CN115664469B - Communication method between ultrahigh frequency RFID systems - Google Patents
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Abstract
The invention relates to an ultrahigh frequency RFID (radio frequency identification) inter-system communication method, and belongs to the field of radio frequency identification. The invention deploys two ultrahigh frequency RFID systems and RFID relay tags which need to be in wireless communication; the RFID system which needs to send the data writes the data into each relay label according to the prescribed format; the two RFID systems poll the states of the relay tags at intervals, when the data to be received in the relay tags, the data are sequentially read and analyzed from the relay tags, and the read states are written into the relay tags for verification by a transmitting end. The method provided by the invention realizes communication between the ultrahigh frequency RFID systems, can meet the requirements of scenes with low requirements on communication delay and speed, 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 (radio frequency identification) inter-system communication method.
Background
In some application scenarios of large-scale open space, such as factories and warehouses, in order to improve the reading range and the reading efficiency of the ultrahigh frequency RFID systems, a plurality of ultrahigh frequency RFID systems are often deployed, and each ultrahigh frequency RFID system cooperatively works to complete the functions of industrial automation or automatic management of the warehouses. All the ultrahigh frequency RFID systems often need to communicate with each other to complete data exchange.
Common wired communication modes include serial communication and network communication, and common wireless communication modes include Bluetooth, WIFI, ZIGBEE, LORA and the like. It is naturally possible to use these communication methods to achieve communication between ultrahigh frequency RFID systems, but there are also some problems. On one hand, the wired communication mode is inconvenient to deploy in a scene that some RFID systems need to keep moving; on the other hand, various wired and wireless communication modes are added for the system, so that the system is required to be modified and integrated with related modules, and the cost and the complexity of the system are increased.
Because the ultrahigh frequency RFID system is a wireless communication system, if the characteristics can be used for realizing communication among the ultrahigh frequency RFID systems, 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 actual demand.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to provide a communication method between ultrahigh frequency RFID systems, so as to solve the problems that the conventional plurality of ultrahigh frequency RFID systems are inconvenient to deploy in a scene of needing to keep motion, and the cost and the complexity of the system are increased.
(II) technical scheme
In order to solve the technical problems, the invention provides an ultrahigh frequency RFID (radio frequency identification) inter-system communication method, which comprises the following steps:
s1, an ultrahigh frequency RFID system deployment step: the method comprises the steps of arranging an ultrahigh frequency RFID system and a plurality of RFID relay tags in a scene requiring communication; the relay tag is used as communication data transfer of two ultrahigh frequency RFID systems, and the data format and the read-write sequence of the relay tag are agreed in advance;
s2, data transmission: the ultrahigh frequency RFID system which needs to send data firstly counts the relay tags in the working range, determines that communication between the ultrahigh frequency RFID system and the relay tags is smooth, sequentially selects each relay tag according to a preset relay tag sequence, and writes data according to a preset data format;
s3, data receiving: the ultrahigh frequency RFID system reads the data of the relay tag, if the corresponding tag is found to be set, the data of the relay tag is read according to the agreed reading and writing sequence of the relay tag, and if the verification is passed, the tag of the relay tag is cleared; otherwise, the flag of the relay tag is set to be abnormal, and the data is retransmitted by the RFID ultrahigh frequency system for transmitting the data.
Further, in the step S1, an ultrahigh frequency RFID system includes an RFID reader/writer, RFID tags, and 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 stable read-write area is crossed between the two ultrahigh frequency RFID systems, and the relay tag is deployed in the stable read-write area common to the two ultrahigh frequency RFID systems.
Further, the LBT function of the two ultra-high frequency RFID systems is started, namely whether the operation is started or not is determined by detecting the occupation condition of the channels before the operation of the ultra-high frequency RFID systems.
Further, in the step S1, the numbers of the two ultrahigh frequency RFID systems and the numbers of the RFID relay tags need to be agreed, that is, the number information is bound with the tag data and integrated into the ultrahigh frequency RFID system.
Further, in the step S1, the data format of the relay tag needs to be agreed during deployment, and the 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 includes a "1- >2" flag, a "2- >1" flag, a bitlength field, a crc field, and a data field;
the setting of the 1- >2 flag indicates that the data stored in the relay tag is the data transmitted to the RFID ultrahigh frequency system 2 by the RFID ultrahigh frequency system 1 at present;
the setting of the 2- >1 flag indicates that the data stored in the relay tag is the data transmitted to the RFID ultrahigh frequency system 1 by the RFID ultrahigh frequency system 2 currently;
the bit field represents the bit number of the relay data stored in the current relay tag, and the RFID ultrahigh frequency system for receiving the data obtains the bit number of the effective data in the storage area from the bit field, namely, the length of the read data is determined;
the crc field represents a crc check value for the data stored in the relay tag, the crc check value being a check value for the entire relay data;
the data field is communication data of two ultrahigh frequency RFID systems.
Further, the ultrahigh frequency RFID system confirms whether data sent to the system is present or not by polling the two flag bits of the relay tag, and if so, a subsequent data receiving flow is carried out; both flag bits are set, and the communication abnormality is indicated; the data transmitting end checks two flag bits after the transmission is completed, and if the two flag bits are abnormal, a retransmission process is carried out; if the two flag bits are 0, the current relay tag is idle, and the sending end waits for writing communication data.
Further, the step S2 specifically includes: the data transmitting end performs one-round checking on the RFID tags in the reading range to determine the existence of each relay tag; sequentially writing the data into the storage areas of the relay labels according to the sequence 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 transmission is completed, the transmitting end polls and checks two flag bits of the relay tag No. 1, and if the two flag bits are 1, the transmitting end is abnormal and needs to retransmit.
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 finds that the zone bit is set, the data receiving end indicates that the data in the relay label is to be read, the data are sequentially read according to the agreed relay label data, and the data receiving end checks the data, and if the check is correct, the zone bit corresponding to the data receiving end is cleared; if the verification fails, setting two flag bits to indicate abnormal communication, and carrying out retransmission operation after the transmitting end detects the abnormality.
(III) beneficial effects
The invention provides a communication method between ultrahigh frequency RFID systems, which realizes communication between ultrahigh frequency RFID systems by designing a deployment mode and a communication data structure, can meet the requirements of scenes with low requirements on communication delay and speed, 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 an ultra-high frequency RFID system-to-system communication method deployment of the present invention;
FIG. 2 is a schematic diagram of a relay tag data format;
fig. 3 is a schematic flow chart of the method.
Detailed Description
To make the objects, contents and advantages of the present invention more apparent, the following detailed description of the present invention will be given with reference to the accompanying drawings and examples.
The invention discloses an ultrahigh frequency RFID system-to-system communication method. The method comprises the following steps: (1) an ultra-high frequency RFID system deployment step. Two ultra-high frequency RFID systems and RFID relay tags requiring wireless communication are deployed. (2) a data transmission step. The RFID system that needs to transmit data sequentially writes data in each relay tag according to a prescribed format. (3) a data receiving step. The two RFID systems poll the states of the relay tags at intervals, when the data to be received in the relay tags, the data are sequentially read and analyzed from the relay tags, and the read states are written into the relay tags for verification by a transmitting end.
The method provided by the invention realizes communication between the ultrahigh frequency RFID systems, can meet the requirements of scenes with low requirements on communication delay and speed, 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 ultrahigh frequency RFID systems under the same scene.
The method comprises the following steps:
s1, an ultrahigh frequency RFID system deployment step. The method comprises the steps of arranging an ultrahigh frequency RFID system and a plurality of RFID relay tags in a scene requiring communication; the relay tag is used as a communication data transfer of two ultrahigh frequency RFID systems, and the data format and the read-write sequence of the relay tag are agreed in advance.
S2, data transmission: the ultrahigh frequency RFID system which needs to send data firstly counts the relay tags in the working range, determines that communication between the ultrahigh frequency RFID system and the relay tags is smooth, sequentially selects the relay tags according to the relay tag sequence which is agreed in advance, and writes the data according to the agreed data format.
S3, data receiving: and the ultrahigh frequency RFID system reads the data of the relay tag, and if the corresponding flag is found to be set, the data of the relay tag is read out according to the agreed reading and writing sequence of the relay tag. If the verification is passed, the mark of the relay label is cleared; otherwise, the flag of the relay tag is set to be abnormal, and the data is retransmitted by the RFID ultrahigh frequency system for transmitting the data.
Example 1:
in order to implement the present invention, it is necessary to use LBT (listen before talk) function in the ultra-high frequency RFID system to scan whether co-channel interference exists in the channel before the RFID system occupies the channel.
The method comprises the following steps:
(1) And (3) an ultra-high frequency RFID system deployment step. An ultrahigh frequency RFID system is deployed in a scene requiring communication, and one ultrahigh frequency RFID system comprises an RFID reader-writer, an RFID tag and some RFID relay tags. The relay tag is used as communication data transfer of two ultrahigh frequency RFID systems, and the data format and the read-write sequence of the relay tag need to be agreed in advance.
In the implementation, two ultrahigh frequency RFID systems are deployed in a normal working environment where wireless communication is required, so that a stable reading and writing area crossing between the two ultrahigh frequency RFID systems is ensured. In order to avoid mutual interference in the operation of the two ultrahigh frequency RFID systems, the LBT function of the two ultrahigh frequency RFID systems is started, namely whether the operation is started or not is determined by detecting the occupation condition of a channel before the operation of the ultrahigh frequency RFID systems.
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 properly 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 are required to be agreed, namely, serial number information is bound with tag data and integrated into the ultrahigh frequency RFID systems.
When the system is deployed, the data format of the relay tag is required to be agreed, and a user area of the RFID tag can be selected as a storage area for storing communication data of two ultrahigh frequency RFID systems. The specific format of the data in the storage area is shown in fig. 2, and includes:
(11) The setting of the 1- >2 flag indicates that the data stored in the relay tag is the data transmitted to the RFID ultrahigh frequency system 2 by the RFID ultrahigh frequency system 1 at present;
(12) The setting of the "2- >1" flag indicates that the data stored in the relay tag is currently data transferred from the RFID uhf system 2 to the RFID uhf system 1.
The ultrahigh frequency RFID system can confirm whether the data sent to the system is present or not by polling the two flag bits of the relay tag, and if so, the system performs the subsequent data receiving flow. Both flag bits are set, indicating communication anomalies. After the data transmission end completes the transmission, the data transmission end can check two flag bits, and if the two flag bits are abnormal, the data transmission end carries out a retransmission flow. If the two flag bits are 0, the current relay tag is idle, and the sending end waits for writing communication data.
(13) The bit length field represents the bit number of the relay data stored by the current relay tag, and the RFID ultrahigh frequency system for 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 the crc check of the data stored in the relay tag, and in order to avoid the situation of data error in the transmission process, the crc check protection relay data is set, and the check value is the check value of the whole relay data.
(15) The data field is communication data of two ultrahigh frequency RFID systems.
Data transmission step S2: the data transmitting end performs one-round checking on the RFID tags in the reading range to determine the existence of each relay tag. And sequentially writing the data into the storage areas of the relay tags according to the sequence of the relay tag 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 transmission is completed, the transmitting end polls and checks two flag bits of the relay tag No. 1, and if the two flag bits are 1, the transmitting end is abnormal and needs to retransmit.
Data receiving 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 finds that the zone bit is set, the data receiving end indicates that the data in the relay label is to be read, the data are sequentially read according to the agreed relay label data, and the data receiving end checks the data, and if the check is correct, the zone bit corresponding to the data receiving end is cleared; if the verification fails, setting two flag bits to indicate abnormal communication, and carrying out retransmission operation after the transmitting end detects the abnormality.
The method provided by the invention realizes communication between the ultrahigh frequency RFID systems, can meet the requirements of scenes with low requirements on communication delay and speed, has the characteristics of low cost and simple realization, and is convenient to integrate into the existing RFID systems.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (4)
1. A method of ultra-high frequency RFID inter-system communication, the method comprising the steps of:
s1, an ultrahigh frequency RFID system deployment step: an ultrahigh frequency RFID system is deployed in a scene requiring communication, wherein one ultrahigh frequency RFID system comprises an RFID reader-writer, RFID tags and a plurality of RFID relay tags, the relay tags are used as communication data of two ultrahigh frequency RFID systems for transferring, and the data format and the reading and writing sequence of the relay tags are agreed in advance;
s2, data transmission: the ultrahigh frequency RFID system which needs to send data firstly counts the relay tags in the working range, determines that communication between the ultrahigh frequency RFID system and the relay tags is smooth, sequentially selects each relay tag according to a preset relay tag sequence, and writes data according to a preset data format;
s3, data receiving: the ultrahigh frequency RFID system reads the data of the relay tag, if the corresponding flag bit is found to be set, the data of the relay tag is read according to the agreed reading and writing sequence of the relay tag, and if the check is passed, the flag bit of the relay tag is cleared; otherwise, setting the flag bit of the relay tag as abnormal, and retransmitting the data by the ultrahigh frequency RFID system for transmitting the data;
in the step S1, two ultrahigh frequency RFID systems are deployed in a normal working environment in which wireless communication is required, so that a stable read-write area crossing the two ultrahigh frequency RFID systems is ensured, and a relay tag is deployed in the stable read-write area common to the two ultrahigh frequency RFID systems;
starting LBT functions of the two ultra-high frequency RFID systems, namely detecting occupation conditions of channels before the ultra-high frequency RFID systems work, and determining whether to start working or not;
in the step S1, the numbers of the two ultrahigh frequency RFID systems and the numbers of the RFID relay tags are required to be agreed, that is, the number information of the relay tags is bound with the tag data and integrated into the ultrahigh frequency RFID system;
in the step S1, when the system is deployed, a data format of a relay tag needs to be agreed, and a user area of an RFID tag is selected as a storage area for storing communication data of two ultrahigh frequency RFID systems;
the step S2 specifically includes: the data transmitting end performs one-round checking on the RFID tags in the reading range to determine the existence of each relay tag; sequentially writing the data into the storage areas of the relay labels according to the serial numbers of the relay labels and the 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 transmission is completed, the transmitting end polls and checks two flag bits of the relay tag, and if the two flag bits are 1, the transmitting end is abnormal and needs to retransmit.
2. The ultrahigh frequency RFID intersystem communication method of claim 1, wherein the data format includes a "1- >2" flag bit, a "2- >1" flag bit, a bit length field, a crc field, and a data field;
the flag bit of 1- >2 indicates that the data stored in the relay tag is the data transmitted from the ultrahigh frequency RFID system 1 to the ultrahigh frequency RFID system 2 currently;
the flag bit of 2- >1 indicates that the data stored in the relay tag is the data transmitted to the ultrahigh frequency RFID system 1 by the ultrahigh frequency RFID system 2 at present;
the bit length field represents the bit number of the relay data stored in the current relay tag, and the ultrahigh frequency RFID system for receiving the data obtains the bit number of the effective data in the storage area from the bit length, namely, the length of the read data is determined;
the crc field represents a crc check value for the data stored in the relay tag, the crc check value being a check value for the entire relay data;
the data field is communication data of two ultrahigh frequency RFID systems.
3. The method for communication between ultrahigh frequency RFID systems according to claim 2, wherein the ultrahigh frequency RFID system confirms whether there is data currently transmitted to itself by polling the two flag bits of the relay tag, and if so, performs the subsequent data reception flow; both flag bits are set, and the communication abnormality is indicated; the data transmitting end checks two flag bits after the transmission is completed, and if the two flag bits are abnormal, a retransmission process is carried out; if the two flag bits are 0, the current relay tag is idle, and the sending end waits for writing communication data.
4. The method for communication between ultrahigh frequency RFID systems according to claim 1, wherein the step S3 specifically comprises: the data receiving end polls the flag bit in the relay tag, if the flag bit corresponding to the data receiving end finds that the flag bit is set, the data in the relay tag is ready to be read, the data are sequentially read according to the agreed relay tag data, verification is carried out, and if the verification is correct, the flag bit corresponding to the data receiving end is cleared; if the verification fails, setting two flag bits to indicate abnormal communication, and carrying out retransmission operation after the transmitting end detects the abnormality.
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| JP4281800B2 (en) * | 2004-09-30 | 2009-06-17 | ブラザー工業株式会社 | Wireless tag communication device, wireless tag, wireless communication system, and wireless communication method |
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| KR20100128880A (en) * | 2009-05-29 | 2010-12-08 | 인하대학교 산학협력단 | Active radio frequency identification multi hop relay system and tags recognition method |
| CN113300758A (en) * | 2014-08-27 | 2021-08-24 | 弗劳恩霍夫应用研究促进协会 | Controller for SUDA system |
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