Method and apparatus for centralized multipoint conferencing in

Details Method and apparatus for centralized multipoint conferencing in Method and apparatus for centralized multipoint conferencing in

1996-09-18

1999-10-05

Hsu, Alpus H.

Multiplex communications

Special services

Conferencing

370390, 348 15, H04L 1216

Patent

active

059635479

ABSTRACT:
A centralized multipoint conferencing arrangement uses a combination of multicast and unicast transmissions that is bandwidth efficient. A method of conferencing includes transmitting multimedia streams from endpoint terminals to a central resource such as a multipoint control unit (MCU) using unicast transmission. The multimedia streams are processed in the MCU and transmitted back to the endpoint terminals using multicast transmission. In addition, the MCU transmits other multimedia streams to selected endpoint terminals using unicast transmission. At the selected endpoint terminals, processing of the multimedia streams is inhibited in favor of processing the other multimedia streams.

REFERENCES:
patent: 5473363 (1995-12-01), Ng et al.
patent: 5600646 (1997-02-01), Polomski
patent: 5608726 (1997-03-01), Virgile
patent: 5787084 (1998-07-01), Hoang et al.
"Line Transmission of Non-Telephone Signals--Visual Telephone Systems and Equipment for Local Area Networks Which Provide a Non-Guaranteed Quality of Service," Draft ITU-T Recommendation H.323, pp. i-v, 1-75, (Jan. 30, 1996).

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