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WO1999059359A1 - Radiotelephone cellulaire/satellite double mode - Google Patents

Radiotelephone cellulaire/satellite double mode Download PDF

Info

Publication number
WO1999059359A1
WO1999059359A1 PCT/JP1999/002424 JP9902424W WO9959359A1 WO 1999059359 A1 WO1999059359 A1 WO 1999059359A1 JP 9902424 W JP9902424 W JP 9902424W WO 9959359 A1 WO9959359 A1 WO 9959359A1
Authority
WO
WIPO (PCT)
Prior art keywords
satellite
cellular
dual mode
telephone
adapter
Prior art date
Application number
PCT/JP1999/002424
Other languages
English (en)
Inventor
Christophe Max Jean Jouin
Original Assignee
Nec 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 Nec Corporation filed Critical Nec Corporation
Priority to AU36302/99A priority Critical patent/AU3630299A/en
Publication of WO1999059359A1 publication Critical patent/WO1999059359A1/fr

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/185Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18563Arrangements for interconnecting multiple systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices

Definitions

  • This invention relates to radiotelephones and in particular it relates to dual mode cellular/satellite radiotelephones capable of operation with both cellular and satellite networks.
  • satellite adapter units In order to provide a convenient and cost effective dual mode radiotelephone for use with both cellular and satellite networks, satellite adapter units have been produced.
  • the satellite adapter units contain the additional circuitry and components to enable standard cellular telephones to communicate with a satellite network.
  • a dual mode satellite and celhilar radiotelephone comprises a cellular telephone, a satellite adapter, and a subscriber identity module (SIM).
  • the cellular telephone may be used independently of the satellite adapter .
  • the cellular telephone will be used for communication via a terrestrial cellular network.
  • the SIM is an electronic module or smart card which contains information specific to a particular user.
  • the SIM also contains authentication functions. In GSM networks the SIM, once installed in a cellular telephone, allows use of that telephone with the authorized cellular networks.
  • the cellular telephone in which the SIM is installed will have a unique identity in the form of an International mobile equipment identity (IMEI).
  • IMEI International mobile equipment identity
  • the satellite adapter to which the cellular telephone will be connected for satellite network use will also have a unique IMEI.
  • GSM systems currently rely mainly on the SIM data for authorization purposes and therefore the user's SIM may Lisually be installed in any telephone without loss of access to the cellular network. It is possible, however, for the IMEI to be checked by the network operator e.g. in order to identify stolen telephone hand sets.
  • a restriction on the number of cellular telephones able to make use of a particular satellite adapter is desirable for both manufacturer and network operator.
  • the manufacturer must be assured of a sufficient production volume to enable unit costs to fall to a level acceptable to the prospective purchasers.
  • the network operator will be able to control more easily the quality of the radiotelephones operating with the network and may obtain revenue from subscription more easily.
  • a dual mode celhilar/satellite telephone comprising, a satellite adapter for storing at least one number uniquely identifying a selected cellular telephone, receiving a random number from a cellular telephone and effecting security algorithm using said random number and unique identity number as inputs, comparing an output from said security algorithm and an output transmitted from said cellular telephone, only when a match is found in the comparison, continuing normal operation with said cellular telephone, and a cellular telephone when connected to said satellite adapter, for generating a random number and transmitting said random number to said satellite adapter and effecting security algorithm using said random number and unique identity number as inputs, transmitting said output from said security algorithm to said satellite adapter.
  • Fig.l is a block diagram of the main component parts of a dual mode cellular/satellite radiotelephone
  • Fig. 2 is a flowchart showing an operation of cellular telephone 1 in the dual mode cellular/satellite radiotelephone of Fig. l;
  • Fig.3 is a flowchart showing an operation of satellite adapter 2 in the dual mode cellular/satellite radiotelephone of Fig.2.
  • a dual mode satellite/cellular radiotelephone comprises a cellular telephone 1, satellite adapter 2, and SIM (Subscriber Identity Module) 3.
  • SIM Subscriber Identity Module
  • Cellular telephone 1 is designed for operation with the GSM networks and the satellite adapter 2 is designed to allow the cellular telephone 1, once connected to the satellite adapter 2, to operate with the satellite network.
  • the subscriber identity module (SIM) 3 is vised in the normal way and is not affected by implementation of the invention.
  • Cellular telephone 1 and satellite adapter 2 are uniquely identifiable by their respective IMEI numbers and the format of the IMEI numbers is a standard and well known format. With this arrangement due restriction is made in respect of the number of cellular telephones able to operate with a particular satellite adapter 2.
  • the IMEI numbers of the cellular phones permitted to operate with the satellite adapter 2 are entered into a read only memory in the satellite adapter by the manufacturer. An operation of cellular telephone 1 will be described below with reference to Fig.2.
  • step 101 On power up of the cellular telephone 1, in step 101 a check is made to determine whether or not the cellular telephone 1 is connected to a satellite adapter 2. If the cellular telephone 1 is not connected to an satellite adapter, then in step 107 normal cellular operation of the cellular telephone 1 will continue subject to the usual authorization checks. If the cellular telephone 1 is connected to an satellite adapter, then in step 102 the IMEI of the cellular telephone 1 is read and the IMEI reading provided as one input to a security algorithm. Such security algorithms are well known e.g. the GSM A3 algorithm (see TS GSM 03.20, "Security Related Network Functions" published by European Telecommunications Standards Institute). In step 103 a random number is generated by the cellular telephone 1. The random number provides the second input to the security algorithm and is also transmitted to the satellite adapter 2 in step 104.
  • GSM A3 algorithm see TS GSM 03.20, "Security Related Network Functions" published by European Telecommunications Standards Institute
  • step 105 cellular telephone 1 effects security algorithm using the IMEI and the random number.
  • step 106 the output from the security algorithm is transmitted to satellite adapter 2 for comparison therein with the outputs from a number of algorithms effected within the satellite adapter 2.
  • the security algorithms effected within the satellite adapter 2 have as an input one of the IMEI numbers stored in read only memory (ROM) and identifying uniquely the phones permitted to operate with the satellite adapter in question.
  • the second input to the security algorithms effected within satellite adapter 2 is the random number generated within and transmitted from cellular telephone 1.
  • satellite adapter 2 receives the random number from cellular telephone 1.
  • satellite adapter 2 performs security algorithms, and in step 203 receives the output of security algorithm effected in cellular telephone 1.
  • step 204 a check is made to determine whether or not the output from the security algorithm effected in satellite adapter 2 match the output from the security algorithm effected in cellular telephone 1. If both outputs match, in step 205 satellite adapter 2 continues normal operation. If the both outputs do not match, in step 206 satellite adapter 2 is disabled.
  • the sequence of security algorithms effected within satellite adapter 2 varies only in respect of the different IMEI numbers entered as inputs in each case.
  • the IMEI numbers used as inputs to the security algorithm are those numbers stored in ROM in satellite adapter 2. Although it is convenient in many cases for the IMEI numbers to be used as the unique identifiers for the selected cellular telephones the IMEI numbers may be replaced by or supplemented with other identifiers as described below.
  • the security algorithms within the satellite adapter 2 may be effected in parallel and each of the outputs fed to a separate register for individual comparison with the ovitput of the security algorithm effected within the cellular telephone 1. Alternatively the security algorithms in the satellite adapter 2 may be effected in sequence and compared one after another with the output of the security algorithm effected within the cellular telephone 1. In either case a match must be found in order for normal operation of the satellite adapter 2 to continue.
  • IMEI numbers As the unique identity for use with the interconnect controller has some advantages, it is likely to be inconvenient in some instances. Partial use of the IMEI (part IMEI) combined with a further separate identity nvimber to be entered at the point of sale would allow much more flexibility without a significant loss of control. That part of the IMEI descriptive of the manufacturer and descriptive of particular models or batches of telephones may, to advantage, be retained as part of the unique identity and a further separate identity number added as a prefix or suffix to the part IMEI.
  • the separate identity numbers could be the personal identity numbers (PINs) of the subscribers allocated use of a particular satellite adapter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un radiotéléphone cellulaire/satellite double mode restreignant l'utilisation d'un adaptateur satellite à des téléphones cellulaires spécifiés uniquement. Le téléphone cellulaire génère un numéro aléatoire destiné à servir d'entrée à une algorithme de sécurité et des numéros d'identité uniques relatifs aux téléphones cellulaires spécifiés sont également utilisés comme entrées pour l'algorithme de sécurité. Ces numéros d'identité uniques peuvent être l'identité internationale d'équipement mobile (IMEI) ou une partie de celle-ci assortie d'un numéro d'identité supplémentaire. Les numéros d'identification personnels (PIN) des abonnées peuvent également être utilisés comme partie de numéros d'identité uniques de manière à restreindre l'utilisation d'adaptateurs satellite à un certain nombre de modules d'identification d'abonné (SIM).
PCT/JP1999/002424 1998-05-13 1999-05-11 Radiotelephone cellulaire/satellite double mode WO1999059359A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU36302/99A AU3630299A (en) 1998-05-13 1999-05-11 Dual mode cellular/satellite radiotelephone

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9810106.6 1998-05-13
GB9810106A GB2337411B (en) 1998-05-13 1998-05-13 Interconnect controller

Publications (1)

Publication Number Publication Date
WO1999059359A1 true WO1999059359A1 (fr) 1999-11-18

Family

ID=10831874

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1999/002424 WO1999059359A1 (fr) 1998-05-13 1999-05-11 Radiotelephone cellulaire/satellite double mode

Country Status (3)

Country Link
AU (1) AU3630299A (fr)
GB (1) GB2337411B (fr)
WO (1) WO1999059359A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996008878A1 (fr) * 1994-09-14 1996-03-21 Ericsson Inc. Adaptateur de telecommunications par satellite pour combine cellulaire
WO1997043864A1 (fr) * 1996-05-10 1997-11-20 Telefonaktiebolaget Lm Ericsson (Publ) Fonction de reacheminement d'appel pour appareil de radiocommunication portable
GB2314483A (en) * 1996-06-21 1997-12-24 Orbitel Mobile Communications Mobile phone with additional plug-in communication module

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9508367D0 (en) * 1995-04-25 1995-06-14 Aethos Communication Systems Telecommunication systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996008878A1 (fr) * 1994-09-14 1996-03-21 Ericsson Inc. Adaptateur de telecommunications par satellite pour combine cellulaire
WO1997043864A1 (fr) * 1996-05-10 1997-11-20 Telefonaktiebolaget Lm Ericsson (Publ) Fonction de reacheminement d'appel pour appareil de radiocommunication portable
GB2314483A (en) * 1996-06-21 1997-12-24 Orbitel Mobile Communications Mobile phone with additional plug-in communication module

Also Published As

Publication number Publication date
GB2337411B (en) 2002-09-18
GB2337411A (en) 1999-11-17
GB9810106D0 (en) 1998-07-08
AU3630299A (en) 1999-11-29

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