A Collaborative Communication Eco-system Over Sustainable D2D Fog Cells In 5G

With the explosive growth of mobile devices and the higher requirements for transmission quality,traditional cellular technologies have become increasingly difficult to meet this challenges.Compared to 4G technology,5G technology has higher spectrum efficiency,higher energy efficiency and higher cost efficiency,and device-todevice(D2D)technology,as one of the core technologies of 5G,can meet some functional requirements of 5G,but it also brings challenges such as interference control,incentive mechanism,and energy consumption.This paper proposes a 5G collaborative communication ecosystem that uses RFcapable fog devices(FDs)as the relay to improve the spectral efficiency and energy efficiency of the communication system.In order to measure the labor of FDs and improve the performance of the system,the following contributions have been made.First,we modeled the utility of the base station(BS)and FDs to measure their respective labor,and used Stackelberg Game to find the Nash equilibrium encourage D2 D cooperative communication and proved the existence and uniqueness of the equilibrium.Second,FDs capable of RF energy collection is used,and a time allocation protocol is designed to restrict the working mode.Third,in order to reduce the redundancy of data transmitted by the relay and ensure an effective transmission rate,we have implemented the network coding data streams in the Galois Domain.We observed the unfair resource allocation phenomenon during FDs,in the process of the BS selection of relays,a fairness factor was added as an additional reference scheme,and a genetic algorithm was used to solve this double-objective optimization model.Fourth,considering the scenario of multiple register users(RUs)and FDs,the coalition formation game and the Stacelberg game are used to solve the spectrum division alliance and relay selection problems.The algorithm increases the total link capacity of the system on the premise of ensuring the service quality of RUs.The simulation results in Mininet show that the BS and FDs in games can get desirable utilities as well as fairness among FDs.The proposed coalition formation game can improve the total link capacity of the system and has advantages in algorithm performance.