CN106508105B - For RF identification read write line to label information transferring method - Google Patents
For RF identification read write line to label information transferring methodInfo
- Publication number
- CN106508105B CN106508105B CN201010052674.8A CN201010052674A CN106508105B CN 106508105 B CN106508105 B CN 106508105B CN 201010052674 A CN201010052674 A CN 201010052674A CN 106508105 B CN106508105 B CN 106508105B
- Authority
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- China
- Prior art keywords
- label
- frame synchronization
- write line
- synchronization sequence
- read write
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Abstract
The present invention provides a kind of information transferring method of read write line for RF identification to label, including：Read write line launches continuous high level radio-frequency carrier；Label is activated after receiving the carrier wave, sends an identity code；After read write line receives the identity code, a frame synchronization sequence is produced and sends；Label is demodulated to which after receiving the frame synchronization sequence and is saved in memorizer, and returns a reception identifier；After read write line receives reception identifier, produced according to the instruction of background control system and coded baseband order, base band commands after the frame synchronization sequence that frame synchronization sequence generator is produced and coding are modulated and are sent, and wherein frame synchronization sequence is attached to before base band commands；Label demodulate the carrier signal containing data, by demodulation after frame synchronization sequence with preserve frame synchronization sequence be compared, if identical, set up synchronous communication therebetween, at the same label the base band commands are decoded and according to order execute next step operate.
Description
Technical field
It is more particularly to a kind of for radio frequency identification the present invention relates to a kind of radio frequency identification communication technology
Information transferring method of the read write line to label.
Background technology
Radio frequency identification (RFID) technology of the communications field is to carry out telecommunication using RF-wise
To reach the automatic identification technology of identification article.The technology and current digitlization Mobile business are adapted,
Automatic identification and remote real-time monitoring and management can be realized, is the popular skill in modern information technology
One of art.RFID label tag, which is arranged on, to be needed on the article of certification, and the label is sent by electromagnetic wave
Identity information on the article is to reception device, and RFID system can be followed the trail of by this working method
With the nearly all physical object of management.RFID is in industrial automation, business automation, communications and transportation
The various fields such as control management, anti-counterfeiting technology are with a wide range of applications.
General radio-frequency recognition system is made up of three parts, i.e., RFID label tag, read write line and after
Platform data management system.For simplicity, RFID label tag is hereinafter referred to as label.Read-write
Device sends the radiofrequency signal of certain frequency by antenna, when label enters the working region of antenna,
Label receives radiofrequency signal and is activated so as to obtain energy, is established between label and read write line
The information that itself is preserved is sent to read write line by communication, label, and the read write line docking collection of letters number is solved
Reconcile after decoding, by interface by the information data transmission of label to data management system, together
When can also perform the order that data management system is sent, perform different functions.
Whether RFID system includes external power supply according on label, can be divided into active label
RFID system and the class of RFID system two with passive label.Passive label itself does not have power supply, because
All energy needed for the work of this passive label must be obtained from the radio-frequency carrier that read write line is sent.
In contrast, active radio frequency label includes a battery, provides all or part of for the work of label
Energy.
In passive RFID system, the energy needed for labeling task is from the load sent from read write line
Extract, and worked in backscattering mode in ripple.The conventional RFID communication of current ultra-high frequency band
Agreement is IS0-18000-6B/C, and the coded system that its read write line to label is launched is respectively
Manchester is encoded and PIE codings.
Manchester codings can be supplied to the energy needed for labeling task, as fixed-length coding,
Efficiency of transmission is higher.But high level dutycycle is respectively 50%, energy in the sequence of symhols after coding
Utilization rate is very low.
PIE codings can also be supplied to the energy needed for labeling task, but be due to that data 0 are encoded
Length and length that data 1 are encoded it is different, the sampling of a higher frequency is needed during decoding
Circuit to carry out sample count to coded identification, is compared by count value with a threshold value, decoded
Data 0 and data 1, so due to digital baseband work frequency it is higher, will producing ratio it is larger
Power consumption, and there is the probability of error also than larger.In addition, non-isometric coding is also unfavorable for number
According to the raising of efficiency of transmission.
Therefore, the energy problem of label turns into a bottleneck of passive RFID technology performance boost.
The content of the invention
In order to solve the above problems, the invention provides a kind of read write line for radio frequency identification to mark
The information transferring method of label, comprises the following steps：
(1) read write line outwards launches the continuous high level radio-frequency carrier of certain length by antenna；
(2) after label receives the continuous high level radio-frequency carrier of read write line transmission, therefrom
Obtain energy and be activated, send an identity code to read write line；
(3) read write line is received after the identity code of label, and one frame synchronization sequence of generation simultaneously will
It is modulated on radio-frequency carrier, is then sent to the label；
(4) label is received is demodulated and is saved into memory to it after the frame synchronization sequence
In, while returning to one to read write line represents the reception identifier that frame synchronization sequence is finished receiving；
(5) read write line is received after reception identifier, and base is produced according to the instruction of background control system
Band is ordered and it encoded, the frame synchronization sequence and coding that frame synchronization sequence generator is produced
Base band commands afterwards are modulated on radio-frequency carrier, are sent by antenna, wherein frame synchronization sequence
It is attached to before base band commands, the wherein coding method is as described below：With a unit interval length
High level pulse represent code element " 1 ", represent code with the low level pulse of a unit interval length
First " 0 "；The binary number 0 in information source data is represented with two code elements " 10 "；When information source data
During the single binary number 1 of middle appearance, the binary number 1 is represented with two code elements " 11 "；Work as letter
When there is continuous binary number 1 in source data, represent odd bits with two code elements " 11 " two enter
Number 1 processed, the binary number 1 of even bit is represented with two code elements " 01 "；
(6) label is solved to receiving the carrier signal containing frame synchronization sequence and base band commands
Adjust, the frame synchronization sequence preserved in the frame synchronization sequence and memory after demodulation is compared, such as
Really two sequences are identical, then label sends one and represents that the synchronous synchronization set up sets up identifier to reading
Device is write, synchronous communication is set up therebetween, while label carries out decoding and root to the base band commands
Next step operation is performed according to order.
Further, if two sequences are differed, the label sends one and represents timing error
Timing error identifier is to read write line, and the read write line is received after the timing error identifier again
Produce a frame synchronization sequence and issue label, the step 4-6 is performed between the label and read write line
Until establishing synchronous communication.
Further, the continuous high level radio-frequency carrier does not include any data message, and its length is most
It is less 8 code periods.
Further, the frame synchronization sequence is " 1010V1 ", and wherein V represents to break rules.
The information transfer side provided in the read write line of RFID system into the link of label using the present invention
Method, compared with encoded using Manchester and PIE coding execution information transmission, can give label
More energy are provided, the bit error rate is lower.
In addition, by experimental verification, the efficiency of transmission of information transferring method of the invention with
Manchester codings are suitable, higher than PIE codings.
Brief description of the drawings：
Fig. 1 is the communication system schematic diagram of read write line for radio frequency identification and label；
Fig. 2 is the read write line and the structured flowchart of label of the communication means using the present invention；
Fig. 3 is the schematic diagram for the coding method that the present invention is provided；
Fig. 4 is the instance graph to data encoding according to coding method of the invention；
Fig. 5 is the stream according to the read write line for radio frequency identification of the invention to the communication means of label
Cheng Tu；
Fig. 6 is the high level duty of three kinds of coding methods using Manchester, PIE and the present invention
Compare schematic diagram；
Fig. 7 is contrasted using the bit error rate of three kinds of coding methods of Manchester, PIE and the present invention
Schematic diagram.
Embodiment：
The embodiment to the present invention is described in detail below with reference to the accompanying drawings.
Fig. 1 is read write line and the communication system schematic diagram of label for radio frequency identification, read write line to
Outer transmitting ACK modulated signals, when one or more labels are entered in the working range of read write line
The radiofrequency signal of read write line transmitting can be received, according to required for being returned to the order of reception
Data message；Read write line is transmitted to computer data management system after receiving the data message.
Fig. 2 is the read write line and the structured flowchart of label of the communication means using the present invention, such as figure institute
Show that read write line includes, with the antenna received with emission function, playing the modulatedemodulate of modulation and demodulation
Device is adjusted, for encoding kind of a codec for decoding, the frame synchronization sequence for producing frame synchronization sequence
Generator, and for producing the read-write controller of base band commands and other orders；Equally, label
Also there is antenna, modem, codec, the label also includes being used to carry radio frequency in addition
The voltage doubling rectifing circuit for the voltage that ripple is changed into required for labeling task, for preserving various data letters
The memory of breath, and for performing data read-write operation and producing the data control of various flag codes
Device.
The communication process of the read write line that the present invention is provided to label is：(1) read write line by antenna to
The continuous high level radio-frequency carrier of outer transmitting certain length, the carrier wave does not include any data message,
The length is at least 8 code periods；(2) label is received after the radio-frequency carrier, its inside
The voltage that voltage doubling rectifing circuit changes into the radio-frequency carrier required for labeling task, now label quilt
The binary system random number of one 0-15 is activated and produces, if the random number is 0, label is direct
The identity code for representing the tag identity is launched, if the random number is not 0, label
Automatically the operation that subtracts 1 is carried out to the random number, again by the identity code when random number is changed into 0
Launch；If the random number that two or more labels are produced is simultaneously 0, now send out
Raw collision, i.e. read write line receive two or more identity codes simultaneously, the read write line
The order for regenerating random number is sent to corresponding multiple labels without performing next step operation；
(3) read write line is received after the identity code of label, and one is produced by frame synchronization sequence generator
Frame synchronization sequence is simultaneously transferred to modem, is modulated on radio-frequency carrier, Ran Houfa
Label is given, wherein the frame synchronization sequence can use any of structure, as long as it can be real
Existing to set up synchronous communication between recipient and launch party, such as frame synchronization sequence generator can be with
Frame synchronization sequence " 1010V1 " is produced according to 6C agreements, wherein V represents to break rules；(4) label connects
Receive and it is demodulated and is saved into memory after the frame synchronization sequence, while to read-write
Device returns to one and represents the reception identifier that frame synchronization sequence is finished receiving；(5) read write line is received
Receive after identifier, base band commands produced according to the instruction of background control system and it is encoded,
Base band commands after frame synchronization sequence and coding that frame synchronization sequence generator is produced are modulated to radio frequency
On carrier wave, sent by antenna, wherein frame synchronization sequence is attached to before base band commands, its
In the coding method it is as described below：Code element is represented with the high level pulse of a unit interval length
" 1 ", code element " 0 " is represented with the low level pulse of a unit interval length；Use two code elements
" 10 " represent the binary number 0 in information source data；When occurring single binary number in information source data
When 1, the binary number 1 is represented with two code elements " 11 "；When occurring continuous two in information source data
System it is several 1 when, with two code elements " 11 " represent odd bits binary number 1, with two code elements " 01 "
Represent the binary number 1 of even bit；I.e. for continuous binary number 1, primary binary number 1
Represented with two code elements " 11 ", deputy binary number 1 is represented with two code elements " 01 ",
The binary number 1 of the 3rd represents that the binary number 1 of the 4th uses two with two code elements " 11 "
Individual code element " 01 " represents ... ..., by that analogy.In other words, it is long with a unit interval
The high level pulse of degree and the low level pulse of a unit interval length represent binary number 0, with two
The high level pulse of individual unit interval length represents the binary number 1 of odd bits, with a unit interval
The low level pulse of length and the high level pulse of a unit interval length represent that the two of even bit enters
Number 1 processed；(6) label is to receiving the radio-frequency carrier signal containing frame synchronization sequence and base band commands
It is demodulated, the frame synchronization sequence preserved in the frame synchronization sequence and memory after demodulation is compared
Compared with if two sequences are identical, label sends one and represents that mark is set up in the synchronous synchronization set up
Accord with to read write line, synchronous communication is thus set up therebetween, while label enters to the base band commands
Row decoding, obtains required base band commands content, and next step operation is performed according to the order；It is no
Then, label sends the timing error identifier of an expression timing error to read write line；(7) if
Read write line receives the timing error identifier, then re-executes the step 3-6 same until establishing
Step communication.
In above process, the base band commands and other various orders that read write line is launched all are by reading
What writing controller was produced, for example regenerate the order of random number；And the identification of label transmitting
Code and other various flag codes (i.e. various identifiers) are all produced, example by recording controller
Identifier is set up as synchronous.
Fig. 3 is the schematic diagram for the coding method that the present invention is provided, and its cryptoprinciple is：With a unit
The high level pulse of time span represents code element " 1 ", with the low level arteries and veins of a unit interval length
Punching represents code element " 0 "；The binary number 0 in information source data is represented with two code elements " 10 "；When
When having a single binary number 1 in information source data, the binary system is represented with two code elements " 11 "
Number 1；When there are multiple continuous binary numbers 1 in information source data, represented with two code elements " 11 "
The binary number 1 of odd bits, the binary number 1 of even bit is represented with two code elements " 01 "；I.e. pair
In multiple continuous binary numbers 1, primary binary number 1 is represented with two code elements " 11 ",
Deputy binary number 1 represents that the binary number 1 of the 3rd uses two with two code elements " 01 "
Individual code element " 11 " represents that the binary number 1 of the 4th is represented with two code elements " 01 " ... ...,
By that analogy.When in other words, with high level pulse and a unit for unit interval length
Between the low level pulse of length represent binary number 0, with the high level pulse of two unit interval length
The binary number 1 of odd bits is represented, with the low level pulse and a unit of unit interval length
The high level pulse of time span represents the binary number 1 of even bit.
The binary number 0 and 1 encoded according to the coding method of the present invention is as shown in figure 3, wherein
Dperiod is code-element period, and HLW is the high level pulse of unit time span, and it represents code element " 1 ",
LLW is the low level pulse of unit time span, and it represents code element " 0 ".Code element " 01 " represents low
Level is in preceding high level rear；" 10 " represent high level in preceding low level in rear, code element " 11 " table
Show two high level.
Fig. 4 is to be shown according to coding method of the invention in the instance graph to data encoding, figure to two
The coded graphics that binary data 0010100100000100 and 0110010111100101 is performed.
Fig. 5 is the stream according to the read write line for radio frequency identification of the invention to the communication means of label
Cheng Tu, the basic step of the communication process is as described below：
Step 1：Read write line outwards launches the continuous high level radio-frequency carrier of certain length by antenna,
The carrier wave does not include any data message.
Step 2：After label receives the continuous high level radio-frequency carrier of read write line transmission, from
It is middle to obtain energy and be activated, an identity code is sent to read write line.
Step 3：Read write line is received after the identity code of label, produces a frame synchronization sequence simultaneously
It is modulated on radio-frequency carrier, is then sent to the label.
Step 4：Label is received is demodulated and is saved into storage to it after the frame synchronization sequence
In device, while returning to a reception identifier to read write line.
Step 5：Read write line is received after reception identifier, is produced according to the instruction of background control system
Base band commands are simultaneously encoded to it, the frame synchronization sequence and volume that frame synchronization sequence generator is produced
Base band commands after code are modulated on radio-frequency carrier, are sent by antenna, wherein frame synchronization sequence
Row are attached to before base band commands；The specific coding method has been discussed in detail in upper part,
Here repeat no more.
Step 6：Label enters to receiving the radio-frequency carrier signal containing frame synchronization sequence and base band commands
Row demodulation, the frame synchronization sequence preserved in the frame synchronization sequence and memory after demodulation is compared,
If two sequences are identical, label sends a synchronization and sets up identifier to read write line, thus exists
Synchronous communication is set up between the two, while label is decoded to the base band commands, required for obtaining
Base band commands content, according to the order perform next step operation；Otherwise, label sends one together
Error identifier is walked to read write line.
Step 7：If read write line receives timing error identifier, the step 3-6 is re-executed
Until establishing synchronous communication.
In superincumbent description, read write line is introduced to the message transmitting procedure of label, is not had
Label is discussed in detail to the transmitting procedure of read write line, because any of transmission can be used
Method and coding method realize label to the information transfer of read write line, for example, label transmitting information
During to read write line, the consideration of the disposal ability in label itself is compiled usually using simple Miller
Code method carries out information transfer.
Fig. 6 is accounted for using the high level of three kinds of coding methods of Manchester, PIE and the present invention
Sky compares schematic diagram.
Energy size entrained by sequence of symhols after coding mainly determines by high level dutycycle,
High level dutycycle in sequence of symhols is bigger, then the energy that the sequence of symhols is carried is more,
More energy just can be provided to label.Therefore it may only be necessary to calculate the coding using the present invention
Method, Manchester methods and PIE methods data are encoded after sequence of symhols duty
Than, it is possible to analyze which kind of information transferring method can provide more energy to label.
Calculating behind for convenience, it is assumed that signal source sends binary data 0 and binary data 1
As the probability of (hereinafter simply referred to as data 0 and data 1) is, and send the general of continuous data 1
The probability of rate and independent data 1 is same, and the ratio that high and low level accounts for overall level is designated as P respectivelyhWith
Pl。
Easily acknowledge that according to the high level dutycycle of the Manchester sequence of symhols encoded and be
Ph=0.5.
PIE encoding models are set up, a list is connect with the high level of two continuous unit interval length
The low level of position time span represents data 1, i.e., represent data 1 with three code elements " 110 "；
Connect the low level of a unit interval length to represent data with the high level of a unit interval length
0, i.e., represent data 0 with two code elements " 10 ".Then according to the height of the PIE sequence of symhols encoded
Level dutycycle is：Ph=0.5*0.5+0.5*0.667=0.584.
And data are encoded with the coding method of the present invention, when sending independent data 1, because
The data 1 are represented with two code elements " 11 ", so the high level dutycycle of sequence of symhols is：
Ph=0.5*0.5+0.5*1=0.75
When sending multiple continuous data 1, because representing the number of odd bits with two code elements " 11 "
According to 1, the data 1 of even bit are represented with two code elements " 01 ", so the high level of sequence of symhols is accounted for
Empty ratio is：
Ph=0.5*0.5+0.5*1+0.5*0.5*0.5=0.625
High level dutycycle to above-mentioned two situations is averaged：
Ph=0.5*0.75+0.5*0.625=0.6875
As shown in fig. 6, the coding method with the present invention is encoded, the high level of sequence of symhols is accounted for
Sky can provide most energy than maximum to label.
In addition, by monte carlo method, the coding method of the present invention, Manchester are encoded
Method and PIE coding methods are applied to be analyzed in passive RFID system, in MATLAB softwares
Lower progress time-domain analysis emulation, compares their peak power, mean power size.
Table 1 gives the energy that three kinds of coding methods are provided
| Coded system | Mean power (dBm) | Peak power (dBm) |
| Manchester coding methods | 0.587 | 1.415 |
| PIE coding methods | 0.608 | 1.415 |
| The coding method of the present invention | 0.619 | 1.415 |
From table 1 it follows that the peak power of above-mentioned three kinds of coding methods is all, but this hair
The mean power of bright coding method is maximum, and PIE coding methods are taken second place, Manchester coding staffs
Method is minimum.Therefore, information transferring method of the invention can be supplied to the most energy of label.Carry
The energy of confession is higher, and the working range of read write line identification label is bigger, and read write line and label
Between the antijamming capability that communicates it is stronger.
Fig. 7 is the bit error rate pair of three kinds of coding methods using Manchester, PIE and the present invention
Compare schematic diagram.
The bit error rate is to weigh the index that data transmit accuracy at the appointed time.The bit error rate can be anti-
A kind of quality of coding method is reflected, its performance under different signal to noise ratios and channel condition is weighed.
By monte carlo method, by the coding method of the present invention, Manchester coding methods and
PIE coding methods are applied to be analyzed in passive RFID system, are missed under MATLAB softwares
Code performance is emulated, and compares their bit error rate size.
As shown in fig. 7, in communication process, the mistake communicated using the coding method of the present invention
Code check is minimum, using taking second place that Manchester coding methods are communicated, uses PIE coding staffs
The highest that method is communicated.
In a word, the read write line for radio frequency identification of the invention to label information transferring method not only
The energy supply problem needed for tab end normal work is improved, is increased between read write line and label
Distance is recognized, its bit error rate is also very low.
Although the present invention describes the information transferring method of the present invention in the way of specific embodiment,
It is that those skilled in the art both knows about, other communication steps can also be used to realize that read write line is arrived
The message transmitting procedure of label.Any communication of coding method comprising the present invention or information transfer side
Method will all be fallen within the scope and spirit of the invention.
Claims (4)
1. a kind of read write line for radio frequency identification is to the information transferring method of label, including：
(1) read write line outwards launches the continuous high level radio-frequency carrier of certain length by antenna；
(2) after label receives the continuous high level radio-frequency carrier of read write line transmission, therefrom
Obtain energy and be activated, send an identity code to read write line；
(3) read write line is received after the identity code of label, and one frame synchronization sequence of generation simultaneously will
It is modulated on radio-frequency carrier, is then sent to the label；
(4) label is received is demodulated and is saved into memory to it after the frame synchronization sequence
In, while returning to one to read write line represents the reception identifier that frame synchronization sequence is finished receiving；
(5) read write line is received after reception identifier, and base is produced according to the instruction of background control system
Band is ordered and it encoded, the frame synchronization sequence and coding that frame synchronization sequence generator is produced
Base band commands afterwards are modulated on radio-frequency carrier, are sent by antenna, wherein frame synchronization sequence
It is attached to before base band commands, the wherein coding method is as described below：With a unit interval length
High level pulse represent code element " 1 ", represent code with the low level pulse of a unit interval length
First " 0 "；The binary number 0 in information source data is represented with two code elements " 10 "；When information source data
During the single binary number 1 of middle appearance, the binary number 1 is represented with two code elements " 11 "；Work as letter
When there is continuous binary number 1 in source data, represent odd bits with two code elements " 11 " two enter
Number 1 processed, the binary number 1 of even bit is represented with two code elements " 01 "；
(6) label is solved to receiving the carrier signal containing frame synchronization sequence and base band commands
Adjust, the frame synchronization sequence preserved in the frame synchronization sequence and memory after demodulation is compared, such as
Really two sequences are identical, then label sends one and represents that the synchronous synchronization set up sets up identifier to reading
Device is write, synchronous communication is set up therebetween, while label carries out decoding and root to the base band commands
Next step operation is performed according to order.
2. method according to claim 1, if wherein two sequences are differed, the label is sent out
Send the timing error identifier of an expression timing error to read write line, the read write line receives described
A frame synchronization sequence is regenerated after timing error identifier and label is issued, the label and read-write
The step 4-6 is performed between device until establishing synchronous communication.
3. method according to claim 1, appoints wherein the continuous high level radio-frequency carrier does not include
What data message, its length is at least 8 code periods.
4. method according to claim 1, wherein the frame synchronization sequence is " 1010V1 ", its
Middle V represents to break rules.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110909554A (en) * | 2019-10-09 | 2020-03-24 | 威海北洋光电信息技术股份公司 | RFID intelligent bookshelf multi-row synchronous detection method and bookshelf |
| CN111800874A (en) * | 2020-05-28 | 2020-10-20 | 蓓安科仪（北京）技术有限公司 | Radio frequency identification method based on 5G communication |
| CN112307789A (en) * | 2020-10-29 | 2021-02-02 | 上海坤锐电子科技有限公司 | Electronic tag working method, electronic tag and electronic tag system |
| WO2024045887A1 (en) * | 2022-08-29 | 2024-03-07 | 广东识芯微电子科技有限公司 | Light-triggered rfid identification method and system |
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2010
- 2010-12-24 CN CN201010052674.8A patent/CN106508105B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110909554A (en) * | 2019-10-09 | 2020-03-24 | 威海北洋光电信息技术股份公司 | RFID intelligent bookshelf multi-row synchronous detection method and bookshelf |
| CN110909554B (en) * | 2019-10-09 | 2023-04-04 | 威海北洋光电信息技术股份公司 | RFID intelligent bookshelf multi-row synchronous detection method and bookshelf |
| CN111800874A (en) * | 2020-05-28 | 2020-10-20 | 蓓安科仪（北京）技术有限公司 | Radio frequency identification method based on 5G communication |
| CN111800874B (en) * | 2020-05-28 | 2022-05-06 | 蓓安科仪（北京）技术有限公司 | Radio frequency identification method based on 5G communication |
| CN112307789A (en) * | 2020-10-29 | 2021-02-02 | 上海坤锐电子科技有限公司 | Electronic tag working method, electronic tag and electronic tag system |
| CN112307789B (en) * | 2020-10-29 | 2024-02-23 | 上海坤锐电子科技有限公司 | Electronic tag working method, electronic tag and electronic tag system |
| WO2024045887A1 (en) * | 2022-08-29 | 2024-03-07 | 广东识芯微电子科技有限公司 | Light-triggered rfid identification method and system |
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