KR20110029003A - Reader of rfid - Google Patents

Abstract

PURPOSE: An RFID(Radio Frequency IDentification) reader is provided to clearly display a live-view image and tag-related information in a server device from a surveillance camera and an RFID reader. CONSTITUTION: A state control unit(41) performs a control operation according to a communication protocol with a server device, and stores tag-memory data received from plural RFID tags at a buffer memory. A transmission control unit(43) transfers the stored tag-memory data at a server device. The tag-memory data include user an EPC(Elecctro-Product Code) as OID(Object IDentification) with data following one of the protocol of ISO(International Standards Organization)-18000, TID(Tag IDentification), and reserved information.

Description

Reader of RFID {Reader of RFID}

The present invention relates to a RFID reader, and more particularly, to receive tag-memory data while communicating with a plurality of RFID tags, and to receive the received tag-memory data into a server device. It relates to the RFID reader (RFID) to transmit to.

In a typical RFID system, each RFID reader receives tag-memory data while communicating with a plurality of RFID tags, and stores the received tag-memory data in a server. Send to the device.

For example, if a surveillance camera and a RFID reader are installed in the doorway in a surveillance area, the server device may be configured from the live-view image from the surveillance camera and tags of the RFID. Display tag-related information of the.

However, in the case of the conventional RFID reader, all the repetitive tag-memory data from the RFID tag is transmitted to the server device while the RFID tag passes through the communication area.

Accordingly, the server device must process not only live-view image data from the surveillance camera, but also repetitive tag-memory data from the RFID reader, so that the display speed in the server device And poor image quality.

It is an object of the present invention to provide live-view images from surveillance cameras and tag-related information from RFID readers to enable fast and clear display on a server device. Is to provide a leader.

The RFID reader of the present invention is a RFID reader that receives tag-memory data from each of a plurality of RFID tags and transmits the tag-memory data to a server device. It includes a transmission control unit.

The state control unit stores tag-memory data received from each of the plurality of RFID tags in the buffer memory while performing overall control according to a communication protocol with the server device. .

The transmission control unit transmits the tag-memory data stored in the buffer memory to the server device.

According to the reader of the RFID of the present invention, tag-memory data received from each of the tags of the plurality of RFIDs may be transmitted to the server device only once or twice. .

Accordingly, since the amount of tag-memory data to be processed in the server device is greatly reduced, the server device is a live-view image from a surveillance camera and a tag from an RFID reader. -Display relevant information quickly and clearly.

FIG. 1 shows tag-memory data from tags 121a to 121n and 191a to 191n of a plurality of RFIDs, respectively, of RFID readers 111a to 111m according to an embodiment of the present invention. Shows a system of RFID (RFID) which receives and transmits to the server apparatus 3 via the communication network 2.

For example, when surveillance cameras (not shown) and RFID readers 111a to 111m are installed at the entrances and exits, the server device 3 is a live-view from the surveillance cameras. ) And tag-related information from tags 121a through 121n and 191a through 191n of the RFID.

Here, each of the RFID readers 111a through 111m may use tag-memory data received from each of the tags 121a through 121n and 191a through 191n of the RFIDs. For example, it transmits only to the first time and the last time to the server device 3.

Accordingly, since the amount of tag-memory data to be processed in the server device 3 is drastically reduced, the server device 3 is a live-view image from the surveillance camera and the reader of the RFID. Tag-related information from can be displayed quickly and clearly.

Related contents will be described in detail with reference to FIGS. 2 to 11.

Figure 2 shows the internal configuration of the reader of the RFID (RFID) according to an embodiment of the present invention.

2, a RFID reader according to an embodiment of the present invention receives tag-memory data from each of a plurality of RFID tags and transmits the tag-memory data to a server device. 251 to 256, 22 and 21, receivers 261 to 265q, 22 and 21, and a controller 24.

The transmitters 23, 251 to 256, 22, and 21 transmit the tag command data from the controller 24 to the tags of the RFID.

The receivers 23, 261 to 265q, 22, and 21 convert the received signals from the RFID tags into Q signals Sbq and I signals Sbi of different phases, and provide them to the controller 24. do.

The oscillator 23 included in the transmitter or the receiver generates an oscillation signal Mfc having a variable frequency for frequency hopping according to the control signal Scon from the controller 24.

The first and second analog-to-digital converters 265q and 265i included in the receiver convert the signals Saq and Sai from the receivers 261 to 264q into digital signals Scq and Sci to control the controller 24. ).

The control unit 24 transmits the tag command data Sdt and the power signal to the tag of the RFID while generating control signals Scon in the respective units. Further, the data Scc of the Q signal and the data Sc of the I signal from the receivers 261 to 265q are decoded and transmitted to the server apparatus (3 in FIG. 1).

Herein, the control unit 24 limits the tag-memory data received from each of the tags of the plurality of RFIDs to the server device 3 at this time, for example, first time and last time. send.

Accordingly, since the amount of tag-memory data to be processed in the server device 3 is drastically reduced, the server device 3 is a live-view image from the surveillance camera and the reader of the RFID. Tag-related information from can be displayed quickly and clearly.

Related contents will be described in detail with reference to FIGS. 3 to 11.

The digital-analog converter 251 included in the transmitter converts the tag command data Sdt from the controller 24 into an analog signal Sat. The base frequency filter 252 included in the transmitter passes only the signal of the base frequency in order to remove noise of the transmission signal Sat from the digital-analog converter 251.

The base frequency amplifier 253 included in the transmitter amplifies the transmission signal Sbt from the base frequency filter 252. In the up-mixer 254 included in the transmitting unit, the frequency of the transmitting signal Sbt from the base frequency amplifier 253 is present in accordance with the oscillating signal Mfc of the variable frequency from the oscillating unit 23. Adjust to the radio frequency to be used. That is, if the frequency of the transmission signal Sbt from the base frequency amplifier 253 is fb, and the frequency of the oscillation signal Mfc from the oscillator 23 is fm, it is determined from the up-mixer 254. The frequency ff of the transmission signal Sht is obtained by the following equation (1).

ff = fb + fm

In Equation 1, the frequency fm of the oscillation signal Mfc from the oscillator 23 is obtained by Equation 2 or Equation 3 below.

fm = fmp + fn

fm = fmp-fn

In Equations 2 and 3, fmp denotes the frequency of the oscillation signal Mfc in the previous period. fn indicates the interval frequency to be increased or decreased in accordance with the adaptive frequency hopping algorithm.

The radio frequency amplifier 255 included in the transmission unit primarily amplifies the power of the transmission signal Sht from the up-mixer 254. The power amplifier 256 included in the transmitter finally amplifies the power of the transmission signal Sht from the radio frequency amplifier 255. The transmission signal Sht from the power amplifier 256 is transmitted to the tag of the RFID through the circulator 22 and the transmission / reception antenna 21.

On the other hand, the balun BALUN 261 included in the receiver receives the received signals of the circulator 22 and has a first signal (Sh +) having a different phase (in this embodiment, having a phase difference of 180 ^o (π) from each other). And second signal (Sh−).

A 90 ^° phase shifter 266 included in the receiver shifts the phase of the oscillation signal Mfc from the oscillator 23 by 90 ^° .

The down-mixer 262q for the Q signal included in the receiver is configured to convert a first signal Sh + and a second signal Sh- from the balun BALUN 261 into a 90 ^° phase shifter 266. According to the oscillation signal from), it is converted into a base frequency Q + signal (Sq +) and Q- signal (Sq-).

The down mixer 262i for the I signal included in the receiver bases the first signal Sh + and the second signal Sh- from the balun BALUN 261 on the basis of the oscillation signal Mfc from the oscillator 23. Converts to I + signal (Si +) and I- signal (Si-) of frequency.

That is, if the frequencies of the first signal Sh + and the second signal Sh- from the balun BALUN 261 are ff and the frequency of the oscillation signal Mfc from the oscillator 23 is fm, the Q signal is used. The frequency fb of the Q receive signals Sq + and Sq- from the down-mixer 262q and the I receive signals Si + and Si- from the down-mixer 262i for the I signal are It is obtained by the following equation (4).

fb = ff-fm

In Equation 4, the frequency fm of the oscillation signal Mfc from the oscillator 23 is obtained by Equations 2 and 3 above.

The low pass filter 263q for the Q signal included in the receiver removes high frequency noise from the Q + signal Sq + and the Q− signal Sq− from the down-mixer 262q for the Q signal.

Similarly, the low pass filter 263i for the I signal removes high frequency noise from the I + signal Si + and the I- signal Si- from the down mixer 262i for the I signal.

The Q-signal differential amplifier 264q included in the receiver amplifies the difference signal between the Q + signal Sq + and the Q- signal Sq- from the low pass filter 263q for the Q signal to generate the Q signal Saq.

Similarly, the I-signal differential amplifier 264i amplifies the difference signal between the I + signal Si + and the I- signal Si- from the low pass filter 263i for the I signal to generate the I signal Sai.

3 illustrates an internal configuration of the controller 24 of FIG. 2.

2 and 3, the controller 24 includes a digital demodulator 245, a decoder 246, a communication controller 241, an encoder 242, and a digital modulator 243.

The digital demodulator 245 generates the integrated digital signal Dde according to the digital Q signal Scq and the digital I signal Sci from the analog-to-digital converters 265q and 265i. More specifically, according to the digital Q signal Scq and the digital I signal Sci from the analog-to-digital converters 265q and 265i, the positive integrated digital signal or the negative integrated digital signal is continuously generated. .

The decoder 246 decodes the integrated digital signal Dde continuously input from the digital demodulator 245 to continuously generate tag-memory data of binary data "1" or "0". In Fig. 3, reference numeral Err indicates a decoding error signal.

According to the signal Drc from the server apparatus, the communication control unit 241 performs overall control, controls the tag-memory data Dfin from the decoder 241, and communicates with the server apparatus, and controls the controlled tag-. The memory data Dsen is transmitted to the server device (3 in FIG. 1).

Here, the communication control unit 241 may limit the tag-memory data Dfin received from each of the tags of the plurality of RFIDs to this time, for example, the first time and the last time. (3) to send.

As a result, the amount of tag-memory data Dsen to be processed in the server device 3 is greatly reduced, so that the server device 3 provides a live-view image from the surveillance camera and an RFID. The tag-related information from the reader of the can be displayed quickly and clearly.

Related contents will be described in more detail with reference to FIGS. 4 to 11.

The encoder 242 encodes the tag command data Dct from the communication control unit 241.

The digital modulator 243 modulates the tag command data Dit from the encoder in a digital format, and inputs the resulting digital signal Sdt to the transmitters 251 to 256.

4 illustrates an internal configuration of the communication control unit 241 of FIG. 3. In FIG. 4, the same reference numerals as used in FIGS. 2 and 3 indicate the objects of the same function, and thus description thereof will be omitted.

Referring to FIG. 4, the communication control unit 241 of FIG. 3 includes a buffer memory 42, a state control unit 41, and a transmission control unit 43.

The state controller 41 limits the tag-memory data received from each of the tags of the plurality of RFIDs at one time while performing overall control according to the communication protocol with the server apparatus (3 in FIG. 1). It is stored in the buffer memory 42.

The transmission control section 43 transmits the tag-memory data stored in the buffer memory 42 to the server device 3 only for the first time and the last time for example.

As a result, the amount of tag-memory data Dsen to be processed in the server device 3 is greatly reduced, so that the server device 3 provides a live-view image from the surveillance camera and an RFID. The tag-related information from the reader of the can be displayed quickly and clearly.

Here, the tag-memory data may be any one of user data, tag information (TID: Tag IDntification) and reserved information according to the provisions of the International Standards Organization (ISO) -18000, and the international standardization organization. EPC (Electro-Product Code) as Object IDentification (OID) under the provisions of ISO (International Standards Organization) -18000.

The state controller 41 stores the EPC (Electro-Product Code) as the target information (OID) once in each of the tags of the RFIDs in the buffer memory 42.

In addition, in the data adding mode at the request of the server device, the state controller 41 stores the additional data which is at least one of user data, tag information (TID: Tag IDntification), and reserved information in the buffer memory 42. ). As is well known,

Here, the buffer memory 42 includes a transfer waiting area 421 and a transfer completion area 422.

The tag-memory data awaiting transmission is stored in the transmission waiting area 421. The transferred tag-memory data is stored in the transfer complete area 422.

FIG. 5 illustrates a data storage structure in the transmission wait area 421 of FIG. 4.

Referring to FIG. 5, for any address in the transmission standby area 421 of FIG. 4, an EPC (Electro-Product Code) as a target information (OID), a bank number indicating a type of additional data, and additional data are described. Stored.

FIG. 6 shows a data storage structure in the transfer complete area 422 of FIG.

Referring to FIG. 6, only an EPC (Electro-Product Code) as target information (OID) is stored for any address in the transfer completion area 422 of FIG. 4. As a result, the buffer memory 42 can be used more efficiently. An operation related to this will be described in detail with reference to FIGS. 8 to 11.

7 shows the types of tag-memory data according to the regulations of the International Standards Organization (ISO) -18000.

As described above, in accordance with the provisions of the International Standards Organization (ISO) -18000, the tag-memory data is stored in user data 71, tag information (TID, 72), target information (OID), and reserved. ) Include information.

Here, a bank number corresponding to the type of tag-memory data is set by the protocol with the host apparatus (3 in FIG. 1).

FIG. 8 illustrates a process in which the state controller 41 of FIG. 4 receives tag-memory data and stores the tag-memory data in the transmission waiting area 421 of the buffer memory 42.

2 to 4 and 8, the process of receiving the tag-memory data of FIG. 4 and storing the tag-memory data in the transmission waiting area 421 of the buffer memory 42 will be described below.

First, in order to receive the tag-memory data from the tag in the reception mode, the state controller 41 sets the frequency of the oscillator 23 and starts outputting the wireless power-signal (step S801).

Next, the state control unit 41 performs an anti-collision mode and receives an EPC (Electro-Product Code) as target information (OID) (step S802). This anti-collision mode will be described with reference to FIG. 9.

Next, the state control part 41 judges whether it is a data addition mode (step S803).

In the data adding mode, the state controller 41 performs steps S804 to S807.

In step S804, the state control unit 41 transmits the transmission unit 23, so that the output of the power-signal transmitted from the transmitters 23, 251 to 256, 22, 21 to the tags of the plurality of RFIDs is stopped. 251 to 256, 22, and 21).

In step S805, the state controller 41 checks and stores the switching state of the frequency channel of the oscillator 23.

In step S806, the state controller 41 sets the frequency of the oscillator 23.

In step S807, the state controller 41 ends if an end command has been generated, and otherwise executes step S801 and subsequent steps again.

On the other hand, if the data addition mode is not in the step S803, the state controller 41 performs steps S811 to S814.

In step S811, the state controller 41 determines whether the same EPC (Electro-Product Code) exists in the buffer memory 42.

If the same EPC (Electro-Product Code) exists in the buffer memory 42, the above steps S802 and subsequent steps are performed again.

If the same EPC (Electro-Product Code) is not present in the buffer memory 42, the steps S812 to S814 are continued.

In step S812, the state controller 41 stores the received EPC (Electro-Product Code) in the transfer waiting area 421 of the buffer memory 42.

In step S813, the state controller 41 receives additional data. That is, additional data, which is at least one of user data, tag ID (TID: Tag IDntification), and reserved information, is received.

In step S813, the state controller 41 stores the received additional data in the transfer waiting area 421 of the buffer memory 42.

When step S813 is performed, steps S802 and subsequent steps are performed again.

9 shows a detailed process of the impulse-prevention mode (step S802) of FIG.

Referring to FIG. 9, a detailed process of the impulse-prevention mode (step S802) of FIG. 8 will be described.

First, the state control unit 41 transmits the query command to the tags of the RFID, and then determines whether a random number of 16 bits from the tag of the RFID having received the query command is normally received. (Step S901).

If a random number of 16 bits from any of the tags of all RFIDs is not normally received, the state control section 41 transmits the adjusted query command (step S902). The adjusted query command refers to data of a result of adding or subtracting binary data '1' from the data of the query command transmitted in step S506 of FIG. 5.

If a random number of 16 bits from either tag is normally received, the control unit 24 transmits an approval command to the tag of the RFID (RFID) (step S903). Accordingly, the RFID tag transmits an EPC (Electro-Product Code) as target information (OID) to the reader.

Next, the state controller 41 determines whether the EPC as the target information OID has been normally received (step S904).

If the EPC as the target information (OID) has not been normally received, the state controller 41 transmits a maintenance command to the tag (step S906). Accordingly, the tag of the RFID maintains a transfer operation of tag-memory data. If the tag-memory data has not been normally received even after the maintenance command is transmitted, the above steps S902 and subsequent steps are performed again (step S907).

FIG. 10 illustrates a process in which the transmission control unit 43 of FIG. 4 uses data stored in the buffer memory 42. Referring to FIGS. 2 to 4 and 10, a process of using the data stored in the buffer memory 42 by the transmission control unit 43 of FIG. 4 will be described below.

In steps S101, S105, and S106, the transmission control unit 43 stores a tag data packet of tag-memory data stored in the transmission standby area 421 whenever a predetermined unit transmission time elapses. It transfers to the server apparatus (3 of FIG. 1).

In this case, the transmission control unit 43 determines whether there is an Electro-Product Code (EPC) in the transmission standby area 421 but not in the transmission completion area 422, and thus includes a tag data packet composed of corresponding EPC and additional data ( As the packet is transmitted to the server device 3, it is informed that the tag of the RFID corresponding to the corresponding EPC appears.

In step S107, the transmission control unit 43 deletes the transmitted tag data packet from the transmission waiting area 421.

In step S108, the transmission control unit 43 stores only the EPC (Electro-Product Code) as the target information OID among the deleted tag data packets in the transmission completion area 422.

In steps S101 to S103, whenever the predetermined unit transmission time has elapsed, the transmission control area 43 has the EPC (Electro-Product Code) stored in the transmission completion area 422 recently waiting for transmission. In step 421, it is determined that the tag of the RFID corresponding to the corresponding EPC disappears as the corresponding EPC is retransmitted to the server device 3.

The process of using the data stored in the buffer memory 42 by the transmission control unit 43 of FIG. 4 will be described in the following order.

First, the transmission control part 43 determines whether the predetermined unit transmission time has passed (step S101).

If the scheduled unit transfer time has elapsed, the transfer control unit 43 determines whether or not the EPC (Electro-Product Code) stored in the transfer completion area 422 is not present in the transfer waiting area 421. When the corresponding EPC is retransmitted to the server device 3, the tag of the RFID corresponding to the corresponding EPC disappears is notified (steps S102 and S103).

In addition, the transmission control unit 43 loads the EPC in the transmission waiting area 421 (step S104).

Next, the transmission control unit 43 determines whether the loaded EPC (Electro-Product Code) is not in the transmission completion area 422 (step S105), and if not, a tag data packet composed of the corresponding EPC and additional data. ) Is notified to the server device 3, indicating that the tag of the RFID corresponding to the corresponding EPC appears (step S106).

Next, the transmission control unit 43 deletes the transmitted tag data packet in the transmission waiting area 421 (step S107).

Next, the transmission control unit 43 stores only the EPC (Electro-Product Code) as the target information (OID) among the loaded EPCs, that is, the deleted tag data packets (step S108). .

All of these steps are performed repeatedly.

FIG. 11 shows the structure of a tag data packet transmitted to the server device (3 in FIG. 1) in step S106 of FIG.

4 and 11, the tag data packet transmitted by the transmission control unit 43 to the server device 3 includes the start information 111, the length information 112, the EPC 113, and the bank number 114. ), Additional data 115, data 116 of cyclic redundanct check (CRC) 16, and termination information 117.

The start information 111 indicates the start of the tag data packet.

The length information 112 informs the total length of the tag data packet.

The bank number 114 indicates the type of additional data. In the present embodiment, "11" indicates user data (71 in FIG. 7), "10" indicates tag information (TID, 72 in FIG. 7), "01" indicates no additional data, and "00" holds (Reserved) information (74 in FIG. 7) is indicated respectively.

The data of the Cyclic Redundanct Check (CRC) 16 is for the length information 112, the EPC 113, the bank number 114, and the additional data 115.

The termination information 117 indicates the end of the tag data packet.

As described above, according to the reader of the RFID according to the present invention, tag-memory data received from each of the tags of the plurality of RFIDs is limited to one or more times. Can be sent.

As a result, the amount of tag-memory data to be processed in the server device is greatly reduced, so that the server device can provide live-view images from surveillance cameras and tag-related information from RFID readers. Can be displayed quickly and clearly.

Possible use in general wireless communication systems.

FIG. 1 illustrates an RFID of a RFID reader that receives tag-memory data from a plurality of RFID tags and transmits the tag-memory data to a server device according to an embodiment of the present invention. A diagram showing the system.

2 is a block diagram illustrating an internal configuration of a reader of an RFID according to an embodiment of the present invention.

3 is a block diagram illustrating an internal configuration of a controller of FIG. 2.

4 is a block diagram illustrating an internal configuration of the communication controller of FIG. 3.

FIG. 5 is a diagram illustrating a data storage structure in the transmission standby region of FIG. 4.

FIG. 6 is a diagram illustrating a data storage structure in the transfer complete area of FIG. 4.

FIG. 7 is a diagram illustrating the types of tag-memory data according to the International Standards Organization (ISO) -18000.

8 is a flowchart illustrating a process in which the state controller of FIG. 4 receives tag-memory data and stores the tag-memory data in a buffer memory.

9 is a flowchart illustrating a detailed process of the impulse-proof mode of FIG. 8.

10 is a flowchart illustrating a process of using the data stored in the buffer memory by the transmission controller of FIG. 4.

FIG. 11 is a diagram illustrating a structure of a tag data packet transmitted to a server device in step S106 of FIG. 10.

<Explanation of symbols for the main parts of the drawings>

121a through 121n, 191a through 191n, tags of RFID,

111a to 111m ... leaders of RFID

2 ... network, 3 ... server unit,

21 transmit and receive antennas, 22 circulators,

23 ... oscillator, 24 ... controller,

251 digital to analog converter,

252, 263q, 263i ... filters for base frequency,

253, 264q, 264i ... base frequency amplifiers,

254 ... up-mixer, 255 ... radio frequency amplifier,

256 ... power amplifier, 261 ... BALUN,

262q, 262i ... down-mixers,

265q, 265i ... analog-to-digital converters,

241 communication control, 242 encoder,

243 digital demodulator, 245 digital demodulator,

246 decoder, 41 status control,

42 ... buffer memory, 421 ... send waiting area,

422 ... Transmission complete area, 43 ... Transmission control section.

Claims (11)

In a reader of an RFID that receives tag-memory data from each of a plurality of RFID tags and transmits the tag-memory data to a server device, Buffer memory; A state control unit configured to store tag-memory data received from each of the plurality of RFID tags once in the buffer memory while performing overall control according to a communication protocol with the server device; And RFID reader including a transfer control unit for transmitting the tag-memory data stored in the buffer memory to the server device. The method of claim 1, wherein the tag-memory data, Any one of user data, tag information (TID: Tag IDntification), and reserved information according to the provisions of the International Standards Organization (ISO) -18000; Leader of RFID, including Electro-Product Code (EPC) as Object IDentification (OID) as defined by International Standards Organization (ISO) -18000. The method of claim 2, wherein the state control unit, For each of the plurality of RFID tags, the EPC (Electro-Product Code) as the target information (OID) is limited to one time and stored in the buffer memory. In the data adding mode, the RFID reader stores at least one of the user data, tag information (TID: Tag IDntification), and reserved information in the buffer memory. The method of claim 3, wherein the buffer memory, A transmission waiting area in which tag-memory data awaiting transmission is stored; And RFID reader containing the transfer complete area where the transferred tag-memory data is stored. The method according to claim 4, wherein any one of the addresses in the transfer waiting area is A reader of an RFID (EPC) as the object information (OID), a bank number indicating a type of the additional data, and the additional data. The method of claim 5, wherein any one address in the transfer complete area is An RFID reader (RFID) in which only EPC (Electro-Product Code) as the target information (OID) is stored. The method of claim 6, wherein the transmission control unit, Each time a predetermined unit transmission time elapses, a tag data packet of tag-memory data stored in the transmission waiting area is transmitted to the server apparatus, Delete the transmitted tag data packet from the transmission waiting area, An RFID reader which stores only EPC (Electro-Product Code) as target information (OID) among deleted tag data packets in the transmission completion area. The method of claim 7, wherein the transmission control unit, Each time the unit transmission time elapses, it is determined whether an EPC (Electro-Product Code) recently stored in the transmission completion area is not in the transmission waiting area, and retransmits the corresponding EPC to the server device. The RFID reader that informs the disappearance of the RFID tag corresponding to the corresponding EPC. The method of claim 7, wherein the transmission control unit, Each time the unit transmission time elapses, it is determined whether there is an Electro-Product Code (EPC) in the transmission standby area but not in the transmission completion area, and a tag data packet composed of the corresponding EPC and additional data is determined. The RFID of the RFID notifying that the tag of the RFID corresponding to the corresponding EPC appears as transmitted to the server device. The tag data packet of claim 9, wherein the transmission control unit transmits the tag data packet to the server apparatus. Start information indicating the start of a tag data packet; Length information indicating a total length of a tag data packet; The EPC; A bank number indicating a type of the additional data; The additional data; Data of a cyclic redundanct check (CRC) 16 for the length information, the EPC, the bank number, and the additional data; And RFID reader containing termination information indicating the end of a tag data packet. The method of claim 1, Control unit; A receiving unit processing a received signal from each of the plurality of RFID tags and providing digital Q signals and digital I signals having different phases to the controller; And A transmitting unit which transmits transmission signals from the control unit to each of the tags of the plurality of RFIDs, And the control unit includes the buffer memory, the state control unit and the transmission control unit.

Images