A Community Tier Based Mobility Model Of Opportunistic Networks And Simulation

Opportunistic Networks is a branch of Ad hoc,which utilize communication opportunities from node movement.Opportunistic Networks arise provides a solution way for intermittent communication,for example,Wildlife monitoring,Vehicular networks and Challenged environments which is difficult to be set up in the laboratory.Therefore,the main way to research opportunistic network is to simulate real-world environment by simulate tools.Mobility model describes the node how to move,which is the major part of the simulation.And whether mobility model reflect the real-world,will affect the application of the research about opportunistic network.In this paper,several community discovery algorithms be study,then propose the concept of Community-Tier,and propose a Community-Tier based mobility model.The main work of this paper can be summarized as the following parts:Firstly,Details relevant knowledge of Opportunistic Networks will be introduced,mobility model and NS-3.Relevant knowledge of Opportunistic Networks include of the origin,concept and application.Mobility model,which will be two categories: Independent and identically distributed mobility model and Groups mobility model.Secondly,Current lack of community discovery algorithms will be analysis,and propose community stratification algorithm based on node Activity.Community will be partition two tier,one contain nodes that performance internally and externally are relatively active,one contain nodes which communicate with other nodes less frequently,the performance is relatively stable.Laboratory result proves the validity of this division by real data karate club.In the end,based on recent literature,a Community-Tier based mobility model be proposed.Social network is an important application of opportunistic network,so the node of network is human which move characteristics affected by community.Not only take into account the relationship between the community and the community's attractiveness which influenced node moves,in our model,but also for the first time put forward the internal structure of community impact for the selected node.Further,ns-3 be used to simulate our model,and analysis it by contrast with CMM(Classical Mobility model)?Infocom05(Moving track of participants),The simulation results show that the Mobility model proposed in this peper have higher compliance with the scene.