Pace control for multicasting in a video server environment

Details Pace control for multicasting in a video server environment Pace control for multicasting in a video server environment

1995-09-12

1996-10-01

Nelms, David C.

Static information storage and retrieval

Addressing

Plural blocks or banks

365 49, 348 7, G11C 800, G11C 1500, H04N 710, G01R 3128

Patent

active

055616372

ABSTRACT:
A system and method for controlling transmission of a data stream by a server to a plurality of clients in a multicast group. In a first embodiment, one of the clients in a multicast group is designated as a leader. When a service request for transmission of a portion of the data stream is received by the server from any of the clients, the server determines if the service request was from the leader. Responsive to determining that the service request was from the leader, the server broadcasts the portion of the data stream to the clients in the multicast group. Otherwise the broadcasting is deferred. In another embodiment responsive to receipt of the service request for playout of a portion of a video (e.g. a block) from any of the clients in a multicast group, the server determines if a predetermined broadcast criteria has been satisfied. If so the server broadcasts the requested portion to all of the clients in the multicast group. Otherwise, the portion is not multicast to the group and the system is again checked against the broadcast criteria when another service request is received from any of the clients.

REFERENCES:
patent: 5453779 (1995-09-01), Dan et al.
K. Hwang et al. "A Preliminary Study of Push vs. Pull in Motion Video Servers", Second Workshop on High Performance Commnication Subsystems, HPCS'93, Williamsburg, VA, Sep. 1993.

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