Video Delivery in Heterogeneous Wireless Networks With Network Coding

In this letter, we consider heterogeneous wireless network with storage capable wireless access points, and study the video delivery problem for video files that can be encoded with different layers in various qualities. We introduce a framework for the joint optimization of video file coding, cache content placement, and rate allocation for users with different quality requirements. We formulate the problem as a linear programming using network coding with non-overlapping windows and expanding windows, and the aim is to minimize the traffic load pressure on the base station. Simulation results show that significant caching and coding gains can be achieved with the proposed framework, which translates into a reduction of the extra traffic load on base station.