基于泛洪区域限定的改进DSR

Improved Dynamic Source Routing based on flood area limitation

针对动态源路由(Dynamic Source Routing,DSR)因泛洪路由请求包(Route Request,RREQ)而产生的高路由开销问题,提出基于区域的路由发现机制(Zone-based Route Discovery Mechanism,ZRDM)的DSR。ZRDM路由依据节点的通信环境以及邻居节点的分布情况,将节点通信区域划分为三个子区域。每个节点包含一个邻居表,并将邻居节点划分为三个子区域。同时DSR只允许部分节点传输RREQ包。仿真结果表明,提出的ZRDM路由降低了开销,提高了数据包传递率。在节点数为140时,相比DSR,ZRDM路由的归一化开销下降了约47.8%,数据包传递率提高约2.78%。

Aiming at the problem of high routing overhead caused by flooding Route Request(RREQ),Zone⁃based Route Discovery Mechanism(ZRDM)is proposed in this paper.According to the commun⁃ication environment of nodes and the distribution of neighboring nodes,ZRDM routing restricts the area of flooding RREQ.And the coverage area with transmission range is divided into sub⁃regions.Each node maintains a neighboring table and classifies the neighboring nodes into three sub⁃regions.In addition,ZRDM routing only allows some nodes to transmit RREQ packets.Simulation results show that the proposed ZRDM route reduces overhead and improves packet delivery rate.At 140 nodes,compared with DSR,ZRDM achieved a reduction of about 47.8%in term of normalized routing load,and achieved an enhancement of about 2.78%in term of packet delivery ratio.