Research On Resource Allocation Optimization Techniques For Cellular And D2D Heterogeneous Networks

With the increasing shortage of spectrum resources and the urgent need of people for high-speed data exchange,D2D communication technology has drawn more and more attention due to its own advantages.Cellular and D2D heterogeneous networking is an important means to solve the shortage of spectrum,reduce the load on the cellular network,enhance the throughput of the entire network,and reduce the system energy consumption.D2D communication alleviates spectrum shortage by reusing resources of cellular users.D2D communication,by virtue of its short-range direct communication,can save radio resources and can obtain considerable rate with less power,which is beneficial to interference control in heterogeneous networks.The optimal allocation of D2D communication resources in heterogeneous networks is the key to further expand the advantages of heterogeneous networks.This paper theoretically analyzes the advantages and disadvantages of reusing uplink and downlink resources in D2D communication and optimization of resource allocation algorithm has been studied.The main research contents and contributions are as follows:1.A base station charging and D2D terminal mutual charging mechanism is prosposed to solve two kinds of interference problems in heterogeneous networks.The introduction of the base station charging mechanism and the use of dichotomy for rapid dynamic adjustment to find the optimal base station charging price are used to control the interference of D2D users to cellular uplink users,and ensure the quality of service for cellular users.The introduction of terminal mutual charging mechanism is used to restrain the interferences between D2D terminals,a user-side game is designed to achieve the optimal reusing power to enhance the overall throughput.The simulation results verify the performance of the proposed algorithm.2.A multi-resource reusing algorithm is proposed by combining multi-channel power upper limit calculation based on waterfilling algorithm and optimal power calculation in power constrained case to solve the problem of power allocation when each D2D terminal reuse multiple resources.By designing an iterative waterfilling algorithm,each D2D terminal determines the power upper limit of each resource,and then performs the final power allocation by performing a power coordination algorithm between D2D terminals that reuse the same resources.Simulation results showthat multi-resource reusing algorithm has achieved considerable performance.