Multiplex communications – Data flow congestion prevention or control – Control of data admission to the network
Reexamination Certificate
2002-10-05
2009-02-10
Shah, Chirag G (Department: 2619)
Multiplex communications
Data flow congestion prevention or control
Control of data admission to the network
C370S232000, C370S233000
Reexamination Certificate
active
07489634
ABSTRACT:
The invention refers a method of regulating the traffic that may be used between a SIP User Agent (SIP-UA) and a SIP Proxy in high traffic load situations, like in a telephony-SIP inter-working senario where the MGC in the inter-working gateway is acting as a SIP-UA. Thus, a method to fit the traffic between these two nodes into some margins which suit both node capabilities. The method comprises two procedures. The first procedure proposes a mechanism for any of both nodes, so called requesting node, to indicate the opposite node to act upon its traffic towards the requesting node. The reference for such decision is the current traffic being received at the requesting node at that very same moment. Any further traffic regulation indication will be related to the corresponding traffic level at the moment every new indication is issued, not necessarily being related to the traffic level being handled as previous indications were sent. This first procedure is the basic flow control protection between both nodes. The second procedure adds some fine controls to the first procedure. It allows both nodes to explicitly exchange capability values that will be used from that point on as a reference for any indication to act upon the traffic among both nodes. So, this second procedure provides a more permanent reference for any successive traffic regulation indication. The first procedure allows both nodes to control the traffic between them without knowing anything about each other's capabilities.
REFERENCES:
patent: 0948168 (1999-10-01), None
patent: WO 9959299 (1999-11-01), None
M. Handley et al: “RFC 2543: SIP: Session Initiation Protocol” IETF—Request for Comments, Online! Mar. 1999, pp. 131-132, XP002199599.
Henning Schulzrinne: “Comparison of H.323 and SIP” Internet Homepage, Online! Nov. 30, 1998, xp002199600.
“H.245: Control Protocol for Multimedia communication (May 1999)” ′Online! May 1, 1999, International Telecommunications Union, Geneva, Switzerland XP002199601.
Hartmut Wigttig et al: “Network Layer Scaling: Congestion Control in Multimedia Communication with Heterogenous Networks and Receivers” Multimedia Transport and Teleservices Nov. 13-15, 1994, pp. 274-299, XP000585306 Berlin ISBN: 3-540-58759-4.
Cardeno Triano Manuel
Sanchez Cembellin Jose Antonio
Shah Chirag G
Telefonaktiebolaget L M Ericsson (Publ)
Thompson, Jr. Otis L
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