WO2002069570A1 - Dispositif d'interface de communications servant a recevoir des signaux numeriques - Google Patents

Dispositif d'interface de communications servant a recevoir des signaux numeriques Download PDF

Info

Publication number
WO2002069570A1
WO2002069570A1 PCT/EP2002/001695 EP0201695W WO02069570A1 WO 2002069570 A1 WO2002069570 A1 WO 2002069570A1 EP 0201695 W EP0201695 W EP 0201695W WO 02069570 A1 WO02069570 A1 WO 02069570A1
Authority
WO
WIPO (PCT)
Prior art keywords
state
characters
receiver
character
circuitry
Prior art date
Application number
PCT/EP2002/001695
Other languages
English (en)
Inventor
Ramon Van Der Winkel
Tobias Lindqvist
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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
Priority claimed from EP01610016A external-priority patent/EP1235388B1/fr
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to JP2002568575A priority Critical patent/JP4049314B2/ja
Priority to US10/468,260 priority patent/US7580677B2/en
Publication of WO2002069570A1 publication Critical patent/WO2002069570A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1143—Bidirectional transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/12—Arrangements for remote connection or disconnection of substations or of equipment thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
    • H04M1/72409—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality by interfacing with external accessories
    • H04M1/72412—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality by interfacing with external accessories using two-way short-range wireless interfaces
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H04M1/737—Characterised by transmission of electromagnetic waves other than radio waves, e.g. infrared waves
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/02—Details of telephonic subscriber devices including a Bluetooth interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • a communications interface device for receiving digital signals
  • the invention relates to a method of establishing a communications link for exchanging digital signals in the form of characters between a transmitter and a receiver, wherein the transmitter for initialization of a communi- cations link transmits a series of start characters.
  • the invention further relates to a communications interface device.
  • Short-range communications systems are often used for communication between two (or more) devices located within a short distance from each other.
  • Examples of such systems are infrared interfaces, short-range radio interfaces, such as a Bluetooth interface, or wired connec- tions, and examples of the use of such systems include the communication between a mobile telephone and a portable computer, the communication between a personal computer and a printer, or the communication between a mobile telephone and an auxiliary equipment, such as a digital camera or an external memory device.
  • a switched-on interface which is not in the process of exchanging information can typically be in a primary mode or in a secondary mode.
  • the interface actively searches for other interfaces of the same type, normally because it has information to transmit.
  • An interface in the primary mode will typically search for other interfaces with intervals and transmit in each interval a series of start characters.
  • the start characters do not contain any information that needs to be propa- gated or stored in the receiving device, but are merely used to help the receiver initiate itself for receiving actual data.
  • the interface only listens for an interface in primary mode to contact it, and, as mentioned above, an interface will typically be in the secondary mode most of the time. However, even in the secondary mode the interface has a considerable power consumption.
  • the power consumption is an important issue, because it affects the stand-by time or operating time of the device between re-chargings of the battery, and thus it is a drawback that the receiver interface has to be switched on all the time.
  • the receiver interface can be switched on and off manually by the user of the devices so that the receiver only consumes power when it is needed for reception of information, but this solution will normally be inconvenient and time consuming for the user, who may have to switch the receiver interface on and off frequently, and further, the user does not always have sufficient knowledge about when information is going to be exchanged.
  • WO98/41001 discloses a system in which an interface between a mobile telephone and a PC (personal computer) is accomplished via an infrared link.
  • pressing a certain sequence of keys will start the infrared transceiver of the telephone to monitor or poll for incoming infrared signals with a view to establishing an infrared link between the tele- phone and the PC. If during a 20-second period signals seeking to create an infrared link, are received, such a link is established. If, however, no link is established after the 20-second period, the telephone will discontinue monitoring the incoming infrared signals.
  • the object is achieved in that the method comprises the steps of controlling the re-ordinatever to alternate periodically between a first state in which characters can be detected, and a second state in which detection of characters is not possible, with a period shorter than the duration of the series of start characters, the receiver having a power consumption which is higher in the first state than in the second state, and the alternation being controlled such that in each period the receiver assumes the first state for a time which is longer than the duration of a start character; and establishing a communications link if a character is detected.
  • the power consumption of the receiver can be reduced considerably, while it is still ensured that any start character is detected.
  • the method further comprises the step of keeping the receiving circuitry in the first state for a longer time when a communications link is established, it is ensured that after a detected start character the receiver remains in the first state so that the following data characters can also be detected.
  • the digital signals can be transmitted via a wired con- nection, via a radio channel, via an infrared channel, or as other optical signals.
  • the digital signals When the digital signals are transmitted via an infrared channel, they may be transmitted according to the IrDA protocol, and they may be transmitted with a data rate of 9600 bit/s.
  • the start character may be an XBOF character.
  • the method may be used in a mobile telephone.
  • the invention also relates to a communica- tions interface device having receiving circuitry for receiving digital signals in the form of characters from an external transmitter according to a protocol defining that a communications link is to be initialized by transmitting a series of at least a prescribed number of start characters, each start character having a specified duration; said receiving circuitry being able to assume a first state, in which characters can be detected, and a second state, in which detection of characters is not possible; and said receiving circuitry having a power consumption which is higher in the first state than in the second state.
  • the device comprises control means adapted to alternate the receiving circuitry periodically between the first state and the second state with a period shorter than the duration of the series of start characters, such that in each period the receiving circuitry assumes the first state for a time which is longer than the duration of a start character; and the control means is further adapted to establish a communications link if a character is detected, the power consumption can be reduced considerably without causing unnecessary inconvenience and time consumption for the user.
  • the control means is further adapted to keep the receiving circuitry in the first state for a longer time when a communications link is established, it is ensured that after a detected start character the receiver remains in the first state so that the following data characters can also be detected.
  • the receiving circuitry may be adapted to receive the digital signals as electrical signals on a wired connection, or the receiving circuitry may comprise a receiver for radio frequency signals or a receiver for infrared signals .
  • the receiving circuitry may be arranged to communicate according to the IrDA protocol, and it may be arranged to communicate with a data rate of 9600 bit/s.
  • the start character may be an XBOF character.
  • the same interface device may be used for reception as well as transmission of digital signals.
  • figure 1 shows a mobile telephone connected to a personal computer with a connection wherein the invention can be utilized
  • figure 2 shows the configuration of an infrared transceiver in which the invention can be utilized
  • figure 3 shows a discovery frame according to the IrDA protocol with the XBOF character having the value OxFF,
  • figure 4 shows a discovery frame according to the IrDA protocol with the XBOF character having the value OxCO, and
  • figure 5 shows an example of the signals in a circuit according to the invention.
  • FIG. 1 shows a situation in which the invention can be utilized.
  • a mobile telephone 1 is connected to a personal computer 2, which is shown in the figure as a laptop com- puter, via a communications link 3.
  • the actual communication takes place between a transceiver 4 arranged on the mobile telephone 1 and a transceiver 5 arranged on the computer 2.
  • the type of the communications link 3 can be selected from several different types, such as a wired connection, a short-range radio link or an infrared link.
  • IrDA Infrared Data Association
  • FIG. 2 shows an example of the hardware configuration of the infrared transceiver 4 and its relating control circuitry 6.
  • the infrared transceiver 4 includes a transmitter diode 7, which will typically be an infrared light emitting diode, and a receiver diode 8, which will typically be a photo diode.
  • the transceiver also contains a pulse encoder and a pulse decoder.
  • the control circuitry 6 is normally implemented in an ASIC, which could also contain other control circuits for the mobile telephone 1.
  • One part of the control circuitry 6 is the IR block 9.
  • This block converts a byte stream into a pulse train for transmission via the pulse encoder and the transmitter diode 7, and it also converts the pulses received via the receiver diode 8 and the pulse decoder into a byte stream.
  • the data, i.e. the pulse train, from the IR block 9 to the transmitter diode 7 are transferred via the line TX, while data from the receiver diode 8 to the IR block are transferred via the line RX.
  • Power to the infrared transceiver 4 is supplied from a battery (not shown) , and, as shown, power may be supplied separately to the receiver and transmitter parts of the transceiver. In the figure the power to the transmitter part is supplied through the switch 10 that may be controlled from the control circuitry 6.
  • the other power saving solution is to switch off the power supply to the transmitter part by means of the switch 10. In this way the transmitter part is switched off completely, while the receiver part can still be active, provided the SD signal is inactive.
  • the transmitter part only needs to be switched on when data are actually to be transmitted from the transmitter, and since the control circuitry 6 controls the data transmission as well as the power switch 10, it is easy to switch off the transmitter part of the transceiver 4 as soon as it is not needed for transmission of data.
  • the SD signal normally has to be inactive all the time to ensure that the receiver part of the transceiver is ready to receive data at any time, in case such data should arrive. As will be explained later, this is especially important because some types of data are only sent once.
  • the fact that at least the receiver part of the transceiver must be switched on all the time means that the transceiver continuously has a certain power consumption.
  • Some typical figures are that virtually no current is drawn when SD is active, i.e. the whole transceiver is shut down, while a current in the range from 300 ⁇ A to 1 mA is drawn when the transmitter part as well as the receiver part are switched on.
  • the current may be reduced by approximately 25%, but still the remaining consumption is considerable.
  • transceiver will be used to describe not only the transceiver hardware described above, but also the software controlling the hardware.
  • the transceivers 4 and 5 in this ex- ample make use of the IrDA protocol, and the data are transmitted according to the serial infrared procedure IrDA-SIR (IrDA Serial InfraRed) of this protocol.
  • IrDA-SIR IrDA Serial InfraRed
  • a transceiver can be in a primary mode or in a secondary mode. In the primary mode the transceiver actively searches for other transceivers of the same type, normally because it has information to transmit. In the secondary mode a transceiver only listens for a transceiver in primary mode to contact it. Normally, there are long periods with no data transmission, and both transceivers 4, 5 will thus be in the secondary mode.
  • the system will enter the IrDA Discovery Mode and the transceiver 5 will change to the primary mode, thus becoming a primary transceiver.
  • the primary transceiver will search for a secondary transceiver by transmitting a series of discovery frames having start characters in front of them.
  • IrDA Discovery Mode the primary transceiver will repeat the series of discovery frames with an interval or period which is typically set to 3 seconds although other values are possible as well.
  • the discovery frame In order to ensure that the secondary transceiver is able to detect the discovery frames, the discovery frame must include at least some bits which are different from the situation where no data are sent.
  • the discovery frame must include at least some "0" bits. This is achieved in that the discovery frame starts with 10 XBOF characters, which will be explained below.
  • the discovery frames are sent with a bit rate of 9600 baud.
  • IrDA Discovery Mode a sequence of e.g. six, eight or 16 discovery frames, each starting with 10 XBOF characters, is transmitted from the primary transceiver every period.
  • this is not the case in another mode, i.e. the IrDA Ultra Mode, which is used for example when sending a so-called vCard (business card) .
  • vCard business card
  • This case is important because the information is only sent once, and there is no option for confirmation or retransmission.
  • the 10 XBOF characters must be detected the first time. Otherwise, the frame format is the same as in IrDA Discovery Mode.
  • the XBOF character has the value OxFF, but some older devices use the value OxCO and to ensure compatibility with these devices this value should also be supported.
  • SIR the characters are transmitted in an asynchronous serial format with the parameters 1 start bit ("0"), 8 data bits, no parity bit and 1 stop bit ("1"), which is a total of 10 bits. The bits in the character are transmitted from the least significant bit
  • OxFF is exchanged as 0, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  • OxCO is exchanged as 0, 0, 0, 0, 0, 0, 1, 1, 1. Note that the 0s result in light pulses while Is do not. Is can thus not be differentiated from silence, so the detection relies on the 0s.
  • start characters The purpose of the start characters is to "wake up" the receiver to ensure that it will actually receive the following data packets. There is no information content as such in the start characters.
  • the receiver - when it is in the secondary mode waiting for another transceiver to send a discovery frame - is continuously switched on and off in order to save power. This means that the receiver is shut down for certain intervals.
  • the receiver just has to be switched on often enough and long enough to be able to detect at least one of the zeros in the ten XBOF characters. Then if a zero, and thus a start character, is detected, the receiver is maintained on of course as long as data still arrive from the other end.
  • the eye period can be extended to 1.146 milliseconds (11 bits), and similarly the repetition period can be reduced a lit- tie bit. Practical tests have shown that a repetition period of 9 milliseconds with an eye period for the receiver of 1.4 milliseconds is completely secure, but values closer to the theoretical values mentioned above are probably possible.
  • A illustrates the signal SD in the transceiver 4 when this transceiver is in the secondary mode waiting for the other transceiver 5 to contact it. It will be seen that in each period T P the signal SD is low (i.e. not active) only in the eye period T e .
  • B correspondingly shows that the receiver part of the transceiver 4 is switched on, i.e. ready to receive incoming optical signals in the eye periods T e , while it is shut down in the rest of the period.
  • C shows a discovery frame sent from the other transceiver 5, and finally D shows what is actually received in the transceiver 4.
  • C and D correspond to figure 3, i.e.
  • the XBOF character has the value OxFF and the ze- ros are represented by the black lines.
  • the period T P is selected to be shorter than, but close to, the duration T x of the ten XBOF characters, and the eye period T e selected to be longer than, but close to, the duration of one XBOF character.
  • a discovery frame from the transceiver 5 begins, and in the shown example the first four zeros are not detected because the transceiver is shut down.
  • the SD signal becomes low and the receiver is again ready to receive for an eye period T e , i.e. until the time t 3 .
  • the zero of the fifth XBOF character lies in this eye period and is thus detected.
  • the SD signal was otherwise expected to be activated again at the time t 3 , as is shown with the dashed lines in A, it is now kept low and the receiver is ready to receive the remaining XBOF characters and the follow- ing data.
  • the receiver is now kept in the switched on state as long as data are exchanged between the two transceivers. A certain time after the exchange of data has been concluded, the receiver returns to the state in which it is only switched on in the eye periods.
  • the power consumption of the receiver part of the transceiver in the discovery mode can also be reduced to close to one tenth of the normal power consumption.
  • the eye period has to be a little bit longer and the repetition period a little bit shorter, the power consumption can still be reduced to maybe 12 or 15% of the normal power consumption.
  • the transceiver When an infrared interface without this solution is implemented in a mobile telephone, the transceiver typically consumes about 10% of the total stand-by current of the phone. Therefore, the user will often prefer to switch the interface on and off manually to save power. With the solution implemented this value can be reduced to maybe 1 or 2%, which means that the transceiver can now be switched on the whole time without affecting the stand-by time of the phone very much. When the transceiver can be switched on all the time, a user interface to switch it on and off is no longer needed, and it can thus be removed from the phone, which gives a simpler design of the phone user interface. It should be noted that the feature activates itself when there is no other transceiver in range, but also when another device has actually been found but does not contact the transceiver in which the solution is implemented.
  • transceiver is always on also means that it is always ready to receive an electronic business card that is beamed to the device. This is important because such a business card is only transmitted once. To- day an IR interface has to be enabled or switched on for some time before a business card can be received.
  • the SD signal can be controlled from either hardware or software, and thus the solution itself can also be i ple- mented in hardware as well as in software, dependent on what is most convenient in a given device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Human Computer Interaction (AREA)
  • Communication Control (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Optical Communication System (AREA)

Abstract

Cette invention concerne un dispositif (4) d'interface de communications comportant des circuits servant à recevoir des signaux numériques sous la forme de caractères conformément à un protocole définissant qu'une liaison de télécommunication est initialisée par une série de caractères de départ, chacun de ces caractères présentant une durée spécifiée. Les circuits récepteurs peuvent adopter un premier état, dans lequel les caractères peuvent être détectés, et un deuxième état, dans lequel la détection des caractères est impossible. La consommation d'énergie est supérieure dans le premier état que dans le deuxième état. Le dispositif peut périodiquement activer les circuits récepteurs en alternance entre le premier état et le deuxième état pour une durée inférieure à celle de la série des caractères de départ. Dans chaque période, les circuits récepteurs adoptent le premier état pour une durée supérieure à celle d'un caractère de départ. Une liaison de télécommunication est établie si un caractère est détecté. La consommation d'énergie peut être considérablement réduite sans causer à l'utilisateur de désagréments inutiles et de perte de temps.
PCT/EP2002/001695 2001-02-27 2002-02-15 Dispositif d'interface de communications servant a recevoir des signaux numeriques WO2002069570A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2002568575A JP4049314B2 (ja) 2001-02-27 2002-02-15 デジタル信号受信用通信インターフェース装置
US10/468,260 US7580677B2 (en) 2001-02-27 2002-02-15 Communications interface device for receiving digital signals

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP01610016A EP1235388B1 (fr) 2001-02-27 2001-02-27 Interface de communication pour recevoir des signaux numériques
EP01610016.6 2001-02-27
US27204201P 2001-03-01 2001-03-01
US60/272,042 2001-03-01

Publications (1)

Publication Number Publication Date
WO2002069570A1 true WO2002069570A1 (fr) 2002-09-06

Family

ID=26077304

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/001695 WO2002069570A1 (fr) 2001-02-27 2002-02-15 Dispositif d'interface de communications servant a recevoir des signaux numeriques

Country Status (2)

Country Link
JP (1) JP4049314B2 (fr)
WO (1) WO2002069570A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1515493A3 (fr) * 2003-09-09 2005-11-09 Samsung Electronics Co., Ltd. Procédé pour connecter un terminal mobile multi-mode muni d'un module bluetooth à un point d'accès bluetooth

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0615364A1 (fr) * 1993-03-06 1994-09-14 NCR International, Inc. Système de communication de données sans fils avec fonction d'économie d'énergie
US5907418A (en) * 1995-08-09 1999-05-25 Motorola, Inc. Apparatus for infrared channel and method therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0615364A1 (fr) * 1993-03-06 1994-09-14 NCR International, Inc. Système de communication de données sans fils avec fonction d'économie d'énergie
US5907418A (en) * 1995-08-09 1999-05-25 Motorola, Inc. Apparatus for infrared channel and method therefor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MILLAR I ET AL: "THE IRDA STANDARDS FOR HIGH-SPEED INFRARED COMMUNICATIONS", HEWLETT-PACKARD JOURNAL, HEWLETT-PACKARD CO. PALO ALTO, US, vol. 49, no. 1, 1 February 1998 (1998-02-01), pages 10 - 25, XP000766837 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1515493A3 (fr) * 2003-09-09 2005-11-09 Samsung Electronics Co., Ltd. Procédé pour connecter un terminal mobile multi-mode muni d'un module bluetooth à un point d'accès bluetooth
US7606600B2 (en) 2003-09-09 2009-10-20 Samsung Electronics Co., Ltd Method of connecting a mobile terminal including a bluetooth module and a bluetooth access point

Also Published As

Publication number Publication date
JP2004538674A (ja) 2004-12-24
JP4049314B2 (ja) 2008-02-20

Similar Documents

Publication Publication Date Title
US5684472A (en) Method and apparatus for remotely accessing meter status information in a meter reading system
US6810216B1 (en) Fast infrared transceiver with reduced power consumption
US5392023A (en) Data communication system with automatic power control
US20070149244A1 (en) Power-save system and method
KR100549763B1 (ko) 통합된 주 송신기 및 보조 송신기를 갖는 무선 통신 장치및 방법
JPH08265400A (ja) コードレス電話のための適応的電力サイクリング
GB2292503A (en) Radio Transceiver For Use With a Data Processor
CA2496958A1 (fr) Reseaux personnels
US7580677B2 (en) Communications interface device for receiving digital signals
JP2003124862A (ja) 通信装置
US20030017854A1 (en) Wireless mobile computing telephone dialer for use with landline telephone systems
WO2002069570A1 (fr) Dispositif d'interface de communications servant a recevoir des signaux numeriques
JP3216711B2 (ja) 通信装置、通信システムおよび通信方法
EP1008960A3 (fr) Système de communication radio de données
KR101094224B1 (ko) 이동통신단말기의 송신 전력 제어 방법 및 이를 위한이동통신단말기
JPH01200752A (ja) コードレス電話装置
JP3342132B2 (ja) ファクシミリ受信用携帯電話機
JPH11186967A (ja) 赤外線通信装置
GB2350038A (en) Infra red communications system with communications devices storing connection details of other devices
JPH0779355B2 (ja) 信号伝送装置
JPH10303818A (ja) 赤外線通信システムおよび赤外線通信方法
KR20010058731A (ko) 무선 텔렉스 제어 장치
JP2001285200A (ja) 赤外線データ通信装置およびターンアラウンド・タイム設定方法
JPH04167158A (ja) 端末装置立ち上げ方式
JP2005303596A (ja) 赤外線通信モジュールの制御方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC 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 MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM 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 TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2002568575

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: 10468260

Country of ref document: US

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase