EP0553083A1 - 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

Info

Publication number
EP0553083A1
EP0553083A1 EP19910909818 EP91909818A EP0553083A1 EP 0553083 A1 EP0553083 A1 EP 0553083A1 EP 19910909818 EP19910909818 EP 19910909818 EP 91909818 A EP91909818 A EP 91909818A EP 0553083 A1 EP0553083 A1 EP 0553083A1
Authority
EP
European Patent Office
Prior art keywords
exchange
handset
subscriber
call
base station
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Withdrawn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
EP19910909818
Other languages
German (de)
English (en)
Inventor
Ragnar WIKSTRÖM
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.)
Tateco AB
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 EP0553083A1 publication Critical patent/EP0553083A1/fr
Withdrawn legal-status Critical Current

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.

Landscapes

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

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).
EP19910909818 1990-05-11 1991-05-08 INSTALLATION PERMETTANT LA CONNEXION DE TELEPHONES SANS FIl AU CENTRAL TELEPHONIQUE D'UN ABONNE Withdrawn EP0553083A1 (fr)

Applications Claiming Priority (2)

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

Publications (1)

Publication Number Publication Date
EP0553083A1 true EP0553083A1 (fr) 1993-08-04

Family

ID=20379453

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910909818 Withdrawn EP0553083A1 (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)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675325B1 (fr) * 1991-04-12 1993-07-16 Dassault Electronique Dispositif et procede d'interconnexion telephoniques destines a offrir une continuite de service dans un reseau de communication a 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
FI98429C (fi) * 1993-08-12 1997-06-10 Nokia Telecommunications Oy CT2-puhelinjärjestelmä
ES2102956B1 (es) * 1994-07-27 1998-04-01 Alcatel Standard Electrica Sistema de comunicaciones dual fijo-movil.

Family Cites Families (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
EP0283683B1 (fr) * 1987-03-20 1994-01-12 Hitachi, Ltd. Système de communication sans-fil portable et méthode
JP2548763B2 (ja) * 1988-01-25 1996-10-30 富士通株式会社 移動体通信の通話中ゾーン切換え方法と制御交換局

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9118484A1 *

Also Published As

Publication number Publication date
WO1991018484A1 (fr) 1991-11-28
AU7888491A (en) 1991-12-10
SE466829B (sv) 1992-04-06
SE9001702D0 (sv) 1990-05-11
SE9001702L (sv) 1991-11-12

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