Research on the Delay Performance of GBN-ARQ and SR-ARQ Systems in Wireless Data Transmission
Suoping Li, PR China · Signal Processing · 2009
Automatic Repeat Request protocols of both GBN-ARQ and SR-ARQ are the basic error-control schemes in wireless communication.In this paper,through analyzing the transmission schemes,the delay performances of both above protocols are studied based on Equivalent Service Time,which takes into account the packet length(m unit-times),the propagation delay and the procession delay and the receiver feedback delay.We also educed the formulations of the mean packet waiting time and mean packet service time, which can be applied to control the sliding windows length of both svstems.So the optimum delay and throughput performances of both systems can be gotten by changing the sliding window length adaptively according to the change of transmission conditions Furthermore, the simulations show that the variations of sliding windows length and packet length can bring more effect on GBN-ARQ than on SR-ARQ, and also prove that the transmission efficiency of SR-ARQ is better than GBN-ARQ theoretically.