CoMP based Cache Strategy Research in Cellular Heterogeneous Network

• 1、School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876

Abstract：The deploment of cellular heterogenous network can effectively meet the growing demand of mobile data, however, which brings heavy burden to the limited capacity backhaul link. Aiming at this problem, a promising solution is that small base station prospectively caches popular files and services local users. This paper studies CoMP based cache strategy to maximize the system utility. The optimization problem is described as a joint optimization problem of beamforming and cache control. By using variable separation, it is decomposed into two subproblems. Then exploiting the equivalent sum of WMSE minimization problem and the joint optimization algorithm based on genetic algorithm, two subproblems can be solved. Simulation results show that the proposed algorithm can effectively improve the utility of the system.

Keywords： cellular heterogeneous network CoMP cache beamforming