一种具备实时意识的Ad hoc路由协议

An Ad hoc Routing Protocol Equipped with Real-time Sense

在任何类型的网络中,影响实时数据传输的因素无非是传输的延迟和包的丢失.Ad hoc网络拓扑结构的动态变化使得实时业务的服务质量(QoS)更难得到保障.包的丢失不仅会造成包的错误,还会为后继的包的传输带来错误[1].当今适用于Adhoc网络的路由协议都是针对大规模的Ad hoc网络,并且都趋向于减少路由开销,相应的带来很多影响数据实时性的弊端.本文会分析找出这些弊端的来源并加以改进,提出一个简化的实时DSR协议-MRDSR.仿真实验证明,MRDSR降低了传输的丢包率,降低了点到点的延迟.

Real-time data is very sensitive for delay and packet losses. And the changing topology in Ad hoe network make it much harder to guarantee the QoS on real-time data. A lost frame will not only cause error within its frame but also introduce error propaga- tion in the following frames. The most common routing protocols today are reactive routing protocols that focus on scalability for very large network and to reduce the routing overhead. Accordingly, it brings lots fault to the transfer of real-time data. This paper will an- alyze the current protoeol＇s weakness for real-time transferring and give some solution to rectify these faults. Finally we propose a Multipath Real-time DSR protocol, MRDSR. Simulation results show that the new protocol is improved compared to the original pro- toeol. End-to-end delay and packet loss rate are all reduced, and the transmission efficiency is improved at the same time.