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WO1996009732A2 - Systeme telephonique sans fil, station de base et combine utilises dans ce systeme - Google Patents

Systeme telephonique sans fil, station de base et combine utilises dans ce systeme Download PDF

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Publication number
WO1996009732A2
WO1996009732A2 PCT/IB1995/000757 IB9500757W WO9609732A2 WO 1996009732 A2 WO1996009732 A2 WO 1996009732A2 IB 9500757 W IB9500757 W IB 9500757W WO 9609732 A2 WO9609732 A2 WO 9609732A2
Authority
WO
WIPO (PCT)
Prior art keywords
base station
handset
subscriber
paging
bsl
Prior art date
Application number
PCT/IB1995/000757
Other languages
English (en)
Other versions
WO1996009732A3 (fr
Inventor
Peter Hirth
Original Assignee
Philips Electronics N.V.
Philips Norden Ab
Philips Patentverwaltung Gmbh
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 Philips Electronics N.V., Philips Norden Ab, Philips Patentverwaltung Gmbh filed Critical Philips Electronics N.V.
Priority to JP8510727A priority Critical patent/JPH09505968A/ja
Priority to KR1019960702671A priority patent/KR960706270A/ko
Priority to EP95929201A priority patent/EP0730809A1/fr
Publication of WO1996009732A2 publication Critical patent/WO1996009732A2/fr
Publication of WO1996009732A3 publication Critical patent/WO1996009732A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/16—WPBX [Wireless Private Branch Exchange]

Definitions

  • a cordless telephony system and a base station and a handset in such a system
  • the present invention relates to a cordless telephony system comprising at least one base station for communicating with at least one handset, which system uses an infrastructure of a wide area paging network for initiating servicing of incoming calls to handsets.
  • a handset and a base station can simply be a wireless local loop replacement of a plain old telephone in a switched telephone network, or the base station can be a wireless extension of a private automatic branch exchange, or the base station can be a Telepoint radio station which is connected to the switched telephone network.
  • a number of base stations, covering relatively small areas can form a business network. With a system like a DECT (Digital European Cordless Telecommunications) system, even a handover of a call between cells covered by base stations can be done.
  • DECT Digital European Cordless Telecommunications
  • the present invention further relates to a base station and to a handset for use in such a system.
  • a known service in a cordless telephony system in which a base station is installed in public places by a Public Telecommunications Operator is a so-called Telepoint service, enabling any subscriber to the Telepoint service to gain access to the public switched telephone network.
  • the base station itself has a limited coverage range, a few hundred meters for instance.
  • Such a Telepoint service, and further a cordless business system, and a seamless handover process are described in the handbook "Cordless Telecommunications in Europe", W.H. Tuttlebee, Springer-Verlag, 1990, pp. 91-101.
  • a Telepoint cordless telephone system in which a Telepoint base station is connected to an analog or to a digital telephone line, charging can be done via a telephone card from which call units are deduced when calling, via a credit card and an authentication procedure, or the like, supplied by the Network operator.
  • a problem with Telepoint systems is that usually only outgoing calls can be made by a cordless handset's subscriber.
  • the European Patent Application EP 0 212 761 gives a solution to this problem.
  • EP 0 212 761 a mobile communications system is described which is a combined cordless telephony and wide area paging system, the communications system allowing roaming of handsets over a large area covered by the wide area paging system.
  • a wide area paging system typically operates with 200 km cells in the VHF band (Very High Frequency).
  • the handsets have a built-in message pager to accommodate incoming calls to a handset, when the handset is in-range of a base station, which is not dedicated to the handset.
  • a simulcast paging system transmits a paging message to the message pager in the handset, the paging message comprising a calling subscriber's number and a called subscriber's number.
  • the handset receiving and decoding the paging message searches for the nearest in-range base station, either automatically, on the basis of the decoded calling subscriber's number, or after the called subscriber has keyed-in the calling subscriber's number on a dialling keyboard on an alert through the paging message.
  • a base station has been found, and a radio channel is available, a usual call set-up procedure is initiated as is applied for outgoing calls from the handset for which the incoming call is intended.
  • a more complicated procedure is carried out. First, the calling handset locks to a base station, and dials the called handset.
  • the paging server transmits a paging message to the called handset, the message including an ID-code (Identification Code) of the base station to which the calling handset is locked. Thereafter, the same procedure is followed as applied for a calling fixed network subscriber.
  • the base stations in this known system are attached to mobiles of a cellular mobile radio communications system, thus allowing roaming during a call.
  • no standard cordless telephone handsets, having only a cordless telephone transceiver can be applied, because the handsets in EP 0 212 761 require a paging receiver in addition to the cordless telephone transceiver. Furthermore, such a paging receiver increases the costs of a cordless telephone handset.
  • the cordless telephony system is characterised in that a base station is coupled to a paging receiver for receiving paging messages from a paging server coupled to a switched telephone network, which messages comprise an incoming call subscriber's number, and in that the base station and/or an handset to which an incoming call is to be forwarded comprise call set-up means for setting up the incoming call on the basis of the incoming call subscriber's number. It is achieved that a smaller number of paging receivers are required, i.e. only in base stations such as in Telepoint base stations or in base stations which are coupled to PABXs (Private Automatic Branch Exchanges).
  • PABXs Primary Automatic Branch Exchanges
  • the call charging can be done as follows.
  • the incoming call is charged by the calling party if not free of charge (a free calling number).
  • the outgoing call (or recall) is normally charged by the called party by the following procedures.
  • the bill is directly booked from a telephone card in the mobile.
  • the billing pulses from the PSTN are detected in the base station and are translated to a charging amount booked from the telephone card.
  • the telephone card is provided by the network provider.
  • the bill is booked from a credit amount stored in the mobile.
  • the credit amount is loaded from a credit card provider by a separate call for credit.
  • the access procedures to the host of the credit card provider is provided by the base. Or, a normal credit card is used.
  • the credit card check is part of the locking procedure to the base.
  • the bill will be charged after finishing the call by transmitting the charging information from the base to the host of the service provider. If the base establishes a recall automatically, the recall should be charged by the calling party because the called party cannot decide whether he will answer the call or not. This is only possible if the calling party is registered at the apging server and the active base will transfer the charging amount to the server while releasing the call.
  • the base station comprises a transmitter which is arranged for transmitting a received paging message to the handset, when the handset is locked to the base station, and the set-up means are comprised in the handset so as to set-up an outgoing call to an incoming call subscriber on the basis of the incoming call subscriber's number. It is achieved that the handset transforms an incoming call to an outgoing call.
  • the call set-up means are comprised in the base station so as to set-up an incoming call connection to the incoming call subscriber
  • the base station comprises a transmitter which is arranged for transmitting a call set-up paging message to the handset for setting up a wireless connection to the handset so as to complete the incoming call set-up. It is achieved that first a connection is made from the base station to the calling fixed network subscriber so that the calling subscriber can be alerted that a connection to the called subscriber is being set-up. This is done because the total connection time could exceed a time period that is felt unnatural by the calling subscriber so that the calling subscribed might disconnect.
  • the system is a DECT system combined with a message pager system such as a POCSAG (Post Office Code Standardisation Advisory Group) system, or the like.
  • the DECT system itself can be a micro-cellular system supporting handovers, as described on pp. 92-93, and p. 274 of said handbook of Tuttlebee, for instance.
  • the base station may comprise storage means for storing incoming paging messages, and may comprise a modem for automatic host connection for charging and authetification.
  • the handset may comprise storage means for storing paging messages if a call is not answered immediately. The paging messages, namely, are repeated if not answered or the handset gets a message while waiting only and can get the necessary information by an enquiry procedure.
  • Fig. 1 schematically shows a cordless telephony system according to the present invention
  • Fig. 2 shows a base station in a cordless telephony system according to the present invention
  • Fig. 3 shows a handset in a cordless telephony system according to the present invention
  • Fig. 4 shows a frame structure in a cordless telephony system according to the present invention
  • Fig. 5 shows a paging message in a cordless telephony system according to the present invention
  • Fig. 6 shows a flowchart for a base station procedure in a cordless telephony system according to the present invention.
  • Fig. 1 schematically shows a cordless telephony system 1 according to the present invention comprising base stations BSl and BS2 which are connected to a switched telephone network like a public switched telephone network PSTN, and base stations BS3 and BS4 which are coupled to the network PSTN via a private automatic branch exchange PABX.
  • the switched network can either be analog as the shown network PSTN or can be digital such as an ISDN (Integrated Services Digital Network).
  • the network PSTN can also be a private network.
  • the cordless telephony system 1 further comprises handsets HSl, HS2, and HS3.
  • the cordless telephony system can be an analog system, but preferably is a digital system such as a DECT system.
  • the cordless telephony system 1 uses an infrastructure of a simulcast wide area paging network comprising paging transmitters PT1, PT2, and PT3, and a paging server PS, the paging transmitters PT1, PT2, and PT3 covering large cells Cl, C2, and C3, respectively, and the cell having a diameter of 200 km, for instance.
  • a wide area paging network supporting a Standard like the POCSAG Standard, is well-known per se, and is not described in detail here. Further shown in Fig. 1 is a fixed network subscriber's telephone Tl.
  • the base stations BSl and BS2 support a public Telepoint service such as described in said handbook of Tuttlebee, the base stations BSl and BS2 not being dedicated to a particular handset.
  • the present invention concerns servicing of incoming calls to a handset coupled to a Telepoint servicing base station or an otherwise non-dedicated base station, such as servicing an incoming call from the fixed network subscriber's telephone Tl or from the handset HS3, when locked to one of the shown base stations BS3 and BS4 of the O business system formed by the exchange PABX and the base stations BS3 and BS4, to the handset HSl, when locked to the base station BSl.
  • the present invention thus supplies a simple replacement for public call-boxes inter alia, which can be installed easily.
  • Fig. 2 shows the base station BSl in the cordless telephony system 1 according to the present invention.
  • the base station BSl is a non-dedicated DECT base station supporting a Telepoint or a Telepoint like service.
  • the base station BSl comprises a cordless telephone CT as shown above a dashed line dl and a paging receiver PR as shown below the dashed line dl.
  • the cordless telephone CT is coupled to the paging receiver PR.
  • the cordless telephone CT and the paging receiver PR preferably are comprised in the same housing.
  • the cordless telephone CT comprises a transceiver 10 which is controlled by a burst mode controller 11, and further a line interface 12 for coupling the base station to the network PSTN, and a microcontroller 13 for controlling the transceiver 10, the burst mode controller 11, and the line interface 12.
  • the burst mode controller 11 can be an IC (Integrated Circuit) of type PCD5041 performing the so-called DECT Physical Layer and the DECT MAC (Medium Access Control) Layer time critical functions inter alia.
  • IC Integrated Circuit
  • DECT MAC Medium Access Control
  • the microcontroller 13 is a programmed device comprising ROM and RAM (not shown), implementing the functionality of a DECT Standard such as to locking to a handset, setting up a call and so on.
  • a DECT Standard such as to locking to a handset, setting up a call and so on.
  • the microcontroller 13 is further coupled to a locked-list memory 14 in which subscriber information of handset's subscribers, such as a subscriber's number, are stored of handsets which are locked to the base station BSl.
  • a DECT base station always has at least one active carrier to which a handset can lock when in idle mode.
  • the paging receiver PR comprises a receiver front-end 15 and a paging message decoder 16.
  • the decoder 16 is coupled to the microcontroller 13 in the cordless telephone CT.
  • the cordless telephone CT has a receiving/transmitting antenna Al
  • the paging receiver PR has a receiving antenna Fig. 3 shows the handset HSl in the cordless telephony system 1 according to the present invention.
  • the handset HSl is a DECT handset and is locked to the Telepoint base station BSl, whereby the locked-list memory 14 in the base station BSl contains the handset's subscriber number.
  • the handset HSl comprises a zero-IF (Interme ⁇ diate Frequency) receiver 20 which is coupled to a receive/transmit switch 21 at input side, and to a burst mode controller 22 at output side.
  • the receive transmit switch 21 is coupled to a receiving transmitting antenna A3.
  • the burst mode controller 22 is further coupled to an ADPCM (Adaptive Differential Pulse Code Modulator) Codec 23 for compressing/expanding digitised speech.
  • the handset HSl further comprises a transmitter 24 which is coupled to the burst mode controller 22 at input side, and to the receive/transmit switch 21 at output side.
  • a voltage controlled oscillator in the handset HSl is coupled to the zero-LF receiver 20, and to the transmitter 24 via a synthesizer 26.
  • a prescaler in the handset HSl is coupled to the oscillator 25 and to the synthesizer 26.
  • the handset HSl comprises a microcontroller 27 connected to a stored program ROM 28 and a RAM 29, which microcontroller 27 is coupled to the burst mode controller 22 and to the ADPCM Codec 23.
  • the microcontroller 27 has analog and digital I/O (Input/Output) interfaces (not shown in detail) for coupling it to a keyboard 30 for keying-in dialling information inter alia, and a display 31 for displaying message inter alia.
  • the display 31 display the fixed network subscriber's number as transparently transmitted by the base station BSl, for allowing an incoming call to be answered by dialling the fixed network subscriber on the basis of its displayed subscriber's number.
  • the transparently transmitted fixed network subscriber's number is automatically stored into a usually present dialling memory (not shown) so as to allow the handset HSl to automatically answer the incoming call.
  • the arrow 32 indicated digital speech in two directions.
  • FIG. 4 shows a frame structure FR in the cordless telephony system according to the present invention, which is a DECT frame structure FR having twelve time slots from a base station to handsets, indicated with BS to HS, and having twelve time slots from handsets to the base station.
  • Fig. 4 it is assumed that the handset HSl is locked to the base station BSl, and that, when in call mode, time slots TS4 and TS16 convey traffic from the base station BSl to the handset HSl, and traffic from the handset HSl to the base station BSl, respectively.
  • FIG. 5 shows a POCSAG paging message PM in the cordless telephony system 1 according to the present invention, comprising synchronisation information SY, as usual, an address AS, a separation sign SE, and data DT.
  • the fixed network subscriber which is the calling subscriber with subscriber number SUBA and which operates the telephone Tl, dials the paging server PS and supplies a called subscriber's number SUBB, which is the handset's HSl subscriber's number, to the paging server PS.
  • the call is an incoming one.
  • the paging server has pre-dial number 190.
  • the called subscriber's number SUBB forms the paging address AS
  • the calling subscriber's number SUBA as supplied by the paging server PS, form a part of the data DT, which may comprise other free-format text information TXT.
  • the data DT, the calling subscriber's number SUBA and the text TXT thus are transparent information for a receiving party of this information, in the present invention the paging receiver PR in the base station BSl.
  • the decoder 16 in the paging receiver PR decodes the paging message PM.
  • the decoder 16 supplies both the calling subscriber's number SUBA and the called subscriber's number SUBB to the microcontroller 13, together with any further free-format text such as the text TXT.
  • the microcontroller matches the called subscriber's number SUBB with its locked-list.
  • the base station BSl transmits the transparent information in the paging message PM, i.e.
  • the called subscriber's handset HSl either automatically transforms the incoming call to an outgoing call via its dialling memory, or alerts the called subscriber via the display 31 so that the called subscriber can key-in the calling subscriber's number SUBA.
  • a DECT cordless telephony system such a paging by the base station BSl, i.e.
  • Fig. 6 shows a flowchart for a base station procedure in the cordless telephony system 1 according to the present invention for handling the paging message PM received from the paging server PS.
  • the procedure starts from idle mode as indicated in block 40.
  • an incoming call is received from a fixed network subscriber.
  • it is tested whether or not the called handset's subscriber number is in the locked-list memory 14. If so, in block 43 the base station transmits the CISS message as described with respect to Fig. 5 to the called handset's subscriber.
  • the base station BSl first dials the fixed network's subscriber operating the telephone Tl. When a connection is made to this subscriber having the subscriber's number SUBA, this subscriber gets an auditive message like "connection is being made, please, hold the line" or "the requested subscriber is being called”. Then, the base station BSl pages the called subscriber so that the connection can be completed.

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

Abstract

Un système combiné de téléphonie sans fil (1) et de recherche de personnes (PS, PT1, PT2, PT3) sur de longues distances permet à des abonnés (HS1, HS2, HS3) de postes téléphoniques sans fil de se déplacer sur de longues distances par rapport aux appels entrants d'un abonné fixe (SUBA; T1) du réseau. Dans les systèmes connus, les combinés (HS1, HS2, HS3) comprennent un dispositif de recherche de personnes sur de longues distances capable de recevoir des messages de recherche de personnes d'un serveur de recherche de personnes qui contient le numéro d'un abonné (SUBA) du réseau fixe qui fait un appel. Les combinés (HS1) transforment un appel entrant d'un abonné du réseau fixe en un appel sortant. Dans de tels systèmes, on ne peut pas utiliser des combinés standards de téléphonie sans fil. En outre, les combinés qui permettent d'assurer ce service sont plus coûteux que les combinés standards. Il est aussi difficile de facturer les appels. L'invention concerne un système amélioré dans lequel des stations de base non dédiées (CT; BS1, BS2) comprennent un récepteur de recherche de personnes (PR) qui reçoit des messages de recherche de personnes (PM) d'un serveur de recherche de personnes (PS). Les stations de base (BS1, BS2) recherchent les abonnés (SUBB) des combinés appelés lorsque ceux-ci sont reliés à la station de base (BS1). L'abonné (SUBB) du combiné appelé ou le combiné (HS1) peuvent ensuite compléter la liaison avec l'abonné (SUBA) du réseau fixe. Ce système (1), qui est relativement bon marché et facile à installer, peut être utilisé pour remplacer des systèmes publics d'appel par haut-parleurs.
PCT/IB1995/000757 1994-09-22 1995-09-13 Systeme telephonique sans fil, station de base et combine utilises dans ce systeme WO1996009732A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP8510727A JPH09505968A (ja) 1994-09-22 1995-09-13 コードレス電話系並びに該系用基地局および携帯電話局
KR1019960702671A KR960706270A (ko) 1994-09-22 1995-09-13 무선 전화 시스템 및 그 시스템에서의 기지국과 송수화기(A cordless telephony system, and a base station and a handset in such a system)
EP95929201A EP0730809A1 (fr) 1994-09-22 1995-09-13 Systeme telephonique sans fil, station de base et combine utilises dans ce systeme

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP94202717.8 1994-09-22
EP94202717 1994-09-22

Publications (2)

Publication Number Publication Date
WO1996009732A2 true WO1996009732A2 (fr) 1996-03-28
WO1996009732A3 WO1996009732A3 (fr) 1996-05-30

Family

ID=8217214

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1995/000757 WO1996009732A2 (fr) 1994-09-22 1995-09-13 Systeme telephonique sans fil, station de base et combine utilises dans ce systeme

Country Status (7)

Country Link
EP (1) EP0730809A1 (fr)
JP (1) JPH09505968A (fr)
KR (1) KR960706270A (fr)
CN (1) CN1137852A (fr)
CZ (1) CZ144496A3 (fr)
TW (1) TW411674B (fr)
WO (1) WO1996009732A2 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1209566B (it) * 1984-07-06 1989-08-30 Face Standard Ind Sistema e procedura per identificare la posizione di un utente radiomobile nell'ambito di una vasta superficie geografica.
GB8419003D0 (en) * 1984-07-25 1984-08-30 Racal Res Ltd Portable telephones
GB2179823A (en) * 1985-08-28 1987-03-11 Philips Electronic Associated Communications system
JPH0771334B2 (ja) * 1988-10-18 1995-07-31 日本電信電話株式会社 位置登録制御方式
JPH03175900A (ja) * 1989-12-05 1991-07-30 Matsushita Electric Ind Co Ltd 広域ページング・システム
AU633190B2 (en) * 1990-02-22 1993-01-21 Motorola, Inc. Method and system for establishing link with wireless telephone
JPH03274834A (ja) * 1990-03-26 1991-12-05 Nippon Telegr & Teleph Corp <Ntt> パーソナル通信方式
WO1992003006A1 (fr) * 1990-08-03 1992-02-20 Motorola, Inc. Systeme de communication par telephone sans fil a deux voies
SG43212A1 (en) * 1991-12-12 1997-10-17 Nec Corp Personal mobile communications system having central station for paging mobile uers via base stations
US5307399A (en) * 1992-03-06 1994-04-26 Glenayre Electronics, Inc. Paging system that allows caller/subscriber interconnection
US5450474A (en) * 1992-03-11 1995-09-12 U.S. Philips Corporation Network in which cordless phones are paged from a plurality of base stations that receive paging codes for the cordless phones via subscriber lines

Also Published As

Publication number Publication date
WO1996009732A3 (fr) 1996-05-30
KR960706270A (ko) 1996-11-08
TW411674B (en) 2000-11-11
EP0730809A1 (fr) 1996-09-11
CZ144496A3 (en) 1996-12-11
JPH09505968A (ja) 1997-06-10
CN1137852A (zh) 1996-12-11

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