Saleh Ali Alomari
Faculty of Sciences and Information Technology, Jadara University, Irbid, Jordan
ABSTRACT
Video on Demand (VOD) system over the wireless mobile network is a system that provides video services
to mobile clients. The main problem with these systems is the high service delay where the mobile clients
have to wait to view their favorite movie. The importance of this paper is based on finding a solution on
how to reduce the delay time in the VOD system. This paper introduces a novel caching mechanism named
Proxy Server Cache mechanism to tackle the issue of service delay. This delay happens when the
broadcasting phase that is related to the first segment is missed by a client from the current broadcasting
channels. In this mechanism, the video’s first segment is stored on a server of a stationary proxy type. The
delayed clients will directly acquire the first segment from the proxy server instead of waiting for the
following broadcasting channel pertaining to the first segment. The proposed scheme ensuresobtaining the
first segment from mobile clients when they arrive. Additionally, the performance of the proposed scheme is
validated by applying the VOD system, which can involve the balancing mechanism to retain particular
requests through to the local proxy server to provide a fair dissemination for these requests. The obtained
result confirms that the proposed scheme reduces the time delay of the system in comparison with the best
existing schemes. The results of the average time delay in the Proxy-Cache scheme is 179.2505
milliseconds when 10 clients arrive each minute (Client/minute), the average time delay is 140 milliseconds
when the video lengths are 30, 60 and 90. Meanwhile, the failure probability for obtaining the first segment
of the video remains zero when the number of arrived requests is set to2, 4, 6, 8 and 10.
KEYWORDS
VOD, Proxy-Cache, All-Cache, PoR-Cache, Random-Cache, DSC-Cache, SB, LF’s, LPS.
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