A Layered Cache Scheme for Internet Video Proxies

Abstract

Due to the improvement of the computer networks, it becomes more popular to stream video from the server to clients over Internet. To offer more convenient and exible services to more users, the proxybased service architecture should be adopted in video transmission over Internet. However, many control schemes, e.g., the cache scheme, that are currently adopted in the web proxy should be modied because of the characteristics of videos, such as the larger size and the real time concern. In this paper, we propose a layered cache scheme and a replacement scheme for video proxy, where clients can specify the quality of the requested video. To meet the QoS concern, delay factor is considered in our cache scheme to reduce the waiting time at the client side, and a corresponding cache scheme that does caching according to a media's deserved storage size is devised.