Method and apparatus for providing energy to passive label in radio frequency recognition system
A radio frequency identification system and passive technology, applied in the field of radio frequency identification, can solve problems such as restricting the application of radio frequency identification systems, and achieve the effects of avoiding interference, improving reliability, and expanding read-only range and/or readable and writable range.
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no. 1 example
[0036] The first embodiment of the present invention increases the energy supplied to the tag by increasing the power intensity of the carrier wave transmitted by the reader.
[0037] Combine the following figure 2 The process of the first embodiment will be described in detail. figure 2 It shows an example of a process in which a reader / writer performs a write operation on a tag after performing a read operation, and the example is based on the EPCC1G2 protocol. After the reader / writer performs a read operation on a group of tags (for example, at time 1), the successfully read tags are in an acknowledged state. At this point, the reader sends a Req_RN command to a tag in the acknowledgment state. The tag generates and stores a new RN16, or handle (handle), returns the handle to the reader through backscatter, and turns to the open (open) or secure (secured) state (for example, at time 2) . The reader then issues a Req_RN command with RN16, and the tag returns a code val...
no. 2 example
[0058] The second embodiment of the present invention increases the energy supplied to the tag by prolonging the time of the carrier wave sent by the reader / writer. combine here Image 6 The second embodiment will be described in detail with the procedure shown. Image 6 The process shown is the same as figure 2 The processes shown are basically the same, and will not be repeated here. They differ in that the period t 2 The transmission power and transmission time length of the medium carrier.
[0059]As mentioned above, the reader / writer sends a command signal and a carrier wave (CW) signal during communication, and the tag obtains energy from the signal sent by the reader / writer. In this embodiment, increasing the time length for the reader to send the carrier wave to the tag can increase the energy obtained by the passive tag accordingly, thereby expanding the readable and writable range. Specifically, it can be that the reader / writer starts from those periods when th...
no. 3 example
[0071] The third embodiment of the present invention increases the energy supply to the tag by adding an independent energy supply device in the radio frequency identification system using the passive tag. The main idea is to set at least one independent energy supply device in the radio frequency identification system using passive tags, and the independent energy supply device sends a certain length of carrier signal to the tag during the communication of the radio frequency identification system, thereby additionally providing the tag with energy. The carrier signal sent by the independent energy supply device should comply with the maximum allowable sending power defined by relevant radio regulations.
[0072] As mentioned above, the reader / writer will send a command signal and a carrier wave (CW) signal during communication, and the tag obtains energy from the signal sent by the reader / writer, especially the carrier signal. In order to avoid interference to the communica...
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