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Performance analysis of bursty service in relay systems with ARQ protocol

In this paper, we propose a framework to analyze the performance of relay-assisted networks. Bursty service, instead of infinite information source, is considered and the arrival process of packets is modeled as a Poisson process. Automatic repeat request (ARQ) protocol is adopted to deal with the transmission errors. Markov chain model is first established based on the node states to investigate the transmission process of packets. Then the stationary distribution of the node states is formulated and based on the steady-state probabilities, some typical metrics for system performance, including the packet loss rate, the average transmission delay and the average system throughput, are derived. The timeliness of packets is also taken into account and the effective system throughput is further obtained. We demonstrate by numerical analysis that the packet arrival rate should be limited within a certain value to ensure that the packet loss rate below the threshold.