Research On D2D Content Sharing Based On Social Networks

With the popularization of intelligent terminals,the mobile Internet services are increasingly enriched,and the data transmission capacity of mobile terminals is also increasing.The traditional cellular networks face the challenges of lacking of spectrum resources and large burden of base station,which greatly limit the development of cellular networks.Device-to-Device Communication(D2D)is a kind of short-range wireless communication technology that can directly communicate between mobile terminals and has been introduced in traditional cellular networks,which can alleviate base station's(BS)burden,reduce energy consumption,and increases network transmission rate.In addition,users holding mobile terminals have a regular and relatively stable social networks model.Therefore,this paper introduces social networks into D2D communication,and organically combines them to study the content sharing problem in D2D communication scenarios.(1)The relay selection problem in the D2D communication scenario is studied.A social Aware and Energy-Buffer Assisted-based(S AEB A)relay selection strategy is proposed.Firstly,the relay selection policy considers interference between the cellular terminal and the D2D terminal,and each time the D2D terminal selects a cellular terminal that is capable of maximizing the transmission rate of the communication link as a resource reuse object.And then,the strategy considers social similarity between users,the remaining energy and storage space of the relay node,and the transmission rate of the link to calculate the weight of each link.Finally,the communication link with the highest weight will be selected for data transmission.The simulation results show that the strategy can effectively improve the overall transmission rate and the success probability of link communication.(2)The problem of multi-user collaborative file sharing in D2D communication is studied.A multi-user collaborative file sharing strategy is proposed,which introduces a Peer-to-Peer(P2P)transmission protocol into D2D communication.Firstly,the strategy analyzes a P2P file transfer protocol based on BitTorrent(BT)protocol and defines the seed(.torrent)file in this scenario.And then,a D2D multi-hop routing strategy is proposed based on the social similarity between users and the location of users.In the next,the terminals requesting to download the same data block are grouped based on the location of the terminals in the network,and the cluster head node of each group is determined.Finally,the request for the file data block is done by the head node of each group and the head node shares content within the group.The simulation results show that the strategy can effectively improve the overall transmission rate of the networks and reduce the route hops.