[go: up one dir, main page]

WO1999037036A1 - Autocommutateur prive (pbx) sans fil - Google Patents

Autocommutateur prive (pbx) sans fil Download PDF

Info

Publication number
WO1999037036A1
WO1999037036A1 PCT/US1999/000845 US9900845W WO9937036A1 WO 1999037036 A1 WO1999037036 A1 WO 1999037036A1 US 9900845 W US9900845 W US 9900845W WO 9937036 A1 WO9937036 A1 WO 9937036A1
Authority
WO
WIPO (PCT)
Prior art keywords
private branch
branch exchange
information
wireless
pbx
Prior art date
Application number
PCT/US1999/000845
Other languages
English (en)
Inventor
Priscilla Marilyn Lu
Original Assignee
Interwave Communications, 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 Interwave Communications, Inc. filed Critical Interwave Communications, Inc.
Priority to CA002317731A priority Critical patent/CA2317731A1/fr
Priority to AU21167/99A priority patent/AU751347B2/en
Priority to AT99901480T priority patent/ATE217128T1/de
Priority to DE69901387T priority patent/DE69901387T2/de
Priority to EP99901480A priority patent/EP1060569B1/fr
Publication of WO1999037036A1 publication Critical patent/WO1999037036A1/fr

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 present invention relates to a wireless private branch exchange.
  • the invention relates to a system and method to enable private branch exchanges to communicate with external telephone networks using a wireless communication network, to increase communication capacity of the private branch exchange in a cost efficient manner.
  • PSTN public switched telephone network
  • wireline telephony allows two users to communicate with each other only if there is a physical wire connection between the two users.
  • the necessity of a physical connection between users imposes several restrictions on users of PSTN systems.
  • the capacity of users that a PSTN can service at a given time is restricted by the number of physical lines existing between users.
  • the capacity of a PSTN can be increased only by installing/laying new lines to support additional users — a solution that is very expensive and time consuming.
  • the capacity of a PSTN is usually capped by economic considerations. It would therefore be highly desirable to have a communication network whose capacity can be increased in a cost efficient manner.
  • PSTN systems Another problem with existing PSTN systems is the manner in which new lines are laid, usually below the ground. This involves extensive digging of roads and property. In many instances, this is not a viable option. This is especially true in populated urban areas like cities and suburbs where the demand for communication services is very high but there is very little land available for laying new PSTN lines. Furthermore, since PSTN lines stretch out over long distances between users, their maintenance is very expensive and time consuming. Thus, there is a need for a communication system which not only increases the communication capacity but is also easy to install and maintain.
  • a PBX is generally a telephone exchange serving a single organization, for example, an office building having a switchboard and associated equipment, usually located on the user's premises.
  • a PBX is generally connected to a plurality of private internal telephone users (called terminals) located in a typical office environment. The PBX provides for internal call switching between one or more of these terminals.
  • the PBX is also connected to external telephone networks via PSTN lines. The PBX uses the PSTN lines to perform call routing between a PBX terminal and an external telephone network terminal.
  • a wireless communication network for example GSM
  • the telephone is substituted by a mobile station (MS) or a handset.
  • the geographical area serviced by the cellular network is divided in cells — each cell being served by a base transceiver station (BTS).
  • BTS base transceiver station
  • Information is exchanged between the mobile station and the BTS over a radio interface.
  • the BTS in turn communicates with a mobile services switching center (MSC) which performs the basic switching function in the wireless network.
  • the MSC also acts as a gateway between the wireless network and other external communication networks — performing interconnectivity and switching functions between GSM and the other external telephone networks.
  • the invention relates to a system and method to enable a private branch exchange to increase its capacity in a cost efficient manner by communicating with external telephone networks using a wireless communication network.
  • Exemplary embodiments are provided for use with the Global Systems for Mobile Communication (GSM) protocol and can be applied to other cellular communication and digital technologies.
  • GSM Global Systems for Mobile Communication
  • a wireless private branch exchange comprises a handset transceiver station (HTS) coupled to a private branch exchange serving a plurality of terminals.
  • HTS handset transceiver station
  • the handset transceiver station receives inbound information transmitted by the wireless communication network.
  • the handset transceiver station decodes the inbound information and performs protocol conversion from a GSM format to an ISDN format supported by the PBX.
  • the inbound information is then forwarded to the PBX which routes it to an appropriate terminal.
  • the handset transceiver station receives outbound information from the PBX to be routed to an external telephone network terminal.
  • the handset transceiver station converts the outbound information from ISDN format to GSM format.
  • the handset transceiver station then encodes the outbound information and transmits it to the wireless communication network.
  • the outbound information is then routed by the wireless communication network to the destination external telephone network terminal.
  • the HTS comprises an antenna, a receiver, a transmitter, a processor and a protocol converter.
  • the receiver receives inbound information and the transmitter transmits outbound information.
  • the processor is coupled to the receiver and transmitter and is responsible for decoding inbound information and encoding outbound information.
  • the protocol converter is responsible for information format conversions between GSM and ISDN.
  • the PBX is connected to the HTS and also to an external PSTN network via a physical link. In this embodiment, the PBX is configured to route the call over the radio interface only if the wired PSTN interface is already operating at full capacity. This allows the PBX to make optimal use of existing PSTN links and the wireless interface.
  • the concurrent capacity of the wireless private branch exchange can be increased by using a plurality of HTSs, each with their own receive and transmit cycles.
  • the ability to add additional HTSs as and when required provides the PBX administrator with an easy and cheap way to increase the communication capacity of the PBX.
  • Advantages of the invention include the ability to increase the communication capacity of a PBX without the need to install additional PSTN lines. Furthermore, in one embodiment of the invention the PBX can make optimal use of existing PSTN links and the wireless interface. Since the equipment required for the present invention is localized at the user's site, it is easy to install and maintain. The present invention provides the PBX user with the flexibility to increase the capacity of the PBX when required.
  • FIG. 2 is a flowchart showing the steps involved in inbound information processing for an embodiment of the invention
  • FIG. 3 is a flowchart showing the steps involved in outbound information processing for an embodiment of the invention.
  • Figure 4 is a block diagram depicting the internal structure of a handset transceiver station for an embodiment of the invention.
  • FIG. 5 depicts an alternate embodiment of the present invention
  • Figure 6 depicts another alternate embodiment of the present invention.
  • the present invention relates to a wireless private branch exchange.
  • the invention relates to a system and method to enable private branch exchanges to increase their communication capacity in a cost efficient manner by communicating with external telephone networks using a wireless communication network.
  • Exemplary embodiments are provided for use with the Global Systems for Mobile Communication (GSM) protocol and can be also applied to other wireless communication and digital technologies.
  • GSM Global Systems for Mobile Communication
  • the present invention is described with reference to various embodiments incorporating specific configurations and protocols. Those skilled in the art will appreciate that various changes and modifications can be made to the embodiments while remaining within the scope of the present invention.
  • the term information includes voice, data or both.
  • a wireless communication network 102 using the GSM protocol communicates with a wireless private branch exchange 104 via the radio interface.
  • the wireless communication network 102 is a conventional wireless network including a base transceiver station 108 (BTS) connected to a base station controller 110 (BSC), which in turn is connected to a mobile services switching center 112 (MSC).
  • BTS 108 using antenna 124 communicates via a wireless interface with mobile stations or handsets which provide an interface through which end users can access the wireless network.
  • the mobile stations or handsets are replaced by the wireless private branch exchange 104.
  • MSC 112 acts as a gateway between the wireless communication network 102 and external telephone networks 106. Thus, MSC 112 is responsible for providing interconnectivity between the wireless network 102 and other external networks 106.
  • GSM Global System for Mobile communications
  • the wireless private branch exchange 104 comprises an antenna 114, a handset transceiver station 116 (HTS) and a private branch exchange 118 (PBX) connected to a plurality of terminals 122.
  • Terminals 122 serviced by PBX 118 include telephones, fax terminals, and computers.
  • PBX 118 supports functions performed by conventional PBX systems, such as call routing, call redirection, call forwarding, and call waiting.
  • PBX 118 supports the ISDN protocol and is coupled to HTS 116 via ISDN link 120.
  • PBX 118 can also support other telephone network protocols known to those skilled in the art.
  • HTS 116 emulates the functions of a typical mobile station. HTS 116 therefore enables PBX terminals 122 to communicate with external telephone networks 106 over a wireless interface.
  • information processing performed by the present invention can be classified into inbound information processing and outbound information processing.
  • Inbound information processing refers to the steps involved in communicating inbound information from an external telephone network terminal to a terminal serviced by PBX 118.
  • Outbound information processing refers to the steps involved in communicating outbound information from a terminal connected to PBX 118 to an external telephone network terminal.
  • HTS 116 receives outbound information from PBX 118 and transmits it to BTS 108 over a radio interface via antenna 114. Similarly, HTS 116 receives inbound information from BTS 108 over the radio interface via antenna 114 and forwards the received inbound information to PBX 118. In this manner, PBX 118 can communicate with external telephone networks 106 over a wireless network without the need for physical PSTN connections between the terminals of PBX 118 and the external telephone network terminals.
  • FIG. 2 depicts a flowchart 130 showing the steps involved in inbound information processing for an embodiment of the invention.
  • inbound information processing is initiated at step 132 when MSC 112 receives inbound information from an external telephone network terminal which is to be forwarded to one or more terminals serviced by PBX 118.
  • MSC 112 In order to route the inbound information to the appropriate BTS, MSC 112 has access to a subscriber information database which contains a list of all mobile stations that are supported by that particular MSC.
  • the wireless private branch exchange emulates a mobile station. Consequently, all terminals 122 of PBX 118 are mapped to the same subscriber entry in the subscriber information database.
  • MSC 112 uses destination information contained in the inbound information to locate the subscriber database entry corresponding to wireless private branch exchange 104. MSC 112 then routes the inbound information to BTS 108 which is responsible for communicating with wireless private branch exchange 104. At step 134, BTS 108 transmits the inbound information to wireless private branch exchange 104.
  • HTS 116 of wireless private branch exchange 104 receives inbound information transmitted by BTS 108.
  • HTS 116 decodes the inbound information. Since the GSM information format is different from the ISDN information format supported by PBX 118, at step 140, HTS 116 converts the inbound information from a GSM format to an ISDN format.
  • the data format used to transmit data to a PSTN is used to transmit data from HTS 116 over an ISDN 120.
  • protocol conversion from GSM to ISDN refer to M. Mouly, The GSM System for Mobile Communications. Chapter 3, pg. 140-142 (1992) (International Standard Book Number 2-9507190-0-7).
  • HTS 116 forwards the inbound information to PBX 118.
  • PBX 118 uses the destination information contained in the inbound information to route the inbound information to the appropriate terminal(s). This completes the inbound information processing process.
  • FIG. 3 depicts a flowchart 150 showing the steps involved in outbound information processing for an embodiment of the invention.
  • outbound information processing is initiated at step 152 when PBX 118 receives a request from one or more of its terminals 122 requesting outbound information to be communicated to an external telephone network terminal.
  • PBX 118 forwards the outbound information to HTS 116.
  • the information received from PBX 118 is in ISDN format which needs to be converted to the GSM format before it can be transmitted via the wireless interface.
  • HTS 116 converts the outbound information from ISDN format to GSM format.
  • the data format used to transmit data to a PSTN is used to transmit data over an ISDN 120 to HTS 116.
  • ISDN to GSM protocol conversion refer to M. Mouly, The GSM System for Mobile Communications. Chapter 3, pg. 140-142 (1992).
  • HTS 116 encodes the outbound information and prepares it for transmission.
  • HTS 116 uses antenna 114 to transmit the encoded outbound information via the radio interface to BTS 108.
  • BTS 108 receives the outbound information transmitted by HTS 116.
  • the outbound information is then routed via BSC 110 to MSC 112.
  • MSC 112 performs the necessary inter-networking functions and routes the outbound information to the appropriate external telephone network terminal. This concludes the outbound information processing process.
  • FIG. 4 is a block diagram depicting the internal structure of HTS 116 in accordance with one embodiment of the present invention.
  • HTS 116 comprises an antenna 114, a diplexer 168, a receiver 170, a transmitter 176, a processor 182 and a protocol converter 184.
  • Antenna 114 is used both for receiving inbound information transmitted by BTS 108 and for transmitting outbound information to BTS 108.
  • a common antenna 184 can be used for both reception and transmission of information since the transmit frequency band of the GSM wireless communication network is disjoint from the receive frequency band.
  • each of the frequency bands occupies approximately 25MHz , with the GSM transmit frequency band approximately in the range of 890- 915MHz and the receive frequency band approximately in the range of 935- 960MHz.
  • Antenna 114 is connected to receiver 170 and transmitter 176 via diplexer 168.
  • Receiver 170 is responsible for receiving the inbound information transmitted by BTS 108 during inbound information processing. This corresponds to step 136 in Figure 2.
  • Receiver 170 comprises a receiver synthesizer 172 and a receiver mixer 174.
  • Receiver synthesizer 172 is programmed to generate the receive frequency for HTS 116 which corresponds to the transmit frequency of BTS 108.
  • synthesizer 172 On receiving the inbound information using antenna 114, synthesizer 172 provides the information frequency to receiver mixer 174, which down-mixes the received signal and provides the inbound information signal to processor 182.
  • Transmitter 176 is responsible for transmitting outbound information to BTS 108 during outbound information processing. This corresponds to step 160 in
  • Transmitter 176 comprises a transmitter synthesizer 178 and a transmitter mixer 180.
  • Transmitter synthesizer 178 is programmed to generate the transmit frequency for HTS 116 which corresponds to the receive frequency of BTS 108.
  • Transmitter synthesizer 178 provides the frequency to transmitter mixer 180, which up-mixes the outbound information signal received from the processor 182 and provides a radio frequency signal to be transmitted to BTS 108 via antenna 114.
  • Processor 182 is coupled to receiver 170, transmitter 176 and protocol converter 184.
  • Processor 182 is responsible for decoding the inbound information signal (corresponding to step 138 in Figure 2) and for encoding the outbound information signal (corresponding to step 158 in Figure 3) to be transmitted to BTS 108 via the antenna.
  • Protocol converter 184 forms the boundary between the GSM domain and the ISDN domain supported by PBX 118. Protocol conversion is required for interconnecting the GSM domain to the ISDN domain. This is accomplished by protocol converter 184 which converts inbound information from GSM format to ISDN format (corresponding to step 140 in Figure 2) and outbound information from ISDN format to GSM format (corresponding to step 156 in Figure 3). For further details on protocol conversion between ISDN and GSM refer to M.
  • protocol converter 184 is not restricted to GSM-ISDN conversions. Conversions between other telecommunication protocols known in the art are also within the scope of the invention.
  • Protocol converter 184 is connected to PBX 118 via ISDN link 120. Protocol converter 184 uses link 120 to forward inbound information to PBX 118 (corresponding to step 142 in Figure 2) and to receive outbound information from PBX 118 (corresponding to step 154 in Figure 3).
  • PBX 118 is connected to a plurality of terminals 122 including but not restricted to telephones, fax machines, and computers. As mentioned earlier PBX 118 supports functions performed by typical prior art PBX systems, such as call routing, call redirection, call forwarding, and call waiting.
  • FIG. 5 depicts telephone network 190 incorporating an alternate embodiment of the present invention.
  • PBX 118 is not only connected to HTS 116 but is also connected to an external PSTN network 106 via physical link 192.
  • This setup is typically found in establishments which have an already existing PSTN base but want to further increase the capacity of the PBX using the wireless communication capability.
  • PBX 118 has a choice of using wired PSTN interface 192 or the wireless radio interface for communicating with external telephone networks. Since the cost of communication over a wired interface is cheaper than using a wireless interface, it is desirable that PBX 118 make use of the wireless interface only if the wired PSTN interface 192 is operating at full capacity and is unable to handle any more PBX call requests.
  • PBX 118 is configured to first attempt to make a connection using the wired PSTN interface. If the PSTN interface is already operating at full capacity and the call request cannot be successfully completed, then PBX 118 routes the connection request via the wireless interface. In this manner PBX 118 not only maximizes the PSTN network usage but also allows for increased capacity using the wireless interface. This optimal use of the existing wired PSTN services and wireless services translates to substantial cost savings. It should be apparent to those skilled in the art that various implementations of this embodiment are possible without departing from the true scope of the invention.
  • FIG. 6 depicts a telephone network 194 incorporating another alternate embodiment of the present invention.
  • PBX 118 is connected to a plurality of HTSs 114-1 to 114-n.
  • the number of PBX terminal connections that can be concurrently maintained over the wireless interface depends on the number of time slots that make up a GSM frame.
  • a typical GSM frame comprises eight time slots. Therefore, a wireless private branch exchange comprising a single HTS can support up to eight connections simultaneously over the wireless interface.
  • PBX 118 is connected to a plurality of HTSs with their own respective receive and transmit frequencies. Since each HTS can support up to eight connections, the addition of each additional HTS increases the capacity of the PBX by eight connections. Thus, the PBX capacity can be easily increased as and when required by simply increasing the number of HTSs connected to PBX 118.
  • Advantages of the invention include the ability to increase the communication capacity of a PBX without the need to install additional PSTN lines. This translates to substantial savings in costs which would otherwise have to be incurred in installing additional PSTN lines. It provides commercial establishments with a cost efficient way to increase their communication bandwidth.
  • the invention further reduces costs by maximizing the usage of the cheaper wired communication interface before routing the connection requests over the wireless interface.
  • the invention thus allows for optimal use of the wired PSTN and wireless radio interfaces.
  • the capacity of a wireless PBX can be increased quite easily by connecting additional HTSs to the PBX. This offers the PBX administrator great flexibility in regulating the total capacity of the PBX network.

Landscapes

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

Abstract

L'invention concerne un dispositif et un procédé qui permettent d'augmenter la capacité de communication des PBX (104) de manière rentable, via une interface sans fil. Le PBX sans fil (104) considéré comprend un combiné émetteur-récepteur (116) relié à un PBX (118) qui est lui-même relié à plusieurs terminaux (122). Durant le traitement des données entrantes, le réseau de communication sans fil (102) transmet lesdites données au PBX sans fil (104). Les données ainsi transmises par le réseau de communication sans fil (102) sont reçues par le combiné émetteur-récepteur (116), qui décode ces données, effectue la conversion de protocole du format GSM au format RNIS, puis fait suivre au PBX (118). Celui-ci (118) achemine ensuite l'information entrante vers le terminal approprié (122). Durant le traitement des données sortantes, le combiné émetteur-récepteur (116) reçoit lesdites données depuis le PBX (118) et effectue la conversion de protocole du format RNIS au format GSM, code l'information sortante et la fait suivre via une interface sans fil, à destination du réseau de communication sans fil (102). Celui-ci (102) achemine ladite information vers le terminal de réseau téléphonique externe. Dans certains modes de réalisation, le dispositif et le procédé considérés sont destinés à être utilisés avec le protocole GSM et sont compatibles avec d'autres techniques numériques.
PCT/US1999/000845 1998-01-15 1999-01-14 Autocommutateur prive (pbx) sans fil WO1999037036A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002317731A CA2317731A1 (fr) 1998-01-15 1999-01-14 Autocommutateur prive (pbx) sans fil
AU21167/99A AU751347B2 (en) 1998-01-15 1999-01-14 Wireless private branch exchange
AT99901480T ATE217128T1 (de) 1998-01-15 1999-01-14 Drahtloses pbx-system
DE69901387T DE69901387T2 (de) 1998-01-15 1999-01-14 Drahtloses pbx-system
EP99901480A EP1060569B1 (fr) 1998-01-15 1999-01-14 Autocommutateur prive (pbx) sans fil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7107598P 1998-01-15 1998-01-15
US60/071,075 1998-01-15

Publications (1)

Publication Number Publication Date
WO1999037036A1 true WO1999037036A1 (fr) 1999-07-22

Family

ID=22099091

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/000845 WO1999037036A1 (fr) 1998-01-15 1999-01-14 Autocommutateur prive (pbx) sans fil

Country Status (2)

Country Link
CA (1) CA2317731A1 (fr)
WO (1) WO1999037036A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12117541B2 (en) 2017-11-02 2024-10-15 Zte Corporation Positioning method and device, and server and system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5544226A (en) * 1991-08-30 1996-08-06 Alcatel N.V. Private branch exchange having a central control unit and a mobile control unit subordinate thereto
US5544227A (en) * 1993-08-31 1996-08-06 Bellsouth Corporation Radiotelephone communications system with direct access to interoffice telephone trunk circuits and interface therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5544226A (en) * 1991-08-30 1996-08-06 Alcatel N.V. Private branch exchange having a central control unit and a mobile control unit subordinate thereto
US5544227A (en) * 1993-08-31 1996-08-06 Bellsouth Corporation Radiotelephone communications system with direct access to interoffice telephone trunk circuits and interface therefor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1060569A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12117541B2 (en) 2017-11-02 2024-10-15 Zte Corporation Positioning method and device, and server and system

Also Published As

Publication number Publication date
CA2317731A1 (fr) 1999-07-22

Similar Documents

Publication Publication Date Title
US6081716A (en) Wireless private branch exchange
CN1087568C (zh) 无线互联网络话音与数据通信的结构
US6337979B1 (en) PDC (personal digital cellular) communication controlling apparatus and system thereof
KR100394284B1 (ko) 인터스위치핸드오버들을제공하는방법및장치
US5987327A (en) Method for establishing communications in wireless communication systems having multiple switching centers
US6075985A (en) Wireless access system with DID and AIOD functions
JPH09501034A (ja) 通信ネットワーク内の無線送信機／受信機との通信のための必要バンド幅を減らすための分散ベース局
EP0795256B1 (fr) Systeme de radiocommunication
JP3350175B2 (ja) 小型無線通信システム
RU2147771C1 (ru) Дистанционное вокодирование по линии связи на большую дальность действия
AU751347B2 (en) Wireless private branch exchange
US20040235500A1 (en) System for providing unified cellular and wire-line service using a home cell
AU716483B2 (en) Cellular adjunct to a public wired network
KR20050021438A (ko) 지역 통신망을 이용한 휴대 전화 시스템
WO1999037036A1 (fr) Autocommutateur prive (pbx) sans fil
AU745622B2 (en) Mobile communication system including base stations each having definite number of traffic channels
JP3512318B2 (ja) ワイヤレスローカルループ方式を用いた電話網システム及びその伝送路制御方法
WO2005055625A1 (fr) Systeme de communication mobile integre et dispositif de la station de base integre
KR100353713B1 (ko) 음성 및 데이터를 통합하여 처리하기 위한 통신 시스템
WO1998027757A2 (fr) Methode pour transmettre un numero d'annuaire d'un poste pbx par une interface radio
JPH08307941A (ja) 移動通信システムおよびこのシステムで使用される統合制御装置並びに共用基地局装置
JPS63194431A (ja) 移動通信交換方式
WO1998028934A1 (fr) Systeme radio pour reseau fixe
MXPA99005576A (en) Use of isdn to provide wireless office environment connection to the public land mobile network
KR20060076983A (ko) 사설교환기의 착신전환 시스템 및 방법

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 99803998.5

Country of ref document: CN

AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG UZ VN YU ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
ENP Entry into the national phase

Ref document number: 2317731

Country of ref document: CA

Ref document number: 2317731

Country of ref document: CA

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: KR

WWE Wipo information: entry into national phase

Ref document number: 21167/99

Country of ref document: AU

Ref document number: 1999901480

Country of ref document: EP

Ref document number: IN/PCT/2000/184/KOL

Country of ref document: IN

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWP Wipo information: published in national office

Ref document number: 1999901480

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1999901480

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 21167/99

Country of ref document: AU