多接口mesh网络下链路冗余模型的研究

Research on Link Redundancy Abstract Model for Multi-radio Mesh Network

为了提高无线mesh网络吞吐量问题,提出一种在多接口mesh网络中的链路冗余抽象模型.该模型将多个射频接口抽象成一个逻辑接口,使用OLSR路由协议在网络层建立连接的同时,邻节点之间在链路层自动建立一条数据链路,将不同类型的数据报分配到不同的链路上传输,降低频繁广播控制包而引起的数据包传输延迟,提高网络吞吐量;实现静态信道分配策略,提高信道利用率.最后,将链路冗余抽象模型与OLSR路由协议相结合,在每个节点装有双802.11b无线网卡的多接口多信道无线mesh网络实验床上测试性能,实验结果表明其能够有效的提高mesh网络的整体吞吐量和降低端到端的延迟.

In order to improve the throughput for wireless mesh network, this paper presents a link redundancy abstract model in Multi- radio Multi-channel mesh network. The model abstracts multi radios into a logical radio and establishes a connection in link layer while OLSR routing protocol establishing a connection in network layer. After that the model distributes different kinds of datagram into dif- ferent link to transfer,so it can reduce transmission delay of data packet cased by control packet broadcasting and improve the through- put. The static channel allocation strategy improves channel utilization. Finally,combine the link redundancy abstract model and OLSR routing protocol to test performance in Multi-radio Multi-channel test bed with dual 802. 11 b wireless network cards. The experiment result shows that the abstract model can effectively improve throughput and reduce end to end delay for mesh network.