Joint Power and Channel Allocation Based on Mobility and Interest Aware D2D Cache in HetNets

Device-to-device (D2D) communication has become a key technology to solve the outbreak of short video traffic in the network. There are many users with different interests in the Internet, and different users request diverse videos when they need them. At the same time, users are constantly moving, which will affect the distance of D2D communication. Therefore, the user's mobility and user's interests should be taken into account when designing the cache scheme. Based on user mobility and user interest, this paper formulates a problem of maximizing the energy spectral efficiency of joint user connection selection, bandwidth allocation and power allocation based on mobility and interest aware D2D cache in HetNets. This problem is a fractional form and not a convex problem, so it is hard to be solved directly. We decouple the problem into three subproblems, and transform the problem into a subtraction form by Dinkelbach algorithm. We propose an iterative algorithm to obtain the optimized result. Simulation results show that the algorithm proposed effectively improves the energy spectral efficiency of the network.