WO1991018484A1 - INSTALLATION PERMETTANT LA CONNEXION DE TELEPHONES SANS FIl AU CENTRAL TELEPHONIQUE D'UN ABONNE - Google Patents

INSTALLATION PERMETTANT LA CONNEXION DE TELEPHONES SANS FIl AU CENTRAL TELEPHONIQUE D'UN ABONNE Download PDF

Info

Publication number
WO1991018484A1
WO1991018484A1 PCT/SE1991/000326 SE9100326W WO9118484A1 WO 1991018484 A1 WO1991018484 A1 WO 1991018484A1 SE 9100326 W SE9100326 W SE 9100326W WO 9118484 A1 WO9118484 A1 WO 9118484A1
Authority
WO
WIPO (PCT)
Prior art keywords
exchange
subscriber
handset
call
base station
Prior art date
Application number
PCT/SE1991/000326
Other languages
English (en)
Inventor
Ragnar WIKSTRÖM
Original Assignee
Tateco Ab
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 Tateco Ab filed Critical Tateco Ab
Publication of WO1991018484A1 publication Critical patent/WO1991018484A1/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

  • the subject invention concerns an installation for connection of cordless telephone sets to a subscriber's telephone exchange in order thus to create a cordless telephone system.
  • This installation comprises base stations consisting of short range radio transmitters and radio receivers which are stationary units, and portable handsets, likewise consisting of short range radio transmitters and radio receivers.
  • the base stations are wire-connected to the subscriber's telephone exchange.
  • Installations of this kind are previously known from SE 8502319-0. They are intended to be used within a comparatively small area, such as within the precinct of a hospital, a factory or an office building and the operative range of the radio transmitters in the base stations as well as in the handsets is very restricted, amounting to only some 20-40 meters.
  • the prior-art installation comprises a radio exchange the purpose of which is to establish connection between the subscriber's exchange and the base station that detects the best quality signal emitted from a selected, wanted handset.
  • the signal from the transmitting base station to the handset becomes too weak for the call to be continued.
  • the radio exchange transfers the call to the one of several adjacent base stations that has the strongest signal. Thanks to the function of the radio exchange the limitation that would otherwise have afflicted the radio transmitters having a short operative range, is eliminated.
  • One disadvantage found in an installation of the kind described is, however, the complicated nature of the radio exchange.
  • the subject invention provides an installation wherein the wide range of possibilities inherent in a modern subscriber's telephone exchange to establish connection is utilized, whereby it becomes possible to construct the rest of the installation in more simple manner than has hitherto been possible.
  • a subscriber's exchange 1 in accordance with the embodiment illustrated in the drawing, is in wire communication with eight base stations 2a, 2b, 3a, 3b, 4a, 4b and 5a, 5b. These are stationary units, each one of which is capable of operating on one of several available speech channels at a time.
  • the base stations 2a-5b form radio cells 6, 7, 8 and 9, respectively, corresponding to the range of coverage of the base stations 2a-5b.
  • the number of base stations for each cell 6-9 may be chosen according to need. For the sake of simplicity, only one handset 10, 11, 12 and 13, respectively, is shown in each one of the radio cells 6-9.
  • the installation also comprises an interconnection unit 14 which is in wire communication with the subscriber's exchange 1, and a control unit 15 in the form of a computer of uncomplicated structure, the function of which is to coordinate the activities of the base stations 2a-5b.
  • an incoming call is received from an external or internal telephone 16 and that the selected subscriber's handset is handset 12.
  • This subscriber is temporarily transferred from the exchange to the interconnection unit 14 and the incoming call thus is transferred to the cordless system.
  • This function is one commonly existing in subscriber's telephone exchanges, particularly when they are interconnected with paging systems.
  • the information on the identity of the wanted handset is transferred to the control unit 15.
  • the latter orders one base station 2a-5b in each cell 6-9 to search for the wanted subscriber.
  • base station 4a or 4b will find the handset 12 since the latter is located within radio cell 8.
  • Base station 4a informs the control unit 15 that it has found the wanted sub ⁇ scriber and is allowed to connect the call since this station is the one that at that instance has the strongest signal.
  • the base station 4a then puts a (cordless) call onto the handset 12.
  • the base station 4a emits a coded signal representing a "meet-me"- answer to the exchange 1.
  • the latter then interconnects the telephone 16 and the handset 12.
  • Another example of utilizing the exchange 1 is to make use of its ability to "register" calls. Assuming, for instance, that while a call is in progress the subscriber, carrying the handset 12, moves outside the area of radio cell 8 and into that of radio cell 9. The strength of the signal between the handset 12 and the base station 4a then will be weakened.
  • the base station informs the control unit 15 accordingly, with the result that the unit emits another search order in the manner described in the aforegoing to one base station 2a-5b in every one of cells 6-9. Either base station 5a or 5b is now able to establish contact with the handset 12.
  • the control unit 15 therefore orders base station 4a to "transfer" the call to e.g. base station 5a and instructs the latter station to take over the call.
  • Base station 5a then establishes call communication with the handset 12.
  • Base station 4a then supplies the exchange 1 with a coded signal of call transfer to base station 5a and thereafter interrupts communication with the exchange 1 as well as with the handset 12.
  • the exchange 1 emits a call to base station 5a.
  • a switch-over is effected in the exchange 1, establishing call communication between the telephone 16 and the base station 5a, whereupon communication between the telephone 16 and the handset 12 is re-established.
  • a call switch-over, or "hand over” can in the manner described be made for each handset 10-13 that is connected to the system as soon as the strength of the signal decreases below an acceptable value while a call is in progress.
  • the invention has made it possible to utilize in an uncomplicated manner the possibilities offered by a modern subscriber's exchange 1 to transfer calls and form "meet-me" answers, thus also obviating the need for a radio exchange having a comparatively complicated structure.
  • the installation is flexible in as much as it allows connection thereof to subscriber's exchanges of all dimensions.
  • the system is not either limited to a pre ⁇ determined number of base stations or radio cells.
  • the invention is not limited to the embodiment described and illustrated herein but a number of modifications are possible within the scope of the appended claims.
  • the interconnection unit 14 instead of temporary transferring a subscriber to the interconnection unit 14, the latter could be arranged to detect a ringing signal or other calling signal, for instance in the form of a digital cable (digital telephone). Also manually activated calls to the interconnection unit 14 may be made.
  • control unit 15 could be integrated in the interconnection unit 14 or in one of the base stations 2a-5b.

Abstract

Installation permettant la connexion de téléphones sans fil au central (1) d'un abonné afin de créer un système téléphonique sans fil, et comportant des stations de base immobiles (2a-5b) connectées par fil au central (1), et des combinés portatifs (10-13). Les stations de base (2a-5b) et les combinés (10-13) sont constitués d'émetteurs et de récepteurs radio à court rayon d'action. Ledit système téléphonique comporte une unité d'interconnexion (14) communiquant avec le central (1) par l'intermédiaire de fils et conçue pour détecter un signal d'appel dans le central (1) et pour transférer ce signal à une unité de commande (15). Cette dernière coopère avec les stations de base (2a-5b) et leur donne l'ordre de rechercher le combiné (10-13) auquel l'appel est destiné. La station de base (2a-5b) qui trouve le combiné (10-13) en question est conçue pour en informer l'unité de commande (15) et pour émettre simultanément un appel sans fil au combiné (10-13). Lorsqu'une réponse est reçue, on recherche une communication avec le central de l'abonné (1), lequel central peut ensuite établir une communication entre l'abonné demandeur et ladite station de base (2a-5b).
PCT/SE1991/000326 1990-05-11 1991-05-08 INSTALLATION PERMETTANT LA CONNEXION DE TELEPHONES SANS FIl AU CENTRAL TELEPHONIQUE D'UN ABONNE WO1991018484A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9001702A SE466829B (sv) 1990-05-11 1990-05-11 Anslutning av traadloesa telefoner till en abonnentvaexel
SE9001702-1 1990-05-11

Publications (1)

Publication Number Publication Date
WO1991018484A1 true WO1991018484A1 (fr) 1991-11-28

Family

ID=20379453

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000326 WO1991018484A1 (fr) 1990-05-11 1991-05-08 INSTALLATION PERMETTANT LA CONNEXION DE TELEPHONES SANS FIl AU CENTRAL TELEPHONIQUE D'UN ABONNE

Country Status (4)

Country Link
EP (1) EP0553083A1 (fr)
AU (1) AU7888491A (fr)
SE (1) SE466829B (fr)
WO (1) WO1991018484A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0569645A1 (fr) * 1991-04-12 1993-11-18 Dassault Automatismes Et Telecommunications Dispositif et procédé d'interconnexion téléphoniques destinés à offrir une continuité de service dans un réseau de communication à stations autonomes
DE4232863A1 (de) * 1992-09-30 1994-03-31 Siemens Ag Verfahren zur Steuerung der Verbindung zu einem an eine programmgesteuerte Nebenstellenanlage angeschlossenen Mobilendgerät
DE4232103A1 (de) * 1992-09-25 1994-03-31 Sel Alcatel Ag Schnurlose Telekommunikationsanlage
WO1995005720A1 (fr) * 1993-08-12 1995-02-23 Nokia Telecommunications Oy Systeme telephonique ct2
TR27974A (tr) * 1992-06-30 1995-11-01 Dassault Automatismes Bir iletisim sebekesi icindeki bagimsiz istasyonlara servis sürekliligi temin etmesi amaclanan telefon arabaglantisi icin cihaz ve yöntem.
AU698957B2 (en) * 1994-07-27 1998-11-12 Alcatel N.V. Dual/fixed mobile communication system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663762A (en) * 1970-12-21 1972-05-16 Bell Telephone Labor Inc Mobile communication system
GB2166622A (en) * 1984-09-14 1986-05-08 British Telecomm Cordless telephone system
US4599490A (en) * 1983-12-19 1986-07-08 At&T Bell Laboratories Control of telecommunication switching systems
EP0283683A2 (fr) * 1987-03-20 1988-09-28 Hitachi, Ltd. Système de communication sans-fil portable et méthode
EP0326104A2 (fr) * 1988-01-25 1989-08-02 Fujitsu Limited Système de changement de canal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663762A (en) * 1970-12-21 1972-05-16 Bell Telephone Labor Inc Mobile communication system
US4599490A (en) * 1983-12-19 1986-07-08 At&T Bell Laboratories Control of telecommunication switching systems
GB2166622A (en) * 1984-09-14 1986-05-08 British Telecomm Cordless telephone system
EP0283683A2 (fr) * 1987-03-20 1988-09-28 Hitachi, Ltd. Système de communication sans-fil portable et méthode
EP0326104A2 (fr) * 1988-01-25 1989-08-02 Fujitsu Limited Système de changement de canal

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0569645A1 (fr) * 1991-04-12 1993-11-18 Dassault Automatismes Et Telecommunications Dispositif et procédé d'interconnexion téléphoniques destinés à offrir une continuité de service dans un réseau de communication à stations autonomes
TR27974A (tr) * 1992-06-30 1995-11-01 Dassault Automatismes Bir iletisim sebekesi icindeki bagimsiz istasyonlara servis sürekliligi temin etmesi amaclanan telefon arabaglantisi icin cihaz ve yöntem.
DE4232103A1 (de) * 1992-09-25 1994-03-31 Sel Alcatel Ag Schnurlose Telekommunikationsanlage
DE4232863A1 (de) * 1992-09-30 1994-03-31 Siemens Ag Verfahren zur Steuerung der Verbindung zu einem an eine programmgesteuerte Nebenstellenanlage angeschlossenen Mobilendgerät
WO1995005720A1 (fr) * 1993-08-12 1995-02-23 Nokia Telecommunications Oy Systeme telephonique ct2
AU682714B2 (en) * 1993-08-12 1997-10-16 Nokia Telecommunications Oy CT2 telephone system
AU698957B2 (en) * 1994-07-27 1998-11-12 Alcatel N.V. Dual/fixed mobile communication system

Also Published As

Publication number Publication date
SE466829B (sv) 1992-04-06
SE9001702L (sv) 1991-11-12
AU7888491A (en) 1991-12-10
EP0553083A1 (fr) 1993-08-04
SE9001702D0 (sv) 1990-05-11

Similar Documents

Publication Publication Date Title
US5090051A (en) Radio communication system and method for connecting an incoming call to a wireless telephone
US5243641A (en) Extended range cordless telephone system
EP0647077B1 (fr) Méthode pour la commande d'un système mobile intégrant la voix et les données avec une pluralité de stations personnelles
JPS63248232A (ja) 移動通信方式
KR19990085981A (ko) 가정용 기지국에서 발신자 식별코드 전송방법
EP0661837A4 (fr) Systeme mobile de radiocommunications et appareils fixes et mobiles utilises avec ce systeme.
EP0921668B1 (fr) Système et méthode de communication AMRT
WO1991018484A1 (fr) INSTALLATION PERMETTANT LA CONNEXION DE TELEPHONES SANS FIl AU CENTRAL TELEPHONIQUE D'UN ABONNE
AU633444B2 (en) Extended range cordless telephone system
WO1991013509A1 (fr) Procede et systeme destines a etablir des liaisons a l'aide d'un telephone sans fil
JPS60136436A (ja) 無線電話システム
JPH04315326A (ja) 無線電話装置
KR0166635B1 (ko) 주파수 공용통신시스템에서의 휴대기의 최적중계국 파악방법
JPH0213026A (ja) 無線回線制御方式
JPS6324725A (ja) 選択呼出し可能なコ−ドレステレホンシステム
KR19990070276A (ko) 교환시스템에서 무선 송수신기를 이용한 호 전환 방법 및장치
KR960010861B1 (ko) 무선 키폰 전화기의 베이스 공유 장치 및 그 방법
JPH04287436A (ja) 移動通信システム
JPH0528536B2 (fr)
KR100207973B1 (ko) 코드없는 전화 시스템
JPH03192951A (ja) コードレス通信装置
JPS62277825A (ja) 無線電話装置
JPH0374980B2 (fr)
JPH03227145A (ja) コードレス電話システム
JPH0918947A (ja) 基地局

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AT AU BB BG BR CA CH DE DK ES FI GB HU JP KP KR LK LU MC MG MW NL NO PL RO SD SE SU US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE BF BJ CF CG CH CI CM DE DK ES FR GA GB GR IT LU ML MR NL SE SN TD TG

WWE Wipo information: entry into national phase

Ref document number: 1991909818

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWP Wipo information: published in national office

Ref document number: 1991909818

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: CA

WWW Wipo information: withdrawn in national office

Ref document number: 1991909818

Country of ref document: EP