Research On Wireless Mobile Multi-hop Network Routing Strategy

The wireless mobile multi-hop network is a network that has one or more intermediate nodes between the source node and the destination node and receives and forwards data packets through the wireless link.The network will appear as a result of changes in the density of nodes in the network.Network scenarios with different connectivity,such as dense network,sparse network,etc.Therefore,choosing a suitable routing protocol for different network scenarios has become a problem.This paper evaluates the usage scenarios and performance of the two types of protocols by simulating the typical routing protocols of two types of networks,MANET(Mobile Ad-hoc Networks)and DTN(Disruption Tolerant Networks).Then based on the simulation results,this paper designs an OLSR-SWF(Optimized Link State Routing-Store Wait Forward)routing protocol based on the "store-wait-forward" method,and implements the above protocol.First of all,the MANET routing protocol assumes that there is an end-to-end path from any source to any destination node most of the time,while the DTN routing protocol assumes that the network may never exist due to the high mobility of the node or because the node is frequently disconnected.End-to-end path.Therefore,MANET routing protocol and DTN routing protocol have obvious differences in their assumptions.If the routing protocol designed for the MANET network is applied to the DTN network,it will face the extreme situation that the receiving end cannot receive any data;the routing protocol designed for the DTN network is applied to the MANET network,even if the final destination node will receive the data packet,The transmission delay will also be very large.Therefore,through theoretical analysis and simulation results,this paper concludes that the DTN routing algorithm performs better in intermittently connected networks with lower density,and the MANET routing protocol is more suitable for denser networks.Then this paper designs a routing protocol based on OLSR(Optimized Link State Routing)routing protocol,and combines the core idea of DTN routing protocol "storeforward" routing protocol OLSR-SWF.In the OLSR routing protocol,if there is no path to the destination node of the data packet in the routing table of the current node,the OLSR routing protocol will directly discard the data packet,which causes the packet loss rate of the OLSR routing protocol in intermittently connected networks Very high.In response to this problem,the method adopted by the OLSR-SWF protocol proposed in this paper is to cache these data packets that were discarded due to path interruption or failure and try to deliver these data packets through the "store-wait-forward" method.To achieve the purpose of improving the packet delivery rate of the OLSR routing protocol in low-connectivity network scenarios,and the OLSR-SWF protocol can dynamically and transparently switch between the OLSR routing mechanism and the "store-wait-forward" mechanism.Finally,the functional verification of the OLSR-SWF routing protocol designed in this paper is compared with the performance of the traditional OLSR routing protocol.It is concluded that the OLSR-SWF routing protocol has better performance in a network scenario with intermittent connections and a wider range of applications.