Energy efficiency in wireless cooperative caching networks

Storing the popular contents in the caches to enable frequency reuse, wireless cooperative caching approach offers an exciting new way to unleash the ultimate potential of wireless networks. In this paper, we formulate the optimal caching problem to minimize the energy consumption in the wireless cooperative caching network by considering some important constraints, including the limited storage capacity, the content popularity and the content access protocol. A sub-optimal caching strategy is then proposed to handle the optimal content placement in the caches, reducing the energy consumption. Simulation results show that the proposed sub-optimal caching scheme has significant energy saving compared with the random caching scheme. Furthermore, the impact of the network resource and parameters on the system performance is also investigated in terms of the energy saving and the cache hit rate.