Abstract
To alleviate the pressure brought by the explosion of mobile video traffic on present cellular networks, small cell base stations (SBS) with caching ability are introduced. In this paper, we consider the caching strategy using network coding for mobile users over heterogeneous wireless network containing SBSs. We formulate an integer programming problem to minimize the average number of packets downloaded from SBSs under the constraint of cache capacity, and prove that finding the optimal coded caching placement for mobile users is NPHard. Heuristic solution is proposed which reveals the structural properties of cache allocation based on their popularity profiles and user mobility patterns. Simulation results demonstrate that our proposed caching strategies acquire significant performance gain compared with conventional caching policies.
Published Version
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