Research On Resource Allocation Strategy For D2D Communication In Cellular Networks

With the continuous emergence of more and more intelligent communication terminals and the rapid development of communication technology,the demand related to short-range communication services is also rising.Faced with these increasingly high transmission rate requirements,while improving user service experience,it is also necessary to reduce operating costs.Device-to-Device（D2D）communication technology is classified as one of the pivotal technologies in cellular mobile communication.Device-to-device communication is a new communication mode that supports direct data transfer between users in close proximity.The advantage of introducing D2 D communication in a cellular network is to increase the capacity of the original cellular system,but on the other hand,it will bring additional interference to the base stations in the network and the original cellular users,especially when D2 D devices reuse cellular channel resources,which will affect the quality of service（Qo S）of the cellular device.The difficulty of D2 D communication technology depends on lessening the interference between the cellular system and the D2 D system,how to efficiently coordinate the communication resources to improve the spectral efficiency,system capacity and energy efficiency,which is also a heated discussion in the realm of wireless communication in the last few years.Therefore,this paper studies the resource allocation problem of D2 D communication in cellular networks,focusing on the resource allocation algorithm based on the bipartite graph in the scene of single cell,and the scheme of resource allocation based on Soft Frequency Reuse（SFR）in a multi-cell scenario.The specific research contents are as follows:（1）In the single-cell communication scenario,this paper proposes a resource allocation strategy based on a bipartite graph.In a single-cell scenario,the base station has complete channel information.Considering how D2 D users can reuse the resources of cellular users to connect to the network and enhance the system throughput in a fully loaded cellular network,a bipartite graph matching algorithm is proposed.Resource allocation scheme,this scheme first uses the matching algorithm in graph theory to ensure the overall minimum interference condition,and then establishes the priority and candidate set to achieve the purpose of reducing system interference and maximizing throughput.The simulation consequences indicate that the proposed strategy is able to efficiently improve the system capacity under the requirement of ensuring the quality of service.（2）In the multi-cell communication scenario,this paper proposes a resource allocation strategy based on SFR.Considering that in a multi-cell scenario,complex intra-and inter-area interference will occur when transmitting data between terminals,so the soft frequency reuse technology is used as the basis.On this basis,combined with the partial feedback mechanism,the cellular users with the best performance are selected to feed back partial link information,and then the heuristic algorithm mentioned above is used to allocate resources.This solution reduces a lot of signaling overhead while ensuring the communication quality of cellular users,effectively improving the overall performance of the system and improving the spectrum utilization.