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IP Multimedia Subsystem

About: IP Multimedia Subsystem is a research topic. Over the lifetime, 4398 publications have been published within this topic receiving 43698 citations.


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Patent
24 Jan 2008
TL;DR: In this paper, the authors present a network-based device, method and computer-readable medium for operating a network device in an IP multimedia subsystem, which includes receiving an instruction for a de-registration action for a public user ID (PUID) registered at a device in the IMS, the instruction being initiated remotely from a device different from the device to which the deregistration applies.
Abstract: Disclosed are a network-based device, method and computer-readable medium for operating a network device in an IP multimedia subsystem. The method embodiment includes receiving an instruction for a de-registration action for a Public User ID (PUID) registered at a device in the IMS, the instruction being initiated remotely from a device different from the device to which the de-registration applies and performing the de-registration action wherein the PUID is de-registered from the device in the IMS network.

11 citations

Patent
17 Apr 2012
TL;DR: In this article, the authors propose a method of handling the failure of a Service Centralization and Continuity Application Server (SCC-AS) within an IP Multimedia Subsystem (IMS) network implementing a Single Radio Voice Call Continuity function.
Abstract: A method of handling the failure of a Service Centralization and Continuity Application Server (SCC-AS) within an IP Multimedia Subsystem (IMS) network implementing a Single Radio Voice Call Continuity function. The method comprises, following the failure of an SCC-AS for a given end user, replacing at an Access Transfer Control Function (ATCF) serving the user, a first Access Transfer Update Session Transfer Identification (ATU-STI) that identifies said SCC-AS, with a further ATU-STI that identifies a redundant SCC-AS. This allows the ATCF to subsequently notify the redundant SCC-AS of an access transfer request in respect of the user.

11 citations

Patent
15 Dec 2011
TL;DR: In this article, a service indication mechanism is described for use by IP Multimedia Subsystem, IMS, codes (201, 204) of an IMS network (106) in routing a terminating call in a network comprising a circuit switched, CS, network (107) and an IP network (105, 106).
Abstract: A service indication mechanism is described for use by IP Multimedia Subsystem, IMS, codes (201, 204) of an IMS network (106) in routing a terminating call in a network comprising a circuit switched, CS, network (107) and an IMS network (105, 106). On receipt of a Service Initiation Protocol, SIP, message from a second IMS node (202), the SIP message including a called user number associated with the call (A1), a SIP Uniform Resource Identifier, URI, and the call services for the called user from a user profile database is retrieved (A2). A second SIP URI is generated by including a service indicator of the called user in the received SIP URI, the service indicator representing the call services of the called user (A3), the SIP message is transmitted with the second SIP-URI to a third IMS node (204). On receiving the transmitted SIP message, the third IMS node (204) detects whether the service indicator is included in the SIP URI, and applies the service indicator to a plurality of policy rules for indicating whether the terminating call should be routed to the CS network (107) and whether to suppress insertion of a prefix to a CS routing number of the called user. The third IMS node (204) transmits to a CS node (206) a SIP message including the CS routing number without the prefix when a routing policy rule associated with the service indicator indicates suppression of the prefix (B5).

11 citations

Patent
08 Jan 2009
TL;DR: In this paper, a method of ensuring that a currently reachable contact address is registered for a user terminal within an IP Multimedia Subsystem, the method comprising registering a first contact address for said terminal with the IP multimedia sub-system, subsequently determining on a network side that said terminal is no longer reachable via said first contact addresses, and as a consequence of such a determination, registering on the network side a second reachability contact address on behalf of the user terminal, with the P2P system.
Abstract: A method of ensuring that a currently reachable contact address is registered for a user terminal within an IP Multimedia Subsystem, the method comprising registering a first contact address for said terminal with the IP Multimedia Subsystem, subsequently determining on a network side that said terminal is no longer reachable via said first contact address, and as a consequence of such a determination, registering on the network side a second reachable contact address on behalf of the user terminal, with the IP Multimedia Subsystem.

11 citations

Patent
Deoksoo Lim1
01 Oct 2010
TL;DR: In this article, a method and apparatus for generating a temporary Globally Routable User Agent URI (GRUU) in an IP Multimedia Subsystem (IMS) system is presented.
Abstract: There is provided a method and apparatus for generating a temporary Globally Routable User Agent URI (GRUU) in an IP Multimedia Subsystem (IMS) system The method and apparatus can generate a temporary GRUU without the need to generate and manage a separate database (DB) Since the previously registered user's aor and Instance Id cannot be found if a DB managing an I value I_i and an aor-Instance Id pair is lost, the method generates a temporary GRUU based on the current timestamp, an Address Of Record (aor) and an Instance Id (or Private User Identity)

11 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20235
202219
202124
202050
201971
201881