多信道SW-ARQ系统基于带休假的M/G/1排队模型时延性能分析

Analysis of delay performance of multichannel SW-ARQ based on M/G/1 model with vacation

在考虑分组长度、信道传输质量的影响下,运用带休假的M/G/1排队模型分析SW-ARQ系统的时延性能指标。分别获得了单信道SW-ARQ系统和多信道SW-ARQ系统分组平均等待时延和系统平均时延解析表达式,并将两种系统的时延性能指标分别进行分析比较。分析结果表明,当分组长度较大时,采用多信道SW-ARQ可以获得较小的系统平均时延,提高系统的传输可靠性。最后通过数值模拟比较分析了单信道SW-ARQ系统和多信道SW-ARQ系统下分组长度、传输正确率以及到达率对系统平均时延的影响。

In consideration of packet length and channel transmission quality,established a queuing model of multi-channel SW-ARQ scheme with vacation sententiously and availably by using the equivalent service delay method,measured the expressions of systems main performance,such as systems average waiting time,average delay time and so on,analysis and compa-rison of time-delay performance of the single-channel SW-ARQ and multi-channel SW-ARQ.The analysis results show that,when the packet length is large,the multi-channel SW-ARQ achieves lower delay time and improves the reliability of the system.At last,the influence of data packet length and correct ratio of the data packets transmission on system delay is analyzed by numerical simulation.