Mobility

Interaction Between Hidden Node Collisions and Congestions in Multihop Wireless Ad-Hoc Networks

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Executive Summary

In this paper, the authors study the performance of the IEEE 802.11 MAC protocol and its impact on the transport layer performance in multi-hop wireless ad-hoc networks. They focus on the hidden node problem that effects heavily the end-to-end delay and the packet loss probability. Through a mathematical analysis, they compute the packet loss probability as a function of the load. They develop a simplified model of a multi-hop wireless network and they use it to analyze the interaction between collision and congestion. They find that reducing the size of the MAC output queue can increase the applications throughput. This is done by setting the adequate buffer size that makes congestions and collisions operate in the same region.

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