Research On Multi-Path Routing Protocol For Wireless Mesh Network

Wireless Mesh Network(WMN)is a new kind of broadband wireless networks.Routing protocols play one of the most important parts in WMN, so the research on routing protocol is always a hot issue of WMN. The majority of on-demand routing protocols are based on a single path which is chosen according to certain indicators such as delay or hop-count.The link of single path may temporarily fail because of node mobility, node fails and dynamic characteristics of wireless channel. The overhead of searching alternative paths is high which may cause an additional delay and reduction of packet delivery ratio.The main advantage of multi-path routing is to provide high reliability and fault tolerance,so the paper focuses on multi-path routing protocol.The purpose of using multiple paths is to provide a more reliable and robust end to end connections or provide higher bandwidth to application layer. It will reduce the end to end delay and improve the packet delivery ratio and provide a better support for a variety of applications including real-time service.DSR is a typical on-demand routing protocol.Many multi-path routing protocols are based on DSR and SIMR is one of them.SIMR can find disjoint routes between source and destination.But its ability of finding disjoint routes is limited. The relevance of main path and alternative path affects the robustness of a routing protocol.After the study of DSR and SIMR, a new link-disjoint routing protocol LDSR and node-disjoint routing protocol NDSR which is based on DSR are given.The simulation results show that LDSR protocol can improve the packet delivery ratio and reduce end to end delay compared to SIMR in the sparse and fast motion network. NDSR protocol can improve the packet delivery ratio and reduce end to end delay compared to SIMR in the dense and fast motion network.