A reader-writer anti-collision method for radio frequency identification system

Abstract

The invention discloses a reader-writer anti-collision method used for a radio frequency identification (RFID) system. The reader-writer anti-collision method used for the RFID system mainly includes the following steps that before a reader-writer reads and writes a tag, the reader-writer sends broadcast information to other surrounding reader-writers through control channels first; the reader-writers receiving the broadcast information send read-write state information or waiting state information to other reader-writers according to working states of the reader-writers receiving the broadcast information; the reader-writers after transmitting the broadcast information adopt any corresponding operation of entering read-write states, entering waiting states, carrying out power adjustment and adopting back-off according to different pieces of received state information . The reader-writer anti-collision method used for the RFID system can overcome the defects of large resource consumption, complex operational processes, high cost, low working efficiency and the like in the prior art to achieve the advantages of small resource consumption, concise operational processes, low cost and high working efficiency.

Description

technical field [0001] The invention relates to the technical field of radio frequency identification, in particular to an anti-collision method for a reader / writer used in a radio frequency identification system. Background technique [0002] Radio Frequency Identification (RFID) technology is a non-contact automatic identification technology realized by radio frequency communication. RFID tags have the characteristics of long life, reusability, small size, and large capacity. Its system has application features that can support multi-target identification, non-visual identification, fast reading and writing, positioning, and long-term tracking management. [0003] With the popularization and application of RFID technology, the RFID system is gradually developing in the direction of intensive, mobile and energy-saving. In many occasions of RFID applications, it is necessary to deploy multiple RFID readers at the same time, and in order to prevent the missing reading of tag...

AI Technical Summary

Problems solved by technology

The scheduling-based anti-collision algorithm avoids collisions by preventing the reader from sending signals to the tags at the same time. It has always been the mainstream of the anti-collision algorithm. network-wide control structure

The anti-collision algorithm based on the effective range reduces the collision between the readers by reducing the overlapping area between the readers. Disadvantages: the control algorithms for adjusting the power of the readers are mostly complicated and costly; Collisions are minimized, but not eliminated

[0007] In the process of realizing the present invention, the inventor found that there are at least some defects in the prior art, such as large resource consumption, complicated operation process, high cost and low work efficiency.

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