EP1597926A2 - Systeme et unite de communication sans fil et commande a distance destinee a ceux-ci - Google Patents

Systeme et unite de communication sans fil et commande a distance destinee a ceux-ci

Info

Publication number
EP1597926A2
EP1597926A2 EP04713904A EP04713904A EP1597926A2 EP 1597926 A2 EP1597926 A2 EP 1597926A2 EP 04713904 A EP04713904 A EP 04713904A EP 04713904 A EP04713904 A EP 04713904A EP 1597926 A2 EP1597926 A2 EP 1597926A2
Authority
EP
European Patent Office
Prior art keywords
wireless communication
communication unit
message
sds
tnpl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04713904A
Other languages
German (de)
English (en)
Inventor
Thomas C. Kildegaard
Svend Frandsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
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 EP1597926A2 publication Critical patent/EP1597926A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/12—Messaging; Mailboxes; Announcements
    • H04W4/14—Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H04W8/245—Transfer of terminal data from a network towards a terminal

Definitions

  • This invention relates to remote control and/or monitoring of wireless communication devices.
  • the invention is applicable to, but not limited to, using short data messages for such purposes.
  • Wireless communication systems typically provide for radio telecommunication links to be arranged berween a plurality of base transceivex stations (BTSs) and a plurality of subscriber units, often termed mobile stations (MSs) or mooile terrni ⁇ slp (MTs) or Mobile Equipment (ME) .
  • BTSs base transceivex stations
  • MSs mobile stations
  • MTs mooile terrni ⁇ slp
  • ME Mobile Equipment
  • t.e terms mobile station (MS) , mobile terminal (MT) and mobile equipment (ME) are used interchangeably.
  • a number of multiple access techniques exist for example frequency division multiple access (FDMA) , time division multiple access (TDMA) and code division multiple access (CDMA) , whereby a finite communication resource is divided into any number of physical parameters.
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • CDMA code division multiple access
  • different duplex ⁇ two-way communication paths are arranged.
  • Such paths can be arranged in a frequency division duplex (FDD) configuration, whereby a frequency is dedicated for uplink communication, i.e. from a MS to its serving BTS and a second frequency is dedicated for downlink communication, i.e. from a serving BTS to one or more MS.
  • FDD frequency division duplex
  • the paths can be arranged in a time division duplex (TDD) configuration, whereby a first time period is dedicated for up-link communication and a second
  • TETRA TErrestrial Trunked RAdio
  • ETSI European Telecommunications Standards Institute
  • a primary focus for TETRA equipment is the emergency services,, as TETRA provides a dispatch and control operation.
  • MS mobile station
  • MS is able to transmit and receive control, voice and data information.
  • SwMI switching and management infrastructure
  • This includes base transceiver stations (BTSs) connected to a conventional public-switched telephone network (PSTN), through base station controllers (BSCs) and mobile switching centres (MSCs) .
  • BTSs public-switched telephone network
  • BSCs base station controllers
  • MSCs mobile switching centres
  • a network Operator or indeed third party software vendor, is able to download (or upgrade) related software and/or operational parameters to a number (or fleet) of wireless subscriber units without the need for the wireless subscriber units to be recalled to the factory for re-programming.
  • Configuration and reprogramming can also be performed by physically connecting a programming device to the radio.
  • configuration and control can be achieved by use of the AT and TNP1 interface.
  • GSM phones also have an AT command interface through which control over the radio can be achieved.
  • a programming tool such as a laptop computer (hereinafter referred to as a test equipment (TE) ) , and an ME are then coupled together with a hard-wired connection therebetween, to facilitate re- programming, control over, and configuration of, the ME using the AT interface.
  • TE test equipment
  • FIG. 1 shows a simplified block diagram 100 illustrating a first known mechanism for using a hard-wired connection 122 to externally monitor or program a ME 140. This mechanism for externally programming or monitoring an operation of the ME is applicable to a TETRA MT or a GSM phone.
  • a TE 110 is coupled to the MT 140 via the first hard-wired connection 122, which facilitates programming of the MT 140 using AT commands.
  • the TE 110 includes a TE control application block that is used for monitoring and controlling the MT 140.
  • the TE control AT commands are routed to the MT 140 via the RS-232 interface.
  • the MT 140 receives the AT commands via its RS-232 interface 152 and routes the SDS-AT message via its 'AT' function 148, which separates the AT command (used for configuration and external monitoring) from the SDS portion of the message.
  • the SDS portion of the message is then routed via SDS relay function 146 to an SDS application 142.
  • a second hardwired connection mechanism is known, as shown in the simplified block diagram 200 of FIG. 2.
  • the second hardwired connection mechanism uses a TETRA network protocol (TNPl) communication link between the TE 220 and an MT 260, to facilitate external monitoring or control of the MT 260.
  • TNPl TETRA network protocol
  • the TNPl mechanism uses the known Internet Protocol (I?) to effect the external control or monitoring of the MT 260.
  • a TE 220 includes a TNPl application 222, which provides the software TNPl code via a user datagram protocol (UDP) function 224, an IP formatting function 226 and an IP relay 228 to a point-to-point protocol (PPP) function 230.
  • UDP user datagram protocol
  • PPP point-to-point protocol
  • the TNPl code is then loaded into the MT in an IP formatted message via hard-wired link 232.
  • the MT 260 receives the IP formatted TNPl code in its PPP function 272.
  • the TNPl code is then routed to the TNPl Relay application 264.
  • the IP address used is a special IP address used by all MTs, as defined in the TETRA standard. IP datagrams addressed to other IP addresses are sent over the air to the SwMI . It is known that, internally within the MT, one or more IP applications may exist. Wireless Application Protocol ( " WAP) is such an application. Messages from the WAP application are routed over the air. Messages to the MT internal application are, dependent upon the IP port number used in the message, routed not to the external TE application but to the internal WAP application.
  • the configuration shown in FIG. 2 allows a hard-wired TE 220, such as a laptop computer, to be physically connected 232 to the MT 260, in order to configure and monitor the MT 260.
  • a hard-wired TE 220 such as a laptop computer
  • the TNP1-IP mechanism in the same manner as the SDS-AT mechanism, requires a physical hard-wired connection tc the MT 260.
  • TETRA OTA configuration and control is not shown in any of the diagrams. It is noteworthy that, TETRA OTA configuration and control messages use individually designed protocols, which are different from SDS and IP.
  • TNPl mechanism enables programming or remote control of a single hard-wired MT. This is the standard TETRA IP connectivity mechanism via the TNPl PEI interface.
  • the MT 260 is assigned an IP address from the SwMI 280.
  • the unique address enables IP datagrams 282 to be sent from the SwMI 280 to the MT' s WAP application 262 or to the external application 222 on TE 220.
  • the MT' s internal WAP application 262, or the TE' s external TNPl application 222 to send IP datagrams to the SwMI 280.
  • These messages are sent between the SwMI 280 and MT 260 via layez-2 to layer ⁇ l conversion functions 276, 286 and subnet dependent convergence protocol (SNDCP) functions 274, 284 as shown.
  • SNDCP subnet dependent convergence protocol
  • Control messages between the TE 220 and the MT 260 are routed to the MT 260 using the special IP address (standardized in the TETRA standard)
  • the TE 110, 220 may be configured to include a 'virtual' remote control head of the radio in the lap-top to allow a number of performance attributes of the MT 140, 260 to be externally monitored (using a local hard-wired connection) . In this manner, the TE 110, 220 is able to gather radio information, such as receiver field strength, battery charge, bit error rate (BER) , etc.
  • radio information such as receiver field strength, battery charge, bit error rate (BER) , etc.
  • remote control application software has been developed to enable remote control of the radio in various situations. Examples of such remote control include:
  • DGNA Dynamic Group Number Assignment
  • a Supplementary Service of Ambience Listening (SS-AL) , which, is used to set up a call from a console, so that the console can listen in to the MT' ⁇ microphone, without the mobile user knowing.
  • the technology developed to perform remote control of the TETRA MT (such as DGNA and SS-AL) is designed such that each application requires its own protocol. This makes the use of remote application control software unattractive, and the implementation very complex.
  • a wireless communication unit as claimed in Claim 12.
  • the preferred embodiment of the present invention proposes a mechanism that uses standardised connection interfaces on a wireless communication unit to be used in an over-the-air monitoring and configuration function.
  • an operation or performance attribute of the wireless subscriber unit can be monitored or controlled remotely, for example by the system infrastructure.
  • FIG. 1 shows a block diagram of a known mechanism for configuring a mobile terminal (MT) in a cellular or TETRA communication system using short data service Au fixed connection;
  • FIG. 2 shows a block diagram of a known mechanism for configuring and monitoring a mobile terminal (MT) in a TETR ⁇ communication system using a TETRA network protocol (TNPl) fixed connection, and an IP-based over-the-air communication mechanism.
  • MT mobile terminal
  • TNPl TETRA network protocol
  • FIG. 3 shows a block diagram of a mobile terminal (MT) such as a cellular or TETRA MT capable of being adapted in accordance with the preferred embodiments of the present invention
  • FIG. 4 shows a block diagram of a mechanism for configuring and monitoring a mobile terminal (MT) ih a cellular or TETRA communication system for use in an OTA- based snort data service-AT connection, in accordance with a first embodiment of the present invention
  • FIG. 5 shows a block diagram of a mechanism for configuring and monitoring a mobile terminal (MT) in a TETRA communication system for use in an OTA-based short data service employing a TETRA network protocol connection, in accordance with a second embodiment of the present invention
  • FIG. 6 shows a block diagram of a mechanism for configuring a mobile terminal (MT) in a TETRA communication system using an OTA IP-based TETRA network protocol connection, in accordance with a third embodiment of the present invention.
  • GSM System Global System for Mobile Communication
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data fcx GSM Evolution
  • UMTS Universal Mobile Telecommunications System
  • TETRA Peripheral Equipment Interface
  • TNPl network protocol
  • the PEI interface enables an external application or device (hereinafter referred to as a test equipment (TE) ) to be hard-wire connected to the interface to control the MT.
  • TE test equipment
  • the PEI is configured in a manner that facilitates OTA remote control and remote monitoring of the MT. In order to control remotely an MT, when the MT is busy for example participating in a voice call, the MT needs to be capable of transmitting and receiving IP datagrams and voice at the same time.
  • short data service (SDS) messages is used to encompass any short data message, for example a short message service (SMS) message in a cellular system or a short data service (SDS) message in a private (or public) radio system.
  • SMS short message service
  • SDS short data service
  • IP can be used to transport the AT or TNPl commands to the MT .
  • IP can also be used when control and monitoring is desired when the TM is in a voice call.
  • SDS-AT or SDS TNPl or IP-TNPl commands are sent to an individually identified and addressed MT over the air, encapsulated in either a SDS message or a UDP/IP message.
  • a MT can be monitore ⁇ and remote controlled from the infrastructure or indeed from another MT.
  • a first embodiment of the present invention utilises an SDS-AT-based message, whilst a second embodiment of the present invention utilises an SDS-TNP1 protocol.
  • FIG. 3 a block diagram of a wireless communication device (MT) 300, adapted to support the inventive concepts of the preferred embodiments of the present invention, is shown.
  • the MT 300 contains an antenna 302 preferably coupled to a duplex filter or circulator or antenna switch 304 that provides isolation between receive and transmit chains within wireless communication device 300.
  • the receiver chain includes receiver front-end circuitry 306 (effectively providing reception, filtering and intermediate or base-band frequency conversion) , which may provide a scanning function (the ability to sample information on more than one channel) .
  • the front-end circuit 306 is serially coupled to a signal processing function (processor, generally realised by a digital signal processor (DSP) ) 308 via a baseband (back-end) processing circuit 307-
  • DSP digital signal processor
  • a controller 314 is operably coupled to the front-end circuitry 306 so that the receiver can calculate receive bit-error-rate (BER) or frame-error-rate (FER) or similar link-quality measurement data from recovered information, which may also incorporate a received signal strength indication (RSS1) 312 function.
  • the RSSI function 312 is operably coupled to the front-end circuit 306.
  • the memory device 316 stores a wide array of device-specific data, for example decoding/encoding functions, frequency and timing information for the MT 300, etc.
  • a timer 318 is operably coupled to the controller 314 to control the timing of operations, namely the transmission or reception of time-dependent signals, within the MT 300.
  • received signals that are processed by the signal processing function are typically input to an output device, such as a speaker or visual display unit (VDTJ)
  • the transmit chain essentially includes an input device 320, such as a microphone, coupled in series through a processor 308, transmitter/modulation circuitry 322 and a power amplifier 324.
  • the processor 308, transmitter/modulation circuitry 322 and the power amplifier 324 are operationally responsive to the controller, with an output from the power amplifier coupled to the duplex filter or circulator or antenna switch 204, as known in the art.
  • the signal processing function 308, in conjunction with the memory device 316 and controller 314 have been adapted to map received OTA SDS or SMS messages to standardised AT or network protocol (such as TNPl) messages (only previously used in hard-wired connections).
  • the memory device may comprise mapping data with the controller having been adapted to route messages in accordance with the preferred embodiments described below.
  • the signal processor function 308 in the transmit chain may be implemented as distinct from the processor in the receive chain.
  • a single processor 308 may be used to implement the processing of both transmit and receive signals, as shown in FIG. 3.
  • the various components within the MT 300 may be realised in discrete or integrated component form.
  • the MT 300 may be any wireless communication device, such as a portable or mobile PMR radio, a mobile phone, a personal digital assistant, a wireless laptop computer, etc.
  • any re-programming or adaptation of the processor 308, according to the preferred embodiment of the present invention may be implemented in any suitable manner.
  • a new processor 308 or memory device 316 may be added to a conventional MT 300, or alternatively existing parts of a conventional MT may be adapted, for example by reprogramming one or more processors therein.
  • the required adaptation may be implemented in the form of prGcessor-imple entable instructions stored on a storage medium, such as a floppy disk, hard disk, programmable read-only memory (PROM) , random access memory ⁇ RAM) or any combination of these or other storage media.
  • a storage medium such as a floppy disk, hard disk, programmable read-only memory (PROM) , random access memory ⁇ RAM
  • FIG. 4 a block diagram of a mechanism 400 for remotely controlling and monitoring an MT in a cellular or TETRA communication system is shown.
  • the communication system uses a short data service message containing an AT command, in accordance with a first preferred embodiment of the present invention.
  • a TE 410 is shown as optionally coupled to the MT 440 via a hard-wired connection 422, as known in the art.
  • An OTA mechanism is used.
  • An network infrastructure (SwMI in a TETRA System) 470 includes an SDS application block that facilitates SDS control and monitoring of the MT.
  • the SDS messages carrying the AT commands are routed to a new SDS-to-AT mapping function 460 in the MT 440 via a circuit mode control entity (CMCE) 450, 474 and a layer-2 to layer-1 conversion function 454, 476 in both the network infrastructure 470 and the MT 440.
  • An SDS relay function 446 routes the SDS messages to the correct application.
  • the SDS-to-AT function 460 strips off one or more 'attention (AT)' commands from the SDS message.
  • SDS messages are therefore configured to carry AT commands.
  • an MT 440 has been adapted (for example, by adapting signal processor 308 of FIG. 3) by incorporating an SDS-to-AT mapping function 460, to strip AT commands from received OTA SDS messages.
  • the SDS-to- AT mapping function 460 strips off the SDS message and forwards the extracted AT command to the AT function 448.
  • the expression 'external' is primarily used to indicate an external hard-wired connection, whereas the expression remotely' is used to indicate a distal OTA connection to the MT.
  • this mechanism for remote controlling and/ or remote monitoring an MT via a specific OTA message from the network infrastructure offers a network operator significantly more flexibility in tracking and/or controlling the operational performance of MTs in the communication system. It is noteworthy that TETRA SDS functions used in this manner have the capability to address a TE as well as a specific application in the MT.
  • the second mechanism using SDS messages for network protocol (TNPl) codes is illustrated in FIG. 5, whilst a third mechanism using an IP datagram-based TNPl network protocol message to remote controlling and/or remote monitoring of the MT 560 is illustrated in FIG. 6.
  • FIG. 5 a block diagram 500 is shown illustrating a second mechanism for configuring an MT 560 in a TETRA communication system using a short data service employing a TETRA network protocol connection, in accordance with an alternative preferred embodiment of the present invention.
  • the second mechanism again illustrates an optional IP- based TETRA network protocol (TNPl) communication link between the TE 520 and an MT 560, to externally monitor or configure an individual MT 560, as known in the art.
  • the TE 520 includes a TNPl application 522 that provides the software TNPl code via a UDP 524, an IP formatting function 526 and an IP relay 528 to a PPP function 530, as known in the art.
  • the IP address used by the TE to address the MT, when using the TNPl protocol, is fixed and standardised in the TETRA standard.
  • the MT has been adapted to receive OTA TNPl software codes.
  • the signal processor 308 of FIG. 3 has been adapted to receive and process OTA TNPl software codes.
  • the MT 560 has been adapted tc include a SDS-to-TNPl mapping function 550, which unpacks TNPl commands contained within SDS OTA messages that are received from •the network infrastructure (SwMI) 580. These SDS messages are routed via an SDS relay function 552. The message to network protocol (SDS-to-TNPl) mapping function 550 then sends the unpacked network protocol (TNPl) commands to the MT' s internal TNPl relay function 564.
  • SDS-to-TNPl mapping function 550 The message to network protocol (SDS-to-TNPl) mapping function 550 then sends the unpacked network protocol (TNPl) commands to the MT' s internal TNPl relay function 564.
  • the MT 560 is now able to receive TNPl network protocol commands in an OTA manner, in addition to the known mechanism of using hard-wired network protocol (TNPl) commands received from the TE 520.
  • TNPl hard-wired network protocol
  • the new functions i.e. either the SDS-to- AT application 460 and/or the SDS-to-TNPl application 550, may be arranged to reside in the TE 520, for example in a TE TNPl application 522.
  • the external application must be connected to the TM 440, 560 for the proposed programming or remote control/monitoring functions to work.
  • the MT 560 requests and obtains a unique IP address from the network infrastructure (SwMI) 580, i.e. an address that distinguishes that particular MT from other MTs in the communication system.
  • the mechanism used to obtain a unique IP address is instigated, for example, when an external application such as TNPl function 522 from TE 520, registers through a point-to-point protocol (PPP) link 532.
  • PPP point-to-point protocol
  • the process can be instigated when the MT's internal IP application (which could for example be a WAP-based application) is initiated.
  • the MT 560 requests an IP address from the network infrastructure (SwMI) 580. This IP address can then be used to address that particular MT 560 from the network infrastructure (SwMI) 580.
  • the above unique address process follows the TETRA standard.
  • FIG. 6 an alternative simplified mechanism to that described in FIG. 5 is illustrated, in accordance with a third embodiment of the present invention.
  • the IP relay function 670 (preferably implemented within a signal processor, for example signal processor 308 of FIG. 3) has been adapted, so that IP datagrams and IP addresses can be used.
  • the IP relay function 670 is able to accept IP datagrams that are sent from the TE (per the TETRA standard) as well as IP datagrams addressed from the network infrastructure (SwMI) .
  • the IP relay function 670 has therefore been adapted to identify the specified route of IP datagram messages passing there through. In this manner, the network infrastructure (SwMI; is able to send network protocol (TNPl) commands tc the MT.
  • SwMI network protocol
  • TNPl network protocol
  • the network infrastructure would need to distinguish between respective MTs on the basis of their International Terminal Subscriber Identity (ITSI) or International Mobile Subscriber Identity (IMSI) rather on their IP address.
  • the IP relay may reserve a port number for network protocol (TNPl) connections.
  • TNPl network protocol
  • this configuration is limited in TETRA radios in that it cannot be used whilst the MT is in a call, as the TETRA standard has dictated that it is not possible to communicate with IP datagrams whilst in a call.
  • this embodiment is particularly useful for implementing intermittent measurements, such as remotely monitoring RSSI levels or MT battery levels .
  • TNPl commands are used.
  • some standard TNPl commands that can be used include:
  • 'TNP1-STATE request' - to be used by a TE user application 522 to request basic information of the operational state of the MT 560 ;
  • 'TNP1-STATE indication' - to indicate a state information request to the MT user application that co-ordinates providing information of the operational state of the MT 560;
  • the over-the-air TNPl commands can be sent using a standard "TEMM ATTACH DETACH GROUP IDENTITY REQ" message.
  • This packet data unit (PDU) message is then used to convey the parameters of TNMM- ATTACH DETACH GROUP IDENTITY request from the network infrastructure 580, 680 to the MT 560, 660, as defined in Table 2 below.
  • TNPl network protocol
  • the exemplary new SDS-to-AT function in the MT 440 of FIG. 4, or the exemplary new SDS-to TNPl function in the MT 560 of FIG. 5 or the modified IP relay function 670 in the MT 660 of FIG. 6, is/are preferably implemented within a signal processor function, for example signal processor 308 of FIG. 3.
  • a signal processor function for example signal processor 308 of FIG. 3.
  • new hardware or firmware may be incorporated into the MT to provide such functionality.
  • the present invention has been described with reference to an application for remote control and monitoring of a TETRA subscriber device, it is envisaged that the inventive concepts are equally applicable for Cellular platforms, such as the Global System for Mobile communications (GSM) or the GSM-based General Packet radio system (GPRS) or the universal mobile telecommunication system (UMTS) or CDMA-2000.
  • GSM Global System for Mobile communications
  • GPRS General Packet radio system
  • UMTS universal mobile telecommunication system
  • CDMA-2000 Code Division Multiple Access 2000
  • the inventive concepts hereinbefore described particularly with regard to use of AT commands may be utilised for remote control and/or monitoring of subscriber devices using, say SMS messages, as supported by these standards.
  • the MT In order to control a MT when the MT is busy- in a voice call, the MT is capable of transmitting/ receiving IP data and voice at the same time by sending network protocol commands in a data message.

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  • Engineering & Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transceivers (AREA)
  • Selective Calling Equipment (AREA)

Abstract

L'invention concerne un système de communication sans fil (400, 500, 600) comportant une unité de communication sans fil (440, 560, 660) couplée activement à une infrastructure de communication (470, 580, 680) par l'intermédiaire d'une interface aérienne (456, 556, 656). L'unité sans fil comporte un récepteur et un processeur destiné à traiter un message en direct. L'unité de communication sans fil comporte également une fonction de mappage (460, 550) destinée au mappage du message traité sur un message d'interface standardisé, de manière à permettre que le processeur reconfigure une fonction de l'unité de communication sans fil afin de faciliter la commande à distance et/ou la surveillance à distance d'attributs ou de fonctions de ladite unité.
EP04713904A 2003-02-27 2004-02-24 Systeme et unite de communication sans fil et commande a distance destinee a ceux-ci Withdrawn EP1597926A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0304499A GB2398966B (en) 2003-02-27 2003-02-27 Wireless communication system,wireless communication unit and remote control thereof
GB0304499 2003-02-27
PCT/EP2004/050198 WO2004077842A2 (fr) 2003-02-27 2004-02-24 Systeme et unite de communication sans fil et commande a distance destinee a ceux-ci

Publications (1)

Publication Number Publication Date
EP1597926A2 true EP1597926A2 (fr) 2005-11-23

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EP04713904A Withdrawn EP1597926A2 (fr) 2003-02-27 2004-02-24 Systeme et unite de communication sans fil et commande a distance destinee a ceux-ci

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Country Link
EP (1) EP1597926A2 (fr)
CN (1) CN1757248A (fr)
GB (1) GB2398966B (fr)
WO (1) WO2004077842A2 (fr)

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CN1757248A (zh) 2006-04-05
WO2004077842A3 (fr) 2005-03-10
GB2398966B (en) 2005-06-01
WO2004077842A2 (fr) 2004-09-10
GB2398966A (en) 2004-09-01
GB0304499D0 (en) 2003-04-02

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