Mobility

Evaluating the Information Efficiency of Multi-Hop Networks With Carrier Sensing Capability

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Executive Summary

In this paper, the authors consider the performance of the CSMA MAC protocol in multi-hop ad hoc networks in terms of "Aggregate multi-hop information efficiency". Their model consists of a wireless network where transmitter nodes are distributed according to a homogeneous 2-D Poisson point process, and packets are generated also following a Poisson distribution. Each packet is forwarded to its destination a fixed distance away from the source through an arbitrary number of hops. Approximate analytical expressions are derived for the outage probability of CSMA in its various incarnations, considering different values for the sensing threshold (related to the backoff decision) and the required communication threshold (which determines a correct packet reception).

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