| Compared to wired networks, wireless network, especially wireless mesh network, has its twocharacteristics including broadcasting and time-varying.And these features provide platform for theuse of network coding and opportunistic routing. In recent years, network coding awareopportunistic routing technology in the wireless mesh network has become a hot research topic,but there are two issues about existing network coding aware opportunistic routing technology:the first one, most studies have focused on selecting nodes to take participate in the encoding asmuch as possible opportunities;The second one, they mainly require more data packet andopportunities forwarding node without regard of the limited capacity of nodes in a real environmentIn response to these problems, this article mainly did the research work of the following threeaspects: firstly, it proposed the algorithm that is aim at optimizing routing and gived a new routingmetrics,known as link quality metrics LQM (Link Quality Metric), which considered codingopportunities, link quality and the congestion of the link into selecting a high quality nodes as aforwarding node.Simulation results show that this improved algorithm can improve the networkperformances; Second, it proposed a new algorithm based on code optimization by giving codinggain metric to dynamically determine whether a node having the encoding opportunities as well asby the value of coding opportunities of a data packet.These programes can limit the number ofpackets and forwarding the number of nodes so that reducing the complexity of coding. Thesimulation results show that this improved algorithm can improve network throughput and packetdelivery ratio. Third, it proposed a detection method by using the COPE protocol, this method takesinto account the actual characteristics of the network and finds the maximum flow rate of theencoding configuration, simulation results show that this method can increase the actual networkcoding opportunities and coding gain. |
PDF Full Text Request