Social-aware Interference Coordination Algorithm For D2D Relay Communication

Mobile communication technologies have developed rapidly in recent years.4G network have been commercially available in the main countries of the whole world,and 5G deployment is also imminent.The wireless communication system is moving toward the direction of multi-network convergence,and it will combine a variety of access methods and communication technologies to solve the shortage of spectrum resources,enhance spectral efficiency and improve the communication capacity.D2D(Device-to-Device)technology is one of the hot communication technologies,which allows the nearest mobile device to transmit data directly in the cellular network.D2D communication technology can provide more flexible network access and communication services,which has many advantages such as high data transmission rate and low network overhead.Meanwhile it allows reusing the spectrum resources of the cellular users,and thus greatly improves the efficiency of spectrum,alleviate the shortage of spectrum resources,and increase the throughput of the communication system.At present,D2 D communication research exists questions as follows:(1)the research scene is simple,mainly focused on the most basic D2 D single-hop communication and single D2 D user pair reusing single cellular user's spectrum,which is inconsistent with the actual application and demand;(2)the selection of relay nodes ignores the security of the nodes and the willingness of the nodes to involve in the relay.In this way,it is difficult to guarantee the link security and connection success rate;(3)most of the interference coordination algorithm focus on some respect in the mode selection,resource allocation,and power control.In order to get better results,multiple aspects should be combined and realize joint cooperation.Aiming at the problems existing in the current research,this paper proposes a social-aware interference coordination algorithm for D2 D relay communication.The algorithm has the following innovations and advantages:(1)converting the relay technology over the D2 D communication infrastructure,integrating one or more D2 D pair to reuse the same cellular user's spectrum,and using the grouping strategy for resource allocation,which can further improve the spectrum efficiency,increase the system capacity and throughput;(2)using the key characteristics of social relationships to select the relay nodes,which can significantly improve the communication security,increase the success rate of the connection,and reduce the cost of relay detection;(3)combining relay selection,resource allocation and power control and other aspects of collaboration to coordinate interference,which effectively improve the user SINR and system throughput.Seeing that D2 D is a new technology,and the simulation platform is not yet mature,this paper developed a D2 D communication simulation system based on LTE-A using Matlab Software,and used it in the simulation of the algorithm proposed in this paper.The results show that this algorithm has higher security performance and connection success rate,as well as obvious advantages in improving the user's SINR and total system throughput compared with the traditional algorithm.