Method of distributing data packets of system software where the receiving units acknowledge only proper reception
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United States of America Patent
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-
Dec 28, 2004
Grant Date -
Nov 15, 2001
app pub date -
Sep 23, 1998
filing date -
Sep 23, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a point-to-multipoint system (SYS), particularly a video-on-demand system, comprising a send unit (SERVER) in the form of a server and a plurality of receive units (DEC) in the form of decoders, a new version of the system software for the decoders is to be transferred to the latter. This is done by taking the following steps: 1. An announce signal containing the information that the new system software or part thereof will subsequently be transferred is transmitted from the server to all decoders simultaneously. 2. The system software or part thereof is transferred in the form of data packets from the server to all decoders simultaneously. By the advance information in the form of an announce signal which is transmitted to all decoders by the broadcast method, the decoders are notified of the forthcoming transmission of the current version of the system software, whereupon they can prepare for the reception of the new version. The new version is also transmitted by the broadcast method, and ideally only once.
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