WO1991018484A1 - Installation for connection of cordless telephone sets to a subscriber's telephone exchange - Google Patents
Installation for connection of cordless telephone sets to a subscriber's telephone exchange Download PDFInfo
- 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
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
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9001702-1 | 1990-05-11 | ||
SE9001702A SE466829B (en) | 1990-05-11 | 1990-05-11 | CONNECTING WIRELESS PHONES TO A SUBSCRIBER |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991018484A1 true WO1991018484A1 (en) | 1991-11-28 |
Family
ID=20379453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1991/000326 WO1991018484A1 (en) | 1990-05-11 | 1991-05-08 | Installation for connection of cordless telephone sets to a subscriber's telephone exchange |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0553083A1 (en) |
AU (1) | AU7888491A (en) |
SE (1) | SE466829B (en) |
WO (1) | WO1991018484A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0569645A1 (en) * | 1991-04-12 | 1993-11-18 | Dassault Automatismes Et Telecommunications | Method and arrangement for telephone connections with continuity of service in a communication network with autonomous stations |
DE4232863A1 (en) * | 1992-09-30 | 1994-03-31 | Siemens Ag | Controlling connection for mobile subscriber coupled to programme-controlled telephone exchange - using specific control programme module for each radio communication system to develop connection protocol |
DE4232103A1 (en) * | 1992-09-25 | 1994-03-31 | Sel Alcatel Ag | Cordless telecommunications installation with cordless telephone appts. - has installation and telephone appts. linked via subscriber coupling lines, to which base station and cordless handset are coupled. |
WO1995005720A1 (en) * | 1993-08-12 | 1995-02-23 | Nokia Telecommunications Oy | Ct2 telephone system |
TR27974A (en) * | 1992-06-30 | 1995-11-01 | Dassault Automatismes | Device and method for telephone interconnection intended to provide service continuity to independent stations within a communication network. |
AU698957B2 (en) * | 1994-07-27 | 1998-11-12 | Alcatel N.V. | Dual/fixed mobile communication system |
Citations (5)
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 (en) * | 1987-03-20 | 1988-09-28 | Hitachi, Ltd. | Portable wireless communication systems and method |
EP0326104A2 (en) * | 1988-01-25 | 1989-08-02 | Fujitsu Limited | Channel changing system |
-
1990
- 1990-05-11 SE SE9001702A patent/SE466829B/en not_active IP Right Cessation
-
1991
- 1991-05-08 WO PCT/SE1991/000326 patent/WO1991018484A1/en not_active Application Discontinuation
- 1991-05-08 AU AU78884/91A patent/AU7888491A/en not_active Abandoned
- 1991-05-08 EP EP19910909818 patent/EP0553083A1/en not_active Withdrawn
Patent Citations (5)
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 (en) * | 1987-03-20 | 1988-09-28 | Hitachi, Ltd. | Portable wireless communication systems and method |
EP0326104A2 (en) * | 1988-01-25 | 1989-08-02 | Fujitsu Limited | Channel changing system |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0569645A1 (en) * | 1991-04-12 | 1993-11-18 | Dassault Automatismes Et Telecommunications | Method and arrangement for telephone connections with continuity of service in a communication network with autonomous stations |
TR27974A (en) * | 1992-06-30 | 1995-11-01 | Dassault Automatismes | Device and method for telephone interconnection intended to provide service continuity to independent stations within a communication network. |
DE4232103A1 (en) * | 1992-09-25 | 1994-03-31 | Sel Alcatel Ag | Cordless telecommunications installation with cordless telephone appts. - has installation and telephone appts. linked via subscriber coupling lines, to which base station and cordless handset are coupled. |
DE4232863A1 (en) * | 1992-09-30 | 1994-03-31 | Siemens Ag | Controlling connection for mobile subscriber coupled to programme-controlled telephone exchange - using specific control programme module for each radio communication system to develop connection protocol |
WO1995005720A1 (en) * | 1993-08-12 | 1995-02-23 | Nokia Telecommunications Oy | Ct2 telephone system |
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 |
---|---|
AU7888491A (en) | 1991-12-10 |
SE466829B (en) | 1992-04-06 |
SE9001702D0 (en) | 1990-05-11 |
EP0553083A1 (en) | 1993-08-04 |
SE9001702L (en) | 1991-11-12 |
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