Abstract: How to improve the performance of the wireless Ad Hoc network by utilizing the spectrum resources efficiently based on multi-channel has become a hot research topic in recent years. In this paper, an On-Least Channel Handoff-DSDV (OLCH-DSDV) routing algorithm was proposed, which was based on the traditional DSDV protocol to reduce the channel handoff in the network. This algorithm used a channel allocation strategy with minimum channel handoff，so as to cut down the handoff delay. Thus it could reduce the average delay of the network while improving the system throughput. This routing algorithm requires the source node to select the best route with the minimum handoff channel according to the channel information maintained by itself.

Key words: Ad Hoc network, multi-channel, routing algorithm, Destination Sequenced Distance Vector (DSDV), handoff delay

摘要： 在Ad Hoc网络中，如何基于多信道有效地利用网络中的频谱资源，提高网络的性能，已经成为近几年来研究的热点。在DSDV路由协议的基础上，提出了一种基于减少网络中的信道切换的路由算法——OLCH-DSDV，该算法采用最小切换时延的信道分配策略，尽量减少信道切换产生的时延，从而降低了网络时延，提高了吞吐量。该算法要求源节点通过自身维护的路由和信道使用信息，选择到达目的节点的最优路径，也就是需要最少信道切换的路径。仿真结果表明该路由改进算法在有效提高系统吞吐量的同时，也有效地减少了网络中的传输时延。

关键词: Ad Hoc网络, 多信道, 路由算法, 目的序列距离矢量, 切换时延