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Failure recovery in an IP multimedia subsystem network

A multimedia subsystem and network technology, applied in transmission systems, electrical components, etc., can solve problems such as inability to guarantee

Active Publication Date: 2013-03-27
TELEFON AB LM ERICSSON (PUBL)
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  • Description
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Problems solved by technology

However the behavior is not guaranteed

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  • Failure recovery in an IP multimedia subsystem network
  • Failure recovery in an IP multimedia subsystem network
  • Failure recovery in an IP multimedia subsystem network

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[0034] It will be appreciated that existing mechanisms provide for recovery from S-CSCF failure during the registration process. It will also be appreciated that recovery from failure during a terminating call situation is already provided since the I-CSCF must be included within the SIP request path. In the following, the problem of recovering from S-CSCF failure during an originating call situation is addressed.

[0035] refer to image 3 Assuming that UE 1 has registered with the IMS network and has been assigned S-CSCF 2. In step 1, the UE sends a SIP request (eg SIP INVITE) to the IMS network. According to the standard IMS routing strategy, the request is firstly routed to the P-CSCF 3 . During the registration procedure, the P-CSCF will have been notified of the S-CSCF address to allow it to forward the request to the S-CSCF at that address. It is also assumed that, in the period between the registration and the sending of the SIP request, the S-CSCF has failed and i...

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Abstract

A method and apparatus for facilitating recovery from the failure of a Serving Call Session Control Function (S-CSCF) within an IP Multimedia Subsystem (IMS) network. A Proxy Call Session Control Function (P-CSCF) receives a SIP request sent by a User Equipment (UE) having an identity previously registered with the IMS network and for which a given S-CSCF was allocated. The P-CSCF determines whether the given S-CSCF has failed or is otherwise unreachable. If so, the P-CSCF sends a re-registration message to the UE. Receipt of the re-registration message at the UE forces the UE to perform an IMS registration procedure with the IMS network.

Description

technical field [0001] The present invention relates to failure recovery in an IP Multimedia Subsystem network, and in particular to a method and apparatus for enabling recovery from failure of a serving call session control function. Background technique [0002] IP multimedia services provide a dynamic combination of voice, video, messaging, data, etc. within the same session. By increasing the number of basic applications and media that are possible to combine, the number of services offered to end users will increase and the inter-personal communication experience will be enriched. This will lead to a new generation of personalized rich multimedia communication services, including so-called "combined IP multimedia" services. [0003] UMTS (Universal Mobile Telecommunications System) is a third generation wireless system designed to provide higher data rates and enhanced services to subscribers. UMTS is the successor to the Global System for Mobile Communications (GSM),...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06
CPCH04L29/06217H04L29/14H04L65/1016H04L69/40
Inventor H·普尔齐比茨M·C·贝林乔恩弗加拉T·福斯曼A·舒马彻尔
Owner TELEFON AB LM ERICSSON (PUBL)
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