SVC Video Delivery in Cache-Enabled Wireless HetNet

In heterogeneous cellular network (HetNet), costly transmissions from the macro base stations can be reduced by caching popular videos at small base station and user equipment. In this paper, we consider the joint transmission scheduling and rate allocation problem of scalable video coding streaming over cache-enabled wireless HetNet. We formulate the joint optimization problem to maximum system capacity with an mixed-integer linear programming, and prove that finding the optimal solution is NP-hard. Heuristic solution was proposed based on an iterative algorithm focusing on transmission scheduling decision and rate allocation, where transmission capacity is allocated flexibly and the quality of service of users is satisfied. Simulation results have shown that the proposed scheme can significantly improve the video-delivery performance for all users, in comparison with existing schemes.