Özet:

In this paper, a caching scheme was proposed to reduce the service waiting time in Video on Demand (VOD) system. Currently, most of the VOD systems are using several types of periodic broadcast which have been used to outperform the limitation bandwidth in wireless networks. In the matter of fact, the focus is based on solving the limitations of the Staggered Broadcast (SB) protocol, which are the video segments that are disseminated to mobile clients over a number of wireless channels. This in turn will lead to get a high service delay when mobile clients request the video. This delay is accursed when a client misses the broadcasting phase of the 1st segment from broadcasting channels. Therefore, this paper proposed a caching scheme which we denote as the Proxy Server Cache Mechanism (PSCM) to overcome the start-up service delay. In this scheme, the 1st segment of all broadcasting videos is stored on a stationary proxy server. The late clients can request the 1st segment directly from proxy server instead of waiting for the next broadcasting channel. Balancing technique is used to maintain the clients’ requests on the local proxy and ensure a fair distribution of these requests. The PSCM guarantee the mobile clients to obtain the 1st segment directly as soon as they arrive.

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