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RFID tag anti-collision method

An RFID tag anti-collision technology, applied in the field of RFID tag anti-collision, can solve the problems of bandwidth resources, cost increase, time slot waste, etc., and achieve the effect of efficient use of time slots, high signal accuracy, and software program optimization

Pending Publication Date: 2019-11-05
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

[0004] The current anti-collision scheme mainly adopts the space division multiplexing method (SDMA) and the time slot algorithm-frame slot algorithm (FSA). The writer uses a phased array antenna to align the directional diagram of the antenna with a separate tag, and the tags are distinguished according to their angular positions within the range of the reader. This method has a complex antenna system and will greatly improve cost
When the time slot algorithm-frame slot algorithm (FSA) is used, when the number of tags is much larger than the number of time slots, the time to read the tags will be greatly increased; when the number of tags is much smaller than the number of time slots, it will cause time The gap is wasted, the stability of signal transmission and reception is slightly low, and bandwidth resources cannot be effectively used

Method used

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Embodiment Construction

[0016] based on the following Figure 3 ~ Figure 5 , specifically explain the preferred embodiment of the present invention.

[0017] An RFID system includes a card reader and n passive tags, and each tag t∈{0,...n-1} has a unique ID serial number t ID ∈{0,1 K}, K is the length of the ID sequence.

[0018] Such as image 3 As shown, the present invention provides a kind of RFID tag anti-collision method, comprises the following steps:

[0019] Step S0, the reader broadcasts a tag identification request, and the tags that receive the tag identification request arbitrarily select a time slot to transmit their respective ID serial numbers to the reader;

[0020] Step S1, after the reader / writer recognizes the ID serial number of the tag, reads the tag data;

[0021] Step S2. The reader judges whether the tag data received in the same time slot is single. If yes, it means that the obtained data is a single tag data, and proceed to step S4. If not, it means that multiple tag d...

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Abstract

The invention discloses an RFID tag anti-collision method. A reader-writer judges whether the label data received in the same time slot is single or not. If multi-label data collision occurs in the same time slot; and if the multi-label data collision occurs again, the reader-writer receives the collided label data by adopting the new time slot again, judges whether the received label data in thesame time slot is single again, receives the collided label data by adopting the new time slot again if the multi-label data collision occurs again, and so on until the multi-label data collision doesnot occur any more. The method is good in signal receiving and transmitting stability and high in signal correctness, existing network bandwidth resources are fully utilized, time slots are efficiently utilized, soft programs are optimized, and cost is saved.

Description

technical field [0001] The invention relates to an anti-collision method for RFID tags. Background technique [0002] In the RFID data transmission and processing system, the reader receives and reads the data by receiving the radio waves sent by the tag. The most common is the passive radio frequency system. When the reader meets the RFID tag, it emits electromagnetic waves and forms an electromagnetic field around it. The tag obtains energy from the electromagnetic field to activate the microchip circuit in the tag. The chip converts the electromagnetic wave and then sends it to the reader. The writer converts it into relevant data, which can then be processed by the control calculator for administrative control. [0003] The current anti-interference problem can be optimized to the greatest extent from the equipment material medium. Good anti-interference materials can improve the quality of information transmission, data transmission, and information reception. The act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10
CPCG06K7/10029
Inventor 陆志浩戴缘生吴欣烨肖烨辉
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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