CN115664469A - Ultrahigh frequency RFID (radio frequency identification) inter-system communication method - Google Patents
Ultrahigh frequency RFID (radio frequency identification) inter-system communication method Download PDFInfo
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Abstract
The invention relates to a communication method between ultrahigh frequency RFID systems, belonging to the field of radio frequency identification. The method comprises the steps of deploying two ultrahigh frequency RFID systems and RFID relay tags which need to be in wireless communication; the RFID system which needs to send data writes the data into each relay label in sequence according to a specified format; and the two RFID systems poll the state of the relay tag in a time-sharing manner, and when the relay tag has data to be received, the two RFID systems read and analyze the data from the relay tags in sequence, and write the read state into the relay tag for the verification of the sending end. The method provided by the invention realizes the communication between the ultrahigh frequency RFID systems, can meet the requirements on scenes with low communication delay and low speed requirements, has the characteristics of low cost and simple realization, and is convenient to integrate into the existing RFID systems.
Description
Technical Field
The invention belongs to the field of radio frequency identification, and particularly relates to an ultrahigh frequency RFID intersystem communication method.
Background
In some application scenarios in large-scale open space, such as factories and storehouses, in order to improve the reading range and the reading efficiency of the ultrahigh frequency RFID system, multiple ultrahigh frequency RFID systems are often deployed, and each ultrahigh frequency RFID system cooperates to complete functions such as industrial automation or automatic storehouse management. The ultrahigh frequency RFID systems often need to communicate with each other to complete data exchange.
The common wired communication modes include serial port communication and network communication, and the common wireless communication modes include Bluetooth, WIFI, ZIGBEE, LORA and the like. The communication between ultrahigh frequency RFID systems is realized by adopting the communication modes, but some problems exist. On one hand, the wired communication mode is inconvenient to deploy in the scene that some RFID systems need to keep moving; on the other hand, adding various wired and wireless communication modes to the system requires modifying the system to integrate related modules, which increases the cost and complexity of the system.
Because the ultrahigh frequency RFID system is a wireless communication system, if the communication between the ultrahigh frequency RFID systems can be realized by utilizing the characteristic, the system can be simplified, and the cost can be saved. The invention designs a communication method between ultrahigh frequency RFID systems based on the idea and the practical requirement.
Disclosure of Invention
Technical problem to be solved
The invention provides a communication method between ultrahigh frequency RFID systems, and aims to solve the problems that the existing ultrahigh frequency RFID systems are inconvenient to deploy in the scene of keeping motion, and the cost and the complexity of the system are increased.
(II) technical scheme
In order to solve the technical problem, the invention provides a communication method between ultrahigh frequency RFID systems, which comprises the following steps:
s1, deployment of an ultrahigh frequency RFID system: deploying an ultrahigh frequency RFID system and a plurality of RFID relay tags in a scene needing communication; the relay tag is used as communication data relay of two ultrahigh frequency RFID systems, and the data format and the reading and writing sequence of the relay tag are appointed in advance;
s2, data sending: the ultrahigh frequency RFID system needing to send data checks the relay tags in the working range at first, determines that the communication between the system and the relay tags is smooth, sequentially selects each relay tag according to the sequence of the relay tags agreed in advance, and writes data according to the agreed data format;
s3, a data receiving step: the ultrahigh frequency RFID system reads the data of the relay tag, if the corresponding mark is set, the data of the relay tag is read according to the appointed read-write sequence of the relay tag, and if the verification is passed, the mark of the relay tag is removed; otherwise, the mark of the relay tag is set to be abnormal, and the RFID ultrahigh frequency system for sending data resends the data.
Further, in step S1, an ultrahigh frequency RFID system includes an RFID reader, RFID tags, and some RFID relay tags.
Further, in the step S1, two ultrahigh frequency RFID systems are deployed in a normal working environment where wireless communication is required, so as to ensure that a cross stable read-write area exists between the two ultrahigh frequency RFID systems, and the relay tag is deployed in a stable read-write area common to the two ultrahigh frequency RFID systems.
Further, the LBT function of the two UHF RFID systems is started, namely the occupancy condition of the detection channel before the UHF RFID system works determines whether to start working or not.
Further, in the step S1, numbers of the two ultrahigh frequency RFID systems and numbers of the respective RFID relay tags need to be agreed, that is, number information is bound to tag data and integrated into the ultrahigh frequency RFID systems.
Further, in the step S1, when deploying, a data format of the relay tag needs to be agreed, and a user area of the RFID tag is selected as a storage area for storing communication data of the two ultrahigh frequency RFID systems.
Further, the data format comprises a '1- > 2' mark, a '2- > 1' mark, a bitlength field, a crc field and a data field;
the '1- > 2' flag is set to indicate that the data stored in the relay tag is the data transmitted from the RFID ultrahigh frequency system 1 to the RFID ultrahigh frequency system 2;
the flag of "2- >1" is set to indicate that the data stored in the relay tag is the data transmitted from the RFID uhf system 2 to the RFID uhf system 1;
the bitlength field represents the digit of the relay data stored in the current relay tag, and the RFID ultrahigh frequency system receiving the data acquires the digit of the effective data in the storage area from the bitlength, namely the length of the read data is determined;
the crc field indicates a crc check value for the data stored in the relay tag, and the check value is a check value for the whole relay data;
the data field is communication data of two ultrahigh frequency RFID systems.
Further, the ultrahigh frequency RFID system determines whether data sent to the ultrahigh frequency RFID system exists currently or not by polling the two zone bits of the relay tag, and if so, the ultrahigh frequency RFID system performs a subsequent data receiving process; setting both flag bits to indicate that the communication is abnormal; the sending data end checks the two flag bits after the sending is finished, and if the two flag bits are abnormal, a retransmission process is carried out; and if the two flag bits are both 0, the current relay label is idle, and the transmitting end is waited to write the communication data.
Further, the step S2 specifically includes: the data sending end performs one round of inventory on the RFID tags within the reading range to determine the existence of each relay tag; then writing the data into the storage areas of the relay labels in sequence according to the sequence of the serial numbers of the relay labels and a specified data format; setting a flag bit corresponding to the receiving end to indicate that the data is to be read by the receiving end; after the sending end finishes sending, the two flag bits of the relay label No. 1 are polled and checked, if both are 1, the exception is indicated, and retransmission is needed.
Further, the step S3 specifically includes: the data receiving end polls the zone bit in the relay label No. 1, if the zone bit corresponding to the data receiving end is set, the data in the relay label is indicated to be read, the data are sequentially read according to the appointed relay label data and are verified, and if the verification is correct, the zone bit corresponding to the data receiving end is reset; and if the verification fails, setting both the flag bits to indicate that the communication is abnormal, and retransmitting the terminal to be sent after detecting the abnormality.
(III) advantageous effects
The invention provides a communication method between ultrahigh frequency RFID systems, which realizes the communication between the ultrahigh frequency RFID systems by designing a deployment mode and a communication data structure, can meet the requirements on scenes with low communication delay and low speed requirements, has the characteristics of low cost and simple realization, and is convenient to integrate into the existing RFID systems.
Drawings
FIG. 1 is a schematic diagram of the deployment of the communication method between ultrahigh frequency RFID systems according to the present invention;
fig. 2 is a schematic diagram of a relay tag data format;
fig. 3 is a schematic process flow diagram.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The invention discloses a communication method between ultrahigh frequency RFID systems. The method comprises the following steps: and (1) deploying an ultrahigh frequency RFID system. Two ultra-high frequency RFID systems and RFID relay tags that need to communicate wirelessly are deployed. And (2) sending data. The RFID system that needs to transmit data writes the data into each relay tag in sequence according to a predetermined format. And (3) receiving data. And the two RFID systems poll the state of the relay tag in a time-sharing manner, and when the relay tag has data to be received, the two RFID systems read and analyze the data from the relay tags in sequence, and write the read state into the relay tag for the verification of the sending end.
The method provided by the invention realizes the communication between the ultrahigh frequency RFID systems, can meet the requirements on scenes with low communication delay and low speed requirements, has the characteristics of low cost and simple realization, and is convenient to integrate into the existing RFID systems.
The invention aims to provide a communication method between ultrahigh frequency RFID systems, which realizes communication between the ultrahigh frequency RFID systems in the same scene.
The method comprises the following steps:
s1, deploying an ultrahigh frequency RFID system. Deploying an ultrahigh frequency RFID system and a plurality of RFID relay tags in a scene needing communication; the relay tag is used as communication data transfer of two ultrahigh frequency RFID systems, and the data format and the reading and writing sequence of the relay tag are appointed in advance.
S2, data sending: the ultrahigh frequency RFID system needing to send data firstly checks the relay tags in the working range, determines smooth communication with the relay tags, sequentially selects each relay tag according to a preset relay tag sequence, and writes data according to a preset data format.
S3, a data receiving step: and reading the data of the relay tag by the ultrahigh frequency RFID system, and reading the data of the relay tag according to the appointed read-write sequence of the relay tag if the corresponding mark is found to be set. If the verification is passed, clearing the mark of the relay label; otherwise, the mark of the relay tag is set to be abnormal, and the RFID ultrahigh frequency system for sending data resends the data.
Example 1:
in order to implement the present invention, it is necessary to utilize the LBT (listen before talk) function in the ultra-high frequency RFID system to scan whether the same frequency band interference exists in the channel before the RFID system occupies the channel.
The method comprises the following steps:
(1) And (5) deploying the ultrahigh frequency RFID system. An ultrahigh frequency RFID system is deployed in a scene needing communication, and one ultrahigh frequency RFID system comprises an RFID reader-writer, RFID labels and some RFID relay labels. The relay tag is used for transferring communication data of two ultrahigh frequency RFID systems, and the data format and the reading and writing sequence of the relay tag need to be agreed in advance.
In specific implementation, two ultrahigh frequency RFID systems are deployed in a normal working environment where wireless communication is required, so that a crossed stable read-write area is ensured between the two ultrahigh frequency RFID systems. In order to avoid mutual interference in the work of the two ultrahigh frequency RFID systems, the LBT function of the two ultrahigh frequency RFID systems is started, namely, whether the ultrahigh frequency RFID systems start to work is determined according to the occupation condition of a detection channel before the ultrahigh frequency RFID systems work.
As shown in fig. 1, the relay tag is disposed in a stable read-write area common to two uhf RFID systems, and a plurality of relay tags can be appropriately disposed.
When the system is deployed, the serial numbers of the two ultrahigh frequency RFID systems and the serial numbers of the RFID relay tags need to be agreed, namely, the serial number information is bound with the tag data and integrated into the ultrahigh frequency RFID systems.
When the relay tag is deployed, the data format of the relay tag needs to be appointed, and a user area of the RFID tag can be selected as a storage area for storing communication data of the two ultrahigh frequency RFID systems. The specific format of the data in the storage area is shown in fig. 2, and includes:
(11) The '1- > 2' flag is set to indicate that the data stored in the relay tag is the data transmitted from the RFID ultrahigh frequency system 1 to the RFID ultrahigh frequency system 2;
(12) The '2- > 1' flag is set to indicate that the data stored in the relay tag is the data transferred from the RFID uhf system 2 to the RFID uhf system 1.
The ultrahigh frequency RFID system can confirm whether data sent to the system exist currently or not by polling the two zone bits of the relay tag, and if so, the subsequent data receiving process is carried out. And if both flag bits are set, the communication is abnormal. The data transmitting end can check the two flag bits after the data transmission is completed, and if the data transmitting end has an abnormality, the retransmission process is carried out. And if the two flag bits are both 0, the current relay label is idle, and the transmitting end is waited to write the communication data.
(13) The bit length field represents the bit number of the relay data stored in the current relay tag, and the RFID ultrahigh frequency system receiving the data can acquire the bit number of the effective data in the storage area from the bit length, namely, the length of the read data is determined.
(14) The crc field indicates crc for data stored in the relay tag, in order to avoid data errors in the transmission process, crc check is set to protect the relay data, and the check value is a check value for the whole relay data.
(15) The data field is communication data of two ultrahigh frequency RFID systems.
Data transmission step S2: and the data sending end performs one round of inventory on the RFID tags within the reading range to determine the existence of each relay tag. And then writing the data into the storage areas of the relay tags in sequence according to the sequence of the relay tag serial numbers and a specified data format. And setting the flag bit corresponding to the receiving end to indicate that the data is to be read by the receiving end. After the sending end finishes sending, the two flag bits of the relay label No. 1 are polled and checked, if both are 1, the exception is indicated, and retransmission is needed.
Data reception step S3: the data receiving end polls the zone bit in the relay label No. 1, if the zone bit corresponding to the data receiving end is set, the data in the relay label is indicated to be read, the data are sequentially read according to the appointed relay label data and are verified, and if the verification is correct, the zone bit corresponding to the data receiving end is reset; and if the verification fails, setting both the flag bits to indicate that the communication is abnormal, and retransmitting the terminal to be sent after detecting the abnormality.
The method provided by the invention realizes the communication between the ultrahigh frequency RFID systems, can meet the requirements on scenes with low communication delay and low speed requirements, has the characteristics of low cost and simple realization, and is convenient to integrate into the existing RFID systems.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A communication method between ultrahigh frequency RFID systems is characterized by comprising the following steps:
s1, deployment of an ultrahigh frequency RFID system: deploying an ultrahigh frequency RFID system and a plurality of RFID relay tags in a scene needing communication; the relay tag is used as communication data transfer of two ultrahigh frequency RFID systems, and the data format and the reading and writing sequence of the relay tag are agreed in advance;
s2, data sending: the ultrahigh frequency RFID system needing to send data checks the relay tags in the working range at first, determines that the communication between the system and the relay tags is smooth, sequentially selects each relay tag according to the sequence of the relay tags agreed in advance, and writes data according to the agreed data format;
s3, a data receiving step: the ultrahigh frequency RFID system reads the data of the relay tag, if the corresponding mark is set, the data of the relay tag is read according to the appointed read-write sequence of the relay tag, and if the verification is passed, the mark of the relay tag is removed; otherwise, the mark of the relay tag is set to be abnormal, and the RFID ultrahigh frequency system for sending data resends the data.
2. The communication method according to claim 1, wherein in step S1, one uhf RFID system comprises RFID readers, RFID tags, and some RFID relay tags.
3. The communication method according to claim 1, wherein in step S1, two uhf RFID systems are deployed in a normal working environment where wireless communication is required, so as to ensure that there is a cross stable read-write area between the two uhf RFID systems, and the relay tag is deployed in a stable read-write area common to the two uhf RFID systems.
4. The communication method according to claim 3, wherein the LBT function of the UHF RFID systems is turned on, that is, whether to start the operation is determined by detecting the occupancy of the channel before the UHF RFID systems operate.
5. The communication method according to claim 1, wherein in step S1, the numbers of the two uhf RFID systems and the numbers of the RFID relay tags are agreed, that is, the number information is bound to the tag data and integrated into the uhf RFID systems.
6. The communication method according to claim 1, wherein in step S1, a data format of the relay tag needs to be agreed upon during deployment, and a user area of the RFID tag is selected as a storage area for storing communication data of the two uhf RFID systems.
7. The communication method between UHF RFID systems of claim 6, wherein the data format comprises a "1- >2" flag, a "2- >1" flag, a bit length field, a crc field, and a data field;
the flag of "1- >2" is set, which indicates that the data stored in the relay tag is the data transmitted from the RFID uhf system 1 to the RFID uhf system 2;
the flag of "2- >1" is set to indicate that the data stored in the relay tag is the data transmitted from the RFID uhf system 2 to the RFID uhf system 1;
the bit length field represents the bit number of relay data stored in the current relay tag, and the RFID ultrahigh frequency system receiving the data acquires the bit number of effective data in the storage area from the bit length field, namely the length of the read data is determined;
the crc field indicates a crc check value for the data stored in the relay tag, and the check value is a check value for the whole relay data;
the data field is communication data of two ultrahigh frequency RFID systems.
8. The communication method according to claim 7, wherein the uhf RFID system determines whether there is data currently transmitted to itself by polling the two flag bits of the relay tag, and if so, performs a subsequent data receiving process; setting both flag bits to indicate that the communication is abnormal; the data sending end checks the two flag bits after the data sending is finished, and if the two flag bits are abnormal, the retransmission process is carried out; and if the two flag bits are both 0, the current relay label is idle, and the transmitting end is waited to write the communication data.
9. The uhf RFID intersystem communication method of any one of claims 1 to 8, wherein the step S2 specifically includes: the data sending end performs one round of inventory on the RFID tags within the reading range to determine the existence of each relay tag; then writing the data into the storage areas of the relay labels in sequence according to the sequence of the serial numbers of the relay labels and a specified data format; setting a flag bit corresponding to the receiving end to indicate that the data is to be read by the receiving end; after the sending end finishes sending, the two flag bits of the relay label No. 1 are polled and checked, if both are 1, the exception is indicated, and retransmission is needed.
10. The uhf RFID intersystem communication method of claim 9, wherein the step S3 specifically includes: the data receiving end polls the zone bit in the relay label No. 1, if the zone bit corresponding to the data receiving end is set, the data in the relay label is indicated to be read, the data are sequentially read according to the appointed relay label data and are verified, and if the verification is correct, the zone bit corresponding to the data receiving end is reset; and if the verification fails, setting both the flag bits to indicate that the communication is abnormal, and repeating the transmission operation after the to-be-transmitted terminal detects the abnormality.
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