cases is interference that is fundamental to wireless networks.

As a first step towards a solution, we develop a novel

approach to systematically account for and control interference in the network. Our approach uses (an approximation of) a formal model of interference to estimate the

maximum rate at which flows can safely send traffic without overloading the network. Simulation and testbed experiments show that it can improve network throughput

by as much as 50-100% in some configurations.

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Copyright © 2007 by the Association for Computing Machinery, Inc. Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, to republish, to post on servers, or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from Publications Dept, ACM Inc., fax +1 (212) 869-0481, or permissions@acm.org. The definitive version of this paper can be found at ACM’s Digital Library --http://www.acm.org/dl/.

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