A Caching-based Video-on-Demand Service in Wireless Relay Networks

In this work, we propose using video caching in the wireless relay networks (WRNs) for video on demand (VoD) service. We assume the relay station (RS) of the WRNs is capable of caching a small portion of the ongoing video stream. The cached video data can be used to accommodate new user requests. Previous works on video caching for VoD are in the context of overlay network, where the physical topology is a minor concern. However, in the WMNs, it is crucial for us to take the topology into consideration. Based on the topology, we could minimize the communication cost for a request to join a video multicast. In this way, efficient utilization of video caching in the targeted environment can be achieved. Simulation study verifies the efficiency of the proposed approach.