WO2014161356A1

WO2014161356A1 - Method of lowering sar, mobile terminal, and computer storage medium

Info

Publication number: WO2014161356A1
Application number: PCT/CN2013/090258
Authority: WO
Inventors: 杨少华; 杨永兴
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-08-19
Filing date: 2013-12-23
Publication date: 2014-10-09
Also published as: CN104426590A

Abstract

Disclosed is a method of lowering electromagnetic wave energy specific absorption ratio (SAR) of a mobile terminal. The method comprises: arranging at least two antennas in a mobile terminal, the first antenna being a main antenna, the second antenna being an auxiliary antenna, and placing the first antenna and the second antenna diagonally in the mobile terminal; detecting outgoing radiation power of the first antenna in a communication process of the mobile terminal in real time; and controlling, according to the outgoing radiation power, the mobile terminal to use the first antenna or the second antenna to perform communication. Meanwhile, further disclosed are a mobile terminal and a computer storage medium.

Description

Method for reducing SAR, mobile terminal and computing product storage

The present invention relates to mobile terminal technologies, and in particular, to a method for reducing electromagnetic energy absorption ratio (SAR) and a mobile terminal and a computer storage medium. Background technique

With the popularization of mobile terminals and the increase in the time of using mobile terminals per capita, the influence of electromagnetic waves radiated by mobile terminals on the human body has attracted more and more attention.

At present, SAR is usually used to express the unit mass of human tissue and the electromagnetic radiation energy absorbed per unit time. The unit of SAR is watts/kg. Many countries have established and standardized safety standards for human body exposure to electromagnetic waves based on SAR. However, in the long-term communication process using the mobile terminal, since the mobile terminal is close to the human body, the damage caused to the human body radiation energy is particularly obvious at this time. Therefore, how to reduce the SAR of the mobile terminal communication is becoming more and more popular among manufacturers. And the attention of the majority of users. Summary of the invention

In view of this, embodiments of the present invention are expected to provide a method for reducing SAR, a mobile terminal, and a computer storage medium, which can reduce the SAR of the mobile terminal during communication and reduce the electromagnetic radiation of the mobile terminal to the human body.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

An embodiment of the present invention provides a method for reducing an electromagnetic wave energy absorption ratio of a mobile terminal, where at least two antennas are disposed in the mobile terminal, and the method includes:

Real-time detecting the external radiated power of the first antenna in the communication process of the mobile terminal;

Controlling, by the external radiated power, the mobile terminal to use the first antenna or the second antenna Line communication.

Preferably, the controlling, by the external radiated power, the mobile terminal to communicate by using the first antenna or the second antenna, includes:

Determining, when the currently detected external radiated power of the first antenna is greater than a set first threshold, maintaining communication using the first antenna;

When it is determined that the external radiation power of the first antenna that is currently detected is less than or equal to the first threshold value and continues for a set duration, the current radio frequency path is switched to the second antenna to communicate using the second antenna, The first antenna is turned off.

Preferably, the method further includes: placing the first antenna and the second antenna diagonally in a mobile terminal;

The first antenna is a primary antenna, and the second antenna is an auxiliary antenna.

Preferably, when the communication is performed by using the second antenna, the method further includes:

The external radiated power of the second antenna in the communication process of the mobile terminal is detected in real time; and the mobile terminal controls the mobile terminal to communicate using the second antenna or the first antenna according to the detected external radiated power of the second antenna.

Preferably, the controlling, by the external radiated power of the second antenna, the mobile terminal to communicate by using the second antenna or the first antenna, includes:

When it is determined that the externally radiated power of the second antenna that is currently detected is greater than a set second threshold, maintaining communication using the second antenna;

Determining that the current detected radio frequency of the second antenna is less than or equal to the second threshold and continues to set the duration, switching the current radio frequency path to the first antenna to communicate using the first antenna , closing the second antenna.

The embodiment of the present invention further provides a mobile terminal, where at least two antennas are disposed in the mobile terminal, where the mobile terminal includes a first detecting unit and a communication unit;

The first detecting unit is configured to detect, in real time, the first day of the communication process of the mobile terminal The external radiated power of the line;

The communication unit is configured to control, according to the detected external radiated power of the first antenna, the mobile terminal to communicate by using the first antenna or the second antenna.

Preferably, the mobile terminal further includes a radio frequency circuit control unit and an antenna selection unit;

The radio frequency circuit control unit is configured to: when the currently detected external radiated power of the first antenna is greater than a set first threshold, to maintain communication using the first antenna; When the external radiation power detected by the unit is less than or equal to the first threshold value and continues for a set duration, it is determined that the second antenna is used for communication;

The antenna selection unit is configured to switch the current radio frequency path to the second antenna and use the second antenna to communicate when the radio frequency circuit control unit determines to use the second antenna for communication, to close the first antenna .

Preferably, the first antenna and the second antenna are diagonally placed in the mobile terminal;

Preferably, the mobile terminal further includes a second detecting unit configured to detect an external radiated power of the second antenna in the mobile terminal communication process in real time;

Correspondingly, the communication unit is further configured to control, according to the detected external radiated power of the second antenna, the mobile terminal to communicate by using the second antenna or the first antenna.

Preferably, the radio frequency circuit control unit is further configured to: when determining that the externally radiated power of the second antenna that is currently detected is greater than a set second threshold, maintaining communication using the second antenna; When the external radiation power detected by the second detecting unit is less than or equal to the second threshold value and continues for a set duration, it is determined that the first antenna is used for communication;

The antenna selection unit is further configured to switch the current radio frequency path to the first antenna and use the first antenna when the radio frequency circuit control unit determines to use the first antenna for communication Communication is performed to close the second antenna.

The embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores a computer program, and the computer program is used to execute the method for reducing SAR as described above.

The method for reducing SAR, the mobile terminal, and the computer storage medium provided by the embodiment of the present invention, where at least two antennas are disposed in the mobile terminal, the first antenna is a main antenna, and the second antenna is an auxiliary antenna, in the mobile terminal. The first antenna is placed diagonally with the second antenna; the external radiated power of the first antenna in the communication process of the mobile terminal is detected in real time; and the mobile terminal is controlled according to the detected external radiated power of the first antenna Communication is performed using the first antenna or the second antenna. In this way, the SAR of the mobile terminal during communication is reduced, and the electromagnetic radiation of the mobile terminal to the human body is reduced. Specifically, the technical solution in the embodiment of the present invention can detect the external radiated power of the radio frequency path antenna in real time during the communication process of the mobile terminal, and switch the distance of the radio frequency path after detecting that the first antenna is close to the human body for a certain period of time. The second antenna farther away from the first antenna, that is, the antenna farthest from the human body, thereby reducing the electromagnetic distance of the mobile terminal to the human body by increasing the physical distance between the transmitting antenna and the human body, so that the mobile terminal is to the human body. Electromagnetic radiation hazards have been minimized. DRAWINGS

1 is a schematic flowchart of an implementation process of a method for reducing a mobile terminal SAR according to an embodiment of the present invention;

2 is a schematic diagram of a layout of a primary antenna and an auxiliary antenna according to an embodiment of the present invention; FIG. 3 is a schematic flowchart of a process for performing antenna selection during communication by a mobile terminal according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a structure of a mobile terminal according to an embodiment of the present invention. detailed description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, The preferred embodiments illustrated are for illustrative purposes only and are not intended to limit the invention. The existing large-scale air performance test (OTA, Over The Air) test data shows: When the mobile terminal is close to the human hand, the total radiated power (TRP, Total Radiated Power) is significantly reduced by about 3~5dBm; when the mobile terminal is close to the human head plus the human hand At the time, the TRP is significantly reduced by about 5~8dBm. That is to say, when the mobile terminal approaches the human body, the external radiated power of the mobile terminal is significantly reduced due to the change of the external impedance of the antenna.

Therefore, it can be judged whether the mobile terminal is close to the human body by judging the change of the external radiated power.

At present, the calculation formula of SAR is: SAR=P/( Xa+Xb ) 2; where P is the mobile terminal transmit power, Xa is the distance from the mobile terminal to the edge of the human body part, and Xb is the SAR maximum point to the human body part of the human body part. The distance from the edge.

It can be seen from the above formula that when the transmission power of the mobile terminal is constant, if the physical distance between the human body and the mobile terminal is increased, the electromagnetic wave energy absorption ratio SAR value of the human body to the radiation will decrease in a square relationship.

It can be seen that by increasing the distance between the RF transmitting antenna and the human body, the SAR value can be significantly reduced.

FIG. 1 is a schematic diagram of an implementation process of a method for reducing a SAR of a mobile terminal according to an embodiment of the present invention. As shown in FIG. 1, the method mainly includes the following steps:

Step 101: The external radiated power of the first antenna in the communication process of the mobile terminal is detected in real time; specifically, the method further includes:

Providing at least two antennas in the mobile terminal, wherein the first antenna is a primary antenna, and the second antenna is an auxiliary antenna; and the first antenna and the second antenna are diagonal in a mobile terminal Placement, Figure 2 shows the layout of the main antenna and the auxiliary antenna.

Step 102: Control, according to the external radiated power, the mobile terminal to communicate by using the first antenna or the second antenna. Specifically, the controlling, by the external radiant power, the mobile terminal to communicate by using the first antenna or the second antenna, includes:

Here, when the second antenna is used for communication, the method further includes:

Specifically, the controlling, by the external radiated power of the second antenna, the mobile terminal to communicate by using the second antenna or the first antenna, includes:

Here, the first threshold value and the second threshold value may all be set according to an OTA data standard; and the values of the first threshold value and the second threshold value may be the same or different.

In the communication process of the mobile terminal, the embodiment of the present invention detects the external radiated power of the working antenna in real time, determines whether the mobile terminal is close to the caller by changing the external radiated power, and further determines whether the working antenna is to be switched.

For example, when it is detected that the external radiated power of the first antenna is suddenly lower than the set first threshold, it is determined that the first antenna is close to the caller, and after a period of time, the external antenna of the first antenna is When the radio power is still below the set first threshold, the radio frequency path is switched from the first antenna to the second antenna that is far away from the physical distance of the caller, thereby reducing the electromagnetic radiation of the antenna to the caller and reducing The electromagnetic wave caused by the mobile terminal to the caller.

FIG. 3 is a schematic flowchart of a process for performing antenna selection by a mobile terminal during communication according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps:

Step 301: The mobile terminal starts communication;

Here, when the mobile terminal starts communication, the default first antenna is a communication antenna.

Step 302: Detect whether the external radiated power of the first antenna is abnormal, and if yes, go to step 303; otherwise, go to step 307;

Specifically, when the external radiated power of the first antenna is less than or equal to the set first threshold, it is determined that the external radiated power of the first antenna is abnormal.

When the external radiated power of the first antenna is greater than the set first threshold, it is determined that the mobile terminal's radiation to the caller is negligible; at this time, the communication antenna does not need to be switched.

The first threshold is set according to actual conditions.

Step 303: periodically detecting the external radiated power of the first antenna, and then performing step 304; Step 304: determining whether the external radiated power of the first antenna is abnormal for a long time, and if yes, performing step 305; otherwise, performing step 307;

Step 305: determining that the mobile terminal contacts the caller for a long time, switching the transmission path to the second antenna (first antenna), and then performing step 306;

Here, after detecting a certain time in real time, if it is found that the external radiated power of the mobile terminal is still lower than the set first threshold, that is, lower than the set normal value, it is determined that the first antenna of the mobile terminal is in the working state. The time is close to the caller, and the transmission path is switched from the first antenna to the second antenna that is physically far from the caller.

Step 306: Detect whether the external radiated power of the second antenna (the first antenna) is normal for a long time, if normal, go to step 307; if not, go to step 305; For example, when the mobile terminal uses the second antenna to communicate, the user's call posture in a certain period of time does not change, and thus the external radiated power of the second antenna is always normal; but when the user changes the call posture, for example, the mobile terminal When moving up or down, the external radiated power of the second antenna may be lower than the set second threshold, that is, lower than the set normal value.

Step 307: Communicate using the second antenna (first antenna).

Here, when the external radiated power of the second antenna (the first antenna) is always normal, the second antenna (the first antenna) continues to be used for communication; when the external radiated power of the second antenna (the first antenna) is abnormal, The transmission path is switched to the first antenna (second antenna) for communication.

4 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention. As shown in FIG. 4, the mobile terminal includes a first detecting unit 41 and a communication unit 42.

The first detecting unit 41 is configured to detect an external radiated power of the first antenna in the communication process of the mobile terminal in real time;

The communication unit 42 is configured to control the mobile terminal to communicate using the first antenna or the second antenna according to the detected external radiated power of the first antenna.

Here, the first antenna and the second antenna are diagonally placed in the mobile terminal;

Specifically, the mobile terminal further includes a radio frequency circuit control unit 43 and an antenna selection unit 44;

The radio frequency circuit control unit 43 is configured to: when the currently detected external radiated power of the first antenna is greater than a set first threshold, to maintain communication using the first antenna; When the external radiated power detected by the detecting unit 41 is less than or equal to the first threshold value and continues for a set duration, it is determined that the second antenna is used for communication;

The antenna selection unit 44 is configured to switch the current radio frequency path to the second antenna and use the second antenna when the radio frequency circuit control unit determines to use the second antenna for communication Communication is performed to close the first antenna.

Specifically, the mobile terminal further includes a second detecting unit 45 configured to detect, in real time, the external radiated power of the second antenna in the communication process of the mobile terminal;

Correspondingly, the communication unit 42 is further configured to control the mobile terminal to communicate using the second antenna or the first antenna according to the detected external radiated power of the second antenna.

Specifically, the radio frequency circuit control unit 43 is further configured to: when determining that the externally radiated power of the second antenna that is currently detected is greater than a set second threshold, maintaining communication using the second antenna; When the external radiation power detected by the second detecting unit 45 is less than or equal to the second threshold value and continues for a set duration, it is determined that the first antenna is used for communication;

The antenna selection unit 44 is further configured to: when the radio frequency circuit control unit 43 determines to use the first antenna for communication, switch the current radio frequency path to the first antenna to communicate using the first antenna, and close the Second antenna.

It will be understood by those skilled in the art that the implementation functions of the processing units in the mobile terminal shown in FIG. 4 can be understood by referring to the aforementioned related description of the method for reducing the mobile terminal SAR. Those skilled in the art should understand that the functions of the processing units in the mobile terminal shown in FIG. 4 can be implemented by a program running on the processor, or can be implemented by a specific logic circuit.

Here, the first detecting unit 41, the communication unit 42, the second detecting unit 45, the radio frequency circuit control unit 43, and the antenna selecting unit 44 may each be an application processor AP (AP, Application Processor) in the mobile terminal, a central processing unit (CPU) , Central Processing Unit), Digital Signal Processor (DSP) or Field Programmable Gate Array (FPGA).

The embodiment of the present invention further describes a computer storage medium, wherein the computer storage medium stores a computer program, and the computer program is used to execute the method for reducing the mobile terminal S AR shown in FIG. 1 in the embodiment of the present invention.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Range of protection. Modifications made in accordance with the principles of the invention are to be understood as falling within the scope of the invention. Industrial applicability

In the embodiment of the present invention, at least two antennas are disposed in the mobile terminal, the first antenna is a main antenna, the second antenna is an auxiliary antenna, and the first antenna and the second antenna are used in a mobile terminal. Diagonally placed; detecting the external radiated power of the first antenna in the communication process of the mobile terminal in real time; controlling the mobile terminal to communicate using the first antenna or the second antenna according to the external radiated power, thus reducing the mobile terminal in The SAR during communication also reduces the electromagnetic radiation of the mobile terminal to the human body.

Claims

claims

1. A method of reducing the electromagnetic wave energy absorption ratio of a mobile terminal. At least two antennas are provided in the mobile terminal. The method includes:

Real-time detection of the external radiation power of the first antenna during mobile terminal communication;

The mobile terminal is controlled to use the first antenna or the second antenna to communicate according to the external radiation power.

2. The method according to claim 1, wherein the controlling the mobile terminal to use the first antenna or the second antenna to communicate according to the external radiation power includes:

When it is determined that the currently detected external radiation power of the first antenna is greater than the set first threshold, keep using the first antenna for communication;

When it is determined that the currently detected external radiation power of the first antenna is less than or equal to the first threshold value and continues for a set period of time, the current radio frequency channel is switched to the second antenna and the second antenna is used for communication, Turn off the first antenna.

3. The method according to claim 1 or 2, wherein the method further includes: placing the first antenna and the second antenna diagonally in the mobile terminal;

Wherein, the first antenna is a main antenna, and the second antenna is an auxiliary antenna.

4. The method according to claim 2, wherein when using the second antenna for communication, the method further includes:

Detect the external radiation power of the second antenna in real time during the communication process of the mobile terminal; control the mobile terminal to use the second antenna or the first antenna to communicate according to the detected external radiation power of the second antenna.

5. The method according to claim 4, wherein the controlling the mobile terminal to use the second antenna or the first antenna to communicate according to the detected external radiation power of the second antenna includes:

It is determined that the currently detected external radiation power of the second antenna is greater than the set second threshold. value, keep using the second antenna for communication;

When it is determined that the currently detected external radiation power of the second antenna is less than or equal to the second threshold value and continues for a set period of time, the current radio frequency channel is switched to the first antenna and the first antenna is used for communication. , turning off the second antenna.

6. A mobile terminal, at least two antennas are provided in the mobile terminal, and the mobile terminal further includes a first detection unit and a communication unit; wherein,

The first detection unit is configured to detect the external radiation power of the first antenna in real time during the communication process of the mobile terminal;

The communication unit is configured to control the mobile terminal to use the first antenna or the second antenna to communicate according to the detected external radiation power of the first antenna.

7. The mobile terminal according to claim 6, wherein the mobile terminal further includes a radio frequency circuit control unit and an antenna selection unit; wherein,

The radio frequency circuit control unit is configured to continue to use the first antenna for communication when it determines that the currently detected external radiation power of the first antenna is greater than a set first threshold value; during the first detection When the external radiation power detected by the unit is less than or equal to the first threshold value and continues for a set period of time, it is determined that the second antenna is used for communication;

The antenna selection unit is configured to switch the current radio frequency path to the second antenna and use the second antenna for communication when the radio frequency circuit control unit determines that the second antenna is used for communication, and turns off the first antenna. .

8. The mobile terminal according to claim 6, wherein the first antenna and the second antenna are placed diagonally in the mobile terminal; wherein,

The first antenna is a main antenna, and the second antenna is an auxiliary antenna.

9. The mobile terminal according to claim 6, wherein the mobile terminal further includes a second detection unit configured to detect the external radiation power of the second antenna in real time during the communication process of the mobile terminal; Correspondingly, the communication unit is further configured to control the mobile terminal to use the second antenna or the first antenna to communicate according to the detected external radiation power of the second antenna.

10. The mobile terminal according to claim 9, wherein the radio frequency circuit control unit is further configured to maintain when it determines that the currently detected external radiation power of the second antenna is greater than a set second threshold value. Use the second antenna for communication; when the external radiation power detected by the second detection unit is less than or equal to the second threshold value and continues for a set period of time, determine to use the first antenna for communication;

The antenna selection unit is further configured to, when the radio frequency circuit control unit determines that the first antenna is used for communication, switch the current radio frequency channel to the first antenna and use the first antenna for communication, and turn off the second antenna.

11. A computer storage medium, the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the method described in any one of claims 1 to 5.