JP2004054515A - Radio tag system, reader/writer and data writing/reading method - Google Patents

Radio tag system, reader/writer and data writing/reading method Download PDF

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Publication number
JP2004054515A
JP2004054515A JP2002209964A JP2002209964A JP2004054515A JP 2004054515 A JP2004054515 A JP 2004054515A JP 2002209964 A JP2002209964 A JP 2002209964A JP 2002209964 A JP2002209964 A JP 2002209964A JP 2004054515 A JP2004054515 A JP 2004054515A
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JP
Japan
Prior art keywords
tag
radio wave
writer
data
reader
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Pending
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JP2002209964A
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Japanese (ja)
Inventor
Kunio Fukuda
福田 邦夫
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Sony Corp
ソニー株式会社
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Priority to JP2002209964A priority Critical patent/JP2004054515A/en
Publication of JP2004054515A publication Critical patent/JP2004054515A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To perform data writing/reading for a tag while economically ensuring the operating power source of a tag, and largely ensuring a communication distance between the tag and a reader/writer. <P>SOLUTION: A tag 10 is made to receive radio waves transmitted from a portable telephone set 3 as a general radio transmission source periodically put in a radio transmitting state during a predetermined period, and the tag 10 is put in an operable state by using the transmitted radio waves as an operating power source, and a reader/writer 20 is made to receive the transmitted radio waves. While the transmitted radio waves are received, the writing of data in the tag 10 or the reading of data from the tab 10 is performed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a wireless tag system in which the operating power supply of the wireless tag itself is easily and economically secured, so that a longer communication distance between the wireless tag and the reader / writer is secured. The present invention relates to a read writer that is used as one component and can economically ensure a longer communication distance with a wireless tag, and further relates to a method of writing / reading data to / from a wireless tag by the read writer.
[0002]
[Prior art]
Up to now, an RFID (Radio Frequency Identification) system (also referred to as an ID system or a data carrier system, etc., and RFID is an abbreviation of RFID system) has been put to practical use. This system is, so to speak, a "recognition system using high frequency (wireless)". The system consists of a (wireless) tag and a reader / writer, and the information preset in the tag is contactless by the reader / writer. The information can be read out or the tag can be contactlessly written with information by a reader / writer. Incidentally, the communication method between the tag and the reader / writer in such a system includes an electromagnetic coupling method, an electromagnetic induction method, a radio wave communication method, and the like. As described later, the present invention is closely related to the radio wave communication method. (For example, it is assumed that a microwave in the 2.4 GHz band is used).
[0003]
Here, referring to the RFID system according to the related art, FIG. 7 shows an outline of the system. As shown, the tag 1 itself is from a tag chip 11 and an antenna (half-wave dipole antenna or the like) 12, and the reader / writer 2 itself is from a host device (portable information terminal or the like) 21, a reader / writer module 23 and an antenna 22, respectively. FIG. 8 shows a more detailed configuration of the system.
[0004]
First, the operation of the tag 1 will be described. As shown in FIG. 8, a radio wave (frequency: f 0 ) Is received by the antenna 12 of the tag 1, the radio wave is rectified by the rectification / demodulation unit 112 in the tag chip 11 and converted into a DC power, so that the operation power of the entire tag chip 11 is obtained. ing. When the demodulation function is started to operate by the operation power supply, the received radio wave can be recognized as a read command for the tag 1, and based on the recognition result, the preset information (ID information) is transmitted from the memory unit 111. Is read out as transmission data, and this transmission data is subjected to modulation processing in the modulation section 113 prior to transmission to the reader / writer 2. The modulator 113 is specifically configured as a diode switch 1131. The diode switch 1131 is turned on / off according to the data state of the transmission data. That is, when the data state is “1”, the antenna 12 is turned on, the antenna 12 is terminated at the antenna impedance (for example, 50Ω), and the radio wave from the reader / writer 2 is absorbed. On the other hand, when the data state is “0”, the diode switch 1131 is set to the open state, and at the same time, the terminal of the antenna 12 is also set to the open state. At this time, the radio wave from the reader / writer 2 is reflected and returned to the reader / writer 2 which is the transmission source. Such a communication method is called a backscatter method. In any case, the internal pre-setting information of the tag 1 itself can be transmitted to the reader / writer 2 while the power is not supplied.
[0005]
On the other hand, the operation on the reader / writer 2 side will be described. When the pre-setting information is read from the tag 1, a read instruction is issued from the host device 21. Is notified to the communication control unit 233 via the host interface unit 231. In response to this notification, a read command is issued from the communication control unit 233 to the baseband processing unit 232, and the baseband processing unit 232 performs editing as transmission data and further performs filtering based on the read command. The transmission data is transferred to the ASK modulation section 234 as a baseband signal, and the local frequency (frequency: f 0 ) Is ASK-modulated (amplitude shift keying). Incidentally, the frequency setting for the frequency synthesizer 238 is performed by the communication control unit 233. Generally, the transmission frequency to the tag 1 is used by hopping in order to reduce the standing wave and the multipath of the signal from the tag 1. This hopping instruction is also issued from the communication control unit 233.
[0006]
As described above, in the ASK modulation section 234, the baseband signal from the baseband processing section 232 is ASK-modulated. The ASK-modulated baseband signal is transmitted from the antenna 22 to the tag 1 via the circulator 235. , Which are radiated as radio waves. The radiated radio wave is processed on the tag 1 side as described above. However, the signal reflected as a radio wave from the tag 1 by the back scatter method has the same frequency as that of the signal transmitted from the reader / writer 2. Will be the same. Therefore, if the signal from the tag 1 is received by the antenna 22 and is input to the mixer 236 to which the same local frequency as that at the time of transmission is input, a modulated signal on the tag 1 side appears from the mixer 236. Will be. The demodulation unit 237 demodulates the signal into data of “1” and “0”, and then transfers the data to the baseband processing unit 232. The baseband processing unit 232 also decodes the data. , Information on the memory unit 111 in the tag 1, that is, pre-set information is extracted. This pre-setting information is transferred to the host device 21 via the host interface unit 231 under the control of the communication control unit 233.
[0007]
As described above, the information preset in the memory unit 111 in the tag 1 can be read out by the reader / writer 2 in a non-contact manner. In addition to reading, desired information can be written into the memory unit 111 in the tag 1 by the reader / writer 2.
[0008]
However, in the general RFID system according to the related art, even if the distance between the tag and the reader / writer, that is, the communication distance is to be increased, the enlargement is limited. . This is because there is a limit to the power that can be transmitted from the reader / writer without a license (for example, about 200 mW), and the communication distance is at most 50 cm as the practical upper limit. In general, it is easy for a reader / writer to receive reflected radio waves from a tag, but there is a limit to how the tag side can react and operate with power supplied from the reader / writer. However, there has been a restriction on the extension of the communication distance.
[0009]
By the way, a technique for solving the above problems is described in Japanese Patent Application Laid-Open No. 2000-332664. In this case, a carrier signal from a carrier signal source provided separately from a reader / writer is used to provide a non-contact information medium. Is supplied with operating power continuously.
[0010]
[Problems to be solved by the invention]
However, in the case of Japanese Patent Application Laid-Open No. 2000-332664, it is possible to increase the communication distance between the non-contact information medium and the reader / writer and to simultaneously activate a plurality of non-contact information media. Since the system itself is dedicated to the system, the communication distance is easy and cannot be expanded economically. Further, when the reader / writer itself is used as a portable type, the carrier signal source itself is also used as a portable type, which is disadvantageous in transporting the system.
[0011]
SUMMARY OF THE INVENTION An object of the present invention is to provide a state in which a communication distance between a wireless tag and a read writer is ensured by ensuring that an operating power supply of the wireless tag itself is easily and economically secured from transmission radio waves other than from the read writer. Accordingly, an object of the present invention is to provide a wireless tag system capable of writing and reading data to and from a wireless tag.
[0012]
Another object of the present invention is to use the RFID tag system as a component so that the communication distance between the RFID tag and the RFID tag can be easily and economically increased, and data can be read / written from / to the RFID tag. Is to provide a reader / writer which is enabled.
[0013]
Still another object of the present invention is that the operating power of the wireless tag itself is easily and economically secured from transmitted radio waves other than from the reader / writer, thereby increasing the communication distance between the wireless tag and the reader / writer. It is an object of the present invention to provide a data writing / reading method capable of writing / reading data to / from a wireless tag while securing the data.
[0014]
[Means for Solving the Problems]
The wireless tag system according to the present invention is configured such that while a transmission radio wave from a general-purpose radio transmission source that is periodically in a radio transmission state for a predetermined period is received, the received transmission radio wave can be used as an operation power source to be in an operable state. And a reader / writer for writing data to the wireless tag or reading data from the wireless tag while a transmission radio wave from the general-purpose radio wave transmission source is being received. It was done.
[0015]
Therefore, the wireless tag periodically receives the transmission radio wave from the general-purpose radio wave transmission source that has been in the radio wave transmission state for the predetermined period, and thereby periodically enters the operable state for the predetermined period. However, the transmission radio wave is also received by the reader / writer, so that the period during which the wireless tag is in the operable state is known by the reader / writer. Therefore, during that period, data writing to the wireless tag or data reading from the wireless tag may be performed by the reader / writer.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
First, a system outline of an example of a wireless tag system according to an embodiment of the present invention is shown in FIG. 1, and a configuration of a more detailed example of the system is shown in FIG. As shown in FIGS. 1 and 2, the most significant difference from the RFID system according to the related art is that a general-purpose radio wave transmission source such as a radiotelephone which is widely and widely used at present is used as a radio wave transmission source. Specifically, use of the mobile phone 3 is considered. From this mobile phone 3, for example, an 800 MHz band, or 1. 5 GHz band radio wave (frequency: f 1 ) Is transmitted. In order to receive this radio wave, the tag 10 according to the present invention is newly provided with an antenna (half-wave dipole antenna or the like) 13 in addition to the existing functions. The radio wave received by the antenna 13 is rectified by the rectification unit 14, so that the operation power of the entire tag 10 is sufficiently ensured and is supplied to each block.
[0017]
On the other hand, as described later, the reader / writer 20 of the present invention is provided with an antenna 24 in addition to the existing functions in order to receive the radio waves from the mobile phone 3. By being processed by the carrier detecting unit 25, writing of data to the tag 10 or reading of data from the tag 10 is permitted while the radio wave is being received. Specifically, the carrier detection unit 25 detects transmission start / end timing from the received radio wave, and writes data to the tag 10 or synchronizes data from the tag 10 in synchronization with the transmission start timing. It is functioning so that reading can be performed.
[0018]
As described above, in the tag 10 according to the present invention, the antenna 13 and the rectifying unit 14 are newly provided in addition to the existing tag chip 11 and the antenna 12, and data is read from the tag 10 by the reader / writer 20. Prior to this, prior to this, it is necessary to call the service providing site of the present system from the mobile phone 3 near the tag 10 using a telephone number such as toll free. When the mobile phone 3 is connected to the service providing site via a telephone line, the mobile phone 3 transmits radio waves over a predetermined period (approximately 6.7 msec) periodically (20 msec) using, for example, a Japanese PDC (personal digital cellular) system. (Frequency: f 1 ) Are transmitted in bursts. The transmission power at that time is 0. It is about 8 W, which is a value considerably larger than that of the radio wave transmitted from the reader / writer 20. As described above, by receiving this radio wave at the tag 10, even if the communication distance between the tag and the reader / writer is increased, the operation power of the entire tag 10 is required and sufficient. is there.
[0019]
On the other hand, in the reader / writer 20, the transmission start / end timing of the radio wave is detected by the radio wave from the mobile phone 3 being received by the antenna 24 and processed by the carrier detection unit 25. In order to read data from the tag 10 in synchronization with the start timing, radio waves (frequency: f 0 ) Is transmitted to the tag 10 (the operation of the reader / writer 20 at this time will be described later). Radio wave (frequency: f) indicating a read command from reader / writer 20 0 ) Is received by the antenna 12 of the tag 10, the radio wave is rectified by the rectification / demodulation unit 112 in the tag chip 11, and is converted into a DC power, thereby obtaining the operating power of the entire tag chip 11. is there. Eventually, when the demodulation function is started to operate by the two operating power supplies, it is possible to recognize that the received radio wave is a read command for the tag 10, and based on the recognition result, the memory unit 111 outputs the preset setting information. The (ID information) is read out as transmission data, and this transmission data is subjected to modulation processing by the modulation section 113 prior to transmission to the reader / writer 20. The modulator 113 is specifically configured as a diode switch 1131, and the diode switch 1131 is turned on / off according to the data state of the transmission data. That is, when the data state is “1”, the antenna 12 is set to the ON state, the antenna 12 is terminated at the antenna impedance (for example, 50Ω), and the radio wave from the reader / writer 20 is absorbed. On the other hand, when the data state is “0”, the diode switch 1131 is set to the open state, and at the same time, the terminal of the antenna 12 is also set to the open state. At this time, the radio wave from the reader / writer 20 is reflected and returned to the reader / writer 20 that is the transmission source. Such a communication method is called a backscatter method. In any case, the internal pre-setting information of the tag 10 itself can be transmitted to the reader / writer 20 without power supply.
[0020]
Here, the configuration and operation on the reader / writer 20 side will be described. The reader / writer 20 of the present invention includes an antenna 24 and a carrier detection unit 25 in addition to the existing host device 21, antenna 22, and reader / writer module 23. It is configured as a newly provided state. When the preset information is read from the tag 10, a read instruction is issued from the host device 21, and the read instruction is sent to the communication control unit 233 via the host interface unit 231 in the reader / writer module 23. It is to be notified. In response to this notification, a read command is issued from the communication control unit 233 to the baseband processing unit 232, and the baseband processing unit 232 performs editing as transmission data and further performs filtering based on the read command. The transmission data is transferred to the ASK modulation section 234 as a baseband signal, and the local frequency (frequency: f 0 ) Is ASK-modulated (amplitude shift keying).
Here, it should be noted that since the transmission start timing of the radio wave from the mobile phone 3 is periodically notified from the carrier detection unit 25 to the communication control unit 233, the radio wave from the reader / writer 20 to the tag 10 is transmitted. Is controlled in such a manner that transmission of the data is started in synchronization with the transmission start timing.
[0021]
Incidentally, the frequency setting for the frequency synthesizer 238 is performed by the communication control unit 233. Generally, the transmission frequency to the tag 10 is used by hopping in order to reduce the standing wave and the multipath of the signal from the tag 10. This hopping instruction is also issued from the communication control unit 233.
[0022]
As described above, in the ASK modulation section 234, the baseband signal from the baseband processing section 232 is ASK-modulated. The ASK-modulated baseband signal is transmitted from the antenna 22 to the tag 10 via the circulator 235. , Which are radiated as radio waves. The radiated radio wave is processed as described above on the tag 10 side. However, the signal reflected as a radio wave from the tag 10 by the back scatter method has the same frequency as that of the signal transmitted from the reader / writer 20. Will be the same. Therefore, if the signal from the tag 10 is received by the antenna 22 and is input to the mixer 236 to which the same local frequency as that at the time of transmission is input, a modulated signal on the tag 10 side appears from the mixer 236. Will be. The demodulation unit 237 demodulates the signal into data of “1” and “0”, and then transfers the data to the baseband processing unit 232. The baseband processing unit 232 also decodes the data. , Information on the memory unit 111 in the tag 10, that is, pre-set information is extracted. This pre-setting information is transferred to the host device 21 via the host interface unit 231 under the control of the communication control unit 233.
[0023]
As described above, the information preset in the memory unit 111 in the tag 10 can be read out by the reader / writer 20 in a non-contact manner. In addition to reading, desired data can be written on the memory unit 111 in the tag 10 by the reader / writer 20.
[0024]
As can be understood from the above description, in the end, in the wireless tag system of the present invention, since a general-purpose mobile phone is used as a general-purpose radio wave transmission source, a special radio wave transmission source is unnecessary and the tag is not used. In addition to easily and economically obtaining the required operating power supply, the communication distance between the tag and the reader / writer can be increased. Specifically, when referring to the communication distance, in the case of a PDC system with a transmission power of 800 mW, it is expected that a communication distance of up to about 3 m can be ensured.
[0025]
FIG. 3 also shows a timing flow in an example of a reader / writer operation when a PDC mobile phone is assumed as a general-purpose radio wave transmission source. As shown in the figure, TDMA (Time Division Multiple Access) is adopted in the PDC system, and in the communication mode, the mobile phone sets about 6.times.20 msec. A burst transmission of 7 msec is performed. For 7 msec, the tag receives the radio wave from the mobile phone to obtain the internal operation power.
[0026]
On the other hand, about the reader / writer, about 6. When the radio wave from the mobile phone is received for 7 msec, the transmission start timing of the radio wave is detected, and at this transmission start timing, a signal is transmitted as a radio wave from the reader / writer to the tag. In the first half of the signal, a command to the tag is transmitted. Specifically, information such as an access type for reading or writing data and a data sequence number are transmitted in the first half of the signal. In the latter half of the signal, data transmission / reception is performed. In the case of reading data from the tag, in the tag, after receiving the command, the data read from the memory unit is transmitted to the reader / writer using the reflected radio wave, but in the case of writing data to the tag, After transmitting the command to the tag, the write data is continuously transmitted. In any case, the communication between the tag and the reader / writer is performed within the transmission time of the radio wave from the mobile phone, that is, about 6. Data is transmitted and received in a time-divided manner with the command so that the processing is completed within 7 msec. If data transmission / reception is not possible within the transmission time, the data may be transmitted / received over a plurality of burst transmission sections.
[0027]
FIG. 4 also shows a flow of an example of a reader / writer operation when data is read from a tag, which will be briefly described as follows.
[0028]
In other words, with the start of communication of the mobile phone, the mobile phone starts sending about 6. Radio waves (carriers) are transmitted in bursts for 7 msec, but the reader / writer detects the transmission start timing by receiving radio waves from the mobile phone (steps 41 and 42). . When the reader is activated for the first time after the detection of the transmission start timing of the carrier, a read command is transmitted to the tag (steps 43 and 44). In the tag, as a response to the read command, the preset information as data is read from the memory unit and transmitted to the reader / writer using the reflected radio wave (process 45).
[0029]
The above is the reader / writer operation flow when data is read from the tag. The operation flow when data is written to the tag is as follows. At 45, the write data may be transmitted to the tag.
[0030]
By the way, in the wireless tag system shown in FIG. 2, it is assumed that the mobile phone 3 is used as a general-purpose radio wave transmission source. However, depending on the case, the communication distance between the tag and the reader / writer can be short, and therefore, The mobile phone 3 may be unnecessary or not used. In order to cope with such a case, as shown in FIG. 5, a mode selection switch 25 newly provided in the reader / writer 20 may be manually operated from the outside as desired. For example, the mode selection switch 25 is normally set to the ON state, and data is transmitted and received to and from the tag 10 under the control of the communication control unit 233 based on the transmission start timing from the carrier detection unit 25. However, when it is set to the OFF state, the transmission start timing from the carrier detection unit 25 is ignored by the communication control unit 233. 10, data is transmitted and received.
[0031]
Lastly, an advertisement system as an application example of the wireless tag system of the present invention will be described as follows.
That is, as shown in FIG. 6, it is assumed that a tag 10 is attached to the advertisement paper 9 in advance, and a URL for obtaining detailed information on the advertisement is set in advance in the tag 10, and based on the URL, The detailed information is downloaded onto the mobile phone 3.
[0032]
More specifically, the user first makes a dial-up connection from the mobile phone 3 to the Internet 7 via the mobile communication network 6, but after the line connection, the mobile phone 3 is brought closer to the tag 10, and therefore, When the reader / writer 20 is activated while power is supplied to the tag 10 from the mobile phone 3, the URL is read from the tag 10 to the reader / writer 20. The URL is immediately transferred from the reader / writer 20 to the mobile phone 3 via the data communication cable 5, and the mobile phone 3 can be connected to the information providing server 8 based on the URL. It is one that can be downloaded above. At this time, since power is supplied from the mobile phone 3 to the tag 10, even if the distance between the tag 10 and the reader / writer 20 is about 3 m, the URL can be read from the tag 10. Is what it is.
[0033]
Incidentally, the following inventions (1) to (3) are also conceivable.
(1) An RFID (Radio Frequency Identification) tag includes an antenna for receiving a radio wave from a wireless communication different from a tag reader / writer for communicating with the tag, a radio wave for converting the radio wave into a power source, and an internal power supply. An RFID tag device comprising: a rectifying unit for supplying.
(2) A reader / writer function for reading / writing data from / to an RFID (Radio Frequency Identification) tag in one device, an antenna for receiving a radio wave from another wireless communication unit, and detecting a transmission start timing from the radio wave. An RFID tag reader / writer device, comprising: a carrier detecting unit; and reading and writing data from and to the RFID tag in synchronization with the transmission start timing.
(3) When reading / writing data from / to the RFID tag using the RFID tag according to claim 1 and the RFID tag / reader / writer device according to claim 2, another wireless communication unit is set in a transmission state, An RFID system, wherein radio waves are emitted from the other wireless communication means to the RFID tag.
[0034]
As described above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above embodiment at all, and various changes can be made without departing from the gist of the invention. It goes without saying that there is something.
[0035]
【The invention's effect】
As described above, the effects of the present invention include the following.
That is, the operating power of the wireless tag itself can be easily and economically secured from transmission radio waves other than from the reader / writer, so that the communication distance between the wireless tag and the reader / writer can be increased, and A wireless tag system capable of writing and reading data to and from a wireless tag.
[0036]
Further, a reader which is used as one component in a wireless tag system and which can write and read data to and from the wireless tag in a state where the communication distance between the wireless tag and the wireless tag is easily and economically secured is increased. A writer is provided.
[0037]
Furthermore, since the operating power supply of the wireless tag itself is easily and economically secured from transmission radio waves other than from the reader / writer, the communication distance between the wireless tag and the reader / writer can be further secured, and the data to the wireless tag can be secured. A data writing / reading method capable of performing writing / reading is provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing a system outline of an example of a wireless tag system according to an embodiment of the present invention.
FIG. 2 is a diagram showing a detailed configuration of an example of the system.
FIG. 3 is a diagram showing a timing flow in an example of a reader / writer operation when a PDC mobile phone is assumed as a general-purpose radio wave transmission source according to the present invention.
FIG. 4 is a diagram showing a flow in an example of a reader / writer operation (during data reading).
FIG. 5 is a diagram showing a detailed configuration of another example of the tag system of the present invention.
FIG. 6 is a diagram showing an advertisement system as an application example of the wireless tag system of the present invention.
FIG. 7 is a diagram showing a system outline of an RFID system according to a conventional technique.
FIG. 8 is a diagram showing a more detailed configuration of the system.
[Explanation of symbols]
3 mobile phone (general-purpose radio wave transmission source), 10 wireless tag, 11 tag chip, 12, 13, 22, 24 antenna, 20 reader / writer, 23 reader / writer module

Claims (5)

  1. While a transmission radio wave from a general-purpose radio transmission source that is periodically in a radio transmission state for a predetermined period is received, a wireless tag that is placed in an operable state with the received transmission radio wave as an operating power source,
    A wireless tag system comprising: a reader / writer for writing data to the wireless tag or reading data from the wireless tag while a transmission radio wave from the general-purpose radio wave transmission source is being received.
  2. The wireless tag system according to claim 1, wherein the general-purpose radio wave transmission source is a wireless telephone.
  3. A wireless tag that is in an operable state using the received transmission radio wave as an operating power source while receiving a transmission radio wave from a general-purpose radio transmission source periodically in a radio transmission state for a predetermined period. A data writer or a reader / writer for reading data from the wireless tag, in addition to existing means for writing / reading data to / from the wireless tag,
    Radio wave receiving means for receiving a transmission radio wave from a general-purpose radio wave transmission source;
    Carrier detection means for allowing the existing means to write data to a wireless tag or read data from the wireless tag while the transmission radio wave is being received by the radio wave receiving means. Reader writer.
  4. A data write / read method when data is written to a wireless tag or data is read from the wireless tag by a reader / writer,
    While transmitting a radio wave from a general-purpose radio wave transmission source that is periodically in a radio wave transmission state for a predetermined period to a wireless tag, and using the transmitted radio wave as an operating power source, the wireless tag is operable, A reader / writer receives the transmission radio wave, and while the transmission radio wave is being received, writes data to the wireless tag or reads data from the wireless tag. Read method.
  5. 5. The data writing / reading method according to claim 4, wherein the general-purpose radio wave transmission source is a wireless telephone.
JP2002209964A 2002-07-18 2002-07-18 Radio tag system, reader/writer and data writing/reading method Pending JP2004054515A (en)

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JP2005333169A (en) * 2004-05-18 2005-12-02 Sony Corp Wireless communication system and wireless communication device
WO2006021990A1 (en) * 2004-08-24 2006-03-02 Mitsubishi Denki Kabushiki Kaisha Data communication system, data communication apparatus, data communication method, and power transmission apparatus
WO2006075367A1 (en) * 2005-01-13 2006-07-20 Fujitsu Limited Information access system and method for accessing information in non-contact information storage device
JP2007135142A (en) * 2005-11-14 2007-05-31 Sony Corp Radio communication system and radio communication apparatus
WO2007099610A1 (en) * 2006-02-28 2007-09-07 Matsushita Electric Industrial Co., Ltd. Reader apparatus
JP2009130896A (en) * 2007-11-28 2009-06-11 Renesas Technology Corp Id tag
JP2009540752A (en) * 2006-06-15 2009-11-19 アルカテル−ルーセント ユーエスエー インコーポレーテッド Modulation of carrier radio signals by mobile terminals in wireless communication networks

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JP2005333169A (en) * 2004-05-18 2005-12-02 Sony Corp Wireless communication system and wireless communication device
WO2006021990A1 (en) * 2004-08-24 2006-03-02 Mitsubishi Denki Kabushiki Kaisha Data communication system, data communication apparatus, data communication method, and power transmission apparatus
WO2006075367A1 (en) * 2005-01-13 2006-07-20 Fujitsu Limited Information access system and method for accessing information in non-contact information storage device
US8223000B2 (en) 2005-01-13 2012-07-17 Fujitsu Limited Information access system for accessing information in contactless information storage device, and method therefor
JPWO2006075367A1 (en) * 2005-01-13 2008-06-12 富士通株式会社 Information access system and method for accessing information in a contactless information storage device
JP4519142B2 (en) * 2005-01-13 2010-08-04 富士通株式会社 Information access system and method for accessing information in a contactless information storage device
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JP4556848B2 (en) * 2005-11-14 2010-10-06 ソニー株式会社 Wireless communication system and wireless communication apparatus
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