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A Patching-Based VOD System supporting VCR Operations  

조창식 (한국전자통신연구원 컴퓨터소프트웨어기술연구소)
마평수 (한국전자통신연구원 컴퓨터소프트웨어기술연구소)
이기호 (충북과학대학 컴퓨터정보학과)
강지훈 (충남대학교 정보통신공학부)
Publication Information
Journal of KIISE:Information Networking / v.30, no.1, 2003 , pp. 9-16 More about this Journal
Abstract
In this paper, we propose a method for supporting VCR operations in a patching based multicast VOD system. Random access, pause and resume operations are supported in our system, and the channel and session scheduling algorithms for the VCR operations are proposed. When it is necessary to join a sharable multicast channel in the admission control for the VCR operations, the patching technique, which shares an on-going regular channel and allocates a new patching channel for the missing data, is used. Therefore, unlike the previous approach that allocates an excessive number of I-channels, service latency is minimized and channel usage is optimized in our system. Moreover buffered data. which is saved in disk during patching, is reused to prevent unnecessary patching channel allocation. For this. the patching management information is extended and a buffed data management scheme is proposed. In our system, the First-Come-First-Served scheduling is used to inform clients the service latency for the VCR operations immediately.
Keywords
VCR; Multicasting; VOD system; Patching; Admission Control;
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