Reasearch Of Resource Allocation In Device-to-Device Communications

Today,people have entered the mobile Internet Era with the development of communication technology,all kinds of emerging network services are gradually entering people’s vision.These services change people’s life gradually and bring a great convenience to people’s life,at the same time,the existing mobile networks are also under tremendous pressure.D2D communications,as a complement to LTE-A(Long Term Evolution-Advanced)technology,can be used to transmit the information directly in the current cellular network without having to pass the base station.It can reuse the spectrum resources in the network,so as to improve the resource utilization and throughput of the network and realize traffic offloading.So it is becoming a hot spot in the research of wireless communication.In this paper,we firstly analyze some problems and challenges brought by the development of the Internet,explain the background and significance of this research,and describe the main work done.Then,through the research and analysis of D2D communication technology,this paper summarizes the current research status of the technology,and focuses on the resource allocation technology in D2D communication,two resource allocation schemes are proposed.Firstly,for the concept of spatial reuse in wireless communication,this paper studies the related fields,and analyzes the scene of D2D communication in the cellular network,a D2D resource allocation scheme based on spatial reuse is proposed.The problem of resource allocation based on spatial reuse is described.The target is determined to maximize the overall throughput of cellular networks,and the communication quality is required to ensure that the SINR(signal to interference plus noise ratio)value of the received user is higher than the lowest threshold value.Then we propose a greedy based algorithm to solve this problem,and we can obtain the results of D2D communication resource allocation.The results of the simulation show that the scheme can improve the system throughput compared with the benchmark scheme.Secondly,the social relationship between the users can reflect the communication habits of users and the structure of the interaction between the crowd.Making full use of social information will play an important role in the research of wireless communication.In this paper,we first model the user’s social relationships,and present a scheme based on the user’s social model and physical parameters such as distance for D2D communication users clustering.After forming the clusters of D2D users,the D2D resource allocation scheme is designed.Based on the analysis of the interference among the users in the cellular network,in order to improve the system throughput and guarantee the quality of the user communication,two different resource reuse matching algorithms are proposed.Then the difference between the two methods is analyzed.Simulation results verify the effectiveness of the proposed cluster based resource allocation scheme.