Keon Hyo Baek, Yong Woon Park, Ki Dong Chung

The KIPS Transactions:PartB , Vol. 8, No. 3, pp. 261-268, Jun. 2001
10.3745/KIPSTB.2001.8.3.261,   PDF Download:

Abstract

The continuous media objects, due to large volume and real-time constraints in their delivery, are likely to consume much network bandwidth. Generally, proxy servers are used to hold the frequently requested objects so as to reduce network traffic for the central server but most of them are designed for text and image data ; they do not go in harmony with continuous media objects. Therefore, in this paper, to resolve this problem, we propose a stream service mechanism using patch-based proxy caching policy. With the proposed stream service mechanism, the service mode of a client depends on the amount of cached portion of the requested object. First, a client is serviced fully from the proxy server if the requested object is cached fully in it. Second, only the initial portion of the requested object is cached to hide the initial latency for succeeding streams accessing the same object if it is not cached at all. Third, if the requested object is cached partially, the un-cached part of the requested object is cached step by step as a function of time discrepancy among streams if more than two concurrent streams exist. In this case, the client is assigned two channels ; the one is to read the cached data from the proxy server and the other is to read and then load the remaining part, i.e., the un-cached portion of the requested object from the central server.

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