WO2021217354A1

WO2021217354A1 - Tracking apparatus, a terminal device, and tracking method

Info

Publication number: WO2021217354A1
Application number: PCT/CN2020/087278
Authority: WO
Inventors: 邵帅
Original assignee: Oppo广东移动通信有限公司
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2021-11-04
Also published as: CN115362697A

Abstract

Embodiments of the present invention provide a tracking apparatus, a terminal device, and a tracking method, for using a backscattering technology to replace a complex Bluetooth data exchange standard and improve data extraction efficiency. The apparatus comprises: a backscattering device, the backscattering device being used for receiving a first continuous wave and reflecting a first Bluetooth low energy broadcast signal according to the first continuous wave, and the first Bluetooth low energy broadcast signal comprising an identifier of the tracking apparatus.

Description

Tracking device, terminal equipment and tracking method

Technical field

The present invention relates to the field of communications, in particular to a tracking device, terminal equipment and a tracking method.

Background technique

In 2020, Covid-19 (coronavirus) is rampant around the world. 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. Among them, 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. The tracking system can be applied to Apple (iOS) or Android (android) smart terminals. By using a Bluetooth beacon (Beacon), you can obtain the history of personal contact, that is, when and where someone A and someone B have been in contact. Personnel tracking at close range.

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. However, 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. Moreover, 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. According to the Bluetooth 5.0 standard, 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.

Summary of the invention

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.

Optionally, in some embodiments of the present invention, 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.

Optionally, in some embodiments of the present invention, 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.

Optionally, in some embodiments of the present invention, 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.

Optionally, in some embodiments of the present invention, 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. Antenna connection; the CW modem is connected to the Bluetooth device and the backscatter device respectively;

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.

Optionally, in some embodiments of the present invention, 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.

Optionally, in some embodiments of the present invention, 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 .

Optionally, in some embodiments of the present invention, the first time delay is N times t1/n, N=[0, n-1], and n is a positive integer.

Optionally, in some embodiments of the present invention, 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.

Optionally, in some embodiments of the present invention, 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 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.

Optionally, in some embodiments of the present invention, 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 .

Optionally, in some embodiments of the present invention, the second time delay is M times t2/m, M=[0, m-1], and m is a positive integer.

Optionally, in some embodiments of the present invention, 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. According to the terminal device provided by the aspect, 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.

In the technical solution provided by the embodiment 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. In the embodiment of the present invention, 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. Moreover, 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.

Description of the drawings

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;

4A is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention;

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.

Detailed ways

The following describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of the present invention.

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. For this kind of positioning, the relative position of the tracking system is more important than the absolute position. For example, in the tracking system described above, Bluetooth BLE is used to obtain the historical relative position of personnel. Among them, for 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.

In one implementation, it is item tracking based on radio frequency identification (RFID). 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.

In yet another implementation manner, it is item tracking based on Near Field Communication (NFC). NFC is widely integrated in smart terminals, and is mainly used for payment and other applications with high security and short communication distance. 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.

In summary, 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. Further, 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.

It is understandable that 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). For example, 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. Description of the terminal equipment: In the present invention, the terminal equipment may also include a relay, and any data communication with the base station can be regarded as terminal equipment.

As shown in FIG. 1, it is a system architecture diagram of medium and short distance contact recording applied in the embodiment of the present invention. Here, 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. As shown in Figure 1, 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.

It should be noted that, from the perspective of the UHF RFID system, 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.

As shown in FIG. 2, it is a schematic diagram of an embodiment of the tracking device in the embodiment of the present invention. 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.

In the embodiment of the present invention, 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. Moreover, 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.

It can be understood that 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. This 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.

Optionally, in some embodiments of the present invention, as shown in 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.

It can be understood that 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.

In the embodiment of the present invention, 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.

Optionally, in some embodiments of the present invention, as shown in FIG. 3B, it is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention. 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.

It is understandable that 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.

In the embodiment of the present invention, an implementation manner of the internal structure of the CW device 202 is provided, which increases the feasibility of the solution.

Optionally, in some embodiments of the present invention, as shown in FIG. 3C, it is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention. 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. Optionally, 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. Further, in 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.

Optionally, in some embodiments of the present invention, 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 . Further, the first time delay is N times t1/n, N=[0, n-1], and n is a positive integer.

Optionally, 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.

The following description is given by way of example. As shown in 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. As shown in FIG. 3D, the working period of the CW transmitter 2022 is T1. Within one T1, the active scan duration (continuous transmission of CW waves) is t1sweep. In t1sweep, the terminal device can turn on the Bluetooth receiver and CW transmitter at the same time.

It is understandable that when the user activates the medium and short distance contact recording function on the terminal device, or the terminal device automatically activates the medium and short distance contact recording function. It should be noted that in the system architecture diagram shown in Figure 1, 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. As shown in FIG. 3E, it is a schematic diagram of the backscatter time mechanism in the embodiment of the present invention. Exemplarily, 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 range of is N*(t1/n), N=[0,n-1]. 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.

Optionally, in some embodiments of the present invention, as shown in 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.

In the embodiment of the present invention, 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. Moreover, 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.

Optionally, in some embodiments of the present invention, as shown in FIG. 4B, it is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention. 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.

In the embodiment of the present invention, an implementation manner of the internal structure of the cellular radio frequency device 204 is provided, which increases the feasibility of the solution.

Optionally, in some embodiments of the present invention, as shown in FIG. 4C, it is a schematic diagram of another embodiment of the tracking device in the embodiment of the present invention. 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. Optionally, 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. Further, in 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.

Optionally, in some embodiments of the present invention, 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 . Further, the second time delay is M times t2/m, M=[0, m-1], and m is a positive integer.

Optionally, 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.

It should be noted that 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.

It is understandable that the aforementioned first target tracking device and second target tracking device are devices around the tracking device.

Optionally, in some embodiments of the present invention, as shown in 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. Bluetooth antenna 2014 connection;

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.

It should be noted that the encoder 2013 is a device that implements encoding by changing the impedance matching of the first Bluetooth antenna 2014. For example, 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.

Optionally, in some embodiments of the present invention, as shown in 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.

Optionally, in some embodiments of the present invention, 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.

Exemplarily, as shown in 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. Among them, 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. When the DC voltage is higher than the limit value, the processor 2011 is awakened and is ready for backscattering. During the backscattering process, 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.

It should be noted that there is a correspondence between the CW frequency in the embodiment of the present invention and the frequencies f1 and f2 generated by the oscillator 2012 in the backscattering device 201. Take the use of a cellular network to transmit CW signals as an example. For terminal equipment that supports 4G LTE and 5G NR and subsequent higher communication levels, 4G B40 and 5G n40 frequency bands are supported. As shown in Table 1 below, it is the correspondence between CW frequency and f1 and f2. Among them, in Table 1, 5MHz<f0<50MHz.

Table 1

It should be noted that, in the embodiment of the present invention, 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. However, in a specific application, even if a transmitter is used to emit CW waves, 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.

Optionally, in some embodiments of the present invention, 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.

Optionally, in some embodiments of the present invention, as shown in 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.

It can be understood that the working frequency of the backscattering device 201 is the same as the working frequency of the Bluetooth device 203. For example, 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.

Exemplarily, 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. 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.

As shown in 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.

In the embodiment of the present invention, the terminal device can use the backscatter technology to quickly record medium and short distance contact history information. Provides a new solution for handling contact history of people similar to Covid19. Compared with the traditional Bluetooth technology, this technology can obtain information faster, and can obtain more personnel information at the same time. Moreover, 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.

As shown in 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:

801. Receive the first continuous wave.

The tracking device receives the first continuous wave through the backscatter device.

Optionally, 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.

Optionally, 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.

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.

Optionally, 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.

(1) In an optional implementation manner, 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.

Optionally, 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.

Optionally, 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).

Optionally, the tracking device generates the first Bluetooth low energy broadcast signal according to the first continuous wave through the backscatter device; determines the first time delay according to the first active scanning duration t1; The first time delay reflects the first Bluetooth low energy broadcast signal; wherein, the first time delay is less than the t1, and the t1 is within the working period T1 of the CW transmitter. Further, the first time delay is N times t1/n (refer to FIG. 3E), N=[0, n-1], and n is a positive integer.

(2) In yet another alternative implementation manner, 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.

Optionally, 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.

Optionally, 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).

Optionally, 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. Further, the second time delay is M times t2/m (refer to FIG. 3E), M=[0, m-1], and m is a positive integer.

Optionally, in some embodiments of the present invention, 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.

It should be noted that, for related content in the embodiment shown in FIG. 8, you can also refer to the above description of the tracking device for details, which will not be repeated here.

In the embodiment of the present invention, in the embodiment of the present invention, 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. Moreover, 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.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. 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. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). 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)).

The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not need to be used To describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in a sequence other than the content illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those clearly listed. Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

Claims

A tracking device, characterized in that it comprises: a backscatter device;

The backscattering device is configured to receive a first continuous wave; according to the first continuous wave, a first Bluetooth low energy broadcast signal is reflected, and the first Bluetooth low energy broadcast signal includes the identification of the tracking device .
The tracking device according to claim 1, wherein the backscattering device comprises: a processor, an oscillator, an encoder, and a first Bluetooth antenna, the processor is connected to the oscillator, and the oscillator The encoder is 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 tracking device according to claim 2, wherein the backscatter device further comprises: 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 according to any one of claims 1 to 3, wherein the tracking device further comprises: a continuous wave CW device and a Bluetooth device, the CW device and the Bluetooth device and the backscatter The devices are connected separately;

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 tracking device according to claim 4, wherein the CW device comprises: 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 transmitter. CW antenna connection; the CW modem is connected to the Bluetooth device and the backscatter device respectively;

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 tracking device according to claim 5, wherein the Bluetooth device comprises 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 tracking device according to any one of claims 4-6, wherein:

The backscattering device is further configured to generate the first Bluetooth low energy broadcast signal according to the first continuous wave; determine a first time delay according to the first active scanning duration t1; and according to the first time delay Reflecting the first Bluetooth low energy broadcast signal;

Wherein, the first time delay is less than the t1, and the t1 is within the working period T1 of the CW transmitter.
8. The tracking device according to claim 7, wherein the first time delay is N times t1/n, N=[0, n-1], and n is a positive integer.
The tracking device according to any one of claims 1 to 3, wherein the tracking device further comprises: a cellular radio frequency device and a Bluetooth device, the cellular radio frequency device and the Bluetooth device and the backscatter The devices are connected separately;

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 tracking device according to claim 9, wherein the cellular radio frequency device comprises: 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. The cellular antenna is connected; 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 tracking device according to claim 10, wherein the Bluetooth device comprises 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 tracking device according to any one of claims 9-11, wherein:

The backscattering device is further configured to generate the first Bluetooth low energy broadcast signal according to the first continuous wave; determine a second time delay according to the second active scanning duration t2; according to the second time delay Reflecting the first Bluetooth low energy broadcast signal;

Wherein, the second time 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 according to claim 12, wherein the second time delay is M times t2/m, M=[0, m-1], and m is a positive integer.
The tracking device according to claim 1, wherein the tracking device further comprises: 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 terminal device, wherein the terminal device comprises the tracking device according to any one of claims 1-14.
A tracking method, characterized in that the method is applied to the tracking device according to any one of claims 1-14, or the terminal device according to claim 15, and the method comprises:

Receive the first continuous wave;

According to the first continuous wave, a first Bluetooth low energy broadcast signal is reflected, and the first Bluetooth low energy broadcast signal includes an identification of the tracking device.
A computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute the method according to claim 16.