WO1996034503A1 - Dual mode mobile telecommunications system - Google Patents

Dual mode mobile telecommunications system Download PDF

Info

Publication number
WO1996034503A1
WO1996034503A1 PCT/GB1996/000986 GB9600986W WO9634503A1 WO 1996034503 A1 WO1996034503 A1 WO 1996034503A1 GB 9600986 W GB9600986 W GB 9600986W WO 9634503 A1 WO9634503 A1 WO 9634503A1
Authority
WO
WIPO (PCT)
Prior art keywords
network
gsm
telecommunication system
subscriber
satellite network
Prior art date
Application number
PCT/GB1996/000986
Other languages
French (fr)
Inventor
Richard James Skaife
Original Assignee
Aethos Communication Systems
Pt Pasifik Satelit Nusantara
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 Aethos Communication Systems, Pt Pasifik Satelit Nusantara filed Critical Aethos Communication Systems
Priority to AU54048/96A priority Critical patent/AU5404896A/en
Publication of WO1996034503A1 publication Critical patent/WO1996034503A1/en

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
    • H04W8/08—Mobility data transfer
    • H04W8/12—Mobility data transfer between location registers or mobility servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18563—Arrangements for interconnecting multiple systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • This invention relates to radio telecommunications systems, especially mobile telecommunications systems.
  • GSM refers to the Global System for Mobile Communications, which has been developed as a standard for land-based telecommunications systems so that a subscriber in one system can make and receive calls using his mobile telephone when he leaves the fixed radio network of the home system and moves into the fixed radio network of a visited system.
  • Each system has an associated mobile switching centre MSC which operates to route calls to and from subscribers' telephones in the home system, and via the MSCs of visited systems to and from subscribers' telephones in visited systems.
  • MSC mobile switching centre
  • a Home Location Register HLR, a Visiting Location Register NLR and an Authentication Centre AuC are also associated with
  • Each subscriber is issued with a unique International Mobile Subscriber Identity IMSI which is incorporated in a Subscriber Identification Mobile SIM of the subscriber's telephone, and is used in an authentication procedure every time a subscriber requests telephone access to the system.
  • the subscriber's LMSI is registered in the HLR of his home system together with other details about the services the subscriber is allowed.
  • His IMSI is used in the registration process to interrogate his HLR to obtain his service details, and to supply location information to the HLR for forwarding incoming calls to the subscriber in the visited system.
  • An authentication procedure is also initiated using authentication information from the AuC of the home system.
  • the radio network itself consists of a base station sub-system BSS comprising a base station controller BSC and several base transceiver stations BTS, each of which provides a radio cell of one or more channels.
  • BSS base station sub-system BSS
  • BTS base transceiver stations
  • a subscriber initiates a call, his telephone searches for a local base station so as to synchronise with a BTS and set up a route via the BSC to the MSC.
  • the interface between the BSS and the MSC, and the links between MSCs comply with the GSM standard, and have the general features identified above.
  • the present invention consists in providing a radio telecommunication system in which subscribers can receive services via alternative types of radio networks, such as a direct access mobile satellite network and a terrestrial/land-based network.
  • the mobile telephone for a direct access mobile satellite network is adapted so that it can alternatively access a land-based GSM network using the same SIM/IMSI as when accessing the satellite network, the satellite network being designed in accordance with the same GSM standard.
  • a subscriber to the satellite network can therefore roam on to the land-based GSM network and still be contactable on the same telephone number.
  • the network architecture of the switching, security management and mobility management/location management of the satellite network is provided by a GSM system comprising MSC,HLR and AuC, as shown in the accompanying drawing.
  • the satellite system uses standard GSM HLR management procedures and protocols, and standard GSM authentication procedures.
  • the satellite network also uses standard GSM authentication procedures.
  • the SIM is preferably a standard GSM SIM with standard GSM numbering structures.
  • the satellite network uses GSM standard numbering systems with IMSJXi (IMSI personal key) and MSISDN (subscriber number) complying with GSM.
  • IMSJXi IMSI personal key
  • MSISDN subscriber number
  • the necessary network identities are compliant and registered with GSM MoU (Memorandum of Understanding) methods, so all GSM networks know the satellite network identity codes.
  • the satellite network operator has a roaming agreement with the GSM network.
  • Links are provided between the MSCs of the satellite network and the GSM network. Since the satellite network MSC/HLR AuC is a fully compliant GSM architecture, this appears to the GSM network as if it is another GSM network with the MSC acting as the gateway MSC. The GSM network cannot "see" the different architecture beyond the interface with the radio sub-system providing the satellite radio link (i.e. the A-interface).
  • a subscriber to the satellite network service has a subscription registered in the satellite HLR as his home network, and the appropriate Ki is held in the satellite network AuC.
  • the SIM in the subscribers' mobile telephone is programmed to select the satellite network as its preferred network.
  • the telephone When the telephone is under satellite coverage only, it registers in the satellite HLR and obtains service.
  • the telephone When the telephone is under satellite and GSM coverage, it "sees" both networks, but selects the satellite network as its preferred network and registers on that network.
  • the subscriber may, however, elect to join the GSM service instead, and manually selects this using a network selection function on his telephone. Since he does not subscribe to this GSM network as his home network, the GSM network enters the GSM roaming authentication and location procedure.
  • the subscriber's telephone When the subscriber's telephone is under GSM coverage only, it uses the GSM network, and joins the network as a roaming subscriber. Should the subscriber re-enter the satellite coverage, his telephone will then automatically rejoin the satellite network, as this network
  • the HLR interrogation points to the satellite network NLR, and the call is handled via the satellite network MSC. If the subscriber is registered in the GSM network, and an inbound call enters the satellite network MSC, the location procedures will set the satellite HLR entry to point to the GSM network NLR since the subscriber is registered in the NLR of the GSM network. The call is therefore routed via the inter MSC link to the GSM network.
  • the mobile telephone for a land-based GSM network is adapted so that it can alternatively access a direct access mobile satellite network using the same SIM/IMSI as when accessing the land-based GSM network, the satellite network being designed in accordance with the same GSM standard.
  • the subscriber to the GSM network is equipped with a dual mode telephone. His home network is the GSM network, and the GSM network is the preferred network. However, the subscriber is able to "roam" onto the satellite network in a GSM style roaming method.
  • the subscriber is automatically contactable on one telephone number (his MSISD ⁇ ), irrespective of whether he is on the satellite network or the GSM network.

Abstract

A dual mode telecommunication system is provided whereby a subscriber's mobile telephone can make and receive calls using either a terrestrial GSM network or a satellite network.

Description

DUAL MODE MOBILE TELECOMMUNICATIONS SYSTEM
This invention relates to radio telecommunications systems, especially mobile telecommunications systems.
GSM refers to the Global System for Mobile Communications, which has been developed as a standard for land-based telecommunications systems so that a subscriber in one system can make and receive calls using his mobile telephone when he leaves the fixed radio network of the home system and moves into the fixed radio network of a visited system.
Each system has an associated mobile switching centre MSC which operates to route calls to and from subscribers' telephones in the home system, and via the MSCs of visited systems to and from subscribers' telephones in visited systems. A Home Location Register HLR, a Visiting Location Register NLR and an Authentication Centre AuC are also associated with
the MSC of each system.
Each subscriber is issued with a unique International Mobile Subscriber Identity IMSI which is incorporated in a Subscriber Identification Mobile SIM of the subscriber's telephone, and is used in an authentication procedure every time a subscriber requests telephone access to the system. The subscriber's LMSI is registered in the HLR of his home system together with other details about the services the subscriber is allowed. When a subscriber moves into the radio network of another system and his telephone is turned on, he is registered in the NLR of the visited system. His IMSI is used in the registration process to interrogate his HLR to obtain his service details, and to supply location information to the HLR for forwarding incoming calls to the subscriber in the visited system. An authentication procedure is also initiated using authentication information from the AuC of the home system.
The radio network itself consists of a base station sub-system BSS comprising a base station controller BSC and several base transceiver stations BTS, each of which provides a radio cell of one or more channels. When a subscriber initiates a call, his telephone searches for a local base station so as to synchronise with a BTS and set up a route via the BSC to the MSC. The interface between the BSS and the MSC, and the links between MSCs comply with the GSM standard, and have the general features identified above.
It will be appreciated that the operators of different GSM mobile telephone systems can readily cooperate to allow roaming of their subscribers in the other systems, based on the subscribers' unique LMSIs and the common registration and authentication processes used in these systems. The links between the MSCs support the necessary control signalling and the forwarding of calls to subscribers. The operators only need to agree other operational characteristics such as the monitoring and billing of subscribers visiting/roaming from other systems.
The present invention consists in providing a radio telecommunication system in which subscribers can receive services via alternative types of radio networks, such as a direct access mobile satellite network and a terrestrial/land-based network. According to one embodiment, the mobile telephone for a direct access mobile satellite network is adapted so that it can alternatively access a land-based GSM network using the same SIM/IMSI as when accessing the satellite network, the satellite network being designed in accordance with the same GSM standard. A subscriber to the satellite network can therefore roam on to the land-based GSM network and still be contactable on the same telephone number.
The network architecture of the switching, security management and mobility management/location management of the satellite network is provided by a GSM system comprising MSC,HLR and AuC, as shown in the accompanying drawing. The satellite system uses standard GSM HLR management procedures and protocols, and standard GSM authentication procedures. The satellite network also uses standard GSM authentication procedures.
The SIM is preferably a standard GSM SIM with standard GSM numbering structures. The satellite network uses GSM standard numbering systems with IMSJXi (IMSI personal key) and MSISDN (subscriber number) complying with GSM. The necessary network identities are compliant and registered with GSM MoU (Memorandum of Understanding) methods, so all GSM networks know the satellite network identity codes.
The satellite network operator has a roaming agreement with the GSM network. Links are provided between the MSCs of the satellite network and the GSM network. Since the satellite network MSC/HLR AuC is a fully compliant GSM architecture, this appears to the GSM network as if it is another GSM network with the MSC acting as the gateway MSC. The GSM network cannot "see" the different architecture beyond the interface with the radio sub-system providing the satellite radio link (i.e. the A-interface).
A subscriber to the satellite network service has a subscription registered in the satellite HLR as his home network, and the appropriate Ki is held in the satellite network AuC.
The SIM in the subscribers' mobile telephone is programmed to select the satellite network as its preferred network. When the telephone is under satellite coverage only, it registers in the satellite HLR and obtains service. When the telephone is under satellite and GSM coverage, it "sees" both networks, but selects the satellite network as its preferred network and registers on that network. The subscriber may, however, elect to join the GSM service instead, and manually selects this using a network selection function on his telephone. Since he does not subscribe to this GSM network as his home network, the GSM network enters the GSM roaming authentication and location procedure.
When the subscriber's telephone is under GSM coverage only, it uses the GSM network, and joins the network as a roaming subscriber. Should the subscriber re-enter the satellite coverage, his telephone will then automatically rejoin the satellite network, as this network
is its network of choice.
If the subscriber is registered in the satellite network and an inbound call is made from the PSTN network to the satellite network, the HLR interrogation points to the satellite network NLR, and the call is handled via the satellite network MSC. If the subscriber is registered in the GSM network, and an inbound call enters the satellite network MSC, the location procedures will set the satellite HLR entry to point to the GSM network NLR since the subscriber is registered in the NLR of the GSM network. The call is therefore routed via the inter MSC link to the GSM network.
In an alternative embodiment of the invention, the mobile telephone for a land-based GSM network is adapted so that it can alternatively access a direct access mobile satellite network using the same SIM/IMSI as when accessing the land-based GSM network, the satellite network being designed in accordance with the same GSM standard.
The subscriber to the GSM network is equipped with a dual mode telephone. His home network is the GSM network, and the GSM network is the preferred network. However, the subscriber is able to "roam" onto the satellite network in a GSM style roaming method.
It will be appreciated that in both embodiments of the invention described above, the subscriber is automatically contactable on one telephone number (his MSISDΝ), irrespective of whether he is on the satellite network or the GSM network.

Claims

1. A radio telecommunication system, characterised in that subscribers can receive services via alternative types of radio networks.
2. A radio telecommunication system as claimed in claim 1, characterised in that the subscribers can receive services via a direct access mobile satellite network and a terrestrial network.
3. A radio telecommunication system as claimed in claim 1 or 2, characterised in that at least one subscriber can receive services via a GSM network.
4. A radio telecommunication system as claimed in claim 2 or claim 3 when dependent on claim 2, characterised in that the satellite network is operated in accordance with the GSM standard.
5. A radio telecommunication system as claimed in any one of the preceding claims, characterised in that a mobile telephone for a direct access mobile satellite network is adapted so that it can alternatively access a land-based GSM network using a same international mobile subscriber identity as when accessing a satellite network, the satellite network being designed in accordance with the same GSM standard.
6. A telecommunication system as claimed in claim 4 and 5, characterised in that the satellite network has a switching, security management and mobility/location management system provided by a GSM system comprising a GSM, HLR and AuC.
7. A telecommunication system as claimed in any one of the preceding claims, characterised in that each telephone has a subscriber identification mobile (SIM) in accordance with standard GSM numbering structures.
8. A telecommunication system as claimed in claim 7 when dependent on claim 2 or claim 5, characterised in that satellite network uses standard GSM numbering systems with an international mobile subscriber identity personal key and a subscriber number complying with GSM standards.
9. A telecommunication system as claimed in any one of the preceding claims in which a subscriber can roam between a satellite network and a terrestrial GSM network.
10. A telecommunication system as claimed in any one of the preceding claims, characterised in that a subscriber's mobile telephone is programmed to select a satellite network as its preferred network and in that the telephone will register with a terrestrial network when only the terrestrial network is available.
11. A telecommunication system as claimed in claim 10, characterised in that the telephone is manually controllable to select either a satellite network or a terrestrial network.
12. A telecommunication system as claimed in any one of claims 1 to 9, characterised in that a subscriber's mobile telephone for a terrestrial network is adapted so that it can alternatively access a direct access mobile satellite network using a same international mobile subscriber identity as when accessing the terrestrial GSM network, the
satellite network being designed in accordance with the same GSM standard.
13. A telecommunication system as claimed in claim 12, characterised in that the telephone is programmed to select the terrestrial GSM network as its preferred network.
PCT/GB1996/000986 1995-04-25 1996-04-25 Dual mode mobile telecommunications system WO1996034503A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU54048/96A AU5404896A (en) 1995-04-25 1996-04-25 Dual mode mobile telecommunications system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9508367.1 1995-04-25
GBGB9508367.1A GB9508367D0 (en) 1995-04-25 1995-04-25 Telecommunication systems

Publications (1)

Publication Number Publication Date
WO1996034503A1 true WO1996034503A1 (en) 1996-10-31

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Cited By (21)

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Publication number Priority date Publication date Assignee Title
EP0831599A2 (en) * 1996-09-04 1998-03-25 Globalstar L.P. Automatic satellite/terrestrial mobile terminal roaming system
WO1998020695A2 (en) * 1996-11-01 1998-05-14 Ericsson Inc. System and method for improved paging and location updating of mobile subscribers
EP0854591A2 (en) * 1997-01-21 1998-07-22 ICO Services Ltd. Multi-service terrestrial and satellite telephone system and method
WO1998037709A2 (en) * 1997-02-20 1998-08-27 Vodafone Limited Telecommunications arrangements and methods
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FR2779898A1 (en) * 1998-06-16 1999-12-17 Sagem COMMUNICATION METHOD FOR A CELLULAR AND SATELLITE RADIO COMMUNICATION TERMINAL, AND TERMINAL FOR IMPLEMENTING THE METHOD
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GB2404818A (en) * 2003-08-01 2005-02-09 Agilent Technologies Inc Satellite UMTS based distress transmitters for personal use.
US9730146B2 (en) 2002-02-26 2017-08-08 Lincoln J. Unruh System and method for reliable communications over multiple packet RF networks
US10187904B2 (en) 2008-02-29 2019-01-22 Koninklijke Kpn N.V. Telecommunications network and method for time-based network access

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Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0831599A2 (en) * 1996-09-04 1998-03-25 Globalstar L.P. Automatic satellite/terrestrial mobile terminal roaming system
US6233463B1 (en) 1996-09-04 2001-05-15 Globalstar L.P. Automatic satellite terrestrial mobile terminal roaming system and method
US6072768A (en) * 1996-09-04 2000-06-06 Globalstar L.P. Automatic satellite/terrestrial mobile terminal roaming system and method
EP0831599A3 (en) * 1996-09-04 1999-01-20 Globalstar L.P. Automatic satellite/terrestrial mobile terminal roaming system
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WO1998020695A2 (en) * 1996-11-01 1998-05-14 Ericsson Inc. System and method for improved paging and location updating of mobile subscribers
AU743571B2 (en) * 1996-11-01 2002-01-31 Ericsson Inc. System and method for improved paging and location updating of mobile subscribers
WO1998020695A3 (en) * 1996-11-01 1998-10-01 Ericsson Inc System and method for improved paging and location updating of mobile subscribers
US5946619A (en) * 1996-11-01 1999-08-31 Ericsson Inc System and method for improved paging and location updating of mobile subscribers
EP0854591A3 (en) * 1997-01-21 1999-06-23 ICO Services Ltd. Multi-service terrestrial and satellite telephone system and method
EP0854591A2 (en) * 1997-01-21 1998-07-22 ICO Services Ltd. Multi-service terrestrial and satellite telephone system and method
WO1998037709A3 (en) * 1997-02-20 1998-10-01 Vodafone Ltd Telecommunications arrangements and methods
WO1998037709A2 (en) * 1997-02-20 1998-08-27 Vodafone Limited Telecommunications arrangements and methods
US6580921B1 (en) * 1997-03-04 2003-06-17 Mitsubishi Denki Kabushiki Kaisha Dual-mode mobile telephone terminal
US6134437A (en) * 1997-06-13 2000-10-17 Ericsson Inc. Dual-mode satellite/cellular phone architecture with physically separable mode
WO1998057444A1 (en) * 1997-06-13 1998-12-17 Ericsson Inc. Dual-mode satellite/cellular phone architecture with physically separable modes
US6377804B1 (en) * 1997-06-24 2002-04-23 Nokia Mobile Phones Ltd. Mobile communication systems
WO1999019998A1 (en) * 1997-10-15 1999-04-22 Ericsson Inc. Satellite system utilizing a plurality of air interface standards and method employing same
US6052560A (en) * 1997-10-15 2000-04-18 Ericsson Inc Satellite system utilizing a plurality of air interface standards and method employing same
GB2337411A (en) * 1998-05-13 1999-11-17 Nec Technologies Interconnect controller
GB2337411B (en) * 1998-05-13 2002-09-18 Nec Technologies Interconnect controller
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FR2779898A1 (en) * 1998-06-16 1999-12-17 Sagem COMMUNICATION METHOD FOR A CELLULAR AND SATELLITE RADIO COMMUNICATION TERMINAL, AND TERMINAL FOR IMPLEMENTING THE METHOD
WO1999066659A1 (en) * 1998-06-16 1999-12-23 Sagem S.A. Method for communicating a cellular radio and satellite communication terminal, and terminal for implementing said method
EP0993131A1 (en) * 1998-10-06 2000-04-12 ICO Services Ltd. Communication apparatus and method for multimode terminal with removable data store
EP0998059A1 (en) * 1998-10-30 2000-05-03 ICO Services Ltd. Mobile communication terminal with a removable data module for access to a first or second communication network
WO2000038440A1 (en) * 1998-12-21 2000-06-29 Kent Ridge Digital Labs Mobile communications network
EP1075162A1 (en) * 1999-02-24 2001-02-07 Mitsubishi Denki Kabushiki Kaisha Multiple communication system, exchange and terminal
EP1075162A4 (en) * 1999-02-24 2002-08-21 Mitsubishi Electric Corp Multiple communication system, exchange and terminal
WO2000051266A1 (en) * 1999-02-25 2000-08-31 Motorola Inc. Satellite cellular communications using home network services
WO2002063892A3 (en) * 2001-02-08 2003-02-20 Ericsson Telefon Ab L M Dual-mode methods, systems, and terminals providing reduced mobile terminal registrations
WO2002063892A2 (en) * 2001-02-08 2002-08-15 Telefonaktiebolaget L.M. Ericsson (Publ) Dual-mode methods, systems, and terminals providing reduced mobile terminal registrations
EP1278310A2 (en) * 2001-07-17 2003-01-22 NTT DoCoMo, Inc. Mobile satellite communication network, system and method, program and computer-readable storage medium therefore
EP1278310B1 (en) * 2001-07-17 2009-02-25 NTT DoCoMo, Inc. Mobile satellite communication network, system and method, program and computer-readable storage medium therefore
US9730146B2 (en) 2002-02-26 2017-08-08 Lincoln J. Unruh System and method for reliable communications over multiple packet RF networks
US9743340B2 (en) 2002-02-26 2017-08-22 Lincoln J Unruh System and method for reliable communications over multiple packet RF networks
GB2404818A (en) * 2003-08-01 2005-02-09 Agilent Technologies Inc Satellite UMTS based distress transmitters for personal use.
GB2404818B (en) * 2003-08-01 2007-10-03 Agilent Technologies Inc Low-cost s-umts based distress transmitters for personal use
US10187904B2 (en) 2008-02-29 2019-01-22 Koninklijke Kpn N.V. Telecommunications network and method for time-based network access

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Publication number Publication date
GB9508367D0 (en) 1995-06-14
AU5404896A (en) 1996-11-18

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