Research On D2D Relay Selection Technology Based On Social Network And Price Incentive

With the rapid development of 5G technology,compared to 4G technology,it requires a wider signal coverage,faster transmission speeds,greater traffic density,and shorter transmission delays.It will bring new challenges to the future of mobile communications technology.While D2D(Device-to-Device)communication is a close-range device-to-device terminal direct connection communication.It is controlled by the base station but does not need to go through the base station to transmit data.Therefore,it has the advantages of multiplexing resources to improve spectrum utilization,direct communication to reduce transmission delay,and relay communication to expand the communication range.It has become one of the key technologies of 5G and has been widely studied by scholars.At present,D2 D communication research exists questions as follows:(1)Single research scenario,mostly researching D2 D single-hop communication;(2)For the selection of relay nodes,it is considered that the relay node is willing to join the relay communication and does not consider the issue of the willingness and stability of the relay node;(3)Directly ignored for strange nodes,did not encourage it to participate in relay communications.This article addresses these questions as follows:First of all,we analyze the research status of D2 D communication.There are many problem between node's trust and willingness in D2 D relay communication,then analyze the D2 D cooperative communication application scenario and the interference caused by the introduction of D2 D communication to the system.Secondly,we propose a D2 D relay selection algorithm based on mobile social networks in combination with social relationships.For idle nodes with strong social relations,they are willing to cooperate with the source node to solve the problem of the willingness of the relay node.According to the mobile location attribute,it is further determined whether the idle node is stable.Using social relationships and mobile location attributes to resolve the willingness and stability of idle nodes when selecting D2 D relays.So our proposed algorithm can effectively improve system throughput.Then,for nodes with weak social relationships or no social relationships.They take into account factors such as the security of their own information and equipment energy consumption,and are unwilling to participate in D2 D cooperative communications as relay nodes.To address this issue,we propose D2 D relay cooperative communication based on price incentives.Through the game between D2 D users,the optimal compensation price can be obtained.With this compensation price,each D2 D user can obtain more benefits and also ensure fairness among users.Finally,we study the interference caused by multiplexing cellular resources in D2 D relay communications,obtain better relay nodes to participate in cooperative communication through relay selection,and study the interference coordination of allocation of user packet resource and power control.It can effectively reduce the interference between users.