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CN-115843363-B - Communication method

CN115843363BCN 115843363 BCN115843363 BCN 115843363BCN-115843363-B

Abstract

A communication method includes a carrier sense step (S10) for executing carrier sense for each predetermined period, a transmission step (S11) for transmitting 1 st data including ID information of a wireless electronic tag of the communication device to a wireless access point when a signal transmitted from another wireless electronic tag to the wireless access point is not detected during execution of carrier sense and when the signal is not transmitted to the wireless access point in a stopped state, a command interpretation step (S12) for detecting a signal during execution of carrier sense and for interpreting a command included in the detected signal as a signal transmitted from the wireless access point when the signal is not transmitted from another wireless electronic tag to the wireless access point, and a frequency modification step (S13) for modifying a wireless frequency of a signal transmitted from the wireless electronic tag of the communication device when the command for instructing frequency modification is included in the signal.

Inventors

  • NAGAO AKIFUMI
  • Pu Yuangonggui

Assignees

  • 株式会社索思未来

Dates

Publication Date
20260505
Application Date
20210720
Priority Date
20200804

Claims (9)

  1. 1. A communication method is a communication method performed by one of a plurality of radio tags in a communication system composed of a radio access point and the plurality of radio tags, The communication method comprises the following steps: a carrier sense step of performing carrier sense for each predetermined period; A transmission step of transmitting, to the wireless access point, 1 st data including ID information that is information for uniquely identifying the one wireless tag, in a case where a signal transmitted to the wireless access point by a wireless tag different from the one wireless tag is not detected in the execution of the carrier sense, and in a case where the transmission stop state is not detected; an instruction interpretation step of detecting a signal in the execution of the carrier sense and interpreting an instruction included in a signal transmitted from the wireless access point as a signal transmitted from the wireless access point in a case where the signal is not a signal transmitted from a wireless electronic tag different from the one wireless electronic tag to the wireless access point, and A frequency changing step of changing a radio frequency of a signal transmitted by the one radio frequency tag in a case where the instruction for instructing to change the frequency is included in the signal in the instruction interpretation step, In the step of transmitting, the data is transmitted, In the case where the instruction interpretation step interprets that an instruction for instructing to stop transmission and change frequency is included in the signal, and in the case where a signal transmitted to the wireless access point by the different wireless electronic tag is not detected in the execution of the carrier sense, data 2 is transmitted to the wireless access point, the data 2 being data to which information showing that the instruction was received is added in the data 1, In the step of changing the frequency of the signal, When the instruction interpretation step interprets that the instruction for instructing to stop transmission and change the frequency is included in the signal, after the 2 nd data is transmitted, the radio frequency of the signal transmitted by the one radio frequency tag is changed, The communication method further includes a control step of stopping only the execution of the transmission step after the 2 nd data is transmitted in the transmission step until an instruction for instructing to start transmission again is included in the signal transmitted from the wireless access point detected in the execution of the carrier sense by the instruction interpretation step.
  2. 2. A communication method is a communication method performed by one of a plurality of radio tags in a communication system composed of a radio access point and the plurality of radio tags, The communication method comprises the following steps: a carrier sense step of performing carrier sense for each predetermined period; A transmission step of transmitting, to the wireless access point, 1 st data including ID information that is information for uniquely identifying the one wireless tag, in a case where a signal transmitted to the wireless access point by a wireless tag different from the one wireless tag is not detected in the execution of the carrier sense, and in a case where the transmission stop state is not detected; an instruction interpretation step of detecting a signal in the execution of the carrier sense and interpreting an instruction included in a signal transmitted from the wireless access point as a signal transmitted from the wireless access point in a case where the signal is not a signal transmitted from a wireless electronic tag different from the one wireless electronic tag to the wireless access point, and A frequency changing step of changing a radio frequency of a signal transmitted by the one radio frequency tag in a case where the instruction for instructing to change the frequency is included in the signal in the instruction interpretation step, In the step of transmitting, the data is transmitted, In the case where the instruction interpretation step interprets that an instruction for instructing to stop transmission is included in the signal, and in the case where a signal transmitted to the wireless access point by the different wireless electronic tag is not detected in the execution of the carrier sense, data 2 is transmitted to the wireless access point, the data 2 being data to which information showing that the instruction was received is added in the data 1, The communication method further includes a control step in which, after the 2 nd data is transmitted in the transmission step, only execution of the transmission step is stopped.
  3. 3. The communication method according to claim 2, In the step of changing the frequency of the signal, When the instruction interpretation step interprets that the instruction for instructing to change the frequency is included in the signal, the radio frequency of the signal transmitted by the one radio frequency tag is changed, In the control step, when the radio frequency of the signal transmitted by the one radio tag is changed in the frequency changing step, execution of the transmitting step is restarted.
  4. 4. The communication method according to claim 1 or 2, The information showing that the instruction is received is an ACK message, ACK.
  5. 5. A communication method is a communication method performed by one of a plurality of radio tags in a communication system composed of a radio access point and the plurality of radio tags, The communication method comprises the following steps: a carrier sense step of performing carrier sense for each predetermined period; A transmission step of transmitting, to the wireless access point, 1 st data including ID information that is information for uniquely identifying the one wireless tag, in a case where a signal transmitted to the wireless access point by a wireless tag different from the one wireless tag is not detected in the execution of the carrier sense, and in a case where the transmission stop state is not detected; an instruction interpretation step of detecting a signal in the execution of the carrier sense and interpreting an instruction included in a signal transmitted from the wireless access point as a signal transmitted from the wireless access point in a case where the signal is not a signal transmitted from a wireless electronic tag different from the one wireless electronic tag to the wireless access point, and A frequency changing step of changing a radio frequency of a signal transmitted by the one radio frequency tag in a case where the instruction for instructing to change the frequency is included in the signal in the instruction interpretation step, The carrier sensing step includes the steps of: a strength calculation step of calculating the strength of a signal received during the execution of the carrier sense; A1 st detection step of determining that a signal transmitted to the wireless access point by a wireless tag different from the one wireless tag is detected in a period in which a1 st averaged intensity obtained by dividing and averaging the intensities calculated in the intensity calculation step in 1 st period, exceeds a1 st threshold, and A 2 nd detection step of determining that the detected signal is not a signal transmitted to the wireless access point by a wireless tag different from the one wireless tag by determining a pattern consisting of the number of 2 nd averaged intensities exceeding a 2 nd threshold and the number of 2 nd thresholds or less, the 2 nd averaged intensities being obtained by dividing the intensities calculated in the intensity calculation step by a 2 nd period shorter than the 1 st period and averaging the divided intensities.
  6. 6. The communication method according to claim 5, In the step of interpreting the instructions in question, An instruction included in a signal transmitted from the wireless access point is interpreted by a combination of the number of 2 nd averaged intensities constituting the pattern judged in the 2 nd detecting step exceeding a2 nd threshold and the number of 2 nd thresholds or less.
  7. 7. A communication method is a communication method performed by one of a plurality of radio tags in a communication system composed of a radio access point and the plurality of radio tags, The communication method comprises the following steps: a carrier sense step of performing carrier sense for each predetermined period; A transmission step of transmitting, to the wireless access point, 1 st data including ID information that is information for uniquely identifying the one wireless tag, in a case where a signal transmitted to the wireless access point by a wireless tag different from the one wireless tag is not detected in the execution of the carrier sense, and in a case where the transmission stop state is not detected; an instruction interpretation step of detecting a signal in the execution of the carrier sense and interpreting an instruction included in a signal transmitted from the wireless access point as a signal transmitted from the wireless access point in a case where the signal is not a signal transmitted from a wireless electronic tag different from the one wireless electronic tag to the wireless access point, and A frequency changing step of changing a radio frequency of a signal transmitted by the one radio frequency tag in a case where the instruction for instructing to change the frequency is included in the signal in the instruction interpretation step, In the carrier sensing step, the 1 st carrier sensing step and the 2nd carrier sensing step are alternately performed, The 1 st carrier sense step includes the steps of: a strength calculation step of calculating a strength of a signal received in the execution of the carrier sense, and A1 st detection step of determining that a signal transmitted to the wireless access point by a wireless tag different from the one wireless tag is detected during a period in which the 1 st averaged intensity obtained by dividing the intensity calculated in the intensity calculation step by a1 st period and averaging the divided intensities, The 2 nd carrier sense step includes the steps of: a strength calculation step of calculating a strength of a signal received in the execution of the carrier sense, and A 2 nd detection step of determining that the detected signal is not a signal transmitted to the wireless access point by a wireless tag different from the one wireless tag by determining a pattern consisting of the number of 2 nd averaged intensities exceeding a 2 nd threshold and the number of 2 nd thresholds or less, the 2 nd averaged intensities being obtained by dividing the intensities calculated in the intensity calculation step by a 2 nd period shorter than the 1 st period and averaging the divided intensities.
  8. 8. A communication method is carried out by a wireless access point in a communication system composed of the wireless access point and a plurality of wireless electronic tags, The communication method comprises the following steps: An ID information collection step of collecting ID information which is information uniquely identifying each of the plurality of radio frequency tags, A signal transmission step of broadcasting a signal including an instruction for instructing to change the 1 st frequency currently used by the plurality of radio frequency tags to the 2 nd frequency for each predetermined period, and A signal stopping step of stopping broadcasting of a signal including the instruction in a case where it is confirmed that information indicating reception of the instruction is received from each of the plurality of radio frequency tags, The communication method further includes: A step of recognizing that the plurality of radio frequency tags have started to move to the region by recognizing that the plurality of radio frequency tags move to the region where the 2 nd frequency is different from the 1 st frequency that the plurality of radio frequency tags now use, and A confirmation step of confirming entry of the plurality of radio tags into the area, In the step of transmitting the signal, the signal is transmitted, When the identification step identifies that the plurality of radio tags have started moving to the area, broadcasting a signal to the plurality of radio tags for each predetermined period, the signal including an instruction to change the 1 st frequency currently used by the plurality of radio tags to the 2 nd frequency and to stop transmission, Further, when the plurality of radio tags are confirmed to enter the area in the confirmation step, a signal including an instruction to start transmission again is broadcast to the plurality of radio tags for each predetermined period.
  9. 9. A communication method is carried out by a wireless access point in a communication system composed of the wireless access point and a plurality of wireless electronic tags, The communication method comprises the following steps: An ID information collection step of collecting ID information which is information uniquely identifying each of the plurality of radio frequency tags, A signal transmission step of broadcasting a signal including an instruction for instructing to change the 1 st frequency currently used by the plurality of radio frequency tags to the 2 nd frequency for each predetermined period, and A signal stopping step of stopping broadcasting of a signal including the instruction in a case where it is confirmed that information indicating reception of the instruction is received from each of the plurality of radio frequency tags, The communication method further includes: a step of recognizing that the plurality of radio tags have started to move to a region where the 2 nd frequency is required to be used, the 2 nd frequency being a frequency different from the 1 st frequency that the plurality of radio tags now use, and A confirmation step of confirming entry of the plurality of radio tags into the area, In a further step of the signal transmission, When it is recognized in the recognizing step that the plurality of radio tags have started moving toward the region, a signal including an instruction to stop transmission is broadcast to the plurality of radio tags for each predetermined period, When it is confirmed in the confirmation step that the plurality of radio frequency tags have entered the area, a signal including an instruction to change the 1 st frequency currently used by the plurality of radio frequency tags to the 2 nd frequency is broadcast to the plurality of radio frequency tags for each predetermined period.

Description

Communication method Technical Field The present disclosure relates to a communication method and a wireless electronic tag, and more particularly, to a communication method of an active wireless electronic tag, a communication method of a wireless access point that receives radio waves from an active wireless electronic tag, and an active wireless electronic tag. Background There is a wireless electronic tag that is attached to an article for tracking the location. The wireless electronic tag is also called an electronic tag, an IC (INTEGRATED CIRCUIT: integrated circuit) tag, a wireless IC tag, a noncontact IC tag, or an RFID (Radio Frequency Identification: radio frequency identification) tag. The wireless electronic tag is passive and active, wherein the passive is driven by electric power from an external device to emit radio waves, and the active is driven by a built-in battery to emit radio waves autonomously. For example, patent document 1 proposes a system capable of Tracking (Tracking) a container using an active wireless tag. Accordingly, patent document 1 discloses a system capable of performing wireless tracking in real time in a limited area where a limit is determined. (Prior art literature) (Patent literature) Patent document 1, japanese patent application laid-open No. 2004-529049 However, frequencies that can be used in active wireless electronic tags may vary from region to region. For example, the frequency that can be utilized in japan is 920MHz. The frequency available in China is 830MHz, for example, and the frequency available in Europe is 868MHz. And, the frequency that can be utilized in the united states is 915MHz. That is, when tracking is performed across areas where available frequencies in the radio frequency tag are different, the frequencies need to be changed. Further, since a radio tag used for tracking and the like is expensive in many cases, a relatively inexpensive radio tag having no means for receiving data is used. That is, there is a problem that the frequency to be initially set cannot be changed in the relatively inexpensive radio tag. Disclosure of Invention In view of the above-described circumstances, an object of the present disclosure is to provide a communication method and a wireless electronic tag capable of changing a frequency of an active wireless electronic tag that does not include a means for receiving data. The communication method in one aspect of the present disclosure is a communication method by one radio tag of a plurality of radio tags in a communication system configured by a radio access point and the plurality of radio tags, and the communication method includes a carrier sense step of performing carrier sense for each predetermined period, a transmission step of, in a case where a signal transmitted from a radio tag different from the one radio tag to the radio access point is not detected during the carrier sense, and in a case where a transmission stop state is not detected, transmitting 1 st data including ID information which is information for uniquely identifying the one radio tag to the radio access point, an instruction interpretation step of detecting a signal during the carrier sense, and in a case where the signal is not a signal transmitted from a radio tag different from the one radio tag to the radio access point, interpreting the detected signal as a signal transmitted from the radio access point, and in a case where an instruction for interpreting a frequency included in the signal transmitted from the radio access point is interpreted as a frequency included, and a frequency included in the instruction for interpreting the frequency included in the radio tag is changed. Accordingly, by utilizing the carrier sense function in the active radio tag that does not include a means for receiving data, the command transmitted by the radio access point can be interpreted, and the frequency used by the radio tag can be changed. Here, for example, in the transmitting step, when the instruction interpretation step interprets that an instruction for instructing to stop transmission and change a frequency is included in the signal, and when a signal transmitted to the wireless access point by the different wireless electronic tag is not detected in the execution of the carrier sense, the 2 nd data, which is data to which information showing that the instruction is received is added to the 1 st data, is transmitted to the wireless access point, and in the frequency changing step, when the instruction interpretation step interprets that an instruction for instructing to stop transmission and change a frequency is included in the signal, after the 2 nd data is transmitted, the wireless frequency of the signal transmitted by the one wireless electronic tag is changed, and in the controlling step, after the 2 nd data is transmitted in the transmitting step, until the instruction interpretation step interprets that the signal transmitted from