Research On Network Coding Aware Routing In Wireless Mesh Network

ABSTRACT:Network coding has changed the information transmission way completely. Compared to wired networks, the broadcast nature of wireless network makes it more suitable to use network coding mechanism. The combination of network coding and broadcasting nature can improve the throughput of wireless network, and network coding in wireless network has become a hot-button issue for researchers.In wireless networks, the coverage of nodes'broadcast range has brought network coding opportunities, but increased the interference between nodes. While maximizing the opportunity to network coding to improve the network throughput, the interference is increased, as well as the additional I/O, CPU consumption and propagation delay of nodes. This paper contributed to the network coding and routing protocol in wireless mesh network with considering wireless network coding opportunities and the wireless network interference and focused on the following aspects:Firstly, the principle of the wireless network coding was analyzed and wireless network model was defined. To propose the interference and networking aware routing protocol, this paper compared and analyzed the advantages and disadvantages of traditional routing protocols and coding-aware routing protocol.Secondly, this paper analyzed the type of interference in wireless networks and modeled the interference. Based on the balance of the throughput improvement due to network coding and the time delay due to interference, it presented the Interference & Coding-Aware Routing (ICAR) metric, and routing protocol OICAR (On-demand Interference and Coding-Aware Routing) based on ICAR metric. Based on AODV protocol, this paper modified the routing packets format and the routing discovery progress.Finally, this paper designed and implemented the network coding module UniCOPE in NS2, then implemented the OICAR routing protocol. The simulation result of OICAR shows that:compared to AODV protocol, COPE and DCAR protocol, the OICAR protocol has a higher throughput and lower end-to-end time delay.