Research On MANET Routing Protocol Based On Network Coding

With the continuous development of network communication technology and the popularization of portable mobile devices,Mobile Ad Hoc Network(MANET)has gradually become a hot spot in the field of network communication.The nodes in the mobile ad hoc network are mobile,and the network topology changes dynamically.Data transmission in this kind of network is extremely susceptible to topology changes,and the network performance is therefore degraded.Network coding technology is different from the traditional store-andforward mode.The intermediate nodes encode and forward data packets,which can improve the throughput and reliability of network coding.In order to improve the performance of MANET network,this article redesigned the optimized link state routing protocol(OLSR)based on network coding,mainly from the following two aspects.(1)First of all,this paper proposes a new network coding-optimized link state routing(NCOLSR)protocol based on network coding.According to the characteristics of the MNAET network,the protocol redesigned the routing strategy and coding strategy,used the Multi-point Relay(MPR)mechanism and on-demand routing strategy to suppress the forwarding of network control packets,and defined the routing revenue function.Provide link quality assurance for network coding applications.For those nodes that have the coding conditions,NC-OLSR will perform hybrid coding on their data packets,and then perform coding packet forwarding according to the routing revenue function.(2)The routing and forwarding of encoded packets in NC-OLSR is often based on the routing revenue function.This method causes some coding opportunities on non-high-yield routing to be ignored,and the performance of network coding cannot be truly utilized..Based on NC-OLSR,this paper adopts a routing scheme based on coding opportunity awareness,and introduces an ant colony optimization algorithm into the routing strategy,and proposes a new and improved ant colony network coding-based optimization link state protocol(NCACO).By using the heuristic features of the ant colony algorithm,NCACO uses additional explorer ant colonies to search for global coding opportunities,and uses a special pheromone update mechanism to update the pheromone on links with high coding opportunities to induce Foraging ant colonies transmit on routes with high coding opportunities.At the same time,NCACO provides a solution to the pseudo-coding opportunities and the selection of coding packages that are prone to appear in network coding.In the end,this paper conducts a comparative performance analysis of OLSR,NC-OLSR,and NCACO three routing protocols through experimental simulations.The results verify the feasibility of network coding for the improvement of MANET performance,and the results show that NCACO with coding opportunity awareness is in network throughput Performance is even better in terms of volume and delay.