Wireless communication method and system, radio frequency tag and vehicle
The radio frequency signal sends charging signals and instructions to the target radio frequency tag through the radio frequency signal sending device, solving the problems of complex system and high energy consumption when communicating with the vehicle and the parking lot, and achieving more stable and efficient communication.
Patent Information
- Application Number
- CN202510168959.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2025-06-24
AI Technical Summary
In the prior art, communication between a vehicle and a parking lot is initiated by a vehicle. When there are a large number of vehicles that initiate communication at the same time, the communication system is complex, the communication quality is low, and the vehicle consumes excessive energy consumption.
The radio frequency signal transmitting device sends a charging signal to the target radio frequency tag, which is charged and enters the working state, and then sends a target instruction and a carrier signal to the radio frequency tag. After the radio frequency tag executes the instruction, the communication between the vehicle and the parking lot is initiated by the radio frequency signal transmitting device set in the parking lot.
This avoids the complex communication system problem caused by too many vehicles that initiate communication at the same time, improves communication stability between the vehicle and the parking lot, and reduces vehicle energy consumption.
Smart Images
Figure CN120197632A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of wireless communication technologies, and in particular, to a wireless communication method, system, radio frequency tag, and vehicle. Background Art
[0002] With the development of Internet of Things technologies and the rapid development of the intelligent transportation field, wireless communication between vehicles and parking lots has become an important research direction.
[0003] In related technologies, the communication method between a vehicle and a parking lot is as follows: A radio frequency module is provided on the vehicle, which actively generates and emits an electromagnetic signal, and a radio frequency signal receiving device provided in the parking lot receives the above radio frequency signal, thereby realizing data interaction.
[0004] In related technologies, since the communication between a vehicle and a parking lot is actively initiated by the vehicle, when the number of vehicles initiating communication simultaneously is large, the communication system is relatively complex at this time, and the communication quality is low. Summary of the Invention
[0005] This application provides a wireless communication method, system, radio frequency tag, and vehicle.
[0006] In a first aspect, an embodiment of this application provides a wireless communication method, including: A radio frequency signal sending device sends a charging signal; a target radio frequency tag in at least one radio frequency tag charges itself based on the charging signal and then enters a working state, and the resonance frequency of an impedance matching circuit in the target radio frequency tag matches the frequency of the charging signal; the radio frequency signal sending device sends a target instruction to the target radio frequency tag; the target radio frequency tag receives the target instruction, parses the target instruction, and executes the target instruction; the radio frequency signal sending device sends a carrier signal to the target radio frequency tag; the target radio frequency tag sends an execution result of the target instruction based on the carrier signal; and a radio frequency signal receiving device receives the execution result of the target instruction.
[0007] In a second aspect, an embodiment of this application provides a wireless communication method applied to a radio frequency tag. The method includes: Charging itself based on a charging signal sent by a radio frequency signal sending device and then entering a working state; receiving a target instruction sent by the radio frequency signal sending device; parsing the target instruction; executing the target instruction; and sending an execution result of the target instruction based on a carrier signal sent by the radio frequency signal sending device.
[0008] In a third aspect, an embodiment of the present application provides a wireless communication method, which is applied to a radio frequency signal transmitting device. The method includes: sending an energizing signal to a target radio frequency tag among at least one radio frequency tag; sending a target instruction to the target radio frequency tag after the target radio frequency tag enters the working state to instruct the target radio frequency tag to parse and execute the target instruction; and sending a carrier signal to the target radio frequency tag to instruct the target radio frequency tag to send the execution result of the target instruction based on the carrier signal.
[0009] In a fourth aspect, an embodiment of the present application provides a wireless communication system, including: a radio frequency signal transmitting device configured to send an energizing signal; at least one radio frequency tag including a target radio frequency tag, where the resonant frequency of the impedance matching circuit in the target radio frequency tag matches the frequency of the energizing signal, and the target radio frequency tag is configured to energize itself based on the energizing signal and then enter the working state; the radio frequency signal transmitting device is further configured to send a target instruction to the target radio frequency tag; the target radio frequency tag is further configured to receive the target instruction, parse the target instruction, and execute the target instruction; the radio frequency signal transmitting device is further configured to send a carrier signal to the target radio frequency tag; the target radio frequency tag is further configured to send the execution result of the target instruction based on the carrier signal; and a radio frequency signal receiving device configured to receive the execution result of the target instruction.
[0010] In a fifth aspect, an embodiment of the present application provides a radio frequency tag, which is configured to: energize itself based on the energizing signal sent by the radio frequency signal transmitting device and then enter the working state; receive the target instruction sent by the radio frequency signal transmitting device; parse the target instruction; execute the target instruction; and send the execution result of the target instruction based on the carrier signal sent by the radio frequency signal transmitting device.
[0011] In a sixth aspect, an embodiment of the present application provides a radio frequency signal transmitting device, which is configured to: send an energizing signal to a target radio frequency tag among at least one radio frequency tag, and send a target instruction to the target radio frequency tag after the target radio frequency tag enters the working state to instruct the target radio frequency tag to parse and execute the target instruction; and send a carrier signal to the target radio frequency tag to instruct the target radio frequency tag to send the execution result of the target instruction based on the carrier signal.
[0012] In a seventh aspect, an embodiment of the present application provides a vehicle, and the vehicle includes the radio frequency tag described in the fifth aspect.
[0013] In an eighth aspect, an embodiment of the present application further provides an electronic device, and the electronic device includes the radio frequency signal transmitting device described in the sixth aspect.
[0014] Compared with the prior art, in the technical solution provided by the embodiment of the present application, the radio frequency signal transmitting device first sends an energizing signal to the target radio frequency tag so that the target radio frequency tag enters the working state after being energized, and then sends a target instruction to the target radio frequency tag, and sends a carrier signal to the target radio frequency tag. After the target radio frequency tag executes the target instruction, it sends the instruction execution result of the target instruction outward based on the carrier signal. In the embodiment of the present application, the communication process between the vehicle and the parking lot is initiated by the radio frequency signal transmitting device provided in the parking lot, which can avoid the problem of the overly complex communication system caused by too many vehicles initiating communication simultaneously, thereby improving the communication stability between the vehicle and the parking lot. In addition, the target radio frequency tag is energized and operates based on the energizing signal sent by the radio frequency signal transmitting device without consuming vehicle energy. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0016] Figure 1 It is a structural diagram of a wireless communication system provided by an embodiment of the present application.
[0017] Figure 2 It is a schematic diagram of an implementation environment provided by an embodiment of the present application.
[0018] Figure 3 It is a flowchart of a wireless communication method applied to a wireless communication system provided by an embodiment of the present application.
[0019] Figure 4 It is a flowchart of a wireless communication method applied to a wireless communication system provided by another embodiment of the present application.
[0020] Figure 5 It is a waveform diagram of a PWM wave and a target instruction provided by an embodiment of the present application.
[0021] Figure 6 It is a flowchart of a wireless communication method applied to a radio frequency tag provided by an embodiment of the present application.
[0022] Figure 7 It is a flowchart of a wireless communication method applied to a radio frequency signal transmitting device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.
[0024] In order to enable those skilled in the art of this technology to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.
[0025] In the related art, the communication process between a vehicle and a parking lot is initiated by the vehicle actively. When the number of vehicles initiating communication simultaneously is large, the communication system is relatively complex at this time, and the communication quality is low. Moreover, this process will consume too much energy of the vehicle.
[0026] Based on the problems existing in the related art, an embodiment of the present application provides a wireless communication method. The radio frequency signal transmitting device first sends an energizing signal to a target radio frequency tag so that the target radio frequency tag enters a working state after being energized. Then, a target instruction is sent to the target radio frequency tag, and a carrier signal is sent to the target radio frequency tag. After the target radio frequency tag executes the target instruction, it sends the instruction execution result of the target instruction outward based on the carrier signal. In the embodiment of the present application, the communication process between the vehicle and the parking lot is initiated by the radio frequency signal transmitting device provided in the parking lot, which can avoid the problem that the communication system may be complex due to too many vehicles initiating communication simultaneously, thereby improving the communication stability between the vehicle and the parking lot. In addition, the target radio frequency tag is energized and works based on the energizing signal sent by the radio frequency signal transmitting device, without consuming the energy of the vehicle.
[0027] Please refer to Figure 1 , which shows a structural block diagram of a wireless communication system 100 provided by an embodiment of the present application. The communication system 100 includes a radio frequency signal transmitting device 10, at least one radio frequency tag 20, and a radio frequency signal receiving device 30.
[0028] The radio frequency signal transmitting device 10 is used to generate and send out radio frequency signals. The radio frequency signal transmitting device 10 may be a radio frequency source. In the embodiment of the present application, the radio frequency signal transmitting device 10 realizes energizing the radio frequency tag 20, sending instructions to the radio frequency tag 20, and sending a carrier signal through data interaction with the radio frequency tag 20 so that the radio frequency tag 20 can realize backscatter communication. In some embodiments, such as Figure 2As shown, the radio frequency signal transmitting device 10 is arranged in the parking lot 200.
[0029] The radio frequency tag 20 is an electronic tag that uses radio waves for data transmission and storage. In the embodiment of the present application, the radio frequency tag 20 is a backscatter tag and can implement backscatter communication by using the carrier signal transmitted by the radio frequency signal transmitting device 10. In addition, the radio frequency tag 20 can also be energized by using the charging signal transmitted by the radio frequency signal transmitting device 10 and execute the instructions issued by the radio frequency signal transmitting device 10.
[0030] In some embodiments, the radio frequency tag 20 includes an antenna, a charging circuit, and a processing chip. The antenna is used to realize the transceiver of radio frequency signals. The charging circuit is used to realize charging based on the charging signal transmitted by the radio frequency signal transmitting device 10. Optionally, the charging circuit includes an impedance matching circuit, a rectifier voltage multiplier circuit, and a super capacitor. Among them, the impedance matching circuit has a resonant frequency, which can allow alternating current of a specified frequency band to pass through while blocking alternating current of other frequencies. The rectifier voltage multiplier circuit is used to convert the alternating current signal into a direct current signal and double the voltage. The super capacitor is used to store electric energy. The processing chip is used to execute the instructions issued by the radio frequency signal transmitting device 10.
[0031] When there are multiple radio frequency tags 20, the resonant frequencies of the impedance matching circuits in different radio frequency tags 20 can be the same or different. In the embodiment of the present application, only the case where the resonant frequencies of the impedance matching circuits in different radio frequency tags 20 are different is taken as an example for illustration. Specifically, the resonant frequency f of the impedance matching circuit in the radio frequency tag 20 n is represented by the following calculation formula:
[0032]
[0033] where, L n is the equivalent inductance of the radio frequency tag 20, and C n is the equivalent capacitance of the radio frequency tag 20. When the frequency of the carrier signal received by the radio frequency tag 20 is not its own resonant frequency, the voltage after rectification is not enough to reach the startup voltage of the processing chip, and at this time the radio frequency tag 20 does not work; on the contrary, when the frequency of the carrier signal received by the radio frequency tag 20 is its own resonant frequency, the voltage after rectification is enough to reach the startup voltage of the processing chip, and at this time the radio frequency tag 20 works. That is, in this way, the radio frequency signal transmitting device 10 can wake up different radio frequency tags 20 based on carrier signals of different frequencies, and further realize data interaction with different radio frequency tags 20.
[0034] In the case where there are multiple RF tags 20, a certain protection interval is provided between the resonant frequencies of the impedance matching circuits in different RF tags 20. That is, the difference between the resonant frequencies of the impedance matching circuits between any two RF tags 20 is greater than a preset frequency threshold. Exemplarily, the preset frequency threshold is 5 kHz. In this way, electromagnetic interference caused by the overly close resonant frequencies of the impedance matching circuits in different RF tags 20 can be avoided.
[0035] In some embodiments, please refer back to Figure 2 , the RF tag 20 is disposed in the vehicle 300.
[0036] The RF signal receiving device 30 is configured to obtain the instruction execution result sent by the RF tag 20. The RF signal receiving device 30 may be a reader. In some embodiments, please refer back to Figure 2 , the RF signal receiving device 30 is disposed in the parking lot 200.
[0037] The RF signal transmitting device 10 and the RF signal receiving device 30 may be integrated in the same electronic device, or may be deployed in independent electronic devices. The embodiments of the present application do not limit this.
[0038] Please refer to Figure 3 , which shows a flowchart of a wireless communication method provided by an embodiment of the present application. This method is applied to Figure 1 the wireless communication system 100 shown. This method includes the following processes.
[0039] S301, the RF signal transmitting device transmits a charging signal.
[0040] The charging signal is used to charge the target RF tag to enable it to enter the working state. Optionally, the charging signal is a pure sine carrier signal.
[0041] The frequencies of the charging signals in different communication processes may be the same or different. In the case where the resonant frequencies of the impedance matching circuits in the RF tags set on different vehicles are the same, the frequencies of the charging signals in different communication processes are the same. In the case where the resonant frequencies of the impedance matching circuits in the RF tags set on different vehicles are different, the frequencies of the charging signals in different communication processes are different. That is, the RF signal transmitting device can transmit charging signals of different frequencies to wake up different RF tags. For example, the RF tag 1 is woken up by the charging signal with frequency f1, the RF tag 2 is woken up by the charging signal with frequency f2, and the RF tag n is woken up by the charging signal with frequency f n . In addition, the probability of the charging signal in one communication process is fixed.
[0042] When the frequency of the charging signal is not a fixed value, the RF signal transmitting device can determine the frequency of the charging signal to be transmitted in the following manner: The RF signal transmitting device receives a reminder message sent by other electronic devices in the parking lot. This reminder message is used to remind that the target vehicle has entered the parking lot, and the reminder message carries the unique identifier of the target vehicle (such as license plate number, vehicle identification number). The RF signal transmitting device queries the frequency of the impedance matching circuit in the RF tag set on the target vehicle based on this reminder message, and uses it as the frequency of the charging signal to be transmitted. The above-mentioned other electronic devices can be intelligent gate machines, intelligent monitoring devices, etc. in the parking lot.
[0043] The transmission duration of the charging signal in different communication processes can be the same or different.
[0044] In some embodiments, the RF signal transmitting device counts the charging completion durations of all RF tags, and sets the transmission duration of the charging signal according to the charging completion durations of all RF tags. The transmission duration of the charging signal is greater than or equal to the maximum value among the charging completion durations of all the above RF tags. In this embodiment, the transmission durations of the charging signal in different communication processes are the same. In this way, the RF signal transmitting device does not need to store less data, saving storage resources.
[0045] In some other embodiments, after determining the frequency of the charging signal, the RF signal transmitting device determines the transmission duration of the charging signal based on a preset mapping relationship and the frequency of the charging signal. Among them, the preset mapping relationship includes the mapping relationship between different RF tags, different frequencies of the charging signal, and different transmission durations of the charging signal. The transmission duration of the charging signal corresponding to the RF tag should ensure that the RF tag can complete charging. The above preset mapping relationship can be determined based on experiments or calculations. In this embodiment, the transmission durations of the charging signal in different communication processes can be different. In this way, it can be ensured that the RF signal transmitting device can flexibly set the transmission duration of the charging signal according to the RF tag, avoiding energy waste.
[0046] In still some other embodiments, the RF signal transmitting device can also obtain a notification message, which is used to notify that the target RF tag has entered the working state, and the RF signal transmitting device stops transmitting the charging signal according to this notification message.
[0047] S302. The target RF tag in at least one RF tag charges itself based on the charging signal and enters the working state.
[0048] The resonant frequency of the impedance matching circuit in the target RF tag matches the frequency of the charging signal. The matching means that the difference between the resonant frequency of the impedance matching circuit in the target RF tag and the frequency of the charging signal is less than a preset value, which is set based on experiments or experience. Further, the resonant frequency of the impedance matching circuit in the target RF tag is equal to the frequency of the charging signal.
[0049] In some embodiments, the target RF tag includes an antenna, a charging circuit, and a processing chip. The antenna is electrically connected to the charging circuit, and the charging circuit is electrically connected to the processing chip. In this embodiment, S202 is implemented as follows: The antenna converts the charging signal into an electrical signal; the charging circuit charges based on the charging signal; when the voltage of the charging circuit is greater than a second preset voltage, the processing chip powers on and enters the working state.
[0050] The charging circuit includes an impedance matching circuit, a rectifying and voltage - doubling circuit, and an energy storage element. The impedance matching circuit has a resonant frequency that allows AC signals in a specified frequency band containing this resonant frequency to pass through and blocks AC signals outside the specified frequency band. The rectifying and voltage - doubling circuit is used to convert the AC signal into a DC signal and double the voltage of the DC signal. The energy storage element is used to store electrical energy. When the voltage of the energy storage element (i.e., the voltage of the charging circuit) is greater than the second preset voltage, the processing chip powers on and enters the working state.
[0051] The second preset voltage is greater than the working voltage of the processing chip. Optionally, the second preset voltage can be a fixed value or dynamically adjusted. Exemplarily, the RF signal transmitting device can estimate the communication duration based on the number of instructions issued in the current communication process. The second preset voltage should ensure that the voltage of the charging circuit is still greater than or equal to the working voltage of the processing chip after discharging for the above - mentioned communication duration to avoid communication interruption.
[0052] Optionally, the energy storage element is a capacitor. Further, the charging time constant of the energy storage element is a first constant, and the discharging time constant of the energy storage element is a second constant. The first constant is less than the second constant, and the difference between them is greater than a preset difference. In this way, it can be ensured that the energy storage element can reach the above - mentioned second preset voltage quickly during charging and will not cause the voltage of the charging circuit to be lower than the startup voltage of the processing chip due to too fast discharging. The first constant and the second constant are set based on experiments or experience. Exemplarily, the first constant is 10 ms and the second constant is 100 ms.
[0053] S303, the RF signal transmitting device sends a target instruction.
[0054] The target instruction is used to instruct the RF tag to obtain relevant information of the vehicle and report it. For example, obtain the location information of the vehicle, obtain the parking space information where the vehicle is parked, obtain the power information of the vehicle, the dwell time information, and so on.
[0055] The target instruction is a modulated sine carrier signal, and the frequency of the sine carrier signal also matches the resonant frequency of the impedance matching circuit in the target RF tag. The modulation methods include but are not limited to: PWM modulation method, OOK modulation method. The method for the RF signal transmitting device to modulate the target instruction will be described in the following embodiments.
[0056] Correspondingly, the target RF tag receives the target instruction.
[0057] S304, the target RF tag parses and executes the target instruction.
[0058] The target RF tag receives the target instruction through the antenna, then parses the target instruction through the processing chip, and finally executes the target instruction. The specific process will be described in the following embodiments.
[0059] S305, the RF signal transmitting device transmits a carrier signal.
[0060] The carrier signal is used for the target RF tag to feedback the execution result of the target instruction in a backscatter communication manner, and the frequency of the carrier signal also matches the resonant frequency of the impedance matching circuit in the target RF tag.
[0061] The RF signal transmitting device can transmit the carrier signal immediately after the target instruction is sent, or can transmit the carrier signal after a preset time length after the target instruction is sent. The embodiments of the present application do not limit this.
[0062] S306, the target RF tag transmits the execution result of the target instruction based on the carrier signal.
[0063] The target RF tag transmits the execution result of the target instruction in a backscatter manner based on the carrier signal. The specific process will be described in the following embodiments.
[0064] Correspondingly, the RF signal receiving device receives the execution result of the target instruction.
[0065] In summary, for the technical solution provided by the embodiment of the present application, the radio frequency signal transmitting device first sends an energizing signal to the target radio frequency tag so that the target radio frequency tag enters the working state after being energized, and then sends a target instruction to the target radio frequency tag, and sends a carrier signal to the target radio frequency tag. After the target radio frequency tag executes the target instruction, it sends the instruction execution result of the target instruction outward based on the carrier signal. In the embodiment of the present application, the communication process between the vehicle and the parking lot is initiated by the radio frequency signal transmitting device provided in the parking lot, which can avoid the problem that the communication system is complex due to too many vehicles initiating communication at the same time, thereby improving the communication stability between the vehicle and the parking lot. In addition, the target radio frequency tag is energized and works based on the energizing signal sent by the radio frequency signal transmitting device without consuming the vehicle energy.
[0066] Please refer to Figure 4 , which shows a flowchart of a wireless communication method provided by an embodiment of the present application. This method is applied to Figure 1 the wireless communication system shown in Figure 3 In the optional embodiment provided by the embodiment shown in
[0067] S401, the radio frequency signal transmitting device sends an energizing signal.
[0068] S402, the target radio frequency tag among at least one radio frequency tag energizes itself based on the energizing signal and then enters the working state.
[0069] The resonant frequency of the impedance matching circuit in the target radio frequency tag matches the frequency of the energizing signal.
[0070] S403, the radio frequency signal transmitting device transmits the first specified bit in the target instruction with a first carrier signal and transmits the second specified bit in the target instruction with a second carrier signal.
[0071] The duration of the first carrier signal is the first duration, the duration of the second carrier signal is the second duration, and the time interval between the first carrier signal and the second carrier signal is the first duration, and the second duration is greater than the first duration.
[0072] Optionally, the first specified bit is bit "0" and the second specified bit is bit "1".
[0073] Optionally, the second duration is twice the first duration. For example, the first duration is T and the second duration is 2T.
[0074] That is, the radio frequency signal transmitting device transmits bit "0" through a sine carrier signal with a duration of T, transmits bit "1" through a sine carrier signal with a duration of 2T, and the time interval between the sine carrier signals for transmitting two bits is also T.
[0075] In the embodiment of the present application, when the radio frequency signal transmitting device transmits a target instruction, it performs PWM modulation on the target instruction using a preset PWM wave. In this way, the processing chip in the target radio frequency tag can decode the instruction information of the target instruction more quickly, thereby improving the communication efficiency.
[0076] As Figure 5 shown, Figure 5 part (a) in Figure 5 exemplarily shows the preset PWM wave, and part (b) in
[0077] exemplarily shows the target instruction modulated by the preset PWM wave.
[0078] S404. The target radio frequency tag parses the target instruction and executes the target instruction.
[0079] The target radio frequency tag rectifies and filters the target instruction to obtain a rectified and filtered signal. When the duration of the first signal segment in the rectified and filtered signal with a voltage greater than the first preset voltage is less than the preset duration, the target radio frequency tag decodes the first signal segment as the first specified bit. When the duration of the second signal segment in the rectified and filtered signal with a voltage greater than the first preset voltage is greater than the preset duration, the second signal segment is decoded as the second specified bit.
[0080] The first preset voltage and the preset duration are set according to experiments or experience. Optionally, the first specified bit is bit "0", and the second specified bit is bit "1".
[0081] Since after the antenna receives the target instruction, it converts it into an electrical signal, and the electrical signal is connected to the energy storage element after passing through the rectifying and voltage-doubling circuit. When the instruction information is bit "0", the voltage on the energy storage element will rise rapidly and last for a short time, and then fall back to a lower level; when the instruction information is bit "1", the voltage on the energy storage element will rise rapidly, last for a long time, and then fall back to a lower level; therefore, the processing chip can compare the duration of the high level, with the high level with a longer duration as bit "1" and the high level with a shorter duration as bit "0".
[0082] The process of the target RF tag executing the target instruction is specifically implemented as follows: sending an information acquisition instruction to the controller on the vehicle and receiving the data returned by the controller based on the information acquisition instruction as the execution result of the target instruction. The controller can communicate with the environmental perception system on the vehicle according to the information type indicated by the information acquisition instruction to obtain relevant data. For example, the controller communicates with the positioning module in the vehicle to obtain the current position information of the vehicle. For another example, the controller communicates with the temperature acquisition device in the vehicle to obtain the temperature information of the vehicle, and so on.
[0083] S405, the RF signal transmitting device transmits a carrier signal.
[0084] S406, the target RF tag controls its own impedance according to the execution result of the target instruction to adjust the reflection coefficient of the target RF tag, so as to send the execution result of the target instruction in the form of backscatter communication.
[0085] The reflection coefficient of the target RF tag refers to the ratio between the amplitude of the reflected signal and the amplitude of the incident signal. The value of the reflection coefficient of the target RF tag ranges from 0 to 1. When the reflection coefficient of the target RF tag is 0, it means that the amplitude of the signal after the carrier signal is reflected is 0, and the carrier signal is completely absorbed; when the reflection coefficient of the target RF tag is 1, it means that the amplitude of the signal after the carrier signal is reflected is the same as the amplitude of the carrier signal, and the carrier signal is completely reflected.
[0086] In some embodiments, for the first specified bit in the execution result of the target instruction, the target RF tag controls its own impedance to adjust the reflection coefficient of the target RF tag to a first coefficient. When the reflection coefficient of the target RF tag is the first coefficient, the target RF tag absorbs the carrier signal; for the second specified bit in the execution result of the target instruction, the target RF tag controls its own impedance to adjust the reflection coefficient of the target RF tag to a second coefficient. When the reflection coefficient of the target RF tag is the second coefficient, the target RF tag reflects the carrier signal.
[0087] Optionally, the first specified bit is bit "0", and the second specified bit is bit "1".
[0088] Optionally, the first coefficient is 0, and the second coefficient is 1.
[0089] The reflection coefficient of the target RF tag can be expressed by the following calculation formula:
[0090]
[0091] where Z L is the impedance of the target RF tag, Z S is the impedance of the antenna, and * is the conjugate symbol.
[0092] The target RF tag also includes an electronic switch, and the switch state of the electronic switch is used to indicate whether the impedance matching circuit is turned on. When the electronic switch is in the open state, the impedance matching circuit is in the on state. At this time, the reflection coefficient of the target RF tag is 0, and the carrier signal is completely absorbed without reflection. At this time, the RF signal receiving device can receive a lower signal amplitude, representing bit "0"; when the electronic switch is in the closed state, the impedance matching circuit is in the off state. At this time, the reflection coefficient of the target RF tag is 1, and the carrier signal is completely reflected. At this time, the RF signal receiving device receives a higher signal amplitude, representing bit "1". That is, the target RF tag controls its own impedance by controlling the switch state of the electronic switch to adjust the reflection coefficient of the target RF tag, so as to implement the execution result of the target instruction in the form of backscatter communication.
[0093] Before the target RF tag sends the execution result of the target instruction based on the carrier signal, the target RF tag can also modulate the execution result of the target instruction in a first preset modulation manner. The first preset modulation manner can be the OOK modulation manner or the PWM modulation manner. In the embodiments of the present application, only the case where the first preset modulation manner is the OOK modulation manner is taken as an example for illustration. The OOK modulation manner can bring higher communication stability and is simple to implement.
[0094] Correspondingly, the RF signal receiving device receives the execution result of the target instruction.
[0095] The RF signal receiving device can also analyze the execution result of the target instruction. Specifically, for the received RF signal, if the amplitude of the third signal segment is less than the preset amplitude, the third signal segment is decoded into a first specified bit, that is, bit "0", and if the amplitude of the fourth signal segment is greater than the preset amplitude, the fourth signal segment is decoded into a second specified bit, that is, bit "1".
[0096] When the RF signal receiving device is a reader-writer, the RF signal receiving device can also send data to the target RF tag. The data sending method can refer to the method of the RF signal sending device sending the target instruction to the target RF tag in S403, which will not be elaborated here.
[0097] In summary, for the technical solution provided in the embodiment of the present application, the radio frequency signal transmitting device first sends an energizing signal to the target radio frequency tag so that the target radio frequency tag enters the working state after being energized, and then sends a target instruction to the target radio frequency tag, and sends a carrier signal to the target radio frequency tag. After the target radio frequency tag executes the target instruction, it sends the instruction execution result of the target instruction outward based on the carrier signal. In the embodiment of the present application, the communication process between the vehicle and the parking lot is initiated by the radio frequency signal transmitting device provided in the parking lot, which can avoid the problem that the communication system is complicated due to too many vehicles initiating communication at the same time, thereby improving the communication stability between the vehicle and the parking lot. In addition, the target radio frequency tag is energized and operates based on the energizing signal sent by the radio frequency signal transmitting device, without consuming the vehicle's energy.
[0098] Please refer to Figure 6 , which shows the flowchart of the wireless communication method shown in an embodiment of the present application. This method is applied to Figure 1 the radio frequency tag in the embodiment. This method includes the following processes.
[0099] S601, energize itself based on the energizing signal sent by the radio frequency signal transmitting device, and then enter the working state.
[0100] In some embodiments, the target radio frequency tag includes an antenna, an energizing circuit, and a processing chip. The antenna is electrically connected to the energizing circuit, and the energizing circuit is electrically connected to the processing chip. In this embodiment, S601 is implemented as: the antenna converts the energizing signal into an electrical signal; the energizing circuit energizes based on the energizing signal; when the voltage of the energizing circuit is greater than the second preset voltage, the processing chip is powered on and enters the working state.
[0101] S602, receive the target instruction sent by the radio frequency signal transmitting device.
[0102] S603, analyze the target instruction.
[0103] In some embodiments, S603 is implemented as: rectify and filter the target instruction to obtain a rectified and filtered signal; when the duration for which the voltage of the first signal segment in the rectified and filtered signal is greater than the first preset voltage is less than the preset duration, decode the first signal segment into the first specified bit; when the duration for which the voltage of the second signal segment in the rectified and filtered signal is greater than the first preset voltage is greater than the preset duration, then decode the second signal segment into the second specified bit.
[0104] S604, execute the target instruction.
[0105] S605, send the execution result of the target instruction based on the carrier signal sent by the radio frequency signal transmitting device.
[0106] In some embodiments, S605 is implemented to control its own impedance according to the execution result of the target instruction, so as to adjust the reflection coefficient of the target radio frequency tag, and implement sending the execution result of the target instruction in the form of backscatter communication.
[0107] Specifically, for the first specified bit in the execution result of the target instruction, the target radio frequency tag controls its own impedance to adjust the reflection coefficient of the target radio frequency tag to a first coefficient. When the reflection coefficient of the target radio frequency tag is the first coefficient, the target radio frequency tag absorbs the carrier signal; for the second specified bit in the execution result of the target instruction, the target radio frequency tag controls its own impedance to adjust the reflection coefficient of the target radio frequency tag to a second coefficient. When the reflection coefficient of the target radio frequency tag is the second coefficient, the target radio frequency tag reflects the carrier signal.
[0108] In summary, for the technical solution provided by the embodiments of the present application, the radio frequency signal sending device first sends an energizing signal to the target radio frequency tag so that the target radio frequency tag enters the working state after being energized, and then sends the target instruction to the target radio frequency tag, and sends the carrier signal to the target radio frequency tag. After the target radio frequency tag executes the target instruction, it sends the instruction execution result of the target instruction outward based on the carrier signal. In the embodiments of the present application, the communication process between the vehicle and the parking lot is initiated by the radio frequency signal sending device set in the parking lot, which can avoid the problem that the communication system is complex due to too many vehicles initiating communication at the same time, thereby improving the communication stability between the vehicle and the parking lot. In addition, the target radio frequency tag is energized and works based on the energizing signal sent by the radio frequency signal sending device, without consuming the vehicle energy.
[0109] Please refer to Figure 7 which shows the flowchart of the wireless communication method shown in an embodiment of the present application. This method is applied to Figure 1 the radio frequency signal sending device in the embodiment. This method includes the following processes.
[0110] S701, send an energizing signal to the target radio frequency tag among at least one radio frequency tag.
[0111] S702, after the target radio frequency tag enters the working state, send a target instruction to the target radio frequency tag to instruct the target radio frequency tag to parse and execute the target instruction.
[0112] In some embodiments, S702 is implemented as: transmitting the first specified bit in the target instruction with a first carrier signal, transmitting the second specified bit in the target instruction with a second carrier signal, the duration of the first carrier signal is a first duration, the duration of the second carrier signal is a second duration, the time interval between the first carrier signal and the second carrier signal is a first duration, and the second duration is greater than the first duration.
[0113] S703. Send a carrier signal to the target RF tag to instruct the target RF tag to send the execution result of the target instruction based on the carrier signal.
[0114] In summary, for the technical solution provided in the embodiments of the present application, the RF signal sending device first sends an energizing signal to the target RF tag so that the target RF tag enters the working state after being energized. Then, the target instruction is sent to the target RF tag, and a carrier signal is sent to the target RF tag. After executing the target instruction, the target RF tag sends out the instruction execution result of the target instruction based on the carrier signal. In the embodiments of the present application, the communication process between the vehicle and the parking lot is initiated by the RF signal sending device set in the parking lot, which can avoid the problem of the complexity of the communication system caused by too many vehicles initiating communication simultaneously, thereby improving the stability of the communication between the vehicle and the parking lot. In addition, the target RF tag is energized and operates based on the energizing signal sent by the RF signal sending device, without consuming the vehicle's energy.
[0115] The embodiments of the present application further provide a wireless communication system, including: an RF signal sending device, at least one RF tag, and an RF signal receiving device. This wireless communication system is used to implement Figure 3 and Figure 4 each step in the embodiments.
[0116] The embodiments of the present application further provide an RF tag, and the RF tag is used to implement Figure 6 each step in the embodiments.
[0117] The embodiments of the present application further provide an RF signal sending device, and the RF signal sending device is used to implement Figure 7 each step in the embodiments.
[0118] The embodiments of the present application further provide a vehicle, and the vehicle includes an RF tag, and the RF tag is used to implement Figure 6 each step in the embodiments.
[0119] The embodiments of the present application further provide an electronic device, and the electronic device includes an RF signal sending device, and the RF signal sending device is used to implement Figure 7 each step in the embodiments.
[0120] Optionally, the electronic device further includes an RF signal receiving device.
[0121] The above are only the preferred embodiments of the present application, and do not impose any form of limitation on the present application. Although the present application has been disclosed above with the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present application. However, as long as it does not depart from the content of the technical solution of the present application, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application still fall within the scope of the technical solution of the present application.
Claims
1. A wireless communication method, characterized in that: include: The radio frequency signal sending device sends a charging signal; The target radio frequency tag in at least one radio frequency tag charges itself based on the charging signal and then enters a working state, and the resonant frequency of the impedance matching circuit in the target radio frequency tag matches the frequency of the charging signal; The radio frequency signal sending device sends a target instruction to the target radio frequency tag; The target radio frequency tag receives the target instruction, parses the target instruction, and executes the target instruction; The radio frequency signal sending device sends a carrier signal to the target radio frequency tag; The target radio frequency tag sends the execution result of the target instruction based on the carrier signal; The radio frequency signal receiving device receives the execution result of the target instruction.
2. The method according to claim 1, characterized in that The target radio frequency tag sends the execution result of the target instruction to the radio frequency signal receiving device based on the carrier signal, including: The target radio frequency tag controls its own impedance according to the execution result of the target instruction to adjust the reflection coefficient of the target radio frequency tag, so as to send the execution result of the target instruction in a backscatter communication manner.
3. The method according to claim 2, characterized in that The target radio frequency tag controls the impedance of the target radio frequency tag according to the execution result of the target instruction to adjust the reflection coefficient of the target radio frequency tag, so as to send the execution result of the target instruction in a backscatter communication manner, including: For a first designated bit in the execution result of the target instruction, the target radio frequency tag controls its own impedance to adjust the reflection coefficient of the target radio frequency tag to a first coefficient, and when the reflection coefficient of the target radio frequency tag is the first coefficient, the target radio frequency tag absorbs the carrier signal; For the second designated bit in the execution result of the target instruction, the target radio frequency tag controls its own impedance to adjust the reflection coefficient of the target radio frequency tag to a second coefficient. When the reflection coefficient of the target radio frequency tag is the second coefficient, the target radio frequency tag reflects the carrier signal.
4. The method according to claim 1, characterized in that: The target radio frequency tag parses the target instruction, including: The target radio frequency tag performs rectification and filtering on the target instruction to obtain a rectification and filtering signal; When the voltage of the first signal segment in the rectified and filtered signal is greater than the first preset voltage and the duration is less than the preset duration, the target radio frequency tag decodes the first signal segment into a first designated bit; When the duration of the voltage of the second signal segment in the rectified and filtered signal being greater than the first preset voltage is greater than the preset duration, the target radio frequency tag decodes the second signal segment into a second designated bit.
5. The method according to claim 1, characterized in that The target radio frequency tag includes an antenna, a charging circuit and a processing chip, wherein the antenna is electrically connected to the charging circuit, and the charging circuit is electrically connected to the processing chip; The target radio frequency tag in the at least one radio frequency tag charges itself based on the charging signal and then enters a working state, including: The antenna converts the charging signal into an electrical signal; The charging circuit performs charging based on the charging signal; When the voltage of the charging circuit is greater than a second preset voltage, the processing chip enters a working state after being powered on, and the second preset voltage is greater than or equal to the working voltage of the processing chip.
6. The method according to any one of claims 1 to 5, characterized in that The radio frequency signal sending device sends a target instruction to the target radio frequency tag, including: The radio frequency signal sending device transmits the first designated bit in the target instruction with a first carrier signal, and transmits the second designated bit in the target instruction with a second carrier signal, the duration of the first carrier signal is a first duration, the duration of the second carrier signal is a second duration, the time interval between the first carrier signal and the second carrier signal is the first duration, and the second duration is greater than the first duration.
7. A wireless communication method, characterized in that: Applied to radio frequency tags, the method comprises: The device charges itself based on the charging signal sent by the radio frequency signal sending device, and then enters the working state; receiving a target instruction sent by the radio frequency signal sending device; Parsing the target instruction; executing the target instruction; The execution result of the target instruction is sent based on the carrier signal sent by the radio frequency signal sending device.
8. A wireless communication method, characterized in that: Applied to a radio frequency signal transmitting device, the method comprises: sending a charging signal to a target radio frequency tag among at least one radio frequency tag; After the target radio frequency tag enters a working state, a target instruction is sent to the target radio frequency tag to instruct the target radio frequency tag to parse and execute the target instruction; A carrier signal is sent to the target radio frequency tag to instruct the target radio frequency tag to send an execution result of the target instruction based on the carrier signal.
9. A wireless communication system, characterized in that: include: A radio frequency signal transmitting device configured to transmit a charging signal; At least one radio frequency tag, including a target radio frequency tag, wherein the resonant frequency of the impedance matching circuit in the target radio frequency tag matches the frequency of the charging signal, and the target radio frequency tag is configured to charge itself based on the charging signal and then enter a working state; The radio frequency signal sending device is further configured to send a target instruction to the target radio frequency tag; The target radio frequency tag is further configured to receive the target instruction, parse the target instruction, and execute the target instruction; The radio frequency signal sending device is further configured to send a carrier signal to the target radio frequency tag; The target radio frequency tag is further configured to send the execution result of the target instruction based on the carrier signal; The radio frequency signal receiving device is configured to receive the execution result of the target instruction.
10. A radio frequency tag, characterized in that: The radio frequency tag is configured to: charge itself based on the charging signal sent by the radio frequency signal sending device, and then enter a working state; receive a target instruction sent by the radio frequency signal sending device; parse the target instruction; execute the target instruction; and send the execution result of the target instruction based on the carrier signal sent by the radio frequency signal sending device.
11. A radio frequency signal transmitting device, characterized in that: The radio frequency signal sending device is configured to: send a charging signal to a target radio frequency tag among at least one radio frequency tag, send a target instruction to the target radio frequency tag after the target radio frequency tag enters a working state, so as to instruct the target radio frequency tag to parse and execute the target instruction; and send a carrier signal to the target radio frequency tag, so as to instruct the target radio frequency tag to send the execution result of the target instruction based on the carrier signal.
12. A vehicle, characterized in that: The vehicle includes the radio frequency tag as claimed in claim 10.