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公开(公告)号：GB2317082A
公开(公告)日：1998-03-11
申请号：GB9718089
申请日：1997-08-28
Applicant: IBM
Inventor： LEUNG JOHN KALUNG , POON PETER , TONG FRED TZE-KEUNG
Abstract: Digitally encoded presentations (e.g. video on demand), are provided at the request and convenience of receivers 518 associated with a data distribution system 502, 500. The problem of reliably satisfying large numbers of randomly occurring receiver demands for digitally encoded presentations, particularly from a single storage copy of the presentation, and particularly for linear presentations, is addressed. A system is provided which includes a repository 503 of digitally encoded presentations, cache memory 510 for holding presentations which are being supplied to receivers, and a multicasting network for connecting the system to receivers. By grouping receivers into receiving groups for receiving multicasts of presentation segments, the system can satisfy the requests of any number of individual receivers, irrespective of other receivers receiving the presentation. For linear presentations, presentation segments may be defined to be of equal duration, and receiving groups may automatically be provided with sequential segments of the presentation. The system is optimally capable of multicasting all segments of a linear presentation within a period equalling the predefined segment duration.
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公开(公告)号：GB2317082B
公开(公告)日：2001-04-18
申请号：GB9718089
申请日：1997-08-28
Applicant: IBM
Inventor： LEUNG JOHN KALUNG , POON PETER , TONG FRED TZE-KEUNG
Abstract: Digitally encoded presentations are provided at the request and convenience of receivers associated with a data distribution system. The problem of reliably satisfying large numbers of randomly occurring receiver demands for digitally encoded presentations, particularly from a single storage copy of the presentation, and particularly for linear presentations, is addressed. The invention may be embodied in a system which includes a repository of digitally encoded presentations, cache memory for holding presentations which are being supplied to receivers, and a multicasting network for connecting the system to receivers. By grouping receivers into receiving groups for receiving multicasts of presentation segments, the system can satisfy the requests of any number of individual receivers, irrespective of other receivers receiving the presentation. For linear presentation, presentation segments may be defined to be of equal duration, and receiving groups may automatically be provided with sequential segments of the presentation. The system will optimally be capable of multicasting all segments of a linear presentation within a period equalling the predefined segment duration.
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公开(公告)号：HK1009017A1
公开(公告)日：1999-05-21
申请号：HK98109780
申请日：1998-08-07
Applicant: IBM
Inventor： LEUNG JOHN KALUNG , POON PETER , TONG FRED TZE-KEUNG
Abstract: Digitally encoded presentations are provided at the request and convenience of receivers associated with a data distribution system. The problem of reliably satisfying large numbers of randomly occurring receiver demands for digitally encoded presentations, particularly from a single storage copy of the presentation, and particularly for linear presentations, is addressed. The invention may be embodied in a system which includes a repository of digitally encoded presentations, cache memory for holding presentations which are being supplied to receivers, and a multicasting network for connecting the system to receivers. By grouping receivers into receiving groups for receiving multicasts of presentation segments, the system can satisfy the requests of any number of individual receivers, irrespective of other receivers receiving the presentation. For linear presentation, presentation segments may be defined to be of equal duration, and receiving groups may automatically be provided with sequential segments of the presentation. The system will optimally be capable of multicasting all segments of a linear presentation within a period equalling the predefined segment duration.
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