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Cooperative Caching for Scalable Video Transmissions Over Heterogeneous Networks

We investigate a cooperative video caching problem in heterogeneous networks (HetNet). In cellular networks with limited backhaul capacity, by equipping the small-cell base stations (SBSs) with caches, more data can be offloaded. The backhaul data is reduced and user equipment (UE) can enjoy a low latency. We formulate the total transmission delay (TTD) minimization problem as a nonlinear integer programming. To solve the NP-hard problem, we relax the constraints and propose a greedy algorithm for a feasible solution. We prove that the greedy algorithm is asymptotically optimal. Simulation results demonstrate that the proposed cooperative caching algorithm can significantly reduce the TTD.