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The cooperative medium access control (CoopMAC) protocol in the presence ofrandomly-distributed nodes and shadowing is considered. The nodes are assumedto be distributed according to a homogeneous two-dimensional Poisson pointprocess. A new approach is proposed for helper selection and throughputperformance analysis which depends on the shadowing parameters as well as thedistribution of helpers. In the proposed protocol, the potential helpers aredivided into several tiers based on their distances from the source anddestination in a way that the lower the tier index, the higher its priority.When there are several helpers of the same tier, the helper that is lessaffected by shadowing is chosen for cooperation. Upper and lower bounds arederived for the average cooperative throughput of the proposed CoopMACprotocol. It is observed that the proposed scheme readily outperforms theconventional CoopMAC protocol in having larger average throughput. It is alsoseen that the cooperative throughput of the proposed scheme approaches theupper bound when the density of nodes increases.

A New Approach for Helper Selection and Performance Analysis in Poisson CoopMAC Networks