WO1993020642A1 - Appareil et methode de desserte d'abonnes en radio-telephonie dans un environnement de lignes filaires - Google Patents

Appareil et methode de desserte d'abonnes en radio-telephonie dans un environnement de lignes filaires Download PDF

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Publication number
WO1993020642A1
WO1993020642A1 PCT/US1993/002783 US9302783W WO9320642A1 WO 1993020642 A1 WO1993020642 A1 WO 1993020642A1 US 9302783 W US9302783 W US 9302783W WO 9320642 A1 WO9320642 A1 WO 9320642A1
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WO
WIPO (PCT)
Prior art keywords
wireline
pbx
wireless
base
subscriber
Prior art date
Application number
PCT/US1993/002783
Other languages
English (en)
Inventor
Kenneth A. Felix
Morton Stern
John P. Lodwig
Original Assignee
Motorola Inc.
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 Motorola Inc. filed Critical Motorola Inc.
Publication of WO1993020642A1 publication Critical patent/WO1993020642A1/fr

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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 invention relates generally to communication systems and, more specifically, to interfacing wireless communication systems to wireline communication systems.
  • subscriber units i.e., cellular subscriber units, in-home/business wireless units, etc.
  • subscriber units i.e., cellular subscriber units, in-home/business wireless units, etc.
  • the goal for manufacturers of such phones, and also system operators, is to make these subscriber units more personal in nature.
  • PBX private branch exchange
  • the concept of a PBX is to use the PBX as a remotely located switch which specifically serves a predetermined user group.
  • a predetermined user group may be a company which prefers to have internal call routing performed instead of dialing to a PSTN switch and dialing back to a user within the same user group.
  • the PBX can be used to limit access to undesired destinations (for example, international calls) to specific individuals in the user group. Since the PBX has features and functions which mirror the PSTN switch, connection of typical wireline phones, and consequently service of such phones, is not interrupted by the addition of the PBX.
  • the protocol used for a wireline system is different than the protocol used for wireless system.
  • a base-unit, or base-station, employed in a wireless system cannot be directly connected to a PBX. Since the two protocols are different, the wireless system would not be able to obtain service in the wireline environment.
  • a communication system provides a wireless subscriber with service in a local telephone network.
  • the communication system is comprised of switch means for providing switching between a telephone network and the local telephone network, the switch means coupled to the telephone network and a wireline subscriber.
  • the communication system is also comprised of an interface means for interfacing between the switch means and a wireless subscriber, the interface means coupled to the switch means, the wireline subscriber, and the wireless subscriber.
  • the communication system is also comprised of base-station means for communicating with the wireless subscriber, the base-station means coupled to the interface means and the wireless subscriber.
  • FIG. 1 generally depicts, in block diagram form, wireless telephone service in a PBX wireline environment in accordance with the invention.
  • FIG. 2 generally depicts, in block diagram form, a wireless interface block which provides wireless telephone service in a PBX environment.
  • FIG. 3 generally depicts an alternate embodiment, in block diagram form, for providing wireless telephone service within a PBX wireline environment in accordance with the invention.
  • FIG. 4 generally depicts, in flow diagram form, a method of servicing wireless subscribers in a wireline environment in accordance with the invention.
  • FIG. 5 generally depicts, in flow diagram form, an alternate method of servicing wireless subscribers in a wireline environment in accordance with the invention.
  • FIG. 1 generally depicts service of wireless subscribers within a private branch exchange (PBX) wireline environment in accordance with the invention.
  • PBX private branch exchange
  • a PBX 103 is interconnected via trunk group 106 to a PSTN 101.
  • PBX 103 is further coupled to a group of wireline subscribers 112 via wireline group 109 employing a standard, wireline protocol.
  • This same wireline group 109 utilizing the wireline protocol, couples a wireless interface block (WIB) 115 to PBX 103.
  • WIB 115 serves as the interface which provides wireless telephone service to a wireless subscriber, for example subscriber 126, within a PBX wireline environment.
  • WIB 115 is coupled to a plurality of base-stations 120-122 and may also be coupled to wireline subscribers 112. Coupling between WIB 115 and base-stations 120-122 is accomplished via signalling links 118, which incorporates a wireless-related protocol, and subscriber links 119. As depicted in FIG. 1, base-stations 120-122 may be replaced by wireline subscribers 112 via subscriber links 119; however, subscriber links 119 are primarily reserved for base-stations 120-122.
  • Base- stations 120-122 are shown with a single antenna 130 in the preferred embodiment, antenna 130 is a distributed antenna network 125 having a plurality of independent antennas interconnected to each base-station 120-122.
  • FIG. 1 also depicts a predetermined PBX wireline user group 100 for which service is provided by PBX 103.
  • wireline subscribers 112 and wireless subscribers 126 are members of a predetermined user group 100 in that they are all served by PBX 103.
  • FIG. 1 has its most beneficial use in, inter alia, office buildings, factories, sports arenas, exposition centers, etc.
  • an office building may be served by its own PBX 103, such as a PBX typically used to serve wireline subscribers 112.
  • PBX typically used to serve wireline subscribers 112.
  • PBX typically used to serve wireline subscribers 112.
  • PBX typically used to serve wireline subscribers 112.
  • PBX typically used to serve wireline subscribers 112.
  • PBX wireline subscribers 112 may require service.
  • distributed antenna network 125 were employed, for example, on one floor of the office building, that floor may be capable of servicing all wireless subscribers within that particular area.
  • EMX 102 may be of the type available from Motorola, Inc., and described in Motorola Instruction Manual No.
  • EMX 102 is implemented to provide cellular switching functions within a cellular network which is located outside the PBX wireline environment. EMX 102 is further coupled to a cellular base- station 104; one conventional cellular base-station 104 may employ transmitters and receivers of the type described in Motorola Instruction Manual No. 68P81058E32-A published by Motorola Service Publications, Schaumburg, IL., in 1989.
  • wireless subscriber 126 has the capability to communicate with cellular base-station 104 when not communicating with one of base-stations 120-122 within the PBX wireline environment.
  • FIG. 2 generally depicts, in block diagram form, WIB 115.
  • wireline group 109 enters a time slot interchange (TSI) 218.
  • TSI 218 may be a time slot interchange as that having part number 8980, and manufactured by MITEL® (MITEL is a registered trademark of MITEL Corp., a subsidiary of British Telecom).
  • MITEL is a registered trademark of MITEL Corp., a subsidiary of British Telecom
  • TSI 218 is also coupled to subscriber links 119 which interconnects WIB 115 to base-stations 120-122.
  • TSI 218 is interconnected to I O controller 215 which performs interfacing tasks between processor 206 and TSI 218.
  • Processor 206 orchestrates all operation within WIB 115, and in the preferred embodiment is a Motorola 68302.
  • processor 206 is coupled to a data store 209 which stores, inter alia, slot-to-slot connection data and subscriber line-to-wireless subscriber number translation.
  • processor 206 is coupled to a program store 212 which stores programs used by processor 206 to perform, inter aha, TSI control, signal digit analysis, and ring detection.
  • Processor 206 is coupled, via I O controller 203, to . a signalling interface 200.
  • Signalling interface 200 provides the _- requisite interface for signalling links 118 to inter-couple WIB 115 to base-stations 120-122.
  • Signalling interface 200 accepts signalling information, from processor 206, from a selected line from wireline group 109, and uses this information for its own control and for generating the appropriate signalling messages for subscribers, for example, wireless subscriber 126. In addition, signalling interface 200 transmits and receives information to/from base- stations 120-122. This data is primarily information which will be sent or has been received by a control channel, but the information content may be expanded as required. In the preferred embodiment, the type of signalling used in the system is analogous to that used in the Advance Mobile Phone Service (AMPS) cellular radiotelephone system. In alternate embodiments, signalling links 118 may carry information using a messaged based protocol between signalling interface 200 and base-stations 120-122.
  • AMPS Advance Mobile Phone Service
  • Signalling interface 200 may be realized by employing any conventional micro-computer system. As such, in this embodiment, signalling interface 200 would also be able to maintain call records and statistics as required based upon the passage of information.
  • Base-stations 120-122 of FIG. 1 each transmit overhead information, pages, and appropriate channel assignments to wireless subscribers, such as wireless subscriber 126. In the reverse direction (from the base-stations 120-122 to WIB 115, base- stations 120-122 receive page responses and call origination requests from wireless subscribers.
  • Signalling links 118 can carry the above-mentioned information in the actual protocol message form as required by the wireless system, or it can be in any of the data link protocols for example high-level data link protocol (HDLC).
  • HDLC high-level data link protocol
  • Wireless subscribers employed within the wireless system are identical to that used in the AMPS cellular radiotelephone system, and in fact are compatible with both (1) the system depicted in FIG. 1 and described in the preferred embodiment and (2) the existing AMPS cellular radiotelephone system, comprised of at least EMX 102 and cellular base-station 104, outside the PBX wireline environment.
  • the preferred embodiment is the AMPS technology, which is an analog technology; in alternate embodiments, both wireless subscribers 126 and base-stations 120-122 may be compatible with, but are not limited to, a time-division multiple access (TDMA) cellular radiotelephone system (EMX 102 and cellular base-station 104) or a code-division multiple- access (CDMA) cellular radiotelephone system (EMX 102 and cellular base-station 104) . Since the cellular radiotelephone system is outside the PBX wireline environment, no change in WIB 115 is required as long as the same interface over signalling links 118 is used. If a different signalling protocol is used, for example by employing a different type of cellular radiotelephone system, the communication system of the preferred embodiment can be adapted by modifying signalling interface 200.
  • TDMA time-division multiple access
  • CDMA code-division multiple- access
  • WIB 115 has the capability to monitor the data stream of individual trunks from trunk group 106.
  • trunk group 106 consists of a 24 channel PCM 1.544 Mbps (DS1) service.
  • DS1 PCM 1.544 Mbps
  • the least significant bit of every sixth DSO slot contains signalling information pertaining to trunk seizure, called number, disconnect, etc.
  • This signalling information is assembled in message format and is transferred to signalling interface 200 using a protocol such as HDLC.
  • the message content can be set-up in a "1" or "0" format for interpretation in signalling interface 200.
  • Call delivery to wireless subscriber 126 is as follows in accordance with the invention.
  • WIB 115 detects a seizure (ring signal) for wireless subscriber 126; determines the corresponding phone number of wireless subscriber 126; and passes this information to 8
  • Signalling interface 200 via I/O controller 203 in the form of the actual signalling protocol (e.g. the HDLC link protocol).
  • Signalling interface 200 then generates a paging message which is sent, via signalling links 118, to all base-stations 120-122 for transmission to wireless subscriber 126. If one of base-stations 120-122 is busy han ling an existing call, the busy base-station will discard the information. If a base-station 120-122 is idle, it will transmit the page as part of a control channel stream along with a system identification code to which- wireless subscriber 126 attaches an association. All base-stations 120-122 may carry the same identifier, or different base-stations may carry unique identifiers so as to differentiate a service or coverage areas.
  • the system also supports sleep-mode operations for idle subscriber units; in sleep-mode, the overhead data stream is included as part of the control channel stream, and carries the organizational information for this operation.
  • PBX 103 While signalling information is being routed to base- stations 120-122, at the same time PBX 103 receives the information from the PSTN as it would for any wireline call, and sets-up the call accordingly. This information is routed through
  • TSI 218 to the base-stations 120-122 via subscriber links 119.
  • base-stations 120-122 intercept the ring signal and monitor the radio-frequency (RF) channel for a response to the page.
  • RF radio-frequency
  • wireless subscriber 126 Upon receipt of the page, wireless subscriber 126 responds on a particular BF channel corresponding to a particular idle base-station 120-122.
  • the idle base-station 120, 121, or 122 which receives the response from wireless subscriber 126 will direct WIB 115 to assign the appropriate line from subscriber links 119 to be connected to the appropriate line from wireline group 109 via TSI 218.
  • wireless subscriber 126 At such time that the now-communicating base station 120, 121, or 122 sends an alert to wireless subscriber 126, wireless subscriber 126 will receive the ring signal. When wireless subscriber 126 answers the call, the now communicating base-station 120, 121, or 122 will send an off-hook signal by way of subscriber links 119 (via WIB 115) to PBX 103 so as to provide the final connection and establish communication from the originator to wireless subscriber 126.
  • Call origination from wireless subscriber 126 to a destination is accomplished as follows in accordance with the invention.
  • wireless subscriber 126 When not in use, wireless subscriber 126 resides on an idle channel-that is transmitting idle protocol. Wireless subscriber 126 monitors the protocol until such time as the protocol is lost or wireless subscriber 126 begins placing a call. At such time as base- stations 120, 121, or 122 detect an origination attempt by wireless subscriber 126, the corresponding base-station 120, 121, or 122 will drop the idle channel protocol and connect through to PBX 103 via WIB 115, and more specifically, signalling links 118.
  • PBX 103 will prepare to receive the call from wireless subscriber 126 by connecting subscriber 126 from wireline group 109 to base- station 120, 121, or 122 (which received the origination attempt) via the appropriate line from subscriber links 119.
  • wireless subscriber 126 can send dialing information in one of two ways.
  • the origination message sent by wireless subscriber 126 does not contain calling information and the origination message simply seizes an RF channel for a call.
  • the corresponding base-station 120, 121, or 122 connects to PBX 103 by way of subscriber links 119 and waits for a dial-tone.
  • wireless subscriber 126 Upon hearing a dial-tone, wireless subscriber 126 begins dialing using any standard dialing protocol, such as dual-tone multi-frequency (DTMF).
  • DTMF dual-tone multi-frequency
  • a base-station 120, 121 or 122 receives all the necessary calling information in the origination message.
  • the corresponding base-station 120, 121 or 122 then goes off-hook.
  • the corresponding base-station 120, 121 or 122 Upon receipt of a dial-tone from PBX 103, the corresponding base-station 120, 121 or 122 generates the appropriate DTMF signals.
  • the corresponding base-station 120, 121 or 122 couples to wireless 20
  • the call may proceed as a normal wireline call.
  • FIG. 3 generally depicts an alternate embodiment for providing wireless telephone service within a PBX wireline environment in accordance with the invention.
  • one or more of the trunk groups 106 feeding PBX 103 route through WIB 115.
  • This particular trunk group is depicted by trunk group 300 in FIG. 3.
  • Operation of the system depicted in FIG. 3 is as follows. Information entering WIB 115 from one trunk of trunk group 300 has a portion of the information monitored. WIB 115 then directs the DS1 data stream to one trunk of trunk group 302 feeding PBX 103. In this mode, WIB 115 is transparent to PBX 103.
  • PBX 103 activates the proper terminating subscriber line from subscriber links 119, which is then terminated in one of base-stations 120- 122.
  • WIB 115 knows which subscriber line of subscriber ⁇ m ⁇ - ⁇ 119 will be assigned from PBX 103 due to the trunk/line association within PBX 103.
  • This association can be as l m ting as having a unique trunk/line association.
  • Such an association is known as a single member trunk group. In future embodiments, the single member trunk group may be 11
  • signalling information is sent from WIB 115, via signalling links 118, to base-stations 120- 122 as described for the embodiment of FIG. 1.
  • additional signalling information is transmitted to wireless subscriber 126.
  • t ⁇ notify subscriber 126 of the base-station 120, 121 or 122 which wireless subscriber 126 is required to communicate with due to the trunk/line association in WIB 115. Because of the hard-wired nature of the system, wireless subscriber 126 does not have a choice of base-stations 120, 121, or 122 with which to communicate. In addition to this restriction, due to the location of WIB 115, all the features and functions of PBX 103 are not fully realized.
  • FIG. 4 generally depicts, in flow diagram form, a method of servicing wireless subscribers in a wireline environment in accordance with the invention.
  • the method starts, at step 400, by providing, at step 402, telephone service . to at least one predetermined user group 100 via a PBX wireline.
  • the system identifies, at step 404, the wireless subscriber based on originator information input from the PBX wireline.
  • the system then routes, at step 406, the originator information from the PBX to one of a plurality of base-stations 120-122 for transmission to the identified wireless subscriber and determines, at step 408, to which base-stations 12
  • the system then switches, at step 410, the voice signal received over the PBX wireline to the determined base-station 120, 121, or 122.
  • FIG. 5 generally depicts, in flow diagram form, an alternate method of servicing wireless subscribers in a wireline environment in accordance with the invention.
  • the method starts, at step 500, by providing, at step 502, telephone, service to at least one predetermined user group 100 via a PBX wireline.
  • the system determines, at step 504, which base-station 120, 121, or 122 corresponds to the PBX wireline having originator information conveyed thereon.
  • the system monitors, at step 506, a portion of the originator information; and routes, at step 508, the monitored portion of originator information from the PBX wireline to the base-station determined in step 504 for transmission to wireless subscriber
  • the system then instructs, at step 510, wireless subscriber 126 to communicate with the determined base-station.
  • Base-stations 120-122 and wireless subscriber 126 are not limited to radiotelephone applications.
  • wireless subscriber 126 may be a wireless unit for transferring data from a computer, while base-stations 120-122 would act in a similar manner described, but would be specifically used for transferring data to from the wireline system. If this were the case, operation of call connection, from originator to wireless or wireless to destination, would be similar to that described.
  • the only difference between the radiotelephone application and the data application would be the type of signalling employed by signalling interface 200. All other aspects of the communication system would essentially be the same.
  • base-stations 120-122 could be a combination of base-stations for both radiotelephone applications and data transfer applications. Again, only signalling interface 200 would be required to change. 13

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

Abstract

Bloc d'interface de radiotéléphonie (115) permettant d'assurer un service de radiotéléphonie à une série d'abonnés dans un milieu de lignes filaires de centre urbain automatique public. Le bloc d'interface de radiotéléphonie (115) fournit les informations de signalisation nécessaires aux stations de base (120-122) du système de radiotéléphonie par l'intermédiaire d'un circuit de liaison de tranches de temps (218), d'un processeur (206) et d'une interface de signalisation (200). En faisant intervenir un bloc d'interface de radiotéléphonie (115) entre le centre urbain automatique public (103) et le système de radiotéléphonie, la radiotéléphonie est assurée dans un environnement de centre urbain automatique public à lignes filaires tout en conservant l'ensemble des caractéristiques et des fonctions de ce centre urbain automatique public (103).
PCT/US1993/002783 1992-04-03 1993-03-25 Appareil et methode de desserte d'abonnes en radio-telephonie dans un environnement de lignes filaires WO1993020642A1 (fr)

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US86270292A 1992-04-03 1992-04-03
US862,702 1992-04-03

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0583137A2 (fr) * 1992-08-11 1994-02-16 AT&T Corp. Architecture pour système de télécommunications cellulaire "sans-fil"
EP0589619A2 (fr) * 1992-09-25 1994-03-30 AT&T Corp. Architecture pour système de télécommunication sans fil
GB2301755A (en) * 1995-06-02 1996-12-11 Dsc Communications Multiline wireless transmission in a wireless telecommunications system
GB2301756A (en) * 1995-06-02 1996-12-11 Dsc Communications Multi-channel digital data transmission in a wireless telecommunications system
US5924030A (en) * 1995-09-29 1999-07-13 Nokia Mobile Phones Limited Cellular extension of a fixed communications network
FR2790176A1 (fr) * 1999-02-23 2000-08-25 Cit Alcatel SERVEUR POUR FAIRE COMMUNIQUER n PAIRES DE MACHINES, ET RESEAU DE TELECOMMUNICATION PRIVE DECT COMPORTANT UN TEL SERVEUR

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US4748655A (en) * 1984-07-25 1988-05-31 Racal Research Limited Portable telephones
US4881271A (en) * 1987-03-20 1989-11-14 Hitachi, Ltd. Portable wireless communication systems
US4955050A (en) * 1988-04-01 1990-09-04 Hitachi, Ltd. System configuration of wireless PBX and communication method therefor
US5054042A (en) * 1988-03-22 1991-10-01 Thomson-Csf Device for the setting up and routing of telephone calls between subscribers of a radio network and/or of a wired telephone network
US5170488A (en) * 1989-12-15 1992-12-08 Hitachi, Ltd. Method of switching speech path in radiotelephone system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4748655A (en) * 1984-07-25 1988-05-31 Racal Research Limited Portable telephones
US4881271A (en) * 1987-03-20 1989-11-14 Hitachi, Ltd. Portable wireless communication systems
US5054042A (en) * 1988-03-22 1991-10-01 Thomson-Csf Device for the setting up and routing of telephone calls between subscribers of a radio network and/or of a wired telephone network
US4955050A (en) * 1988-04-01 1990-09-04 Hitachi, Ltd. System configuration of wireless PBX and communication method therefor
US5170488A (en) * 1989-12-15 1992-12-08 Hitachi, Ltd. Method of switching speech path in radiotelephone system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0583137A2 (fr) * 1992-08-11 1994-02-16 AT&T Corp. Architecture pour système de télécommunications cellulaire "sans-fil"
EP0583137A3 (en) * 1992-08-11 1994-09-14 At & T Corp Architecture for a cellular wireless telecommunication system
EP0589619A2 (fr) * 1992-09-25 1994-03-30 AT&T Corp. Architecture pour système de télécommunication sans fil
EP0589619A3 (en) * 1992-09-25 1994-09-28 At & T Corp Architecture for a wireless telecommunication system
GB2301755A (en) * 1995-06-02 1996-12-11 Dsc Communications Multiline wireless transmission in a wireless telecommunications system
GB2301756A (en) * 1995-06-02 1996-12-11 Dsc Communications Multi-channel digital data transmission in a wireless telecommunications system
GB2301755B (en) * 1995-06-02 2000-01-12 Dsc Communications Multiline wireless transmission in a wireless telecommunications system
GB2301756B (en) * 1995-06-02 2000-01-19 Dsc Communications Multi-channel digital data transmission in a wireless telecommunication system
US5924030A (en) * 1995-09-29 1999-07-13 Nokia Mobile Phones Limited Cellular extension of a fixed communications network
FR2790176A1 (fr) * 1999-02-23 2000-08-25 Cit Alcatel SERVEUR POUR FAIRE COMMUNIQUER n PAIRES DE MACHINES, ET RESEAU DE TELECOMMUNICATION PRIVE DECT COMPORTANT UN TEL SERVEUR
EP1032225A1 (fr) * 1999-02-23 2000-08-30 Alcatel Serveur pour faire communiquer n paires de machines, et réseau de télécommunication privé DECT comportant un tel serveur
US6526437B1 (en) 1999-02-23 2003-02-25 Alcatel Server for enabling n pairs of machines to communicate, and a dect private telecommunications network including such a server

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AU3967893A (en) 1993-11-08
MX9301919A (es) 1994-08-31

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