Research On Autonomous Routing Decision-Making Technology In Ad Hoc Networks

Ad hoc network,also known as self-organizing network,is a non-center,multi-hop wireless network.Because of its outstanding features of convenient networking and antidestruction,self-organizing networks are widely used in disaster rescue,military communications,and vehicle-mounted networks.Ad hoc network can be divided into MANET network,DTN network and IIN network according to the network connectivity.The applicable scenario of MANET routing protocol is usually a fully connected and relatively stable network environment.If the network topology changes drastically or is interrupted due to node movement or other factors,the MANET network performance will drop sharply.Both the DTN routing protocol and the INN routing protocol are used in network scenarios that are prone to interruption,but the difference is that the interruption time of the INN network is shorter than that of the DTN network.The mechanism will increase the node memory overhead and data latency.The actual wireless multi-hop network environment is mostly a scenario where three network characteristics coexist.If only a single routing protocol is used,the performance of the network cannot be fully utilized.Adaptive routing is switched to the matching protocol,and an intermittent interruption network routing protocol suitable for INN network is designed.Firstly,the working principle and characteristics of the OLSR routing protocol and the DTN routing protocol are introduced,and an adaptive routing switching protocol that works together with the two routing protocols is proposed.The adaptive routing switching protocol judges the current network environment type,and then switches to the matching routing mode.The routing switching strategy uses the Q-learning algorithm in reinforcement learning.The algorithm selects the number of neighbors,the degree of neighbor change and Estimated time for path recovery Three factors affect the handover strategy.When there is a reachable path from the source node to the destination node,switch to MANET routing;switch to intermittent interruption routing protocol when a short interruption occurs;switch to DTN routing protocol when a long interruption occurs.Secondly,an intermittent interruption network routing protocol is designed,which has the functions of data packet controlled buffering and path recovery and forwarding,and a method for setting the optimal data packet buffer time based on path recovery time prediction is proposed.The method constructs the routing on-off time sequence based on the node routing table information,inputs it into the LSTM algorithm and estimates the path recovery time,and then sets the estimated path recovery time as the data packet storage time.If the path is restored before the packet cache expires,it will be forwarded,and when there is no route,it will be discarded.Finally,using the linux system laptop with Wi Fi network card as the network node platform,the protocol software modules for adaptive switching routing and intermittent interruption of network routing are developed,and the experimental network performance test environment is built in combination with the channel emulator.Firstly,the performances of MANET routing protocol,intermittently interrupted network routing protocol and DTN routing protocol in fully connected network and interrupted network are compared,and the prediction accuracy of path recovery time module in intermittently interrupted network routing protocol is tested.In the hybrid network,the function and performance of the adaptive routing switching protocol are tested.The experimental results show that the adaptive routing switching protocol improves the data delivery rate compared with the MANET routing protocol,and reduces the network overhead compared with the DTN routing protocol.Therefore,the overall performance of the network can be improved.