CN113133102B - SAR value adjustment method and device and mobile terminal - Google Patents

Abstract

The embodiment of the present invention discloses a method, device and mobile terminal for adjusting the SAR value. The radio frequency modem of the mobile terminal is preset with multiple working modes, and each working mode corresponds to a preset register value of the antenna switch. Different preset Setting the register values to correspond to different performance states of the antenna, the method includes: when the antenna is in the transmitting and receiving state, obtaining the current transmission performance parameters and reception performance parameters of the mobile terminal; judging the current working mode according to the transmission performance parameters and reception performance parameters, and controlling the antenna The switch is in the preset register value corresponding to the current working mode to adjust the SAR value. The technical scheme of the present invention can effectively solve the problem that the SAR value of the mobile terminal exceeds the standard by dividing the working mode of the radio frequency modem and dynamically calling different preset register values of the antenna switch in different working modes.

Description

Method, device and mobile terminal for adjusting SAR value

technical field

The present invention relates to the technical field of terminal electromagnetic radiation, in particular to a method, device and mobile terminal for adjusting SAR values.

Background technique

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 current to absorb and dissipate electromagnetic energy. SAR (Specific Absorption Ratio) refers to the electromagnetic radiation energy absorbed by a unit mass of material per unit time, and is also a measure of the impact on the human body. The larger the SAR value of the mobile phone, the greater the impact on the human body; otherwise, the smaller the impact. At present, the safety standard value of mobile phones announced by the Federal Communications Commission (FCC) of the United States is 1.6W/kg, and the safety standard value of mobile phones announced by the European Union (CE) is 2.0W/kg.

For current mobile terminals such as mobile phones, when the measured SAR value is greater than the specified safety standard, there are two main solutions: one is to adjust the matching topology of the antenna to change the hotspot distribution or antenna radiation performance of the mobile phone antenna, so as to achieve the reduction of the mobile phone antenna. The purpose of the SAR value; the second is to reduce the RF output power in the scene by opening the hot spot (hot-spot), or directly reducing the RF output power, or identifying the specific scene through some sensors (such as proximity sensors, etc.), so that Make the SAR value of the mobile phone antenna lower than the prescribed safety standard.

However, there are some problems in the above two schemes. For the first solution, although the problem of SAR exceeding the standard can be solved in essence, it is often difficult to realize it in practice. On the one hand, it needs to invest a lot of labor costs in a limited time. On the other hand, the SAR certification stage is generally in the project In the middle and later stages of development, rash changes will seriously affect the project development progress. Due to the design form of the antenna, the results after changes may not always meet expectations. For the second solution, the way of turning on the hotspot is limited to solving the SAR problem under 10mm of the FCC standard, but it is powerless for other scenarios; directly reducing the RF output power will affect the OTA (Over The Air) performance of the mobile phone, and thus the user's The actual experience; and the use of sensors to reduce targeted scenarios need to consider various factors such as the space of the mobile phone itself, cost, and SAR test complexity, so it is also difficult to weigh.

Contents of the invention

In view of the above problems, the present invention provides a method, device and mobile terminal for adjusting the SAR value. By dividing the working mode of the radio frequency modem and dynamically calling the different preset register values of the antenna switch in different working modes, it can be as far as possible. It is convenient and quick to effectively solve the problem of SAR value exceeding the standard in mobile terminals without affecting the customer experience and without adding other new devices.

One embodiment of the present invention provides a method for adjusting the SAR value, which is applied to a mobile terminal. The mobile terminal includes a radio frequency modem, an antenna switch, and an antenna. The radio frequency modem is preset with multiple operating modes, and each operating mode is respectively Corresponding to a preset register value of the antenna switch, different preset register values correspond to different performance states of the antenna, and the method includes:

When the antenna is in the transceiving state, acquiring the current transmission performance parameters and reception performance parameters of the mobile terminal;

Judging the current working mode of the radio frequency modem according to the transmitting performance parameter and the receiving performance parameter, and controlling the antenna switch to be at a preset register value corresponding to the current working mode to adjust the SAR value.

Further, in the above method for adjusting the SAR value, the radio frequency modem includes a first working mode, a second working mode and a third working mode, and the judgment of the current working mode of the radio frequency modem includes:

If the receiving performance parameter is less than a first preset threshold, then judging that the radio frequency modem is currently in the first working mode;

If the receiving performance parameter is greater than or equal to the first preset threshold and the transmitting performance parameter is greater than a second preset threshold, then judging that the radio frequency modem is currently in the second working mode;

If the receiving performance parameter is greater than or equal to the first preset threshold and the transmitting performance parameter is less than or equal to the second preset threshold, it is determined that the radio frequency modem is currently in the third working mode.

Further, in the method for adjusting the SAR value above, the transmission performance parameter is a transmission power or a transmitter gain adjustment value; the reception performance parameter is a signal-to-noise ratio or a ratio of energy per chip to interference power density.

Further, in the above method for adjusting the SAR value, the second preset threshold is smaller than the maximum transmit power of the antenna.

Further, in the above method for adjusting the SAR value, the determination of each preset register value of the antenna switch includes:

Testing the optimal performance state corresponding to when the SAR value of the antenna in the working mode corresponding to the radio frequency modem does not exceed the standard SAR value;

Taking the current register value of the antenna switch corresponding to the optimal performance state as the preset register value corresponding to the working mode.

Further, in the above-mentioned method for adjusting the SAR value, it also includes:

Detecting the working state of the antenna in real time, and acquiring the transmitting performance parameter and the receiving performance parameter of the mobile terminal when the antenna is in the transmitting and receiving state.

Another embodiment of the present invention provides a device for adjusting the SAR value, which is applied to a mobile terminal. The mobile terminal includes a radio frequency modem, an antenna switch, and an antenna. The radio frequency modem is preset with multiple operating modes, and each operating mode Respectively corresponding to a preset register value of the antenna switch, different preset register values correspond to different performance states of the antenna, the device includes:

A transceiver parameter acquisition module, configured to acquire the current transmission performance parameters and reception performance parameters of the mobile terminal when the antenna is in the transmission and reception state;

An antenna switch control module, configured to judge the current working mode of the radio frequency modem according to the transmitting performance parameter and the receiving performance parameter, and control the antenna switch to be in a preset register value corresponding to the current working mode to adjust the SAR value.

Further, in the above-mentioned device for adjusting the SAR value, the radio frequency modem includes a first working mode, a second working mode and a third working mode, and the judgment of the current working mode of the radio frequency modem includes:

If the receiving performance parameter is less than a first preset threshold, then judging that the radio frequency modem is currently in the first working mode;

If the receiving performance parameter is greater than or equal to the first preset threshold and the transmitting performance parameter is greater than a second preset threshold, then judging that the radio frequency modem is currently in the second working mode;

If the receiving performance parameter is greater than or equal to the first preset threshold and the transmitting performance parameter is less than or equal to the second preset threshold, it is determined that the radio frequency modem is currently in the third working mode.

Another embodiment of the present invention provides a mobile terminal, including a memory and a processor, the memory is used to store a computer program, and when the computer program runs on the processor, the mobile terminal performs the above-mentioned SAR adjustment value method.

Still another embodiment of the present invention provides a computer-readable storage medium, which stores a computer program, and executes the method for adjusting the SAR value according to the above when the computer program is run on a processor.

The technical solution of the present invention divides the working mode of the radio frequency modem and correspondingly adjusts the antenna switch to different preset register values in different working modes. Using different antenna paths will affect the performance status of the antenna, and different antenna paths can be The principle of setting through the antenna switch, when it is detected that the SAR value exceeds the standard, the current preset register value of the antenna switch can be adjusted to adjust the antenna to a specific performance state corresponding to the SAR value not exceeding the standard, so that no additional new The device can also effectively solve the problem that the SAR value of the mobile terminal exceeds the standard without affecting the customer experience as much as possible, which is convenient and quick.

Description of drawings

In order to illustrate the technical solution of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded It is regarded as limiting the protection scope of the present invention. In the respective drawings, similar components are given similar reference numerals.

FIG. 1 shows a schematic structural diagram of a mobile terminal according to an embodiment of the present invention;

FIG. 2 shows a schematic structural diagram of an antenna switch of a method for adjusting a SAR value according to an embodiment of the present invention;

FIG. 3 shows a first schematic flowchart of a method for adjusting a SAR value according to an embodiment of the present invention;

FIG. 4 shows a second schematic flowchart of a method for adjusting a SAR value according to an embodiment of the present invention;

Fig. 5 shows a schematic structural diagram of a device for adjusting a SAR value according to an embodiment of the present invention.

10-mobile terminal; 101-RF modem; 102-antenna switch; 103-antenna;

100-the device for adjusting the SAR value; 110-the acquisition module of the sending and receiving parameters; 120-the antenna switch control module.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

Hereinafter, the terms "comprising", "having" and their cognates that may be used in various embodiments of the present invention are only intended to represent specific features, numbers, steps, operations, elements, components or combinations of the foregoing, And it should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing or adding one or more features, numbers, steps, operations, elements, components or a combination of the foregoing possibilities.

In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, Unless clearly defined in various embodiments of the present invention.

Example 1

Referring to FIG. 1 to FIG. 3 , this embodiment proposes a method for adjusting the SAR value, which is applied to mobile terminals, such as mobile phones and tablet computers. The method for adjusting the SAR value of the present embodiment recognizes the working mode of the radio frequency modem in the mobile terminal under the current network, and dynamically calls different preset register values of the antenna switch, which can effectively solve the problem without directly reducing the radio frequency output power. The problem of SAR value exceeding the standard. For example, as shown in Figure 1, the mobile terminal 10 mainly includes a radio frequency modem 101, an antenna switch 102 and an antenna 103, wherein the radio frequency modem 101 is mainly used for modulating or demodulating radio frequency signals; the antenna switch 102 is mainly used for antenna Step 103 manages the signal path.

In this embodiment, the radio frequency modem 101 will be preset with multiple working modes, and each working mode will correspond to a preset register value of the antenna switch 102, that is, a working mode will correspond to a preset antenna switch A register value of 102. Different register values will correspond to different performance states of the antenna 103, for example, different register values will result in different radiation power of the antenna 103, which will affect the SAR value.

The working modes of the radio frequency modem 101 are divided in advance. Exemplarily, the division may be based on performance indicators related to signal transceiving. For example, Table 1 below shows an example of the division of working modes of the radio frequency modem 101 . Among them, SNR is a signal-to-noise ratio, which is mainly used to measure the receiving performance of the terminal, and b is the first preset threshold; TXAGC is a transmitter gain adjustment value, which is mainly used to measure the transmitting performance of the terminal, and a is the second preset threshold. Of course, the working modes can also be divided based on other indicators, such as signal-to-noise ratio SNR and transmission power TX_Power, etc., which can be determined according to actual needs.

It can be seen from Table 1 that when the two performance parameters of the mobile terminal 10 are obtained, the current working mode of the mobile terminal 10 can be identified according to the above table. For example, taking the first working mode (i.e. working mode (1)) as an example, as long as it is detected that the current SNR is less than b, no matter TXAGC>a or TXAGC≤a, it will be judged to be in the first working mode at present. It can be understood that this When the priority of SNR will be higher than TXAGC, this is because when the SNR is too small, it indicates that the mobile terminal 10 will not be able to receive the signal normally. At this time, it will be necessary to properly adjust the antenna 103 to ensure the normal reception of the signal.

Exemplarily, for the above-mentioned first preset threshold b and second preset threshold a, their values should satisfy the situation that the SAR value will never exceed the standard, and the specific values can be determined according to the actual scene where the mobile terminal 10 is located. Setting is used to adjust the working range corresponding to each working mode, so that the method can be adapted to more usage scenarios and the like. In addition, appropriately increasing the working range of some working modes such as the third working mode can make the antenna 103 work in the same working mode as far as possible without repeated switching between working modes, which can effectively reduce power consumption and improve battery life of the mobile terminal 10 and the like.

For example, if the first preset threshold b is properly reduced, the working range of the third working mode will be increased, otherwise, the working range of the third working mode will be contracted. Alternatively, if the second preset threshold a is appropriately increased, the working range of the third working mode will also be increased, and vice versa, the working range will be narrowed. Wherein, when TXAGC or TX_Power is used, the second preset threshold a will be smaller than the maximum transmit power (ie Max power) of the antenna 103 .

For the two indicators of TXAGC and SNR in the above table, it is mainly for mobile terminals supporting network standards such as 4G LTE or 5G NR, and for mobile terminals supporting network standards such as 2G CDMA or 3G WCDMA, it can also be based on TXAGC and Ec/lo (that is, the ratio of energy per chip to interference power density) and so on.

It can be understood that the number of working modes and specific mode content of the radio frequency modem 101 in Table 1 above is just an example, and is not intended as a limitation thereto. In actual application, the number of working modes of the radio frequency modem 101 can also be two, four or five, etc., and the specific mode content can also be divided by one or more indicators, and is not limited to the above-mentioned Two indicators etc.

In this embodiment, one working mode of the radio frequency modem 101 corresponds to one preset register value of the antenna switch 102 . For an antenna switch 102, there are generally at least one input terminal and at least one output terminal, and the connection between each input terminal and an output terminal is represented by a unique register value. As shown in FIG. 2 , the antenna switch 102 includes input terminals A-C and output terminals E-F connected to the antenna. For example, the connection path between the input terminal A and the output terminal E has a register value of 0x90; and the connection path between the input terminal C and the output terminal F has a register value of 0x70.

It can be understood that calling different register values of the antenna switch 102 indicates that different connection paths in the antenna switch 102 are selected, and correspondingly, the signal will be transmitted to the antenna 103 through the selected connection path and then emitted. For the antenna 103, in addition to its own characteristics, in the compact mobile terminal 10, different transmission paths will lead to different performances of the antenna 103, such as radiation power.

In this embodiment, each preset register value corresponds to a performance state of the antenna 103 . Exemplarily, the determination process of each preset register value of the antenna switch 102 mainly includes: testing the optimal performance state corresponding to when the SAR value of the antenna 103 in the working mode corresponding to the radio frequency modem 101 does not exceed the standard SAR value, Then record the current register value of the antenna switch 102 corresponding to the optimal performance state as the preset register value corresponding to the working mode.

Wherein, the above-mentioned optimal performance state means that under this performance state, the antenna 103 will never exceed the SAR value, and the antenna radiation power and other performances at this time can also meet the conditions required for transmission or reception. Usually, the optimal performance state can be selected and determined in advance from a plurality of tests.

Therefore, the radio frequency modem 101 of the mobile terminal 10 is divided into working modes in advance, and each working mode is pre-associated with a preset register value and a corresponding antenna performance state, as shown in FIG. The main steps of the value method are described.

Step S110 , when the antenna 103 is in the transmitting and receiving state, acquire the current transmitting performance parameter and receiving performance parameter of the mobile terminal 10 .

For step S110, the two parameters in the mobile terminal 10 are acquired respectively, and then the working mode identification is performed using the acquired parameters. Wherein, the transmitting performance parameter and the receiving performance parameter will correspond to the indicators used for the division of the working modes of the radio frequency modem 101 . For example, when dividing based on SNR and TXAGC, in the above step S110, the values of the parameters SNR and TXAGC will also be obtained, and then used to determine the current working mode.

Considering that the antenna 103 mainly has two working states, one is the transmitting and receiving state (ie, the TRX state); the other is the receiving only state (ie, the RX_only state). In the RX_only state, since the antenna 103 does not transmit, there is no problem that the SAR value exceeds the limit.

Therefore, as shown in FIG. 4 , further optionally, the method for adjusting the SAR value further includes step S100 of detecting the working state of the antenna 103 in real time. When the antenna 103 is in the transmitting and receiving state, the above-mentioned transmitting performance parameter and the above-mentioned receiving performance parameter of the mobile terminal 10 are acquired. It can be understood that the working mode of the radio frequency modem 101 is further identified only when it is detected that it is in the transmitting and receiving state, otherwise no corresponding operation is performed, which can reduce system resource occupation and the like.

Step S120, judging the current working mode of the radio frequency modem 101 according to the transmitting performance parameter and the receiving performance parameter.

Exemplarily, if the radio frequency modem 101 is preset with three working modes as shown in Table 1 above, namely the first working mode, the second working mode and the third working mode, for the above step S120, the current working mode of the radio frequency modem 101 Judgment of working mode, including:

If the receiving performance parameter is less than the first preset threshold, it is determined that the radio frequency modem 101 is currently in the first working mode; if the receiving performance parameter is greater than or equal to the first preset threshold and the transmitting performance parameter is greater than the second preset threshold, then Judging that the radio frequency modem 101 is currently in the second working mode; if the receiving performance parameter is greater than or equal to the first preset threshold and the transmitting performance parameter is less than or equal to the second preset threshold, then judging that the radio frequency modem 101 is currently in the third working mode.

It can be understood that the determination of the current working mode in the above step S120 needs to be adjusted accordingly according to the specific working mode preset by the radio frequency modem 101 , so it is not limited here.

Step S130, controlling the antenna switch 102 to be at the preset register value corresponding to the current working mode to adjust the SAR value.

After the working mode of the mobile terminal 10 is determined, it will be determined whether to adjust the antenna switch 102 . Exemplarily, still taking the above three working modes in Table 1 as an example, if it is judged to be in the third working mode, it means that neither the transmitting performance parameter nor the receiving performance parameter reaches the threshold at this time, therefore, it can be maintained or Adjust to the preset register value corresponding to the current working mode. For example, if the current register value is the same as the preset register value at this time, the status quo will be maintained; otherwise, it will be adjusted to the preset register value. If it is determined that it is in the first working mode or the second working mode, then the mobile terminal 10 needs to be adjusted to the performance state of the antenna 103 corresponding to the first working mode or the second working mode, so as to ensure that the SAR in the current working mode The value must not be exceeded.

Wherein, the antenna switch 102 can be used to connect the output to a single antenna, or to connect the output to multiple antennas, and it should satisfy that the register value of the connection path between each input terminal and each output terminal is unique. In this way, regardless of the transmission of a single antenna or the simultaneous transmission of multiple antennas, the purpose of adjusting the performance status of each antenna can be achieved by calling different register values.

The method for adjusting the SAR value proposed in this embodiment is applied to the mobile terminal. By dividing the working mode of the radio frequency modem in the mobile terminal and correspondingly adjusting the antenna switch to different preset register values in different working modes, that is, based on different The antenna path will affect the performance status of the antenna, and different antenna paths can be set through the antenna switch. When the SAR value is detected to exceed the standard, the current preset register value of the antenna switch can be directly adjusted to adjust the antenna to Corresponding performance status and SAR value does not exceed the standard, so that there is no need to directly reduce the RF output power or use sensors to measure and then determine the specific power reduction value, etc., so as not to affect the customer experience as much as possible and without adding other new devices It is convenient and quick to effectively solve the problem that the SAR value of the mobile terminal exceeds the standard.

Example 2

Please refer to Fig. 5, the present embodiment proposes a device 100 for adjusting the SAR value, which is applied to a mobile terminal. The mobile terminal includes a radio frequency modem, an antenna switch, and an antenna. The radio frequency modem is preset with multiple operating modes, and each operating mode Corresponding to a preset register value of the antenna switch respectively, different preset register values correspond to different performance states of the antenna, the device includes:

A transceiver parameter acquisition module 110, configured to acquire the current transmission performance parameters and reception performance parameters of the mobile terminal when the antenna is in the transmission and reception state;

The antenna switch control module 120 is configured to judge the current working mode of the radio frequency modem according to the transmitting performance parameter and the receiving performance parameter, and control the antenna switch to be in a preset register value corresponding to the current working mode to adjust the SAR value.

Further, the radio frequency modem includes a first working mode, a second working mode and a third working mode, and the judgment of the current working mode of the radio frequency modem includes:

If the receiving performance parameter is less than a first preset threshold, then judging that the radio frequency modem is currently in the first working mode;

If the receiving performance parameter is greater than or equal to the first preset threshold and the transmitting performance parameter is greater than a second preset threshold, then judging that the radio frequency modem is currently in a second working mode;

If the receiving performance parameter is greater than or equal to the first preset threshold and the transmitting performance parameter is less than or equal to the second preset threshold, it is determined that the radio frequency modem is currently in a third working mode.

It can be understood that the above-mentioned apparatus 100 for adjusting the SAR value corresponds to the method for adjusting the SAR value in Embodiment 1. The optional items in Embodiment 1 are also applicable to this embodiment, and will not be described in detail here.

The present invention also provides a mobile terminal, which may include a smart phone, a tablet computer and the like. The mobile terminal includes a memory and a processor, the memory can be used to store a computer program, and the processor runs the computer program to enable the mobile terminal to execute the above-mentioned method for adjusting the SAR value or the functions of each module in the above-mentioned device 100 for adjusting the SAR value .

The memory can include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application program required by at least one function; the data storage area can store data created according to the use of the mobile terminal (such as audio data, telephone This, etc.) etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.

The present invention also provides a computer storage medium for storing the computer program used in the above mobile terminal.

In the several embodiments provided in this application, it should be understood that the disclosed devices and methods may also be implemented in other ways. The device embodiments described above are only illustrative. For example, the flowcharts and structural diagrams in the accompanying drawings show the possible implementation architecture and functions of devices, methods and computer program products according to multiple embodiments of the present invention. and operation. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or part of code that includes one or more Executable instructions. It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. It is also to be noted that each block of the block diagrams and/or flow diagrams, and combinations of blocks in the block diagrams and/or flow diagrams, can be implemented by a dedicated hardware-based system that performs the specified function or action may be implemented, or may be implemented by a combination of special purpose hardware and computer instructions.

In addition, each functional module or unit in each embodiment of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes. .

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention.

Claims (10)

1. A method for adjusting an electromagnetic radiation absorption ratio SAR, which is applied to a mobile terminal, wherein the mobile terminal includes a radio frequency modem, an antenna switch and an antenna, the radio frequency modem is preset with a plurality of operation modes, each operation mode corresponds to a preset register value of the antenna switch, and different preset register values correspond to different performance states of the antenna, the method comprises:

when the antenna is in a receiving and transmitting state, acquiring the current transmitting performance parameter and receiving performance parameter of the mobile terminal;

and judging the current working mode of the radio frequency modem according to the transmitting performance parameter and the receiving performance parameter, and controlling the antenna switch to be in a preset register value corresponding to the current working mode so as to adjust the SAR value.

2. The method of adjusting the electromagnetic radiation absorption ratio SAR according to claim 1, wherein said radio frequency modem comprises a first mode of operation, a second mode of operation, and a third mode of operation, and wherein said determining of the current mode of operation of said radio frequency modem comprises:

if the receiving performance parameter is smaller than a first preset threshold value, judging that the radio frequency modem is currently in the first working mode;

if the receiving performance parameter is greater than or equal to the first preset threshold value and the transmitting performance parameter is greater than a second preset threshold value, judging that the radio frequency modem is currently in the second working mode;

and if the receiving performance parameter is greater than or equal to the first preset threshold value and the transmitting performance parameter is less than or equal to the second preset threshold value, judging that the radio frequency modem is currently in the third working mode.

3. The method of adjusting the electromagnetic radiation absorption ratio SAR according to claim 2, wherein said transmission performance parameter is a transmission power or a transmitter gain adjustment value; the reception performance parameter is a signal-to-noise ratio or a ratio of energy per chip to interference power density.

4. A method of adjusting an electromagnetic radiation absorption ratio SAR according to claim 3, wherein said second predetermined threshold is less than a maximum transmit power of said antenna.

5. Method for adjusting the electromagnetic radiation absorption ratio SAR according to claim 1, wherein the determination of the respective preset register value of said antenna switch comprises:

testing an optimal performance state corresponding to the antenna when the SAR value of the antenna in the working mode corresponding to the radio frequency modem does not exceed a standard SAR value;

and taking the current register value of the antenna switch corresponding to the optimal performance state as a preset register value corresponding to the working mode.

6. The method of adjusting the electromagnetic radiation absorption ratio SAR according to claim 1, further comprising:

and detecting the working state of the antenna in real time, and acquiring the transmitting performance parameter and the receiving performance parameter of the mobile terminal when the antenna is in the receiving and transmitting state.

7. An apparatus for adjusting an electromagnetic radiation absorption ratio SAR, which is applied to a mobile terminal, wherein the mobile terminal includes a radio frequency modem, an antenna switch and an antenna, the radio frequency modem is preset with a plurality of operation modes, each operation mode corresponds to a preset register value of the antenna switch, and different preset register values correspond to different performance states of the antenna, the apparatus includes:

the receiving and transmitting parameter acquisition module is used for acquiring the current transmitting performance parameter and receiving performance parameter of the mobile terminal when the antenna is in a receiving and transmitting state;

and the antenna switch control module is used for judging the current working mode of the radio frequency modem according to the transmitting performance parameter and the receiving performance parameter and controlling the antenna switch to be in a preset register value corresponding to the current working mode so as to adjust the SAR value.

8. The apparatus for adjusting the electromagnetic radiation absorption ratio SAR according to claim 7, wherein said radio frequency modem comprises a first mode of operation, a second mode of operation, and a third mode of operation, and wherein said determining of the current mode of operation of said radio frequency modem comprises:

if the receiving performance parameter is smaller than a first preset threshold value, judging that the radio frequency modem is currently in the first working mode;

if the receiving performance parameter is greater than or equal to the first preset threshold value and the transmitting performance parameter is greater than a second preset threshold value, judging that the radio frequency modem is currently in the second working mode;

and if the receiving performance parameter is greater than or equal to the first preset threshold value and the transmitting performance parameter is less than or equal to the second preset threshold value, judging that the radio frequency modem is currently in the third working mode.

9. A mobile terminal comprising a memory and a processor, the memory for storing a computer program which, when run on the processor, causes the mobile terminal to perform the method of adjusting the electromagnetic radiation absorption ratio SAR according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that it stores a computer program which, when run on a processor, performs the method of adjusting the electromagnetic radiation absorption ratio SAR according to any one of claims 1 to 6.