Research On Resource Allocation In D2D Communication

In recent years,with the rising popularity of smart mobile phone and mobile Internet,the traditional cellular network resources have been more scanty.In this context,D2 D communication technology can make the original communication system to get a greater rate and capacity.As a way to support the communication of the cellular network,D2 D communication has many advantages,such as reusing bandwidth resources can improve the efficiency of frequency band,and the short distance communication can effectively improve the communication rate.However,there are still some problems in D2 D communication,such as the interference,the mode selection and the energy efficiency.Therefore,this thesis will do some research on these issues.The main contributions of this thesis are as follows:1.In order to solve the problem of the allocation of bandwidth resources,this thesis finds out that the reverse iterative combinatorial auction is too complex to solve the problem.Therefore,this thesis proposes a centralized control mode of the combinatorial auction resource allocation.In this method,the base station is directly involved in the decision making of the competitive bidding resources,so as to reduce the complexity of the iterative algorithm.The theoretical analysis shows that the algorithm complexity of the centralized control algorithm is lower than that of the existing distributed algorithms.The simulation results show that the system rate of centralized control algorithm is consistent with that of the distributed algorithm.2.For the problem of mode selection,a large number of literatures show that the Hungarian algorithm can perfectly solve the problem of mode selection.However,the Hungarian algorithm has a relatively large defect,that is,the complexity of the Hungarian algorithm is relatively high.Therefore,this thesis proposes a heuristic mode selection scheme based on network state.In this scheme,the state of the network is divided into three states,such as low load,medium load and high load,and then the corresponding Hungarian algorithm is modified according to the three network states.At last,the simulation results show that the system rate of the improved Hungarian algorithm is better than that of the traditional cellular communication and is closed to the optimal mode selection algorithm.3.For the problem of energy efficiency,the thesis studies the problem of extending the battery lifetime of D2 D communication equipment on the premise of satisfying the D2 D communication rate.The Nash equilibrium and the Pareto optimal method have been used to deal with this problem.However,the algorithm does not consider the frequency resource allocation problem,so this thesis adds a frequency resource allocation algorithm based on auction mechanism to guarantee the overall system performance.The simulation results show that the joined resource allocation and energy efficiency optimization algorithm based on auction mechanism proposed in this thesis can obtain the battery lifetime and system rate colosed to the related work.