Research Of Topological Structure Characteristics Of MANETs Networks Based On Mobility Models

MANETs (Mobile Ad Hoc Networks, MANETs) is a kind of wireless ad hocnetworks that link mobile nodes, which is a multi-hop temporary autonomous system.Dynamic change of the network topology is very important for performance analysisof Mobile Ad hoc Networks (MANETs). Node mobility is one of the main causes ofthe dynamic network topology for MANETs, Therefore, it is of utmost importance tounderstand the impact of node mobility on topological properties in MANETs.In this paper, the impact of node mobility on MANETs network topology fromcomplexity, spatial-temporal, connectivity are researched:(1) The complexity of the MANETs network topology is studied using complexnetwork theory. Firstly, the complexity statistics characteristics are introduced.Secondly, we give the detailed analysis for the impact of mobility speed, signal radius,and node density on the degree distribution, clustering coefficient and mean minimalpath length of MANETs. The results show that MANETs do not meet small worldcharacteristics in most cases.(2) The Spatial and temporal topology characteristics of MANETs is studied. Theparameters of the spatial-temporal characteristics of the network topology areintroduced, which include relative speed, degree of temporal dependence and degreeof spatial dependence, etc. Based on RWP model, RPGM model and Gauss-Markovmodel, We analysis the impact of mobility speed, signal radius, and node density onthe spatial-temporal characteristics of MANETs using MobiSim simulator.(3) The connectivity of MANETs is studied. Link changes, link duration, pathavailable and other parameters are used to characterize the network connectivity.Simulation results show that mobile nodes lead to frequent changes in networktopology, and directly affect the connectivity of the network. The different modelparameters of mobility models will lead to different changes of network topology. Wealso find that the spatial-temporal characteristics including relative velocity, timecorrelation, spatial correlation and other parameters can distinguish different mobilemodels, but the results are slightly rough, while connectivity characteristics consisted of link change, link duration, and path available can measure the network topologychanges more detailed.