Proxy Cache Admission and Replacement Policies for Layered Video Streaming

Abstract

In this paper, ”ubiquitous streaming” is defined as a scenario that streaming client is allowed to change the video streaming session (i) from A network to B network, e.g., from ADSL to 3.5G or from 3.5G to WLAN, and even (ii) from A device to B device, e.g., from a desktop to a smartphone, on the run time, i.e., the streaming session keeps continuity when the attached network and the device of streaming client are changed. In the 3-tier Server-Proxy-Client network architecture, the proxy can provide cached and relayed capabilities to reduce the workload of server and distribute streaming traffic. In order to satisfy with the characteristics of heterogeneous network and diversity of devices, the proxy should provide different qualities of media streaming using scalable video coding. To achieve adaptive network and device for ubiquitious streaming, proxy cache admission and replacement policies are designed with advances of scalable video coding for the 3-tier Server- Proxy-Client network architecture in this paper. The proposed layered cache admission and replacement policies can manage the proxy cache in consideration of the quality-of-service and the video popularity. In our experiments, we exhibit merits and performance results of the proposed cache admission and replacement mechanism.