WO2024032082A1 - Procédé d'identification de lecture-écriture multi-étiquettes rfid et dispositif associé - Google Patents

Procédé d'identification de lecture-écriture multi-étiquettes rfid et dispositif associé Download PDF

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Publication number
WO2024032082A1
WO2024032082A1 PCT/CN2023/095656 CN2023095656W WO2024032082A1 WO 2024032082 A1 WO2024032082 A1 WO 2024032082A1 CN 2023095656 W CN2023095656 W CN 2023095656W WO 2024032082 A1 WO2024032082 A1 WO 2024032082A1
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WIPO (PCT)
Prior art keywords
tag
access
tags
channel
reader
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PCT/CN2023/095656
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English (en)
Chinese (zh)
Inventor
任占阳
赵海峰
胡磊
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华为技术有限公司
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Publication of WO2024032082A1 publication Critical patent/WO2024032082A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
    • G06K7/10029—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Definitions

  • This application relates to the field of video recognition technology, and in particular to an RFID multi-tag reading and writing identification method and related equipment.
  • Radio frequency identification (RFID) technology is a type of automatic identification technology. It performs non-contact two-way data communication through wireless radio frequency. It uses wireless radio frequency to read and write recording media (electronic tags or radio frequency cards) to achieve identification. Target and purpose of data exchange.
  • RFID Radio frequency identification
  • tags tags usually exist at the same time and send data to the reader (reader) at the same time, resulting in response conflicts. Inter-tag conflicts are an important factor affecting the tag reading speed of the RFID system. factor.
  • the RFID system based on time slot ALOHA still has the following shortcomings: Since the number of time slots required for data transmission is fixed, it cannot be dynamically adjusted at will. When the number of tags is large, the number of time slots is not enough, resulting in tags in the time slots. The collision rate increases sharply, which also sharply reduces the identification efficiency and channel utilization rate of the system; when the number of tags is small, if there are no tags transmitting data in some time slots, many empty time slots will be generated, resulting in a waste of time slots. .
  • Embodiments of the present application provide an RFID multi-tag reading and writing identification method and related equipment, which are used to improve tag access efficiency and RFID system inventory efficiency.
  • embodiments of the present application provide an RFID multi-tag reading and writing method, including:
  • Allocate a transmission channel to the accessed tag wherein the transmission channel belongs to a transmission channel set, and the transmission channel set includes transmission channels of N frequencies, where N is an integer greater than 1;
  • allocating a transmission channel to the accessed tag specifically includes:
  • tags will continue to be accessed in the time slots within the frame length range until the number of accessed tags is not less than N. ;
  • N tags are selected from the accessed tags, and N transmission channels in the transmission channel set are allocated to the N tags respectively.
  • allocating a transmission channel to the accessed tag specifically includes:
  • N If the number of accessed tags is greater than N, select N tags from the accessed tags, and allocate N transmission channels in the transmission channel set to the N tags respectively;
  • a transmission channel is allocated to each of the accessed tags.
  • a terminator is sent to the allocated tag, and the terminator is used to instruct the allocated tag to send data.
  • the transmission channel set and the access channel set are the same channel set.
  • the uplink preambles corresponding to any two transmission channels are orthogonal or pseudo-orthogonal.
  • the access channel set specifically includes multiple channel parameters used to calculate the backscatter link frequency (BLF);
  • the plurality of channel parameters are specifically:
  • this application provides an RFID tag identification method, including:
  • the access channel set specifically includes multiple channel parameters used to calculate the backscatter link frequency (BLF);
  • Selecting an access channel in the access channel set specifically includes calculating the corresponding BLF as the access frequency point according to the channel parameters;
  • the BLF is the quotient of the DR and the tag-reader calibration (TRcal) signal;
  • the BLF is the quotient of DR and an integer multiple of the TRcal signal
  • the BLF is the quotient of the DR and the TRcal signal
  • the BLF is the product of the preset frequency and the positive number.
  • sending data on the transmission channel specifically includes:
  • this application provides an RFID multi-tag reader and writer, including:
  • a sending module configured to send an access channel set and a frame length, where the access channel set includes multiple frequency access channels, and the frame length includes multiple time slots;
  • a receiving module configured to access the tag through the access channel in the access channel set in the first time slot
  • a processing module configured to allocate a transmission channel to the accessed tag, wherein the transmission channel belongs to a transmission channel set, and the transmission channel set includes transmission channels of N frequencies, where N is an integer greater than 1;
  • the receiving module is also used to obtain the data sent by the allocated tag on the corresponding transmission channel.
  • the receiving module is specifically configured to continuously access tags of M time slots, where M is an integer greater than 0;
  • the processing module is specifically configured to select N tags from the accessed tags, and allocate N transmissions in the transmission channel set to the N tags. channel;
  • the processing module is specifically configured to allocate a transmission channel to each of the accessed tags.
  • the sending module is also configured to send a terminator to the allocated label, where the terminator is used to instruct the allocated label to send data.
  • the transmission channel set and the access channel set are the same channel set.
  • this application provides an RFID tag, including:
  • a processing module configured to respond to the access channel set and frame length sent by the reader/writer, select an access time slot in the frame length, and select an access channel in the access channel set, wherein the access The channel set includes channels of multiple frequencies, and the frame length includes multiple time slots;
  • a sending module configured to send an access request to the reader through the access channel in the access time slot
  • a receiving module used to receive the transmission channel assigned by the reader/writer
  • the sending module is also used to send data on the transmission channel.
  • the receiving module is also used to receive the terminator sent by the reader/writer;
  • the sending module is specifically configured to send data on the transmission channel in response to the end character.
  • this application provides an RFID identification system, which includes at least one reader and a plurality of tags, wherein:
  • the reader/writer is used to perform the RFID multi-tag reading and writing method of the first aspect
  • the tag is used to perform the RFID tag identification method of the second aspect.
  • the present application provides a chip system.
  • the chip system includes a processor, and the processor is used to support a reader/writer to implement the RFID multi-tag reading and writing method of the first aspect.
  • the present application provides a chip system.
  • the chip system includes a processor, and the processor is configured to support tags to implement the RFID tag identification method of the second aspect.
  • the embodiment of the present application discloses an RFID multi-tag reading and writing identification method and related equipment.
  • the RFID multi-tag reading and writing method includes: sending out an access channel set and a frame length.
  • the access channel set includes multiple access channels, and the frame length is Including multiple time slots; in the first time slot, the tag is accessed through the access channel in the access channel set, where the first time slot is the time slot selected in the frame length by the accessed tag; for the accessed tag
  • the tag allocates a transmission channel, where the transmission channel belongs to a transmission channel set, and the transmission channel set includes transmission channels of N frequencies, where N is an integer greater than 1; obtain the data sent by the assigned tag on the corresponding transmission channel.
  • This application sends an access channel set including multiple access channels to the tag, so that several tags can access the reader through different channels in the same time slot, which improves the tag access efficiency.
  • the data transmission channel is reallocated to the tags, so that several tags can transmit data on different channels at the same time, increasing the channel occupancy rate, thus improving the system inventory efficiency and capacity.
  • Figure 1 is a method flow chart of an RFID multi-tag reading and writing method provided in Embodiment 1 of the present application;
  • Figure 2 is a method flow chart of an RFID multi-tag reading and writing method provided in Embodiment 2 of the present application.
  • Figure 3 is a method flow chart of an RFID tag identification method provided in Embodiment 3 of the present application.
  • FIG. 4 is a schematic diagram of an RFID multi-tag reading and writing identification provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of another RFID multi-tag reading and writing identification provided by the embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of an RFID multi-tag reader and writer provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of an RFID tag provided by an embodiment of the present application.
  • the embodiment of this application provides an RFID multi-tag reading and writing identification method and related equipment.
  • This application sends N channel parameters and frame lengths used to calculate BLF to the tags, so that several tags can pass different channels in the same time slot.
  • the channel is connected to the reader and writer, which improves the tag access efficiency.
  • the data transmission channel is reallocated to the tag, so that several tags can transmit data on different channels at the same time, improving the channel occupancy rate. This improves system inventory efficiency and capacity.
  • the naming or numbering of steps in this application does not mean that the steps in the method flow must be executed in the time/logical sequence indicated by the naming or numbering.
  • the process steps that have been named or numbered can be implemented according to the purpose to be achieved. The order of execution can be changed for technical purposes, as long as the same or similar technical effect can be achieved.
  • the division of units presented in this application is a logical division. In actual applications, there may be other divisions. For example, multiple units may be combined or integrated into another system, or some features may be ignored. , or not executed.
  • the coupling or direct coupling or communication connection between the units shown or discussed may be through some interfaces, and the indirect coupling or communication connection between units may be electrical or other similar forms. There are no restrictions in the application.
  • the units or subunits described as separate components may or may not be physically separated, may or may not be physical units, or may be distributed into multiple circuit units, and some or all of them may be selected according to actual needs. unit to achieve the purpose of this application plan.
  • a radio frequency identification (RFID) system usually includes a reader/writer and several tags.
  • the tag's RFID chip stores relevant data information.
  • the reader/writer reads and writes tag data through radio frequency signals.
  • the tag's data information Including the corresponding identification number (Identity document, ID) and cyclic redundancy check (cyclical redundancy check, CRC).
  • ID identification number
  • CRC cyclical redundancy check
  • the connection process includes: the reader sends a query command with a certain frequency, and the query command includes the frequency of the access channel; when After receiving the query command, the tag sends a random number on the corresponding frequency according to the access channel in the query command; when the tag receives the random number returned by the reader, the connection between the tag and the reader is successfully established. This means that the tag is successfully connected to the reader and can send data. When the tag does not receive the random number returned by the reader or the random number received is different from the random number sent, it means that the tag has not successfully accessed the reader and will not send data until the next time it receives a read Writer query command.
  • the steps of tag access include: the tag calculates the backscatter link frequency (BLF) based on the relevant information in the Query command issued by the reader, and then sends a random number to the reader on the BLF; because the tag The calculated BLF is the same, so when multiple tags send random numbers to the reader on the BLF at the same time, conflicts will occur between multiple tags, that is, a tag collision occurs, and the reader will not be able to After receiving the random numbers sent by the multiple tags, the random numbers cannot be fed back. At this time, the tag access fails.
  • BLF backscatter link frequency
  • Embodiment 1 of the present application provides an RFID multi-tag reading and writing method, which can be applied to RFID systems.
  • the RFID multi-tag reading and writing method provided by the embodiment of the present application is executed by an RFID reader/writer.
  • Figure 1 is a method flow chart of an RFID multi-tag reading and writing method provided in Embodiment 1 of the present application, including:
  • the reader first needs to send out an initial query command so that the tag can establish a connection with the reader based on the information in the query command.
  • the query command carries an access channel set and a frame length.
  • the access channel set includes access channels of multiple frequencies, and the frame length includes multiple time slots.
  • the command sent out includes an access channel set, and the access channel set includes access channels of multiple frequencies. Therefore, the tag can randomly select one of the access channels of multiple frequencies. One performs the access operation with the reader/writer.
  • the data rate returned by the electronic tag to the reader is defined in the EPC Class1Gen2 protocol as BLF.
  • the BLF of the tag is related to the Query command sent by the card reader.
  • the last Query command sent by the reader/writer will give two parameters, TRCAL and DR.
  • TRCAL is the value of BLF. Therefore, in the embodiment of this application, the access channel set can be defined to specifically include Multiple channel parameters used to calculate BLF.
  • the access channel set specifically includes N channel parameters, so the tag can randomly select one channel parameter among the N channel parameters for calculating the BLF, and then send data to the reader through the BLF.
  • the initial commands include Select, Query, QueryRep, etc.
  • the access channel set can be sent in one of the following four ways:
  • the tag-reader calibration signal (TRcal) parameters are the same as those in the existing technology, and are notified through the physical layer;
  • the DR is the same as the existing technology and is carried through the Query command.
  • the parameter set K is carried through the Query command.
  • the parameter set K contains N positive numbers.
  • N BLFs can be obtained, thus corresponding to N channels.
  • the data sent by tags on N frequency points starts with a preamble.
  • Preamble orthogonal or pseudo-orthogonal at different frequency points for example:
  • the reader/writer supports corresponding preamble demodulation.
  • tags can be randomly accessed in several slots.
  • the slot numbers of Q slots are defined as [1, Q ], define the channel numbers of N channels corresponding to BLF as [1, N] respectively; the tag randomly selects a channel number from [1, N], and randomly selects a time slot number from [1, Q], Assume that the channel number determined by the tag is n and the time slot number is q, then the tag sends a random number on time slot q and channel n.
  • Tags There are 5 tags (RN16) that select the same time slot for access according to the Query command carrying the channel parameter (BLF Set). 3 of them pass channel #1, channel #2 and channel #3 respectively. for access, another 2 Tags are accessed through channel #4. At this time, only label collision occurred on channel #4, resulting in access failure. However, tags corresponding to the other three channels were not affected and were successfully accessed, achieving multiple accesses in the same time slot. the purpose of a label.
  • multiple tags can be randomly selected from the access channel set and frame length. Only tags in the same time slot and the same access channel will collide. Compared with the tags in the related technology, In a time slot, only one tag is allowed to access. The method of this application improves the efficiency of tag access and at the same time reduces the probability of tag collision.
  • the tag After the tag selects the access time slot and access channel, it will access the reader through the corresponding access channel in the time slot. It should be noted that since there are multiple access channels in the access channel set, the number of tags accessed in the first time slot can also be multiple; of course, if no tag selects the first time slot (the time slot is idle) ), or there are two or more tags that select the same access channel in the first time slot (tag collision), then there may be no tag access in the first time slot. It can be understood that when the access channel set includes multiple channel parameters used to calculate the BLF, the access channel is the BLF calculated by the tag according to the selected channel parameters.
  • the reader/writer allocates a transmission channel to the connected tag, and the transmission channel is a channel for the tag to subsequently send data.
  • the transmission channel belongs to a transmission channel set, and the transmission channel set includes transmission channels of N frequencies, where N is an integer greater than 1.
  • the reader/writer can allocate a transmission channel to the tag by sending a scheduling indication to the accessed tag, and the scheduling indication is used to instruct the tag to send data through the corresponding transmission channel. It should be noted that the reader/writer sends a scheduling instruction to the tag to allocate a transmission channel for the tag.
  • the transmission channel is used for the tag to send data.
  • the transmission channel and the access channel can be channels of different frequencies, or they can be Channels with the same frequency. In short, the tag needs to perform data transmission operations on the transmission channel, and the transmission channel is assigned to the tag through the reader/writer.
  • the reader only sends scheduling instructions to tags that have successfully accessed. If the access is unsuccessful, it may mean that no tag has selected the time slot or there are multiple tags that have selected the same channel in the same time slot, that is, at this time Gap is idle or collided. Please refer to Figure 4. Since the two tags accessed through channel #4 collide, the access fails, so the two tags are not scheduled. The other three non-colliding tags are successfully connected to the reader, so the reader sends scheduling instructions to the three tags and allocates three different transmission channels to the three tags.
  • the transmission channel set and the access channel set can be the same channel set.
  • the scheduling instruction sent by the reader to the tag can be a specified channel number, which is used to indicate the BLF corresponding to the specified channel number of the first tag. Send data.
  • scheduling instructions can be sent through commands such as Query and QueryRep.
  • the BLF specified in the scheduling instruction may be the same as or different from the BLF selected during label access.
  • tags may be accessed in one time slot.
  • allocating the tags that are successfully accessed in each time slot Transmission channel so that tags will not conflict with other tags when sending data.
  • tags can transmit data on different transmission channels at the same time, increasing channel occupancy, thus improving system inventory efficiency and capacity.
  • a tag when assigned a transmission channel, it can send data on the corresponding transmission channel. Therefore, the reader/writer also obtains the data sent by the tag that has been allocated a transmission channel on the corresponding transmission channel.
  • the RFID multi-tag reading and writing method provided by the embodiment of the present application sends out the access channel set and frame length; accesses the tag through the access channel in the access channel set in the first time slot; allocates transmission for the accessed tag Channel; obtain the data sent by the assigned tag on the corresponding transmission channel, which improves the tag access success rate and channel occupancy rate, thus improving the system inventory efficiency and capacity.
  • Embodiment 2 of the present application provides an RFID multi-tag reading and writing method, which is executed by an RFID reader/writer. Please refer to Figure 2.
  • Figure 2 is a method flow chart of an RFID multi-tag reading and writing method provided in Embodiment 2 of the present application, including
  • step 201 is similar to step 101 in the above-mentioned Embodiment 1, and will not be described again here.
  • the access channel set includes access channels of multiple frequencies, and the frame length includes multiple time slots.
  • Step 202 is similar to the step of connecting the tag to the reader in step 102 in the first embodiment, and will not be described again here.
  • the timing when the reader/writer allocates transmission channels to tags can be when the number of connected tags is not less than the number of transmission channels, or when the reader/writer accumulates multiple access tags in time slots. , and then uniformly allocate transmission channels to the tags accessed in multiple time slots.
  • the first situation includes:
  • tags that have not sent data refer to the sum of the number of tags in the tag pool that have not yet been connected to the reader and the number of tags that have been connected to the reader but have not sent data.
  • Sending data refers to After the tag is connected to the reader, it sends the tag's data information to the reader.
  • the data information includes the corresponding ID and CRC. If the number of connected tags is less than the number of transmission channels in the transmission channel set, it means that after all the connected tags are allocated transmission channels, there will still be redundant transmission channels.
  • tags can be continuously accessed in time slots within the frame length range until N transmission channels can be allocated to tags.
  • the reader accesses the tags, it can use a certain tag estimation method to estimate the number of tags in the field, such as subtracting the number of tags that have sent data from the total number of tags in the tag pool. You can get the number of tags that have not sent data.
  • the number of connected tags is less than the number of transmission channels in the transmission channel set, it is determined whether there are any unconnected tags in the tag pool, and if so, access is continued. For example, there are 5 tags in the tag pool and N is 4. After accessing 3 tags in the first time slot, there are still 2 tags in the tag pool. Therefore, tag access continues in the second time slot.
  • the slot is a time slot after the first time slot.
  • the second time slot may be a time slot after the first time slot and with a tag accessed.
  • the reader/writer can also continue to access tags in chronological order.
  • the access time slot indicates the time slot in which the tag is successfully accessed.
  • N the number of channels
  • the reader will not allocate transmission channels to the two tags temporarily and continue to access the tags.
  • the second time slot is an idle time slot and no tag is accessed, the reader still does not transmit information.
  • channel allocation until two more tags are successfully accessed in the third time slot.
  • the four tags can be assigned to different transmission channels. Subsequently, the four tags can be used in different transmission channels at the same time. Send data to the reader and writer on the channel to increase the channel occupancy rate, thus improving the system inventory efficiency and capacity.
  • tags after continuous access to tags, if the number of accessed tags is greater than the number of transmission channels, the reader/writer will select the same number of tags as the number of transmission channels among the accessed tags, as These tags are allocated transmission channels, and unselected tags wait for the next scheduling by the reader. For example, when 3 tags are accessed in the first time slot and 2 tags are accessed in the second time slot, but the number of transmission channels N is 4, then only 4 tags will be allocated BLF, and the remaining 1 will continue to be retained. Access the tag list and wait for reader scheduling.
  • the second situation includes:
  • N select N tags from the accessed tags, and allocate N transmission channels in the transmission channel set to the N tags.
  • the reader/writer selects the same number of tags as the number of transmission channels among the connected tags, and allocates transmission channels to these tags. , unselected tags continue to wait for scheduling.
  • the terminator is used to indicate that the assigned label sends data.
  • the reader/writer can choose to allocate a transmission channel to each accessed tag after the tag is accessed in each time slot. Then the tag can pass through the transmission channel immediately after being assigned a transmission channel by the reader/writer. send data.
  • the reader/writer can also uniformly allocate transmission channels to the tags after accessing multiple time slots, thereby achieving the purpose of increasing the transmission channel occupancy rate and saving transmission costs. Therefore, it receives several access time slots. If the tag sends data, or receives data sent by N tags at the same time, then the tag sends data on the transmission channel after responding to the terminator sent by the reader/writer.
  • the data sent by the tags can be received at the same time.
  • the data mainly includes the tag ID and related protocol information, CRC check bits, etc.
  • the reader/writer can be set to receive tags sent by several time slots at the same time.
  • the data sent by N tags can also be set to receive data sent by N tags at the same time. Both data acquisition methods fall into the protection scope of this application.
  • the RFID multi-tag reading and writing method provided by the embodiment of the present application can receive data from multiple tags at the same time by accessing tags in multiple time slots, improve the channel occupancy rate of the transmission channel, and save the cost caused by multiple small-scale transmissions. losses and improve system inventory efficiency and capacity.
  • Embodiment 3 of the present application provides an RFID tag identification method, which can be applied to an RFID system.
  • the RFID tag identification method provided by the embodiment of the present application is executed by an RFID electronic tag.
  • Figure 3 is a method flow chart of an RFID tag identification method provided in Embodiment 3 of the present application, including:
  • the reader When the reader needs to obtain tag data, it will issue an initial query command. After receiving the information in the query command, the tag attempts to establish a connection with the reader.
  • the query command carries an access channel set and a frame length.
  • the access channel set includes multiple frequency channels
  • the frame length includes multiple time slots
  • N is an integer greater than 1.
  • the access channel set includes multiple channel parameters used to calculate the BLF.
  • the tag selects a channel parameter, calculates the corresponding BLF based on the channel parameter, and issues an access request to the reader on the BLF.
  • the EPC Class1 Gen2 protocol defines the data rate returned by the electronic tag to the reader as BLF.
  • the BLF of the tag is related to the Query command sent by the card reader.
  • the last Query command sent by the reader/writer will give two parameters, TRCAL and DR.
  • TRCAL is the value of BLF.
  • the channel parameter is the parameter for calculating BLF.
  • the access channel set includes N channel parameters, so the tag can randomly select one channel parameter among the N channel parameters to calculate the BLF, and then send data to the reader through the BLF.
  • the initial commands include Select, Query, QueryRep, etc.
  • the corresponding BLF can be calculated as an access frequency point in one of the following four ways:
  • the tag-reader calibration signal (TRcal) parameters are the same as those in the existing technology, and are notified through the physical layer;
  • the DR is the same as the existing technology and is carried through the Query command.
  • the parameter set K contains N positive numbers
  • N BLFs can be obtained, thus corresponding to N channels.
  • N frequency points start with a preamble.
  • Preamble orthogonal or pseudo-orthogonal at different frequency points for example:
  • the reader/writer supports corresponding preamble demodulation.
  • tags can be randomly accessed in several slots.
  • the slot numbers of Q slots are defined as [1, Q ], define the channel numbers of N channels corresponding to BLF as [1, N] respectively; the tag randomly selects a channel number from [1, N], and randomly selects a time slot number from [1, Q], Assume that the channel number determined by the tag is n and the time slot number is q, then the tag sends a random number on time slot q and channel n.
  • Tags There are 5 tags (RN16) that select the same time slot for access according to the Query command carrying the channel parameter (BLF Set). 3 of them pass channel #1, channel #2 and channel #3 respectively. For access, the other two tags accessed through channel #4. At this time, only the tag collision occurred on channel #4, causing the access to fail. However, the tags corresponding to the other three channels were not affected and were successfully accessed. This achieved The purpose of accessing multiple tags in the same time slot.
  • multiple tags can be randomly selected from the channel set and frame length. Only tags in the same time slot and the same channel will collide. , a method that allows only one tag to access, the method of this application improves the tag access efficiency, and at the same time reduces the collision probability of tags.
  • the reader When the tag is successfully connected to the reader, the reader will allocate a transmission channel to the tag.
  • This can be implemented in the form of sending scheduling instructions. That is, the tag receives the scheduling instructions sent by the reader.
  • the scheduling instructions are used to instruct the tag to send data. transmission channel.
  • the tag After the tag receives the scheduling instruction sent by the reader/writer, it switches the access channel to the transmission channel in the scheduling instruction to facilitate subsequent data transmission on the transmission channel.
  • the scheduling instruction can be a specified channel number, and the tag sends data according to the BLF corresponding to the specified channel number. It should be noted that the access channel and the transmission channel may be the same or different.
  • the reader/writer can choose to allocate a transmission channel to each accessed tag after the tag is accessed in each time slot. Then the tag can pass through the transmission channel immediately after being assigned a transmission channel by the reader/writer. send data.
  • the reader/writer can also uniformly allocate transmission channels to the tags after accessing multiple time slots, thereby achieving the purpose of increasing the transmission channel occupancy rate and saving transmission costs. Therefore, it receives several access time slots. If the tag sends data, or receives data sent by N tags at the same time, then the tag sends data on the transmission channel after responding to the terminator sent by the reader/writer.
  • the RFID tag identification method receives N channel parameters and frame lengths sent by the reader and writer for calculating BLF, selects the access time slot in the frame length, selects the channel parameters in the channel set, and calculates As an access frequency point, BLF receives the scheduling instructions sent by the reader after being connected to the reader and writes, and sends data on the designated frequency point according to the scheduling instructions, thereby achieving the purpose of increasing the channel occupancy rate, thereby improving the system inventory efficiency and capacity.
  • FIG. 6 is a schematic structural diagram of an RFID multi-tag reader and writer provided by an embodiment of the present application.
  • the reader/writer 600 provided in the embodiment of this application includes a sending module 601, a receiving module 602 and a processing module 603.
  • the sending module 601 and the receiving module 602 can implement corresponding communication functions, and the processing module 603 can be one or more chips configured in the reader/writer 600 for performing processing operations.
  • the reader/writer 600 can also include a storage module, which can be used to store instructions and/or data.
  • the processing module 603 can read the instructions and/or data in the storage module, so that the reader/writer 600 Implement the method embodiment shown in Figure 1.
  • the storage module can be a storage unit within the chip, such as a register, cache, etc.
  • the storage module can also be a storage unit located outside the chip, such as a ROM or other types of static storage devices that can store static information and instructions. , RAM, etc.
  • the processing module 603 is used to perform processing-related operations in the above method embodiments.
  • the sending module 601 is used to perform the sending operation in the above method embodiment shown in FIG. 1 .
  • the receiving module 602 is configured to perform the receiving operation in the method embodiment shown in FIG. 1 or FIG. 2 .
  • the reader/writer 600 is used to execute the following solution:
  • the sending module 601 is used to send an access channel set and a frame length.
  • the access channel set includes access channels of multiple frequencies, and the frame length includes multiple time slots;
  • the receiving module 602 is configured to access the tag through the access channel in the access channel set in the first time slot;
  • the processing module 603 is used to allocate transmission channels to the accessed tags, where the transmission channels belong to a transmission channel set, and the transmission channel set includes transmission channels of N frequencies, where N is an integer greater than 1;
  • the receiving module 602 is also used to obtain the data sent by the assigned tag on the corresponding transmission channel.
  • the receiving module 602 is specifically configured to continuously access tags of M time slots, where M is an integer greater than 0;
  • the processing module 603 is specifically configured to select N tags from the accessed tags, and allocate N transmission channels in the transmission channel set to the N tags respectively;
  • the processing module 603 is specifically configured to allocate a transmission channel to each accessed tag.
  • the sending module 601 is also configured to send an end character to the assigned tag, where the end character is used to instruct the assigned tag to send data.
  • the access channel set specifically includes multiple channel parameters used to calculate the backscatter link frequency (BLF):
  • FIG. 7 is a schematic structural diagram of an RFID tag provided by an embodiment of the present application.
  • the tag 700 provided in the embodiment of this application includes a sending module 701, a receiving module 702 and a processing module 703.
  • the sending module 701 and the receiving module 702 can implement corresponding communication functions, and the processing module 703 can be one or more chips configured in the tag 700 for performing processing operations.
  • the tag 700 can also include a storage module, which can be used to store instructions and/or data.
  • the processing module 703 can read the instructions and/or data in the storage module, so that the tag 700 can implement the previous figure 1 Method embodiment shown.
  • the storage module can be a storage unit within the chip, such as a register, cache, etc.
  • the storage module can also be a storage unit located outside the chip, such as a ROM or other types of static storage devices that can store static information and instructions. , RAM, etc.
  • the processing module 703 is used to perform processing-related operations in the above method embodiments.
  • the sending module 701 is used to perform the sending operation in the method embodiment shown in Figure 3 above.
  • the receiving module 702 is configured to perform the receiving operation in the above method embodiment shown in Figure 3.
  • tag 700 is used to execute the following scenario:
  • the processing module 703 is configured to respond to the access channel set and frame length sent by the reader/writer, select an access time slot in the frame length, and select an access channel in the access channel set, where the access channel set includes multiple Frequency channel, frame length includes multiple time slots;
  • the sending module 701 is used to send an access request to the reader through the access channel in the access time slot;
  • the receiving module 702 is used to receive the transmission channel assigned by the reader/writer;
  • the sending module 701 is also used to send data on the transmission channel.
  • the receiving module 702 is also used to receive the terminator sent by the reader/writer;
  • the sending module 701 is specifically configured to send data on the transmission channel in response to the end character.
  • the embodiment of the present application provides an RFID identification system, which includes at least one reader and a plurality of tags, wherein:
  • the reader/writer is used to perform the RFID multi-tag reading and writing method described in Figure 1 or Figure 2;
  • the tag is used to perform the RFID tag identification method described in Figure 3.
  • An embodiment of the present application provides a chip system.
  • the chip system includes a processor, and the processor is used to support a reader/writer to implement the RFID multi-tag reading and writing method shown in Figure 1 or Figure 2.
  • An embodiment of the present application provides a chip system.
  • the chip system includes a processor, and the processor is used to support tags to implement the RFID tag identification method shown in Figure 3 above.
  • embodiments of the present application also provide a general processing system, for example, commonly referred to as a chip.
  • the general processing system includes: one or more microprocessors that provide processor functions; and an external memory that provides at least a part of the storage medium. , all of which are connected together with other supporting circuits through an external bus architecture.
  • the memory stores The instructions, when executed by the processor, cause the processor to perform some or all of the steps in any of the methods of FIGS. 1 to 3 , and/or other processes for the technology described in this application.
  • the steps of the method or algorithm described in connection with the disclosure of this application can be implemented in hardware or by a processor executing software instructions.
  • Software instructions can be composed of corresponding software modules, and the software modules can be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disks, mobile hard disks, CD-ROM or any other form of storage well known in the art. in the medium.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from the storage medium and write information to the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and storage media may be located in an ASIC. Additionally, the ASIC can be located in the terminal.
  • the processor and the storage medium may also exist as discrete components in the first communication device.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.
  • the above integrated units can be implemented in the form of hardware or software functional units.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program code. .

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Abstract

Des modes de réalisation de la présente demande divulguent un procédé d'identification de lecture-écriture multi-étiquettes RFID et un dispositif associé, destinés à être utilisés pour améliorer l'efficacité d'accès d'étiquette et l'efficacité d'inventaire d'un système RFID. Le procédé de lecture-écriture multi-étiquettes RFID consiste à : envoyer un ensemble de canaux d'accès et une longueur de trame, l'ensemble de canaux d'accès comprenant une pluralité de canaux d'accès, et la longueur de trame comprenant une pluralité d'intervalles de temps ; accéder à une étiquette dans un premier intervalle de temps au moyen d'un canal d'accès dans l'ensemble de canaux d'accès, le premier intervalle de temps étant un intervalle de temps sélectionné à partir de la longueur de trame par une étiquette accédée ; attribuer un canal de transmission pour les étiquettes accédées, le canal de transmission appartenant à un ensemble de canaux de transmission, l'ensemble de canaux de transmission comprenant des canaux de transmission de N fréquences, et N étant un nombre entier supérieur à 1 ; et acquérir des données envoyées, sur le canal de transmission correspondant, par les étiquettes auxquelles le canal de transmission a été attribué.
PCT/CN2023/095656 2022-08-10 2023-05-23 Procédé d'identification de lecture-écriture multi-étiquettes rfid et dispositif associé WO2024032082A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090092102A (ko) * 2008-02-26 2009-08-31 부산대학교 산학협력단 다중 라디오 채널을 이용한 ｒｆｉｄ 태그 충돌방지 방법및 장치
CN103514464A (zh) * 2013-09-27 2014-01-15 中国电子科技集团公司第七研究所 一种基于多信道的rfid多标签读写识别方法及装置
CN108446577A (zh) * 2018-02-28 2018-08-24 北京宏诚创新科技有限公司 高频/超高频rfid识别系统中的多标签防碰撞方法
US20180349753A1 (en) * 2016-02-12 2018-12-06 Frauhofer-Gesellschaff zur Foerderung der angewandlen Frorschung e. V. RFID Tag and RFID Reader

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090092102A (ko) * 2008-02-26 2009-08-31 부산대학교 산학협력단 다중 라디오 채널을 이용한 ｒｆｉｄ 태그 충돌방지 방법및 장치
CN103514464A (zh) * 2013-09-27 2014-01-15 中国电子科技集团公司第七研究所 一种基于多信道的rfid多标签读写识别方法及装置
US20180349753A1 (en) * 2016-02-12 2018-12-06 Frauhofer-Gesellschaff zur Foerderung der angewandlen Frorschung e. V. RFID Tag and RFID Reader
CN108446577A (zh) * 2018-02-28 2018-08-24 北京宏诚创新科技有限公司 高频/超高频rfid识别系统中的多标签防碰撞方法

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