CN108601073A - Reduce method, mobile terminal and the computer readable storage medium of SAR - Google Patents

Abstract

The present invention relates to a method for reducing SAR, a mobile terminal and a computer-readable storage medium, including a first antenna, a second antenna, a first distance measuring device and a second distance measuring device, and the first distance measuring device is arranged on the mobile terminal On the first side, the second ranging device is disposed on the second side of the mobile terminal opposite to the first side. The first ranging device detects the distance between the user's head and the mobile terminal, and when the distance between the user's head and the mobile terminal is less than or equal to the preset head distance threshold, the first distance of the work is reduced according to the head back-off parameter. The transmit power of an antenna. The second ranging device detects the distance between the user's body and the mobile terminal, and when the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold, reduces the emission of the working second antenna according to the body back-off parameter power. Therefore, the SAR value of the mobile terminal can be effectively reduced without affecting the OTA performance of the mobile terminal through the first distance measuring device and the second distance measuring device.

Description

Method for reducing SAR, mobile terminal and computer-readable storage medium

technical field

The invention relates to the technical field of mobile terminal radiation adjustment, in particular to a method for reducing SAR, a mobile terminal and a computer-readable storage medium.

Background technique

SAR (Specific Absorption Rate) is the electromagnetic wave absorption ratio or specific absorption rate, which is defined as the electromagnetic power absorbed or consumed by human tissue per unit mass, and the unit is W/kg. Under the action of an external electromagnetic field, an induced electromagnetic field will be generated in the human body. Since various organs of the human body are lossy media, the electromagnetic field in the body will generate currents, resulting in the absorption and dissipation of electromagnetic energy. The SAR value generally refers to the heat energy generated by electromagnetic waves in mobile phones or wireless products, which is a measure of the impact on the human body. The greater the thermal energy value of the mobile phone, the greater the impact on the human body; otherwise, the less impact. At present, the safety standard value of mobile phones announced by the Federal Communications Commission (FCC) in the United States is 1.6W/kg, so as long as the SAR value of mobile phones is below 1.6W/kg, they are all products within the safety standards. The safety standard value of mobile phones announced by the European Union is 2.0W/kg.

A mobile phone antenna is an antenna installed on a mobile phone to receive and transmit signals from a transceiver. At present, in order to pursue fashionable appearance, comprehensive functions and convenient portability of mobile phones, the antenna space of mobile phones is continuously compressed, which makes the radiation hotspots of the antenna more and more concentrated, resulting in higher and higher SAR values of mobile phones. With the continuous development of 4G communication, 4G has become the standard configuration of mobile phones, especially the continuous update of LTE Advanced, the application of multi-antenna technology, main diversity antenna technology and MIMO technology on mobile phones is becoming more and more mature, and the communication capabilities of mobile phones more and more powerful. However, the increase of mobile phone antennas also increases the risk of mobile phone radiation to the human body. In addition, considering the scenarios where WIFI, Bluetooth and other antennas work at the same time, the SAR value of the mobile phone will be higher, and the radiation risk to the human body will be further increased. Therefore, how to solve the SAR problem of 4G mobile phones has become a new hot spot in the research of many terminal manufacturers.

At present, for the current 4G mobile phones, there are mainly two schemes to reduce SAR: 1) adjust the matching of the antenna, change the hotspot distribution or antenna radiation performance of the mobile phone antenna, so as to achieve the purpose of reducing the SAR value of the mobile phone antenna, but this kind of scheme Although the purpose of reducing the SAR value of the mobile phone antenna can be achieved, it will inevitably increase the time for antenna debugging, which is equivalent to readjusting the antenna matching that has been debugged, which will increase the workload of the designer, prolong the product development cycle, and adjust the antenna. The matching will also reduce the OTA (Over-the-Air) performance of the mobile phone antenna to a certain extent; 2) By opening a hot spot (hot-spot) or directly reducing the RF output power, the SAR value of the mobile phone antenna below the specified safety standards. However, by directly reducing the RF output power, it will also reduce the OTA performance of the mobile phone antenna. At the same time, 3GPP has requirements for the lower limit of the RF output power. When the SAR value exceeds the standard, this solution cannot effectively solve the SAR value exceeding the standard. question.

Contents of the invention

Based on this, it is necessary to provide a method, a mobile terminal and a computer-readable storage medium that can effectively reduce the SAR value of the mobile phone without affecting the OTA performance of the mobile phone.

A method for reducing SAR, applied to a mobile terminal, the mobile terminal includes a first antenna, a second antenna, a first distance measuring device and a second distance measuring device, the first distance measuring device is arranged on the mobile terminal The first side of the mobile terminal, the second ranging device is provided on the second side of the mobile terminal opposite to the first side; the method includes:

The first ranging device detects the distance between the user's head and the mobile terminal, and when the distance between the user's head and the mobile terminal is less than or equal to a preset head distance threshold, according to the head The internal back-off parameter reduces the transmission power of the working first antenna, so as to meet the SAR value requirement of the mobile terminal on the head;

The second ranging device detects the distance between the user's body and the mobile terminal, and when the distance between the user's body and the mobile terminal is less than or equal to a preset body distance threshold, according to the body fallback parameter The transmit power of the working second antenna is reduced to meet the requirement of the mobile terminal on the SAR value of the body.

In one of the embodiments, it also includes:

Responding to the triggered network event, acquiring the current geographic location of the mobile terminal;

Acquiring SAR fallback parameters matching the geographic location, where the SAR fallback parameters include the head fallback parameters and the body fallback parameters.

In one of the embodiments, the step of obtaining the current geographic location of the mobile terminal includes:

Obtain the code of the cell where the mobile terminal is currently located;

The country code is obtained according to the code of the cell.

In one of the embodiments, after the step of reducing the transmit power of the working first antenna according to the head back-off parameter, it further includes:

The first distance measuring device detects the distance between the user's head and the mobile terminal;

When the distance between the user's head and the mobile terminal is greater than the preset head distance threshold, restore the transmit power of the working first antenna.

In one of the embodiments, the first antenna includes at least one of a cellular antenna and a WiFi antenna, and the distance between the user's head and the mobile terminal is less than or equal to a preset head distance threshold When , the step of reducing the transmitting power of the working first antenna according to the head back-off parameter includes:

If the cellular antenna is working and it is detected that the distance between the user’s head and the mobile terminal is less than or equal to the preset first head distance threshold, reduce the working cellular antenna according to the first head back-off parameter transmit power;

If the WiFi antenna works, when it is detected that the distance between the user's head and the mobile terminal is less than or equal to the preset second head distance threshold, the working WiFi antenna is reduced according to the second head fallback parameter transmit power;

If the cellular antenna and the WiFi antenna work at the same time, when it is detected that the distance between the user's head and the mobile terminal is less than or equal to the preset third head distance threshold, the third head fallback parameter is reduced The transmit power of at least one of the active cellular antenna and the WiFi antenna.

In one of the embodiments, after the step of reducing the transmission power of the working second antenna according to the body retreat parameter, it further includes:

The second distance measuring device detects the distance between the user's body and the mobile terminal;

When the distance between the user's body and the mobile terminal is greater than the preset body distance threshold, restore the transmit power of the working second antenna.

In one of the embodiments, the second antenna includes at least one of a cellular antenna and a WiFi antenna, and when the distance between the user's body and the mobile terminal is less than or equal to a preset body distance threshold, The step of reducing the transmit power of the operative second antenna according to the body back-off parameter comprises:

If the cellular antenna is working and it is detected that the distance between the user’s body and the mobile terminal is less than or equal to a preset first body distance threshold, reduce the transmit power of the working cellular antenna according to the first body back-off parameter ;

If the WiFi antenna is working, when it is detected that the distance between the user's body and the mobile terminal is less than or equal to the preset second body distance threshold, reduce the transmit power of the working WiFi antenna according to the second body back-off parameter ;

If the cellular antenna and the WiFi antenna are working at the same time, when it is detected that the distance between the user's body and the mobile terminal is less than or equal to the preset third body distance threshold, the working cellular antenna will be reduced according to the third body fallback parameter. The transmission power of at least one of the antenna and the WiFi antenna.

On the other hand, the present invention also proposes a mobile terminal, including:

first antenna;

second antenna;

The first distance measuring device is arranged on the first side of the mobile terminal, and is used to detect the distance between the user's head and the mobile terminal, and generate a head distance signal;

The second distance measuring device is arranged on the second side of the mobile terminal opposite to the first side, and is used to detect the distance between the user's body and the mobile terminal, and generate a body distance signal;

A control module, configured to receive the head distance signal and the body distance signal, and when the distance between the user's head and the mobile terminal is less than or equal to a preset head distance threshold, according to the head back-off parameter The first antenna that controls the work reduces the transmission power to meet the SAR value requirement of the mobile terminal for the head; when the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold , controlling the operating second antenna to reduce transmit power according to the body back-off parameter, so as to meet the SAR value requirement of the mobile terminal on the body.

In one of the embodiments, the first ranging device includes a distance sensor, and the second ranging device includes a SAR sensor.

In another aspect, the present invention also proposes a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method described in any one of the above-mentioned embodiments are implemented. .

The above method for reducing SAR is applied to a mobile terminal. The mobile terminal includes a first antenna, a second antenna, a first distance measuring device and a second distance measuring device. The first distance measuring device is arranged on the first side of the mobile terminal, and the second The distance measuring device is arranged on a second side opposite to the first side of the mobile terminal. The first ranging device detects the distance between the user's head and the mobile terminal, and when the distance between the user's head and the mobile terminal is less than or equal to the preset head distance threshold, the first distance of the work is reduced according to the head back-off parameter. The transmit power of one antenna is to meet the SAR value requirement of the mobile terminal for the head. The second ranging device detects the distance between the user's body and the mobile terminal, and when the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold, reduces the emission of the working second antenna according to the body back-off parameter Power to meet the SAR value requirements of the mobile terminal on the body. Therefore, the SAR value of the mobile terminal can be effectively reduced without affecting the OTA performance of the mobile terminal through the first distance measuring device and the second distance measuring device.

Description of drawings

Fig. 1 is the flowchart of the method for reducing SAR in an embodiment;

Fig. 2 is the flowchart of the method for reducing SAR in another embodiment;

Fig. 3 is the flowchart of the method for reducing SAR in another embodiment;

Fig. 4 is a schematic diagram of the position of the antenna of the mobile terminal in an embodiment;

Fig. 5 is a schematic diagram of the location of the antenna of the mobile terminal in another embodiment.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. A preferred embodiment of the invention is shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1 , FIG. 1 is a flowchart of a method for reducing SAR in an embodiment.

In this embodiment, the method for reducing SAR is applied to a mobile terminal. The mobile terminal includes a first antenna, a second antenna, a first distance measuring device, and a second distance measuring device. The first distance measuring device is arranged on the second On one side (for example, the top of the mobile terminal), the second ranging device is provided on the second side of the mobile terminal opposite to the first side (for example, the bottom of the mobile terminal). The human body includes the head and the body. The head backoff parameter and the body backoff parameter have been stored in the mobile terminal in advance. The head backoff parameter refers to the power value that the first antenna needs to reduce, in dBm; the body backoff parameter is It refers to the power value that needs to be reduced by the second antenna, and the unit is dBm.

The method of reducing SAR includes:

S100. The first distance measuring device detects the distance between the user's head and the mobile terminal.

The first distance measuring device detects the distance between the user's head and the mobile terminal. If the distance between the user's head and the mobile terminal is less than or equal to the preset head distance threshold, go to step S200. In one embodiment, the first antenna includes at least one of a cellular antenna and a WiFi antenna. In one embodiment, the first side of the mobile terminal is the side designed to be upward when the user holds and uses it, that is, the top of the mobile terminal, and the second side of the mobile terminal is the side that is designed to be downward when the user holds and uses it. , which is the bottom of the mobile terminal.

S200. Reduce the transmit power of the working first antenna according to the head backoff parameter.

The transmitting power of the working first antenna is reduced according to the head back-off parameter, so as to meet the requirement of the mobile terminal on the SAR value of the head.

S300. The second distance measuring device detects the distance between the user's body and the mobile terminal.

Step S100 and step S300 are executed in parallel. The second distance measuring means detects the distance between the user's body and the mobile terminal. If the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold, go to step S400.

S400, reducing the transmit power of the working second antenna according to the body retreat parameter.

The transmit power of the working second antenna is reduced according to the body fallback parameter to meet the SAR value requirement of the mobile terminal on the body.

The above method for reducing SAR is applied to a mobile terminal. The mobile terminal includes a first antenna, a second antenna, a first distance measuring device and a second distance measuring device. The first distance measuring device is arranged on the first side of the mobile terminal, and the second The distance measuring device is arranged on a second side opposite to the first side of the mobile terminal. The first ranging device detects the distance between the user's head and the mobile terminal, and when the distance between the user's head and the mobile terminal is less than or equal to the preset head distance threshold, the first distance of the work is reduced according to the head back-off parameter. The transmit power of one antenna is to meet the SAR value requirement of the mobile terminal for the head. The second ranging device detects the distance between the user's body and the mobile terminal, and when the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold, reduces the emission of the working second antenna according to the body back-off parameter Power to meet the SAR value requirements of the mobile terminal on the body. Therefore, the SAR value of the mobile terminal can be effectively reduced without affecting the OTA performance of the mobile terminal through the first distance measuring device and the second distance measuring device.

Referring to FIG. 2 , FIG. 2 is a flowchart of a method for reducing SAR in another embodiment.

In this embodiment, the method for reducing SAR is applied to a mobile terminal. The mobile terminal includes a first antenna, a second antenna, a first distance measuring device, and a second distance measuring device. The first distance measuring device is arranged on the second On one side, the second ranging device is disposed on the second side of the mobile terminal opposite to the first side. The human body includes the head and the body. The head backoff parameter and the body backoff parameter have been stored in the mobile terminal in advance. The head backoff parameter refers to the power value that the first antenna needs to reduce, in dBm; the body backoff parameter is It refers to the power value that needs to be reduced by the second antenna, and the unit is dBm.

The method of reducing SAR includes:

S100. The first distance measuring device detects the distance between the user's head and the mobile terminal.

The first distance measuring device detects the distance between the user's head and the mobile terminal. If the distance between the user's head and the mobile terminal is less than or equal to the preset head distance threshold, then enter step S200, if the distance between the user's head and the mobile terminal is greater than the preset head distance threshold, then enter step S200 S210. In one embodiment, the first antenna includes at least one of a cellular antenna and a WiFi antenna. In one embodiment, the first side of the mobile terminal is the side designed to be upward when the user holds and uses it, that is, the top of the mobile terminal, and the second side of the mobile terminal is the side that is designed to be downward when the user holds and uses it. , which is the bottom of the mobile terminal.

S200. Reduce the transmit power of the working first antenna according to the head backoff parameter.

The transmitting power of the working first antenna is reduced according to the head back-off parameter, so as to meet the requirement of the mobile terminal on the SAR value of the head. After step S200, return to step S100, the first ranging device continues to detect the distance between the user's head and the mobile terminal, if the distance between the user's head and the mobile terminal is less than or equal to the preset head distance threshold, enter Step S200, looping in sequence.

S210. Keep the transmit power of the working first antenna.

If the distance between the user's head and the mobile terminal is greater than the preset head distance threshold, then keep the transmit power of the first working antenna constant (this time keep the transmit power of the working first antenna constant relative to the step In S200, the transmitting power of the working first antenna is reduced), at this time, the distance between the user's head and the mobile terminal is relatively long, and the transmitting power of the first antenna meets the SAR value requirement of the mobile terminal for the head. After step S210, return to step S100, the first ranging device continues to detect the distance between the user's head and the mobile terminal, if the distance between the user's head and the mobile terminal is greater than the preset head distance threshold, then enter step S210 , and cycle in turn.

S300. The second distance measuring device detects the distance between the user's body and the mobile terminal.

Step S100 and step S300 are executed in parallel. The second distance measuring means detects the distance between the user's body and the mobile terminal. If the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold, then enter step S400; if the distance between the user's body and the mobile terminal is greater than the preset body distance threshold, then enter step S410.

S400, reducing the transmit power of the working second antenna according to the body retreat parameter.

The transmit power of the working second antenna is reduced according to the body fallback parameter to meet the SAR value requirement of the mobile terminal on the body. After step S400, return to step S300, the second ranging device continues to detect the distance between the user's body and the mobile terminal, if the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold, then enter step S400, cycle in turn.

S410, keep the transmitting power of the working second antenna.

If the distance between the user's body and the mobile terminal is greater than the preset body distance threshold, then keep the transmission power of the second antenna that works unchanged (the transmission power of the second antenna that keeps the work constant at this time is relative to step S400. In terms of reducing the transmitting power of the working second antenna), the distance between the user's body and the mobile terminal is relatively long at this time, and the transmitting power of the second antenna meets the SAR value requirement of the mobile terminal for the body. After step S410, return to step S300, the second ranging device continues to detect the distance between the user's body and the mobile terminal, if the distance between the user's body and the mobile terminal is greater than the preset body distance threshold, then enter step S410, and loop in turn .

Referring to FIG. 3 , FIG. 3 is a flowchart of a method for reducing SAR in yet another embodiment.

In this embodiment, the method for reducing SAR is applied to a mobile terminal. The mobile terminal includes a first antenna, a second antenna, a first distance measuring device, and a second distance measuring device. The first distance measuring device is arranged on the second On one side, the second ranging device is disposed on the second side of the mobile terminal opposite to the first side. The human body includes the head and the body. The head retraction parameters and the body retraction parameters have been stored in the mobile terminal in advance. The methods for reducing SAR include:

S110, in response to the triggered network event, acquire the code of the cell where the mobile terminal is currently located.

A network event is an event that can trigger a mobile terminal to search for a network. When a network event is triggered, the mobile terminal will respond to the network event and obtain the code of the cell where it is currently located (obtain its current geographic location). Mobile terminals include mobile devices such as mobile phones and tablet computers.

S120. Obtain a country code according to the code of the cell.

Each country or region corresponds to a country code, that is, the country code is unique, and the country code where the cell is located can be identified according to the code where the cell is located, and then the country where the cell is located can be identified.

S130. Acquire the SAR fallback parameter matching the country code.

The SAR fallback parameters matching the country code are stored in the mobile terminal in advance, and different countries correspond to different fallback parameters. The SAR fallback parameter refers to the power value that the antenna needs to reduce in order to meet the SAR standard, and the unit is dBm. The SAR fallback parameters include head fallback parameters and body fallback parameters. The head backoff parameter refers to the power value that needs to be reduced by the first antenna in order to meet the SAR standard, and the unit is dBm. The body backoff parameter refers to the power value of the second antenna that needs to be reduced in order to meet the SAR standard, and the unit is dBm. For example, if the mobile terminal is in a country or region that needs to be certified by the FCC (Federal Communications Commission, the United States Federal Communications Commission), such as the United States, then obtain the SAR fallback parameters that match the FCC; countries or regions, such as EU member states, obtain the SAR fallback parameters that match CE.

Both the first antenna and the second antenna include at least one of a cellular antenna and a WiFi antenna, and at least one of the cellular antenna and the WiFi antenna is operative. After obtaining the SAR fallback parameters matching the country code, enter step S140 and step S170 respectively, and step S140 and step S170 are executed in parallel.

S140. The first distance measuring device detects the distance between the user's head and the mobile terminal.

The first distance measuring device detects the distance between the user's head and the mobile terminal. If the distance between the user's head and the mobile terminal is less than or equal to the preset head distance threshold, go to step S150. Please refer to FIG. 4 and FIG. 5. In one embodiment, the first distance measuring device includes a distance sensor (such as P sensor), and detects the distance between the user's head and the mobile terminal through the distance sensor (such as P sensor) in the mobile terminal. The distance between them, the distance sensor (such as P sensor) is installed on the top of the mobile terminal.

S150. Reduce the transmit power of the working first antenna according to the head backoff parameter.

According to the head backoff parameter acquired in step S130, the transmit power of the working first antenna is reduced according to the head backoff parameter. The first antenna includes a cellular antenna and a WiFi antenna, and at least one of the cellular antenna and the WiFi antenna is operative.

In one embodiment, step S150 includes the following situations:

If only the cellular antenna works, when it is detected that the distance between the user's head and the mobile terminal is less than or equal to the preset first head distance threshold, the transmit power of the working cellular antenna is reduced according to the first head back-off parameter, so as to Meet the SAR value requirements of the mobile terminal when only the cellular antenna is working. The first header backoff parameter refers to a power value that needs to be reduced by the cellular antenna when only the cellular antenna is working, and the unit is dBm.

If only the WiFi antenna is working, when it is detected that the distance between the user's head and the mobile terminal is less than or equal to the preset second head distance threshold, the transmit power of the working WiFi antenna is reduced according to the second head back-off parameter, so as to Meet the SAR value requirements of the head of the mobile terminal when only the WiFi antenna is working. The second head fallback parameter refers to the power value that the WiFi antenna needs to reduce when only the WiFi antenna is working, and the unit is dBm.

If the cellular antenna and the WiFi antenna work at the same time, when it is detected that the distance between the user's head and the mobile terminal is less than or equal to the preset third head distance threshold, the working cellular antenna and WiFi antenna will be reduced according to the third head fallback parameter. The transmission power of at least one of the antennas is to meet the SAR value requirements of the head of the mobile terminal when the WiFi antenna and the cellular antenna work simultaneously. The third header backoff parameter refers to a power value that needs to be reduced by at least one of the cellular antenna and the WiFi antenna when the cellular antenna and the WiFi antenna work simultaneously, and the unit is dBm.

Please combine Figure 4 and Figure 5, in one embodiment, the cellular antenna includes 4, antenna 1, antenna 2, antenna 3 and antenna 4 are all cellular antennas, antenna 5 is GPS/WIFI antenna, antenna 6 is WIFI/Bluetooth Antenna, because the power of the Bluetooth antenna is very low, it hardly affects the SAR value of the overall mobile terminal, so it can be ignored when considering the SAR value of the overall mobile terminal. In one embodiment, antenna 1 and antenna 2 are main antennas supporting different frequency bands, and antenna 3 and antenna 4 are diversity antennas, but also have a transmitting function. Antenna 1 and antenna 3 support the same frequency band, and antenna 2 and antenna 4 support the same frequency band. In one embodiment, the frequency bands of the WIFI antenna include 2.4GHZ and 5GHZ. In Figure 4, any one of Antenna 1, Antenna 2, Antenna 3, Antenna 4, Antenna 5, and Antenna 6 will affect the SAR value of the mobile terminal on the head; any one of Antenna 1, Antenna 2, Antenna 5, and Antenna 6 Work will affect the SAR value of the mobile terminal to the body. The difference between Figure 5 and Figure 4 is that the positions of antenna 4 and antenna 6 have been exchanged, so that in Figure 5, antenna 4 not only affects the SAR value of the mobile terminal to the head, but also affects the SAR value of the mobile terminal to the body, and everything else is the same .

S160. The first distance measuring device detects the distance between the user's head and the mobile terminal.

After step 150, the first ranging device continues to detect the distance between the user's head and the mobile terminal. If the distance between the user's head and the mobile terminal is greater than the preset head distance threshold, it is equivalent to the distance between the user's head moving The terminal is far away, go to step S165.

S165, transmit power of the first antenna to resume work.

If the distance between the user's head and the mobile terminal is greater than the preset head distance threshold, the mobile terminal will restore the transmit power of the first antenna that was lowered in step S150, so that the transmit power of the first antenna that works will be restored. to the original initial value.

S170. The second distance measuring device detects the distance between the user's body and the mobile terminal.

The second distance measuring means detects the distance between the user's body and the mobile terminal. If the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold, go to step S180. Please combine Figure 4 and Figure 5, in one embodiment, the second ranging device includes a SAR sensor (SAR sensor), through the SAR sensor (SAR sensor) in the mobile terminal to detect the distance between the user's body and the mobile terminal, SAR The sensor (SAR sensor) is installed on the inside of the bottom of the mobile terminal. The SAR sensor is a capacitive sensor. When the user's body is close to the bottom of the mobile terminal (the four sides adjacent to the bottom), the capacitance value of the SAR sensor will change. , so as to determine the distance between the user's body and the mobile terminal through the capacitance value.

S180. Reduce the transmit power of the working second antenna according to the body retreat parameter.

According to the body retreat parameter acquired in step S130, the transmit power of the working second antenna is reduced according to the body retreat parameter. The second antenna includes a cellular antenna and a WiFi antenna, at least one of which works.

In one embodiment, step S180 includes the following situations:

If only the cellular antenna is working, when it is detected that the distance between the user's body and the mobile terminal is less than or equal to the preset first body distance threshold, the transmit power of the working cellular antenna is reduced according to the first body back-off parameter to meet the needs of the mobile terminal. The SAR value requirements for the body when only the cellular antenna is working. The first body backoff parameter refers to a power value that needs to be reduced by the cellular antenna when only the cellular antenna is working, and the unit is dBm.

If only the WiFi antenna is working, when it is detected that the distance between the user's body and the mobile terminal is less than or equal to the preset second body distance threshold, the transmit power of the working WiFi antenna is reduced according to the second body fallback parameter to meet the requirements of the mobile terminal. The SAR value requirements for the body when only the WiFi antenna is working. The second body fallback parameter refers to a power value that needs to be reduced by the WiFi antenna when only the WiFi antenna is working, and the unit is dBm.

If the cellular antenna and the WiFi antenna work at the same time, when it is detected that the distance between the user's body and the mobile terminal is less than or equal to the preset third body distance threshold, reduce at least one of the working cellular antenna and WiFi antenna according to the third body fallback parameter A high transmit power to meet the SAR value requirements of the mobile terminal on the body when the WiFi antenna and the cellular antenna work at the same time. The third body backoff parameter refers to a power value that needs to be reduced by at least one of the cellular antenna and the WiFi antenna when the cellular antenna and the WiFi antenna work simultaneously, and the unit is dBm.

Please combine Figure 4 and Figure 5, in one embodiment, the cellular antenna includes 4, antenna 1, antenna 2, antenna 3 and antenna 4 are all cellular antennas, antenna 5 is GPS/WIFI antenna, antenna 6 is WIFI/Bluetooth Antenna, because the power of the Bluetooth antenna is very low, it hardly affects the SAR value of the overall mobile terminal, so it can be ignored when considering the SAR value of the overall mobile terminal. In one embodiment, antenna 1 and antenna 2 are main antennas supporting different frequency bands, and antenna 3 and antenna 4 are diversity antennas, but also have a transmitting function. Antenna 1 and antenna 3 support the same frequency band, and antenna 2 and antenna 4 support the same frequency band. In one embodiment, the frequency bands of the WIFI antenna include 2.4GHZ and 5GHZ. In Figure 4, any one of Antenna 1, Antenna 2, Antenna 3, Antenna 4, Antenna 5, and Antenna 6 will affect the SAR value of the mobile terminal on the head; any one of Antenna 1, Antenna 2, Antenna 5, and Antenna 6 Work will affect the SAR value of the mobile terminal to the body. The difference between Figure 5 and Figure 4 is that the positions of antenna 4 and antenna 6 have been exchanged, so that in Figure 5, antenna 4 not only affects the SAR value of the mobile terminal to the head, but also affects the SAR value of the mobile terminal to the body, and everything else is the same .

S190. The second distance measuring device detects the distance between the user's body and the mobile terminal.

After step 180, the second ranging device continues to detect the distance between the user's body and the mobile terminal. If the distance between the user's body and the mobile terminal is greater than the preset body distance threshold, it means that the user's body is far away from the mobile terminal. , go to step S195.

S195, the transmit power of the second antenna to resume work.

If the distance between the user's body and the mobile terminal is greater than the preset body distance threshold, the mobile terminal will restore the transmission power of the second antenna that was lowered in step S180, so that the transmission power of the second antenna that is working will be restored to the original the initial value of .

In one embodiment, the method for satisfying the body SAR value in the U.S. Federal Communications Commission (FCC) also includes the following steps:

If the cellular antenna is working, when it is detected that the WiFi antenna is working (equivalent to turning on the WIFI hotspot), the transmitting power of the cellular antenna is reduced according to the body back-off parameter to meet the standard of the US Federal Communications Commission (FCC) body SAR value. That is, the working of the WiFi antenna is the condition for triggering the reduction of the transmission power of the cellular antenna. As long as it is detected that the WiFi antenna is working (equivalent to the opening of the WIFI hotspot), the transmission power of the cellular antenna will be reduced until it is detected that the WiFi antenna is turned off, and then the cellular antenna will be restored to its original state. the initial value of .

And for the method of satisfying the body limit SAR value in the U.S. Federal Communications Commission (FCC), also through step S170 to step S195, trigger by the second ranging device and then reduce the transmission power of the working antenna, only trigger the second measuring device The distance threshold from the device is not the same as in the European Union (CE).

The above method of reducing SAR, without affecting the OTA performance of the mobile terminal, obtains the country code by responding to the triggered network event, and then obtains the SAR fallback parameter matching the country code, and automatically reduces the work according to the trigger condition in the fallback parameter. The transmitting power of the antenna, and the transmitting power of the working antenna will be resumed when the trigger condition terminates, so as to realize the compatibility of SAR values in different countries, such as meeting the requirements of FCC/CE/IC (Industry Canada, Ministry of Industry Canada)/MIC (Korean Electrical Communications Act) Compatible with the Compulsory Certification for Information Communication Equipment and Various Radio Frequency Products)/OFCA (Office of Communications Authority, Hong Kong Communications Authority)/Tel Standard implemented by Radio Law, so as to effectively reduce the SAR of mobile terminals value, so that the mobile terminal can meet the SAR value requirements of different countries for the human body.

On the other hand, the present invention also proposes a mobile terminal, including: a first antenna, a second antenna, a first distance measuring device, a second distance measuring device and a control module, the human body includes a head and a body, and the head retraction parameter and body fallback parameters have been stored in the mobile terminal in advance.

The first distance measuring device is arranged on the first side of the mobile terminal, and is used for detecting the distance between the user's head and the mobile terminal, and generating a head distance signal.

The second distance measuring device is arranged on the second side of the mobile terminal opposite to the first side, and is used for detecting the distance between the user's body and the mobile terminal, and generating a body distance signal.

The control module is used to receive the head distance signal and the body distance signal. When the distance between the user's head and the mobile terminal is less than or equal to the preset head distance threshold, the first antenna that is controlled to work according to the head back parameter is lowered. Transmit power to meet the SAR value requirements of the mobile terminal on the head; when the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold, the second antenna that is controlled to work according to the body back-off parameter is reduced Transmit power to meet the SAR value requirements of the mobile terminal on the body.

The above-mentioned mobile terminal includes a first antenna, a second antenna, a first distance measuring device, a second distance measuring device and a control module, and the first distance measuring device is arranged on the first side of the mobile terminal for detecting the user's head and the mobile terminal. distance between them and generate a head distance signal. The second distance measuring device is arranged on the second side of the mobile terminal opposite to the first side, and is used for detecting the distance between the user's body and the mobile terminal, and generating a body distance signal. The control module is used to receive the head distance signal and the body distance signal. When the distance between the user's head and the mobile terminal is less than or equal to the preset head distance threshold, the first antenna that is controlled to work according to the head back parameter is lowered. Transmit power to meet the SAR value requirements of the mobile terminal on the head; when the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold, the second antenna that controls the work according to the body back-off parameter reduces the transmit power , to meet the requirements of the mobile terminal on the SAR value of the body. Therefore, the SAR value of the mobile terminal can be effectively reduced without affecting the OTA performance of the mobile terminal through the first distance measuring device, the second distance measuring device and the control module.

In one embodiment, the control module is also used to respond to the triggered network event, obtain the current geographic location of the mobile terminal, and then obtain the SAR fallback parameters that match the geographic location. The SAR fallback parameters include head fallback parameters and body fallback parameters. Return parameters. A network event is an event that can trigger the mobile terminal to search the network. When the network event is triggered, the control module will respond to the network event and obtain its current geographic location. Mobile terminals include mobile devices such as mobile phones and tablet computers. The SAR fallback parameters matched with the geographic location have been stored in the mobile terminal in advance, and different geographic locations correspond to different fallback parameters. The SAR fallback parameters include head fallback parameters and body fallback parameters. For example, if the mobile terminal is in a country or region that needs to be certified by the FCC (Federal Communications Commission, the United States Federal Communications Commission), such as the United States, then obtain the SAR fallback parameters that match the FCC; The certified countries or regions, such as EU member states, obtain the SAR fallback parameters that match CE.

In one embodiment, the control module is also used to respond to the triggered network event, obtain the code of the cell where the mobile terminal is currently located, obtain the country code according to the code of the cell, and then obtain the SAR fallback parameter matching the country code. A network event is an event that can trigger the mobile terminal to search the network. When the network event is triggered, the control module will respond to the network event and obtain the code of the cell where it is currently located (acquire the geographic location where it is currently located). Each country or region corresponds to a country code, that is, the country code is unique, and the country code of the cell can be identified according to the code of the cell, and then the country where the cell is located can be identified. The SAR fallback parameters matching the country code are stored in the mobile terminal in advance, and different countries correspond to different fallback parameters. The SAR fallback parameters include head fallback parameters and body fallback parameters. For example, if the mobile terminal is in a country or region that needs to be certified by the FCC (Federal Communications Commission, the United States Federal Communications Commission), such as the United States, then obtain the SAR fallback parameters that match the FCC; The certified countries or regions, such as EU member states, obtain the SAR fallback parameters that match CE.

In one embodiment, the first distance measuring device is used to detect the distance between the user's head and the mobile terminal, and generate a head distance signal to transmit to the control module. The control module is used to receive the head distance signal, and when the distance between the user's head and the mobile terminal is less than or equal to the preset head distance threshold, control the working first antenna to reduce the transmission power according to the head back-off parameter, To meet the requirements of the mobile terminal for the SAR value of the head; when the distance between the user's head and the mobile terminal is greater than the preset head distance threshold, the transmission power of the first antenna that controls the work remains unchanged (at this time the control The transmission power of the working first antenna remains unchanged (relative to the reduction of the transmission power of the first working antenna), at this time, the distance between the user’s head and the mobile terminal is relatively long, and the transmission power of the first antenna remains constant. The SAR value requirement of the mobile terminal for the head remains unchanged. Then, the first distance measuring device continues to detect the distance between the user's head and the mobile terminal, and generates a head distance signal and transmits it to the control module, and the cycle continues in turn.

The second distance measuring device is used to detect the distance between the user's body and the mobile terminal, and generate a body distance signal to transmit to the control module. The control module is used to receive the body distance signal, and when the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold, control the working second antenna to reduce the transmission power according to the body back-off parameter to meet the requirements of the mobile terminal. Requirements for the SAR value of the body; when the distance between the user's body and the mobile terminal is greater than the preset body distance threshold, the transmission power of the second antenna that controls the work remains unchanged (at this time, the transmission power of the second antenna that controls the work Keeping the power constant is relative to reducing the transmission power of the second antenna that controls the work), at this time, the distance between the user’s body and the mobile terminal is relatively long, and the transmission power of the second antenna remains unchanged to meet the requirements of the mobile terminal on the body. SAR value requirements. Then, the second distance measuring device continues to detect the distance between the user's body and the mobile terminal, and generates a body distance signal and transmits it to the control module, and the cycle continues in turn.

In one embodiment, the first distance measuring device is used to detect the distance between the user's head and the mobile terminal, and generate a head distance signal to transmit to the control module. The control module is used to receive the head distance signal, and when the distance between the user's head and the mobile terminal is less than or equal to the preset head distance threshold, control the working first antenna to reduce the transmission power according to the head back-off parameter, To meet the SAR value requirements of the mobile terminal on the head, the first ranging device continues to detect the distance between the user's head and the mobile terminal, and generates a head distance signal to transmit to the control module. The control module is used to receive the head distance signal, and when the distance between the user's head and the mobile terminal is greater than the preset head distance threshold, the first antenna that controls the work restores the transmission power to the original initial value (at this time the control Restoring the transmission power of the working first antenna to the original initial value is relative to controlling the reduction of the transmission power of the working first antenna).

The second distance measuring device is used to detect the distance between the user's body and the mobile terminal, and generate a body distance signal to transmit to the control module. The control module is used to receive the body distance signal, and when the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold, control the working second antenna to reduce the transmission power according to the body back-off parameter to meet the requirements of the mobile terminal. The SAR value of the body is required, and then the second ranging device continues to be used to detect the distance between the user's body and the mobile terminal, and generates a body distance signal and transmits it to the control module. The control module is used to receive the body distance signal, and when the distance between the user's body and the mobile terminal is greater than the preset body distance threshold, the second antenna that controls the work restores the transmission power to the original initial value (at this time, the second antenna that controls the work The restoration of the transmission power of the second antenna to the original initial value is relative to the reduction of the transmission power of the second antenna that is in control).

Please combine Figure 4 and Figure 5, in one embodiment, the cellular antenna includes 4, antenna 1, antenna 2, antenna 3 and antenna 4 are all cellular antennas, antenna 5 is GPS/WIFI antenna, antenna 6 is WIFI/Bluetooth Antenna, because the power of the Bluetooth antenna is very low, it hardly affects the SAR value of the overall mobile terminal, so it can be ignored when considering the SAR value of the overall mobile terminal. In one embodiment, antenna 1 and antenna 2 are main antennas supporting different frequency bands, and antenna 3 and antenna 4 are diversity antennas, but also have a transmitting function. Antenna 1 and antenna 3 support the same frequency band, and antenna 2 and antenna 4 support the same frequency band. In one embodiment, the frequency bands of the WIFI antenna include 2.4GHZ and 5GHZ.

Please refer to Fig. 4, in one embodiment, the first antenna includes any one of antenna 1, antenna 2, antenna 3, antenna 4, antenna 5 and antenna 6, antenna 1, antenna 2, antenna 3, antenna 4, antenna Any one of antenna 5 and antenna 6 works will affect the SAR value of the mobile terminal to the head; the second antenna includes any one of antenna 1, antenna 2, antenna 5 and antenna 6, and any one of antenna 1, antenna 2, antenna 5 and antenna 6 Work will affect the SAR value of the mobile terminal to the body. The difference between Figure 5 and Figure 4 is that the positions of antenna 4 and antenna 6 have been exchanged, so that in Figure 5, antenna 4 not only affects the SAR value of the mobile terminal to the head, but also affects the SAR value of the mobile terminal to the body, and everything else is the same .

In one embodiment, the first antenna includes a cellular antenna and a WiFi antenna, and at least one of the cellular antenna and the WiFi antenna is operative. When the distance between the user's head and the mobile terminal is less than or equal to the preset head distance threshold, the control module is used to control the working first antenna to reduce the transmission power according to the head back-off parameter, including:

If only the cellular antenna works, and the control module detects that the distance between the user's head and the mobile terminal is less than or equal to the preset first head distance threshold, the cellular antenna that is controlled to work according to the first head back-off parameter reduces the transmission power , to meet the SAR value requirements of the head of the mobile terminal when only the cellular antenna is working.

If only the WiFi antenna works, and the control module detects that the distance between the user's head and the mobile terminal is less than or equal to the preset second head distance threshold, the working WiFi antenna is controlled to reduce the transmission power according to the second head back-off parameter , to meet the SAR value requirements of the head of the mobile terminal when only the WiFi antenna is working.

If the cellular antenna and the WiFi antenna work at the same time, when the control module detects that the distance between the user's head and the mobile terminal is less than or equal to the preset third head distance threshold, control the working cellular antenna according to the third head fallback parameter and at least one of the WiFi antennas to reduce the transmission power to meet the SAR value requirements of the head of the mobile terminal when the WiFi antenna and the cellular antenna work simultaneously.

In one embodiment, the second antenna includes a cellular antenna and a WiFi antenna, and at least one of the cellular antenna and the WiFi antenna is operative. When the distance between the user's body and the mobile terminal is less than or equal to the preset body distance threshold, the control module is used to control the working second antenna to reduce the transmission power according to the body back-off parameter, including:

If only the cellular antenna works, and the control module detects that the distance between the user's body and the mobile terminal is less than or equal to the preset first body distance threshold, the cellular antenna that works is controlled according to the first body back-off parameter to reduce the transmission power to meet The mobile terminal requires the SAR value of the body when only the cellular antenna is working.

If only the WiFi antenna works, and the control module detects that the distance between the user's body and the mobile terminal is less than or equal to the preset second body distance threshold, the WiFi antenna that is controlled to work according to the second body back-off parameter reduces the transmission power to meet The mobile terminal requires the SAR value of the body when only the WiFi antenna is working.

If the cellular antenna and the WiFi antenna work at the same time, when the control module detects that the distance between the user's body and the mobile terminal is less than or equal to the preset third body distance threshold, control the working cellular antenna and WiFi antenna according to the third body fallback parameter At least one of them reduces the transmission power to meet the SAR value requirements of the mobile terminal on the body when the WiFi antenna and the cellular antenna work simultaneously.

In one embodiment, the first side of the mobile terminal is the side designed to be upward when the user holds and uses it, that is, the top of the mobile terminal, and the second side of the mobile terminal is the side that is designed to be downward when the user holds and uses it. , which is the bottom of the mobile terminal.

In one embodiment, the first ranging device includes a distance sensor (such as a P sensor), which detects the distance between the user's head and the mobile terminal through the distance sensor (such as a P sensor) in the mobile terminal, and generates a head For internal distance signals, a distance sensor (such as a P sensor) is installed on the top of the mobile terminal.

In one embodiment, the second ranging device includes a SAR sensor (SAR sensor), which detects the distance between the user's body and the mobile terminal through the SAR sensor (SAR sensor) in the mobile terminal, and the SAR sensor (SAR sensor) is installed on the bottom inside of the mobile terminal. The SAR sensor is a capacitive sensor. When the user's body is close to the bottom of the mobile terminal (the four sides adjacent to the bottom), the capacitance value of the SAR sensor will change, so as to judge the distance between the user's body and the mobile terminal by the capacitance value. distance.

In one embodiment, the control module includes a processor.

The above-mentioned mobile terminal includes a first antenna, a second antenna, a first distance measuring device, a second distance measuring device and a control module, the first distance measuring device is arranged on the first side of the mobile terminal, and is used to detect the user's head and the Move the distance between terminals and generate a head distance signal. The second distance measuring device is arranged on the second side of the mobile terminal opposite to the first side, and is used for detecting the distance between the user's body and the mobile terminal, and generating a body distance signal. The control module is used to respond to the triggered network event, obtain the code of the cell where the mobile terminal is currently located, obtain the country code according to the code of the cell, and then obtain the SAR fallback parameter matching the country code, receive the head distance signal and the body distance signal, According to the trigger condition in the fallback parameter, the transmit power of the working antenna is automatically reduced, and the transmit power of the working antenna is restored when the trigger condition terminates, so as to realize the compatibility of SAR values in different countries. For example, meet FCC/CE/IC (Industry Canada, Ministry of Industry Canada)/MIC (compulsory certification for information communication equipment, information communication equipment and various radio frequency products implemented by Korean Electrical Communication Law and Radio Wave Law)/OFCA (Office of Communications Authority, Hong Kong Communications Authority)/Tel standard compatibility, thereby effectively reducing the SAR value of the mobile terminal, so that the mobile terminal can meet the SAR value requirements of different countries for the human body.

In another aspect, the present invention also proposes a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method for reducing SAR in any of the above-mentioned embodiments are implemented.

The various technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. a kind of method reducing SAR, is applied to mobile terminal, which is characterized in that the mobile terminal includes first antenna, the Two antennas, the first range unit and the second range unit, first range unit are set to the first side of the mobile terminal, institute The second side opposite with first side that the second range unit is set to the mobile terminal is stated, the method includes：

First range unit detects the distance between user's head and the mobile terminal, in the user's head and described When the distance between mobile terminal is less than or equal to preset head distance threshold value, the of work is reduced according to head back-off parameter The transmission power of one antenna, to meet SAR value requirement of the mobile terminal to head；

Second range unit detects the distance between user's body and the mobile terminal, in the user's body and described When the distance between mobile terminal is less than or equal to preset body distance threshold, the of work is reduced according to body back-off parameter The transmission power of two antennas, to meet SAR value requirement of the mobile terminal to body.

2. the method according to claim 1 for reducing SAR, which is characterized in that further include：

The network event for responding triggering, obtains the current geographical location of the mobile terminal；

Obtain with the matched SAR back-off parameters in the geographical location, the SAR back-off parameters include the head back-off parameter and The body back-off parameter.

3. the method according to claim 2 for reducing SAR, which is characterized in that described to obtain the mobile terminal current The step of geographical location includes：

Obtain the coding for the cell that the mobile terminal is currently located；

National code is obtained according to the coding of the cell.

4. the method according to claim 1 for reducing SAR, which is characterized in that described to reduce work according to head back-off parameter After the step of transmission power of the first antenna of work, further include：

First range unit detects the distance between the user's head and the mobile terminal；

When distance between the user's head and the mobile terminal is more than the preset head distance threshold value, restore institute State the transmission power of the first antenna of work.

5. it is according to claim 1 reduce SAR method, which is characterized in that the first antenna include cellular antenna and At least one of WiFi antennas, the distance between the user's head and the mobile terminal are less than or equal to default Head distance threshold value when, according to head back-off parameter reduce work first antenna transmission power the step of include：

If the cellular antenna work, it is pre- to detect that the distance between the user's head and the mobile terminal are less than or equal to If the first head distance threshold value when, the transmission power of the cellular antenna of work is reduced according to the first head back-off parameter；

If the WiFi Antenna Operations, it is pre- to detect that the distance between the user's head and the mobile terminal are less than or equal to If the second head distance threshold value when, the transmission power of the WiFi antennas of work is reduced according to the second head back-off parameter；

If the cellular antenna and WiFi antennas work at the same time, detect between the user's head and the mobile terminal away from When from less than or equal to preset third head distance threshold value, according to third head back-off parameter reduce work cellular antenna and At least one transmission power in WiFi antennas.

6. the method according to claim 1 for reducing SAR, which is characterized in that described to reduce work according to body back-off parameter After the step of transmission power for the second antenna made, further include：

Second range unit detects the distance between the user's body and the mobile terminal；

When distance between the user's body and the mobile terminal is more than the preset body distance threshold, restore institute State the transmission power of the second antenna of work.

7. it is according to claim 1 reduce SAR method, which is characterized in that second antenna include cellular antenna and At least one of WiFi antennas, the distance between the user's body and the mobile terminal are less than or equal to default Body distance threshold when, according to body back-off parameter reduce work the second antenna transmission power the step of include：

If the cellular antenna work, it is pre- to detect that the distance between the user's body and the mobile terminal are less than or equal to If the first body distance threshold when, according to the first body back-off parameter reduce work cellular antenna transmission power；

If the WiFi Antenna Operations, it is pre- to detect that the distance between the user's body and the mobile terminal are less than or equal to If the second body distance threshold when, according to the second body back-off parameter reduce work WiFi antennas transmission power；

If the cellular antenna and WiFi antennas work at the same time, detect between the user's body and the mobile terminal away from When from less than or equal to preset third body distance threshold, according to third body back-off parameter reduce work cellular antenna and At least one transmission power in WiFi antennas.

8. a kind of mobile terminal, which is characterized in that including：

First antenna；

Second antenna；

First range unit is set to the first side of the mobile terminal, for detecting between user's head and the mobile terminal Distance, and generate head distance signal；

Second range unit is set to the second side opposite with first side of the mobile terminal, for detecting user's body The distance between described mobile terminal, and generate body distance signal；

Control module, for receiving the head distance signal and body distance signal, in the user's head and the movement When the distance between terminal is less than or equal to preset head distance threshold value, described the of work is controlled according to head back-off parameter One antenna reduces transmission power, to meet SAR value requirement of the mobile terminal to head；In the user's body and the shifting When the distance between dynamic terminal is less than or equal to preset body distance threshold, controlled described in work according to body back-off parameter Second antenna reduces transmission power, to meet SAR value requirement of the mobile terminal to body.

9. mobile terminal according to claim 8, which is characterized in that first range unit includes distance-sensor, Second range unit includes SAR sensors.

10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program The step of method as described in any one of claim 1 to 7 is realized when being executed by processor.