QoS Multi-path Routing in multi-radio multi-channel wireless mesh networks

With the wide use of multimedia applications, people improve the demand of high speed traffics increasingly. However, when the network is congested, single path route can not satisfy the end-to-end bandwidth requirement, thus limited bandwidth resources can not be used efficiently. In this paper, we therefore propose a bandwidth-guaranteed multi-path routing, which can find multiple node-disjoint paths between source and destination and perform the calculation of available bandwidth of found paths by introducing a method of calculating path available bandwidth. Meanwhile, we design a novel metric for path selection so that we select two parallel paths whose aggregated bandwidth can satisfy the connection bandwidth requirement from multiple paths found by the route discovery. Then we distribute data packets into the two parallel paths for concurrent transmission according to each path´s available bandwidth. Simulation results show our proposed Bandwidth-guaranteed Multi-path Routing (BMR) makes significant improvements in terms of the request success ratio compared with the related works.