Method and device for checking tag, and container

Abstract

The invention provides a method and a device for checking tags, and a container. The method comprises: receiving information of the tags scanned by each antenna in n antennas in a first sub-round in the space according to power selected from a power set; storing the information of the label scanned by the first sub-round in the current round; determining a set of labels which are not scanned whenthe first sub-round is compared with the previous round corresponding to the current round; acquiring a wireless parameter corresponding to each label in the stored label set; receiving label information obtained by scanning each label in the label set for a second sub-round of the current round according to the wireless parameter corresponding to each label in the label set; storing the information of the label scanned by the second sub-round of the current round; and summarizing the information of the label scanned in the first sub-round and the information of the label scanned in the secondsub-round as the information of the label scanned in the current round. The checking accuracy is improved and the order error rate is reduced.

Description

technical field [0001] The invention relates to the field of data communication, in particular to a method, device and container for inventorying tags. Background technique [0002] RFID (Radio Frequency Identification) is a wireless communication technology that can identify specific targets and read and write related data through radio signals. Common UHF-RFID systems that follow the ISO18000-6C protocol (such as figure 1 As shown) consists of tags, antennas (antenna 1 and antenna 2), readers, host computers, and background servers. The reader is connected to the host computer through the RS232 bus, and the host computer and the background server are connected through 4G (fourth generation Mobile communication technology) LTE (Long Term Evolution, long-term evolution) connection: [0003] RFID tags are usually passive (no battery power supply, etc.), and directly obtain energy from the electromagnetic field emitted by the RFID reader antenna. The RFID tag memory contains...

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Problems solved by technology

[0018] This method can solve part of the problem of "limited downlink" (signal limitation from the reader to the tag direction), but since the UHF-RFID tag is passive, its communication requires the use of electromagnetic waves emitted by the reader antenna to collect energy, so when the tag When communicating with the reader, in fact, the high-power carrier always exists, which will inevitably increase the difficulty of demodulation of the "uplink signal" (the direction from the tag to the reader) (the signal transmitted by the tag needs to be extracted from the superimposed carrier, which can be simply It is understood that the noise floor of demodulation becomes higher), so that some tags still cannot be counted

In addition, some tags with weak signals can only be inventoried at a specific frequency, and the frequency used by the underlying protocol is always changing during the inventory process (that is, using a frequency hopping mechanism), so only increasing the transmit power to inventory weak signals Label packaging has not improved

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