EP1125467A1 - Procede et dispositif de localisation d'une station mobile - Google Patents

Procede et dispositif de localisation d'une station mobile

Info

Publication number
EP1125467A1
EP1125467A1 EP99971624A EP99971624A EP1125467A1 EP 1125467 A1 EP1125467 A1 EP 1125467A1 EP 99971624 A EP99971624 A EP 99971624A EP 99971624 A EP99971624 A EP 99971624A EP 1125467 A1 EP1125467 A1 EP 1125467A1
Authority
EP
European Patent Office
Prior art keywords
mobile station
mobile
identity code
guide unit
guide
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP99971624A
Other languages
German (de)
English (en)
Inventor
Markku Vimpari
Jari Kokkonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Oyj
Original Assignee
Nokia Mobile Phones Ltd
Nokia Oyj
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 Mobile Phones Ltd, Nokia Oyj filed Critical Nokia Mobile Phones Ltd
Publication of EP1125467A1 publication Critical patent/EP1125467A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/24—Accounting or billing

Definitions

  • the invention relates to a method and arrangement for locating a mobile station. By means of the invention it is observed whether the mobile station is located in a predetermined area.
  • the invention is advantageously applied for defining call tariffs, or for defining available services on the basis of the location of the mobile station in question.
  • the accuracy of the localisation methods belonging to the basic functions of cellular networks is not sufficient with respect to the above mentioned applications.
  • By means of roaming it is found out where the mobile phone is located at each particular moment - in which operator's network and in which location area. On the basis of paging, the location of the mobile station is found out more accurately, but only on the accuracy level of one cell.
  • the object of the invention is to eliminate some of the drawbacks of the prior art by creating a completely new solution, where the location of a mobile station within a determined area can be detected accurately, reliably and by means of fairly simple devices.
  • the basic idea of the invention is as follows: in the home and/or possibly in some other fixed place of residence, there is installed a transmitter which repeatedly transmits the identity code of said mobile station.
  • the transmission power is so low that the signal is detected for example within a range of a few tens of meters only.
  • the signal is formed so that it can be distinguished from other signals that are active within the same area.
  • a mobile station that detects its own identity code in the channel used by the transmitters sends a signal message to the mobile system. The message announces that the mobile station is "at home”.
  • the system advantageously uses this information so that at least for the mobile originated calls there is set a lower tariff than when the mobile station is outside the range of said transmitter (transmitters).
  • An advantage of the invention is that the location of the mobile station in a given place can be detected by means of an arrangement which does not cause technical problems in the network nor expenses connected thereto. Another advantage of the invention is that the required facility equipment is simple and thus economical in manufacturing/purchasing costs. Yet another advantage of the invention is that when the mobile station is located at home, all calls directed thereto can, when desired, be automatically transferred to the fixed wireline telephone. Moreover, it is an advantage of the invention that in a certain mode, it can be provided with a function common to all mobile stations, such as switching the phone off in an aeroplane.
  • the invention brings forth the advantage that there opens up a practical possibility to compete of customers who have a traditional fixed wireline telephone; from the the mobile station subscriber's point of view the advantage of the invention is that the operation costs of the mobile station are cut down due to cheaper home calls. Yet another advantage is that the cheaper home calls can be made without having to use the fixed wireline telephone.
  • the method according to the invention for locating a mobile station in which method the location of the mobile station within a predetermined home area is detected, and information of said location is sent to the mobile system, is characterised in that
  • the arrangement according to the invention for locating a mobile station comprising means for detecting whether the mobile station is located within a predetermined home area, and means for sending the detected information to the mobile system, is characterised in that
  • the means for detecting whether the mobile station is located within its home area comprise a guide unit installed in the home area and repeatedly transmitting the identity code of said mobile station, as well as in the mobile station reception circuits corresponding to the channel that the guide unit uses for transmission, and means for processing the signal from the guide unit,
  • the means for sending said detected information to the mobile system comprise in the mobile station a program for formulating a home message and a mobile message, and - the arrangement for locating the mobile station also comprises means for verifying the validity of said guide unit.
  • figure 1 illustrates the principle of the invention and an example of an arrangement according to it
  • figure 2 is a flow diagram illustrating an example of the operation of an arrangement according to figure 1,
  • figure 3 illustrates another example of the arrangement according to the invention
  • figure 4 is a signalling diagram illustrating an example of the arrangement according to figure 3,
  • figure 5 is a block diagram illustrating an example of the guide unit according to the invention.
  • figure 6 is a block diagram illustrating another example of the guide unit according to the invention.
  • figure 7 is a block diagram illustrating an example of a mobile station according to the invention.
  • Operational units are the guide unit 101, the mobile station 102 and the MSC, mobile switching centre 103.
  • the guide unit 101 includes a radio transmitter.
  • the guide unit is installed permanently in the premises 100, and it is realised so that the unit stops operating, if it is detached and moved.
  • the unit 101 repeatedly transmits the identity code of the mobile station 102, which code can be for instance the IMEI (International Mobile station Equipment Identity) of the mobile station.
  • the transmission power is so low that the field 110 of said radio transmitter extends in detectable form only to the premises 100 and to the immediate vicinity thereof.
  • the area where the mobile station identity code can be detected is in the specification and in the appended claims called the home area of said mobile station.
  • the "home area" can be the subscriber's home or summer cottage with surroundings, working place or some other defined area.
  • the channel on which the guide unit sends the mobile station identity code is in this specification and claims called guide channel, irrespective of the applied technology.
  • the mobile station 102 is first located in a place [1], where the field strength of the guide unit 101 is in practice zero. Then the mobile station is transferred to another place [2], where the field 110 of the guide unit is observed and the signal contained therein detected. Now the mobile station identifies its own identity code in the signal from the guide unit and transmits, by using the network signalling connection 120, to the mobile switching centre 103 a message that it is located in the home area. Thereafter the calls originated from the mobile station 102 are billed according to a tariff that is lower than before the mobile station entered the home area.
  • the mobile switching centre 103 maintains the lower tariff until the mobile station 102 indicates that it is located outside the range of the guide unit 101, or when the base station connection of the mobile station is interrupted. Lower tariffs can also be applied for incoming calls to the mobile station 102, so that the mobile switching centre 103 notifies that switching centre which has the information of the paying customer that the called mobile station is located in its home area.
  • FIG. 2 is a flow diagram of a method according to the invention.
  • the operating voltage of the mobile station is switched on.
  • the mobile station observes in idle mode the frequency division channel, i.e. the guide channel, reserved for transmitting the identity codes.
  • This channel is advantageously the first or last channel in the frequency area reserved for said mobile network, because these are normally left unused as traffic channels owing to possible interference.
  • the transmission powers in said channel are so low that there is no danger of interference.
  • the observation of the guide channel here means that the mobile station receiver is tuned to the channel and the detector output is observed. From the detector output, there is searched, in step 203, a signal to be synchronised with.
  • the identity code connected thereto is decoded in step 204.
  • Separate guide units meant for different mobile stations but using the same guide channel can be located fairly near to each other. In order to distinguish between the various identity codes, the guide signals must be further channelled in the guide channel. In theory, the same time division technique could be applied as in other frequency division channels of said digital network, but the system would become unreasonably complicated and expensive. It is, however, advantageous to apply in the guide units CDM (Code Division Multiplexing) or frequency hopping. In the latter case, the carrier wave frequency is arranged to fluctuate according to a sequence formed of the numbers of the identity code.
  • each bit of the identity code is represented by a given codeword, which is sent in identical or inverted order depending on whether said databit is one or zero.
  • the receiving mobile station processes the received signal, by means of correlation technique, into the datasignal proper, and thereafter compares the code contained therein to its own identity code in step 205. If the mobile station is not located in its home area, the correlator does not give the signal containing the information, at least not the identity code of said mobile station.
  • Code division multiplexing is suited to be applied in analog mobile networks, too.
  • the mobile station If the mobile station has detected its own identity code, it sends to the network a message to that effect in step 206.
  • the transfer can take place for example in the RACH (Random Access CHannel) or in the SACCH (Slow Associated Control Channel).
  • RACH Random Access CHannel
  • SACCH Slow Associated Control Channel
  • the centre program sets lower tariffs for said mobile station, step 207. In proportion, the discount is most remarkable when making local calls.
  • the mobile station announces on the display and possibly by sound signal that the tariffs are lowered. As long as the mobile station is located in its home area, it continues to observe the guide channel in step 208.
  • FIG. 3 illustrates another example of the arrangement according to the invention. It includes a guide unit 301, comprising an infrared transmitter/receiver, and a mobile station, likewise comprising an infrared transmitter/receiver.
  • the guide unit 301 is installed in the ceiling of the room 300 which serves as the place of residence of the subscriber 350 of the mobile station 302.
  • the unit 301 repeatedly transmits the identity code of the mobile station 302.
  • the person 350 has stepped in the room 300 and directed the infrared window of the mobile station 302 towards the guide unit 301.
  • the mobile station 302 identifies its own identity code and sends, by using the network messaging connection 320, notice to the mobile switching centre that it is located in its home area. On the basis of said notice, the mobile switching centre for instance lowers tariffs according to the description above.
  • FIG. 4 is a signalling diagram illustrating the operation of a system according to figure 3.
  • the guide unit transmits repeatedly the identity code of the mobile station belonging thereto.
  • the mobile station is located outside its home area, in other words outside the reach of the infrared signal of the guide unit.
  • the mobile station has been brought to its home area, and in the infrared message it identifies its own identity code. As a consequence, it transmits a home message to the network.
  • the centre transmits to the mobile station a random number per each individual case. Said random number is further sent by the mobile station to the guide unit via the infrared link.
  • the guide unit is provided with its own SIM module, which contains a secret identity number for verifying the validity of the unit.
  • the guide unit calculates, according to a given algorithm, a response number on the basis of said secret identity number and said random number, and it sends the obtained response number to the mobile station.
  • the mobile station further sends the response number to the mobile switching centre, which compares the received response number with the one that was earlier calculated in the centre. If the numbers match, the centre for example sets lower tariffs for said mobile station and sends a notice to that effect for the mobile station.
  • the mobile station reads the signal transmitted by its infrared receiver.
  • the mobile station has not within a predetermined period of time detected its own identity code, and it sends a mobile message to the centre.
  • the centre notifies that normal tariffs are applied again.
  • Figure 5 shows an example of the guide unit.
  • the guide unit 500 comprises a memory 510, a digital to analog converter 520, a transmitter unit 530, an antenna 531, a control unit 540, a small keyboard 541, a frequency unit 550 and an oscillator 551.
  • the memory 510 there are recorded recalculated bit patterns, which, when fed in the converter 520 at the right speed, produce the baseband analog signals I and Q confo ⁇ ning to the modulation mode used in said mobile network.
  • the converter 520 contains two separate DA converters, one for the I signal and the other for the Q signal.
  • the signals I and Q conform to the modulation GMSK (Gaussian Minimum Shift Keying).
  • GMSK Gausian Minimum Shift Keying
  • the signals I and Q affect directly for instance in the quadrature carrier waves, or first in the quadrature sine waves with the intermediate frequency. In both cases, there is formed a summed radio frequency signal which is then amplified in the radio transmitter proper and fed to the antenna 531.
  • the picking of the numbers from the memory 510 takes place so that the control unit 540 sends, at regular intervals, successive addresses and a number control signal to the memory.
  • Each memory location contains two numbers, the first of which corresponds to the momentary state of the I signal, and the second corresponds to the momentary state of the Q signal.
  • the parallel numbers are fed to the converter 520, as was explained above.
  • the control unit 540 also sends a timing signal to the converter 520 and a frequency setting signal to the frequency unit 550.
  • the guide unit is provided with a small keyboard 541, for example.
  • the frequency unit 550 creates the waves with the necessary frequency advantageously by applying phase lock technique, by utilising the basic frequency wave transmitted by the oscillator 551.
  • FIG. 6 illustrates an example of an guide unit applying frequency hopping.
  • the guide unit 600 includes a control unit 610, a frequency unit 620, and oscillator 621, a transmission unit 630 and an antenna 631.
  • the control unit there is recorded the individual code id of the mobile station, which is for instance suitably shortened as IMEI.
  • the control unit 610 sends, as a repeated sequence, the numbers of the code id to the frequency unit 620.
  • This forms, by using the basic-frequency wave transmitted by the oscillator 621, a radio-frequency signal with a fluctuating or "hopping" frequency in correspondence to the numbers obtained from the control unit.
  • the frequency fluctuation range falls outside the frequency bands used by mobile networks, in some free frequency area.
  • FIG. 7 is a block diagram showing an example of a mobile station according to the invention.
  • the mobile station 700 comprises a SIM card 710 for storing user data.
  • the transmission apparatus comprises, in this order, a microphone 731, a speech coder 732, a channel processor 733 and a transmitter unit 734.
  • the speech coder 732 the voice signal is digitised and compressed.
  • the channel processor 733 the speech or data signal to be transmitted is channel coded, the bit sequences are interleaved, a possible encryption takes place and the bursts to be located in the system time slots are created.
  • the receiver apparatus includes, in this order, a receiver unit 744, a receiver side channel processing apparatus 743, a speech decoder 742 and a earphone 741.
  • the receiver unit 744 there is carried out, among others, tuning to the reception channel and demodulation.
  • the processing apparatus 743 there are carried out inverted operations as compared to the operations of the channel processor 733, and in the speech decoder 742 as compared to the operations of the speech coder 732.
  • the transmission and reception arrangements have the antenna 750 and the duplex filter 751 coupled thereto.
  • the mobile station 700 In order to operate the mobile station 700, it is provided with a keyboard 761 and a display 762.
  • the mobile station includes a control unit 720. Said control unit feeds the message and other data signals to the channel processor 733, as well as receives signals of the same type from the channel processing apparatus 743. The intercommunication of the control unit with the rest of the units takes place via the path 780.
  • the control unit 720 includes a memory 721, where there is stored the software PR required by the mobile phone operations according to the invention.
  • the software PR at least creates the home and mobile messages to be sent in the network.
  • the comparison of the identity code sent by the guide unit can be carried out by means of the PR software, or then by the device itself, in the control unit 720. If the mobile station verifies the validity of the guide unit, the software PR comprises the programme part of the verification process.
  • Figure 7 does not include some of the additions required by a few preferred embodiments in mobile station.
  • the use of code division multiplexing does not require additions in the hardware. If the guide unit operates according to the frequency hopping principle, there are needed, in the mobile station, receiver devices which can be tuned to the frequency range used in the frequency hopping, and which send a code corresponding to the hopping sequence. If infrared technique is used in the guide unit, naturally the mobile station also must be provided with an infrared unit with transmitter and receiver.
  • the identity code can also be transmitted by means of a fairly wide conductor loop.
  • the validity of the guide unit applying radio frequencies can also be verified according to the procedure described in figure 4.
  • the validity of the guide unit of any possible type can also be verified in a simpler fashion, directly in the mobile station, by using the secret identity code in the calculation.
  • the mobile station can check its location only when making a call and possibly when receiving one. If the checking proves the device to be in the home area, the mobile switching centre can for instance set lower tariffs for the duration of said call, and cancel the discount when the call is terminated.
  • the inventive idea can be applied in many different ways within the scope of the independent patent claims.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un dispositif de localisation d'une station mobile, permettant de détecter si une station mobile se trouve dans une zone prédéterminée. Lesdits procédé et dispositif sont conçus sur l'idée de base suivante. Un émetteur (101) émettant de manière répétée le code d'identité de ladite station mobile, est installé à domicile et/ou dans un autre lieu de résidence permanent. La puissance d'émission est si faible que le signal ne peut être détecté que dans un rayon de quelques dizaines de mètres, par exemple. Le signal est formé de sorte qu'il puisse être distingué des autres signaux éventuels actifs dans la même zone. Une station mobile qui détecte son propre code d'identité dans la voie utilisée par l'émetteur, envoie un message de signalisation au système mobile. Le message signale que la station mobile se trouve dans la zone prédéterminée. Le système (103) utilise avantageusement ces informations de sorte qu'au moins pour les connexions provenant de ladite station mobile, un tarif inférieur à celui appliqué si la station mobile était hors de portée du ou desdits émetteurs soit appliqué.
EP99971624A 1998-10-30 1999-10-29 Procede et dispositif de localisation d'une station mobile Withdrawn EP1125467A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI982365A FI982365A (fi) 1998-10-30 1998-10-30 Menetelmä ja järjestely matkaviestimen paikantamiseksi
FI982365 1998-10-30
PCT/FI1999/000908 WO2000027152A1 (fr) 1998-10-30 1999-10-29 Procede et dispositif de localisation d'une station mobile

Publications (1)

Publication Number Publication Date
EP1125467A1 true EP1125467A1 (fr) 2001-08-22

Family

ID=8552823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99971624A Withdrawn EP1125467A1 (fr) 1998-10-30 1999-10-29 Procede et dispositif de localisation d'une station mobile

Country Status (4)

Country Link
EP (1) EP1125467A1 (fr)
AU (1) AU1162700A (fr)
FI (1) FI982365A (fr)
WO (1) WO2000027152A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE10061721A1 (de) 2000-12-12 2002-06-27 Philips Corp Intellectual Pty Verfahren zum Betrieb eines Telekommunikationssystems
FR2823938B1 (fr) * 2001-04-18 2003-09-05 Inventio Ag Ensemble de telephonie mobile, balise, et procede de detection de proximite entre un terminal et une balise
DE10133650A1 (de) * 2001-07-11 2003-01-30 Siemens Ag Verfahren zum Lokalisieren einer Mobilstation, Lokalisierbare Mobilstation, Hilfsmittel zum Lokalisieren von Mobilstationen und Basisstation für ein Mobilfunknetz
EP1841255A1 (fr) 2006-03-28 2007-10-03 Carlos Alberto Pérez Lafuente Procédé et système de surveillance de la présence d'une station mobile dans une zone spéciale
FR2902270A1 (fr) * 2006-06-13 2007-12-14 Ialto Sarl Procede de localisation spatiale d'un moyen de communication mobile dans un reseau de communication, ainsi qu'un systeme de communication de donnees de mise en oeuvre
GB2443007B (en) * 2006-10-19 2010-10-20 Vodafone Plc Locating mobile terminals
GB0704838D0 (en) * 2007-03-13 2007-04-18 Hutchison Whampoa Three G Ip An Alternative way to implement home zone application

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US5101500A (en) * 1988-05-30 1992-03-31 Kabushiki Kaisha Toshiba Radio telecommunication apparatus
JP3104878B2 (ja) * 1990-01-31 2000-10-30 株式会社東芝 無線通信装置
US5444765A (en) * 1992-03-23 1995-08-22 Kabushiki Kaisha Toshiba Radio telephone apparatus having a service area confirmation
GB9223586D0 (en) * 1992-11-11 1992-12-23 Vodafone Ltd Radio telecommunication systems and methods
FR2711033B1 (fr) * 1993-10-05 1996-06-28 Cofira Sa Système de radiocommunication cellulaire permettant l'accès à un service fonction de la localisation, module de prélèvement et module de fourniture d'un service personnalisé correspondants.
US5740538A (en) * 1996-01-05 1998-04-14 Lucent Technologies, Inc. System and method for identifying the location of a wireless terminal
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FI110984B (fi) * 1997-08-22 2003-04-30 Nokia Corp Menetelmä kotialueen havaitsemiseksi matkaviestimessä ja matkaviestin
FI980654A (fi) * 1998-03-23 1999-09-24 Nokia Networks Oy Menetelmä ja järjestelmä sijainnista riippuvien palvelujen käyttämisek si solukkoradiojärjestelmässä

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Also Published As

Publication number Publication date
FI982365A0 (fi) 1998-10-30
FI982365A (fi) 2000-05-01
WO2000027152A1 (fr) 2000-05-11
AU1162700A (en) 2000-05-22

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