EP0532726A1 - Switching arrangement for public switched telephone and public radio mobile networks - Google Patents

Switching arrangement for public switched telephone and public radio mobile networks

Info

Publication number
EP0532726A1
EP0532726A1 EP19920907403 EP92907403A EP0532726A1 EP 0532726 A1 EP0532726 A1 EP 0532726A1 EP 19920907403 EP19920907403 EP 19920907403 EP 92907403 A EP92907403 A EP 92907403A EP 0532726 A1 EP0532726 A1 EP 0532726A1
Authority
EP
European Patent Office
Prior art keywords
public
switched telephone
network
public switched
pcn
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Withdrawn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
EP19920907403
Other languages
German (de)
French (fr)
Inventor
Geoffrey Andrew 29 Arden Road Tooke
Charles Richard 22 Glaston Drive Stubbs
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.)
GPT Ltd
Plessey Telecommunications Ltd
Original Assignee
GPT Ltd
Plessey Telecommunications Ltd
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 GPT Ltd, Plessey Telecommunications Ltd filed Critical GPT Ltd
Publication of EP0532726A1 publication Critical patent/EP0532726A1/en
Withdrawn legal-status Critical Current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
    • H04W88/16—Gateway arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0435—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • 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]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • the present invention relates to Public Communications Networks (PCNs). These networks provide a mobile communications service to a user carrying a low-powered handset called a Mobile Station (MS).
  • PCNs Public Communications Networks
  • MS Mobile Station
  • a public switched telephone network comprising a plurality of digital main switching units each including a gateway mobile switching centre for a public communications network.
  • Each digital main switching unit is connectable to at least one mobile switching centre of a public communications network.
  • a digital main switching unit for a public switched telephone network including a gateway mobile switching centre for a public communications network.
  • FIG 1 shows a typical Public Communications Network interfaced to a Public Switched Telephone Network (PSTN);
  • PSTN Public Switched Telephone Network
  • FIG. 2 shows a Public Communication Network interfaced to a Public Switched Telephone Network in accordance with the present invention.
  • the PCN comprises a number of Base Station Systems (BSSs) limited to Mobile Switching Centres (MSCs). Each MSC has an associated Visited Location Register (VLR).
  • VLR Visited Location Register
  • a VLR contains information about PCN registered users who have been identified as being within the geographical area served by one of the BSS connected to the associated MSC. It is necessary for the user's Mobile Station (MS) to be switched "on" for the identification to take place.
  • MS Mobile Station
  • One or more MSCs in a PCN are interfaced to the PSTN via a Gateway Mobile Switching Centre connected to Digital Main Switching Unit (DMSU) otherwise known as a Trunk Exchange.
  • DMSU Digital Main Switching Unit
  • the functionality and interfaces of the GMSC are defined by the European standards body Groupe Speciale Mobile (GSM).
  • each PCN has a Home Location Register (HLR), which contains information about all registered users of the PCN, including their current location if known, obtained from the VLRs. This location information will identify the MSC serving the user's current location.
  • HLR Home Location Register
  • a PSTN user making a telephone call to a PCN registered user will dial the Mobile Subscriber Integrated Services Digital Network (MSISDN) number of that user.
  • MSISDN Mobile Subscriber Integrated Services Digital Network
  • the call is routed via a Local Exchange (LE) to the DMSU.
  • LE Local Exchange
  • the DMSU From routing tables located in the DMSU it can be determined that the call is destined for a registered user of the PCN.
  • the DMSU interrogates the HLR with a Send Routing Information (SRI) request.
  • SRI Send Routing Information
  • the HLR responds with a current Roaming Number (RN) for the called user or an indication that there is no current location information for the user (i.e. the user is not within range of a BSS or that the MS is switched Off).
  • RN current Roaming Number
  • the RN is used by the interrogating DMSU to determine which GMSC and MSC serve the called user's current location.
  • the call is then routed through the PSTN trunk network to the DMSU and GMSC which serve the called user's MSC.
  • the PSTN operator provides the trunk network for the PCN operator, who avoids the large capital investment to set up its own separate trunk network.
  • FIG. 2 there is shown an arrangement where the functionality of the PSTN DMSU and the PCN GMSC are combined in one physical unit, DMSU/GMSC, within the PSTN network.
  • the PCN operator does not need to install its own GMSCs, and the functionality is provided by the PSTN operator on selected DMSUs. While the invention has been described with particular reference to certain embodiments, neither the illustrated embodiment nor the terminology employed in describing them is intended to define the invention, which is intended to be limited only by- the scope of the appended claims.

Landscapes

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

Abstract

Réseau téléphonique commuté public (RTPC) comportant une pluralité d'unités générales de commutation numérique (DMSU) dont chacune comprend un centre tête de ligne mobile de commutation pour un réseau public de communication (PCN). En outre, une unité générale de commutation numérique pour un réseau téléphonique commuté public comprend un centre tête de ligne mobile de commutation pour un réseau public de communication.Public switched telephone network (PSTN) comprising a plurality of general digital switching units (DMSU) each of which comprises a mobile switching head end center for a public communication network (PCN). In addition, a general digital switching unit for a public switched telephone network includes a mobile switching head end center for a public communication network.

Description

PSTN/PCN SWITCHING ARRANGEMENT
The present invention relates to Public Communications Networks (PCNs). These networks provide a mobile communications service to a user carrying a low-powered handset called a Mobile Station (MS).
According to the present invention there is provided a public switched telephone network comprising a plurality of digital main switching units each including a gateway mobile switching centre for a public communications network.
Each digital main switching unit is connectable to at least one mobile switching centre of a public communications network.
According to the present invention there is further provided a digital main switching unit for a public switched telephone network including a gateway mobile switching centre for a public communications network.
The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:-
Figure 1 shows a typical Public Communications Network interfaced to a Public Switched Telephone Network (PSTN);
Figure 2 shows a Public Communication Network interfaced to a Public Switched Telephone Network in accordance with the present invention.
Referring to Figure 1, which shows a known version of a PCN/PSTN system, the PCN comprises a number of Base Station Systems (BSSs) limited to Mobile Switching Centres (MSCs). Each MSC has an associated Visited Location Register (VLR). A VLR contains information about PCN registered users who have been identified as being within the geographical area served by one of the BSS connected to the associated MSC. It is necessary for the user's Mobile Station (MS) to be switched "on" for the identification to take place.
One or more MSCs in a PCN are interfaced to the PSTN via a Gateway Mobile Switching Centre connected to Digital Main Switching Unit (DMSU) otherwise known as a Trunk Exchange. The functionality and interfaces of the GMSC are defined by the European standards body Groupe Speciale Mobile (GSM).
Additionally, each PCN has a Home Location Register (HLR), which contains information about all registered users of the PCN, including their current location if known, obtained from the VLRs. This location information will identify the MSC serving the user's current location.
A PSTN user making a telephone call to a PCN registered user will dial the Mobile Subscriber Integrated Services Digital Network (MSISDN) number of that user. The call is routed via a Local Exchange (LE) to the DMSU.
From routing tables located in the DMSU it can be determined that the call is destined for a registered user of the PCN. The DMSU interrogates the HLR with a Send Routing Information (SRI) request. The HLR responds with a current Roaming Number (RN) for the called user or an indication that there is no current location information for the user (i.e. the user is not within range of a BSS or that the MS is switched Off).
The RN is used by the interrogating DMSU to determine which GMSC and MSC serve the called user's current location. The call is then routed through the PSTN trunk network to the DMSU and GMSC which serve the called user's MSC.
Consequently, the PSTN operator provides the trunk network for the PCN operator, who avoids the large capital investment to set up its own separate trunk network.
Referring now to Figure 2, according to the present invention, there is shown an arrangement where the functionality of the PSTN DMSU and the PCN GMSC are combined in one physical unit, DMSU/GMSC, within the PSTN network. As a result the two logically separate networks share the same physical infrastructure. The PCN operator does not need to install its own GMSCs, and the functionality is provided by the PSTN operator on selected DMSUs. While the invention has been described with particular reference to certain embodiments, neither the illustrated embodiment nor the terminology employed in describing them is intended to define the invention, which is intended to be limited only by- the scope of the appended claims.

Claims

1. A public switched telephone network comprising a plurality of digital main switching units each including a gateway mobile switching centre for a public communications network.
2. A network, as claimed in Claim 1, wherein at least one of the digital main switching units includes a node connected to a home location register for interrogation thereof.
3. A network as claimed in Claim 1 or 2, wherein each digital main switching unit is connectable to at least one mobile switching centre of a public communications network.
4. A public switched telephone network, substantially as hereinbefore described, with reference to and as illustrated in, Figure 2 of the accompanying drawings.
5. A digital main switching unit for a public switched telephone network including a gateway mobile switching centre for a public communications network.
6. A digital main switching unit as claimed in Claim 5 and substantially as hereinbefore described, with reference to and as illustrated in Figure 2 of the accompanying drawings.
EP19920907403 1991-04-03 1992-04-03 Switching arrangement for public switched telephone and public radio mobile networks Withdrawn EP0532726A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9106982 1991-04-03
GB9106982A GB2254521A (en) 1991-04-03 1991-04-03 Pstn/pcn switching arrangement

Publications (1)

Publication Number Publication Date
EP0532726A1 true EP0532726A1 (en) 1993-03-24

Family

ID=10692586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920907403 Withdrawn EP0532726A1 (en) 1991-04-03 1992-04-03 Switching arrangement for public switched telephone and public radio mobile networks

Country Status (5)

Country Link
EP (1) EP0532726A1 (en)
JP (1) JPH05507838A (en)
AU (1) AU1469592A (en)
GB (1) GB2254521A (en)
WO (1) WO1992017986A2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5307400A (en) * 1991-11-25 1994-04-26 Telefonaktiebolaget L M. Ericsson Call routing in mobile telephone systems
SE500197C2 (en) * 1992-08-18 1994-05-02 Ericsson Telefon Ab L M Communication network, method of establishing a connection and registration method in such a network
DE4335031A1 (en) * 1993-10-14 1995-04-20 Sel Alcatel Ag Mobile network and conference service facility therefor
DE4427072C1 (en) * 1994-08-01 1996-02-22 Deutsche Telekom Mobil Call forwarding appts. for relaying call from first communication network to second remote group telephone system (GSM)
KR0161156B1 (en) * 1995-12-21 1998-12-01 유기범 Method for selecting routing network on switching call with mobile subscriber
US5901359A (en) * 1997-01-03 1999-05-04 U S West, Inc. System and method for a wireline-wireless network interface

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2638307B1 (en) * 1988-10-21 1994-06-10 Cit Alcatel SWITCHING CENTER FOR RADIOMOBILE APPLICATION

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9217986A2 *

Also Published As

Publication number Publication date
GB2254521A (en) 1992-10-07
GB9106982D0 (en) 1991-05-22
WO1992017986A2 (en) 1992-10-15
AU1469592A (en) 1992-11-02
JPH05507838A (en) 1993-11-04
WO1992017986A3 (en) 1992-11-26

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