Research And Simulation Of Mobile Ad Hoc Network Survivability

Mobile ad hoc network(MANET)is a kind of non-central,self-organization,distributed wireless network without any fixed network equipment as the access point.The topology of the network changes with the moving of nodes,and each node in the network functions as both a host and a router.Mobile ad hoc network has great application prospects in many fields.However,the vulnerability of the network nodes and the security issues of the wireless channel put forward higher requirements and challenges for the design of mobile ad hoc networks.In order to guarantee the reliable application of mobile ad hoc network,a number of researchers have attached importance to the survivability study.One of the key issues in the research of network survivability is the critical node problems.In this paper,we use the centrality metrics in graph theory to find the critical nodes in the topology,and the movement of nodes in topology follows the Gauss-Markov mobility model and the random waypoint mobility model.Then,we use flow robustness to measure the topology connectivity,in order to show the relationship between the critical nodes in different metrics and the topology connectivity.In this paper,we also build a mobile ad hoc network simulation platform using the NS-3 network simulator.we use the packet delivery ratio to measure the mobile ad hoc network connectivity,to show the relationship between the critical nodes and the ad hoc network connectivity.It has some guiding significance for the design of mobile ad hoc networks and the improvement of network survivability.