Research Of Routing Protocol In Wireless Mesh Network Based On WPAN

The application of wireless personal area network(WPAN) is more and more widely. However, in order to meet the more needs of users, the data transfer rate and network coverage need to be further improved under the premise of guaranteeing QoS. Wireless mesh network is a high-speed and high-capacity distributed multi-hop network.The coverage of access points can be expanded in large-scale. The transmission rate and reliability of the system also can be improved. Thus, the construction of mesh applied to WPAN can solve some flaws in WPAN. So the research of wireless mesh network protocol based on WPAN is important for the application of wireless mesh network.As the view of application point, the type of network structure and technical merits in wireless mesh network were analyzed. The physical layer and media access control layer of IEEE802.15.4 protocol were mainly studied. The mesh sublayer was built on IEEE802.15.4 protocol. The questions of logical address assignment and the address overflow in network selfconfiguration were discussed. Subtree mesh adaptive routing algorithm was put forward against the question to improve the performance of the network.The construction of is the key to achieve wireless mesh network in WPAN. After a careful study of physical layer and media access control layer of the IEEE802.15.4 protocol, the mesh sublayer was constructed between MAC common part sublayer and the service specific convergence sublayer. According to superframe structure in PHY and MAC layer of IEEE802.15.4 protocol, the mesh superframe structure was designed. The adaptive block address allocation was introduced in address allocation of the mesh network. The process of mesh device joining or leaving the network was described.Routing protocol is the key to improve the performance in the network. The existing mesh routing protocol such as cluster tree algorithm,AODVjr and mesh adaptive tree routing protocol were analyed. The issues in address allocation and network coverage was proposed in WPAN mesh network in this paper. The network was divided into several logical subtree through the use of subtree. A new subtree mesh adaptive tree was constructed. At the same time, an improved hierarchical mesh adaptive tree routing algorithm was proposed to accommodate WPAN mesh network. Finally, the simulation of the algorithm was completed by NS2. The simulation results show that the introduction of WPAN mesh structure effectively avoid a single point of failure problem of the routing, and the algorithm expand the network coverage with not increasing the routing overhead and network load. It also effectively reduces the end-to-end delay, increases the packet delivery ratio and communication efficiency. It maintains a good performance in the networks of different size. It provides a theoretical basis for enhancing the coverage and reliability of WPAN.