Mobility

Local Estimation of Probabilities of Direct and Staggered Collisions in 802.11 WLANs

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Executive Summary

Current 802.11 networks do not typically achieve the maximum potential throughput despite link adaptation and cross-layer optimization techniques designed to alleviate many causes of packet loss. A primary contributing factor is the difficulty in distinguishing between various causes of packet loss, including collisions caused by high network use, co-channel interference from neighboring networks, and errors due to poor channel conditions. In this paper, the authors propose a novel method for estimating various collision type probabilities locally at a given node of an 802.11 network. Their approach is based on combining locally observable quantities with information observed and broadcast by the Access Point (AP) in order to obtain partial spatial information about the network traffic.

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