Research On Power Control Machanism Of D2D Communication Based On ARQ And Energy Harvesting

Device-to-device(D2D)communication is one of the key technologies for emergency scenario communication.However,due to the limited energy of D2 D equipment,it can not maintain the long-term and large-data transmission requirements,and the communication environment in emergency scenarios is extremely complicated,which seriously causes communication interruption.Therefore,it is urgent to solve the problem of low reliability of D2 D communication in emergency scenarios.Although the academic community has proposed a D2 D communication model based on Automatic Repeat re Quest(ARQ)and energy harvesting,this communication model can effectively alleviate the energy limitation of D2 D equipment and reduce the reliability of communication in emergency scenarios.However,there are also some major problems: 1)In the ARQ mechanism,only the loss of data packet transmission is considered,and the loss of ACKnowledgement(ACK)is not considered.2)During the retransmission process,the impact of ACK on retransmission energy consumption is not fully analyzed.3)In emergency scenario communication,in order to extend battery life,the relationship between energy acquisition,data packet and ACK consumption energy needs to be considered jointly.Therefore,this article fully considers the above issues,based on single-hop D2 D communication and multi-hop D2 D communication as an extension,and separately studies the reliability of communication in emergency scenarios.The main work is as follows:1.Establishing reasonable communication models for single-hop D2 D communication and multi-hop D2 D communication in emergency scenarios.The communication failure probability is used to indicate the communication reliability.Based on the constraint that the acquired energy is not less than the consumed energy,the failure probability of receiving packets and ACK is analyzed first,and then the failure probability of single-hop D2 D communication and multi-hop D2 D communication are obtained respectively.The optimization problem of communication failure probability is defined under two models of fast and slow fading.2.For the optimization of communication in single-hop D2 D emergency scenarios,this thesis fully considers the energy consumption caused by ACK loss and retransmission,transforms the problem into a convex optimization problem,proposes iterative power control algorithms under different fading models,and finally analyzes the power control strategies in proposed models and other strategies through Monte Carlo simulation Communication failure probability gap.3.Aiming at the problem of communication optimization in multi-hop D2 D emergency scenarios,this thesis fully considers the energy consumption of sending ACK and packets by multi-hop D2 D relay equipment,analyzes the nature of the optimal strategies of the problem,and finally designs a time-slot based power control algorithm under different fading models.In summary,based on the ARQ mechanism and energy harvesting technology,this thesis studies the reliability of single-hop D2 D and multi-hop D2 D communication in the scenario and proposes corresponding strategies to ensure the reliability of multi-hop D2 D communication in the emergency scenario.Finally,Monte Carlo simulation results confirm the effectiveness of the strategies and the accuracy of the theory.