Detecting MAC Layer Back-Off Timer Violations in Mobile Ad Hoc Networks

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Executive Summary

In IEEE 802.11 based ad hoc networks, by simply manipulating the back-off timers and/or wait times prior to transmission, malicious nodes can cause a drastically reduced allocation of bandwidth to well-behaved nodes. This can result in causing bandwidth starvation and hence, a denial of service to legitimate nodes. The authors propose a combination of deterministic and statistical methods that facilitate detection of such misbehavior. With their approach, each of the nodes is made aware of the pseudo-random sequences that dictate the back-off times of all its one-hop neighbors.

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