摘要:
该文对Ad hoc网络的MAC层协议进行了研究,通过对无线令牌环协议(WTRP)进行改进,提出了一种新的具有QoS保障的无竞争的分布式并行无线轮询访问协议(DPWPAP),并采用嵌入Markov链和概率母函数的分析方法,用限定服务规则进行了系统建模,在系统模型的基础上得到了系统的平均排队队长以及平均等待时间的解析结果.理论分析和仿真结果是一致的,表明该协议的排队等待延迟和平均等待队列长度均比WTRP有很大降低,稳定性大大增强,更加适用于对时延要求较高的业务.
Abstract:
After studying the MAC protocol of Ad hoc network and by modifying the Wireless Token Ring Protocol (WTRP), a new uncontested Distributed Parallel Wireless Polling Access Protocol (DPWPAP) that can provide MAC QoS guarantees for Ad hoc network is presented, and the mathematical model is established by the embedded Markov chain theory and the probability generating function method. Based on it, the mean value of queue length and message waiting time are explicitly obtained. The simulation results indicate minor errors are introduced by the established system, and also show that the average delay and average queue length in DPWPAP system are much more lower than in WTRP system, the stability is enhanced highly. As a result, it is a better MAC protocol for the services that require lower delay.
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