Research On D2D Resource Allocation Algorithm Based On Clusting

With the popularization of intelligent communication terminals and the rapid development of communication technology,limited spectrum resources are unable to match the growing demand of communication services.In order to meet people's demand for future wireless data services,D2 D communication technology has been introduced into cellular system as an auxiliary communication.With the breakthrough of self-interference cancellation technology,full-duplex technology can almostly double the spectrum rate,so research on the combination of full-duplex technology and D2 D communication has become a new hotspot.This thesis focuses on the study of resource allocation scheme for D2 D clusters in LTE-A system with full-duplex D2 D communication technology.In order to avoid the co-frequency interference between multiple D2 D users and one cellular user,enable as many D2 D users as possible to access to the system and maximize the system throughput,a full-duplex D2 D cluster resource allocation scheme based on the KM algorithm is proposed.Firstly,D2 D users are clustered by graph coloring method to make the interference among D2 D users in the same cluster acceptable.Secondly,Kuhn-Munkres algorithm is used to allocate D2 D clusters optimal cellular users' resources to reuse.Finally,for the sake of ensuring more D2 D users to reuse spectrum resources,D2 D clusters are reconstructed by calculating the signal to interference plus noise ratio(SINR)of cellular users which have been reused.The simulation results show that this scheme can effectively increase the access number of D2 D users and increase the throughput of system.In order to solve the problem that allocate resources to cellular users preferentially,D2 D users cause serious cumulative interference which destroy the accuracy of cellular scheduling,this thesis presents a resource allocation and power control scheme that allocates D2 D clusters' resource first.Firstly,calculating the signal noise ratios(SNR)of D2 D users on each resource block to obtain the D2 D clusters' initial allocation.Then,taking both intra-cluster interference and throughput into account and replanning the original clusters based on the interference graph.Nextly,according to the calculated weight matrix,allocating resources to cellular users.Finally,using a method of linear programming to control the D2 D users' power.The simulation results show that when there are more D2 D users using the same spectrum resource with one cellular user,the system throughput of the scheme that allocates resources to D2 D cluster first is better than the scheme that allocates resources to cellular users first.Controlling D2 D devices power in consideration of cellular users' quality of service can reduce the interference D2 D users cause to cellular users.Therefore,D2 D power control can improve the throughput of cellular users,and then improve the throughput of the system.