Analytical Study of the Outage Probability of ALOHA and CSMA in Bounded Ad Hoc Networks

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The performance of the ALOHA and CSMA protocols is evaluated within a bounded ad hoc network. The authors' network model comprises of packets being distributed in finite space and time according to a 3-D PPP. Upon the formation of each packet, it is transmitted to its intended destination located a fixed distance away, using a fully-distributed MAC protocol. If the SINR of the received packet falls below a certain threshold any time during its transmission, the packet is received in outage. The evaluation metric of their network is outage probability, which is directly related to throughput. Approximate analytical expressions are derived for the outage probability of the different MAC protocols as a function of the transmission density and the physical size of the network, and verified by simulations.