Real-time multimedia conferencing over an ATM network using an intelligent ATM cable modem and hybrid fiber-coax access

• US 7,046,637 B2
• Filed: 06/14/2001
• Issued: 05/16/2006
• Est. Priority Date: 06/24/1997
• Status: Expired due to Fees

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Roy, Radhika R.
• Primary Examiner(s): Phunkulh, Bob A.
• Application Number:
  US09/880,027
• Publication Number:
  US 20020027596A1
• Time in Patent Office: 1,797 Days
• Field of Search: 370/260, 370/261, 370/262, 370/263, 370/264, 370/265, 370/395.1, 370/395.5, 370/395.53, 709/204, 709/205, 709/206, 709/207, 725/118, 725/129
• US Class Current: 370/260
• CPC Class Codes: H04L 12/2801 Broadband local area networks
• CPC Class Codes: H04L 2012/5605 Fibre
• CPC Class Codes: H04L 2012/5606 Metallic
• CPC Class Codes: H04L 2012/561 Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
• CPC Class Codes: H04L 2012/5638 Services, e.g. multimedia, GOS, QOS
• CPC Class Codes: H04L 2012/5642 Multicast/broadcast/point-multipoint, e.g. VOD
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A technique for providing real-time multimedia conferencing services with guaranteed performance, in a hybrid networking environment, by interconnecting cable modem-based premises networks via hybrid fiber coaxial (HFC) access networks and an ATM wide area network is disclosed. The ATM wide area network may be divided into a plurality of access network domains and one backbone network domain to provide efficient and intelligent multimedia conferencing services. Each ATM access network domain has one cable modem server as well as access multimedia bridge server. There is only one central network server and one central multimedia bridge server within the backbone network domain. Each cable modem server located in an ATM access network domain maintains necessary information of how the cable network bandwidth is used by existing calls, and will be allocated when new multimedia conference calls are initiated, in accordance with desired priority and performance levels.

Claims

1. The method of real-time multipoint, multimedia conference and collaborative services integrated with a hybrid fiber coaxial cable network including one or more cable modem servers and using ATM modems and an ATM wide area network using a central ATM server and one or more ATM access network domains and having a CM-ARQ control and signaling message of a CMsig scheme, comprising:

initializing the CM-ARQ control and signaling message;

determining if a call is received by the central ATM server or a cable modem server;

determining whether an addresses of all calling and called end points of a conference call reside in a same ATM access network domain;

sending details of a conference to a central ATM server from a cable modem server;

computing a bandwidth requirement algorithm for the HFC network; and

routing a calling party'"'"'s call to the central ATM server if an addresses of calling and called end points do not reside in a same ATM access network domain by relaying a CM-ARQ control and signaling message of a CMsig scheme.