基于DSR协议的区域路由研究

Study on Zone Routing Based on DSR Protocol

动态源路由(DSR,Dynamic Source Routing)协议是典型的按需Ad Hoc路由协议。其缺点在于路由发现和维护过程对网络拓扑变化反映较慢,难以满足对延迟要求高的实时视频业务的传输。针对原DSR协议的不足之处,本文在DSR的基础上增加了区域的概念,并给出了DSR区域路由协议,ZRDSR(Zone-Routing Based DSR)。在ZRDSR中,每个节点都维护一个区域状态表,并对此区域状态表进行及时更新。节点通过区域状态表能获知自己周围的拓扑情况,并将其用于路由发现和路由恢复过程,从而降低路由发现次数,减小路由发现延迟和路径恢复延迟,仿真实验结果表明,采用区域路由方式的DSR协议路由失效次数比原DSR协议减少了70%以上,极大提高了传输性能。

DSR （Dynamic Source Routing）protocol is a representative of on-demand Ad Hoc routing protocols. The deficit is that it takes a long time for DSR to adapt change of network topology, causing large delay, which doesn＇t meet the performance requirement for transmission of real-time traffics. Aimed at decreasing route discovery delay and frequency of route discovery, a new DSR proto- col ZRDSR（Zone-Routing Based DSR） is proposed in this paper, in which zones concept is introduced. In ZRDSR, every node maintains a zone status table and update it in time so that nodes will be aware of the topology changes from the zone status table. By using the zone status table in route discovery and route recovery, the frequency and delay of route discovery and route recovery can be reduced. The experiment result in simulation showed that the ZRDSR reduced the frequency of link failure more than 70 percentage and greatly improved the performance.