RFID multi-label identification anti-collision method
An identification method and anti-collision technology, applied in the field of RFID radio frequency identification, can solve problems such as the inability to complete the complete identification of a large number of tags, reduce system communication complexity and system energy consumption, eliminate empty time slots or empty search states, and improve search The effect of efficiency
Inactive Publication Date: 2015-04-15
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology
[0009] What the present invention aims to solve is the technical problem that a large number of labels cannot be completely identified in a short period of time by the traditional method of identifying labels
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[0044] like Figure 1 to Figure 4 As shown, the RFID multi-tag identification anti-collision method disclosed in the present invention is suitable for a radio frequency identification system composed of a single reader and multiple tags. The new prefix in this method is directly generated according to the collision, and the prefix pool adopts stack storage. form, the specific steps of its identification method are as follows:
[0045] S10, complete the initialization of the system, initialize the prefix pool as an empty string, and set the label number to be empty;
[0046] S20, the reader uses an empty string as a prefix parameter, that is, the search prefix prefix=NULL, and sends a query command to the tags to be identified in the area;
[0047] S30, the reader receives the response from the tag. If there is no tag response, it means that there is no tag to be identified, and the identification ends; if there is a response, the tag that responds will feed back its own numbe...
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The invention discloses an RFID (Radio Frequency Identification Device) multi-label identification anti-collision method which comprises the following steps: reading a search prefix from a prefix pool by a reader, sending an identification request command to a label to be identified, and receiving the response of the label; comparing the prefix with the number of the label by the label, and making a response to the reader according to a comparison result; if no response is received, showing that no label to be identified exists; if the response is received and no collision occurs, showing that one label is successfully identified by the reader; if collision occurs in a received number string, recording the first collision bit as Dc, generating two new search prefixes, setting the values of the last bits, namely the collision bits Dc, of the new search prefixes as 0 or 1 respectively, putting the new search prefixes into the prefix pool, and repeating the process until the identification of all labels is finished. According to the method, the identification efficiency exceeds 50%, and the identification performance is stable and cannot be influenced by label number distribution; the method is suitable for various RFID multi-label identification occasions and RFID application systems.
Description
technical field [0001] The invention relates to the technical field of RFID radio frequency identification in the Internet of Things, in particular to an RFID multi-label identification anti-collision method. Background technique [0002] Radio Frequency Identification (RFID) is an automatic identification technology with the characteristics of real-time, fast and accurate collection. The RFID system is mainly composed of three parts: the reader (Reader), the tag (Tag) and the application system. The reader and the tag use a wireless channel for communication. Tags can be divided into active tags and passive tags. Passive tags are widely used because of their simple structure, low cost and small size. Passive tags are passive devices, and the tags will respond immediately after receiving instructions from the reader, sending their own label or data information. However, when multiple tags respond to a reader in the same channel at the same time, the tag data will interfere...
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Inventor 贾小林冯全源
Owner SOUTHWEAT UNIV OF SCI & TECH