Research On Multipath Routing In Wireless Mesh Network

Wireless mesh network is a self-organizing, self-maintenance, self-configuring wireless network. This network brings many advantages, such as low cost, reliable service coverage and robustness, easy maintenance. With the rapid development of the wireless communication technology, the complexity and size of the wireless mesh network increases as well. The problem of network failure and date loss in the WMN operation affected the communication security and quality of communication. Using multipath routing can reduce these problems effectively.This thesis deduces an algorithm of No Relevant Multi-path Using Delay. The algorithm of multipath routing in AOMDV could ignore the optimal path in some cases. The algorithm of NRMUD can find the optimal path to meet the certain conditions. According to simulation, results show the superiority of NRMUD;This thesis defines a routing metric including link quality and node load. Multipath combined with load balance in order to ensure the destination node receives data effectively. Routing metric can decide link in the selection of routing way. In the process of routing discovery, introducing load detection can avoid overload node, balance the load quantity and optimize the link.Load-aware and reliable multipath routing protocol(LAOMDV) are proposed to address shortcomings of existing routing protocol(AOMDV), such as Load balancing shortcomings and defects about multipath delay path. According to the algorithm of MRMUD, the first it find one path with the smallest delay, the second start up the other routing discovery, using the node load detection, to avoid overload node, and calculate routing metric weights of the current node. The destination nodes start up route response. When the source node receives RREP, the source node will choose one to three paths for the channels of date transmission by routing metric weights and multipath.Using NS2 simulation software, This thesis design a criterion with load a aware, which has multi-path routing, and then increase broadband calculation function and node measurement function, update to the source code, debug, write Otcl script. From the results, LAOMDV routing protocol takes longer than AMODV protocol on the routing discovery, because it has computational complexity, but the cost belong to the same order of magnitude. LAOMDV has more reliability than AOMDV. The data delivery rate is significantly higher than AOMDV about 8% in the case of large date traffic. It has advantage on the performance of the other, such as end to end delays increasing about 10%.