Design Of D2D Communication System Under Multi-user Collaboration

With the development of communication technology,the number of mobile devices is increasing explosively,and new communication services are also emerging.As a revolutionary technology,5G technology has higher spectrum utilization efficiency and energy utilization efficiency,compared with other existing ones.Communication technology has huge advantages.As a key technology of 5G technology,device-to-device communication(D2D)can effectively improve the capacity and efficiency of 5G cells.However,it still has the issues of relay incentives,energy consumption,relay selection and coordination.This paper designs a sustainable relay incentive collaboration system under 5G.This system improves the service experience of the user equipment through the relay behavior of the fog device.At the same time,the fog device can use the bandwidth of the user device to increase its own throughput,so as to achieve the purpose of incentives and improve the spectrum utilization efficiency of the entire system;Energy harvesting technology is used to improve the energy efficiency of the entire system and effectively increase the working life of the fog equipment in this system.The main contributions are as follows:1.Aiming at the incentive problem in the D2 D communication system,a single relay model based on the Steinberg game is designed,which is used to motivate fog equipment to provide relay services,and to help improve the fog equipments' performance.Through wireless energy harvesting technology,improving the throughput and energy utilization efficiency of the entire system,finally proposed the optimal scheduling algorithm and embodied the communication protocol of the entire single-relay model.2.Aiming at the problem of frequent scheduling of a single relay based on the optimal benefit in the single-relay model,a multi-relay scheduling model based on the Chinese restaurant model is proposed,which uses the diversity of information received by fog equipment in different physical locations,and uses the network Coding technology which uses the computing power of the relay node to further improve the service experience of registered users,and allocate the remaining effective bandwidth to fog devices that provide relay services in the coalition through time division multiplexing,helping them increase throughput In order to achieve the purpose of motivation,the throughput and energy utilization efficiency of the whole system will be improved.3.Extend the single-relay model based on alliance formation in the original work to a multi-relay model,and compare it with the Chinese restaurant model to prove the advantages of the proposed model in the division of alliances.4.The performance of the proposed model is simulated through the Mininet-wifi simulation platform.The final simulation results show that the proposed model can effectively increase the efficiency of the entire system while achieving the purpose of excitation,and can further increase the efficiency of the entire system through wireless energy harvesting technology.The improvement of the working life of fog equipment in the cell proves the superiority of the proposed multi-relay dynamic matching model.