WO2003105355A1 - 通信装置 - Google Patents
通信装置 Download PDFInfo
- Publication number
- WO2003105355A1 WO2003105355A1 PCT/JP2003/007287 JP0307287W WO03105355A1 WO 2003105355 A1 WO2003105355 A1 WO 2003105355A1 JP 0307287 W JP0307287 W JP 0307287W WO 03105355 A1 WO03105355 A1 WO 03105355A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmission
- antenna
- reception
- output
- processing means
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
- H04B1/48—Transmit/receive switching in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter
-
- 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
Definitions
- the present invention relates to a communication apparatus suitable to be applied to a communication system performing wireless communication in a relatively short distance.
- Bluetooth registered trademark
- a short distance wireless communication system using a relatively high frequency wireless signal such as Bluetooth communication has no directivity and transparency compared to an infrared communication method using an infrared signal. It has high merits and is expected to increase the number of compatible devices in the future.
- Device A When Bluetooth communication is used, the device you want to start communication (hereinafter referred to as Device A) sends, as a broadcast message, an inquiry message for finding devices in the vicinity. Then, the device that receives the inquiry message from the device A returns a response message to the inquiry message to the device A.
- Device A is each device around By sequentially receiving these response messages, it is possible to discover multiple communicable devices present in the surrounding area. Based on the information in these response messages, device A selects and identifies the device to be connected, and executes connection processing for that device. At this time, when response messages from multiple devices are received, they are usually displayed in a list and often selected by the user.
- Bluetooth communication in addition to establishing a communication path, it is clearly defined as a profile what applications and services are to be implemented in that communication path.
- the profiles include a serial port profile that implements serial communication and a personal area networking profile that implements a personal area network.
- a service discovery protocol hereafter referred to as SD is specified as a procedure to determine what these services and what services will actually be implemented.
- the device A sends a query message according to SDP to the device it wants to connect (hereinafter referred to as device B) according to what service the device B provides, and the device B makes an inquiry from the device A It receives a message, and sends information related to the service that it can provide to device A as a response message to device A. If device A receives the response message and device B provides the desired service, device A makes a communication request for that service, and the desired service between device A and device B can be started. It will be
- the basic communication procedure in Bluetooth communication is as follows.
- Device A first transmits an inquiry message for finding surrounding devices and receives a response message to it.
- a desired device is selected from among the devices that have responded, and the device is inquired if there is a desired service, and a communication request for that service is made.
- Bluetooth SIG Inc. The Bluetooth standard is managed by Bluetooth SIG Inc., and a specification document describing the details is issued by Bluetooth SIG Inc.
- the inquiry message for discovering devices in the vicinity is all devices within the communication range (for example, 10 meters to 100 meters). It becomes. Therefore, when there are many communicable devices in the vicinity, a huge number of response messages will be received.
- the device information contained in those response messages is presented by displaying it on a display etc., and the user needs an operating procedure to select the desired device, but there are many devices around. In this case, the user spends a lot of time in the selection operation, and there is a problem that the usability is deteriorated.
- the information provided by the device such as the ID, which may impose an excessive burden on the user. was there.
- the reach of the inquiry message which is a device search signal
- the reach of the inquiry message which is a device search signal
- the amplifier consists of a variable amplifier, and the control of the amplification factor of the variable amplifier controls the transmission power to limit the reach of the inquiry message to a short distance. Therefore, there is a problem that control of the transmission amplifier is required and complicated power control processing is required.
- the present invention has been made in view of such a situation, and in a communication apparatus applied to a communication system that requires a signal for searching for a device such as Bluetooth communication, the search signal is transmitted.
- the purpose is to limit the reach of the signal with a simple and good configuration only if Disclosure of the invention
- a transmission processing unit that processes a transmission signal
- an antenna that wirelessly transmits the output of the transmission processing unit
- an output restricting unit is provided which attenuates the output of the transmission processing unit and outputs the signal from the antenna.
- the output control means is configured of an attenuator selectively disposed between the transmission processing means and the antenna.
- a power control unit In this case, the variable attenuator is arranged between the transmission processing means and the antenna, and in the case of transmission in a predetermined state, the amount of attenuation of the variable attenuator is set large. By doing this, output control can be easily performed at the timing of transmitting the search signal only by controlling the attenuation of the variable attenuator.
- a fourth invention is the communication apparatus according to the first invention, wherein the output regulation means comprises first and second antennas to which the output of the transmission processing means is selectively supplied, and the sensitivity of the first antenna More specifically, in the case where transmission is performed in a predetermined state by lowering the sensitivity of the second antenna, transmission is performed by the second antenna, and transmission is performed by the first antenna in other cases. It is. By doing this, it is possible to easily regulate the output only by the antenna selection process.
- the gain of the transmission amplifier of the transmission processing means is further lowered. . By doing this, it is possible to control transmission power more efficiently.
- a sixth aspect of the invention is the communication apparatus according to the first aspect of the invention, wherein the antenna is also connected to a reception processing means for processing a reception signal, and the antenna outputs a signal that is received and supplied to the reception processing means.
- the level of the received signal is limited to a low level by the regulation means and supplied to the reception processing means.
- a seventh aspect of the invention is the communication apparatus according to the first aspect of the invention, wherein the antenna is also connected to a reception processing means for processing a reception signal, and the antenna outputs a signal that is received and supplied to the reception processing means.
- Regulation PT / JP03 / 07287 Means of limiting the reception signal level low and supplying it to the reception processing means, and further limiting the reception signal level low by the output regulation means, the gain of the reception amplifier provided in the reception processing means To make it lower. By doing this, it is possible to control the receiving power more efficiently.
- FIG. 1 is a block diagram showing a configuration example of a communication apparatus according to an embodiment of the present invention.
- FIG. 2 is a circuit diagram showing a configuration example of a ⁇ -type attenuator.
- FIG. 3 is a flowchart showing an example of selection processing according to an embodiment of the present invention.
- FIG. 4 is a timing diagram showing an example of communication according to an embodiment of the present invention.
- FIG. 5 is a block diagram showing a configuration example (an example using a variable attenuator) according to another embodiment of the present invention.
- FIG. 6 is a block diagram showing a configuration example (example of combining transmission control and variable attenuator) according to another embodiment of the present invention.
- FIG. 7 is a block diagram showing a configuration example (an example of combining transmission control and reception control with a variable attenuator) according to another embodiment of the present invention.
- FIG. 8 is a block diagram showing a configuration example (example using a variable attenuator) according to another embodiment of the present invention.
- FIG. 9 is a perspective view showing an example of the device shape in the case of the configuration example shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- the present invention is applied to a wireless communication apparatus which performs wireless communication by Bluetooth communication, which is one of relatively short distance wireless communication systems. Therefore, when it is desired to start communication with this communication device, as already described in the section of the Related Art, an inquiry message (hereinafter referred to as a device search signal) for finding a device present in the periphery is referred to. Send. Then, it receives a response message (response signal) to the device search signal, finds a device present in the vicinity, and performs processing for connecting a wireless communication connection with the discovered device. It is configured to start radio communication.
- the transmission output and the reception sensitivity of this communication device are normally set so that wireless communication can be performed with a communication terminal of the same communication method within a radius of about 1 O m centering around the own station, for example. Yes.
- the transmission output is limited only when transmitting the device search signal, and, for example, about several tens cm in radius around the own station. Wireless communication can be performed only with communication terminals in the range of.
- the wireless communication apparatus of this embodiment is configured as a wireless terminal configured as, for example, a portable information processing terminal
- FIG. 1 is a diagram showing an example of the configuration as the communication apparatus. It is.
- the wireless terminal 10 in this example includes a control unit 1 1 that controls wireless communication, and under the control of the control unit 1 1, processing of a transmission signal in the transmission unit 13 in the wireless unit 12 and a reception unit It is configured to execute the processing of the received signal in 14.
- the transmitter 13 performs transmission signal processing such as encoding, packetization, modulation processing, frequency conversion, and the like that conform to the wireless communication method (ie, Bluetooth communication) to which this communication apparatus is applied.
- circuits such as a transmission amplifier and a filter are also incorporated in the transmission unit 13. The transmission signal is processed by these circuits.
- the frequency adapted to the wireless communication system to which this communication apparatus is applied 03 07287 Performs reception processing such as conversion, demodulation processing, packet data separation processing, and decoding.
- circuits such as a reception amplifier and a filter are also incorporated, and processing of reception signals is performed by these circuits.
- the wireless terminal 10 of this example is provided with one antenna 17 for both transmission and reception, and this antenna 17 is connected to the wireless unit 12.
- a switch 1 5 is provided between the radio unit 12 and the antenna 1 7, and a system in which the attenuator 1 6 is inserted by switching the switch 1 5, A system in which the attenuator is not inserted is selected.
- the transmission signal output unit of the transmission unit 13 and the reception signal input unit of the reception unit 14 are commonly connected to the movable contact 15 m of the changeover switch 15, and
- the first fixed contact 15a is directly connected to the charging point of the antenna 17, and the second fixed contact 15b of the switch 15 is connected to the antenna 17 through the attenuator 16. It is connected to the feed point.
- the switching of the movable contact 15 m of the switch 15 is controlled by the control unit 1 1.
- the switch 15 is shown as a mechanical switch in the figure, it goes without saying that the switch 15 may be constituted by an electronic switch such as a semiconductor switch.
- Attenuator 16 various general attenuators using resistors etc. can be applied. For example, as shown in FIG. 2, a ⁇ attenuator composed of three resistors 16a, 16b and 16b can be applied.
- the signal level to be passed is reduced by 40 to 50 d B m.
- control of switch 1 5 by control unit 1 1 is the transmission of a search signal when wireless terminal 10 finds a communication terminal (communication station) existing in the vicinity
- the movable contact 1 5 m of switch 1 5 is the first Attenuator 16 is kept from being connected between radio section 1 2 and antenna 1 7 while being kept connected to fixed contact 15 a side.
- Fig. 3 is a flowchart showing the control process of this switch 15.
- the search distance of the search signal to be transmitted next is the normal distance (ie, the distance Determine whether it is about 10 m) (step S 1 2).
- the distance is normal, it is assumed that the movable contact 15m of the switch 15 is connected to the first fixed contact 15a (step S13), which serves as an output restricting means. Do not connect each attenuator 1 6 to antenna 1 7.
- the search distance of the terminal is not normal (that is, limited to a shorter distance than normal), move the movable contact 15 m of switch 15 to the second fixed contact 15 b.
- step S 1 4 attenuator 1 6 as a means of output regulation is connected to antenna 1 7. Then, with the connection of step S13 or S14, the search signal, which is an inquiry message for finding the neighboring station, is transmitted (step S15).
- the transmission of the search signal is periodically repeated at the time of query processing. That is, for example, as shown in FIG. 4, the first search signal transmission (inquiry # 1) is performed for a predetermined period, and then, after a certain amount of time has elapsed, the next search signal transmission (inquiry # 2) is performed for a predetermined period. After that, the transmission of the search signal is repeatedly and intermittently performed until the response signal can be received or until the determined time elapses. In the period between each query # 1, # 2 ' ⁇ ⁇ ⁇ ⁇ , for example, it waits to receive a response message sent from the terminal that received the search signal.
- the movable contact 15 m of switch 15 is the first fixed contact
- the communication distance not passing through the attenuator 1 6 is normal (ie, about 10 m)
- the switch is switched.
- the 15 movable contacts 15 m are connected to the second fixed contact 15 b so that the communication distance passed through the attenuator 1 6 is to transmit a short distance (ie, several tens of cm).
- the search for terminals within a radius of about 10 m and the search for terminals within a radius of about several tens of cm may be repeated.
- fix the movable contact 1 5 m of switch 1 5 to one side and search for a terminal within the radius of about 1 O m It may be set to search only for one or the other distance in the search for terminals within the range of cm.
- the switch 1 5 is movable during the period of waiting for the response signal to be received between each query # 1, # 2, # 3 ...
- the contact point 15 m is connected to the first fixed contact point 15 a, and the signal is supplied from the antenna 17 to the receiver 14 without passing through the attenuator 16. It may be possible to prevent
- the movable contact 15 m of switch 15 is connected to the second fixed contact 15 b even during the reception period.
- the reception signal is supplied from the antenna 1 7 through the attenuator 1 6 to the reception unit 14, and the signal whose reception level is lowered is supplied to the reception unit 14. You may as well.
- the wireless communication distance is limited to a short distance, if the transmission power of the other party is the same as normal, even if the reception sensitivity drops to some extent, the signal can be received and processed normally.
- the attenuator 1 JP03 / 07287 The selective connection configuration allows the reach of the transmit signal to be changed without changing the processing (for example, the gain of the transmission amplifier) in the transmission system circuit at all. Changing the reach of the search signal can be performed simply by switching the switch. Therefore, for example, the transmission output is set low only when transmitting the search signal of the short-range search range, when transmitting the search signal of the normal distance, or when transmitting other signals or during the reception period. The return of the transmission signal output to normal can be easily implemented simply by switching the switch, and can be realized with a simple control processing configuration.
- the attenuator is used to reduce the output of the transmission signal, the amount of attenuation can be set freely by selecting the values of the elements (resistors) that make up the attenuator, and a relatively large amount of attenuation can be achieved.
- it is easy to switch between transmission with a radius of about 10 m as the reach distance and transmission with a radius of about several tens of cm as the reach distance with a simple configuration. Have effects that can be implemented.
- the insertion of the attenuator is switched by a switch, and the output regulating means selectively arranged is configured, but a variable attenuator capable of variably setting the attenuation amount is used. It may be a configuration to use. That is, for example, as shown in FIG. 5, the wireless terminal 20 includes a control unit 21 that controls wireless communication, and the control unit 21 controls the transmission unit 23 in the wireless unit 22. The processing of the transmission signal in the above and the processing of the reception signal in the reception unit 24 are executed.
- variable attenuator 25 The attenuation amount of the variable attenuator 25 is controlled by, for example, the control unit 21. In the variable attenuator 25, it is possible to select a state in which the signal level passing therethrough is hardly attenuated and a state in which the signal level is reduced by about 40 to 50 dB m. Or the amount of attenuation between them You can also choose it.
- the amount of attenuation of the variable attenuator 25 can be changed instead of the process of switching the switch 15 in the wireless terminal 10 having the configuration shown in FIGS. 1 to 3 described above.
- the same processing as the above-described wireless terminal 1 0 can be performed by making the amount of attenuation large at the time of transmission of a search signal in a short distance and the like and making the amount of attenuation small otherwise.
- the wireless terminal 20 since there is no need to change the process at all in the transmitting unit 23 and the receiving unit 24 in the wireless unit 22 regardless of the communication distance. Can be done easily and quickly.
- the configuration is such that the amount of attenuation in the variable attenuator 25 can be freely selected, for example, it is possible to freely variably set the reachable distance when transmitting a search signal in a short distance by user setting. It will be possible. For example, even if the user inputs a distance for reaching the search signal, the distance is converted to an attenuation amount on the control unit 21 side, and the obtained attenuation amount is set to the variable attenuator 25. good.
- the wireless terminal 30 includes a control unit 31 that controls wireless communication, and the control unit 31 controls the transmission unit 33 in the wireless unit 32.
- the processing of the transmission signal in the above and the processing of the reception signal in the reception section 34 are executed.
- the gain of the transmission amplifier (not shown) in the transmission unit 33 is controlled by the transmission control unit 35.
- variable attenuator 3 6 The attenuation amount of this variable attenuator 3 6 is, for example, the control unit 3 1 Control by The variable attenuator 3 6 allows selection between a state in which the signal level passing therethrough is hardly attenuated and a state in which the signal level is reduced by about 40 to 50 d B m.
- the transmission amplifier in the transmission unit 33 is configured to be able to change the signal level by about 10 to 20 dBm.
- the wireless terminal 40 includes a control unit 41 that controls wireless communication, and under the control of the control unit 41, the transmitting unit 43 in the wireless unit 42 is The processing of the transmission signal and the processing of the reception signal in the reception unit 44 are executed.
- the gain of the transmission amplifier (not shown) in the transmission unit 43 is controlled by the transmission control unit 45, and the reception amplifier in the reception unit 44 (not shown). The gain of) is controlled by the reception control unit 46.
- variable attenuator 4 7 The attenuation amount of the variable attenuator 4 7 is controlled by, for example, the control unit 4 1.
- the variable attenuator 47 it is possible to select between a state in which the signal level passing therethrough is hardly attenuated and a state in which the signal level is reduced by about 40 to 50 d B m.
- the transmission amplifier in the transmission unit 43 and the reception amplifier in the reception unit 44 are configured to be able to change the signal level by about 10 to 20 dBm.
- a search distance is limited to a short distance. Not only when transmitting the search signal, but also when receiving the response signal of the search signal, it is possible to select a larger amount of attenuation.
- variable attenuators instead of the variable attenuators shown in FIGS. 6 and 7, it may be configured to use an attenuator with a fixed amount of attenuation as shown in FIG. 1 and a changeover switch.
- the wireless terminal 50 includes a control unit 51 that controls wireless communication, and the control unit 51 controls the transmission unit 5 in the wireless unit 52. Processing of the transmission signal in 3 and processing of the reception signal in the reception unit 54 are executed. In this case, the gain of the transmission amplifier (not shown) in the transmission unit 53 is controlled by the transmission control unit 55.
- the output portion of the transmission signal of the transmission portion 5 3 and the input portion of the reception output of the reception portion 5 4 are commonly connected to the movable contact 5 6 m of the switching switch 5 6.
- the first fixed contact 5 6 a of the changeover switch 5 6 is connected to the transmitting (receiving) sensitive antenna 5 7.
- the second fixed contact 56 b of the switching circuit 56 is connected to the antenna 58 having poor transmission (reception) sensitivity.
- the antenna 57 with high transmission sensitivity is, for example, an antenna of a configuration suitable for the signal of 2.4 GHz band used in the Bluetooth standard.
- the antenna 58 with poor transmission sensitivity has a configuration in which a simple signal line is used as an antenna terminated with a certain impedance on the ground, or a component that substantially functions as an antenna is not provided. Do.
- the movable contact 56m of the switch 56 is connected to the first fixed contact 56a side so that wireless transmission can be performed well.
- the gain of the transmission amplifier in the transmission unit 53 may be reduced to compensate for the shortage of the signal limitation amount due to the switching of the antenna sensitivity.
- an attenuator may be provided between the second fixed contact 5 6 b of the switch 5 6 and the antenna 5 8.
- antennas 57 and 58 when switching between two antennas 57 and 58, for example, as an antenna with high sensitivity, an antenna with low directivity is used, and an antenna with low sensitivity is used.
- antennas with high directivity may be used. In this way, when transmitting a search signal using an antenna with high directivity, the range within which the search signal can be reached is limited, and the reach distance is substantially shortened. The same effect is obtained.
- the wireless terminal 50 when selectively using an antenna having no directivity and an antenna having high directivity, the wireless terminal 50 should display the direction in which the antenna having the high directivity has directivity. You may as well. For example, as shown in FIG. 9, an approach position indication 50 a showing the direction of the directivity of the antenna may be displayed on the outside of the wireless terminal 50 configured as a portable information terminal by printing or the like. Then, by making another device approach in the direction of the display 50 a, the approached device can be searched.
- the polarization plane of the antenna may be switched instead of such directivity switching.
- an antenna with circular polarization may be used.
- a short distance wireless communication unit such as a Bluetooth communication is used for a portable information terminal, a personal computer device, a mobile phone device, a digital camera, a digital video camera, a digital television receiver, a portable music player, a head phone, etc. It may be built in (or externally attached) to perform similar processing.
- the transmission output of the search signal can be controlled simply by providing the output regulation means, and the output control can be performed easily and quickly. For example, only the communication device disposed in the vicinity of the communication device is searched. Then, the process of searching for and connecting other communication devices at a certain distance away can be realized with a simple configuration.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003242088A AU2003242088A1 (en) | 2002-06-10 | 2003-06-09 | Communication apparatus |
US10/517,221 US20060052069A1 (en) | 2002-06-10 | 2003-06-09 | Communication apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002169012A JP2004015655A (ja) | 2002-06-10 | 2002-06-10 | 通信装置 |
JP2002-169012 | 2002-06-10 |
Publications (1)
Publication Number | Publication Date |
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WO2003105355A1 true WO2003105355A1 (ja) | 2003-12-18 |
Family
ID=29727712
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/007287 WO2003105355A1 (ja) | 2002-06-10 | 2003-06-09 | 通信装置 |
Country Status (4)
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US (1) | US20060052069A1 (ja) |
JP (1) | JP2004015655A (ja) |
AU (1) | AU2003242088A1 (ja) |
WO (1) | WO2003105355A1 (ja) |
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JP4922812B2 (ja) * | 2007-04-16 | 2012-04-25 | 三洋電機株式会社 | 通信方法ならびにそれを利用した端末装置および通信システム |
JP2008271443A (ja) * | 2007-04-24 | 2008-11-06 | Brother Ind Ltd | 無線送信装置及び無線通信装置 |
JP2009152705A (ja) * | 2007-12-19 | 2009-07-09 | Toshiba Corp | 電子計算機および切替回路 |
US8280581B2 (en) * | 2008-05-07 | 2012-10-02 | Spx Corporation | Dynamic discovery of vehicle communication interface device and method |
JP4866456B2 (ja) * | 2009-09-15 | 2012-02-01 | 東芝テック株式会社 | Rfタグリーダライタ |
DE102010015650A1 (de) * | 2010-04-14 | 2011-10-20 | Pilz Gmbh & Co. Kg | Vorrichtung zur drahtlosen Vernetzung von Geräten der Automatisierungstechnik |
JPWO2012057094A1 (ja) * | 2010-10-25 | 2014-05-12 | 和浩 山本 | 通信装置 |
JPWO2013157139A1 (ja) * | 2012-04-20 | 2015-12-21 | 和浩 山本 | 上限固定通信装置 |
JP6146866B2 (ja) * | 2014-03-03 | 2017-06-14 | 日本電信電話株式会社 | 無線通信装置及び無線通信方法 |
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2002
- 2002-06-10 JP JP2002169012A patent/JP2004015655A/ja active Pending
-
2003
- 2003-06-09 US US10/517,221 patent/US20060052069A1/en not_active Abandoned
- 2003-06-09 AU AU2003242088A patent/AU2003242088A1/en not_active Abandoned
- 2003-06-09 WO PCT/JP2003/007287 patent/WO2003105355A1/ja active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH02202237A (ja) * | 1989-01-31 | 1990-08-10 | Nec Corp | 携帯電話装置 |
JPH0951285A (ja) * | 1995-08-04 | 1997-02-18 | Canon Inc | コードレス通信装置及びコードレスシステム |
JPH10336068A (ja) * | 1997-06-03 | 1998-12-18 | Matsushita Electric Ind Co Ltd | 無線通信機 |
JPH11103259A (ja) * | 1997-09-29 | 1999-04-13 | Omron Corp | 無線データ通信装置 |
JP2001144781A (ja) * | 1999-11-18 | 2001-05-25 | Toshiba Corp | 通信システム、通信装置、及び通信方法 |
JP2002009695A (ja) * | 2000-05-05 | 2002-01-11 | Nokia Mobile Phones Ltd | 通信装置および通信方法 |
Also Published As
Publication number | Publication date |
---|---|
JP2004015655A (ja) | 2004-01-15 |
US20060052069A1 (en) | 2006-03-09 |
AU2003242088A1 (en) | 2003-12-22 |
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