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WO2008117165A2 - Enregistrement urgent dans un système de communication - Google Patents

Enregistrement urgent dans un système de communication Download PDF

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Publication number
WO2008117165A2
WO2008117165A2 PCT/IB2008/000712 IB2008000712W WO2008117165A2 WO 2008117165 A2 WO2008117165 A2 WO 2008117165A2 IB 2008000712 W IB2008000712 W IB 2008000712W WO 2008117165 A2 WO2008117165 A2 WO 2008117165A2
Authority
WO
WIPO (PCT)
Prior art keywords
registration
network
maximal
visited
visited network
Prior art date
Application number
PCT/IB2008/000712
Other languages
English (en)
Other versions
WO2008117165A3 (fr
Inventor
Jozsef Varga
Original Assignee
Nokia Corporation
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 Nokia Corporation filed Critical Nokia Corporation
Publication of WO2008117165A2 publication Critical patent/WO2008117165A2/fr
Publication of WO2008117165A3 publication Critical patent/WO2008117165A3/fr

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
    • H04L65/1073—Registration or de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections
    • 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
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06—Registration at serving network Location Register, VLR or user mobility server
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]

Definitions

  • the invention relates to an emergency registration in a communication system and a system and control entity for the same.
  • Capability to establish an emergency call or an emergency session is vital feature for users of telecommunication services. Users shall be able to establish an emergency session in practice always when their communication device is switched on, including the case when the Subscriber Identity Module (SIM) is not inserted in the communication device and also when roaming outside the home network of the user.
  • SIM Subscriber Identity Module
  • IP Internet Protocol
  • IMS Internet Multimedia Subsystem
  • 3GPP 3rd Generation Partnership Project
  • TS Technical Standards
  • SIP Session Initiation Protocol
  • SIP is an application-layer control protocol for creating, modifying, and terminating sessions with one or more participants. These sessions may include Internet multimedia conferences, Internet telephone calls, and multimedia distribution. Members in a session can communicate via multicast or via a mesh of unicast relations, or a combination of these.
  • UE user equipment
  • the IMS registration procedure shall follow the procedures as described in subclause 5.2.2.3 of 3GPP specification TS 23.228.
  • the registration procedure for emergency session follows the normal IMS registration with the following modifications.
  • the UE shall initiate an IMS emergency registration when the following conditions are met:
  • the UE is not already IMS registered or the UE is IMS registered but is roaming outside its home network; the UE has sufficient credentials to authenticate with the IMS network; the UE is able to detect emergency session.
  • the UE shall also initiate an IMS emergency registration when it receives an "IMS emergency registration required" response as a result of the emergency session request.
  • the UE shall use an emergency Public User Identifier in the emergency registration request. This indication may be used to route calls coming from the Public Safety Answering Point (PSAP) to the contact address registered during the emergency registration procedure and to inform the home network that roaming restrictions may not be applied. PSAP is a physical location, where emergency calls from the public are received. The user's home network should ignore any roaming restrictions for emergency registration requests.
  • PSAP Public Safety Answering Point
  • UE may indicate in a SIP REGISTER request how long the UE would like the registration to be valid.
  • the value is a number indicating seconds and is indicated in the "expires" parameter of the SIP protocol as defined in Internet Engineering Task Force (IETF) specification, Request for Comments (RFC) number 3261 "SIP: Session Initiation Protocol” in section 10.2 "Constructing the REGISTER Request”. If this parameter is not provided, the value of the Expires header field is used instead.
  • IETF Internet Engineering Task Force
  • RRC Request for Comments
  • a Proxy Call State Control Function shall handle the registration requests with an emergency Public User Identifier like any other registration requests except that handling of registration expiration. It has been suggested that P-CSCF may set the proposed registration expiration time according to the local policy and change the expiration value in the SIP REGISTER requests, and then forward the request to the user's home network, preferably via Border Control Function (BCF) or Interrogating Call State Control Function (I-CSCF). For example, when a user is roaming in a visited network, the local policy of the visited network may have a different value for maximal registration lifetime than the UE indicates in SIP REGISTER request.
  • Border Control Function BCF
  • I-CSCF Interrogating Call State Control Function
  • the Serving Call State Control Function (S-CSCF) in the home network of the user should obtain the proposed registration expiration value from the request and use the same registration expiration time.
  • the S-CSCF should return a response containing the same registration expiration to the UE.
  • the sub-sequent registration flows are like any other registration.
  • P-CSCF could indicate the valid registration expiration timer value of the visited network to the home network.
  • the present invention may at least partly alleviate the above problem by providing a method for emergency registration in a communication system, comprising receiving an emergency registration request associated with a user roaming in a visited network, the request comprising a registration expiration time, comparing, in the visited network, the registration expiration time with a maximal registration expiration value of the visited network, including the maximal registration expiration value of the visited network into a parameter identifying the visited network in the emergency registration request if the maximal registration expiration value of the visited network is less than the registration expiration time in the received emergency registration request, and forwarding the emergency registration request towards a home network of the user.
  • the present invention may also provide a method comprising receiving an emergency registration request in the home network of the user, determining in the home network whether the received emergency registration request comprises the maximal registration expiration value of a visited network in a parameter identifying the visited network, and if the maximal registration expiration value of the visited network is present, applying the maximal registration expiration value as a registration expiration time according to the policy of the home network is disclosed.
  • the method may further comprise accepting the maximal registration expiration value as the registration expiration time according to the policy of the home network of the user even if the value is less than preconf ⁇ gured minimum expiration time in the home network.
  • the emergency registration request may comprises a Session Initiation Protocol, (SIP), registration request and the parameter identifying the visited network may comprise a P-Visited- Network-ID header of SIP protocol.
  • SIP Session Initiation Protocol
  • a proxy control entity configured to receive an emergency registration request associated with a user roaming in a visited network, inserting a maximal registration expiration value of the visited network into a parameter identifying the visited network in the emergency registration request, and transit the emergency registration request towards a home network of the user/
  • the proxy control entity may be further configured to compare a registration expiration time received in the emergency registration request with the maximal registration expiration value of the visited network, and inserting the maximal registration expiration value of the visited network into the parameter identifying the visited network only if the maximal registration expiration value of the visited network is less than the registration expiration time in the received emergency registration request.
  • the proxy control entity may be a Proxy Call State Control Function (P-CSCF) of IP Multimedia Subsystem (IMS) and it may be configured to insert the maximal registration expiration value into a P-Visited- Network-ID header of SIP protocol.
  • P-CSCF Proxy Call State Control Function
  • IMS IP Multimedia Subsystem
  • a method for emergency registration in a communication system comprising receiving an emergency registration request associated with a user roaming in a visited network, including a maximal registration expiration value of the visited network into a parameter identifying the visited network in the emergency registration request, and forwarding the emergency registration request towards a home network of the user.
  • a serving control entity configured to receive an emergency registration request associated with a user roaming in a visited network determine whether the received emergency registration request comprises a maximal registration expiration value of the visited network in a parameter identifying the visited network, and if the maximal registration expiration value of the visited network is present, applying the maximal registration expiration value as a registration expiration time according to the policy of the home network
  • the serving control entity may further be configured to accept the maximal registration expiration value as the registration expiration time according to the policy of the home network of the user even if the value is less than preconfigured minimum expiration time in the home network.
  • the serving control entity may be configured to determine whether the received emergency registration request comprises the maximal registration expiration value of the visited network in a P- Visited-Network-ID header of SIP protocol.
  • the serving control entity comprises a Serving Call State Control Function (P-CSCF) of IP Multimedia Subsystem (IMS). It is also provided a communication system comprising a proxy control entity as described above and serving control entity as described above
  • Figure 1 illustrates a scenario where a user is roaming in a visited network.
  • Figure 2 shows an example of a signaling flow according an embodiment of the invention.
  • Figure 3 shows structure of an example of a proxy control entity capable of supporting embodiments of the invention.
  • Communication networks are composed of a collection of so called home networks, visited networks and subscribers.
  • a particular home network may have roaming agreements with one or more visited networks. This has the effect that when a mobile terminal is roaming, it can use resources provided by the visited network in a transparent fashion.
  • a home network One of the conditions for a home network to accept the registration of a UE roaming to a particular visited network, is the existence of a roaming agreement between the home network and the visited network.
  • UE typically, and in particular in 3GPP compatible networks, UE always register to the home network.
  • the REGISTER request is proxied by one or more proxies located in the visited network towards the home network.
  • the home network must know in which visited network the UE is located and therefore the visited network shall include an identification identifying the visited network and that indication must be known at the home network. This identification is globally unique, and preferably takes the form of a quoted text string or a token.
  • the home network may use this identification to verify the existence of a roaming agreement with the visited network, and to authorize the registration through that visited network.
  • P-Header Prior Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3rd- Generation Partnership Project (3GPP) " is defining in section 4.3 a SIP header called P-Visited-Network- ID header for the above purpose.
  • P- Visited-Network-ID header is applicable when one or more of the following circumstances are met:
  • An endpoint is using resources provided by one or more visited networks (a network to which the user does not have a direct business relationship).
  • a proxy that is located in one of the visited networks wants to be identified at the user's home network. - There is no requirement that every visited network needs to be identified at the home network. Those networks that want to be identified make use of the P-Visited-Network-ID header. Those networks that do not want to be identified may ignore use of P-Visited-
  • a commonly pre-agreed text string or token identifies the visited network at the home network.
  • - UE sends a REGISTER or dialog-initiating request (e.g., SIP INVITE) or a standalone request outside a dialog (e.g., SIP OPTIONS) to a proxy in a visited network.
  • a REGISTER or dialog-initiating request e.g., SIP INVITE
  • a standalone request outside a dialog e.g., SIP OPTIONS
  • the request traverses, en route to its destination, a first proxy located in the visited network, and a second proxy located in the home network or its destination is the registrar in the home network.
  • the registrar or home proxy verifies and authorizes the usage of resources (e.g., proxies) in the visited network.
  • resources e.g., proxies
  • the P-Visited-Network-ID header field is used by P-CSCF to convey to the registrar or home proxy in the home network the identifier of a visited network.
  • the identifier is a text string or token that is known by both the registrar or the home proxy at the home network and the proxies in the visited network.
  • a P-CSCF which is located in a visited network and that receives SIP REGISTER, INVITE or
  • OPTIONS request may insert a P-Visited-Network-ID header when it forwards the request.
  • a P-CSCF may insert a new P-Visited-Network-ID header if the request does not contain a P-
  • Visited-Network-ID header with the same network identifier as its own network identifier (e.g., if the request has traversed other different administrative domains).
  • the header is preferably populated with the contents of a text string or a token that identifies the administrative domain of the network where the P- CSCF is operating to the user's home network.
  • the registrar or proxy e.g. S-CSCF
  • the home network may take local policy driven actions based on the existence or not of a roaming agreement between the home and the indicated visited networks.
  • the P-Visited-Network-ID is normally used at registration. However, this does not preclude other usages. For instance, a P-CSCF located in a visited network that does not maintain registration state may insert a P-Visited-Network-ID header into any standalone request outside a dialog or a request that creates a dialog.
  • the syntax of the P-Visited-Network-ID header is described as follows:
  • UE must not insert a P-Visited-Network-ID header in any SIP message.
  • Figure 1 shows a roaming scenario where user equipment UE 2 is roaming in a visited network 1.
  • a proxying control element P-CSCF 3 in the visited network 1 is the first signaling contact point for roaming users, e.g. when the UE 2 initiates a registration procedure towards the home network 4 of the UE 2.
  • the P-CSCF 3 communicates with an interrogating control element I-CSCF 5 of the home network 4 of the UE 2.
  • the I-CSCF 5 communicates with serving control element S-CSCF 7 and Home Subscriber Server, HSS 6, according to standard IMS procedure.
  • Figure 2 presents an example of a signal flow according to an embodiment of the invention.
  • UE 2 sends a SIP REGISTER request message relating to an emergency call 1 1 to P-CSCF 3.
  • the registration request message may include "expires" parameter indicating how long the UE 2 would like the registration to be valid, e.g. value X presented as "Expires: X" in Fig 2 for SIP REGISTER 11.
  • P-CSCF 3 inserts an emergency registration timer value into a P-Visited-Network-ID header of the SIP REGISTER request 1 1 before forwarding the request towards the home network 4.
  • the P-CSCF 3 may include the emergency registration timer value according to the local policy of the visited network.
  • the local policy comprises rules for handling incoming SIP requests and sessions.
  • Local policy may be operator or service provider configurable.
  • the local policy may include maximal emergency registration timer allowed in the visited network.
  • the P-CSCF 3 may insert the emergency registration timer value into P-Visited-Network-ID header always or based on predetermined criteria.
  • the P-CSCF 3 may first compare the emergency registration timer value according to the local policy with the registration expiry time received in the SIP REGISTER 11 in the "expires" header, and insert the emergency registration timer value according to the local policy into the P-Visited-Network-ID header only if the value according to the local policy is shorter than the registration expires time in the received SIP REGISTER 11 from the UE 2.
  • the P-CSCF 3 then forwards the SIP REGISTER 12 to the S-CSCF 7 in the home network 4.
  • An I-CSCF 5 and other network elements e.g. BCF
  • the SIP REGISTER 12 includes the added P-Visited-Network-ID header which P-CSCF 3 added.
  • the P-Visited-Network-ID header comprises the identification of the visited network and the emergency registration timer value according the local policy of the visited network 1.
  • the visited-expires parameter of P-Visited-Network-ID header comprises value "Y" which may be shorter than the value "X" indicated by UE 2.
  • the S-CSCF 7 in the home network 4 may detect the emergency registration timer value in the received P-Visited-Network-ID header of the SIP REGISTER 12 and use this timer value instead of the registration expiration timer value provided by UE 2. In other words, if the maximal registration expiration value of the visited network is present, S-CSCF 7 may apply that maximal registration expiration value as a registration expiration time according to the policy of the home network.
  • the presence of maximal registration expiration value may prevent S-CSCF 7 from sending the SIP 423 error message ("Interval Too Brief) which is normally sent if the proposed expiration time is shorter than minimum expiration time accepted by the home network 4 or the S-CSCF 7.
  • the C-CSCF 7 may accept the maximal registration expiration value in the P-Visited- Network-ID header as the registration expiration time according to the policy of the home network even if the value is less than preconfigured minimum expiration time in the home network.
  • the S-CSCF 7 in the home network 4 may proceed using the registration expiration value provided by UE 2.
  • the above new parameter may be included in signaling by extending the P-Visited-Network-ID header as follows (example coding rules):
  • P-CSCF 3 is responsible for creating of P-Visited-Network-ID header into the SIP REGISTER 12 request for identifying the visited network to the home network; therefore it is practical to include also emergency registration timer value of the visited network 2 into this same header.
  • P-CSCF 3 is not allowed to change the content of most of the SIP headers received from the UE 2.
  • the P-CSCF 3 comprises the receiving module 31 for receiving SIP requests, e.g. SIP REGISTER messages.
  • the P-CSCF 3 comprises a policy module 32 for storing local policy rules, including e.g.
  • the P-CSCF 3 comprises inserting module 33 for inserting the emergency registration timer value from the policy module 32 into a SIP REGISTER to be forwarded.
  • the P-CSCF 3 comprises a transmitting module 34 for transmitting the SIP REGISTER to towards the home network.
  • the P-CSCF 3 may comprise a comparing module 35 for comparing the received registration timer value with the registration timer value obtained from the policy module 32.
  • the inserting module 33 may be configured to insert the emergency registration timer value from the policy module 32 into a SIP REGISTER only if the emergency registration timer value obtained by the comparing module 35 from the policy module 32 is less than the registration timer value received from the UE.
  • the invention is not limited to IMS networks, but also other networks supporting emergency sessions and similar proxy functionality in the visited network may use the invention. Therefore, the P- CSCF is only used here as an example of SIP proxy and other proxies may be capable of using embodiments of the present invention..
  • An example embodiment of the present invention may have the advantage that it may allow carrying registration expiration information of the visited network to the home network of the user without a need for P-CSCF of the visited network to change the content of the existing SIP headers in the SIP REGISTER request.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Management (AREA)
  • Environmental & Geological Engineering (AREA)
  • Public Health (AREA)
  • General Business, Economics & Management (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)

Abstract

L'invention concerne un procédé, un serveur mandataire, un serveur de contrôle de service ainsi qu'un système pour l'enregistrement urgent dans un système de communication. Ledit serveur mandataire reçoit une demande d'enregistrement urgent associée à un utilisateur qui navigue dans un réseau visité. Ce serveur mandataire insère une valeur maximale d'expiration d'enregistrement du réseau visité dans un paramètre qui identifie le réseau visité dans la demande d'enregistrement urgent, et envoie la demande d'enregistrement urgent vers un réseau domestique de l'utilisateur.
PCT/IB2008/000712 2007-03-28 2008-03-26 Enregistrement urgent dans un système de communication WO2008117165A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07006408 2007-03-28
EP07006408.4 2007-03-28

Publications (2)

Publication Number Publication Date
WO2008117165A2 true WO2008117165A2 (fr) 2008-10-02
WO2008117165A3 WO2008117165A3 (fr) 2009-08-13

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PCT/IB2008/000712 WO2008117165A2 (fr) 2007-03-28 2008-03-26 Enregistrement urgent dans un système de communication

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
WO2010127530A1 (fr) * 2009-05-08 2010-11-11 中兴通讯股份有限公司 Procédé et système d'établissement de service d'un sous-système multimédia par internet
CN101931901A (zh) * 2009-06-26 2010-12-29 中兴通讯股份有限公司 一种ip多媒体子系统网络的业务实现方法及系统
EP2372967A1 (fr) * 2008-12-22 2011-10-05 Huawei Technologies Co., Ltd. Procédé d'inscription, équipement proxy sortant et système de communication
WO2016155827A1 (fr) * 2015-04-01 2016-10-06 Telefonaktiebolaget L M Ericsson Appels d'urgence ims pour équipements utilisateurs (ue) itinérants

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US20030212912A1 (en) * 2002-05-07 2003-11-13 Gabor Bajko Method and communication system for controlling security association lifetime

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2372967A1 (fr) * 2008-12-22 2011-10-05 Huawei Technologies Co., Ltd. Procédé d'inscription, équipement proxy sortant et système de communication
EP2372967A4 (fr) * 2008-12-22 2012-09-26 Huawei Tech Co Ltd Procédé d'inscription, équipement proxy sortant et système de communication
WO2010127530A1 (fr) * 2009-05-08 2010-11-11 中兴通讯股份有限公司 Procédé et système d'établissement de service d'un sous-système multimédia par internet
CN101931901A (zh) * 2009-06-26 2010-12-29 中兴通讯股份有限公司 一种ip多媒体子系统网络的业务实现方法及系统
WO2016155827A1 (fr) * 2015-04-01 2016-10-06 Telefonaktiebolaget L M Ericsson Appels d'urgence ims pour équipements utilisateurs (ue) itinérants
US11032688B2 (en) 2015-04-01 2021-06-08 Telefonaktiebolaget Lm Ericsson (Publ) IMS emergency calls for roaming UEs
US11146939B2 (en) 2015-04-01 2021-10-12 Telefonaktiebolaget Lm Ericsson (Publ) IMS emergency calls for roaming UEs
US11743705B2 (en) 2015-04-01 2023-08-29 Telefonaktiebolaget Lm Ericsson (Publ) Internet protocol multimedia subsystem emergency calls for roaming user equipments
US11917516B2 (en) 2015-04-01 2024-02-27 Telefonaktiebolaget Lm Ericsson (Publ) Internet protocol multimedia subsystem emergency calls for roaming user equipments

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