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Conflict prevention method for low-frequency activated active tags
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A label and low-frequency technology, which is applied in the field of radio frequency identification RFID, label identification system, and active label transmission data, can solve the problems that the label reader cannot recognize the label, the failure of label transmission data, and the failure of label data transmission and reception, etc., so as to improve label identification The effect of reducing the label recognition delay and shortening the label recognition delay
Active Publication Date: 2014-04-23
ZHEJIANG INSIGMA TECH
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[0003] However, no matter which of the above methods is used, since all tags share the same wireless channel, there are situations where multiple activated tags use the same channel to send and receive data at the same time, resulting in conflicts
Conflicts will cause tag data to fail to be sent and received
In a typical scenario, for example, the tag fails to send data, and the tag reader cannot recognize the tag
Method used
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Embodiment 1
[0053] figure 1 It is a system example diagram of a tag sending data provided by the present invention, including the activator
[0054] ACTIVATER, active tag TAG, reader READER, serverSERVER and network NETWORK.
[0055] ACTIVATER is preferably fixedly installed in appropriate places, such as building gates, entrance and exit gates in public places, conference centers, logistics warehouses, item sorting devices, etc. Of course, those skilled in the art can easily understand that it can also work in an appropriate way, such as using In the mobile vehicle environment, there is no limitation here. The number of ACTIVATERs can be one or more, and there is no limitation here. The ACTIVATER is used to periodically send a low-frequency activation signal LF, for example, a 125HZ wireless signal.
[0056] Active tags are often attached to people or objects and are movable. There are multiple active tags in many application scenarios. Of course, those skilled in the art can easily un...
Embodiment 2
[0097]For example, in an application scenario: BandWidth=2M bit / s; FrmLen=160bit, that is, 20Byte; TagNum=200; IdtfTime=1s;
[0098] According to the method mentioned above, the above parameters are substituted into the formula, and the following formula is obtained:
[0109] After removing the tail and adding 1 to round up:
[0110] TxNumBest=22;
[0111] PickRateBest=0.999999698060566;
[0112] image 3 An example of a tag identification case with TxNumBest=5 is given, where Activated indicates the moment when the tag is activated; IdtfTime indicates the...
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Abstract
The invention relates to an RFID (radio frequency identification) technology in the field of wireless communication, and particularly discloses a tag identification system and a data transmission method for active tags. Each active tag is dominant in most of time, and generates a random time sequence for data transmission by taking the own ID (identifier) and tag system time when the tag is activated as seeds after receiving a low-frequency activation signal, wherein each random time sequence comprises TxNumBest moment values for indicating TxNumBest starting moments when data of the same frame is repeatedly transmitted by the corresponding active tag. Each tag repeatedly transmits the same data frame for TxNumBest times according to the values of the time sequence, and can be successfully identified as long as the data frame transmitted at any time is successfully received by a reader, and in the period the reader is not required to give any feedback. The method is favorable for reducing the power consumption of the tags, reducing data transmission conflicts among the tags and increasing the tag identification rate.
Description
technical field [0001] The invention relates to radio frequency identification (RFID) technology in the field of wireless communication, in particular to a tag identification system and a method for sending data from an active tag. Background technique [0002] In order to solve the problem of power consumption and service life of the tag, on the one hand, the field integrates the battery into the tag to increase the energy storage of the tag; on the other hand, efforts are made to reduce the power consumption of the tag. method, the method for the data transmission of the low frequency activator to activate the tag, etc. In the method that the tag communicates regularly according to a fixed period, the tag generally has at least two states, namely sleep and activation. In this method, the tag wakes up from the sleep state and changes to the active state according to a fixed time period. After the data is sent and received, it enters the dormant state again. In the data tr...
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