CN116112888A - Ultrahigh frequency RFID temperature sensing system and temperature feedback method - Google Patents

Ultrahigh frequency RFID temperature sensing system and temperature feedback method Download PDF

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Publication number
CN116112888A
CN116112888A CN202211591616.1A CN202211591616A CN116112888A CN 116112888 A CN116112888 A CN 116112888A CN 202211591616 A CN202211591616 A CN 202211591616A CN 116112888 A CN116112888 A CN 116112888A
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frequency rfid
temperature
ultrahigh frequency
command
tag
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CN202211591616.1A
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李润泽
肖裕
颜盾
齐晓辉
张红丽
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Tianjin Kunpeng Information Technology Co ltd
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Tianjin Kunpeng Information Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
    • G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
    • G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The application relates to an ultrahigh frequency RFID temperature sensing system and a temperature feedback method in the technical field of sensors. The method is applied to temperature feedback of the GJB ultrahigh frequency RFID temperature sensing system, a new reader-writer instruction is not required to be customized in the temperature feedback method, and only the initial address of a pointer in a classification command frame is required to point to a preset specific address to start the ultrahigh frequency RFID tag to perform one-time temperature measurement, and after the temperature measurement is completed, the data is stored in the specific address in the storage area; after the high-frequency RFID reader-writer sends the Ack command, the temperature data is returned to the reader-writer along with UAC encoded data when the ultrahigh-frequency RFID tag receives the Ack command. The method has the advantages of simple realization and protocol compatibility, and can improve the compatibility of the ultrahigh frequency RFID temperature label with most of readers on the market.

Description

Ultrahigh frequency RFID temperature sensing system and temperature feedback method
Technical Field
The application relates to the technical field of sensors, in particular to an ultrahigh frequency RFID temperature sensing system and a temperature feedback method.
Background
With the wide application of RFID (Radio Frequency Identification radio frequency identification) technology in the field of internet of things, low-voltage and low-power-consumption temperature sensor technology integrated in a tag chip has received more attention. Such applications include temperature monitoring during cold chain logistics, warehouse ambient temperature monitoring, human body temperature measurement, temperature monitoring of important equipment in the power industry, and the like. The traditional passive temperature sensor temperature feedback method needs to customize a new temperature feedback instruction to acquire a temperature measurement result, so that a communication protocol with a tag chip cannot meet the standard regulation (GJB 7377.1), and the tag chip needs to customize a new temperature measurement instruction, so that the tag chip cannot be compatible with a reader-writer on the market.
Disclosure of Invention
Based on the above, it is necessary to provide an ultrahigh frequency RFID temperature sensing system and a temperature feedback method for solving the above-mentioned technical problems.
The temperature feedback method of the ultra-high frequency RFID temperature sensing system is applied to a temperature measurement system consisting of an ultra-high frequency RFID temperature tag and an ultra-high frequency RFID reader-writer which are designed by adopting GJB7377.1 standard, and comprises the following steps:
the ultrahigh frequency RFID reader-writer sends a SortTemp command to the ultrahigh frequency RFID temperature tag; the SortTemp command is obtained by pointing the initial address of the pointer in the SORT command to a preset specific address.
And the ultrahigh frequency RFID temperature tag starts one-time temperature measurement after receiving the SortTemp command, and stores temperature data to the preset specific address in the storage area after the temperature measurement is completed.
And after the ultrahigh frequency RFID temperature tag receives the ACK command sent by the ultrahigh frequency RFID reader, the ultrahigh frequency RFID temperature tag returns the temperature data to the ultrahigh frequency RFID reader along with UAC coding data.
In one embodiment, the ultra-high frequency RFID reader sends a SortTemp command to the ultra-high frequency RFID temperature tag, comprising:
and pointing the initial address of the pointer in the Sort command to 12h of the information area of the ultrahigh frequency RFID temperature label to obtain the SortTemp command.
And the ultrahigh frequency RFID reader-writer sends a SortTemp command to the ultrahigh frequency RFID temperature tag.
An ultra-high frequency RFID temperature sensing system comprises an ultra-high frequency RFID temperature tag and an ultra-high frequency RFID reader.
The ultrahigh frequency RFID reader-writer is communicated with the ultrahigh frequency RFID temperature tag in an RFID radio frequency mode, and the ultrahigh frequency RFID temperature tag is started to measure the temperature by adopting the temperature feedback method of any one of the ultrahigh frequency RFID temperature sensing systems, and temperature data is returned to the ultrahigh frequency RFID reader-writer.
The ultrahigh frequency RFID temperature sensing system and the temperature feedback method are applied to the temperature feedback of the GJB ultrahigh frequency RFID temperature sensing system, a new reader-writer instruction is not required to be customized in the temperature feedback method, and only the initial address of a pointer in a classification command frame is required to point to a preset specific address to start the ultrahigh frequency RFID tag to perform one-time temperature measurement, and the data is stored in the specific address in a storage area after the temperature measurement is completed; after the high-frequency RFID reader-writer sends an Ack command, when the ultrahigh-frequency RFID tag receives the Ack command, the temperature data is returned to the reader-writer along with UAC encoded data.
Drawings
FIG. 1 is a flow chart of a temperature feedback method of an ultra-high frequency RFID temperature sensing system according to an embodiment;
FIG. 2 is a link timing of communication between an UHF RFID temperature tag and an UHF RFID reader in another embodiment;
fig. 3 is an internal structural diagram of an ultra-high frequency RFID temperature tag in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, a temperature feedback method of an ultrahigh frequency RFID temperature sensing system is provided, and the method is applied to a temperature measurement system composed of an ultrahigh frequency RFID temperature tag and an ultrahigh frequency RFID reader-writer which are designed by adopting the GJB7377.1 standard, and the method comprises the following steps:
step 100: the ultrahigh frequency RFID reader-writer sends a SortTemp command to the ultrahigh frequency RFID temperature tag; the SortTemp command is obtained by pointing the starting address of the pointer in the Sort command to a preset specific address.
Specifically, the format of the classified temperature return command (SortTemp command) is completely consistent with that of the classified command (Sort command), so that the compatibility of the protocol is ensured; and pointing the starting address of the pointer in the Sort command to a preset specific address to obtain a SortTemp command, wherein the SortTemp command is used for classifying the ultrahigh frequency RFID temperature tag according to a criterion set in the command and starting one-time temperature measurement.
The Sort command can change the matching mark of the tag, and the frame format of the Sort command is shown in table 1.
Table 1 frame format of the start command
Figure BDA0003994765070000031
The definition of each data field in the frame format of the Sort command is as follows:
a) Command code: 10101010 b The code of the sort command.
b) A storage area: the logic storage area where the data for matching is located is designated, and four values are described as follows:
1)00 b : the matching is performed using the data in the tag information area.
2)01 b : the data in the encoded region is used for matching.
3)10 b : a security zone. If the storage area data field is 10 b The tag does not respond to the sort command.
4)11 b : the matching is performed using data in the user area. Tag without user area receives a storage area data field of 11 b If the length data field is not 0, then the tags do not match. The tag non-responsive storage area data field requiring security authentication is 11 b Is a classification command of (a).
If the logical storage area is locked as unreadable, the tag does not respond to the sort command.
For a tag supporting security authentication, if the read password is not 0, the tag non-responsive storage area data field is 00 b Or 11 b Is a classification command of (a).
c) Rules: the rule for indicating the label to set the matching mark is that four values are described as follows:
1)00 b : the matching tag sets the match flag to 1 b The unmatched tag sets the match flag to
0 b 。
2)01 b : the matched tag has its matched flag kept unchanged, and the unmatched tag sets the matched flag to 0 b 。
3)10 b : the matching tag sets the match flag to 1 b The matching flag of the unmatched tag remains unchanged.
4)11 b : the matching tag sets the match flag to 0 b The mismatched tag sets the match flag to 1 b 。
d) A pointer: the bit address pointing to the logical storage area where the match begins. If the pointer exceeds the access of the logical storage area, the tag does not match.
e) Length: indicating the bit length that needs to be matched. If the length is 0 and the data is storedDomain of not 10 b The tags match. If the matching length is outside the range of the logical storage area, the tags do not match.
f) Masking: data to be matched is added with 0 at the least significant bit of the mask if the length data field is odd b . The tag ignores the lowest bit of the mask when it receives a sort command with a matching length of an odd number.
g) And (3) checking: CRC-16 computation contains command codes, memory areas, rules, pointers, lengths, and mask data fields. If the verification contained in the command received by the tag is incorrect, the tag does not respond to the command. After receiving the classification command, the tag changes the matching mark according to the rule, and does not send a response data packet to the reader-writer.
Step 102: and after receiving the SortTemp command, the ultrahigh frequency RFID temperature tag starts one-time temperature measurement, and after the temperature measurement is finished, the temperature data is stored in a preset specific address in the storage area.
Step 104: and after the ultrahigh frequency RFID temperature tag receives the ACK command sent by the ultrahigh frequency RFID reader, the ultrahigh frequency RFID temperature tag returns temperature data to the ultrahigh frequency RFID reader along with UAC encoded data.
Specifically, an encoding acquisition command (ACK command) is used to acquire the data of the encoded region, and the frame format of the ACK command is shown in table 2.
Table 2 frame format of ACK command
Data field Command code Handle
Length of 2 bits 16 bits
Description of the invention 01 b handle
The definition of the individual data in the frame format of the ACK command is as follows:
a) Command code: 01 b The code of the get command is encoded.
b) Handle: and in the checking process, the ultrahigh frequency RFID temperature label transmits 11-bit random numbers and CRC-5, or receives a handle updating command and transmits the 11-bit random numbers and CRC-5.
After receiving the code acquisition command (ACK command), the ultrahigh frequency RFID temperature tag transmits a response packet to the ultrahigh frequency RFID reader, and the format of the response packet is shown in table 3.
Table 3 response packet format for ACK commands
Figure BDA0003994765070000051
The definition of the individual data fields in the response packet of the ACK order is:
a) Safety mode: until whether the safety authentication and the safety communication are needed, four values are as follows:
1)00 b : indicating that the tag does not support secure authentication and secure communications.
2)01 b : meaning that the tag supports secure authentication and secure communication, but does not require secure authentication and secure communication.
3)10 b : meaning that the tag supports secure authentication and secure communication, but only requires secure authentication and no secure communication.
4)11 b : meaning that the tag supports and requires secure authentication and secure communication.
b) Coding region: i.e. the data of the coding region, including the coding length, the coding head and the coding.
c) And (3) checking: the CRC-16 calculation includes a security module and a coding region data field.
The UAC encoded data is the response packet for the ACK order.
The link timing of communication between the uhf RFID temperature tag and the uhf RFID reader is shown in fig. 2. T in FIG. 2 2 The time for which the temperature sensor is acquiring the primary temperature. The Query command is a launch Query command.
In the temperature feedback method of the ultrahigh frequency RFID temperature sensing system, the method is applied to the temperature feedback of the GJB ultrahigh frequency RFID temperature sensing system, a new reader-writer instruction is not required to be customized in the temperature feedback method, and only the initial address of the pointer in the classification command frame is required to point to a preset specific address to start the ultrahigh frequency RFID tag to perform one-time temperature measurement, and the data is stored in the specific address in the storage area after the temperature measurement is completed; after the high-frequency RFID reader-writer sends an Ack command, when the ultrahigh-frequency RFID tag receives the Ack command, the temperature data is returned to the reader-writer along with UAC encoded data.
In one embodiment, step 100 comprises: directing the initial address of a pointer in the Sort command to 12h of an ultrahigh frequency RFID temperature label information area to obtain a SortTemp command; the ultrahigh frequency RFID reader-writer sends a SortTemp command to the ultrahigh frequency RFID temperature tag.
Specifically, the pointer in the Sort command frame points to 12h of the tag information area, and then one-time temperature measurement is started. This is the only difference between the sortamp command and the Sort command.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of other steps or sub-steps of other steps.
In one embodiment, an ultra-high frequency RFID temperature sensing system includes an ultra-high frequency RFID temperature tag and an ultra-high frequency RFID reader. The data communication protocol between the ultrahigh frequency RFID temperature tag and the ultrahigh frequency RFID reader-writer adopts the protocol in GJB 7377.1.
The ultrahigh frequency RFID reader-writer and the ultrahigh frequency RFID temperature label are communicated in an RFID radio frequency mode, and the ultrahigh frequency RFID temperature label is started to carry out temperature measurement by adopting the temperature feedback method of any one of the ultrahigh frequency RFID temperature sensing systems and temperature data is returned to the ultrahigh frequency RFID reader-writer.
In particular, as shown in fig. 3. The ultra-high frequency RFID temperature tag mainly comprises an antenna, a radio frequency front end, an analog front end, a digital baseband and an MTP memory, wherein the radio frequency front end comprises a demodulator, a modulator, a rectifier, an ESD protection device and a voltage limiting circuit, and the analog front end comprises a temperature sensor, a band gap reference, a clock, an LDO, a POR and other circuits.
Principle of operation of an ultrahigh frequency RFID temperature tag: when the antenna end receives radio frequency signals, the rectifier converts radio frequency energy into direct current voltage and stores the direct current voltage in the energy storage capacitor C1, the energy storage capacitor provides energy for the work of a subsequent chip, and the size of the energy storage capacitor determines the standby time of the chip.
From the formula i=c×v/T, c=i×t/V is obtained, where I is the standby operating current (including leakage current), V is the difference between the output voltage of the rectifier and the lowest voltage of the chip operating normally (where the lowest voltage is 1V), v=4v—1v=3v, e=q×t=c×v×t, assuming that the voltage limit of the rectifier is 4V 2 Wherein E is energy storage energy, Q is charge quantity, T 2 MTP time is written for accumulated temperature measurement. The total number of times of temperature measurement required is 168 times when the temperature measurement is required to be performed for seven days and once every hour. The energy required by one-time temperature measurement is 1nJ, and the energy required by writing temperature data into MTP is9nJ, the time required for one temperature measurement is 3ms, the time required for MTP writing is 3ms, and the total energy required for 168 temperature measurement is 1680nJ. Thus c=93.3 uF can be obtained. The calculation process does not consider the power consumption of chip leakage, and the value of the energy storage capacitor can be properly increased to ensure the standby time.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (3)

1. The temperature feedback method of the ultra-high frequency RFID temperature sensing system is characterized by being applied to a temperature measuring system consisting of an ultra-high frequency RFID temperature tag and an ultra-high frequency RFID reader-writer which are designed by adopting GJB7377.1 standard, and comprises the following steps:
the ultrahigh frequency RFID reader-writer sends a SortTemp command to the ultrahigh frequency RFID temperature tag; the SortTemp command is obtained by pointing the initial address of a pointer in the SORT command to a preset specific address;
the ultrahigh frequency RFID temperature tag starts one-time temperature measurement after receiving the SortTemp command, and stores temperature data to the preset specific address in a storage area after temperature measurement is completed;
and after the ultrahigh frequency RFID temperature tag receives the ACK command sent by the ultrahigh frequency RFID reader, the ultrahigh frequency RFID temperature tag returns the temperature data to the ultrahigh frequency RFID reader along with UAC coding data.
2. The method of claim 1, wherein the ultra-high frequency RFID reader sends a SortTemp command to an ultra-high frequency RFID temperature tag, comprising:
directing the initial address of a pointer in the Sort command to 12h of the ultrahigh frequency RFID temperature label information area to obtain a SortTemp command;
and the ultrahigh frequency RFID reader-writer sends a SortTemp command to the ultrahigh frequency RFID temperature tag.
3. An ultrahigh frequency RFID temperature sensing system is characterized by comprising an ultrahigh frequency RFID temperature tag and an ultrahigh frequency RFID reader;
the ultrahigh frequency RFID reader-writer is communicated with the ultrahigh frequency RFID temperature tag in an RFID radio frequency mode, and the ultrahigh frequency RFID temperature tag is started to measure the temperature by adopting the temperature feedback method of the ultrahigh frequency RFID temperature sensing system according to any one of claims 1-2, and temperature data is returned to the ultrahigh frequency RFID reader-writer.
CN202211591616.1A 2022-12-12 2022-12-12 Ultrahigh frequency RFID temperature sensing system and temperature feedback method Pending CN116112888A (en)

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