Outage Behavior of Wireless Sensor Networks with Asymmetric Traffic Demands Using Regenerative Bidirectional Relaying

Abstract

In the paper, outage behavior of a wireless sensor network was investigated, where two geographically distributed source-nodes communicate with each other using a regenerative bidirectional relaying. Unlike most of the existing studies, the two source-nodes were assumed to have different rate demands. First, achievable rate region of the network under investigation was analyzed, and then based on the definition of outage behavior of the network, the network was evaluated in terms of the outage probability (the probability of an occurring of a transmission outage at one source-node), giving the corresponding closed-form expressions. In order to provide more insights, an asymptotic expression of the outage probability was derived at high signal-tonoise ratio. It was interestingly found that the level of asymmetry of the two sources’ rate demands has significant impact on the network outage probability, when the level exceeds a threshold, the network outage probability is only related to one-way relay channel. Simulation experiments confirmed the correctness of the derived expression, and corroborated the findings.