Journal
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume 17, Issue 8, Pages 5270-5281Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2018.2840976
Keywords
Cooperative caching; device-to-device communication; 5G mobile communication
Funding
- Qualcomm Institute, University of California, San Diego, CA, USA
- National Science Foundation [CCF-1617365]
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Proactive caching will enable the 5G networks of the future to meet the challenge of continuously increasing wireless data traffic. Thanks to proactive caching, we are observing a shift from standard cellular networks, with one base station providing wireless connectivity to all the users in the cell, to heterogeneous networks, where several small base stations can assist the macro base station. Going one step further, users can also share their local content via device-to-device communications, avoiding multiple requests to the base station. In this complex network scenario, we propose a proactive caching policy to exploit all these communication opportunities and reduce congestion on the backhaul link, with the goal of minimizing the system cost, e.g., in terms of energy or bandwidth wastage. We provide a closed-form expression for the average system cost in the case of user mobility. In this scenario, we also consider heterogeneous file popularity profiles for different users. We present a robust optimization framework and show significant performance gains compared to a static caching policy, in which the caching decisions do not depend on the evolution of the network scenario.
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