| The Wireless Mesh Network (WMN) is a new type of wireless communication network. WMN has features of self-organization and self-healing, as well as its capability of mobile user management and tracing. It is a multi-hop broad bandwidth distributing wireless network with high capacity and high transmission rate. Routing protocol is one of the key technologies in WMN, while routing metrics is an important parameter that influences the performance of routing protocol. The routing selection based on which metrics is the key issue of improving the performance of network. Therefore, the research of routing metrics is a hot spot in the area of routing protocol research all the way.Firstly, the dissertation describes the structure of wireless mesh network, then it studies and analyses the typical routing metrics, especially the expected throughput metric proposed recently. To the limitation of ETP, the interference range of link is taken into account, and a definition of node's loading is proposed at the same time, then the METPLB metric is proposed by incorporating them into ETP metric in this paper. Secondly, the process of route foundation of DSR protocol is modified and the routing metrics table is established by making use of the reserved bit of RREQ datagram, then the METPLB metric is applied in DSR protocol, the process of DSR protocol based on METPLB metric is described in detail, METPLB and ETP metrics are compared. Finally, the impact ofβvalue to network is studied through simulating experiment, the performance of ETP and METPLB is analyzed and compared. The experiment proves that: comparing with ETP, METPLB metric is preferable to choose the path which is more disjoint and the interference of link is smaller when running on the same channel as its routing path in mutil-radio and multi-channel wireless Mesh network with heavy traffic and loading, thus to improve the throughput and reduce the end-to-end delay as well as to achieve the loading balance of network effectively. |
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