A Collaborative Hotspot Caching Design for 5G Cellular Network

The explosive growth of video data traffic brings a great pressure on the future 5G networks. Deploying caches at the radio access network and evolved packet core in the 5G network can effectively relieve this pressure by reducing duplicate content retransmission. In this paper, we propose a new collaborative cache scheme for the future 5G wireless network. The proposed scheme aims to improve the data availability and access rate locally easing collaborative local resources of the 5G wireless hotspot network. We investigate the impact of different constraints on the collaborative cache scheme, including limited storage capacity, placement of content, content popularity, and distribution of content. By considering these constraints, we effectively improve the overall performance of the 5G wireless network in terms of transmission delay, local availability of contents, and efficient utilization of caches within the network hotspot. Our proposed scheme provides an efficient utilization of the hotspot cache storage by using Zipf distribution and knapsack, and it is also able to entertain the user request partially available in the hotspot. Simulation results reveal that compared with conventional collaborative cache schemes, the proposed scheme for the 5G wireless network can significantly reduce transmission delay and increase hit-ratio within the hotspot.