Research On The D2D Communication Peer Discovery And Resource Allocation Algorithm Based On The Social Characteristics

As an important technology in 5G communication system,D2 D communication technology can improve the spectrum utilization rate of the communication system,and reduce the load of the base station.At present,the user number of user equipment is growing rapidly,the spectrum resource is becoming increasingly tight,and the load pressure at the base station is also increasing.D2 D communication technology can ease the pressure of spectrum resource and base station.At the same time,D2 D communication technology as one kind of important communication technology in LTE-A is the technical basis of M2M(Machine to Machine),so it has great significance to study the technology of device-to-device(D2D).The process of D2 D communication is composed of four parts,which are peer discovery,mode selection,resource allocation and interference control.However,since the hand-held communication devices are carried by human beings who form social networks that exhibit certain stable social structures and characteristics.These structures and characteristics of the social network can be used to help solve the technical problems of device-to-device(D2D)communication,and to build a D2 D communication system based on social awareness.First,we present a peer discovery algorithm based on centrality.We evaluate the centrality of the user equipment according to the number of connections with other user equipment.According to the centrality,these user equipments are divided into several groups,and then the transmission frequency of the beacon signal is determined according to different groups.The user equipment in the group with higher centrality has a higher transmission frequency of beacon signal,the user equipment in the group with lower centrality has a lower transmission frequency of beacon signal.Simulation results show that the proposed algorithm can shorten the time and reduce the energy consumption of the peer discovery process.Then,a resource allocation algorithm based on the model of encounter is proposed.According to the encounter history of D2 D users,we predict the probability of D2 D communication that will happen between them.Then the priority of resource allocation is determined according to the probability of D2 D communication that will happen between them.Simulation results show that the proposed algorithm can improve the transmission rate of the whole communication system.Compared with previous researches,our work combines the social characteristics of the user and the related D2 D communication technology,improving the performance of D2 D communication system.