Research On Energy Efficiency Optimization Of D2D Communication Based On Power Control

With the rapid improvement of Internet of things and smart devices,the bandwidth and resource utilization efficiency of relevant networks need to be improved.At the same time,the corresponding energy consumption is becoming more and more serious.Faced with such a situation,D2 D communication link can be established between two adjacent terminal devices,which can share cellular link resources for direct communication without the assistance of base station,so as to make full use of communication resources and alleviate the problems of scarce spectrum resources and energy consumption.However,when D2 D users share link resources,cellular users and D2 D users will produce interference,which will reduce the performance of communication network.At the same time,due to the large increase of users and the limitation of battery capacity of terminal equipment,the problem of energy consumption is also highlighted.Therefore,this dissertation studies two scenarios of D2 D users reusing cellular link resources,which are mainly based on power control,under the premise of satisfying the service quality of D2 D users,aiming at eliminating the interference between communication users and improving the energy efficiency of D2 D,the energy efficiency optimization solutions are proposed for the two scenarios.The main achievements are as follows:(1)In the scenario of one-to-one energy efficiency optimization based on power control,D2 D communication technology is combined with full duplex transmission technology,it is assumed that a full duplex D2 D communication link can only reuse one cellular user link resource in this scenario,and a cellular user link resource can only be reused by one full duplex D2 D communication link,construct one-to-one full-duplex D2 D communication link.Then,under the condition of meeting the minimum rate requirement and power threshold of D2 D users,the power control and link resource allocation are modeled respectively,to improve the energy efficiency of full-duplex D2 D communication link.Finally,the optimal power control problem is solved by using the restricted region and sequence quadratic programming algorithm,the improved adaptive tabu search algorithm is used to solve the optimal link resource allocation problem,and the optimal energy efficiency allocation scheme is obtained.The simulation results show that,the algorithm has effective search operator and disturbance mechanism,and solve the energy efficiency optimization problem of full duplex D2 D communication link with low computational complexity.(2)In the scenario of many-to-one energy efficiency optimization based on power control,it is assumed that multiple D2 D communication links can simultaneously reuse a cellular user link resource.Aiming at many-to-one D2 D communication network scenario,a power control strategy based on cooperative game is proposed,D2 D users as players can dynamically adjust transmission power according to mutual interference.Firstly,under the constraint of interference threshold,aiming at maximizing the energy efficiency of D2 D network system,the D2 D user transmission rate is combined with the terminal battery energy,and the utility weight factor is introduced to construct the utility function of D2 D communication network.Then,the existence and uniqueness of Nash equilibrium solution of cooperative game model are proved,and select the appropriate utility weight factor.Finally,through repeated iterations of this algorithm,the optimal transmit power of D2 D users is obtained when the energy efficiency of D2 D communication network is maximum.The simulation results show that,compared with the existing algorithms,the proposed algorithm has faster convergence speed,can effectively suppress the interference between users,and achieve higher network utility.