Research On Resource Allocation And Interference Coordination In D2D Communication System

With the development of mobile Internet,the number of smart handheld devices and various mobile applications are growing exponentially.However,the contradiction between the limited bandwidth of mobile cellular technology and the rapid growth of users' demand for bandwidth is becoming more and more obvious.D2 D technology can provide data transmission support for short distance communication users by reusing wireless channels of mobile cellular users.Studies on D2 D related technologies generally focus on improving system throughput,while the complexity and implementability of algorithms are ignored.The objective of this study is that wireless resources is quickly allocated,the probability of communication system interruption is reduced and the interference status of D2 D communication terminals and base stations is reduced.In this paper,resource allocation and interference coordination algorithms in homogeneous and heterogeneous networks are studied respectively.The main research contents and achievements are as follows:(1)Firstly,D2 D communication environment and wireless signal propagation model are taken as the foundation in the homogeneous network.In order to reduce interference and improve resource allocation efficiency,the feasibility of introducing the idea of geographical location partition in D2 D resource allocation is discussed.This paper analyses the possible problems of resource allocation after introducing geographic location,and proposes a prototype scheme based on automatic adjustment and optimization of D2 D transmission power.A D2 D resource allocation algorithm based on geographic location partition is proposed.The simulation results show that the D2 D resource allocation algorithm based on location partition not only improves the speed of resource allocation,reduces the probability of system interruption,but also reduces the resource consumption of users.(2)Secondly,according to the current situation of mobile network in which macro-cell and small-cell coexist in real environment,the communication mode of D2 D communication in heterogeneous network is discussed.By introducing the load factor model and combining the location of D2 D users relative to small-cell,an interference coordination algorithm based on mode selection is proposed.The simulation results show that the coordination of interference coordination algorithm based on mode selection can effectively improve the spectrum utilization of the system.(3)Finally,the problem of relay node selection is analyzed when relay node forwarding is used to multiplex small cells for communication.In order to improve system throughput,the idea of geographic location partition is introduced.Considering the forwarding power provided by relay nodes when forwarding data,a Relay-assisted resource allocation algorithm is proposed.The simulation results show that the Relay-assisted resource allocation algorithm improves the system throughput on the basis of ensuring the efficiency of relay selection.