WO1994016531A1 - Arrangement for establishing telephone links in a cordless communications system by call transmission - Google Patents

Arrangement for establishing telephone links in a cordless communications system by call transmission Download PDF

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Publication number
WO1994016531A1
WO1994016531A1 PCT/DE1993/001196 DE9301196W WO9416531A1 WO 1994016531 A1 WO1994016531 A1 WO 1994016531A1 DE 9301196 W DE9301196 W DE 9301196W WO 9416531 A1 WO9416531 A1 WO 9416531A1
Authority
WO
WIPO (PCT)
Prior art keywords
radio
assigned
switching
switching unit
radio switching
Prior art date
Application number
PCT/DE1993/001196
Other languages
German (de)
French (fr)
Inventor
Klaus Wille
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP94901758A priority Critical patent/EP0677231A1/en
Publication of WO1994016531A1 publication Critical patent/WO1994016531A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13095—PIN / Access code, authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13097—Numbering, addressing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13098—Mobile subscriber
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13204—Protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1322—PBX
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1328—Call transfer, e.g. in PBX
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Definitions

  • the invention relates to an arrangement for producing telecommunications connections.
  • a communication system is already known from European patent specification 0 226 610, which consists of a private branch exchange, a radio switching center, stationary units (base stations) and cordless telephones.
  • the radio switching center connected to the private branch exchange is connected to several stationary units via connecting lines.
  • the cordless telephones can set up telecommunications connections regardless of their local assignment to one of these base stations; this also applies to connections which are set up to the cordless telephones.
  • a cordless telephone which is involved in a telecommunication connection, changes its location in such a way that the reception or transmission quality decreases over the previously activated base station and that the transmission or reception quality is improved at the same time via another base station, this is done as part of the existing telecommunications connection, a switchover to the base station, via which the better quality of the connection is achieved ("handover").
  • the known communication system does not allow any telecommunication connections that go beyond the area of the private branch exchange or through different radio switching centers.
  • the object of the invention is to provide an arrangement of the type mentioned at the beginning, which includes telecommunications connections Participation of at least one cordless phone in one
  • Telecommunication connections are used in such a complex system of switching systems known per se, without interfering with the switching-related control procedures.
  • the invention is distinguished by the particular advantage that the cordless telephones involved in the telecommunications connections have the performance features assigned to them in their original switching system (PBX1) available at all locations in the range of action of all base stations without restriction. This also applies to bass stations that are connected to other than the original radio switching unit.
  • PBX1 original switching system
  • Fig. 1 shows an arrangement according to the invention with a first
  • Connecting path 2 shows an arrangement according to the invention with a second connection path
  • 3 shows the connection structure in a handover procedure.
  • the communication system shown in Fig. 1 consists of a first and a second switching system PBX1, PBX2.
  • Such switching systems are, for example, from the Siemens documents "Hicom 300 System, Product Data”, Ordering No. A 19100-K3161-GA30-X- 7600, pages 55-57 and "ISDN in the Office” Special Issue of telcom report and Siemens Magazine con 1985, pages
  • a first radio switching unit (Radio Exchange) RE1 is assigned to the first switching system PBXl. arranges and connects to the switching system PBX1 via known ISDN subscriber connection lines.
  • the first radio switching unit RE1 is connected to at least one base station BSL1, possibly also to a plurality of base stations BSL1 ... BSLn, each via a connecting line.
  • the second switching system PBX2, the second radio switching unit RE2 and the base stations BS2.1,... BS2.m are structured in a corresponding manner.
  • Connections via public and private networks can be established between the first and the second switching system.
  • the radio switching units RE1, RE2 each contain a controller CRE1, CRE2 and memory MRE1, MRE2, which are used to hold data, the fixed assignment of mobile terminals PT1, ... and base stations as well as a current local assignment of the mobile terminals to the radio switching units describe.
  • Each terminal is always assigned to exactly one radio switching unit as the original (home) radio switching unit.
  • the assignment results from terminal-specific identification information, which is stored in the respective radio switching unit and the respective terminal and is exchanged between the mobile terminals, the base stations and the sub-switching units in preparation for and during the connection.
  • a fixed internal or external subscriber station FT1 and FT2 is shown for each switching system PBX1, PBX2.
  • the arrangement according to the invention realizes the performance features known as "roaming" and "handover" for cordless telephone systems.
  • the "roaming" feature is that the current local assignment of a mobile terminal, which changes from the radio range of a first base station to the radio range of a second base station, is recorded by the system, with no voice or user data connection during this change .
  • the "handover" feature is that a
  • Voice or user data connection is continued without interruption if a mobile terminal changes during the connection from the radio area of a first base station to the radio area of a second base station.
  • the controls CRE1 and CRE2 of the two radio switching units RE1, RE2 are assigned a control program which is designed in such a way that the telecommunications connections are independent of the location of the mobile terminal involved in the respective telecommunications connection, e.g. PT1, via the radio switching unit assigned to this terminal on the basis of the identification information, e.g. REl.
  • This is in Fig. 1 for the case of an incoming or outgoing telecommunication connection between a fixed one
  • FT1 of the first switching system PBX1 and the mobile terminal PT1 is shown, which is located in the area of a "foreign" base station BS2.m.
  • the connection path is shown in dashed lines: FT1-PBX1-RE1-PBX1 (eg connection line set TRD-TR2 / PBX2 (connection line set TR2 of the switching system PBX2) -RE2-BS2.m-PTl.
  • the first one is controlled by a controller Switching system PBX1 establishes a first connection to the first radio switching unit RE1 on the basis of the telephone number dialed by PTl from PTl.
  • the controller CRE1 of this radio switching unit unit REl initiates a second connection that the
  • connection line set TR1 ISDN network interface of ISDN telecommunications systems
  • the phone number of the terminal PT1 is given as the "Called Party" address and the phone number of the second radio switching unit RE2 as the "Connected Party” address.
  • the radio switching unit RE1 links the first connection from PBXl to REl with the second connection from REl via RE2 to PTl.
  • the first and the second connection form the total connection from FTl to PTl.
  • connection path shown in dashed lines in FIG. 1 thus does not lead from FT1 within the switching system PBX1 directly via the switching matrix to the connection line set TR1 but first to the first radio switching center RE1 and only afterwards to the connection line set TR1.
  • the properties assigned to a mobile subscriber, such as a fixed subscriber, such as authorizations, activated performance features, switching statuses, etc., in the switching system can thus be controlled in the same way as for a fixed subscriber. This means that the switching system can treat connections for mobile subscribers with all the features without special measures, such as connections for fixed subscribers.
  • connection path 2 shows the connection path in the event that an (internal or external) fixed subscriber station FT2, starting from the second switching system PBX2, establishes a connection to the mobile terminal PT1, which is also the same as in the case illustrated in FIG. 1 is in the radio range of the "foreign" base station BS2.m.
  • This connection path is represented as follows: FT2-PBX2 (TR2) -TRl / PBXl-REl-PBXl / TRl-TR2 / PBX2-RE2-BS2.m-PTl.
  • Each base station BSl.l, ... BSl.n BS2.1, ... BS2.m identifies the mobile terminals PT1, ... located in its radio area on the basis of the respective identification information. If the terminal PT1 changes its location, for example, from the radio range, for example from the base station BS1.1 assigned to it, to the radio range from BS2.m, then this base station BS2.m reports the current presence of the terminal PT1 to the first radio switch permanently assigned to this terminal PT1 ⁇ development unit REl.
  • the controller CRE2 of the radio switching unit RE2 accesses the corresponding information that is stored in the memory MRE2 and establishes a connection to the first radio switching unit RE1, where this information is stored in the memory MRE1.
  • These signaling data connections between RE2 and RE1 are established as shown in FIGS. 1 and 2 for voice or user data connections via PBX2 and PBXl; alternatively, the signaling data are transmitted via a separate data line L-V.24 (Fig. 3).
  • Handover procedures pursue the goal of making the switchover from the previously used connection path via RE1 to the new path via RE2 without interruption when changing the radio range.
  • the transmission path is interrupted by different the run times of the messages for the control of the switchover.
  • These signaling messages are exchanged between the mobile terminal PT1 and the radio area units RE1 and RE2.
  • the terminal PTl transmits a handover request via the base station BS2.m to the radio switching unit RE2;
  • the terminal PT1 triggered by issuing the handover request, the terminal PT1 establishes a connection via the base station BS2.m to the second radio switching unit RE2 and goes into the so-called broadcast transmission mode to the radio switching centers RE1, RE2;
  • the radio switching unit RE2 establishes a connection to the first radio switching unit RE1, which corresponds to a subscriber-initiated connection;
  • RE1 also goes to RE2 after the connection to broadcast transmission has been established
  • RE2 then sends the confirmation message via BS2 to the terminal PT1 that the new path has been set up via RE2;
  • the terminal PTl ends the parallel transmission to base st 'ation BSl.l
  • REI also stops the parallel transmission to BSl.l
  • the connection via BS1 builds off.
  • the advantage of the procedure according to the invention for handover between two different radio switching units RE1 and RE2 is that the control of the ISDN telecommunication system for handover does not have to perform any specific functions.
  • the connection between the radio switching units RE1 and RE2 as part of the overall connection between FTl and PTl corresponds to an ISDN connection that is initiated by stationary subscribers of a switching system with several telecommunication systems.
  • the radio switching units RE1, RE2 can be connected to a separate data line LV.24, the control program assigned to the controllers CRE1, CRE2 of the radio switching units RE1, RE2 being designed in such a way that signaling data indicating the current locations of mobile terminals PT1, ... designate to be transmitted over this separate data line.

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

Abstract

An arrangement for establishing telephone links in a communications system consisting of at least one first exchange (PBX1) and a second one (PBX2). To the first (PBX1) and second exchanges (PBX2) are allocated a first (RE1) and a second radio exchange unit (RE2) which are each connected to at least one base station (BS1.1,...,BS1.n; BS2.1,...BS2.2m). Mobile terminals (PT1,...) are allocated by means of their own individual identification information precisely to a radio exchange unit (RE1, RE2) as an original radio exchange unit and to each such unit (RE1, RE2) is allocated a control (CRE1, CRE2) with a control program for establishing telephone links, in which at least one mobile terminal (PT1) is involved. The control program allocated to the controls (CRE1, CRE2) of the radio exchange unit (RE1, RE2) is designed in such a way that the telephone links are established regardless of the location of the mobile terminal (PT1) involved in the telephone link concerned via the original radio exchange unit (RE1) allocated to said terminal (PT1) on the basis of the identification information.

Description

Anordnung zur Herstellung von Fernmeldeverbindungen in einem schnurlosen Kommunikationssystem durch Anrufweiterleitung Arrangement for establishing telecommunications connections in a cordless communication system by means of call forwarding
Anordnung zur Herstellung von FernmeldeverbindungenArrangement for establishing telecommunications connections
Die Erfindung betrifft eine Anordnung zur Herstellung von FernmeldeVerbindungen.The invention relates to an arrangement for producing telecommunications connections.
Es sind bereits unterschiedliche Kommunikationssysteme zur Herstellung von Fernmeldeverbindungen von bzw. zu Schnur¬ lostelefonen bekannt. Aus der europäischen Patentschrift 0 226 610 ist bereits ein Kommunikationssystem bekannt, das aus einer Nebenstellenanlage, einer Funkvermittlungs¬ stelle, aus stationären Einheiten (Basisstationen) sowie aus Schnurlostelefonen besteht. Dabei ist die an die Ne¬ benstellenanlage angeschaltete Funkvermittlungsstelle über Verbindungsleitungen mit mehreren stationären Einheiten verbunden. Die Schnurlostelefone können Fernmeldeverbin¬ dungen unabhängig von ihrer örtlichen Zuordnung zu einer dieser Basisstationen aufbauen; dies gilt auch für Verbin¬ dungen, die zu den Schnurlostelefonen aufgebaut werden. Ändert ein Schnurlostelefon, das an einer Fernmeldeverbin- duπg beteiligt ist, seinen Ort in der Weise, daß die Empfangs- bzw. Sendequalität über die bisher aktivierte Basisstation nachläßt und daß gleichzeitig die Sende- bzw. Empfangsqualität über eine andere Basisstation verbessert wird, so erfolgt im Rahmen der bestehenden Fernmeldever¬ bindung eine Umschaltung auf die Basisstation, über die die bessere Qualität der Verbindung realisiert wird ( "Handover" ) . Das bekannte Kommunikationssystem erlaubt jedoch keine Fernmeldeverbindungen, die über den Bereich der Nebenstellenanlage hinaus bzw. über unterschiedliche Funkvermittlungsstellen geführt werden.Different communication systems for establishing telecommunication connections from or to cordless telephones are already known. A communication system is already known from European patent specification 0 226 610, which consists of a private branch exchange, a radio switching center, stationary units (base stations) and cordless telephones. The radio switching center connected to the private branch exchange is connected to several stationary units via connecting lines. The cordless telephones can set up telecommunications connections regardless of their local assignment to one of these base stations; this also applies to connections which are set up to the cordless telephones. If a cordless telephone, which is involved in a telecommunication connection, changes its location in such a way that the reception or transmission quality decreases over the previously activated base station and that the transmission or reception quality is improved at the same time via another base station, this is done as part of the existing telecommunications connection, a switchover to the base station, via which the better quality of the connection is achieved ("handover"). However, the known communication system does not allow any telecommunication connections that go beyond the area of the private branch exchange or through different radio switching centers.
Ausgehend von diesem Stand der Technik liegt der Erfin¬ dung die Aufgabe zugrunde, eine Anordnung der eingangs ge¬ nannten Art anzugeben, die Fernmeldeverbindungen unter Beteiligung mindestens eines Schnurlostelefons in einemOn the basis of this prior art, the object of the invention is to provide an arrangement of the type mentioned at the beginning, which includes telecommunications connections Participation of at least one cordless phone in one
Kommunikationssystem mit mehreren Funktvermittlungsanlagen ermöglicht.Communication system with multiple radio switching systems enabled.
Als wesentlich für die Erfindung ist anzusehen, daß beiIt is to be regarded as essential for the invention that at
Fernmeldeverbindungen in einem derart komplexen System an sich bekannte Vermittlungsanlagen verwendet werden, ohne daß Eingriffe in die vermittlungstechnischen Steuerungs¬ prozeduren vorzunehmen sind. Gleichzeitig zeichnet sich die Erfindung durch den besonderen Vorteil aus, daß die an den Fernmeldeverbindungen beteiligten Schnurlostelefone die ihnen in ihrer originären Vermittlungsanlage (PBXl) zugewiesenen Leistungsmerkmale an allen Orten im Wirkungs¬ bereich sämtlicher Basisstationen uneingeschränkt zur Ver- fügung stehen. Dies gilt auch für Bassistationen, die an anderen als der originären Funkvermittlungseinheit ange¬ schlossen sind.Telecommunication connections are used in such a complex system of switching systems known per se, without interfering with the switching-related control procedures. At the same time, the invention is distinguished by the particular advantage that the cordless telephones involved in the telecommunications connections have the performance features assigned to them in their original switching system (PBX1) available at all locations in the range of action of all base stations without restriction. This also applies to bass stations that are connected to other than the original radio switching unit.
Die Erfindung wird nun anhand der Figuren beschrieben. Es zeigtThe invention will now be described with reference to the figures. It shows
Fig. 1 eine erfindungsgemäße Anordnung mit einem erstenFig. 1 shows an arrangement according to the invention with a first
Verbindungsweg; Fig. 2 eine erfindungsgemäße Anordnung mit einem zweiten Verbindungsweg; undConnecting path; 2 shows an arrangement according to the invention with a second connection path; and
Fig. 3 die Verbindungsstruktur bei einer Handover-Proze- dur.3 shows the connection structure in a handover procedure.
Das in Fig. 1 dargestellte Kommunikationssystem besteht aus einer ersten und aus einer zweiten Vermittlungsanlage PBX1,PBX2. Derartige Vermittlungsanlagen sind beispiels¬ weise aus den Schriften der Firma Siemens "Hicom 300 Sys¬ tem, Product Data", Ordering No. A 19100-K3161-GA30-X- 7600, Seiten 55-57 und "ISDN in the Office" Special Issue of telcom report and Siemens Magazine con 1985, SeitenThe communication system shown in Fig. 1 consists of a first and a second switching system PBX1, PBX2. Such switching systems are, for example, from the Siemens documents "Hicom 300 System, Product Data", Ordering No. A 19100-K3161-GA30-X- 7600, pages 55-57 and "ISDN in the Office" Special Issue of telcom report and Siemens Magazine con 1985, pages
48-72 bekannt. Der ersten Vermittlungsanlage PBXl ist eine erste Funkvermittlungseinheit (Radio Exchange) REl zuge- ordnet und über bekannte ISDN-Teilnehmer-Verbindungslei¬ tungen mit der Vermittlungsanlage PBXl verbunden. Die erste Funkvermittlungseinheit REl ist mit mindestens einer Basisstation BSl.l, gegebenenfalls auch mit einer Mehrzahl von Basisstationen BSl.l,...BSl.n über je eine Verbin¬ dungsleitung verbunden.48-72 known. A first radio switching unit (Radio Exchange) RE1 is assigned to the first switching system PBXl. arranges and connects to the switching system PBX1 via known ISDN subscriber connection lines. The first radio switching unit RE1 is connected to at least one base station BSL1, possibly also to a plurality of base stations BSL1 ... BSLn, each via a connecting line.
In entsprechender Weise sind die zweite Vermittlungsanlage PBX2, die zweite Funkvermittlungseinheit RE2 sowie die Basisstationen BS2.1,...BS2.m strukturiert.The second switching system PBX2, the second radio switching unit RE2 and the base stations BS2.1,... BS2.m are structured in a corresponding manner.
Zwischen der ersten und der zweiten Vermittlungsanlage sind Verbindungen über öffentliche und private Netze her¬ stellbar.Connections via public and private networks can be established between the first and the second switching system.
Die Funkvermittlungseinheiten RE1,RE2 enthalten jeweils eine Steuerung CRE1,CRE2 sowie Speicher MRE1,MRE2, die der Aufnahme von Daten dienen, die die feste Zuordnung von mobilen Endgeräten PT1,... und Basisstationen sowie eine aktuelle örtliche Zuordnung der mobilen Endgeräte zu den Funkvermittlungseinheiten bezeichnen.The radio switching units RE1, RE2 each contain a controller CRE1, CRE2 and memory MRE1, MRE2, which are used to hold data, the fixed assignment of mobile terminals PT1, ... and base stations as well as a current local assignment of the mobile terminals to the radio switching units describe.
Jedes Endgerät ist jeweils genau einer Funkvermittlungs¬ einheit als originärer (Heimat-) Funkvermittlungseinheit fest zugeordnet. Die Zuordnung ergibt sich aus einer end- geräteindividuellen Identifizierungsinformation, die in der jeweiligen Funkvermittlungseinheit und dem jeweiligen Endgerät abgelegt ist und verbindungsvorbereitend und verbindungsbegleitend zwischen den mobilen Endgeräten, den Basisstationen und den Teilvermittlungseinheiten aus¬ getauscht werden.Each terminal is always assigned to exactly one radio switching unit as the original (home) radio switching unit. The assignment results from terminal-specific identification information, which is stored in the respective radio switching unit and the respective terminal and is exchanged between the mobile terminals, the base stations and the sub-switching units in preparation for and during the connection.
Zu jeder Vermittlungsanlage PBX1,PBX2 ist jeweils eine ortsfeste interne oder externe Teilnehmerstelle FT1 und FT2 dargestellt. Die erfindungsgemäße Anordnung realisiert die für Schnur¬ lostelefonsysteme bekannten Leistungsmerkmale "Roaming" und "Handover". Das Leistungsmerkmal "Roaming" besteht darin, daß die aktuelle örtliche Zuordnung eines mobilen Endgeräts, das von dem Funkbereich einer ersten Basis¬ station zu dem Funkbereich einer zweiten Basisstation wechselt, vom System erfaßt wird, wobei während dieses Wechsels keine Sprach- bzw. Nutzdatenverbindung besteht.A fixed internal or external subscriber station FT1 and FT2 is shown for each switching system PBX1, PBX2. The arrangement according to the invention realizes the performance features known as "roaming" and "handover" for cordless telephone systems. The "roaming" feature is that the current local assignment of a mobile terminal, which changes from the radio range of a first base station to the radio range of a second base station, is recorded by the system, with no voice or user data connection during this change .
Das Leistungsmerkmal "Handover" besteht darin, daß eineThe "handover" feature is that a
Sprach- bzw. Nutzdatenverbindung unterbrechungsfrei fort¬ geführt wird, wenn ein mobiles Endgerät während einer Verbindung von dem Funkbereich einer ersten Basisstation zu dem Funkbereich einer zweiten Basisstation wechselt.Voice or user data connection is continued without interruption if a mobile terminal changes during the connection from the radio area of a first base station to the radio area of a second base station.
In der erfindungsgemäßen Anordnung ist den Steuerungen CREl und CRE2 der beiden Funkvermittlungseinheiten RE1,RE2 ein Steuerprogramm zugeordnet, das in der Weise ausgestal¬ tet ist, daß die Fernmeldeverbindungen unabhängig vom Ort des an der jeweiligen Fernmeldeverbindung beteiligten mobilen Endgeräts, z.B. PTl, über die, diesem Endgerät aufgrund der Identifizierungsinformation zugeordneten Funkvermittlungseinheit, z.B. REl, hergestellt werden. Dies ist in Fig. 1 für den Fall einer kommenden oder gehenden Fernmeldeverbindung zwischen einer ortsfestenIn the arrangement according to the invention, the controls CRE1 and CRE2 of the two radio switching units RE1, RE2 are assigned a control program which is designed in such a way that the telecommunications connections are independent of the location of the mobile terminal involved in the respective telecommunications connection, e.g. PT1, via the radio switching unit assigned to this terminal on the basis of the identification information, e.g. REl. This is in Fig. 1 for the case of an incoming or outgoing telecommunication connection between a fixed one
(internen oder externen) Teilnehmerstelle FTl der ersten Vermittlungsanlage PBXl und dem mobilen Endgerät PTl dar¬ gestellt, das sich im Bereich einer "fremden" Basisstation BS2.m befindet. Der Verbindungsweg ist gestrichelt einge- zeichnet: FT1-PBX1-RE1-PBX1 (z.B. Verbindungsleitungssatz TRD-TR2/PBX2 (Verbindungsleitungssatz TR2 der Vermitt¬ lungsanlage PBX2)-RE2-BS2.m-PTl. Bei dieser Verbindung stellt zunächst eine Steuerung der ersten Vermittlungsan¬ lage PBXl aufgrund der von FTl gewählten Rufnummer von PTl eine erste Verbindung zu der ersten Funkvermittlungsein¬ heit REl her. Die Steuerung CREl dieser Funkvermittlungs- einheit REl initiiert eine zweite Verbindung, die die(Internal or external) subscriber station FT1 of the first switching system PBX1 and the mobile terminal PT1 is shown, which is located in the area of a "foreign" base station BS2.m. The connection path is shown in dashed lines: FT1-PBX1-RE1-PBX1 (eg connection line set TRD-TR2 / PBX2 (connection line set TR2 of the switching system PBX2) -RE2-BS2.m-PTl. With this connection, the first one is controlled by a controller Switching system PBX1 establishes a first connection to the first radio switching unit RE1 on the basis of the telephone number dialed by PTl from PTl. The controller CRE1 of this radio switching unit unit REl initiates a second connection that the
Steuerung der ersten Vermittlungsanlage PBXl über den Ver¬ bindungsleitungssatz TR1 (ISDN-Netzschnittstelle von ISDN- Telekommunikationsanlagen) zu der zweiten Vermittlungs- anläge PBX2 herstellt, an der sich das gewünschte mobile Endgerät PTl befindet. In dem ISDN-Meldungsformat ist dabei die Rufnummer des Endgeräts PTl als "Called Party"- Adresse angegeben und die Rufnummer der zweiten Funkver¬ mittlungseinheit RE2 als "Connected Party"-Adresse. Die Funkvermittlungseinheit REl verknüpft die erste Verbindung von PBXl zu REl mit der zweiten Verbindung von REl über RE2 zu PTl. Die erste und die zweite Verbindung bilden die Gesamtverbinduπg von FTl zu PTl.Control of the first switching system PBX1 via the connection line set TR1 (ISDN network interface of ISDN telecommunications systems) to the second switching system PBX2, on which the desired mobile terminal PT1 is located. In the ISDN message format, the phone number of the terminal PT1 is given as the "Called Party" address and the phone number of the second radio switching unit RE2 as the "Connected Party" address. The radio switching unit RE1 links the first connection from PBXl to REl with the second connection from REl via RE2 to PTl. The first and the second connection form the total connection from FTl to PTl.
Der in Fig. 1 gestrichelt dargestellte Verbindungsweg führt also von FTl innerhalb der Vermittlungsanlage PBXl nicht unmittelbar über das Koppelfeld zum Verbindungs¬ leitungssatz TR1 sondern zunächst zu der ersten Funkver¬ mittlungsstelle REl und erst im Anschluß daran zum Verbin- dungsleitungssatz TR1.The connection path shown in dashed lines in FIG. 1 thus does not lead from FT1 within the switching system PBX1 directly via the switching matrix to the connection line set TR1 but first to the first radio switching center RE1 and only afterwards to the connection line set TR1.
Damit sind die in der Vermittlungsanlage einem mobilen Teilnehmer wie einem ortsfesten Teilnehmer zugeordneten Eigenschaften wie Berechtigungen, aktivierte Leistungs- merkmale, vermittlungstechnische Zustände usw. in glei¬ cher Weise steuerbar, wie bei einem ortsfesten Teilnehmer. D.h., daß die Vermittlungsanlage Anschlüsse für mobile Teilnehmer mit sämtlichen Leistungsmerkmalen ohne Sonder¬ maßnahmen wie Anschlüsse von ortsfesten Teilnehmern be- handeln kann.The properties assigned to a mobile subscriber, such as a fixed subscriber, such as authorizations, activated performance features, switching statuses, etc., in the switching system can thus be controlled in the same way as for a fixed subscriber. This means that the switching system can treat connections for mobile subscribers with all the features without special measures, such as connections for fixed subscribers.
In Fig. 2 ist der Verbindungsweg für den Fall dargestellt, daß eine (interne oder externe) ortsfeste Teilnehmerstelle FT2 ausgehend von der zweiten Vermittlungsanlage PBX2 eine Verbindung zu dem mobilen Endgerät PTl herstellt, das sich ebenfalls wie bei dem anhand von Fig. 1 dargestellten Fall im Funkbereich der "fremden" Basisstation BS2.m befindet. Dieser Verbindungsweg stellt sich folgendermaßen dar: FT2- PBX2 (TR2)-TRl/PBXl-REl-PBXl/TRl-TR2/PBX2-RE2-BS2.m-PTl.2 shows the connection path in the event that an (internal or external) fixed subscriber station FT2, starting from the second switching system PBX2, establishes a connection to the mobile terminal PT1, which is also the same as in the case illustrated in FIG. 1 is in the radio range of the "foreign" base station BS2.m. This connection path is represented as follows: FT2-PBX2 (TR2) -TRl / PBXl-REl-PBXl / TRl-TR2 / PBX2-RE2-BS2.m-PTl.
Die in den Fig. 1 und 2 anhand der Verbindungswege darge¬ stellten Fernmeldeverbindungen werden nach den erwähnten Roaming-Prozeduren durchgeführt. Jede Basisstation BSl.l, ...BSl.n BS2.1,...BS2.m identifiziert die in ihrem Funk¬ bereich befindlichen mobilen Endgeräte PTl,... anhand der jeweiligen Identifizierungsinformation. Ändert das Endge¬ rät PTl beispielsweise seinen Ort aus dem Funkbereich beispielsweise der ihm zugeordneten Basisstation BSl.l in den Funkbereich von BS2.m, so meldet diese Basisstation BS2.m die momentane Anwesenheit des Endgeräts PTl an die diesem Endgerät PTl fest zugeordnete erste Funkvermitt¬ lungseinheit REl. Hierzu greift die Steuerung CRE2 der Funkvermittlungseinheit RE2 auf entsprechende Informatio¬ nen zu, die in dem Speicher MRE2 abgelegt sind und stellt eine Verbindung zu der ersten Funkvermittlungseinheit REl her, wo diese Information im Speicher MRE1 abgelegt wird. Diese Signalisierungsdaten-Verbindungen zwischen RE2 und REl werden wie anhand der Figuren 1 und 2 für Sprach- bzw. Nutzdatenverbindungen dargestellt über PBX2 und PBXl her¬ gestellt; alternativ werden die Signaisierungsdaten über eine separate Datenleitung L-V.24 (Fig. 3) übertragen.The telecommunications connections shown in FIGS. 1 and 2 on the basis of the connection paths are carried out according to the roaming procedures mentioned. Each base station BSl.l, ... BSl.n BS2.1, ... BS2.m identifies the mobile terminals PT1, ... located in its radio area on the basis of the respective identification information. If the terminal PT1 changes its location, for example, from the radio range, for example from the base station BS1.1 assigned to it, to the radio range from BS2.m, then this base station BS2.m reports the current presence of the terminal PT1 to the first radio switch permanently assigned to this terminal PT1 ¬ development unit REl. For this purpose, the controller CRE2 of the radio switching unit RE2 accesses the corresponding information that is stored in the memory MRE2 and establishes a connection to the first radio switching unit RE1, where this information is stored in the memory MRE1. These signaling data connections between RE2 and RE1 are established as shown in FIGS. 1 and 2 for voice or user data connections via PBX2 and PBXl; alternatively, the signaling data are transmitted via a separate data line L-V.24 (Fig. 3).
Aufgrund der im Speicher MRE1 abgelegten Information wer¬ den die in den Fig. 1 und 2 dargestellten Fernmeldeverbin¬ dungen in REl zu der ersten Vermittlungsanlage PBXl umge¬ leitet.On the basis of the information stored in the memory MRE1, the telecommunication connections shown in FIGS. 1 and 2 are redirected in RE1 to the first switching system PBX1.
Fig. 3 veranschaulicht die Handover-Prozeduren im Rahmen der erfindungsgemäßen Anordnung. Handover-Prozeduren ver¬ folgen das Ziel, die Umschaltung von bisher genutztem Ver¬ bindungsweg über REl zu neuem Weg über RE2 bei Funkbe- reichswechsel unterbrechungsfrei zu gestalten. Eine Unter¬ brechung des Übertragungsweges entsteht durch unterschied- liehe Laufzeiten der Meldungen für die Steuerung der Um¬ schaltung. Diese Signalisierungsmeldungen werden zwischen mobilem Endgerät PTl und den Funkbereichseinheiten REl und RE2 ausgetauscht.3 illustrates the handover procedures in the context of the arrangement according to the invention. Handover procedures pursue the goal of making the switchover from the previously used connection path via RE1 to the new path via RE2 without interruption when changing the radio range. The transmission path is interrupted by different the run times of the messages for the control of the switchover. These signaling messages are exchanged between the mobile terminal PT1 and the radio area units RE1 and RE2.
Der Vermeidung einer hörbaren Unterbrechung beim Handover dient das zeitweise Broadcast-Senden über alten und neuen Verbindungsweg (über REl und RE2) während der Phase des Wegeumschaltens. Diese Handover-Prozeduren umfassen fol¬ gende Schritte:To avoid an audible interruption during the handover, broadcast broadcasting via the old and new connection path (via RE1 and RE2) is used temporarily during the phase switching phase. These handover procedures include the following steps:
1. Bei einem Ortswechsel des mobilen Endgeräts PTl aus dem Funkbereich der Funkvermittlungseinheit REl zur Funk¬ vermittlungseinheit RE2 übermittelt das Endgerät PTl eine Handover-Anforderung über die Basisstation BS2.m an die Funkvermittlungseinheit RE2;1. When the mobile terminal PT1 changes location from the radio range of the radio switching unit RE1 to the radio switching unit RE2, the terminal PTl transmits a handover request via the base station BS2.m to the radio switching unit RE2;
2. ausgelöst durch das Absetzen der Handover-Anforderung stellt das Endgerät PTl eine Verbindung über die Basis¬ station BS2.m zur zweiten Funkvermittlungseinheit RE2 her und geht in den sogenannten Broadcast-Sendebetrieb zu den Funkvermittlungsstellen RE1,RE2;2. triggered by issuing the handover request, the terminal PT1 establishes a connection via the base station BS2.m to the second radio switching unit RE2 and goes into the so-called broadcast transmission mode to the radio switching centers RE1, RE2;
3. die Funkvermittlungseinheit RE2 baut eine Verbindung zur ersten Funkvermittlungseinheit REl auf, die einer teilnehmerinitiierten Verbindung entspricht;3. the radio switching unit RE2 establishes a connection to the first radio switching unit RE1, which corresponds to a subscriber-initiated connection;
4. REl geht nach Aufbau der Verbindung in den Broadcast- Sendebetrieb auch zu RE2;4. RE1 also goes to RE2 after the connection to broadcast transmission has been established;
5. wenn RE2 die Bestätigung des Verbindungsaufbaus RE2- RE1 erhält, befindet sich REl schon im Broadcast- Sendebetrieb;5. when RE2 receives the confirmation of the connection setup RE2-RE1, RE1 is already in broadcast transmission mode;
6. darauf sendet RE2 über BS2 zum Endgerät PTl die Bestä- tigungsmeldung, daß der neue Weg über RE2 aufgebaut ist;6. RE2 then sends the confirmation message via BS2 to the terminal PT1 that the new path has been set up via RE2;
7. das Endgerät PTl beendet das Parallel-Senden zur Basis- st'ation BSl.l, REl beendet ebenfalls das Parallel- Senden zu BSl.l und die Verbindung über BS1 wird abge- baut. Der Vorteil der erfindungsgemäßen Prozedur für Handover zwischen zwei unterschiedlichen Funkvermittlungseinheiten REl und RE2 liegt darin, daß die Steuerung der ISDN-Tele¬ kommunikationsanlage für Handover keine spezifischen Funk- tionen zu erbringen hat. Die Verbindung zwischen den Funk¬ vermittlungseinheiten REl und RE2 als Teil der Gesamtver¬ bindung zwischen FTl und PTl entspricht einer ISDN-Verbin¬ dung, die von ortsfesten Teilnehmern eines Vermittlungs¬ systems mit mehreren Telekommunikationsanlagen initiiert wird.7. the terminal PTl ends the parallel transmission to base st 'ation BSl.l, REI also stops the parallel transmission to BSl.l and the connection via BS1 builds off. The advantage of the procedure according to the invention for handover between two different radio switching units RE1 and RE2 is that the control of the ISDN telecommunication system for handover does not have to perform any specific functions. The connection between the radio switching units RE1 and RE2 as part of the overall connection between FTl and PTl corresponds to an ISDN connection that is initiated by stationary subscribers of a switching system with several telecommunication systems.
Die Funkvermittlungseinheiten RE1,RE2 können mit einer separaten Datenleitung L-V.24 verbunden sein, wobei das den Steuerungen CRE1,CRE2 der Funkvermittlungseinheiten REl, RE2 zugeordnete Steuerungsprogramm in der Weise ausgestaltet ist, daß Signalisierungsdaten, die die aktuellen Orte mobiler Endgeräte PTl,... bezeichnen, über diese separate Datenleitung übertragen werden. The radio switching units RE1, RE2 can be connected to a separate data line LV.24, the control program assigned to the controllers CRE1, CRE2 of the radio switching units RE1, RE2 being designed in such a way that signaling data indicating the current locations of mobile terminals PT1, ... designate to be transmitted over this separate data line.

Claims

Patentansprüche Claims
1. Anordnung zur Herstellung von Fernmeldeverbindungen in einem Kommunikationssystem, bestehend aus mindestens einer ersten Vermittlungsanlage (PBXl) und einer zweiten Ver¬ mittlungsanlage (PBX2), wobei der ersten Vermittlungsan¬ lage (PBXl) eine erste Funkvermittlungseinheit (REl) und der zweiten Vermittlungsanlage (PBX2) eine zweite Funkver¬ mittlungseinheit (RE2) zugeordnet ist, wobei die erste und die zweite Funkvermittlungseinheit (RE1,RE2) mit jeweils mindestens einer Basisstation (BSl.l, — ,BSl.n; BS2.1,..., BS2.2m) verbunden ist, wobei mobile Endgeräte (PTl,...) aufgrund einer endgeräteindividuellen Identifizierungsin¬ formation genau jeweils einer Funkvermittlungseinheit (REl, RE2) als originärer Funkvermittlungseinheit zugeordnet sind, wobei jeder Funkvermittlungseinheit (RE1,RE2) je¬ weils eine Steuerung (CRE1,CRE2) mit einem Steuerungspro¬ gramm zur Herstellung von Fernmeldeverbindungen zugeordnet ist, an denen jeweils mindestens 1 mobiles Endgerät (PTl) beteiligt ist, d a d u r c h g e k e n n z e i c h n e t , daß das den Steuerungen (CRE1,CRE2) der Funkvermittlungs¬ einheit (RE1,RE2) zugeordnete Steuerungsprogramm in der Weise ausgestaltet ist, daß die Fernmeldeverbindungen unabhängig vom Ort des an der jeweiligen Fernmeldeverbin¬ dung beteiligten mobilen Endgeräts (PTl) über die, diesem Endgerät (PTl) aufgrund der Identifizierungsinformation zugeordneten originären Funkvermittlungseinheit (REl) hergestellt werden.1. Arrangement for establishing telecommunication connections in a communication system, consisting of at least a first switching system (PBX1) and a second switching system (PBX2), the first switching system (PBX1) having a first radio switching unit (RE1) and the second switching system ( PBX2) is assigned a second radio switching unit (RE2), the first and second radio switching units (RE1, RE2) each having at least one base station (BS1.1, -, BS1.1; BS2.1, ..., BS2 .2m) is connected, with mobile terminals (PT1, ...) being assigned exactly one radio switching unit (RE1, RE2) as the original radio switching unit due to a terminal-specific identification information, each radio switching unit (RE1, RE2) each having a controller (CRE1, CRE2) is associated with a control program for establishing telecommunications connections, in each of which at least 1 mobile terminal (PT1) participates is characterized in that the control program assigned to the controls (CRE1, CRE2) of the radio relay unit (RE1, RE2) is designed in such a way that the telecommunication connections are independent of the location of the mobile terminal (PT1) involved in the respective telecommunication connection. via the original radio switching unit (RE1) assigned to this terminal (PT1) on the basis of the identification information.
2. Anordnung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß das den Steuerungen (CRE1,CRE2) der Funkvermittlungs¬ einheiten (RE1,RE2) zugeordnete Steuerungsprogramm in der Weise ausgestaltet ist, daß die Fernmeldeverbindungen zwi¬ schen den beteiligten Vermittlungsanlagen (PBX1,PBX2) wie teilnehmerinitiierte Fernmeldeverbindungen gebildet werden. 2. Arrangement according to claim 1, characterized in that the control program (CRE1, CRE2) of the Funkvermittlungs¬ units (RE1, RE2) assigned control program is designed in such a way that the telecommunications connections between the switching systems involved (PBX1, PBX2) as subscriber-initiated telecommunications connections are formed.
3. Anordnung nach einem der vorstehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß die Funkvermittlungseinheiten (RE1,RE2) mit einer separaten Datenleitung (L-V.24) verbunden sind, und daß das den Steuerungen (CRE1,CRE2) der Funkvermittlungsein¬ heiten (RE1,RE2) zugeordnete Steuerungsprogramm in der Weise ausgestaltet ist, daß Signalisierungsdaten, die aktuelle Orte mobiler Endgeräte (PTl,...) bezeichnen, über die separate Datenleitung (L-V.24) übertragen werden. 3. Arrangement according to one of the preceding claims, characterized in that the radio switching units (RE1, RE2) are connected to a separate data line (LV.24), and that the controls (CRE1, CRE2) of the radio switching units (RE1, RE2) assigned control program is designed in such a way that signaling data, which designate current locations of mobile terminals (PT1, ...), are transmitted via the separate data line (LV.24).
PCT/DE1993/001196 1993-01-04 1993-12-14 Arrangement for establishing telephone links in a cordless communications system by call transmission WO1994016531A1 (en)

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EP0667085A1 (en) * 1993-07-28 1995-08-16 Motorola, Inc. Method and apparatus for reducing an audio hole during handoff in a communication system
EP0667085A4 (en) * 1993-07-28 1999-02-03 Motorola Inc Method and apparatus for reducing an audio hole during handoff in a communication system.
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EP0760588A2 (en) * 1995-08-28 1997-03-05 Siemens Aktiengesellschaft Method and device for establishing telecommunication connections
EP0760588A3 (en) * 1995-08-28 1999-12-29 Siemens Aktiengesellschaft Method and device for establishing telecommunication connections
EP0762790A3 (en) * 1995-08-30 1999-11-24 Siemens Aktiengesellschaft Multi-cellular radio system with PBX and peripheral modules
EP0762790A2 (en) * 1995-08-30 1997-03-12 Siemens Aktiengesellschaft Multi-cellular radio system with PBX and peripheral modules
US6138015A (en) * 1995-08-30 2000-10-24 Siemens Aktiengesellschaft Multi-cell radio system with PBX periphery assemblies
DE19531999A1 (en) * 1995-08-30 1997-03-06 Siemens Ag Multi-cell radio system with PBX peripheral modules
EP0833530A2 (en) * 1996-09-26 1998-04-01 Siemens Aktiengesellschaft Call set-up method towards a wireless terminal linked to a communications network
EP0833530A3 (en) * 1996-09-26 1999-11-24 Siemens Aktiengesellschaft Call set-up method towards a wireless terminal linked to a communications network
EP1180905A1 (en) * 2000-08-18 2002-02-20 Samsung Electronics Co., Ltd. Method for providing roaming service among private mobile switching centers
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DE9300044U1 (en) 1993-05-19

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