WO1997024006A1 - Renvoi automatique des appels dans un radiotelephone mobile - Google Patents

Renvoi automatique des appels dans un radiotelephone mobile Download PDF

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Publication number
WO1997024006A1
WO1997024006A1 PCT/US1996/020001 US9620001W WO9724006A1 WO 1997024006 A1 WO1997024006 A1 WO 1997024006A1 US 9620001 W US9620001 W US 9620001W WO 9724006 A1 WO9724006 A1 WO 9724006A1
Authority
WO
WIPO (PCT)
Prior art keywords
mobile radio
call
forwarding
foreign
mobile
Prior art date
Application number
PCT/US1996/020001
Other languages
English (en)
Inventor
Robert A. Zak
Original Assignee
Ericsson Inc.
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 Ericsson Inc. filed Critical Ericsson Inc.
Priority to AU14218/97A priority Critical patent/AU1421897A/en
Publication of WO1997024006A1 publication Critical patent/WO1997024006A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/54—Arrangements for diverting calls for one subscriber to another predetermined subscriber
    • 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

Definitions

  • the present invention relates generally to radiotelephone communications systems, and more particularly to a mobile radiotelephone which automatically activates call-forwarding when the mobile radio is roaming in a foreign communications system outside its home system.
  • a typical mobile radiotelephone communications system consists of the following basic elements: at least one mobile terminal, a plurality of base stations, and at least one mobile telephone switching office (MTSO) . These elements are integrated to form a cellular mobile radiotelephone system that is connected to a public switched telephone networ (PSTN) .
  • PSTN public switched telephone networ
  • a mobile radiotelephone communicates in radio frequency (RF) signals with a base station.
  • the base station provides RF communications in a predetermined geographic area commonly referred to as a cell .
  • the base station receives a signal transmitted by the mobile radiotelephone, it transfers the signal to a MTSO via land line or alternate communications link.
  • the MTSO may route the signal to another mobile radio in the same cellular system or to a PSTN over an appropriate land line for transmission to a wireline subscriber or to another MTSO of the same or another cellular system.
  • Each mobile radiotelephone has an electronic serial number (ESN) and a telephone number (NAM) that is assigned to the mobile radiotelephone, and is listed with its home cellular system.
  • the cellular system also has a system ID code which is transmitted by each of its base stations on radio control channels.
  • ESN electronic serial number
  • NAM telephone number
  • the cellular system also has a system ID code which is transmitted by each of its base stations on radio control channels.
  • a mobile radio When a mobile radio registers with the cellular system or when it attempts to place a call, it identifies the cellular system by receiving the information transmitted on one of the control channels, and identifies itself to the cellular system by transmitting its ESN and NAM.
  • Most cellular systems allow mobile radios to "roam," i.e., to place and receive calls in a foreign system outside their home system even though the mobile radio user does not subscribe to the foreign system.
  • a mobile telephone user may subscribe to multiple home systems and be assigned to a NAM therein.
  • home system will hereafter refer to any system to which the user has subscribed.
  • most cellular systems allow “call-forwarding, " whereby, a mobile radio's home system forwards the mobile radio's incoming calls to the roaming system so that anyone attempting to call the mobile radio is not required to dial system-specific roamer access codes.
  • GTE Mobilnet 's "Follow-Me Roaming” is a system which allows call-forwarding to mobile radios roaming in foreign systems, and is disclosed in U.S. Patent No. 4,901,340 entitled “SYSTEM FOR THE EXTENDED PROVISION OF CELLULAR MOBILE RADIOTELEPHONE SERVICE” by Parker et al .
  • This system requires a mobile radio subscriber to manually dial a code (*31 or *18) to activate call-forwarding and does not disclose or suggest a mobile radio that automatically detects when it has entered a new roaming system and automatically sends the appropriate code to activate call- forwarding.
  • U.S. Patent No. 5,142,654 entitled "CELLULAR TELEPHONE SYSTEM AND METHOD FOR DYNAMICALLY SWITCHING BETWEEN CALL ROUTING OPTIONS" by Sonberg et al. discloses a cellular system which uses a central host computer to keep track of call delivery options for all mobile radios that are active in its network of MTSOs.
  • the roaming user must initially manually enter a code (*18 or *31) from the keypad of the terminal.
  • the code is received by one of the MTSOs and stored by the central computer. If the roaming user does not select the automatic call-forwarding option by entering the code, the system will automatically activate call-forwarding when the roaming user makes his first call from the foreign system.
  • the mobile radio user must inform his home system by calling the home system from a mobile or a landline phone and entering codes describing where he is roaming. The mobile user must repeat this manually every time he roams in a new system, and must know the 5-digit "city code.”
  • a primary object of the present invention to provide a novel mobile radiotelephone and method of operation which automatically detects when the mobile radiotelephone has entered a foreign cellular system and automatically transmits a proper, required call-forwarding activation code to the foreign cellular system.
  • a mobile radiotelephone to automatically activate call-forwarding when the mobile radiotelephone is roaming in a foreign cellular system is presented wherein the mobile radiotelephone receives a cellular system ID and compares it to the home cellular system ID for the radiotelephone stored in its memory. If the received cellular system ID differs from the stored home cellular system ID, the mobile radio retrieves from its memory an appropriate code required to enable call-forwarding and transmits the retrieved code to the foreign cellular system.
  • Figure 1 illustrates a basic cellular communication system.
  • Figure 2 is a schematic block diagram of the basic cellular communications system of Figure 1.
  • Figure 3 is a schematic block diagram of a mobile radio in which the automatic call-forwarding process of the present invention may be implemented.
  • Figure 4 is a flow chart illustrating automatic call- forwarding in a mobile radio in accordance with the present invention.
  • FIG 1 shows two cellular systems 10 and 12 which are each divided into a plurality of smaller cells 14.
  • Each cell 14 includes a base station 16.
  • the cellular system 10 is served by a MTSO 18, while the cellular system 12 is served by another MTSO 20.
  • the MTSOs 18 and 20 are linked respectively to each of their associated base stations 16 by dedicated land lines 22.
  • the MTSOs 18 and 20 route signals from the base stations 16 to the PSTN 24 by communications link 26 which may be wirelines, microwave, or fiber optics.
  • the two cellular systems 10 and 12 may also be referred to as a home system 28 and a foreign system 30, respectively.
  • the home system 28 and the foreign system 30 are each shown having two base stations 16a, 16b, and 16c, 16d, respectively, and each base station 16 has an associated antenna 40.
  • a mobile radio 42 establishes radio communications with the nearest base station 16d.
  • Communications link 22 carries audio, control and routing information between the base station 16d and the MTSO 20.
  • the MTSO 20 might establish a voice communications path between the base station 16d and the PSTN 24, and the PSTN 24 might further establish a voice communications path with the MTSO 18 of the home system 28 through communications link 26; the MTSO 18 then establishes voice communications with the appropriate base station (in the present example base station 16a) pursuant to the control and routing information, and the MTSO 18, in turn, signals the called mobile radio 44 and voice communications are established between the mobile radio 44 and the MTSO 18 via base station 16a when the user or subscriber answers.
  • the appropriate base station in the present example base station 16a
  • This network of base stations 16, MTSOs 18 and 20, and the PSTN 24 amply illustrates how communications can be established between the mobile radio 42 if roaming in the foreign system 30 and a mobile radio 44 in the home system 28.
  • the PSTN 24 may also establish voice communications between the MTSOs 18 and 20 and a conventional fixed site telephone 46, thus establishing a communications link between the calling mobile radio 42 and the conventional fixed site telephone 46.
  • a typical mobile radio 42 includes, as basic components, a transmitter unit 52, a receiver unit 54, a control head assembly 56, a microprocessor 58, a non-volatile memory 60, and an antenna assembly 62.
  • the automatic call-forwarding feature of the present invention is stored and retained in the non-volatile memory 60 and is executed by the microprocessor 58.
  • the non-volatile memory 60 retains stored data even after the power is turned off and accordingly, information and instructions required to carry out the automatic call-forwarding.
  • the call-forwarding activation codes typically *18 or *31
  • which had to be manually entered by the user prior to the present invention are also stored in the mobile radio's non-volatile memory 60.
  • the non-volatile memory 60 also stores three user- definable flags: "New System Notification,” “Auto-Forwarding Activation,” and “Confirmation Message.” These flags may be toggled either “on” or “off” by the user by scrolling through a menu of features shown on the display 56a using the keypad 56b and selecting the desired feature by operating predetermined keys on the keypad. These flags are pre-set to default values when the mobile radio 42 is manufactured but may be changed by the user.
  • FIG. 4 shows the automatic call-forwarding activation process in accordance with the present invention.
  • the process begins with the mobile radio initiating a telephone call by scanning a cell's dedicated communications channels to find a control channel as indicated by block 64.
  • the mobile radio 42 receives the system identification (SID) from the nearest base station assigned to that particular system over the control channel as indicated by block 68.
  • SID system identification
  • the SID code is then compared to a list of SID codes stored in the mobile radio's memory 60 as indicated by block 70.
  • the decision block 72 if the received SID code matches the SID code for the home system stored in the mobile radio's memory 60, the mobile radio 42 is in its home system 18 ( Figure 2) , and the mobile radio 42 then enters an idle state and monitors the control channel as indicated by block 74.
  • the mobile radio 42 is a roaming unit in the system serving the geographic area where the mobile radio 42 is presently located. If the user has configured the mobile radio 42 to notify him or her when roaming in a foreign system 30 ( Figure 2) by setting the new system notification feature flag (block 76) , the mobile radio 42 will then generate an audible and/or visible message as indicated by block 78. In a preferred embodiment of this invention, the mobile radio 42 will emit an audible "beep" and display a message such as "ROAMING IN SYSTEM XXXXX" where "XXXX' is the SID.
  • the appropriate code for the foreign system will then be automatically retrieved from the non-volatile memory 60 and transmitted to the base station 16 of the foreign system 30 (block 84) ; this is in contrast to the prior art where the user had to look up the proper code in a roaming guide if he didn't know the code for the foreign system and manually transmit it to the base station 16.
  • the mobile radio 42 enters the idle state and monitors the control channel as indicated by block 82.
  • the foreign system 30 will direct the mobile radio 42 to a voice channel containing audio signals as indicated by block 98.
  • the foreign system 30 responds by transmitting back an audio confirmation message to the mobile radio 42 as indicated by block 86. If the confirmation message flag was set by the user (block 88) , the confirmation message is further examined by the mobile radio 42 to determine whether the confirmation message indicates that the call-forwarding has been activated as indicated by decision block 92. If, on the other hand, the confirmation message flag was not set, the mobile radio 42 remains mute, terminates the call, and continues to the monitor the control channel as indicated by block 90.
  • the mobile radio 42 will generate an audio message as indicated by block 96. If, on the other hand, the foreign system 30 does not accept the call-forwarding activation code, the foreign system 30 will transmit an error message or a message which instructs the user to call the operator as indicated by block 94. The user will hear these audio messages from the foreign system 30 only if the user had previously configured the mobile radio 42 to play the audio message by setting the confirmation message flag; otherwise, the mobile radio 42 will remain mute (block 90) .
  • the mobile radio 42 After the mobile radio 42 has been on the voice channel for a predetermined time period, the mobile radio 42 terminates the call, enters an idle state, and monitors the control channel as indicated by block 100. While the present invention has been described with respect to its preferred embodiments, those skilled in the art will recognize that the present invention is not limited to the specific embodiments described and illustrated herein. Different embodiments and adaptations besides those shown herein and described as well as many variations, modifications and equivalent arrangements will now be apparent or will be reasonably suggested by the foregoing specification and drawings, without departing from the substance or scope of the invention.

Abstract

Radio mobile et procédé de fonctionnement pour activer automatiquement le renvoi des appels lorsque la fonction d'itinérance est présentée dans un système hors circonscription. La radio mobile reçoit un code d'identification du système et le compare à celui du système local de la radio mobile. Si le code d'identification reçu diffère de celui du système local, la radio recherche automatiquement un code approprié nécessaire pour permettre le renvoi automatique des appels et transmet le code reçu au système hors circonscription.
PCT/US1996/020001 1995-12-21 1996-12-19 Renvoi automatique des appels dans un radiotelephone mobile WO1997024006A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU14218/97A AU1421897A (en) 1995-12-21 1996-12-19 Automatic call-forwarding in a mobile radiotelephone

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US57635095A 1995-12-21 1995-12-21
US08/576,350 1995-12-21

Publications (1)

Publication Number Publication Date
WO1997024006A1 true WO1997024006A1 (fr) 1997-07-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/020001 WO1997024006A1 (fr) 1995-12-21 1996-12-19 Renvoi automatique des appels dans un radiotelephone mobile

Country Status (2)

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AU (1) AU1421897A (fr)
WO (1) WO1997024006A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002089510A1 (fr) * 2001-04-30 2002-11-07 Cellular Roaming Alliance Pty Ltd Renvoi selectif d'appels

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4901340A (en) * 1988-09-19 1990-02-13 Gte Mobilnet Incorporated System for the extended provision of cellular mobile radiotelephone service
US5142654A (en) * 1990-08-09 1992-08-25 Appex Corporation Cellular telephone system and method for dynamically switching between call routing options
EP0622928A1 (fr) * 1993-02-10 1994-11-02 Telefonaktiebolaget Lm Ericsson Procédé de signalisation d'un système de télécommunication
US5454027A (en) * 1992-01-27 1995-09-26 Hm Holding Corporation Phantom mobile identification number method and apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4901340A (en) * 1988-09-19 1990-02-13 Gte Mobilnet Incorporated System for the extended provision of cellular mobile radiotelephone service
US5142654A (en) * 1990-08-09 1992-08-25 Appex Corporation Cellular telephone system and method for dynamically switching between call routing options
US5454027A (en) * 1992-01-27 1995-09-26 Hm Holding Corporation Phantom mobile identification number method and apparatus
EP0622928A1 (fr) * 1993-02-10 1994-11-02 Telefonaktiebolaget Lm Ericsson Procédé de signalisation d'un système de télécommunication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002089510A1 (fr) * 2001-04-30 2002-11-07 Cellular Roaming Alliance Pty Ltd Renvoi selectif d'appels

Also Published As

Publication number Publication date
AU1421897A (en) 1997-07-17

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