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Due to the explosive growth in multimedia traffic, the scalability ofvideo-on-demand (VoD) services becomes increasingly important. By exploitingthe potential cache ability at the client side, the performance of VoDmulticast delivery can be improved through video segment pre-caching. In thispaper, we address the performance limits of client caching enabled VoD schemesin wireless multicast networks with asynchronous requests. Both reactive andproactive systems are investigated. Specifically, for the reactive system wherevideos are transmitted on demand, we propose a joint cache allocation andmulticast delivery scheme to minimize the average bandwidth consumption underthe zero-delay constraint. For the proactive system where videos areperiodically broadcasted, a joint design of the cache-bandwidth allocationalgorithm and the delivery mechanism is developed to minimize the averagewaiting time under the total bandwidth constraint. In addition to the fullaccess pattern where clients view videos in their entirety, we further considerthe access patterns with random endpoints, fixed-size intervals and downloadingdemand, respectively. The impacts of different access patterns on theresource-allocation algorithm and the delivery mechanism are elaborated.Simulation results validate the accuracy of the analytical results and alsoprovide useful insights in designing VoD networks with client caching.

Design and Optimization of VoD schemes with Client Caching in Wireless Multicast Networks