Television – Two-way video and voice communication – User positioning
Patent
1996-10-16
1999-10-12
Barry, Lance Leonard
Television
Two-way video and voice communication
User positioning
370439, 370440, 370442, 370430, H04J 1500
Patent
active
059661631
ABSTRACT:
In a two way cable system that includes a controller and a plurality of user terminals, a method of granting rights for upstream data transmission from the user terminals includes processing contention requests to generate contention grants and maintaining a list of connections, each connection having specified therefor a predetermined bit rate. The controller sends a downstream data stream to the user terminals and receives an upstream data stream from the user terminals. The downstream data stream includes a plurality of grant fields, and the upstream data stream includes upstream data slots and upstream control slots. The method further includes scheduling preemptive grants for upstream data slots using selected fields of the plurality of grant fields so as to provide preemptive grants for upstream data transport at a bit rate specified for each connection, sending to the user terminals a data transmission grant in a grant field of the plurality of grant fields for which a preemptive grant is scheduled, and sending to the user terminals a data transmission grant in a grant field of the plurality of grant fields in which a contention grant is pending and no preemptive grant is scheduled.
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Koperda Francis R.
Lin Bouchung
Barnhardt III Hubert J.
Barry Lance Leonard
Gardner Kelly A.
Massaroni Kenneth M.
Scientific-Atlanta, Inc.
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