An RFID multi-tag identification anti-collision method
An RFID tag and anti-collision technology, which is applied in the field of RFID tag identification and anti-collision, can solve the problems that the reader cannot be obtained normally, the channel transmission signal collides, etc., and achieve the effect of improving communication efficiency, improving efficiency and saving energy.
Inactive Publication Date: 2015-09-30
SHANGHAI MARITIME UNIVERSITY
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Problems solved by technology
[0006] In view of the problems existing in the above-mentioned existing RFID multi-tag identification anti-collision method, the problem to be solved by the present invention is how to solve the problem of how to solve the problem of transmission signal collision in the channel when multiple tags in the RFID system send data to the reader at the same time. The problem that the reader cannot obtain the tag information normally
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[0024] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.
[0025] The present invention adopts the label packet transmission form based on the spatial position, and links the label identification with the spatial position of the label, and the specific method is as follows:
[0026] 1. According to the RSSI (Radio Signal Strength Indicator) index of the communication between the RFID tag and the reader, the sensing range of the reader is divided into areas to form multiple different sensing areas. Each sensing area The covered RFID tags form corresponding tag groups (such as figure 1 shown).
[0027] see figure 1 , since the greater the distance between the reader and the RFID tag, the greater the attenuation of the signal, so the closer to the reader the greater the RSSI value, and the farther away f...
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The invention discloses an anti-collision method for identifying multiple radio frequency identification (RFID) tabs, which is characterized in that according to the index of a radio signal strength indicator (RSSI) communicating between the RFID tabs and a reader, regional division is performed on the induction range of the reader to form a plurality of different induction areas; the RFID tabs covered by each induction area form a corresponding tab group; and moreover, data are transmitted by the RFID tabs in different tab groups at different time ranges, whereas data transmission is realized between the RFID tabs in the same one group and the reader by adopting a conventional anti-collision algorithm. The problem that normal communication cannot be realized because signal collision is generated in the communication process of a great number of tabs and the reader can be effectively solved, the identification efficiency under such the condition is greatly increased, and the misreading rate can be effectively reduced. The reader is higher in reading efficiency and communication stability when reading the information of a great amount of tabs.
Description
technical field [0001] The invention relates to wireless radio frequency technology, in particular to an RFID tag identification anti-collision method. Background technique [0002] Radio Frequency Identification (RFID) technology is a non-contact automatic identification technology, which automatically identifies target objects and obtains relevant information through radio frequency signals, and is an important supporting technology for the Internet of Things. With the deepening of retail and logistics information, RFID technology has been widely used in the industry to control inventory, improve supply chain management, reduce costs, and improve work efficiency. RFID is regarded as a bridge connecting the real physical world and the computer world, and has become an important technical means to realize ubiquitous computing. [0003] Logistics, warehousing and multi-label positioning systems widely involve readers reading information on multiple labels, such as: informati...
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IPC IPC(8): G06K7/00
Inventor 张颖朱大奇杨臻詹浩陆丽詹冉李俊甫赵碧茹方敏
Owner SHANGHAI MARITIME UNIVERSITY