WO2021217354A1 - Appareil de suivi, dispositif terminal, et procédé de suivi - Google Patents

Appareil de suivi, dispositif terminal, et procédé de suivi Download PDF

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Publication number
WO2021217354A1
WO2021217354A1 PCT/CN2020/087278 CN2020087278W WO2021217354A1 WO 2021217354 A1 WO2021217354 A1 WO 2021217354A1 CN 2020087278 W CN2020087278 W CN 2020087278W WO 2021217354 A1 WO2021217354 A1 WO 2021217354A1
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WIPO (PCT)
Prior art keywords
bluetooth
continuous wave
tracking device
tracking
broadcast signal
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PCT/CN2020/087278
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English (en)
Chinese (zh)
Inventor
邵帅
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to CN202080099266.XA priority Critical patent/CN115362697A/zh
Priority to PCT/CN2020/087278 priority patent/WO2021217354A1/fr
Publication of WO2021217354A1 publication Critical patent/WO2021217354A1/fr

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    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
    • G16H50/00—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics
    • G16H50/80—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics for detecting, monitoring or modelling epidemics or pandemics, e.g. flu
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of communications, in particular to a tracking device, terminal equipment and a tracking method.
  • Covid-19 coronavirus
  • Internationally renowned companies have joined the battle against the epidemic, trying to use technology to overcome the epidemic or slow the spread of the epidemic.
  • some companies have launched a contact tracking system for the Covid-19 virus.
  • the tracking system relies on Bluetooth Low Energy (BLE) technology to establish a contact tracking system.
  • BLE Bluetooth Low Energy
  • the tracking system can be applied to Apple (iOS) or Android (android) smart terminals.
  • iOS Apple
  • Android android
  • Beacon Bluetooth beacon
  • the aforementioned tracking system does not need to purchase hardware separately, because Bluetooth and Bluetooth BLE technology are widely integrated in smart terminals, and users only need to use existing smart terminals.
  • the communication distance of Bluetooth BLE technology is 10-100 meters, and the range is relatively large, which is not suitable for short-distance personnel tracking.
  • the Bluetooth BLE communication standard is complicated, transmission and reception need to be deployed according to the communication standard, and the underlying software implementation is complicated.
  • a Bluetooth device can connect up to 7 other devices at the same time. Therefore, the number of people using Bluetooth to track is limited. If there is a large-scale gathering at the same time, all participants cannot be tracked effectively.
  • the embodiments of the present invention provide a tracking device, terminal equipment, and tracking method, which are used for adopting backscattering technology, avoiding the bluetooth complex data exchange standard, and improving the efficiency of data extraction.
  • the first aspect of the embodiments of the present invention provides a tracking device, including: a backscattering device; the backscattering device is configured to receive a first continuous wave; according to the first continuous wave, reflect the first Bluetooth low power Consumes a broadcast signal, and the first Bluetooth low energy broadcast signal includes an identification of the tracking device.
  • the backscattering device includes: a processor, an oscillator, an encoder, and a first Bluetooth antenna, the processor is connected to the oscillator, and the oscillator Connected with the encoder, and the encoder is connected with the first Bluetooth antenna;
  • the processor is specifically configured to receive the first continuous wave through the first Bluetooth antenna; according to the first continuous wave, control the oscillator to switch a target frequency, and control the encoder to follow the target frequency Encoding is performed, and the first Bluetooth low energy broadcast signal is reflected through the first Bluetooth antenna.
  • the backscatter device further includes: a rectifier, and the rectifier is connected to the processor;
  • the rectifier is configured to obtain the first continuous wave, convert the first continuous wave into a direct current signal, and start the processor when the voltage of the direct current signal is higher than a preset threshold.
  • the tracking device further includes: a continuous wave CW device and a Bluetooth device, and the CW device is connected to the Bluetooth device and the backscatter device respectively;
  • the CW device is used to generate and send a second continuous wave
  • the Bluetooth device is also configured to receive a second Bluetooth low energy broadcast signal, the second Bluetooth low energy broadcast signal being a signal reflected by the first target tracking device according to the second continuous wave, the second Bluetooth The low-power broadcast signal includes the identification of the first target tracking device.
  • the CW device includes: a CW modem, a CW transmitter, and a CW antenna, the CW modem is connected to the CW transmitter, and the CW transmitter is connected to the CW antenna.
  • the CW modem is used to generate the second continuous wave
  • the CW transmitter is configured to transmit the second continuous wave through the CW antenna.
  • the Bluetooth device includes a Bluetooth receiver
  • the CW transmitter and the Bluetooth receiver are configured to be turned on within the first active scanning time period t1, and the t1 is within the working period T1 of the CW transmitter.
  • the backscattering device is further configured to generate the first Bluetooth low energy broadcast signal according to the first continuous wave; according to the first active scanning duration t1, Determine a first delay; reflect the first Bluetooth low energy broadcast signal according to the first delay; wherein, the first delay is less than the t1, and the t1 is within the working period T1 of the CW transmitter .
  • the tracking device further includes: a cellular radio frequency device and a Bluetooth device, and the cellular radio frequency device is connected to the Bluetooth device and the backscatter device respectively;
  • the cellular radio frequency device is used to generate and transmit a third continuous wave
  • the Bluetooth device is also used to receive a third Bluetooth low energy broadcast signal, the third Bluetooth low energy broadcast signal is a signal reflected by the second target tracking device according to the third continuous wave, the third Bluetooth The low-power broadcast signal includes the identification of the second target tracking device.
  • the cellular radio frequency device includes: a cellular modem, a cellular radio frequency front end, and a cellular antenna.
  • the cellular modem is connected to the cellular radio frequency front end, and the cellular radio frequency front end is connected to the cellular radio frequency front end.
  • Cellular antenna connection; the cellular modem is connected to the Bluetooth device and the backscatter device respectively;
  • the cellular modem is configured to generate the third continuous wave
  • the cellular radio frequency front end is configured to transmit the third continuous wave through the cellular antenna.
  • the Bluetooth device includes a Bluetooth receiver
  • the cellular radio frequency front end and the Bluetooth receiver are configured to be turned on during the second active scanning duration t2, and the t2 is within the working period T2 of the cellular radio frequency front end.
  • the backscattering device is further configured to generate the first Bluetooth low energy broadcast signal according to the first continuous wave; according to the second active scanning duration t2, Determine a second delay; reflect the first Bluetooth low energy broadcast signal according to the second delay; wherein, the second delay is less than the t2, and the t2 is within the working period T2 of the cellular radio frequency front end .
  • the tracking device further includes: a Bluetooth device, a switch, and a second Bluetooth antenna, and the switch is connected to the second Bluetooth antenna;
  • the Bluetooth device is configured to connect with the second Bluetooth antenna through the switch during the reflection period
  • the backscattering device is used to connect to the second Bluetooth antenna through the switch during a non-reflective period.
  • a second aspect of the embodiments of the present invention provides a terminal device, including the tracking device as described in the first aspect and any optional implementation manner of the first aspect of the present invention.
  • the third aspect of the embodiments of the present invention provides a tracking method, which is applied to the tracking device as described in the first aspect and any optional implementation of the first aspect of the present invention, or as the second aspect of the present invention.
  • the method includes: receiving a first continuous wave; according to the first continuous wave, reflecting a first Bluetooth low energy broadcast signal, the first Bluetooth low energy broadcast signal including the tracking device Of the logo.
  • a third aspect of the embodiments of the present invention provides a computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute the method according to the third aspect of the present invention.
  • the tracking device includes: a backscattering device; a backscattering device for receiving a first continuous wave; according to the first continuous wave, reflecting a first Bluetooth low energy broadcast signal ,
  • the first Bluetooth low energy broadcast signal includes the identification of the tracking device.
  • the backscatter technology is adopted to avoid the complex data exchange standard of Bluetooth and improve the efficiency of data extraction.
  • the first Bluetooth low energy broadcast signal includes the identification of the tracking device, and the identification of the tracking device can be used to determine the tracking device.
  • the use of the backscatter device to receive the first continuous wave and reflect the first Bluetooth low energy broadcast signal has no limit on the number of people, and it is also suitable for medium and short distance tracking.
  • FIG. 1 is a system architecture diagram of medium and short distance contact recording applied in an embodiment of the present invention
  • Figure 2 is a schematic diagram of an embodiment of a tracking device in an embodiment of the present invention.
  • 3A is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention.
  • 3B is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention.
  • 3C is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention.
  • 3D is a schematic diagram of the working period and active scanning duration of the CW transmitter inside the tracking device in the embodiment of the present invention
  • FIG. 3E is a schematic diagram of the backscatter time mechanism in an embodiment of the present invention.
  • FIG. 4A is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention.
  • FIG. 4B is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention.
  • 4C is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention.
  • FIG. 5A is a schematic diagram of an embodiment of a backscattering device in an embodiment of the present invention.
  • 5B is a schematic diagram of another embodiment of the backscattering device in the embodiment of the present invention.
  • 5C is a schematic diagram of another embodiment of the backscattering device in the embodiment of the present invention.
  • Fig. 6 is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention.
  • Figure 7 is a schematic diagram of an embodiment of a terminal device in an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of an embodiment of a tracking method in an embodiment of the present invention.
  • short-range tracking Compared with long-range tracking such as the Global Positioning System (GPS), short-range tracking has its own unique application points. For example, close-range tracking only obtains the information of the tracked object within a certain range. This approach firstly ensures information security and is not easy to be eavesdropped on.
  • the second tracked information contains the relative physical location.
  • the relative position of the tracking system is more important than the absolute position.
  • Bluetooth BLE is used to obtain the historical relative position of personnel.
  • personnel tracking in addition to specific technical applications, it is also necessary to consider the convenience of use, such as whether it is necessary to purchase hardware separately, and whether complex operations are required during use. The following is an overview of the pros and cons of some technologies in personnel tracking.
  • Ultra High Frequency (UHF) RFID technology is a wireless electronic tag tracking system created specifically for item tracking. This system requires at least one card reader and a large number of electronic tags attached to the surface of the article. At present, UHF RFID technology has not been integrated in a large number of smart terminals. As an item tracking, it is fast and has a large number of items that can be tracked. For example, the Impinj R420 card reader can read more than 1,000 electronic tags per second. Moreover, the reading distance is 5-10 meters, which is neither far nor near. However, this tracking method requires professional card readers, electronic tags, and additional hardware expenditures for ordinary consumers. Moreover, UHF RFID uses the Class 1 Gen 2 (ISO 18000-6C) label protocol, which has not been widely integrated with smart terminals, making it more difficult to develop terminals.
  • ISO 18000-6C Class 1 Gen 2
  • NFC Near Field Communication
  • smart terminals As personnel tracking, its advantages and disadvantages are: Advantages: 1. Strong security. 2. Extensive integration and intelligent terminals, no need for consumers to purchase special hardware. Disadvantages: wireless transmission distance is short, ⁇ 50cm, not suitable for medium-distance objects and personnel tracking.
  • the embodiment of the present invention proposes a tracking system for short-distance persons using backscatter technology, which may also be referred to as a tracking device for short.
  • the tracking device can be applied to terminal equipment to realize short- and medium-distance personnel tracking.
  • the tracking device does not require users to purchase special hardware, and directly uses terminal equipment.
  • the terminal equipment adopts the backscatter technology, which can quickly obtain the information of other terminal equipment within the specified range.
  • the tracking device can use the data structure specified by the Bluetooth BLE standard protocol for data exchange, reducing the research and development cost of terminal equipment, and is faster and more accurate in tracking range than the tracking system in the prior art.
  • the terminal equipment in the embodiments of the present invention may be referred to as user equipment (UE), mobile station (mobile station, MS), mobile terminal equipment (mobile terminal), smart terminal equipment, etc.
  • the terminal device can communicate with one or more core networks via a radio access network (RAN).
  • RAN radio access network
  • the terminal device can be a mobile phone (or called a "cellular" phone), a computer with a mobile terminal device, etc.
  • the terminal device can also be a portable, pocket-sized, handheld, computer built-in or vehicle-mounted mobile device, and future NR Terminal devices in the network, they exchange voice or data with the wireless access network.
  • the terminal equipment may also include a relay, and any data communication with the base station can be regarded as terminal equipment.
  • the terminal equipment includes the tracking device as an example for description.
  • the terminal device is used to transmit continuous wave (CW) to obtain the Bluetooth low energy broadcast (BLE Advertising, BLE advertising) signal reflected by other peripheral terminal devices to realize the record of the contact history between the terminal device and the terminal device.
  • BLE Advertising Bluetooth low energy broadcast
  • user 0 can be understood as a user using terminal device 0, and user 1, user 2, user 3...User N is similar.
  • the terminal device 0 initiates an inquiry request by transmitting a CW wave.
  • the peripheral terminal equipment receives the CW wave and uses the CW wave as a carrier wave to reflect the BLE advertising signal outward.
  • the BLE advertising signal transmitted by each terminal device has its unique identification information, and this unique identification information can be used to uniquely identify the terminal device of the user N.
  • the terminal device 0 receives the BLE information, which are BLE1, BLE2...BLE N, and records the BLE information in the terminal device 0.
  • the terminal device in the embodiment of the present invention has the dual functions of a card reader and an electronic tag.
  • the terminal device 0 that transmits the CW wave has no right to rewrite the information content in BLE1, BLE2...BLE N, that is, the BLE information content is only provided by the terminal device that is performing backscattering.
  • the tracking device includes: a backscattering device 201; a backscattering device 201 for receiving a first continuous wave; according to the first continuous wave, reflecting a first Bluetooth low energy broadcast signal, the first Bluetooth low power
  • the consumption broadcast signal includes the identification of the tracking device.
  • the tracking device includes the backscattering device 201, that is, the backscattering technology is adopted, which avoids the complex data exchange standard of Bluetooth and improves the efficiency of data extraction.
  • the first Bluetooth low energy broadcast signal includes the identification of the tracking device. The identification of the tracking device can be used to identify the tracking device.
  • the use of the backscattering device 201 to receive the first continuous wave and reflect the first Bluetooth low energy broadcast signal has no limitation on the number of people, and it is also suitable for medium and short distance tracking.
  • the backscattering device 201 is responsible for backscattering, that is, using the received CW as a carrier wave, and transmitting an advertising signal that meets the requirements of the BLE standard through backscattering.
  • the tracking device emits the unique code (ID) of the tracking device when backscattering the BLE information.
  • ID is similar to the serial number (SN) of the terminal device and has the following characteristics: 1. Uniqueness, each tracking device contains a unique ID . 2. It cannot be changed. Once the package is completed, no one or organization has the ability and authority to change this ID.
  • FIG. 3A it is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention.
  • the tracking device may also include: a continuous wave CW device 202 and a Bluetooth device 203, and the CW device 202 is connected to the Bluetooth device 203 and the backscatter device 201 respectively;
  • the CW device 202 is used to generate and send a second continuous wave
  • the Bluetooth device 203 is further configured to receive a second Bluetooth low energy broadcast signal, the second Bluetooth low energy broadcast signal being a signal reflected by the first target tracking device according to the second continuous wave, and the second Bluetooth low energy
  • the power consumption broadcast signal includes the identification of the first target tracking device.
  • the Bluetooth device 203 is a Bluetooth module that complies with Bluetooth 4.2 and above standards, and includes a Bluetooth receiver and a Bluetooth transmitter, which may be referred to as a Bluetooth transceiver and a Bluetooth modem for short.
  • the tracking device can not only receive the first continuous wave through the backscattering device 201 and reflect the first Bluetooth low energy broadcast signal, but also can generate and send the second continuous wave through the CW device 202 through the Bluetooth device.
  • 203 receives the second Bluetooth low energy broadcast signal reflected by other tracking devices. That is, the tracking device can track other tracking devices or be tracked by other tracking devices.
  • CW device 202 may include: CW modem 2021, CW transmitter 2022 and CW antenna 2023, CW modem 2021 is connected to CW transmitter 2022, CW transmitter 2022 is connected to CW antenna 2023; CW modem 2021 is connected to Bluetooth device 203 and backscatter The devices 201 are connected separately;
  • CW modem 2021 configured to generate the second continuous wave
  • the CW transmitter 2022 is configured to transmit the second continuous wave through the CW antenna 2023.
  • the CW modem 2021 can be understood as a CW core.
  • CW core is a device used to generate CW waves, which controls the generation of CW waves, including defining the CW wave waveform, frequency, turn-on and turn-on time, etc.
  • the CW transmitter 2022 is responsible for converting the digital signal generated from the CW core into an analog signal, filtering and amplifying the analog signal, and transmitting it to the outside through the CW antenna 2023.
  • an implementation manner of the internal structure of the CW device 202 is provided, which increases the feasibility of the solution.
  • the Bluetooth device 203 may include a Bluetooth receiver 2031;
  • the CW transmitter 2022 and the Bluetooth receiver 2031 are configured to be turned on during the first active scan duration t1, which is within the working period T1 of the CW transmitter 2022.
  • the start time of t1 may be the same as the start time of T1, or may be later than the start time of T1, and the end time of t1 is earlier than the end time of T1.
  • the CW transmitter 2022 and the Bluetooth receiver 2031 can be turned on at the same time, that is, the CW transmitter 2022 can transmit CW waves, and the Bluetooth receiver 2031 can also synchronously receive Bluetooth low energy broadcast signals.
  • the backscattering device 201 is further configured to generate the first Bluetooth low energy broadcast signal according to the first continuous wave; determine according to the first active scanning duration t1 The first delay; the first Bluetooth low energy broadcast signal is reflected according to the first delay; wherein, the first delay is less than the t1, and the t1 is within the working period T1 of the CW transmitter 2022 .
  • the first time delay determined by the backscattering device 201 each time may be random, or may be determined in the order of N from small to large.
  • FIG. 3D it is a schematic diagram of the working period and active scanning duration of the CW transmitter inside the tracking device in the embodiment of the present invention.
  • the working period of the CW transmitter 2022 is T1.
  • the active scan duration (continuous transmission of CW waves) is t1sweep.
  • the terminal device can turn on the Bluetooth receiver and CW transmitter at the same time.
  • the terminal device 0 (user 0 for short) that actively transmits CW signals can be understood as a card reader, and other terminal devices that transmit BLE signals through the backscatter device can be It is understood as a label. Therefore, there is a possibility that the tag signal enters the receiving device of user 0 at the same time, causing signal conflicts, thereby reducing the efficiency of user 0's identification of the tag.
  • the embodiment of the present invention proposes a time division mechanism to reduce the impact of multi-tag transmission.
  • FIG. 3E it is a schematic diagram of the backscatter time mechanism in the embodiment of the present invention.
  • the first active scanning duration t1 may be equally divided into n time slots s1, s2, s3...sn.
  • the backscattering device in the terminal equipment N monitors the CW wave, and before the backscattering, the processor in the backscattering device randomly generates a delay time (t1delay), which is the first delay mentioned above, t1delay
  • the backscatter device can reflect the first Bluetooth low energy broadcast signal according to the t1delay. In this way, for the terminal device 0, the probability of multiple tags working in the same time period is reduced, and signal conflicts are reduced.
  • FIG. 4A it is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention.
  • the tracking device may also include: a cellular radio frequency device 204 and a Bluetooth device 203, and the cellular radio frequency device 204 is connected to the Bluetooth device 203 and the backscatter device 201 respectively;
  • the cellular radio frequency device 204 is configured to generate and transmit the third continuous wave
  • the Bluetooth device 203 is further configured to receive a third Bluetooth low energy broadcast signal, the third Bluetooth low energy broadcast signal being a signal reflected by the second target tracking device according to the third continuous wave, and the third Bluetooth low energy
  • the power consumption broadcast signal includes the identification of the second target tracking device.
  • the tracking device can not only receive the first continuous wave through the backscattering device 201 and reflect the first Bluetooth low energy broadcast signal, but also can generate and send the third continuous wave through the cellular radio frequency device 204, through Bluetooth
  • the device 203 receives the third Bluetooth low energy broadcast signal reflected by other tracking devices. That is, the tracking device can track other tracking devices or be tracked by other tracking devices.
  • the cellular radio frequency device 204 in the tracking device is capable of transmitting CW waves of a certain frequency, so it can replace the dedicated CW device and reduce the hardware cost.
  • the cellular radio frequency device 204 may include: a cellular modem 2041, a cellular radio frequency front end 2042, and a cellular antenna 2043.
  • the cellular modem 2041 is connected to the cellular radio frequency front end 2042, the cellular radio frequency front end 2042 is connected to the cellular antenna 2043; the cellular modem 2041 is connected to the Bluetooth device 203 and the reverse The scattering devices 201 are connected separately;
  • a cellular modem 2041 configured to generate the third continuous wave
  • the cellular radio frequency front end 2042 is configured to transmit the third continuous wave through the cellular antenna 2043.
  • an implementation manner of the internal structure of the cellular radio frequency device 204 is provided, which increases the feasibility of the solution.
  • the Bluetooth device 203 may include a Bluetooth receiver 2031;
  • the cellular radio frequency front end 2042 and the Bluetooth receiver 2031 are configured to be turned on during the second active scanning duration t2, which is within the working period T2 of the cellular radio frequency front end 2042.
  • the start time of t2 may be the same as the start time of T2, or may be later than the start time of T2, and the end time of t2 is earlier than the end time of T2.
  • the cellular radio frequency front end 2042 and the Bluetooth receiver 2031 can be turned on at the same time, that is, the cellular radio frequency front end 2042 can transmit CW waves, and the Bluetooth receiver 2031 can also synchronously receive Bluetooth low energy broadcast signals.
  • the backscattering device 201 is further configured to generate the first Bluetooth low energy broadcast signal according to the first continuous wave; determine according to the second active scanning duration t2 The second delay; the first Bluetooth low energy broadcast signal is reflected according to the second delay; wherein, the second delay is less than the t2, and the t2 is within the working period T2 of the cellular radio frequency front end 2042 .
  • the second time delay determined by the backscattering device 201 each time may be random, or may be determined in the order of M from small to large.
  • the working period T2 of the cellular radio frequency front-end 2042, the second active scanning duration t2 in T2, and the description of the second delay in the backscatter time mechanism can refer to the working period T1 of the CW transmitter 2022
  • the description of the first active scanning duration t1 in T1 (as shown in FIG. 3D) and the first delay in the backscattering time mechanism (as shown in FIG. 3E) will not be repeated here.
  • first target tracking device and second target tracking device are devices around the tracking device.
  • FIG. 5A it is a schematic diagram of an embodiment of the backscattering device in the embodiment of the present invention.
  • the backscatter device 201 may include: a processor 2011, an oscillator 2012, an encoder 2013, and a first Bluetooth antenna 2014.
  • the processor 2011 is connected to the oscillator 2012, the oscillator 2012 is connected to the encoder 2013, and the encoder 2013 is connected to the first Bluetooth antenna.
  • the processor 2011 is specifically configured to receive the first continuous wave through the first Bluetooth antenna 2014; according to the first continuous wave, control the oscillator 2012 to switch the target frequency, control the encoder 2013 to encode according to the target frequency, and pass The first Bluetooth antenna 2014 reflects the first Bluetooth low energy broadcast signal.
  • the encoder 2013 is a device that implements encoding by changing the impedance matching of the first Bluetooth antenna 2014.
  • the encoder 2013 may be a field effect transistor (Field Effect Transistor, FET) or the like.
  • the processor 2011 may be a microprocessor, etc., which is not limited here.
  • FIG. 5B it is a schematic diagram of another embodiment of the backscattering device in the embodiment of the present invention.
  • the backscatter device 201 may further include: a rectifier 2015, and the rectifier 2015 is connected to the processor 2011;
  • the rectifier 2025 is configured to obtain the first continuous wave, convert the first continuous wave into a direct current signal, and start the processor 2011 when the voltage of the direct current signal is higher than a preset threshold.
  • the rectifier 2025 may include a diode and a capacitor. One end of the diode is connected to the first Bluetooth antenna 2014, and the other end of the diode is respectively connected to one end of the capacitor and the processor 2011. The other end is grounded.
  • FIG. 5C it is a schematic diagram of another embodiment of the backscattering device in the embodiment of the present invention.
  • the backscatter device is used to "transmit" the BLE advertising signal using CW as a carrier wave.
  • the backscatter device 201 may include a rectifier 2025, a processor 2011, an oscillator 2012, and an encoder 2013.
  • the encoder 2013 may be a FET switch.
  • the rectifier 2025 is responsible for "monitoring" the CW signal, and converts the radio frequency (RF) energy corresponding to the CW signal into a direct current (DC) voltage.
  • RF radio frequency
  • DC direct current
  • the processor 2011 controls the oscillator 2012, and the oscillator 2012 controls the FET switch to achieve signal encoding that meets the requirements of the BLE tag by switching the frequencies f1 and f2. It is understandable that the CW signal is one of the cases of RF.
  • the CW transmitter in the tracking device since the CW transmitter in the tracking device only transmits CW waves that have not been encoded, there is no problem of increased decoding errors caused by multiple CW conflicts.
  • a possible problem is that the superposition of CWs from different terminals increases or decreases the energy radiated to the backscatter receiver due to different phases.
  • the superposition of the CW signal due to the reflectors in the environment will be caused, which is unpredictable for the superposition effect. Therefore, in order to reduce the complexity of the system, this proposal does not make special treatment for multi-transmitter conflicts.
  • the user can freely choose to turn on or turn off the backscatter device 201, the CW device 202, the Bluetooth device 203, or the cellular radio frequency device 204. If the user chooses to turn on, the tracking device correspondingly turns on the backscatter device 201, the CW device 202, the Bluetooth device 203 or the cellular radio frequency device 204, and is in the working mode. If the user chooses to turn off, the tracking device will turn off the backscatter device 201, CW device 202, Bluetooth device 203, or cellular radio frequency device 204, or backscatter device 201, CW device 202, Bluetooth device 203, or cellular radio frequency device 204. In sleep mode. Users can choose according to actual needs to improve user experience. When no work is needed, the tracking device can be turned off or hibernated, which can save power.
  • FIG. 6 it is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention, which may include: the tracking device may also include: a Bluetooth device 203, a switch 205, and The second Bluetooth antenna 206, the switch 205 and the second Bluetooth antenna 206 are connected;
  • the Bluetooth device 203 is used to connect with the second Bluetooth antenna 206 through the switch 205 during the reflection period;
  • the backscattering device 201 is used to connect to the second Bluetooth antenna 206 through the switch 205 during the non-reflective period.
  • the working frequency of the backscattering device 201 is the same as the working frequency of the Bluetooth device 203.
  • the backscattering device 201 also works at the Bluetooth frequency of 2.4-2.5 GHz, so the backscattering device 201 and the Bluetooth device 203 can share an antenna.
  • the switch here may be a single pole double throw (Single Pole Double Throw, SPDT) switch. That is, the Bluetooth device 203 and the backscatter device 201 can share an antenna with the SPDT switch. In the default mode, the backscatter device can communicate with the Bluetooth antenna, ready for signal reflection at any time.
  • the SPDT switch After the processor 2011 in the backscattering device 201 determines the time slot for backscattering, in the non-transmitting time slot, the SPDT switch switches the Bluetooth device 203 to the channel for "monitoring" the reflection information of nearby tags. When the time reaches the emission time slot, the SPDT switch switches back to the backscattering device 201 to perform backscattering.
  • FIG. 7 it is a schematic diagram of an embodiment of the terminal device in the embodiment of the present invention.
  • the terminal device may include any one of the tracking described in FIG. 2, FIG. 3A-FIG. 3C, FIG. 4A-FIG. 4C, and FIG. 6. Device.
  • the terminal device can use the backscatter technology to quickly record medium and short distance contact history information.
  • the use of backscatter technology avoids the complex data exchange standards of Bluetooth and improves the efficiency of data extraction. From the definition of the data interaction of the hardware, the short- and medium-distance contact history record is realized.
  • FIG. 8 it is a schematic diagram of an embodiment of the tracking method in the embodiment of the present invention. This method is applied to the tracking device described in the embodiment of the present invention, or the terminal device described in the embodiment of the present invention, wherein the terminal device includes a tracking device, and the tracking device includes a backscatter device (refer to FIG. 2)
  • the method includes:
  • the tracking device receives the first continuous wave through the backscatter device.
  • the backscatter device includes: a processor, an oscillator, an encoder, and a first Bluetooth antenna (refer to FIG. 5A), the processor is connected to the oscillator, and the oscillator is connected to the The encoder is connected, and the encoder is connected with the first Bluetooth antenna.
  • the tracking device receives the first continuous wave through the first Bluetooth antenna, and the processor obtains the first continuous wave.
  • the backscattering device further includes: a rectifier (refer to FIG. 5B), the rectifier is connected to the processor; the tracking device obtains the first continuous wave through the rectifier, and converts the first continuous wave The wave is converted into a direct current voltage, and when the direct current voltage is higher than a preset threshold, the processor is started.
  • a rectifier (refer to FIG. 5B)
  • the rectifier is connected to the processor
  • the tracking device obtains the first continuous wave through the rectifier, and converts the first continuous wave The wave is converted into a direct current voltage, and when the direct current voltage is higher than a preset threshold, the processor is started.
  • the 802. Reflect a first Bluetooth low energy broadcast signal according to the first continuous wave, where the first Bluetooth low energy broadcast signal includes the identification of the tracking device.
  • the tracking device reflects a first Bluetooth low energy broadcast signal according to the first continuous wave through a backscatter device, and the first Bluetooth low energy broadcast signal includes the identification of the tracking device.
  • the processor controls the oscillator to switch the target frequency according to the first continuous wave, controls the encoder to perform encoding according to the target frequency, and reflects the first Bluetooth low voltage through the first Bluetooth antenna Power consumption broadcast signal.
  • the tracking device further includes: a continuous wave CW device and a Bluetooth device (refer to FIG. 3A), and the CW device is connected to the Bluetooth device and the backscatter device respectively
  • the tracking device generates and sends a second continuous wave through the CW device;
  • the tracking device receives a second Bluetooth low energy broadcast signal through the Bluetooth device, and the second Bluetooth low energy broadcast signal is the first target tracking
  • the device is based on the signal reflected by the second continuous wave, and the second Bluetooth low energy broadcast signal includes the identification of the first target tracking device.
  • the CW device includes: a CW modem, a CW transmitter, and a CW antenna (refer to FIG. 3B), the CW modem is connected to the CW transmitter, and the CW transmitter is connected to the CW antenna; The CW modem is connected to the Bluetooth device and the backscatter device respectively; the tracking device generates the second continuous wave through the CW modem; the tracking device uses the CW transmitter to transmit through the CW antenna The second continuous wave.
  • the Bluetooth device includes a Bluetooth receiver (refer to FIG. 3C); the tracking device may turn on the CW transmitter and the Bluetooth receiver within the first active scan duration t1, where t1 is in the CW Within the working period T1 of the transmitter (refer to Figure 3D).
  • the tracking device further includes: a cellular radio frequency device and a Bluetooth device (refer to FIG. 4A), and the cellular radio frequency device is separate from the Bluetooth device and the backscatter device. Connection; the tracking device generates and sends a third continuous wave through the cellular radio frequency device; the tracking device receives the third Bluetooth low energy broadcast signal through the Bluetooth device, and the third Bluetooth low energy broadcast signal is the second The target tracking device is based on the signal reflected by the third continuous wave, and the third Bluetooth low energy broadcast signal includes the identification of the second target tracking device.
  • the cellular radio frequency device includes: a cellular modem, a cellular radio frequency front end, and a cellular antenna (refer to FIG. 4B), the cellular modem is connected to the cellular radio frequency front end, and the cellular radio frequency front end is connected to the cellular antenna
  • the cellular modem is connected to the Bluetooth device and the backscattering device respectively; the tracking device generates the third continuous wave through the cellular modem; the tracking device uses the cellular radio frequency front end through the cellular antenna Send the third continuous wave.
  • the Bluetooth device includes a Bluetooth receiver (refer to FIG. 4C); the tracking device may turn on the cellular radio frequency front end and the Bluetooth receiver within the second active scanning duration t2, and the t2 is in the cellular Within the working period T2 of the radio frequency front end (refer to Figure 3D).
  • the tracking device generates the first Bluetooth low energy broadcast signal according to the first continuous wave through the backscatter device; determines the second time delay according to the second active scanning duration t2; The second delay reflects the first Bluetooth low energy broadcast signal; wherein, the second delay is less than the t2, and the t2 is within the working period T2 of the cellular radio frequency front end.
  • the tracking device further includes: a Bluetooth device, a switch, and a second Bluetooth antenna (refer to FIG. 6).
  • the switch is connected to the second Bluetooth antenna;
  • the Bluetooth device is connected to the second Bluetooth antenna through the switch during the reflection period;
  • the tracking device is connected to the second Bluetooth antenna through the switch through the backscattering device during the non-reflection period.
  • the tracking device includes a backscattering device, that is, the backscattering technology is adopted, which avoids the complex data exchange standard of Bluetooth and improves the efficiency of data extraction.
  • the first Bluetooth low energy broadcast signal includes the identification of the tracking device.
  • the identification of the tracking device can be used to identify the tracking device.
  • the use of the backscatter device to receive the first continuous wave and reflect the first Bluetooth low energy broadcast signal has no limit on the number of people, and it is also suitable for medium and short distance tracking.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be stored by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

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Abstract

Certains modes de réalisation de la présente invention concernent un appareil de suivi, un dispositif terminal, et un procédé de suivi, destinés à utiliser une technologie de rétrodiffusion pour remplacer une norme Bluetooth complexe d'échange de données et améliorer le rendement d'extraction de données. L'appareil comporte: un dispositif de rétrodiffusion, le dispositif de rétrodiffusion étant utilisé pour recevoir une première onde continue et réfléchir un premier signal de diffusion Bluetooth de faible énergie selon la première onde continue, et le premier signal de diffusion Bluetooth de faible énergie comportant un identifiant de l'appareil de suivi.
PCT/CN2020/087278 2020-04-27 2020-04-27 Appareil de suivi, dispositif terminal, et procédé de suivi WO2021217354A1 (fr)

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CN202080099266.XA CN115362697A (zh) 2020-04-27 2020-04-27 一种追踪装置、终端设备及追踪方法
PCT/CN2020/087278 WO2021217354A1 (fr) 2020-04-27 2020-04-27 Appareil de suivi, dispositif terminal, et procédé de suivi

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US20160365890A1 (en) * 2014-12-19 2016-12-15 University Of Washington Devices and methods for backscatter communication using one or more wireless communication protocols including bluetooth low energy examples
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US20160365890A1 (en) * 2014-12-19 2016-12-15 University Of Washington Devices and methods for backscatter communication using one or more wireless communication protocols including bluetooth low energy examples
CN109522587A (zh) * 2017-09-19 2019-03-26 西门子股份公司 用于在工业自动化环境中自动生成交互式布线图的方法和系统
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WO2024045194A1 (fr) * 2022-09-02 2024-03-07 Oppo广东移动通信有限公司 Procédé et appareil de positionnement, et dispositif de communication

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