Resource Allocation Technology In Cache-enabled D2D Networks

In today's society,with the increasing popularity of intelligent devices and the rapid rise of the Internet of Things(IOT),people's life have undergone many tremendous changes.On the contrary,these new technologies also bring great pressure on the future networks.These huge data put a higher requirement for the traditional cellular networks' s wireless resource,such as system capacity,bandwidth and spectrum,which bring a huge challenge to the optimal resource allocation of the traditional cellular networks.In order to solve the resource allocation problem of the huge pressure that data traffic bring on the communication system.Researchers use the cache technology and the D2D communication technology in the cached-enabled D2D networks.In the cache-enabled D2D networks,when a device requests video files,it first requests the corresponding files from the terminal device in the communication range instead of directly requesting from the base station.If the requested files are cached by the surrounding terminal devices,the D2D communication link between the requested device and the transmit device is directly established for data transmission.Compared with the traditional cellular communication,the D2D transmission mode has remarkable Advantages.It can reduce the pressure of the system,reduce the delay caused by signal transmission,and effectively enhance the user experience to a large extent.Therefore,in order to improve the quality of users and achieve a better wireless resource allocation.In the cache-enabled D2D networks,we need improve the successful probability of the D2D communication.That is,we should study the optimal cache strategy for the video files,and the problem of allocating D2D link resources for the optimal scheduling.This paper mainly focuses on the following problems in the cache-enabled D2D networks:Firstly,for the existing work at home and abroad,we have conducted a survey and summarized.Secondly,aiming at the cache phase,with the transmit energy constraints,the optimal cache strategy based on outage probability is studied.In order to maximize the offloading probability of the system,the optimal caching strategy is modeled.The gradient descent method is used to solve the problem and the performance analysis is given.Finally,for the transmission phase,the scheduling algorithm in the cache-enabled D2D networks is studied.With the constraint of the quality of users,the optimization objective is to maximize the system throughput,and the corresponding algorithm is given.The simulation results show that the proposed algorithm has better performance than the traditional algorithms in terms of the system throughput.