Mobility

Joint Transmitter and Receiver Carrier Sensing Capability of CSMA in MANETs

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Executive Summary

This paper considers the performance of the CSMA protocol with joint transmitter-receiver sensing in a wireless mobile ad hoc network. In the authors' network model, packets belonging to specific transmitters arrive randomly in space and time according to a 3-D Poisson point process, and are then transmitted to their intended destinations using a fully-distributed CSMA MAC protocol. A packet transmission is considered successful if the received SINR is above a predefined threshold for the duration of the packet. Approximate expressions are derived for the outage probability of CSMA, and the role of joint transmitter-receiver sensing is evaluated. Furthermore, the optimal sensing thresholds for both the transmitter and receiver are derived, and shown to yield significant performance improvement.

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