Control method, radio frequency circuit and intelligent terminal

Abstract

The invention provides a control method, a radio frequency circuit and an intelligent terminal, and the method is applied to the radio frequency circuit, and comprises the steps: monitoring the transmission power and / or reflection power through a directional coupler; and when the transmitting power and / or the reflecting power meet a preset condition, controlling the transmitting power. According to the technical scheme, the specific absorption rate index function can be reduced, the human body approaching detection cost is reduced, the detection accuracy is improved, and then the user experience is improved.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a control method, a radio frequency circuit and an intelligent terminal. Background Art

[0002] SAR (Specific Absorption Rate) is the electromagnetic wave absorption ratio or specific absorption rate, which is the electromagnetic wave energy absorption ratio of wireless products such as mobile phones. Under the influence of external electromagnetic fields, the human body will generate an induced electromagnetic field, and the electromagnetic field in the body will generate an induced current, resulting in the absorption and dissipation of electromagnetic energy. In order to reduce SAR, the conventional practice is to add a SAR sensor chip to the terminal device. The SAR sensor determines whether the human body is close by monitoring the change in capacitance between the antenna and the terminal, thereby reducing the transmission power.

[0003] In the process of conceiving and implementing this application, the inventors found that there are at least the following problems: SAR sensor determines whether a human body is approaching by monitoring the change in capacitance, while the operating frequency of the RF signal is generally between 0.6-7GHz. The electrostatic field distribution of the capacitor and the RF signal radiation field distribution are not strongly correlated. When the SAR sensor determines that a human body is approaching, it does not necessarily absorb electromagnetic waves. Only when a human body is approaching in an area with a strong RF radiation field strength will there be a problem of SAR exceeding the standard. Although the SAR sensor can detect the approach of a human body, it is also easy to cause misjudgment, which will cause unnecessary reduction in RF signal strength and reduce the quality of uplink communications.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Summary of the invention

[0005] In response to the above technical problems, the present application provides a control method, a radio frequency circuit and an intelligent terminal, which can reduce the function of the specific absorption rate index, reduce the cost of human proximity detection, and improve the detection accuracy.

[0006] The present application provides a control method, which is applied to a radio frequency circuit, wherein the radio frequency circuit includes a directional coupler; the method includes the following steps:

[0007] S100: monitoring transmission power and / or reflection power through the directional coupler;

[0008] S200: When the transmission power and / or the reflection power meets a preset condition, control the transmission power.

[0009] Optionally, the step S100 includes at least one of the following:

[0010] S110: Detecting the transmission power of the radio frequency signal through the directional coupler;

[0011] S120: Control the detection direction of the directional coupler to perform periodic jumps to obtain the reflected power of the reflected signal.

[0012] Optionally, the step S110 further includes: sending the detection result of the transmission power to a radio frequency transceiver to form a closed-loop power detection of the radio frequency circuit.

[0013] Optionally, the step S120 includes:

[0014] Stop the closed-loop power detection; and / or control the transmit power to remain unchanged.

[0015] Optionally, before the step S120, the method further includes:

[0016] When the transmission power exceeds a preset threshold, the detection direction of the directional coupler is controlled to perform periodic hopping.

[0017] Optionally, the step S200 includes the following steps:

[0018] S210: Perform antenna tuning operation according to the ratio of the transmission power to the reflection power.

[0019] Optionally, the step S210 includes:

[0020] Controlling the directional coupler to detect phase and amplitude changes of the reflected signal and calculate antenna impedance data;

[0021] The antenna tuning parameters are changed accordingly according to the antenna impedance data.

[0022] Optionally, the preset condition includes at least one of the following:

[0023] The variation amplitude of the reflected power is greater than or equal to a first threshold;

[0024] The reflected power deviates from an average value within a preset time window and is greater than or equal to a second threshold;

[0025] The reflected power deviates from the initial detection value by a preset amplitude range and lasts for a preset time period;

[0026] A variation range of the ratio of the transmission power to the reflection power is greater than or equal to a third threshold.

[0027] The present application also provides a radio frequency circuit, the radio frequency circuit comprising a directional coupler, a radio frequency transceiver and a power amplifier;

[0028] The radio frequency transceiver transmits a radio frequency initial signal;

[0029] The power amplifier is connected to the radio frequency transceiver and is used to amplify the radio frequency initial signal to obtain a radio frequency signal;

[0030] The directional coupler is connected to the radio frequency transceiver and is used to detect the transmission power and / or reflection power of the radio frequency signal so that the radio frequency transceiver adjusts the radio frequency signal.

[0031] Optionally, the radio frequency circuit further includes a capacitance detection circuit, which is connected to the radio frequency transceiver and is used to detect the induced capacitance and send the detection result to the radio frequency transceiver.

[0032] Optionally, the capacitance detection circuit also includes a baseband processor, which is connected between the capacitance detection circuit and the RF transceiver, and is used to receive the capacitance value detected by the capacitance detection circuit, and generate a power control signal according to the capacitance value and send it to the RF transceiver.

[0033] Optionally, the radio frequency circuit further includes a transmitting antenna, which is connected to the power amplifier and is used to transmit signals according to the transmitting power of the power amplifier.

[0034] The present application also provides an intelligent terminal, including: a memory and a processor, wherein a control program is stored in the memory, and when the control program is executed by the processor, the steps of the control method in the above embodiment are implemented.

[0035] Optionally, the intelligent terminal includes the radio frequency circuit as described above.

[0036] The present application also provides a storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method described above are implemented.

[0037] As described above, the control method in the present application controls the directional coupler to detect the transmission power and / or reflection power of the RF signal in response to the RF circuit sending the RF signal; when the preset conditions are met, the directional coupler is controlled to adjust the transmission power. Through the above technical solution, human proximity detection can be realized, and the transmission power can be adjusted in time according to the size of the transmission power and / or reflection power, so that the terminal can adapt to the needs of the working environment in time, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0039] Figure 1 A schematic diagram of the hardware structure of a smart terminal for implementing various embodiments of the present application;

[0040] Figure 2 A communication network system architecture diagram provided for an embodiment of the present application;

[0041] Figure 3 is a flow chart of a control method according to the first embodiment;

[0042] Figure 4 This is a schematic diagram of the circuit structure of a directional coupler according to an embodiment of the present application;

[0043] Figure 5 A block diagram of a radio frequency circuit according to an embodiment of the present application;

[0044] Figure 6 is a schematic diagram of intelligent terminal circuit connection according to the second embodiment.

[0045] The realization of the purpose, functional features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. The above-mentioned drawings have shown clear embodiments of this application, which will be described in more detail later. These drawings and textual descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0046] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0047] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. Optionally, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context in the specific embodiment.

[0048] It should be understood that, although the terms first, second, third, etc. may be used to describe various information in this article, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this article, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination". Furthermore, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or", "and / or", "including at least one of the following" etc. used in this application can be interpreted as inclusive, or mean any one or any combination. For example, “comprising at least one of the following: A, B, C” means “any of the following: A; B; C; A and B; A and C; B and C; A and B and C”, and for another example, “A, B or C” or “A, B and / or C” means “any of the following: A; B; C; A and B; A and C; B and C; A and B and C”. An exception to this definition will only occur when a combination of elements, functions, steps or operations are inherently mutually exclusive in some manner.

[0049] It should be understood that, although the various steps in the flowchart in the embodiment of the present application are displayed in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and it can be performed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0050] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0051] It should be noted that in this article, step codes such as S10 and S20 are used for the purpose of expressing the corresponding content more clearly and concisely, and do not constitute a substantial limitation on the sequence. When implementing the step, those skilled in the art may execute S20 first and then S10, etc., but these should all be within the scope of protection of this application.

[0052] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0053] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application, and have no specific meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0054] The smart terminal may be implemented in various forms. For example, the smart terminal described in this application may include smart terminals such as mobile phones, tablet computers, laptop computers, PDAs, portable media players (PMPs), navigation devices, wearable devices, smart bracelets, pedometers, etc., as well as fixed terminals such as digital TVs and desktop computers.

[0055] The following description will be made by taking a mobile terminal as an example, and those skilled in the art will understand that, in addition to components specifically used for mobile purposes, the construction according to the embodiments of the present application can also be applied to fixed-type terminals.

[0056] See also Figure 1 , which is a schematic diagram of the hardware structure of a mobile terminal for implementing various embodiments of the present application, the mobile terminal 100 may include: RF (Radio Frequency, radio frequency) unit 101, WiFi module 102, audio output unit 103, A / V (audio / video) input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, processor 110, and power supply 111 and other components. Those skilled in the art can understand that Figure 1 The structure of the mobile terminal shown in the figure does not constitute a limitation on the mobile terminal. The mobile terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0057] Combine the following Figure 1 The following is a detailed introduction to the various components of the mobile terminal:

[0058] The radio frequency unit 101 can be used for receiving and sending signals during information transmission or communication. Specifically, after receiving the downlink information of the base station, it is sent to the processor 110 for processing; in addition, the uplink data is sent to the base station. Generally, the radio frequency unit 101 includes but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc. In addition, the radio frequency unit 101 can also communicate with the network and other devices through wireless communication. The above-mentioned wireless communications can use any communication standard or protocol, including but not limited to GSM (Global System of Mobile communication), GPRS (General Packet Radio Service), CDMA2000 (Code Division Multiple Access 2000), WCDMA (Wideband Code Division Multiple Access), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access), FDD-LTE (Frequency Division Duplexing-Long Term Evolution), TDD-LTE (Time Division Duplexing-Long Term Evolution) and 5G, etc.

[0059] WiFi is a short-range wireless transmission technology. Mobile terminals can help users send and receive emails, browse web pages, and access streaming media through WiFi module 102. It provides users with wireless broadband Internet access. Figure 1 The WiFi module 102 is shown, but it is understandable that it is not an essential component of the mobile terminal and can be omitted as required without changing the essence of the invention.

[0060] The audio output unit 103 can convert the audio data received by the RF unit 101 or the WiFi module 102 or stored in the memory 109 into an audio signal and output it as sound when the mobile terminal 100 is in a call signal reception mode, a talk mode, a recording mode, a voice recognition mode, a broadcast reception mode, etc. Moreover, the audio output unit 103 can also provide audio output related to a specific function performed by the mobile terminal 100 (for example, a call signal reception sound, a message reception sound, etc.). The audio output unit 103 may include a speaker, a buzzer, etc.

[0061] The A / V input unit 104 is used to receive audio or video signals. The A / V input unit 104 may include a graphics processor (GPU) 1041 and a microphone 1042, and the graphics processor 1041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The processed image frame can be displayed on the display unit 106. The image frame processed by the graphics processor 1041 can be stored in the memory 109 (or other storage medium) or sent via the radio frequency unit 101 or the WiFi module 102. The microphone 1042 can receive sound (audio data) via the microphone 1042 in a telephone call mode, a recording mode, a voice recognition mode, and other operating modes, and can process such sound into audio data. The processed audio (voice) data can be converted into a format output that can be sent to a mobile communication base station via the radio frequency unit 101 in the case of a telephone call mode. The microphone 1042 can implement various types of noise elimination (or suppression) algorithms to eliminate (or suppress) noise or interference generated in the process of receiving and sending audio signals.

[0062] The mobile terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Optionally, the light sensor includes an ambient light sensor and a proximity sensor. Optionally, the ambient light sensor can adjust the brightness of the display panel 1061 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 1061 and / or the backlight when the mobile terminal 100 is moved to the ear. As a type of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in all directions (generally three axes), and can detect the magnitude and direction of gravity when stationary. It can be used for applications that identify the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors that can be configured on the mobile phone, such as fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., they will not be repeated here.

[0063] The display unit 106 is used to display information input by the user or information provided to the user. The display unit 106 may include a display panel 1061, which may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.

[0064] The user input unit 107 can be used to receive input digital or character information, and to generate key signal input related to the user settings and function control of the mobile terminal. Optionally, the user input unit 107 may include a touch panel 1071 and other input devices 1072. The touch panel 1071, also known as a touch screen, can collect the user's touch operation on or near it (such as the user's operation on the touch panel 1071 or near the touch panel 1071 using any suitable object or accessory such as a finger, stylus, etc.), and drive the corresponding connection device according to a pre-set program. The touch panel 1071 may include two parts: a touch detection device and a touch controller. Optionally, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into the touch point coordinates, and then sends it to the processor 110, and can receive and execute the command sent by the processor 110. In addition, the touch panel 1071 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may further include other input devices 1072. Optionally, the other input devices 1072 may include, but are not limited to, one or more of a physical keyboard, a function key (such as a volume control key, a switch key, etc.), a trackball, a mouse, a joystick, etc., which are not specifically limited here.

[0065] Optionally, the touch panel 1071 may cover the display panel 1061. When the touch panel 1071 detects a touch operation on or near it, it transmits the information to the processor 110 to determine the type of touch event. Then, the processor 110 provides corresponding visual output on the display panel 1061 according to the type of touch event. Figure 1 In the figure, the touch panel 1071 and the display panel 1061 are used as two independent components to implement the input and output functions of the mobile terminal. However, in some embodiments, the touch panel 1071 and the display panel 1061 can be integrated to implement the input and output functions of the mobile terminal, which is not limited here.

[0066] The interface unit 108 serves as an interface through which at least one external device can be connected to the mobile terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device with an identification module, an audio input / output (I / O) port, a video I / O port, a headphone port, etc. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the mobile terminal 100 or may be used to transmit data between the mobile terminal 100 and an external device.

[0067] The memory 109 can be used to store software programs and various data. The memory 109 can mainly include a program storage area and a data storage area. Optionally, the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory 109 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0068] The processor 110 is the control center of the mobile terminal. It uses various interfaces and lines to connect various parts of the entire mobile terminal. It executes various functions of the mobile terminal and processes data by running or executing software programs and / or modules stored in the memory 109, and calling data stored in the memory 109, so as to monitor the mobile terminal as a whole. The processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor and a modem processor. Optionally, the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 110.

[0069] The mobile terminal 100 may also include a power supply 111 (such as a battery) for supplying power to various components. Preferably, the power supply 111 may be logically connected to the processor 110 via a power management system, thereby implementing functions such as charging, discharging, and power consumption management through the power management system.

[0070] although Figure 1 Not shown, the mobile terminal 100 may further include a Bluetooth module, etc., which will not be described in detail here.

[0071] In order to facilitate understanding of the embodiments of the present application, the communication network system on which the mobile terminal of the present application is based is described below.

[0072] See also Figure 2 , Figure 2 A communication network system architecture diagram is provided for an embodiment of the present application, wherein the communication network system is an LTE system of universal mobile communication technology, and the LTE system includes a UE (User Equipment) 201, an E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) 202, an EPC (Evolved Packet Core) 203 and an operator's IP service 204, which are connected in sequence for communication.

[0073] Optionally, UE201 may be the above-mentioned terminal 100, which will not be described in detail here.

[0074] E-UTRAN 202 includes eNodeB 2021 and other eNodeBs 2022 , etc. Optionally, eNodeB 2021 may be connected to other eNodeBs 2022 via a backhaul (eg, an X2 interface), and eNodeB 2021 is connected to EPC 203 , and eNodeB 2021 may provide UE 201 with access to EPC 203 .

[0075] EPC203 may include MME (Mobility Management Entity) 2031, HSS (Home Subscriber Server) 2032, other MMEs 2033, SGW (Serving Gate Way) 2034, PGW (PDN Gate Way) 2035 and PCRF (Policy and Charging Rules Function) 2036, etc. Optionally, MME 2031 is a control node that processes signaling between UE 201 and EPC 203, and provides bearer and connection management. HSS 2032 is used to provide some registers to manage functions such as home location register (not shown in the figure), and store some user-specific information such as service features and data rates. All user data can be sent through SGW2034, PGW2035 can provide IP address allocation and other functions for UE 201, PCRF2036 is the policy and charging control policy decision point for service data flow and IP bearer resources, which selects and provides available policy and charging control decisions for the policy and charging execution function unit (not shown in the figure).

[0076] The IP service 204 may include the Internet, an intranet, an IMS (IP Multimedia Subsystem) or other IP services.

[0077] Although the above introduction takes the LTE system as an example, those skilled in the art should know that the present application is not only applicable to the LTE system, but also to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA and future new network systems (such as 5G), etc., without limitation here.

[0078] Based on the above-mentioned mobile terminal hardware structure and communication network system, various embodiments of the present application are proposed.

[0079] First embodiment

[0080] The present application provides a control method. Figure 3 It is a flowchart of a control method according to the first embodiment.

[0081] See also Figure 3 In one embodiment, the control method is applied to a radio frequency circuit, and the radio frequency circuit includes a directional coupler. The control method includes steps S100 to S200, which are described in detail as follows:

[0082] Step S100: monitoring the transmission power and / or reflection power through the directional coupler.

[0083] Optionally, during the operation of the wireless terminal, the RF circuit sends a low-power signal to the power amplifier through the RF transceiver, and the power amplifier amplifies the signal and sends it to the directional coupler. Optionally, the directional coupler is a universal microwave / millimeter wave component that can be used for signal isolation, separation and mixing, such as power monitoring, source output power stabilization, signal source isolation, transmission and reflection sweep frequency testing, etc. The main technical indicators include directivity, standing wave ratio, coupling degree, and insertion loss. The directional coupler itself is used as a power feedback circuit in the RF circuit. It mainly includes two parts, the main line and the auxiliary line, which are coupled to each other through various forms of small holes, slits, gaps and other structures.

[0084] Optionally, Figure 4 FIG. 1 is a schematic diagram of the circuit structure of a directional coupler according to an embodiment of the present application. Figure 4As shown, the directional coupler has four ports, namely, end 1, end 2, end 3, and end 4. End 1 and end 2 are connected as the main line, and end 3 and end 4 are connected as the secondary line. During the operation of the directional coupler, part of the power input from the main line end "1" will be coupled to the secondary line. Due to the interference or superposition of waves, the power is transmitted in one direction along the secondary line, which can be represented as forward transmission S. The reflection coefficient Sii (i = 1, 2, 3, 4) of each port is very small (the ideal value is zero), indicating the matching of each port; the values ​​of coupling coefficients S12, S21, S34, and S43 are determined by the coupling degree during design; S14, S41, S23, and S32 are isolation coefficients, and the ideal value is zero. The main technical indicators of directional coupling are coupling degree C (decibel), directivity D (decibel) and working frequency band. In the process of quantifying the energy value of the directional coupler, according to the scattering matrix, the through parameter is characterized by the S21 eigenvector from the second end to the first end; the coupling parameter is characterized by the S31 eigenvector from the third end to the first end; the isolation parameter is characterized by the S41 eigenvector from the fourth end to the first end; and the reflection parameter is characterized by the S11 eigenvector from the first end to the first end. In the process of the wireless terminal sending the RF signal from the first end to the second end, due to the coupling effect from the third end to the first end, the transmission power energy of the RF signal can be detected through the third end of the directional coupler. Due to the impedance matching effect of the antenna tuning, part of the signal will be reflected back to the first end. At this time, the reflected power energy of the RF loop can be detected through the fourth end of the directional coupler.

[0085] Optionally, in response to the radio frequency circuit sending a radio frequency signal, the directional coupler is controlled to detect the transmission power and / or reflection power of the radio frequency signal.

[0086] Radio frequency signal usually refers to a high-frequency radio signal that can radiate into space. A directional coupler is a universal microwave or millimeter wave component that can be used for signal isolation, separation and mixing, such as power monitoring, source output power stabilization, signal source isolation, transmission and reflection frequency sweep testing, etc. Directional couplers are often used to sample microwave signals with a specified flow direction. When there is no internal load, a directional coupler is often a four-port network. Optionally, there are two common methods for implementing directional couplers. One is a coupled directional coupler, in which the length of the coupling zone is an integer multiple of one quarter, and the direct output and coupled output ports are not adjacent in structure. The output phase difference is often 90 degrees or 180 degrees. The remaining port is called the isolation port. In theory, the isolation port does not output any energy. The other is a branch line directional coupler, in which the two output ports are adjacent in structure, and the output phase difference can also be 90 degrees or 180 degrees, which is often used in strong coupling situations. Optionally, when the matching load is connected to each port outside the main line, the main line insertion loss includes energy coupling loss and energy dissipation loss. The difference between the output power of a coupled port when power is transmitted in a specified direction and the output power of the same coupled port when the same power is transmitted in the opposite direction. The maximum input power of the output port and the coupled port is determined by the coupling degree and the load resistance.

[0087] In this embodiment, through the coupling effect of the directional coupler, during the operation of the terminal, the coupled transmission power energy and the reflected power energy are monitored without the need for additional sensors, thereby effectively saving system costs.

[0088] Optionally, the detection direction of the directional coupler may be controlled to perform periodic jumps to detect the reflected power of the reflected signal.

[0089] Optionally, during the detection process, the directional coupler continuously feeds back the detected reflected power to the RF transceiver. The power in the transmitting direction and the power in the reflected direction are continuously and repeatedly detected by periodically jumping the detection direction of the directional coupler. Under normal circumstances, the transmitted signal and the reflected signal maintain a certain ratio unchanged. When a human body approaches, the reflection coefficient of the antenna changes. The baseband processor continuously compares the detection values ​​of the transmitted power and the reflected power to determine whether there is a human body approaching the antenna at this time. Optionally, when the transmitted power remains unchanged, when there is no human body approaching, the reflected power is relatively large, and when there is a human body approaching, the reflected power is relatively reduced.

[0090] Step S200: When the transmission power and / or reflection power meets a preset condition, the reflection power is controlled.

[0091] Optionally, in response to the reflected power and / or the reflected power meeting the preset condition, the transmit power can be reduced or increased, or the transmit power can be controlled to change periodically. Optionally, in response to detecting that the transmit power meets the preset condition, the transmit power is reduced or increased. In another embodiment, the transmit power and the reflected power can also be detected at the same time, so that when the preset condition is met, the transmit power is reduced or increased, so that the terminal can operate under appropriate power conditions.

[0092] Optionally, when it is detected that the transmission power and / or the reflected power is too small to meet the power requirement, the transmission power can be increased. When it is detected that the transmission power and / or the reflected power is too large and exceeds the upper limit of the power requirement, the transmission power can be reduced. Optionally, when a human body approaches a working terminal, the reflection coefficient of the antenna changes, and the ratio of the transmission signal to the reflected signal changes, so that it can be judged whether the human body is approaching. At this time, if the transmission power is too large, the transmission power can be reduced to achieve the effect of reducing SAR, so as to reduce the damage of electromagnetic wave radiation to the human body.

[0093] In this embodiment, the control method utilizes a directional coupler to repeatedly detect the transmission power and / or the reflection power, so as to make the human body approach detection more accurate and reduce the detection cost.

[0094] In one embodiment, the radio frequency circuit includes a radio frequency transceiver and a power amplifier.

[0095] Optionally, the step S100 includes at least one of the following:

[0096] S110: Detecting the transmission power and / or reflection power of the radio frequency signal through the directional coupler;

[0097] S120: Control the detection direction of the directional coupler to perform periodic jumps to obtain the reflected power of the reflected signal.

[0098] Optionally, the step S110 includes: after the radio frequency signal is amplified by the power amplifier, the transmission power is detected by the directional coupler, and the detection result is sent to the radio frequency transceiver to form a closed-loop power detection of the radio frequency circuit.

[0099] Optionally, the RF transceiver sends a small signal to the power amplifier PA, which is amplified by the power amplifier PA and sent to the directional coupler. The directional coupler detects the transmission power and / or reflected power and feeds back to the RF transceiver to form a closed-loop power control.

[0100] In one embodiment, the step S120 may include step S122 and / or step S124.

[0101] Optionally, the step S122 includes: stopping closed-loop power detection.

[0102] Optionally, in the transition state, the closed-loop power detection function of the power amplifier is suspended to avoid the impact of the transition on the power.

[0103] Optionally, the step S124 includes: controlling the transmission power to remain unchanged.

[0104] Optionally, when in the jump state, the transmission power remains unchanged to avoid the impact of the jump on the power.

[0105] In one embodiment, before executing the step of controlling the detection direction of the directional coupler to perform periodic hopping, the control method includes: when the transmission power exceeds a preset threshold, controlling the detection direction of the directional coupler to perform periodic hopping.

[0106] Optionally, when the transmit power exceeds a certain threshold and there may be a risk of SAR exceeding the standard, the directional coupler starts to perform periodic hopping to change the direction of the coupler detection. Optionally, when the transmit power is low and there is no risk of SAR exceeding the standard, the directional coupler can stop performing periodic hopping and the baseband processor stops performing comparative analysis.

[0107] In one embodiment, the preset condition may include: a variation amplitude of the reflected power is greater than or equal to a first threshold.

[0108] Optionally, when a human body approaches, the reflection coefficient of the antenna changes, and the amplitude of the reflected signal changes while the transmitted signal remains unchanged, so that it can be determined that the human body is approaching. At this time, if the transmission power is too large, the transmission power can be reduced to achieve a SAR reduction effect to reduce the damage of electromagnetic wave radiation to the human body. Optionally, in order to avoid misjudgment, it can be determined that the human body is approaching when the amplitude of the change in the reflected power reaches a first threshold.

[0109] In one embodiment, the preset condition in the control method may include: the reflected power deviates from an average value within a preset time window and is greater than or equal to a second threshold.

[0110] Optionally, when a human body approaches, the amplitude of the reflected signal is detected to change. If the reflected power deviates from the average value within the preset time window by a small amount, it may be a detection error or the human body temporarily approaches and then moves away from the RF circuit. Optionally, in order to avoid misjudgment, it can be set that when the reflected power deviates from the average value within the preset time window to reach a second threshold, it can be determined that a human body is approaching.

[0111] In one embodiment, the preset conditions in the control method may include: the reflected power deviates from the initial detection value by a preset amplitude interval and lasts for a preset time period.

[0112] Optionally, when a human body approaches, due to the change in the reflection coefficient of the antenna, the amplitude of the reflected signal changes while the transmitted signal remains unchanged, deviating from the initial detection value, and it can be determined that the human body is approaching. Optionally, in order to avoid misjudgment, it can be set that when the reflected power deviates from the initial detection value by a preset amplitude interval and lasts for a preset time, it is determined that the human body is approaching.

[0113] In one embodiment, the preset condition in the control method may include: the variation range of the ratio of the transmission power to the reflection power is greater than or equal to a third threshold.

[0114] Optionally, when a human body approaches, the reflection coefficient of the antenna changes, and the ratio of the transmitted signal to the reflected signal changes, so that it can be determined whether the human body is approaching. Optionally, in order to avoid misjudgment, it can be set that when the change amplitude of the ratio of the transmitted power to the reflected power reaches a third threshold, it is determined that the human body is approaching.

[0115] It should be noted that the present application does not limit the first threshold, the second threshold, the preset amplitude, the preset duration, and the third threshold, and the specific values ​​or thresholds can be determined according to the actual test results. For example, the parameter changes can be measured according to the distance between the human body and the terminal to determine the value of the relevant threshold, and the appropriate value can be further selected according to the accuracy required for human proximity detection.

[0116] In one embodiment, the radio frequency circuit further includes an antenna; the step S200 includes the following steps: Step S210: performing antenna tuning operation on the antenna according to the ratio of the transmission power and the reflected power.

[0117] An impedance matching network connecting the transmitter and the antenna is called an antenna tuner. It is generally referred to as an "antenna tuner". Generally speaking, the antenna input impedance changes greatly with frequency, while the transmitter output impedance is constant. If the transmitter is directly connected to the antenna, when the transmitter frequency changes, the impedance between the transmitter and the antenna does not match, which will reduce the radiated power. Optionally, when the transmitter frequency remains unchanged, but the impedance between the transmitter and the antenna changes due to the proximity of a human body, it will also cause an impedance mismatch problem. By tuning the antenna with an antenna tuner, the impedance between the transmitter and the antenna can be re-matched, so that the antenna has the maximum radiated power at any frequency. Optionally, when a human body approaches, the reflection coefficient of the antenna changes, and the baseband processor compares the transmission power and the reflected power to determine whether there is a human body approaching the antenna at this time. Optionally, if it is determined that a human body is approaching the antenna, the antenna can be tuned to achieve the effect of reducing SAR.

[0118] In one embodiment, the step S210 includes: controlling the directional coupler to detect the phase and amplitude changes of the reflected signal, and calculating the impedance data of the antenna; and changing the tuning state of the antenna accordingly according to the impedance data of the antenna.

[0119] Optionally, due to impedance mismatch, part of the signal will be reflected back to the directional coupler, and the impedance change of the antenna can be calculated through the phase and amplitude changes of the reflected signal to change the tuning state of the antenna accordingly.

[0120] As described above, the control method of this embodiment is applied to the radio frequency circuit, including: in response to the radio frequency circuit sending the radio frequency signal, controlling the directional coupler to detect the transmission power of the radio frequency signal; controlling the detection direction of the directional coupler to perform periodic jumps to detect the reflected power of the reflected signal; in response to the reflected power meeting the preset conditions, reducing the transmission power. Through the above technical solution, human proximity detection can be realized, the electromagnetic wave absorption ratio index function can be reduced, the cost of human proximity detection can be reduced, the detection accuracy can be improved, and the user experience can be improved.

[0121] Second embodiment

[0122] The present application also provides a radio frequency circuit, Figure 5 This is a block diagram of a radio frequency circuit according to an embodiment of the present application.

[0123] like Figure 5 The radio frequency circuit includes a directional coupler, a radio frequency transceiver and a power amplifier.

[0124] Optionally, the RF transceiver transmits an initial RF signal. The power amplifier is connected to the RF transceiver and is used to amplify the initial RF signal to obtain a RF signal. The directional coupler is connected to the RF transceiver and is used to detect the transmission power and / or reflected power of the RF signal and send it to the RF transceiver so that the RF transceiver adjusts the RF signal of the power amplifier.

[0125] Optionally, after powering on, the RF transceiver sends a small signal to the power amplifier, which amplifies the signal and sends the transmit power to the directional coupler. The directional coupler detects the transmit power and feeds it back to the RF transceiver, forming a closed-loop power control.

[0126] Optionally, when the transmit power exceeds a certain threshold and there may be a risk of SAR exceeding the standard, the directional coupler starts to make periodic jumps, changes the direction of the coupler detection, and feeds back the detected reflected power to the RF transceiver. In the jump state, the closed-loop power detection function of the PA is suspended, and the power remains unchanged to avoid the impact of the jump on the power.

[0127] Please continue to refer to Figure 5Optionally, the RF circuit also includes a capacitance detection circuit, which is connected to the RF transceiver and is used to detect the induced capacitance and send the detection result to the RF transceiver.

[0128] Optionally, the capacitance detection circuit also includes a baseband processor, which is connected between the capacitance detection circuit and the RF transceiver, and is used to receive the capacitance value detected by the capacitance detection circuit, and generate a power control signal according to the capacitance value and send it to the RF transceiver.

[0129] Optionally, when a human body approaches, the reflection coefficient of the antenna changes, and the baseband processor compares the transmission power and the reflection power to determine whether a human body is close to the antenna. If so, the input power of the PA is reduced to achieve the effect of reducing SAR. When the transmission power is low, there is no risk of SAR exceeding the standard, the directional coupler stops performing periodic jumps, and the baseband processor stops performing comparative analysis.

[0130] Optionally, the radio frequency circuit further includes a transmitting antenna, which is connected to the power amplifier and is used to transmit signals according to the transmitting power of the power amplifier.

[0131] Optionally, an impedance matching network connecting the transmitter and the antenna is called an antenna tuner. It is generally referred to as an "antenna tuner". Generally speaking, the antenna input impedance changes greatly with frequency, while the transmitter output impedance is constant. If the transmitter is directly connected to the antenna, when the transmitter frequency changes, the impedance between the transmitter and the antenna does not match, which will reduce the radiated power. Optionally, when the transmitter frequency remains unchanged, but the impedance between the transmitter and the antenna changes due to the proximity of the human body, it will also cause impedance mismatch problems. By tuning the antenna with an antenna tuner, the impedance between the transmitter and the antenna can be re-matched, so that the antenna has the maximum radiated power at any frequency. Optionally, when a human body approaches, the reflection coefficient of the antenna changes, and the baseband processor compares the transmission power and the reflected power to determine whether there is a human body approaching the antenna at this time. Optionally, if it is determined that a human body is approaching the antenna, the antenna can be tuned to achieve the effect of reducing SAR.

[0132] In one embodiment, the directional coupler is controlled to detect the phase and amplitude changes of the reflected signal, and the impedance data of the transmitting antenna is calculated; and the tuning state of the transmitting antenna is changed accordingly according to the impedance data of the transmitting antenna.

[0133] Third embodiment

[0134] The present application also provides an intelligent terminal, which includes a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the steps of the control method in any of the above embodiments are implemented.

[0135] On the other hand, the present application also provides a smart terminal, which includes the radio frequency circuit as described above.

[0136] Optionally, see Figure 5 After the smart terminal is turned on, the RF transceiver sends a small signal to the PA (power amplifier), which is amplified by the PA and sent to the directional coupler. The directional coupler detects the transmission power and feeds it back to the RF transceiver, forming a closed-loop power control.

[0137] When the transmission power of the smart terminal exceeds a certain threshold and there may be a risk of SAR exceeding the standard, the directional coupler starts to make periodic jumps, changes the direction of the coupler detection, and feeds back the detected reflected power to the RF transceiver. In the jumping state, the closed-loop power detection function of the PA is suspended, and the power remains unchanged to avoid the impact of the jump on the power. When a human body approaches, the reflection coefficient of the antenna changes, and the baseband processor compares the transmission power and the reflected power to determine whether there is a human body approaching the antenna at this time. If so, the input power of the PA is reduced to achieve the effect of reducing SAR. When the transmission power is low, there is no risk of SAR exceeding the standard, the directional coupler stops making periodic jumps, and the baseband processor stops doing comparative analysis.

[0138] Figure 6 FIG. 1 is a schematic diagram of a smart terminal circuit connection according to the second embodiment. Figure 6 , the steps of implementing the control method by the intelligent terminal through the directional coupler include:

[0139] Transmitted signal detection: The transmitter 1 (TX) of the transceiver transmits a small signal, which is amplified by 2 (PA, power amplifier) ​​and reaches 3 (directional coupler). 7 (DPDT switch) is in a direct connection state, so 4 (MRX, receiving end) detects the transmitted signal.

[0140] Reflected signal detection: 5 (antenna) is usually not 50ohm. After the signal is transmitted from 3 to 5, due to impedance mismatch, part of the signal will be reflected back to 3. When 7 is in the cross-connected state, 4 detects the reflected signal.

[0141] Under normal circumstances, the ratio of the transmitted signal to the reflected signal remains constant. When 6 (human body) approaches, the reflection coefficient of the antenna changes, and the ratio of the transmitted signal to the reflected signal changes, which can determine whether the human body is approaching.

[0142] In this embodiment, the intelligent terminal uses a coupler for reflected power detection instead of the SAR sensor to realize the human proximity sensing function. By adding a DPDT switch, it is more cost-effective and simpler in design compared to the SAR sensor, making the human proximity detection more accurate. The implementation principle of this embodiment is to use the change in the reflection coefficient of the antenna to determine whether the human body is approaching. When the human body is close to a position with a strong electromagnetic field intensity, a power reduction operation can be triggered. Optionally, when the human body is close to an area with a weak electromagnetic field intensity, there will be no obvious change in the antenna reflection coefficient, and the power reduction operation will not be triggered. The technical solution of the present application is more in line with the initial requirements of SAR testing.

[0143] Optionally, the smart terminal can also perform smart antenna tuning according to the change in reflection coefficient. When the antenna environment changes, the MRX detects the phase and amplitude changes of the reflected signal, calculates the impedance change of the antenna, and thus changes the tuning state of the antenna.

[0144] As described above, the intelligent terminal of this embodiment, through the control method applied to the radio frequency circuit, includes: in response to the radio frequency circuit sending the radio frequency signal, controlling the directional coupler to detect the transmission power of the radio frequency signal; controlling the detection direction of the directional coupler to make periodic jumps to detect the reflected power of the reflected signal; in response to the reflected power meeting the preset conditions, reducing the transmission power. Through the above technical solution, human proximity detection can be realized, the electromagnetic wave absorption ratio index function can be reduced, the cost of human proximity detection can be reduced, the detection accuracy can be improved, and the user experience can be improved.

[0145] The present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method in any of the above embodiments are implemented.

[0146] In the embodiments of the smart terminal and computer-readable storage medium provided in the present application, all technical features of any of the above-mentioned control method embodiments may be included, and the expanded and explained contents of the specification are basically the same as those of the embodiments of the above-mentioned methods, and will not be repeated here.

[0147] As described above, the RF control technical solution of the present application is applied to the RF circuit, including: in response to the RF circuit sending the RF signal, controlling the directional coupler to detect the transmission power of the RF signal; controlling the detection direction of the directional coupler to make periodic jumps to detect the reflected power of the reflected signal; in response to the reflected power meeting the preset conditions, reducing the transmission power. Through the above technical solution, human proximity detection can be realized, the electromagnetic wave absorption ratio index function can be reduced, the cost of human proximity detection can be reduced, the detection accuracy can be improved, and the user experience can be improved.

[0148] The embodiment of the present application further provides a computer program product, which includes a computer program code. When the computer program code runs on a computer, the computer executes the methods in the above various possible implementation modes.

[0149] An embodiment of the present application also provides a chip, including a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a device equipped with the chip executes the methods in various possible implementation modes as described above.

[0150] It is understood that the above scenarios are only examples and do not constitute a limitation on the application scenarios of the technical solutions provided in the embodiments of the present application. The technical solutions of the present application can also be applied to other scenarios. For example, it is known to those skilled in the art that with the evolution of the system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0151] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0152] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs.

[0153] The units in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0154] In the present application, the same or similar terminology concepts, technical solutions and / or application scenario descriptions are generally described in detail only the first time they appear. When they appear again later, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of the present application, for the same or similar terminology concepts, technical solutions and / or application scenario descriptions that are not described in detail later, reference can be made to the previous related detailed descriptions.

[0155] In the present application, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0156] The various technical features of the technical solution of the present application can be arbitrarily combined. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.

[0157] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as above, and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, a controlled terminal, or a network device, etc.) to execute the method of each embodiment of the present application.

[0158] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loading and executing computer program instructions on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can 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 can be transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, a data center, etc. that contains one or more available media integrated. The available medium can be a magnetic medium, (e.g., a floppy disk, a storage disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state storage disk Solid State Disk (SSD)), etc.

[0159] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method, characterized in that: Applied to a radio frequency circuit, the radio frequency circuit includes a directional coupler; the method includes the following steps: S100: monitoring transmission power and / or reflection power through the directional coupler; S200: When the transmission power and / or the reflection power meets a preset condition, control the transmission power.

2. The control method according to claim 1, characterized in that: The step S100 includes at least one of the following: detecting the transmission power of the radio frequency signal through the directional coupler; The detection direction of the directional coupler is controlled to perform periodic jumps to obtain the reflected power of the reflected signal.

3. The control method according to claim 1, characterized in that: The step S200 includes the following steps: S210: Perform antenna tuning operation according to the ratio of the transmission power to the reflection power.

4. According to the ratio of the transmission power to the reflection power, the step S210 includes: Controlling the directional coupler to detect phase and amplitude changes of the reflected signal and calculate antenna impedance data; The antenna tuning parameters are changed accordingly according to the antenna impedance data.

5. The control method according to any one of claims 1 to 4, characterized in that: The preset condition includes at least one of the following: The variation amplitude of the reflected power is greater than or equal to a first threshold; The reflected power deviates from an average value within a preset time window and is greater than or equal to a second threshold; The reflected power deviates from the initial detection value by a preset amplitude range and lasts for a preset time period; A variation range of the ratio of the transmission power to the reflection power is greater than or equal to a third threshold.

6. A radio frequency circuit, characterized in that: The radio frequency circuit includes a directional coupler, a radio frequency transceiver and a power amplifier; The radio frequency transceiver transmits a radio frequency initial signal; The power amplifier is connected to the radio frequency transceiver and is used to amplify the radio frequency initial signal to obtain a radio frequency signal; The directional coupler is connected to the radio frequency transceiver and is used to detect the transmission power and / or reflection power of the radio frequency signal so that the radio frequency transceiver adjusts the radio frequency signal.

7. The radio frequency circuit according to claim 6, characterized in that: The radio frequency circuit further includes a capacitance detection circuit, which is connected to the radio frequency transceiver and is used to detect the induced capacitance and send the detection result to the radio frequency transceiver.

8. The radio frequency circuit according to claim 7, characterized in that: The capacitance detection circuit also includes a baseband processor, which is connected between the capacitance detection circuit and the RF transceiver and is used to receive the capacitance value detected by the capacitance detection circuit and generate a power control signal according to the capacitance value and send it to the RF transceiver.

9. The radio frequency circuit according to any one of claims 6 to 8, characterized in that: The radio frequency circuit also includes a transmitting antenna, which is connected to the power amplifier and is used to transmit signals according to the transmitting power of the power amplifier.

10. An intelligent terminal, characterized in that: include: A memory and a processor, wherein a control program is stored on the memory, and when the control program is executed by the processor, the steps of the control method according to any one of claims 1 to 5 are implemented; and / or, The intelligent terminal comprises the radio frequency circuit according to any one of claims 6 to 9.

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