CA2245979A1 - Method and system for a unicast endpoint client to access a multicast internet protocol (ip) session - Google Patents

Method and system for a unicast endpoint client to access a multicast internet protocol (ip) session

Info

Publication number
CA2245979A1
CA2245979A1 CA002245979A CA2245979A CA2245979A1 CA 2245979 A1 CA2245979 A1 CA 2245979A1 CA 002245979 A CA002245979 A CA 002245979A CA 2245979 A CA2245979 A CA 2245979A CA 2245979 A1 CA2245979 A1 CA 2245979A1
Authority
CA
Canada
Prior art keywords
unicast
session
client
multicast
server
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002245979A
Other languages
French (fr)
Other versions
CA2245979C (en
Inventor
David Hilton Shur
Aleksandr Zelezniak
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
AT&T Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AT&T Corp filed Critical AT&T Corp
Publication of CA2245979A1 publication Critical patent/CA2245979A1/en
Application granted granted Critical
Publication of CA2245979C publication Critical patent/CA2245979C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/185—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with management of multicast group membership
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1836—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with heterogeneous network architecture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H04M3/567—Multimedia conference systems

Abstract

Unicast endpoint clients (110, 111, 115) on an IP Unicast network (107, 108) are provided access to Multicast sessions on an IP Multicast network (101) through a Multicast-Unicast gateway server (120, 121). The server obtains information about sessions on the Multicast network and makes such information available to a Unicast client on the Unicast network upon request bythe client. Upon being presented with a list describing the subject matter of each session, the user at the Unicast client selects the session to which he or she wants to join, which causes the Multicast-Unicast server to join the appropriate session on behalf of the requesting client for each media type in which the joining client wants to be a participant. The server then sets a bi-directional Unicast User Datagram Protocol (UDP) stream between itself and the client. All packets then received by the server from the Unicast client are address-translated to the appropriate Multicast session address. In addition, all packets received by the server on the Multicast session address are address-translated and sent to the Unicast client. The Unicast client is then able to participate in the Multicast session as both a sender and a receiver of packets to and from other Unicast and Multicast clients which are active during the session. Further, the Unicast client is capable of creating a new session, recording a session in the network for later retrieval and playback, and creating and accessing low bandwidth versions of existing sessions.
CA002245979A 1997-09-11 1998-08-26 Method and system for a unicast endpoint client to access a multicast internet protocol (ip) session Expired - Fee Related CA2245979C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/927,426 US6259701B1 (en) 1997-09-11 1997-09-11 Method and system for a unicast endpoint client to access a multicast internet protocol (IP) session
US08/927,426 1997-09-11

Publications (2)

Publication Number Publication Date
CA2245979A1 true CA2245979A1 (en) 1999-03-11
CA2245979C CA2245979C (en) 2003-04-22

Family

ID=25454704

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002245979A Expired - Fee Related CA2245979C (en) 1997-09-11 1998-08-26 Method and system for a unicast endpoint client to access a multicast internet protocol (ip) session

Country Status (5)

Country Link
US (1) US6259701B1 (en)
EP (1) EP0902569B1 (en)
CA (1) CA2245979C (en)
DE (1) DE69828230T2 (en)
HK (1) HK1020463A1 (en)

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