WO2001030101A1 - Mise a jour d'emplacement dans un environnement super charge - Google Patents

Mise a jour d'emplacement dans un environnement super charge Download PDF

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Publication number
WO2001030101A1
WO2001030101A1 PCT/EP1999/007885 EP9907885W WO0130101A1 WO 2001030101 A1 WO2001030101 A1 WO 2001030101A1 EP 9907885 W EP9907885 W EP 9907885W WO 0130101 A1 WO0130101 A1 WO 0130101A1
Authority
WO
WIPO (PCT)
Prior art keywords
network entity
network
mobile
old
location
Prior art date
Application number
PCT/EP1999/007885
Other languages
English (en)
Inventor
Ahti Muhonen
Teemu MÄKINEN
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
Priority to EP99952597A priority Critical patent/EP1222835A1/fr
Priority to PCT/EP1999/007885 priority patent/WO2001030101A1/fr
Priority to AU64735/99A priority patent/AU6473599A/en
Publication of WO2001030101A1 publication Critical patent/WO2001030101A1/fr

Links

Classifications

    • 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
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • 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
    • H04W8/08—Mobility data transfer
    • H04W8/12—Mobility data transfer between location registers or mobility servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support

Definitions

  • the present invention relates to a method and network entity for performing a location update in a Super-Charged network, i.e. a mobile network in which a Super-Charger concept is used to optimize mobility management signaling.
  • UMTS Universal Mobile Telecommunications System
  • GSM Global System for Mobile Communications
  • VLR Visitor Location Register
  • SGSN Serving GPRS Support Node
  • the term "network entity” is used to designate any network element which may serve a mobile user and which may comprise a data base for storing subscriber data.
  • subscriber data is used to designate all kind of information associated with a subscription which is required for service provisions, identification, authentication, routing, call handling, charging, subscriber tracing, operation and maintenance purposes. Some subscriber data is referred to as permanent subscriber data, i.e. it can only be changed by administration means. Other data is temporary subscriber data which may change as a result of normal operation of the system.
  • the HLR contains all permanent subscriber data and all relevant temporary subscriber data for all mobile subscribers permanently registered in the HLR.
  • the VLR contains all subscriber data required for call handling and other purposes for mobile subscribers currently located in the area controlled by the VLR.
  • the Super-Charger concept is used to modify subscriber data handling to reduce the signaling load associated with roaming.
  • the reduction in signaling load is achieved without introducing a new network node, but requires new functionality within the network.
  • the aim of the Super-Charger concept is to reduce the mobility management costs associated with inter-VLR and SGSN location updates. Instead of canceling the subscriber data at the old VLR or SGSN when the subscriber moves to a location area served by a different
  • the Super-Charger concept suggests maintaining the subscriber data at the old VLR or SGSN so as to remove the need to use a cancel location procedure.
  • the HLR then performs the normal insertion procedure of the subscriber data at the new VLR or SGSN, and maintains the subscriber data at the old VLR or SGSN. Therefore, no additional signaling is required.
  • the mobile network benefits from this Super-Charger concept when the subscriber roams to a previously visited VLR or SGSN, since the user's subscription data is already present. In this case, provided that the subscription data is still valid, the need to perform the insert subscriber data procedure is removed. Consequently, the Super-Charger concept reduces mobility management costs by reducing the volume of location update signaling.
  • VLR has the option to use the subscriber data previously downloaded.
  • the user's subscription data is retained by the VLR despite the move of the subscriber to another VLR.
  • the subscription data is retained by the VLR upon leaving the travel location, and an insert subscriber data procedure is not necessary at the home location, since the user's subscription data is already present at the VLR serving the home location.
  • the subscriber information is no longer deleted from the VLR or SGSN data base when a mobile station leaves the area served by the VLR or SGSN.
  • a new data management system may be based on two options, i.e. the old subscriber data may either be deleted periodically using an audit system or may be deleted dynamically to make room for newly arrived subscribers.
  • the Super-Charger concept modifies the location update procedures to reduce the cost of inter- VLR and SGSN mobility management.
  • a new pa- ra eter is added to the MAP UPDATE LOCATION and MAP UPDATE GPRS LOCATION messages, which indicates whether the VLR or SGSN requires subscriber data.
  • the MAP MS PURGE message is no longer sent when inactive subscription data is removed from the VLR or SGSN data bases during data base management procedures.
  • the subscriber's IMSI International Mobile Subscriber Identity
  • Subscriber Identity is retrieved from the mobile station instead of the old VLR, wherein the authentication triplets are already available in the data base serving the mobile station. Thus, a communication of the authentication trip- lets from the old VLR is not required.
  • the VLRs allocate a unique TMSI (Temporary Mobile Subscriber Identity) to visiting mobile subscribers. There- fore, the VLR is capable of correlating the IMSI of a mobile station and the current TMSI for that mobile station. Similarly, in GPRS (General Packet Radio Service) networks, a packet TMSI (P-TMSI) is used for identifying a mobile station. If old and new location areas are managed by dif- ferent VLRs or SGSNs, the old VLR or SGSN is not made aware of the fact that the subscriber has left its service area in a Super-Charged environment. Thus, the efficiency of the TMSI management in the VLR or the SGSN is decreased, since the TMSI or P-TMSI value range is a limited resource.
  • TMSI Temporal Mobile Subscriber Identity
  • a method for performing a location update in a Super-Charged environment of a mobile net- work comprising the steps of: transmitting a location update request message from a new network entity serving a mobile terminal to said mobile network; transmitting a release message from the mobile network to an old network entity having served the mobile terminal before, in response to the receipt of the location update request message; and releasing a subscriber identity allocated to the mobile terminal at the old network entity in response to the re-
  • a network entity for performing a location update procedure for a mobile terminal in a Super-Charged environment of a mobile network, said network entity comprising: detecting means for detecting a location update request message received from the mobile network; message generation means for generating a release message in response to the detection result of the detection means, the release message being a request to release a subscriber identity allocated to the mobile terminal; and transmitting means for transmitting the release message to an old network entity having served the mobile terminal.
  • a network entity for performing a location update procedure for a mobile terminal in a Super-Charged environment of a mobile network, said network entity comprising: receiving means for receiving a release message from the mobile network; release means for releasing a subscriber identity allocated to the mobile terminal in response to the receipt of the release message; and memory control means for maintaining subscriber data corresponding to the subscriber identity, irrespective of the release of the subscriber identity.
  • subscriber identity numbers are released or de-allocated while still maintaining the corresponding subscriber data in the old network entity.
  • the subscriber identities are released and can be re-allocated when the subscriber moves to a new location area managed by a different network entity.
  • the efficiency of the subscriber identity management in the network entities can be increased without requiring additional timer functions or audit systems.
  • the release message is transmitted from a home location register.
  • the subscriber identity may be a TMSI or a P-TMSI.
  • the network entity may be a VLR or a SGSN.
  • the release message may be a cancel location operation.
  • Fig. 1 shows a basic block diagram indicating network components participating at a location update procedure
  • Fig. 2 shows a transmission diagram indicating message flows for an inter-VLR location update in a Super-Charged GSM network according to the preferred embodiment of the present invention
  • Fig. 3 shows a basic block diagram of a network entity for performing a location update procedure according to the preferred embodiment of the present invention
  • Fig. 4 shows a basic block diagram of another network en- tity for performing a location update procedure according to the preferred embodiment of the present invention.
  • the Super-Charged GSM network com- prises a HLR 4 arranged at the home PLMN of a mobile terminal or mobile station (MS) 1.
  • the subscription data of the MS 1 is permanently stored.
  • the MS 1 is moving from a location area served by an old VLR 30 to a new location area served by a new VLR 31.
  • the connection between the MS 1 and the old VLR 30 or the new VLR 31 is established via an old Base Station Subsystem (BSS) 20 and a new BSS 21, respectively.
  • BSS Base Station Subsystem
  • the BSS is a sub-system of the Base Station equipment, i.e. transceivers, controllers, etc., which is viewed by the network through a single interface.
  • the HLR 4 is a data base in charge of the management of the MS 1 and other mobile subscribers.
  • the PLMN may contain one or several HLRs, depending on the number of mobile subscribers, the capacity of the equipment and the organization of the network.
  • the main subscription information stored in the HLR 4 concerns the location of the MS 1 in order to be able to route calls to the MS 1. All management interventions occur on this data base.
  • the MS 1 When the MS 1 is roaming in a location area of the network, it is controlled by a VLR in charge of this area. When the MS 1 appears in the location area of the new VLR 31, it starts a location updating procedure. A Mobile Switching Center (MSC, not shown) in charge of that area notices this registration and transfers the identity of the location area where the MS 1 is situated to the new VLR 31.
  • MSC Mobile Switching Center
  • the new VLR 31 transmits a location update request to the HLR 4 in response to the receipt of a location update request from the MS 1. Then, the HLR 4 transmits a release command to the old VLR 30, which may be acknowledged by the old VLR 30. Then, the HLR 4 transmits a location update acknowledgment to the new VLR 31 to thereby terminate the location update procedure. Having received the release command, the old VLR 30 may release the allocation of the TMSI to the MS 1. Thus, even in the Super-Charged environment, the old VLR 30 is aware of the fact that the MS 1 has left its location area. In the above-described case shown in Fig.
  • the subscription data of the MS 1 is already available at the new VLR 31, since the location area of the new VLR 31 has been pre- viously visited by the MS 1, as in the case of the described evening commute.
  • the HLR 4 performs the normal insert subscriber data procedure at the new VLR 31, wherein the subscriber data is maintained at the old VLR 30.
  • Fig. 2 shows a transmission diagram of the message flow in the above-described case of Fig. 1.
  • the MS 1 has previously visited the location area served by the VLR 31.
  • the MS 1 transmits a location update request to the new VLR 31, wherein the location update request contains a LAI (Location Area Identity) of the location area served by the old VLR 30.
  • the new VLR 31 transmits an Identity Request to the MS 1 in order to request the mobile station to provide its IMSI transmitted with a subsequent Identity Response from the MS 1 to the new VLR 31.
  • an authentication signaling is performed.
  • the new VLR 31 transmits an Update Location Request indicating that no subscription data is required to the HLR 4.
  • the HLR 4 performs a check of the subscriber data as regards any change requiring an update procedure of the subscription data. Thereafter, the HLR 4 transmits a release command to the old VLR 30 in order to trigger the release of the TMSI at the old VLR 30.
  • This release command may be a modified MAP-operation Cancel Location.
  • ASN.l Abstract Syntax Notation One
  • the release command may be acknowledged by the old VLR 30 using a Release Acknowledgment message. Then, the HLR 4 transmits an Update Location Acknowledgment message to the new VLR 31 to thereby indicate the successful completion of the location update procedure.
  • Fig. 3 shows a basic block diagram of a network entity such as a VLR or an SGSN serving a predetermined location area.
  • the network entity comprises a transceiver (TRX) 301 arranged for transmitting and receiving subscriber data or messages to or from a mobile network.
  • TRX transceiver
  • a location update procedure is performed, wherein subscription data is received by the TRX 301 from the HLR 4 and stored into a data base 303 via a memory control unit 302 arranged for controlling reading and writing into the database 303.
  • a TMSI release unit 304 is provided and connected to the reception output of the TRX 301.
  • the TMSI release unit 304 is arranged to detect a release command re- ceived from the HLR 4 and to control the memory control unit 302 so as to release the respective TMSI allocated to a subscriber indicated in the release message.
  • the memory control unit 302 releases or deallocates the TMSI which may then be allocated to a new subscriber.
  • Fig. 4 shows a basic block diagram of the HLR 4 or any other network entity provided as a data base in charge of the management of mobile subscribers.
  • the network entity comprises a transceiver (TRX) 41, arranged for transmitting and receiving subscriber data or messages from or to the mobile network.
  • TRX transceiver
  • a message detection unit 42 is provided, which is arranged to detect a location update request message received from the mobile network and to output a corresponding indication to a message generation unit 43. Based on the subscriber information included in the location update request message and supplied from the message detection unit 42, the message generation unit 43 generates a release message indi- eating the IMSI of the respective subscriber requesting the location update.
  • the release message is supplied to the TRX 41 in order to be transmitted via the mobile network to the old VLR or SGSN having served the mobile subscriber.
  • the basic block diagrams shown in Figs. 3 and 4 only comprise those components essential for performing the functions required for the present invention. Any other components of the shown network entities have been omitted for reasons of simplicity.
  • the functions of the respective blocks shown in Figs. 3 and 4 may be achieved by corresponding sub-routines of a control program controlling a processing unit, e.g. CPU, arranged in the respective network entity.
  • the present invention relates to a method and network entity for performing a location update in a Super- Charged environment of a mobile network, wherein a release message is transmitted from the mobile network to an old network entity having served a mobile terminal, in response to a location update request message received from a new network entity 31 serving the mobile terminal 1.
  • a subscriber identity allocated to the mobile terminal 1 at the old network entity 30 is released or de-allocated in re- sponse to the receipt of the release message.
  • the old network entity is informed of the fact that the mobile terminal 1 has left its service area, and may re-allocate the subscriber identity which has been allocated to the mobile terminal 1.

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  • Engineering & Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et une entité de réseau servant à exécuter une mise à jour d'emplacement dans un environnement super chargé d'un réseau mobile. Un message de libération est transmis par le réseau mobile à une ancienne entité de réseau ayant desservi un terminal mobile, en réponse à un message de demande de mise à jour d'emplacement reçu d'une nouvelle entité (31) de réseau desservant le terminal mobile (1). Une identité d'abonné affectée au terminal mobile (1) de l'ancienne entité (31) de réseau est libérée ou désaffectée en réponse à la réception du message de libération. Ainsi, même dans un environnement super-chargé, l'ancienne entité de réseau est informée du fait que le terminal mobile (1) a quitté sa zone de service, et peut réaffecter l'identité d'abonné qui a été affectée au terminal mobile (1).
PCT/EP1999/007885 1999-10-18 1999-10-18 Mise a jour d'emplacement dans un environnement super charge WO2001030101A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP99952597A EP1222835A1 (fr) 1999-10-18 1999-10-18 Mise a jour d'emplacement dans un environnement super charge
PCT/EP1999/007885 WO2001030101A1 (fr) 1999-10-18 1999-10-18 Mise a jour d'emplacement dans un environnement super charge
AU64735/99A AU6473599A (en) 1999-10-18 1999-10-18 Location update in a super-charged environment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1999/007885 WO2001030101A1 (fr) 1999-10-18 1999-10-18 Mise a jour d'emplacement dans un environnement super charge

Publications (1)

Publication Number Publication Date
WO2001030101A1 true WO2001030101A1 (fr) 2001-04-26

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PCT/EP1999/007885 WO2001030101A1 (fr) 1999-10-18 1999-10-18 Mise a jour d'emplacement dans un environnement super charge

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EP (1) EP1222835A1 (fr)
AU (1) AU6473599A (fr)
WO (1) WO2001030101A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007138430A1 (fr) * 2006-05-31 2007-12-06 Nokia Corporation Gestion des informations de profil d'utilisateur
WO2008020235A2 (fr) 2006-08-18 2008-02-21 Vodafone Group Plc Transfert intercellulaire d'un centre de commutation mobile

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991014349A1 (fr) * 1990-03-08 1991-09-19 Telefonaktiebolaget Lm Ericsson Systeme et procede d'affectation dynamique de numeros d'acheminement d'appels a des abonnes mobiles
US5123111A (en) * 1990-01-19 1992-06-16 Alcatel Cit Cellular radiotelephone system, a method of protecting the data base of a visitor location register against saturation
US5375251A (en) * 1991-06-14 1994-12-20 Standard Elektrik Lorenz Aktiengesellschaft Method for generating a temporary mobile subscriber identity signal (TMSI) from a permanent mobile station identity signal (TMSI)
US5713073A (en) * 1994-08-23 1998-01-27 Nokia Telecommunications Oy Location updating in a mobile communication system
WO1998047305A2 (fr) * 1997-04-15 1998-10-22 Northern Telecom Limited Systeme de communication a gestion amelioree du contenu de la memoire des positions des utilisateurs occasionnels et procede de fonctionnement
WO1998049846A2 (fr) * 1997-04-30 1998-11-05 Telefonaktiebolaget Lm Ericsson (Publ) Systeme et procede pour gerer des parametres d'identite temporaire de station mobile (tmsi)
US5898922A (en) * 1994-05-20 1999-04-27 Siemens Aktiengesellschaft Mobile radio system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5123111A (en) * 1990-01-19 1992-06-16 Alcatel Cit Cellular radiotelephone system, a method of protecting the data base of a visitor location register against saturation
WO1991014349A1 (fr) * 1990-03-08 1991-09-19 Telefonaktiebolaget Lm Ericsson Systeme et procede d'affectation dynamique de numeros d'acheminement d'appels a des abonnes mobiles
US5375251A (en) * 1991-06-14 1994-12-20 Standard Elektrik Lorenz Aktiengesellschaft Method for generating a temporary mobile subscriber identity signal (TMSI) from a permanent mobile station identity signal (TMSI)
US5898922A (en) * 1994-05-20 1999-04-27 Siemens Aktiengesellschaft Mobile radio system
US5713073A (en) * 1994-08-23 1998-01-27 Nokia Telecommunications Oy Location updating in a mobile communication system
WO1998047305A2 (fr) * 1997-04-15 1998-10-22 Northern Telecom Limited Systeme de communication a gestion amelioree du contenu de la memoire des positions des utilisateurs occasionnels et procede de fonctionnement
WO1998049846A2 (fr) * 1997-04-30 1998-11-05 Telefonaktiebolaget Lm Ericsson (Publ) Systeme et procede pour gerer des parametres d'identite temporaire de station mobile (tmsi)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007138430A1 (fr) * 2006-05-31 2007-12-06 Nokia Corporation Gestion des informations de profil d'utilisateur
WO2008020235A2 (fr) 2006-08-18 2008-02-21 Vodafone Group Plc Transfert intercellulaire d'un centre de commutation mobile
WO2008020235A3 (fr) * 2006-08-18 2008-04-03 Vodafone Plc Transfert intercellulaire d'un centre de commutation mobile
GB2441213B (en) * 2006-08-18 2011-04-20 Vodafone Plc Mobile switching centre handover
US8396471B2 (en) 2006-08-18 2013-03-12 Vodafone Group Plc Mobile switching centre handover

Also Published As

Publication number Publication date
EP1222835A1 (fr) 2002-07-17
AU6473599A (en) 2001-04-30

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