Resource Reuse Research For Full-duplex D2D Communication

With the continuous development of mobile communication systems,handheld intelligent terminal devices have been rapidly developed.The need for mobile broadband is growing.The wireless cellular network must have the characteristics of high speed,high capacity and high quality of service(QoS)in the future.Therefore,Device to Device(D2D)communication is proposed by the relevant scholars and introduced into the LTE-A network in order to improve the ability of system throughput,spectrum utilization and cell coverage.The existing D2 D resource reuse technology mainly aims at the half-duplex D2 D communication scene.In this paper,the resource allocation and power control scheme for the more complex full-duplex D2 D communication scenario are studied.Firstly,the research background and significance of this paper are introduced.Next,the evolution target and physical layer structure of LTE-A network are introduced.And then,the research status of D2 D communication is described and summarized at home and abroad,the full duplex communication technology and D2 D communication technology are briefly introduced at last.Secondly,according to the application of D2 D communication technology in LTE-A network,this thesis proposes an Inverse Order Resource Allocation(IORA)based on that one D2 D user can only reuse a cellular user's spectrum resource scheme.The algorithm ensures the QoS of cellular users,and the Signal to Interference plus Noise Ratio(SINR)of each D2 D user is under constraint conditions.The interference between cellular users and D2 D users are represented by bipartite graph according to graph theory.The priority to the minimum number of connections in bipartite graph of the D2 D users is given to allocate the spectrum resources,thus the throughput of the system is increased by using this method,and the algorithm complexity is lower than that of the comparative method.Thirdly,based on the fact that multiple D2 D users can share the same spectrum resource of one cellular user,this paper proposes a resource allocation algorithm based on graph coloring.In this scenario,the co-channel interference will occur between the D2 D user pairs.In order to limit the co-channel interference between the D2 D userswithin the acceptable range,the spectrum resource is allocated to the D2 D users by using the graph-based coloring algorithm in order to increase the system throughput.Finally,this paper studies the energy efficiency of D2 D equipment in view of the high demand for low power consumption and endurance when the devices in the social network share local resources,and a power control algorithm for full duplex D2 D communication is proposed.Under the premise of ensuring the quality of service of cellular users and D2 D users,the algorithm uses non-cooperative game method to optimize the transmission power of D2 D users,therefore the energy efficiency of the D2 D link is maximized.The simulation results show that this method improves the energy efficiency of D2 D link compared with half duplex D2 D link with power control and full-duplex D2 D with no power control.