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Coexistence, and hence interference mitigation, across multiple wireless bodyarea networks (WBANs) is an important problem as WBANs become more pervasive.Here, two-hop relay-assisted cooperative communications using opportunisticrelaying (OR) is proposed for enhancement of coexistence for WBANs. Suitabletime division multiple access (TDMA) schemes are employed for both intra-WBANand inter-WBANs access protocols. To emulate actual conditions of WBAN use,extensive on-body and inter-body "everyday" channel measurements are employed.In addition, a realistic inter-WBAN channel model is simulated to investigatethe effect of body shadowing and hub location on WBAN performance in enablingcoexistence. When compared with single-link communications, it is found thatopportunistic relaying can provide significant improvement, in terms ofsignal-to-interference+noise ratio (SINR), to outage probability and levelcrossing rate (LCR) into outages. However, average outage duration (AOD) is notaffected. In addition a lognormal distribution shows a better fit to receivedSINR when the channel coherence time is small, and a Nakagami-m distribution isa more common fit when the channel is more stable. According to the estimatedSINR distributions, theoretical outage probability, LCR and AOD are shown tomatch the empirical results well.

Coexistence and Interference Mitigation for Wireless Body Area Networks: Improvements using On-Body Opportunistic Relaying