动态时延的非均匀Ad Hoc网络MAC设计和分析∗

摘要

A hybrid slot MAC protocol based on reservation mechanism for multi-density ad hoc network, short for RTV, is presented in this paper. The service is distinguished into the reservation and the contention-free in RTV for providing different qualities of access transportation service. The variable delay reservation algorithm is adapted to support different time-delay services, which solves the problem that TDMA isn’t applicable to the multi-density network. The throughputs and slot-utilization rate of the RTV are obtained. The simulation results indicate that the RTV presents good performance on throughputs and slot-utilization rate in large multi-density network.%针对密度非均匀Ad Hoc网络,提出了一种基于预留的时隙混合类MAC——RTV协议。该协议将业务区分为预留和非预留,以提供不同质量的接入传输服务。通过时延调整预留算法来满足多种预留业务的不同时延要求。同时,通过预留机制解决了 TDMA 技术不适应于密度非均匀网络的问题。最后,通过数学建模分析得到了协议的时隙利用率和系统吞吐量。仿真实验结果表明：在密度非均匀的大型Ad Hoc网络中,RTV协议可以为混合业务的传输提供时延保障,并在时隙利用率和吞吐量方面呈现出较好的性能。