Radio frequency identification system and method

Abstract

The present invention relates to the field of radio frequency identification technology, and in particular to a radio frequency identification system and method. The radio frequency identification system comprises a reader / writer, a master radio frequency tag and a slave radio frequency tag. The reader / writer is configured to send an inventory instruction; the master radio frequency tag is configured to send an identification of the master radio frequency tag to the reader / writer in response to the inventory instruction of the reader / writer, and the master radio frequency tag is also configured to send an activation signal to the slave radio frequency tag. The present invention obtains the identification of the master radio frequency tag by sending the inventory instruction by the reader / writer, does not need to know the identification of the master radio frequency tag in advance, can obtain the identification of the master radio frequency tag while starting the identification pairing process, and can quickly operate even if a new master radio frequency tag appears temporarily, thereby improving the efficiency of identification and matching.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency identification technology, and in particular to a radio frequency identification system and method. Background Art

[0002] Radio Frequency Identification (RFID) is a type of automatic identification technology. Its principle is to conduct non-contact data communication between the reader and the tag, and to read and write the tag using wireless radio frequency, so as to achieve the purpose of identifying the target and exchanging data. In view of the characteristics of RFID that uses radio waves to quickly exchange and store information without contact, people now often use RFID to match objects, usually through readers, master tags and slave tags. However, in the existing technology, before the reader takes inventory of the master tag, the reader needs to know the master tag's identification in advance, which increases the complexity of the identification operation and reduces the recognition efficiency. Summary of the invention

[0003] In view of the shortcomings of the prior art, the object of the present invention is to provide a radio frequency identification system and method, in which the reader does not need to know the identification of the main radio frequency tag in advance, thereby improving the efficiency of object identification and matching.

[0004] To achieve the above object, the present invention can be implemented through the following technical solutions:

[0005] A radio frequency identification system includes a reader / writer, a master radio frequency tag and a slave radio frequency tag.

[0006] The reader / writer is configured to send an inventory command;

[0007] The master radio frequency tag is configured to send the identification of the master radio frequency tag to the reader / writer in response to an inventory instruction of the reader / writer;

[0008] The reader / writer is also configured to receive and store the identification of the primary radio frequency tag;

[0009] The master radio frequency tag is also configured to send an activation signal to the slave radio frequency tag;

[0010] The slave RFID tag is configured to enter a waiting mode for receiving a custom read instruction in response to the activation signal;

[0011] The reader / writer is also configured to send a custom read instruction;

[0012] The slave RFID tag is further configured to receive the custom read instruction in a waiting mode for receiving a custom read instruction, and send an identification of the slave RFID tag to the reader / writer;

[0013] The reader / writer is further configured to receive and save the identification of the slave RFID tag, and determine the corresponding connection relationship between the master RFID tag and the slave RFID tag according to the received identifications of the master RFID tag and the slave RFID tag.

[0014] Furthermore, before the master radio frequency tag is configured to send an activation signal to the slave radio frequency tag, the method further includes:

[0015] The reader / writer is also configured to send a read instruction;

[0016] The master radio frequency tag is also configured to detect a read instruction.

[0017] Furthermore, the master radio frequency tag is a light source radio frequency tag, the slave radio frequency tag is a photosensitive radio frequency tag, and the master radio frequency tag and the slave radio frequency tag are connected to each other in a contactless optical manner.

[0018] Furthermore, the master radio frequency tag is an electric signal radio frequency tag, the slave radio frequency tag is an electric signal detection radio frequency tag, and the master radio frequency tag and the slave radio frequency tag are in contact electrical connection.

[0019] A radio frequency identification method, the method comprising:

[0020] The reader sends an inventory command;

[0021] The master radio frequency tag sends the identification of the master radio frequency tag to the reader / writer in response to the inventory command of the reader / writer;

[0022] The reader receives and stores the identification of the primary radio frequency tag;

[0023] The master radio frequency tag sends an activation signal to the slave radio frequency tag;

[0024] The slave radio frequency tag enters a waiting mode for receiving a custom read instruction in response to the activation signal;

[0025] The reader / writer sends a custom read instruction;

[0026] The slave RFID tag receives the custom read instruction in a waiting mode for receiving a custom instruction, and sends the identification of the slave RFID tag to the reader;

[0027] The reader / writer receives and stores the identification of the slave radio frequency tag, and determines the corresponding connection relationship between the master radio frequency tag and the slave radio frequency tag according to the received identifications of the master radio frequency tag and the slave radio frequency tag.

[0028] Furthermore, before the master radio frequency tag sends an activation signal to the slave radio frequency tag, it also includes:

[0029] The reader / writer sends a read instruction;

[0030] The master radio frequency tag detects a read instruction.

[0031] Furthermore, the reader / writer turns on the radio frequency electric field, and the master radio frequency tag and the slave radio frequency tag are powered on and initialized after entering the electric field. The master radio frequency tag enters the general RFID protocol mode by default, and the slave radio frequency tag is pre-configured by the reader / writer, and the characteristic value data is written to the specified address of the specified area of ​​the slave radio frequency tag. After the configuration is completed, the characteristic value data is saved when the power is turned off, and the characteristic value is checked each time the slave radio frequency tag is powered on to determine whether the slave radio frequency tag enters the activation signal detection mode.

[0032] Furthermore, the reader / writer turns on the radio frequency electric field before sending the inventory command, and the radio frequency electric field is maintained until the slave radio frequency tag sends the identification of the slave radio frequency tag to the reader / writer;

[0033] After the master radio frequency tag sends an activation signal to the slave radio frequency tag, the activation signal is kept output during the period when the radio frequency electric field is maintained;

[0034] The reader / writer repeatedly sends a custom read instruction;

[0035] During the period of receiving the custom instruction mode, the slave radio frequency tag repeatedly sends the identification of the slave radio frequency tag to the reader / writer when repeatedly receiving the custom read instruction.

[0036] Furthermore, the content of the custom read instruction sent by the reader / writer includes a frame header, an information field and a check code field.

[0037] Furthermore, the response content of the slave radio frequency tag in response to the custom read instruction sent by the reader / writer includes a frame header, information length, information field and a check code field.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] In the radio frequency identification system and method of the present invention, the reader does not need to know the identification of the main radio frequency tag in advance, and can obtain the identification of the main radio frequency tag while starting the tag identification pairing process, which simplifies the identification pairing process and speeds up the identification and matching. When the reader fails to obtain the tag identification of the slave radio frequency tag, it does not need to start a new identification process from the beginning. As long as the reader resends the custom read instruction to read the identification of the slave radio frequency tag, the identification process can be continued, which improves the efficiency of identification. In the reader of the present invention, within an inventory cycle, as long as the main radio frequency tag and the slave radio frequency tag are associated, there is only one main radio frequency tag and one slave radio frequency tag to respond, which greatly improves the accuracy of tag matching. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of a light source radio frequency tag and a photosensitive radio frequency tag;

[0041] Figure 2 It is a schematic diagram of the structure of an electric signal radio frequency tag and an electric signal detection radio frequency tag;

[0042] Figure 3 It is a structural schematic diagram of an implementation mode of the radio frequency identification system of the present invention;

[0043] Figure 4 is a schematic structural diagram of another embodiment of the radio frequency identification system of the present invention;

[0044] Figure 5 is a schematic structural diagram of another embodiment of the radio frequency identification system of the present invention;

[0045] Figure 6 is a method flow chart of an implementation method of embodiment 3 of the present invention;

[0046] Figure 7 is a method flow chart of another implementation method of embodiment 3 of the present invention;

[0047] Figure 8 is a method flow chart of another implementation method of embodiment 3 of the present invention;

[0048] Fig. 9 is a method flow chart of an implementation method of embodiment 4 of the present invention;

[0049] Fig.10 is a method flow chart of another implementation method of embodiment 4 of the present invention;

[0050] Fig.11 It is a method flow chart of another implementation method of Example 4 of the present invention. DETAILED DESCRIPTION

[0051] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. The terms such as "upper", "inner", "middle", "left", "right" and "one" cited in this specification are only for the convenience of description, and are not used to limit the scope of the present invention. The change or adjustment of their relative relationship shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0052] The existing tag recognition and pairing technology requires the reader to know and store the identification of the main RFID tag in advance before a series of recognition and pairing operations can be performed. If a new RFID tag appears temporarily and the identification of the RFID tag is unknown, the tag recognition and pairing process cannot be started, which increases the complexity of the recognition operation, makes the operation very inconvenient, and reduces the recognition efficiency. The RFID system and method of the present invention are designed to solve this problem. The reader does not need to know the identification of the main RFID tag in advance, which speeds up the speed and efficiency of recognition and matching. Embodiment 1

[0053] A radio frequency identification system includes a reader / writer, a master radio frequency tag and a slave radio frequency tag. Figure 3 As shown, the master RFID tag and the slave RFID tag correspond to each other one by one and are connected in a contactless or contact manner.

[0054] The reader is used to send instructions to tags (including master RFID tags and slave RFID tags) to read and write their data. Each master RFID tag and each slave RFID tag has a unique identifier, which can be a unique digital code. The reader turns on the RF electric field, and the master RFID tag and the slave RFID tag are powered on and initialized after entering the electric field. The master RFID tag enters the general RFID protocol mode by default, and the slave RFID tag needs to be pre-configured by the reader, that is, the characteristic value data is written to the specified address of the specified area of ​​the slave RFID tag. After the configuration is completed, the characteristic value data will be saved when the power is turned off. Each time the slave RFID tag is powered on, this characteristic value will be checked to determine whether the slave RFID tag enters the activation signal detection mode.

[0055] The reader is configured to send an inventory instruction. When the reader sends an inventory instruction to the main RFID tag, the main RFID tag that receives the inventory instruction sends the identification of the main RFID tag to the reader. The inventory instruction adopts a universal RFID protocol, which can quickly batch inventory the main RFID tags. The inventory instruction is an instruction set, including anti-collision instructions, wake-up instructions, and instructions for obtaining the identification of the main tag. Because only the main RFID tag enters the universal RFID protocol mode, the inventory instruction will only be responded to by the main RFID tag, and the slave RFID tag will not respond, which speeds up the response and improves the response accuracy. The present invention obtains the identification of the main RFID tag by sending an inventory instruction through the reader. It is not necessary to know and store the identification of the main RFID tag in advance. The identification of the main RFID tag can be obtained while the identification pairing process is started. Even if a new main RFID tag appears temporarily, it can be operated quickly to improve the efficiency of identification and matching.

[0056] After the main radio frequency tag sends the identification of the main radio frequency tag to the reader, the reader is configured to receive and store the identification of the main radio frequency tag.

[0057] The master RFID tag is configured to send an activation signal to the slave RFID tag. When the slave RFID tag is powered on, it will check the characteristic value data written at the specified address in the specified area to determine that the slave RFID tag has entered the activation signal detection mode. The slave RFID tag receives the activation signal sent by the master RFID tag. Because only the slave RFID tag enters the activation signal detection mode, at this time the slave RFID tag only responds to the activation signal and only the slave RFID tag associated with the master RFID tag will respond to the activation signal and enter the waiting mode for receiving the custom read instruction.

[0058] At this time, the reader sends a custom read instruction to all slave RFID tags, but because only the master RFID tag that responds to the reader's tag ID will activate the corresponding slave RFID tag, only this corresponding slave RFID tag detects the activation signal and enters the waiting mode for receiving the custom read instruction. The slave RFID tag receives the custom read instruction in the waiting mode for receiving the custom read instruction and sends the identification of the slave RFID tag to the reader. In other words, when the reader obtains the identification of the slave RFID tag, only the slave RFID tag responds and only the slave RFID tag paired with the master RFID tag responds. The master RFID tag does not participate in the process, and the signaling process is simpler and the reading speed is faster. The content of the custom read instruction sent by the reader includes the frame header, information field and check code field. Correspondingly, the response content of the slave RFID tag in response to the custom read instruction sent by the reader includes the frame header, information length, information field and check code field. The frame header uses the user-defined instruction field in the general RFID protocol, so it complies with the general RFID protocol and will not conflict with other instructions in the general RFID protocol. The information field is customized content, the check code field can verify the correctness of the entire instruction, and the information length can verify the integrity of the entire instruction. In this way, the reader can identify the RFID tag of this system, avoid confusion with tags of other systems, and improve the reading accuracy.

[0059] The reader receives and stores the identification of the slave RFID tag, and determines the corresponding connection relationship between the master RFID tag and the slave RFID tag according to the received identifications of the master RFID tag and the slave RFID tag, thereby achieving a matching operation of the two tags.

[0060] Repeat the above process to complete the pairing of all main RFID tags.

[0061] The reader turns on the RF electric field before sending the inventory command, and the RF electric field is maintained until the slave RF tag sends the slave RF tag's identification to the reader. After the master RF tag sends the activation signal to the slave RF tag, the activation signal output is maintained while the RF electric field is maintained. The reader repeatedly sends the custom read command, and the slave RF tag repeatedly sends the slave RF tag's identification to the reader when it repeatedly receives the custom read command during the custom command receiving mode. This ensures that as long as there is a slave RF tag associated with the master RF tag, the slave RF tag can be read by the reader, thereby sending the slave RF tag's identification to the reader, ensuring the success rate of identification and pairing.

[0062] The activation signal of the present application can be any perceptible signal, such as sound, light, and electricity, and is not limited to a perceptible signal requiring contact. In this embodiment, the activation signal can be an optical signal or an electrical signal.

[0063] When the master RFID tag is a light source RFID tag and the slave RFID tag is a photosensitive RFID tag, the activation signal is an optical signal, and the master RFID tag and the slave RFID tag are connected by non-contact optical method, such as Figure 1 , 4 As shown. The reader turns on the RF electric field, and the light source RF tag and the photosensitive RF tag enter the electric field and are powered on and initialized. The light source RF tag enters the general RFID protocol mode, and the photosensitive RF tag enters the photosensitive detection mode. The light source RF tag is a tag that supports the general RFID protocol. In this embodiment, the tag LED pin lights up the LED light after the light source RF tag receives the inventory instruction from the reader. The photosensitive RF tag is a special RF tag that supports the general RFID protocol tag. The photosensitive RF tag can be set to the photosensitive detection mode by pre-configuring the reader to write the characteristic value data to the specified address of the specified area. In this mode, when the photosensitive RF tag is in the RF electric field, it will detect the level signal of the photosensitive signal detection pin. If it detects a trigger signal level (activation signal), it enters the mode of receiving the custom read instruction. In this mode, the photosensitive RF tag can receive the custom read instruction sent by the reader through the RF antenna, thereby responding to the reader with the identification information of the photosensitive RF tag.

[0064] When the master RFID tag is an electrical signal RFID tag and the slave RFID tag is an electrical signal detection RFID tag, the master RFID tag and the slave RFID tag are in contact electrical connection, and the activation signal is an electrical signal, such as Figure 2 , 5As shown. The reader turns on the RF electric field, and the electric signal RF tag and the electric signal detection RF tag are powered on and initialized after entering the electric field. The electric signal RF tag enters the general RFID protocol mode, and the electric signal detection RF tag enters the electric signal detection mode. The electric signal RF tag is a tag that supports the general RFID protocol. In this embodiment, the electric signal RF tag provides a level signal on the tag's electric signal pin after receiving the inventory instruction of the reader. The electric signal detection RF tag is a dedicated RF tag that supports the general RFID protocol tag. The reader can pre-configure the writing of characteristic value data to the specified address of the specified area, and the electric signal detection RF tag can be set to the electric signal detection mode. In this mode, when the electric signal detection RF tag is in the RF electric field, it will detect the level signal of the electric signal detection pin. If it detects a trigger signal level (activation signal), it enters the mode of receiving a custom read instruction. In this mode, the electric signal detection RF tag can receive the custom read instruction sent by the reader through the RF antenna, thereby responding to the reader with the identification information of the electric signal detection RF tag. Embodiment 2

[0065] A radio frequency identification system includes a reader / writer, a master radio frequency tag and a slave radio frequency tag, such as Figure 3 As shown, the master RFID tag and the slave RFID tag correspond to each other one by one and are connected in a contactless or contact manner.

[0066] The reader is used to send instructions to tags (including master RFID tags and slave RFID tags) to read and write their data. Each master RFID tag and each slave RFID tag has a unique identifier, which can be a unique digital code. The reader turns on the RF electric field, and the master RFID tag and the slave RFID tag are powered on and initialized after entering the electric field. The master RFID tag enters the general RFID protocol mode by default, and the slave RFID tag needs to be pre-configured by the reader, that is, the characteristic value data is written to the specified address of the specified area of ​​the slave RFID tag. After the configuration is completed, the characteristic value data will be saved when the power is turned off. Each time the slave RFID tag is powered on, this characteristic value will be checked to determine whether the slave RFID tag enters the activation signal detection mode.

[0067] The reader is configured to send an inventory instruction. When the reader sends an inventory instruction to the main radio frequency tag, the main radio frequency tag that receives the inventory instruction sends the identification of the main radio frequency tag to the reader. The inventory instruction adopts a universal RFID protocol, which can quickly batch inventory the main radio frequency tags. The inventory instruction is an instruction set, including anti-collision instructions, wake-up instructions, and instructions for obtaining the identification of the main tag. Because only the main radio frequency tag enters the universal RFID protocol mode, the inventory instruction will only be responded to by the main radio frequency tag, and the slave radio frequency tag will not respond, thereby speeding up the response speed and improving the response accuracy. The present invention obtains the identification of the main radio frequency tag by sending an inventory instruction through the reader. It is not necessary to know and store the identification of the main radio frequency tag in advance. The identification of the main radio frequency tag can be obtained while the identification pairing process is started. Even if a new main radio frequency tag temporarily appears, it can be operated quickly to improve the efficiency of identification and matching.

[0068] After the main radio frequency tag sends the identification of the main radio frequency tag to the reader, the reader is configured to receive and store the identification of the main radio frequency tag.

[0069] The reader is configured to send a read instruction to the master RFID tag, and the master RFID tag sends an activation signal to the slave RFID tag after detecting the read instruction. By sending a read instruction to the master RFID tag, and then sending an activation signal to the slave RFID tag after the master RFID tag detects the read instruction, the timing of the master RFID tag sending the activation signal can be controlled. In this way, after the master RFID tag responds to the tag identification to the reader, the reader continues to send an electric field to the master RFID tag to charge the master RFID tag, ensuring that the energy of the master RFID tag is sufficient to stimulate the activation signal. For example, if some devices that require relatively large driving energy are used to send an activation signal, it will take a longer time to charge before the activation signal is sent. Therefore, adding this step can control the timing of the activation signal. The read instruction includes a specified read area and a specified read address. The master RFID tag will only send an activation signal to the slave RFID tag after detecting the read instruction (that is, reading the specified address of the specified area).

[0070] When the slave RFID tag is powered on, it will check the characteristic value data written at the specified address in the specified area to determine whether the slave RFID tag has entered the activation signal detection mode. The slave RFID tag receives the activation signal sent by the master RFID tag. Because only the slave RFID tag enters the activation signal detection mode, at this time the slave RFID tag only responds to the activation signal and only the slave RFID tag associated with the master RFID tag will respond to the activation signal and enter the waiting mode for receiving the custom read instruction.

[0071] At this time, the reader sends a custom read instruction to all slave RFID tags, but because only the master RFID tag that responds to the reader's tag ID will activate the corresponding slave RFID tag, only this corresponding slave RFID tag detects the activation signal and enters the waiting mode for receiving the custom read instruction. The slave RFID tag receives the custom read instruction in the waiting mode for receiving the custom read instruction and sends the identification of the slave RFID tag to the reader. In other words, when the reader obtains the identification of the slave RFID tag, only the slave RFID tag responds and only the slave RFID tag paired with the master RFID tag responds. The master RFID tag does not participate in the process, and the signaling process is simpler and the reading speed is faster. The content of the custom read instruction sent by the reader includes the frame header, information field and check code field. Correspondingly, the response content of the slave RFID tag in response to the custom read instruction sent by the reader includes the frame header, information length, information field and check code field. The frame header uses the user-defined instruction field in the general RFID protocol, so it complies with the general RFID protocol and will not conflict with other instructions in the general RFID. The information field is customized content, the check code field can verify the correctness of the entire instruction, and the information length can verify the integrity of the entire instruction. In this way, the reader can identify the RFID tag of this system, avoid confusion with tags of other systems, and improve the reading accuracy.

[0072] The reader receives and stores the identification of the slave RFID tag, and determines the corresponding connection relationship between the master RFID tag and the slave RFID tag according to the received identifications of the master RFID tag and the slave RFID tag, thereby achieving a matching operation of the two tags.

[0073] Repeat the above process to complete the pairing of all main RFID tags.

[0074] The reader turns on the RF electric field before sending the inventory command, and the RF electric field is maintained until the slave RF tag sends the slave RF tag's identification to the reader. After the master RF tag sends the activation signal to the slave RF tag, the activation signal output is maintained while the RF electric field is maintained. The reader repeatedly sends the custom read command, and the slave RF tag repeatedly sends the slave RF tag's identification to the reader when it repeatedly receives the custom read command during the custom command receiving mode. This ensures that as long as there is a slave RF tag associated with the master RF tag, the slave RF tag can be read by the reader, thereby sending the slave RF tag's identification to the reader, ensuring the success rate of identification and pairing.

[0075] The activation signal of the present application can be any perceptible signal, such as sound, light, and electricity, and is not limited to a perceptible signal requiring contact. In this embodiment, the activation signal can be an optical signal or an electrical signal.

[0076] When the master RFID tag is a light source RFID tag and the slave RFID tag is a photosensitive RFID tag, the activation signal is an optical signal, and the master RFID tag and the slave RFID tag are connected by non-contact optical method, such as Figure 1 , 4 As shown. The reader turns on the RF electric field, and the light source RF tag and the photosensitive RF tag enter the electric field and are powered on and initialized. The light source RF tag enters the general RFID protocol mode, and the photosensitive RF tag enters the photosensitive detection mode. The light source RF tag is a tag that supports the general RFID protocol. In this embodiment, after the light source RF tag receives the inventory instruction of the reader, the reader reads the specified address data of the specified area of ​​the light source RF tag, so that the LED light can be lit from the LED pin of the light source RF tag. The photosensitive RF tag is a special RF tag that supports the general RFID protocol tag. The reader pre-configures the writing of characteristic value data to the specified address of the specified area, and the photosensitive RF tag can be set to the photosensitive detection mode. In this mode, when the photosensitive RF tag is in the RF electric field, it will detect the level signal of the photosensitive signal detection pin. If it detects a trigger signal level (activation signal), it enters the mode of receiving the custom read instruction. In this mode, the photosensitive RF tag can receive the custom read instruction sent by the reader through the RF antenna, thereby responding to the reader with the identification information of the photosensitive RF tag.

[0077] When the master RFID tag is an electrical signal RFID tag and the slave RFID tag is an electrical signal detection RFID tag, the master RFID tag and the slave RFID tag are in contact electrical connection, and the activation signal is an electrical signal, such as Figure 2 , 5 As shown. The reader turns on the RF electric field, and the electric signal RF tag and the electric signal detection RF tag enter the electric field and are powered on and initialized. The electric signal RF tag enters the general RFID protocol mode, and the electric signal detection RF tag enters the electric signal detection mode. The electric signal RF tag is a tag that supports the general RFID protocol. In this embodiment, after the electric signal RF tag receives the inventory instruction of the reader, the reader reads the specified address data of the specified area of ​​the electric signal RF tag, so that a level signal can be provided from the electric signal pin of the electric signal RF tag. The electric signal detection RF tag is a dedicated RF tag that supports the general RFID protocol tag. The reader is pre-configured to write the characteristic value data to the specified address of the specified area, and the electric signal detection RF tag can be set to the electric signal detection mode. In this mode, when the electric signal detection RF tag is in the RF electric field, it will detect the level signal of the electric signal detection pin. If it detects a trigger signal level (activation signal), it enters the mode of receiving the custom read instruction. In this mode, the electric signal detection RF tag can receive the custom read instruction sent by the reader through the RF antenna, so as to respond to the reader with the identification information of the electric signal detection RF tag. Embodiment 3

[0078] A radio frequency identification method is applied to the radio frequency identification system provided in the first embodiment, such as Figure 6-8 As shown, the radio frequency identification method includes:

[0079] S1. The reader turns on the radio frequency electric field. After the master radio frequency tag and the slave radio frequency tag enter the electric field, they are powered on and initialized. The master radio frequency tag enters the general RFID protocol mode by default. The slave radio frequency tag needs to be pre-configured by the reader, that is, the characteristic value data is written to the specified address of the specified area of ​​the slave radio frequency tag. After the configuration is completed, the characteristic value data will be saved when the power is turned off. Each time the slave radio frequency tag is powered on, this characteristic value will be checked to determine whether the slave radio frequency tag enters the activation signal detection mode. The reader sends an inventory instruction. The inventory instruction adopts the general RFID protocol, which can quickly batch inventory the master radio frequency tags. The inventory instruction is an instruction set, including anti-collision instructions, wake-up instructions, and instructions for obtaining the master tag identification. The present invention obtains the identification of the master radio frequency tag by sending an inventory instruction through the reader / writer. It is not necessary to know and store the identification of the master radio frequency tag in advance. The identification of the master radio frequency tag can be obtained while starting the identification and pairing process. Even if a new master radio frequency tag appears temporarily, it can be operated quickly to improve the efficiency of identification and matching.

[0080] S2, the master RFID tag receives the inventory command from the reader, responds to the inventory command from the reader, sends the master RFID tag's identification to the reader, and sends an activation signal to the slave RFID tag. Because only the master RFID tag enters the universal RFID protocol mode, the inventory command will only be responded to by the master RFID tag, and the slave RFID tag will not respond, which speeds up the response and improves the response accuracy.

[0081] S3. The reader receives and saves the identification of the master RFID tag. Each master RFID tag has a unique identification, which can be a unique digital code. If the reader does not receive the identification of the master RFID tag within an inventory cycle, there may be a situation where the inventory fails or there is no master RFID tag, and the inventory instruction can continue to be sent.

[0082] S4. When the slave RFID tag is powered on, it will check the characteristic value data written in the specified address of the specified area to determine that the slave RFID tag has entered the activation signal detection mode. When the slave RFID tag receives the activation information sent by the master RFID tag, it responds to the activation signal. Because only the slave RFID tag enters the activation signal detection mode, at this time the slave RFID tag only responds to the activation signal and only the slave RFID tag associated with the master RFID tag will respond to the activation signal and enter the waiting mode for receiving the custom read instruction.

[0083] S5. The reader sends a custom read instruction to all slave RFID tags. The custom read instruction includes a frame header, an information field, and a check code field.

[0084] S6. At this time, only the master RFID tag that responds to the tag identification of the reader will activate the slave RFID tag corresponding to it. Therefore, only this corresponding slave RFID tag detects the activation signal and enters the waiting mode for receiving the custom read instruction. The slave RFID tag receives the custom read instruction in the waiting mode for receiving the custom read instruction and sends the identification of the slave RFID tag to the reader. In other words, when the reader obtains the identification of the slave RFID tag, only the slave RFID tag responds and only the slave RFID tag paired with the master RFID tag responds. The master RFID tag does not participate in the process, the signaling process is simpler, and the reading speed is faster. Each slave RFID tag has a unique identification, which can be a string of unique digital codes. The response content of the slave RFID tag in response to the custom read instruction sent by the reader includes a frame header, information length, information field, and a checksum field. The frame header uses the user-defined instruction field in the general RFID protocol, so it complies with the general RFID protocol and will not conflict with other instructions in the general RFID. The information field is customized content, the check code field can verify the correctness of the entire instruction, and the information length can verify the integrity of the entire instruction. In this way, the reader can identify the RFID tag of this system, avoid confusion with tags of other systems, and improve the reading accuracy.

[0085] S7, the reader receives and saves the identification of the slave RFID tag, and determines the corresponding connection relationship between the master RFID tag and the slave RFID tag according to the received identification of the master RFID tag and the slave RFID tag. At this time, the reader completes the identification reading of the master RFID tag and the slave RFID tag, thereby realizing the matching operation of the two tags.

[0086] Repeat the above steps to complete the pairing of all main RFID tags.

[0087] The reader turns on the RF electric field before sending the inventory command, and the RF electric field is maintained until the slave RF tag sends the slave RF tag's identification to the reader. After the master RF tag sends the activation signal to the slave RF tag, the activation signal is output while the RF electric field is maintained. The reader repeatedly sends the custom read command, and the slave RF tag repeatedly sends the slave RF tag's identification to the reader when it repeatedly receives the custom read command during the custom command receiving mode. This ensures that as long as there is a slave RF tag associated with the master RF tag, the slave RF tag can be read by the reader, so that the identification of the slave RF tag is sent to the reader, ensuring the success rate of identification and pairing. The reader keeps the RF electric field turned on, and at this time only one master RF tag is in the state of sending an activation signal. As long as the reader does not turn off the RF electric field, the activation signal can be maintained; under this premise, the reader can repeatedly send the custom read command, so that it can be ensured that the reader successfully obtains the identification of the slave RF tag when there is a slave RF tag connected to the master RF tag. Embodiment 4

[0088] A radio frequency identification method is applied to the radio frequency identification system provided in the second embodiment, such as Figure 9-11 As shown, the radio frequency identification method includes:

[0089] S1. The reader turns on the radio frequency electric field. The main radio frequency tag and the slave radio frequency tag enter the electric field and are powered on for initialization. The main radio frequency tag enters the general RFID protocol mode by default. The slave radio frequency tag needs to be pre-configured by the reader, that is, the characteristic value data is written to the specified address of the specified area of ​​the slave radio frequency tag. After the configuration is completed, the data will be saved when the power is turned off. Each time the slave radio frequency tag is powered on, this characteristic value will be checked to determine whether the slave radio frequency tag enters the activation signal detection mode. The reader sends an inventory instruction. The inventory instruction adopts the general RFID protocol, which can quickly batch inventory the main radio frequency tags. The inventory instruction is an instruction set, including anti-collision instructions, wake-up instructions, and instructions for obtaining the main tag identification. The present invention obtains the identification of the main radio frequency tag by sending an inventory instruction through the reader / writer. It is not necessary to know and store the identification of the main radio frequency tag in advance. The identification of the main radio frequency tag can be obtained while starting the identification and pairing process. Even if a new main radio frequency tag appears temporarily, it can be operated quickly to improve the efficiency of identification and matching.

[0090] S2, the master RFID tag receives the inventory command from the reader, responds to the inventory command from the reader, and sends the master RFID tag's identification to the reader. Because only the master RFID tag enters the universal RFID protocol mode, the inventory command will only be responded to by the master RFID tag, and the slave RFID tag will not respond, which speeds up the response and improves the response accuracy.

[0091] S3. The reader receives and saves the identification of the master RFID tag. Each master RFID tag has a unique identification, which can be a unique digital code. If the reader does not receive the identification of the master RFID tag within an inventory cycle, there may be a situation where the inventory fails or there is no master RFID tag, and the inventory instruction can continue to be sent.

[0092] S4, the reader sends a read instruction, which includes a designated reading area and a designated reading address. The master RFID tag sends an activation signal to the slave RFID tag only after detecting the read instruction (i.e., reading the designated address of the designated area).

[0093] S5. After the master RFID tag detects the read command, it sends an activation signal to the slave RFID tag. By sending a read command to the master RFID tag, and then sending an activation signal to the slave RFID tag after the master RFID tag detects the read command, the timing of the master RFID tag sending the activation signal can be controlled. In this way, after the master RFID tag responds to the tag identification to the reader, the reader continues to send an electric field to the master RFID tag to charge the master RFID tag, ensuring that the energy of the master RFID tag is sufficient to stimulate the activation signal. For example, if some devices that require relatively large driving energy are used to send activation signals, it will take a longer time to charge before the activation signal can be sent. Therefore, adding this step can control the timing of the activation signal.

[0094] S6. When the slave RFID tag is powered on, it will check the characteristic value data written in the specified address of the specified area to determine that the slave RFID tag has entered the activation signal detection mode. When the slave RFID tag receives the activation information sent by the master RFID tag, it responds to the activation signal. Because only the slave RFID tag enters the activation signal detection mode, at this time the slave RFID tag only responds to the activation signal and only the slave RFID tag associated with the master RFID tag will respond to the activation signal and enter the waiting mode for receiving the custom read instruction.

[0095] S7. The reader sends a custom read instruction to all slave RFID tags. The custom read instruction includes a frame header, an information field, and a check code field.

[0096] S8. At this time, only the master RF tag that responds to the tag identification of the reader will activate the slave RF tag corresponding to it. Therefore, only this corresponding slave RF tag detects the activation signal and enters the waiting mode for receiving the custom read instruction. The slave RF tag receives the custom read instruction in the waiting mode for receiving the custom read instruction and sends the identification of the slave RF tag to the reader. In other words, when the reader obtains the identification of the slave RF tag, only the slave RF tag responds and only the slave RF tag paired with the master RF tag responds. The master RF tag does not participate in the process, and the signaling process is simpler and the reading speed is faster. Each slave RF tag has a unique identification, which can be a string of unique digital codes. The response content of the slave RF tag in response to the custom read instruction sent by the reader includes a frame header, information length, information field and checksum field. The frame header uses the user-defined instruction field in the general RFID protocol, so it complies with the general RFID protocol and will not conflict with other instructions in the general RFID. The information field is customized content, the check code field can verify the correctness of the entire instruction, and the information length can verify the integrity of the entire instruction. In this way, the reader can identify the RFID tag of this system, avoid confusion with tags of other systems, and improve the reading accuracy.

[0097] S9, the reader receives and saves the identification of the slave RFID tag, and determines the corresponding connection relationship between the master RFID tag and the slave RFID tag according to the received identification of the master RFID tag and the slave RFID tag. At this time, the reader completes the identification reading of the master RFID tag and the slave RFID tag, thereby realizing the matching operation of the two tags.

[0098] Repeat the above steps to complete the pairing of all main RFID tags.

[0099] The reader turns on the RF electric field before sending the inventory command, and the RF electric field is maintained until the slave RF tag sends the slave RF tag's identification to the reader. After the master RF tag sends the activation signal to the slave RF tag, the activation signal is output while the RF electric field is maintained. The reader repeatedly sends the custom read command, and the slave RF tag repeatedly sends the slave RF tag's identification to the reader when it repeatedly receives the custom read command during the custom command receiving mode. This ensures that as long as there is a slave RF tag associated with the master RF tag, the slave RF tag can be read by the reader, so that the identification of the slave RF tag is sent to the reader, ensuring the success rate of identification and pairing. The reader keeps the RF electric field turned on, and at this time only one master RF tag is in the state of sending an activation signal. As long as the reader does not turn off the RF electric field, the activation signal can be maintained; under this premise, the reader can repeatedly send the custom read command, so that it can be ensured that the reader successfully obtains the identification of the slave RF tag when there is a slave RF tag connected to the master RF tag.

[0100] In the radio frequency identification system and method described in the present invention, the reader does not need to know the identification of the main radio frequency tag in advance, and can execute the general RFID protocol to complete operations such as tag inventory and activation signal. The main radio frequency tag identification can be obtained and stored while the tag identification pairing process is started. Even if a new main radio frequency tag temporarily appears, it can be operated quickly, which speeds up the identification and matching speed. When the reader fails to obtain the tag identification of the slave radio frequency tag, it does not need to start a new identification process from the beginning. As long as the reader resends the custom read instruction to read the identification of the slave radio frequency tag, the identification process can be continued, which improves the efficiency of identification.

[0101] When the existing technology reads the main RFID tag and the slave RFID tag identification, a broadcast instruction is sent, and the main RFID tag and the slave RFID tag will participate in the response, the collision rate between the tags is high, and the reading rate is low. However, when the present invention obtains the main RFID tag identification, only the main RFID tag participates, and the slave RFID tag does not respond. When obtaining the slave RFID tag identification, only the slave RFID tag responds, and the main RFID tag does not participate. The signaling process is simpler and the reading speed is faster. The existing technology requires the reader to distinguish whether it is the identification of the main RFID tag or the identification of the slave RFID tag, and then make corresponding matching and binding. However, when the main RFID tag and the slave RFID tag have a one-to-one binding relationship, as long as the slave RFID tag is read, the main RFID tag corresponding to it is unique, and the reader can directly match and bind to complete the pairing of the tags, and the pairing accuracy can reach 100%. In the present invention, as long as the main RFID tag and the slave RFID tag are associated within an inventory cycle, there is only one main RFID tag and one slave RFID tag to respond, which is conducive to greatly improving the efficiency and accuracy of the corresponding connection relationship or pairing relationship between tags, and is particularly suitable for scenes that require connection and matching relationships.

[0102] The implementation methods of the present invention are not limited to this. According to the above content of the present invention, using common technical knowledge and customary means in the field, without departing from the above basic technical ideas of the present invention, the present invention can also make other various forms of modification, replacement or combination, all of which fall within the scope of protection of the present invention.

Claims

1. A radio frequency identification system, comprising a reader / writer, a master radio frequency tag and a slave radio frequency tag, characterized in that: The reader is configured to send an inventory command; the inventory command is a command set, including an anti-collision command, a wake-up command, and a master tag identification acquisition command; The master radio frequency tag is configured to send the identification of the master radio frequency tag to the reader / writer in response to an inventory instruction of the reader / writer; The reader / writer is also configured to receive and store the identification of the primary radio frequency tag; The master radio frequency tag is also configured to send an activation signal to the slave radio frequency tag; The slave RFID tag is configured to enter a waiting mode for receiving a custom read instruction in response to the activation signal; The reader is further configured to send a custom read instruction; the content of the custom read instruction includes a frame header, an information field and a check code field; The slave RFID tag is further configured to receive the custom read instruction in a waiting mode for receiving the custom read instruction, and send the identification of the slave RFID tag to the reader; the response content of the slave RFID tag in response to the custom read instruction sent by the reader includes a frame header, information length, information field and check code field; The reader / writer is further configured to receive and save the identification of the slave RFID tag, and determine the corresponding connection relationship between the master RFID tag and the slave RFID tag according to the received identifications of the master RFID tag and the slave RFID tag.

2. The radio frequency identification system according to claim 1, characterized in that: Before the master radio frequency tag is further configured to send an activation signal to the slave radio frequency tag, the method further includes: The reader / writer is also configured to send a read instruction; The master radio frequency tag is also configured to detect a read instruction.

3. The radio frequency identification system according to claim 1, characterized in that: The master radio frequency tag is a light source radio frequency tag, the slave radio frequency tag is a photosensitive radio frequency tag, and the master radio frequency tag and the slave radio frequency tag are connected to each other in a non-contact optical manner.

4. The radio frequency identification system according to claim 1, characterized in that: The master radio frequency tag is an electric signal radio frequency tag, the slave radio frequency tag is an electric signal detection radio frequency tag, and the master radio frequency tag is electrically connected to the slave radio frequency tag in a contact manner.

5. A radio frequency identification method, characterized in that: The method comprises: The reader sends an inventory command; the inventory command is a command set, including an anti-collision command, a wake-up command, and a master tag identification acquisition command; The master radio frequency tag sends the identification of the master radio frequency tag to the reader / writer in response to the inventory command of the reader / writer; The reader receives and stores the identification of the primary radio frequency tag; The master radio frequency tag sends an activation signal to the slave radio frequency tag; The slave radio frequency tag enters a waiting mode for receiving a custom read instruction in response to the activation signal; The reader sends a custom read instruction; the content of the custom read instruction sent by the reader includes a frame header, an information field and a check code field; The slave RFID tag receives the custom read instruction in a waiting mode for receiving a custom instruction, and sends the identification of the slave RFID tag to the reader / writer; the response content of the slave RFID tag in response to the custom read instruction sent by the reader / writer includes a frame header, information length, information field and check code field; The reader / writer receives and stores the identification of the slave radio frequency tag, and determines the corresponding connection relationship between the master radio frequency tag and the slave radio frequency tag according to the received identifications of the master radio frequency tag and the slave radio frequency tag.

6. The radio frequency identification method according to claim 5, characterized in that: Before the master radio frequency tag sends an activation signal to the slave radio frequency tag, the method further includes: The reader / writer sends a read instruction; The master radio frequency tag detects a read instruction.

7. The radio frequency identification method according to claim 5, characterized in that: The reader turns on the radio frequency electric field, and the master radio frequency tag and the slave radio frequency tag are powered on and initialized after entering the electric field. The master radio frequency tag enters the general RFID protocol mode by default, and the slave radio frequency tag is pre-configured by the reader and writes characteristic value data to the specified address of the specified area of ​​the slave radio frequency tag. After the configuration is completed, the characteristic value data is saved after power is turned off, and the characteristic value is checked each time the slave radio frequency tag is powered on to determine whether the slave radio frequency tag enters the activation signal detection mode.

8. The radio frequency identification method according to claim 5 or 6, characterized in that: The reader / writer turns on the radio frequency electric field before sending the inventory command, and the radio frequency electric field is maintained until the slave radio frequency tag sends the identification of the slave radio frequency tag to the reader / writer; After the master radio frequency tag sends an activation signal to the slave radio frequency tag, the activation signal is kept output during the period when the radio frequency electric field is maintained; The reader / writer repeatedly sends a custom read instruction; During the period of receiving the custom instruction mode, the slave radio frequency tag repeatedly sends the identification of the slave radio frequency tag to the reader / writer when repeatedly receiving the custom read instruction.

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