A method of judging the end of stocktaking

Abstract

The invention discloses a method for judging the end of the checking up. The method is characterized by including that a reader sets a threshold value Smax, sends start query commands, and then waits to send response data packets in prescribed slot time; the reader checking up multiple labels based on dynamic dispersion shrinkage anti-collision methods, and adjusts the Smax value; and if the Smax value is adjusted to be 0, whatever the number of the labels is, the reader judges the end of the checking up. According to the method for judging the end of the checking up, the checking up can be ended timely, so that the anti-collision throughput rate can be maintained at a higher level.

Description

technical field [0001] The invention belongs to the technical field of radio frequency communication, and in particular relates to a method for a reader / writer to judge the end of stocktaking when multi-label identification is performed in a radio frequency identification system. Background technique [0002] Radio Frequency Identification (RFID) communication technology is a non-contact automatic identification technology. In the RFID system, the reader communicates with several tags through radio frequency signals, and obtains the identification information stored on each tag. [0003] A common problem faced by radio frequency identification systems and other typical radio frequency communication systems is that it needs to solve the collision problem of simultaneous communication between multiple devices in the same system. For the radio frequency identification system, it mainly solves the collision problem of communication between a single reader and multiple tags. An...

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Problems solved by technology

[0003] A common problem faced by radio frequency identification systems and other typical radio frequency communication systems is that it is necessary to solve the collision problem of simultaneous communication between multiple devices in the same system

[0015] In the above method of judging the end of the inventory, the selection of the continuous idle threshold CIT has a great impact on the anti-collision throughput rate of the system. If the value of CIT is small, it is necessary to send the start query command frequently. If the value of CIT is large, It also leads to the inability to end the inventory in time, and both cases will cause a decline in the anti-collision throughput rate

Especially when the number of tags is small, but the value of CIT is large, the anti-collision throughput rate will drop sharply

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