Research And Realization Of COPE Network Coding Based On Multi-Channel Multi-Interface

Improving the utilization rate of bandwidth resources is the research focus of wireless mobile communication technology. Network coding is a novel technology proven to be able to dramatically improve the networks’ throughput, and the oppor- tunistic network coding method ( COPE ) proposed by S.Katti put network coding into real application under the test bed for the first time. Multi-channel multi-interface technology can both effectively utilize the bandwidth and create more network coding opportunities for COPE. Based on the above two points, the paper proposed a united transmission mode of multi-channel multi-interface and COPE network coding, so as to achieve the effective utilization of the existing spectrum resources.Based on the basic wireless network infrastructure provided by the NS2 network simulation platform, we implemented the multi-channel multi-interface model, and under the multi-channel multi-interface environment, we implemented COPE based on AODV routing protocol, thus forming the united transmission mode of multi-channel multi-interface and COPE network coding.In order to verify the united transmission mode’s being able to improve networks’ performance, we compared the sole AODV mode with AODV+MCMI mode, AODV+COPE mode, AODV+MCMI+COPE mode respectively in different topologies, using two indicators: network throughput and average delay.The simulation results showed that, in AODV+MCMI mode, multi-channel multi-interface could effectively improve the throughput and reduce the delay; In AODV+COPE mode, COPE would bring a throughput gain of about 47.83% while the network reached a steady state; In AODV+COPE+MCMI mode, the combination of multi-channel multi-interface and COPE generally can improve the network throughput, but with the network load increasing, the throughput performance would not be in line with the number of channels and interfaces.