Research On Data Distribution Strategy And Typical Application Under MSCN Framework

In 2013,the concept of MEC(Mobile Edge Computing)emerged to migrate the computing platform from mobile core network to the edge of the mobile access network.The following definition,Multi-access Edge Computing,extends it applicable field from mobile cellular networks to other access networks.RSU(Roadside Unit),which serves as access point for connected vehicles,could support MEC based service,such as computing and storage,then provide real-time services for road vehicles.Then,service migration related problems of mobile communication,which this thesis focus,should be considered either.The details are as follows:Firstly,a new concept,MSCN(Mobile Secondary Computing Node),which performs by selected road vehicle nodes and provide computing and resource allocating function to surrounding vehicles,is defined.A MSCN based three-layer network framework and corresponding MSCN selection mechanism are proposed.Markov decision process is employed to analyze service migration problem of MSCN framework.After that,a MSCN-centered dynamic clustering method,which adjusts cluster coverage according to road vehicle density,is presented.Corresponding resource allocation scheme and BSM dissemination strategy are discussed.Then,two typical applications,which are intersection control and trajectory prediction,are selected to study RSU deployment method and data flow interaction progress under MSCN framework(The descriptions of the two applications are mainly used for framework validation and not for studying the applications themselves).At last,ns-3 network simulation platform is employed to simulate communication performance and application performance of MSCN framework.The experimental results show that the MSCN framework can improve corresponding parameters,such as BSM transmission rate,feedback rate,and the stability of the average backhaul delay.Moreover,the response delay under the MSCN framework is less affected by road vehicle density.The higher the road vehicle density is,the more obvious the benefit proposed framework should be.Meanwhile,the application response latency of MSCN framework with service migration in high-density scenarios is significantly lower than that of MSCN framework without service migration,and prove the validity of proposed methods.