Mobility

Detecting Selfish Carrier-Sense Behavior in WiFi Networks by Passive Monitoring

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Executive Summary

With the advent of programmability in radios, it is becoming easier for wireless network nodes to cheat to obtain an unfair share of the bandwidth. In this work the authors study the widely used 802.11 protocol and present a solution to detect selfish carrier-sensing behavior where a node raises the CCA (Clear Channel Assessment) threshold for carrier sensing, or simply does not sense carrier (Possibly randomly to avoid detection). The approach is based on detecting any asymmetry in carrier-sense behavior between node pairs and finding multiple such witnesses to raise confidence.

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