Research On Interference Coordination Algorithm For D2D Communication

Device-to-Device(D2D),as one of the key technologies of 5G,allows direct communication between adjacent terminals to achieve higher data rate,lower communication delay and alleviates the shortage of spectrum resources.This thesis discusses and analyses the interference problem caused by the introduction of D2 D into the cellular network,focuses on the interference coordination technology of D2 D,and effectively coordinates the interference and suppresses the interference to a tolerable level by making a reasonable D2 D interference coordination scheme,including resource allocation and power control strategy.The main contents are as follows:Firstly,the matching order of KM algorithm is optimized,and the optimized KM algorithm is used to solve the optimal resource allocation problem for D2 D users and cellular users when they reuse resource in a "one to one" way.In D2 D relay system,a D2 D relay node selection algorithm based on geographical location is studied,and the resource allocation of D2 D relay link is solved by using the optimized KM algorithm to coordinate problems that the interference between D2 D relay link and cellular link and D2 D relay link capacity mismatch.Simulation results show that the optimized KM resource allocation algorithm can improve the throughput of hybrid network and the acceptance rate of D2 D users.In order to improve the resource utilization rate and increase the universality of the algorithm,a resource allocation algorithm of joint power control and dynamic grouping is studied.By dynamically grouping to D2 D users,resources are allocated to D2 D users in the group that can maximize the total capacity of the system.This algorithm can realize a resource multiplexing method in which the same resource is allocated to multiple D2 D users and a D2 D user can use multiple resources at the same time.The simulation results show that the studied algorithm can improve the spectral efficiency,energy efficiency and the acceptance rate of D2 D users.At present,the algorithms for D2 D interference coordination are applicable only in certain scenes and specific conditions,and there is no complete set of D2 D interference coordination solutions that can be applied to practical engineering applications.In this thesis,a set of D2 D interference coordination scheme is designed based on the two interference coordination algorithms studied before.Firstly,the base station ranks thegrade of service of D2 D users in the cell,preferentially assigns exclusive resources to the D2 D users with high service priority,and then allocates resources to the remaining D2 D users that are not assigned to resources.This interference coordination scheme can be applied directly to single cell,which can simultaneously coordinate the interference between D2 D user and cellular user and the interference between different D2 D users.