SR ARQ packet delay statistics on Markov channels in the presence of variable arrival rate

In this letter we investigate the packet delay statistics of a fully reliable Selective Repeat ARQ scheme by considering a Discrete Time Markov Channel with non-instantaneous feedback and assigned round-trip delay m. Our focus is on studying the impact of the arrival process on the delay experienced by a packet. An exact model is introduced to represent the system constituted by the transmitter buffer, the m round-trip slots, and the channel state. By means of this model, we evaluate and discuss the delay statistics and we analyze the impact of the system parameters, in particular the packet arrival rate, on the delay statistics.