Minimum Delay Guaranteed Cooperative Device-to-Device Caching in 5G Wireless Networks

In wireless networks, the technique of caching contents cooperatively in user equipments (UEs) and base stations (BSs) enables to improve the performance of data access. In this paper, we consider cluster based cooperative device-to device (D2D) caching enabled network and formulate the caching problem to minimize content retrieving delay. To achieve this, we develop a content caching and replacement scheme by considering the limited storage capacity of UEs, content popularity, and content access process in the network. As a result, our scheme has shown the minimal delay by caching popular contents on UEs and BS with delivering requested contents at smaller average request hops. Moreover, we evaluate our approach with other caching schemes based on parameters as the number of UEs joining the cluster, content popularity and the number of edge UE in a cluster. Simulation results show that the proposed caching scheme significantly outperforms the other schemes.