CN108601073B - Method for reducing SAR, mobile terminal and computer readable storage medium - Google Patents

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

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Publication number
CN108601073B
CN108601073B CN201810742534.XA CN201810742534A CN108601073B CN 108601073 B CN108601073 B CN 108601073B CN 201810742534 A CN201810742534 A CN 201810742534A CN 108601073 B CN108601073 B CN 108601073B
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mobile terminal
antenna
distance
head
user
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CN108601073A (en
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侯剑章
周昌文
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Oneplus Technology Shenzhen Co Ltd
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Oneplus Technology Shenzhen Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72448—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions
    • H04M1/72454—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions according to context-related or environment-related conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72448—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions
    • H04M1/72457—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions according to geographic location
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72448—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions
    • H04M1/72463—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions to restrict the functionality of the device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/283—Power depending on the position of the mobile

Abstract

The invention relates to a method for reducing SAR (synthetic aperture radar), a mobile terminal and a computer readable storage medium, which comprise a first antenna, a second antenna, a first distance measuring device and a second distance measuring device, wherein the first distance measuring device is arranged on a first side of the mobile terminal, and the second distance measuring device is arranged on a second side of the mobile terminal, which is opposite to the first side. The first ranging device detects the distance between the head of the user and the mobile terminal, and reduces the transmitting power of the first antenna according to the head backspace parameter when the distance between the head of the user and the mobile terminal is smaller than or equal to a preset head distance threshold value. And the second distance measuring device detects the distance between the body of the user and the mobile terminal, and reduces the transmitting power of the working second antenna according to the body rollback parameter when the distance between the body of the user and the mobile terminal is less than or equal to a preset body distance threshold value. Therefore, the SAR value of the mobile terminal can be effectively reduced through the first ranging device and the second ranging device on the premise of not influencing the OTA performance of the mobile terminal.

Description

Method for reducing SAR, mobile terminal and computer readable storage medium
Technical Field
The present invention relates to the technical field of mobile terminal radiation adjustment, and in particular, to a method for reducing SAR, a mobile terminal, and a computer-readable storage medium.
Background
Sar (specific Absorption rate), which is an electromagnetic wave Absorption ratio or specific Absorption rate, is defined as the electromagnetic power absorbed or consumed by a unit mass of human tissue, and is expressed in units of W/kg. Under the action of the external electromagnetic field, an induction electromagnetic field is generated in the human body. Since various organs of the human body are lossy media, the electromagnetic field in the body will generate electric currents, resulting in absorption and dissipation of electromagnetic energy. The SAR value generally refers to heat energy generated by electromagnetic waves in a mobile phone or a wireless product, and is measurement data which affects a human body. The larger the heat value of the mobile phone is, the larger the influence on the human body is; otherwise, the influence is small. The current standard safety value of mobile phones published by the federal commission of the united states (FCC) is 1.6W/kg, and therefore mobile phones are products within the safety standard as long as the SAR value of the mobile phones is below 1.6W/kg. The safety standard value of the mobile phone published by the European Union is 2.0W/kg.
A handset antenna is an antenna mounted on a handset for receiving and transmitting signals from a transceiver. At present, in order to pursue fashionability of appearance, comprehensiveness of functions and portability of a mobile phone, the space of an antenna of the mobile phone is continuously compressed, so that radiation hot spots of the antenna are more and more concentrated, and the SAR value of the mobile phone is higher and higher. With the continuous development of 4G communication, 4G has become the standard configuration of the current mobile phone, and especially, the application of LTE Advanced, multi-antenna technology, main diversity antenna technology and MIMO technology to the mobile phone is more and more mature, and the communication capability of the mobile phone is more and more powerful. However, the increase of the mobile phone antenna also increases the risk of radiation of the mobile phone to the human body. In addition, the scenes that antennas such as WIFI and Bluetooth work simultaneously are considered, the SAR value of the mobile phone is higher, and the radiation risk to the human body is further increased. Therefore, how to solve the SAR problem of the 4G mobile phone becomes a new hot spot for research of many terminal manufacturers.
Currently, for the current 4G mobile phone, there are 2 main solutions for reducing SAR: 1) the matching of the antenna is adjusted, the hot spot distribution or the antenna radiation performance of the mobile phone antenna is changed, so that the purpose of reducing the SAR value of the mobile phone antenna is achieved, but the scheme can achieve the purpose of reducing the SAR value of the mobile phone antenna, but the time for debugging the antenna is inevitably increased, which is equivalent to the readjustment of the matched antenna, the workload of designers is increased, the research and development period of products is prolonged, the matching of the antenna is adjusted, and the OTA (Over-the-Air) performance of the mobile phone antenna is also reduced to a certain extent; 2) the SAR value of the mobile phone antenna is lower than the specified safety standard by opening a hot spot (hot-spot) or directly reducing the radio frequency output power. However, the direct reduction of the radio frequency output power also brings the reduction of the OTA performance of the mobile phone antenna, and meanwhile, the 3GPP has a requirement on the lower limit of the radio frequency output power, and when the SAR value exceeds the standard, the solution cannot effectively solve the problem that the SAR value exceeds the standard.
Disclosure of Invention
Accordingly, there is a need for a method, a mobile terminal and a computer-readable storage medium for effectively reducing the SAR value of a mobile phone without affecting the OTA performance of the mobile phone.
A method for reducing SAR is applied to a mobile terminal, wherein the mobile terminal comprises 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 a first side of the mobile terminal, and the second distance measuring device is arranged on a second side of the mobile terminal opposite to the first side; the method comprises the following steps:
the first ranging device detects the distance between the head of a user and the mobile terminal, and when the distance between the head of the user and the mobile terminal is smaller than or equal to a preset head distance threshold value, the transmitting power of a first antenna which works is reduced according to a head backspace parameter so as to meet the requirement of the mobile terminal on the SAR value of the head;
and the second distance measuring device detects the distance between the body of the user and the mobile terminal, and reduces the transmitting power of a working second antenna according to the body rollback parameter when the distance between the body of the user and the mobile terminal is less than or equal to a preset body distance threshold value so as to meet the SAR value requirement of the mobile terminal on the body.
In one embodiment, the method further comprises the following steps:
responding to a triggered network event, and acquiring the current geographic position of the mobile terminal;
obtaining SAR fallback parameters matched with the geographic location, wherein the SAR fallback parameters comprise the head fallback parameters and the body fallback parameters.
In one embodiment, the step of obtaining the current geographic location of the mobile terminal includes:
acquiring the code of the cell where the mobile terminal is currently located;
and acquiring a country code according to the code of the cell.
In one embodiment, after the step of reducing the transmission power of the first antenna operating according to the head back-off parameter, the method further includes:
the first ranging device detects the distance between the head of the user and the mobile terminal;
and when the distance between the head of the user and the mobile terminal is greater than the preset head distance threshold value, recovering the transmitting power of the working first antenna.
In one embodiment, the first antenna comprises at least one of a cellular antenna and a WiFi antenna, and the step of reducing the transmission power of the first antenna in operation according to a head back-off parameter when the distance between the head of the user and the mobile terminal is less than or equal to a preset head distance threshold value comprises:
if the cellular antenna works, when detecting that the distance between the head of the user and the mobile terminal is smaller than or equal to a preset first head distance threshold value, reducing the transmitting power of the working cellular antenna according to a first head back-off parameter;
if the WiFi antenna works, when the fact that the distance between the head of the user and the mobile terminal is smaller than or equal to a preset second head distance threshold value is detected, the transmitting power of the working WiFi antenna is reduced according to a second head back-off parameter;
and if the cellular antenna and the WiFi antenna work simultaneously, when detecting that the distance between the head of the user and the mobile terminal is smaller than or equal to a preset third head distance threshold value, reducing the transmitting power of at least one of the working cellular antenna and the working WiFi antenna according to a third head back-off parameter.
In one embodiment, after the step of reducing the transmission power of the second antenna operating according to the body back-off parameter, the method further comprises:
the second distance measuring device detects the distance between the body of the user and the mobile terminal;
and when the distance between the user body and the mobile terminal is greater than the preset body distance threshold value, recovering the transmitting power of the working second antenna.
In one embodiment, the second antenna comprises at least one of a cellular antenna and a WiFi antenna, and the step of reducing the transmission power of the second antenna operating according to a body backoff parameter when the distance between the user body and the mobile terminal is less than or equal to a preset body distance threshold comprises:
if the cellular antenna works, when the fact that the distance between the user body and the mobile terminal is smaller than or equal to a preset first body distance threshold value is detected, the transmitting power of the working cellular antenna is reduced according to a first body backspacing parameter;
if the WiFi antenna works, when the fact that the distance between the body of the user and the mobile terminal is smaller than or equal to a preset second body distance threshold value is detected, the transmitting power of the working WiFi antenna is reduced according to a second body back-off parameter;
and if the cellular antenna and the WiFi antenna work simultaneously, when detecting that the distance between the user body and the mobile terminal is smaller than or equal to a preset third body distance threshold value, reducing the transmitting power of at least one of the working cellular antenna and the WiFi antenna according to a third body back-off parameter.
In another aspect, the present invention further provides a mobile terminal, including:
a first antenna;
a second antenna;
the first distance measuring device is arranged at the first side of the mobile terminal and used for detecting the distance between the head of a user and the mobile terminal and generating a head distance signal;
the second distance measuring device is arranged on a second side, opposite to the first side, of the mobile terminal and used for detecting the distance between the body of the user and the mobile terminal and generating a body distance signal;
the control module is used for receiving the head distance signal and the body distance signal, and controlling the first working antenna to reduce the transmission power according to a head backspace parameter when the distance between the head of the user and the mobile terminal is less than or equal to a preset head distance threshold value so as to meet the SAR value requirement of the mobile terminal on the head; and when the distance between the body of the user and the mobile terminal is smaller than or equal to a preset body distance threshold value, controlling the working second antenna to reduce the transmitting power according to the body rollback parameter so as to meet the SAR value requirement of the mobile terminal on the body.
In one embodiment, the first ranging device comprises a range sensor and the second ranging device comprises a SAR sensor.
In yet another aspect, the present invention also proposes a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method as set forth in any of the above embodiments.
The method for reducing the SAR is applied to the mobile terminal, the mobile terminal comprises 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 a first side of the mobile terminal, and the second distance measuring device is arranged on a second side of the mobile terminal, which is opposite to the first side. The first distance measuring device detects the distance between the head of the user and the mobile terminal, and when the distance between the head of the user and the mobile terminal is smaller than or equal to a preset head distance threshold value, the transmitting power of the first antenna which works is reduced according to the head backspace parameter so as to meet the requirement of the mobile terminal on the SAR value of the head. And the second distance measuring device detects the distance between the body of the user and the mobile terminal, and reduces the transmitting power of the working second antenna according to the body rollback parameter when the distance between the body of the user and the mobile terminal is less than or equal to a preset body distance threshold value so as to meet the SAR value requirement of the mobile terminal on the body. Therefore, the SAR value of the mobile terminal can be effectively reduced through the first ranging device and the second ranging device on the premise of not influencing the OTA performance of the mobile terminal.
Drawings
FIG. 1 is a flow diagram of a method for reducing SAR in one embodiment;
FIG. 2 is a flow chart of a method of reducing SAR in another embodiment;
FIG. 3 is a flow chart of a method of reducing SAR in yet another embodiment;
FIG. 4 is a diagram illustrating the location of an antenna of the mobile terminal according to an embodiment;
fig. 5 is a schematic diagram illustrating a position of an antenna of a mobile terminal in another embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the 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 flow chart of a method for reducing SAR in an embodiment.
In this embodiment, the method for reducing SAR is applied to a mobile terminal, where the mobile terminal includes a first antenna, a second antenna, a first ranging device and a second ranging device, the first ranging device is disposed on a first side of the mobile terminal (e.g., a top of the mobile terminal), and the second ranging device is disposed on a second side of the mobile terminal (e.g., a bottom of the mobile terminal) opposite to the first side. The human body comprises a head and a body, wherein a head backspacing parameter and a body backspacing parameter are stored in the mobile terminal in advance, the head backspacing parameter refers to a power value required to be reduced by the first antenna, and the unit is dBm; the body back-off parameter refers to the amount of power the second antenna needs to be reduced, in dBm.
The method for reducing SAR comprises the following steps:
the first ranging apparatus detects a distance between the head of the user and the mobile terminal S100.
The first ranging means detects a distance between the head of the user and the mobile terminal. If the distance between the head of the user and the mobile terminal is less than or equal to the preset head distance threshold, the process goes to step S200. In one embodiment, the first antenna comprises 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 held up for use by a user, i.e. the top of the mobile terminal, and the second side of the mobile terminal is the side designed to be held down for use by a user, i.e. the bottom of the mobile terminal.
And S200, reducing the transmitting power of the first antenna according to the head back-off parameter.
And reducing the transmitting power of the first antenna according to the head back-off parameter so as to meet the SAR value requirement of the mobile terminal on the head.
And S300, detecting the distance between the body of the user and the mobile terminal by the second distance measuring device.
Step S100 and step S300 are executed in parallel. The second ranging means detects a distance between the body of the user 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, step S400 is entered.
And S400, reducing the transmitting power of the second antenna according to the body backspacing parameter.
And reducing the transmitting power of the second antenna which works according to the body backspacing parameter so as to meet the SAR value requirement of the mobile terminal on the body.
The method for reducing the SAR is applied to the mobile terminal, the mobile terminal comprises 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 a first side of the mobile terminal, and the second distance measuring device is arranged on a second side of the mobile terminal, which is opposite to the first side. The first distance measuring device detects the distance between the head of the user and the mobile terminal, and when the distance between the head of the user and the mobile terminal is smaller than or equal to a preset head distance threshold value, the transmitting power of the first antenna which works is reduced according to the head backspace parameter so as to meet the requirement of the mobile terminal on the SAR value of the head. And the second distance measuring device detects the distance between the body of the user and the mobile terminal, and reduces the transmitting power of the working second antenna according to the body rollback parameter when the distance between the body of the user and the mobile terminal is less than or equal to a preset body distance threshold value so as to meet the SAR value requirement of the mobile terminal on the body. Therefore, the SAR value of the mobile terminal can be effectively reduced through the first ranging device and the second ranging device on the premise of not influencing the OTA performance of the mobile terminal.
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, where the mobile terminal includes a first antenna, a second antenna, a first ranging device and a second ranging device, the first ranging device is disposed on a first side of the mobile terminal, and the second ranging device is disposed on a second side of the mobile terminal opposite to the first side. The human body comprises a head and a body, wherein a head backspacing parameter and a body backspacing parameter are stored in the mobile terminal in advance, the head backspacing parameter refers to a power value required to be reduced by the first antenna, and the unit is dBm; the body back-off parameter refers to the amount of power the second antenna needs to be reduced, in dBm.
The method for reducing SAR comprises the following steps:
the first ranging apparatus detects a distance between the head of the user and the mobile terminal S100.
The first ranging means detects a distance between the head of the user and the mobile terminal. If the distance between the head of the user and the mobile terminal is less than or equal to the preset head distance threshold, the step S200 is entered, and if the distance between the head of the user and the mobile terminal is greater than the preset head distance threshold, the step S210 is entered. In one embodiment, the first antenna comprises 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 held up for use by a user, i.e. the top of the mobile terminal, and the second side of the mobile terminal is the side designed to be held down for use by a user, i.e. the bottom of the mobile terminal.
And S200, reducing the transmitting power of the first antenna according to the head back-off parameter.
And reducing the transmitting power of the first antenna according to the head back-off parameter so as to meet the SAR value requirement of the mobile terminal on the head. After step S200, returning to step S100, the first ranging device continues to detect the distance between the head of the user and the mobile terminal, and if the distance between the head of the user and the mobile terminal is less than or equal to the preset head distance threshold, the step S200 is entered, and the process is repeated.
S210, maintaining the transmission power of the first antenna.
If the distance between the head of the user and the mobile terminal is greater than the preset head distance threshold, the transmission power of the working first antenna is kept unchanged (the transmission power of the working first antenna is kept unchanged relative to the transmission power of the working first antenna reduced in the step S200), at this time, the distance between the head of the user and the mobile terminal is longer, and the transmission power of the first antenna meets the requirement of the mobile terminal on the SAR value of the head. After step S210, returning to step S100, the first ranging device continues to detect the distance between the head of the user and the mobile terminal, and if the distance between the head of the user and the mobile terminal is greater than the preset head distance threshold, the method goes to step S210, and then sequentially loops.
And S300, detecting the distance between the body of the user and the mobile terminal by the second distance measuring device.
Step S100 and step S300 are executed in parallel. The second ranging means detects a distance between the body of the user and the mobile terminal. If the distance between the user body and the mobile terminal is less than or equal to the preset body distance threshold, the step S400 is performed, and if the distance between the user body and the mobile terminal is greater than the preset body distance threshold, the step S410 is performed.
And S400, reducing the transmitting power of the second antenna according to the body backspacing parameter.
And reducing the transmitting power of the second antenna which works according to the body backspacing parameter so as to meet the SAR value requirement of the mobile terminal on the body. After step S400, returning to step S300, the second distance measuring device continues to detect the distance between the user 'S body and the mobile terminal, and if the distance between the user' S body and the mobile terminal is less than or equal to the preset body distance threshold, then step S400 is entered, and the process is repeated.
And S410, maintaining the transmitting power of the working second antenna.
If the distance between the user body and the mobile terminal is greater than the preset body distance threshold, the transmission power of the working second antenna is kept unchanged (the transmission power of the working second antenna is kept unchanged relative to the transmission power of the working second antenna reduced in the step S400), at this time, the distance between the user body and the mobile terminal is longer, and the transmission power of the second antenna meets the SAR value requirement of the mobile terminal on the body. After step S410, returning to step S300, the second distance measuring device continues to detect the distance between the user 'S body and the mobile terminal, and if the distance between the user' S body and the mobile terminal is greater than the preset body distance threshold, entering step S410, and sequentially cycling.
Referring to fig. 3, fig. 3 is a flow chart of a method for reducing SAR in yet another embodiment.
In this embodiment, the method for reducing SAR is applied to a mobile terminal, where the mobile terminal includes a first antenna, a second antenna, a first ranging device and a second ranging device, the first ranging device is disposed on a first side of the mobile terminal, and the second ranging device is disposed on a second side of the mobile terminal opposite to the first side. The human body comprises a head and a body, and the head backspace parameter and the body backspace parameter are stored in the mobile terminal in advance, and the method for reducing the SAR comprises the following steps:
s110, responding to the triggered network event, and acquiring the code of the cell where the mobile terminal is currently located.
The network event is an event which can trigger the mobile terminal to search for a network, and when the network event is triggered, the mobile terminal responds to the network event and acquires the code of the cell where the mobile terminal is located (acquires the current geographic position of the mobile terminal). The mobile terminal comprises mobile equipment such as a mobile phone and a tablet personal computer.
And S120, acquiring the country code according to the code of the cell.
Each country or region corresponds to a country code, namely the country code is unique, and the country code of the cell can be identified according to the code of the cell, so that the country is identified.
And S130, acquiring SAR backspacing parameters matched with the country code.
The SAR fallback parameters matched with the country code are stored in the mobile terminal in advance, and different countries correspond to different fallback parameters. The SAR back-off parameter is the power value that the antenna needs to be reduced in dBm to achieve the SAR standard. The SAR rollback parameters include a head rollback parameter and a body rollback parameter. The head back-off parameter refers to the power value that the first antenna needs to reduce in dBm in order to meet the SAR standard. The body back-off parameter is the amount of power that the second antenna needs to be reduced in dBm in order to meet the SAR standard.
For example, if the mobile terminal is in a country or region, such as the united states, that requires certification by FCC (Federal Communications Commission), the SAR fallback parameters matching the FCC are acquired; if the mobile terminal is in a country or region that requires CE (european union) authentication, such as a european union member country, the SAR fallback parameters matching the CE are acquired.
The first antenna and the second antenna each include at least one of a cellular antenna and a WiFi antenna, and at least one of the cellular antenna and the WiFi antenna operate. After acquiring the SAR fallback parameters matched with the country code, the method respectively proceeds to step S140 and step S170, and step S140 and step S170 are executed in parallel.
The first ranging device detects a distance between the head of the user and the mobile terminal S140.
The first ranging means detects a distance between the head of the user 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, the process proceeds to step S150. Referring to fig. 4 and 5, in an embodiment, the first distance measuring device includes a distance sensor (e.g., P sensor) for detecting a distance between the head of the user and the mobile terminal through the distance sensor (e.g., P sensor) in the mobile terminal, and the distance sensor (e.g., P sensor) is installed on the top of the mobile terminal.
And S150, reducing the transmitting power of the first antenna according to the head back-off parameter.
And according to the head back-off parameter obtained in the step S130, reducing the transmission power of the first antenna according to the head back-off parameter. The first antenna includes a cellular antenna and a WiFi antenna, at least one of which is operative.
In one embodiment, step S150 includes the following cases:
if only the cellular antenna works, when the distance between the head of the user and the mobile terminal is detected to be smaller than or equal to a preset first head distance threshold value, the transmitting power of the working cellular antenna is reduced according to the first head backspacing parameter so as to meet the requirement of the mobile terminal on the SAR value of the head when only the cellular antenna works. The first head back-off parameter is the power value that the cellular antenna needs to reduce when only the cellular antenna is operating, and the unit is dBm.
If only the WiFi antenna works, when the fact that the distance between the head of the user and the mobile terminal is smaller than or equal to a preset second head distance threshold value is detected, the transmitting power of the working WiFi antenna is reduced according to the second head back-off parameter, and therefore the requirement of the mobile terminal on the SAR value of the head when only the WiFi antenna works is met. The second header backoff parameter is a power value that the WiFi antenna needs to be reduced when only the WiFi antenna is operated, and the unit is dBm.
If the cellular antenna and the WiFi antenna work simultaneously, when the fact that the distance between the head of the user and the mobile terminal is smaller than or equal to a preset third head distance threshold value is detected, the transmitting power of at least one of the working cellular antenna and the working WiFi antenna is reduced according to a third head back-off parameter, and therefore the requirement of the mobile terminal on the SAR value of the head when the WiFi antenna and the cellular antenna work simultaneously is met. The third head back parameter is a power value that at least one of the cellular antenna and the WiFi antenna needs to be reduced when the cellular antenna and the WiFi antenna operate simultaneously, and the unit is dBm.
Please refer to fig. 4 and 5, in an embodiment, the cellular antennas include 4 cellular antennas, the antennas 1, 2, 3 and 4 are all cellular antennas, the antenna 5 is a GPS/WIFI antenna, and the antenna 6 is a WIFI/bluetooth antenna, because the power of the bluetooth antenna is very low, the SAR value of the whole mobile terminal is hardly affected, and the SAR value of the whole mobile terminal may not be considered when considering the SAR value of the whole mobile terminal. In one embodiment, antennas 1 and 2 are main antennas supporting different frequency bands, and antennas 3 and 4 are diversity antennas, but also have a transmitting function. The frequency bands supported by the antennas 1 and 3 are the same, and the frequency bands supported by the antennas 2 and 4 are the same. In one embodiment, the frequency bands of the WIFI antenna include 2.4GHZ and 5 GHZ. In fig. 4, any one of the antenna 1, the antenna 2, the antenna 3, the antenna 4, the antenna 5 and the antenna 6 works to affect the SAR value of the mobile terminal to the head; any one of the antenna 1, the antenna 2, the antenna 5 and the antenna 6 works to influence the SAR value of the mobile terminal to the body. The difference between fig. 5 and fig. 4 is that the positions of the antenna 4 and the antenna 6 are exchanged, so that in fig. 5 the antenna 4 affects not only the SAR value of the mobile terminal for the head but also the SAR value of the mobile terminal for the body, all the other things being equal.
The first ranging means detects a distance between the head of the user and the mobile terminal S160.
After step 150, the first ranging device continues to detect the distance between the head of the user and the mobile terminal, and if the distance between the head of the user and the mobile terminal is greater than the preset head distance threshold, which is equivalent to the distance between the head of the user and the mobile terminal being far away, the process goes to step S165.
And S165, restoring the transmitting power of the first antenna in operation.
If the distance between the user' S head and the mobile terminal is greater than the preset head distance threshold, the mobile terminal will recover the transmission power of the first antenna whose operation is reduced in step S150, so that the transmission power of the first antenna whose operation is reduced is recovered to the original initial value.
S170, the second ranging device detects a distance between the body of the user and the mobile terminal.
The second ranging means detects a distance between the body of the user 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, step S180 is entered. Referring to fig. 4 and 5, in an embodiment, the second distance measuring device includes a SAR sensor (SAR sensor), the distance between the body of the user and the mobile terminal is detected by the SAR sensor (SAR sensor) in the mobile terminal, the SAR sensor (SAR sensor) is installed inside the bottom of the mobile terminal, the SAR sensor belongs to a type of capacitance sensor, and when the body of the user approaches the bottom of the mobile terminal (four faces adjacent to the bottom), a capacitance value of the SAR sensor changes, so that the distance between the body of the user and the mobile terminal is determined by the capacitance value.
And S180, reducing the transmitting power of the second antenna which works according to the body backspacing parameter.
And reducing the transmitting power of the second antenna according to the body backspacing parameter obtained in the step S130. The second antenna includes a cellular antenna and a WiFi antenna, at least one of the cellular antenna and the WiFi antenna operating.
In one embodiment, step S180 includes the following cases:
if only the cellular antenna works, when the fact that the distance between the user body and the mobile terminal is smaller than or equal to a preset first body distance threshold value is detected, the transmitting power of the working cellular antenna is reduced according to the first body backspacing parameter, and the requirement of the mobile terminal on the SAR value of the body when only the cellular antenna works is met. The first body back-off parameter is the power value that the cellular antenna needs to reduce when only the cellular antenna is working, and the unit is dBm.
If only the WiFi antenna works, when the fact that the distance between the body of the user and the mobile terminal is smaller than or equal to a preset second body distance threshold value is detected, the transmitting power of the working WiFi antenna is reduced according to a second body rollback parameter, and the requirement of the mobile terminal on the SAR value of the body when only the WiFi antenna works is met. The second body back-off parameter is the power value that the WiFi antenna needs to be reduced when only the WiFi antenna is working, and the unit is dBm.
If the cellular antenna and the WiFi antenna work simultaneously, when the fact that the distance between the body of the user and the mobile terminal is smaller than or equal to a preset third body distance threshold value is detected, the transmitting power of at least one of the working cellular antenna and the working WiFi antenna is reduced according to a third body backspacing parameter, and therefore the requirement of the mobile terminal on the SAR value of the body when the WiFi antenna and the cellular antenna work simultaneously is met. The third body back-off parameter is a power value that at least one of the cellular antenna and the WiFi antenna needs to be reduced if the cellular antenna and the WiFi antenna are simultaneously operated, and the unit is dBm.
Please refer to fig. 4 and 5, in an embodiment, the cellular antennas include 4 cellular antennas, the antennas 1, 2, 3 and 4 are all cellular antennas, the antenna 5 is a GPS/WIFI antenna, and the antenna 6 is a WIFI/bluetooth antenna, because the power of the bluetooth antenna is very low, the SAR value of the whole mobile terminal is hardly affected, and the SAR value of the whole mobile terminal may not be considered when considering the SAR value of the whole mobile terminal. In one embodiment, antennas 1 and 2 are main antennas supporting different frequency bands, and antennas 3 and 4 are diversity antennas, but also have a transmitting function. The frequency bands supported by the antennas 1 and 3 are the same, and the frequency bands supported by the antennas 2 and 4 are the same. In one embodiment, the frequency bands of the WIFI antenna include 2.4GHZ and 5 GHZ. In fig. 4, any one of the antenna 1, the antenna 2, the antenna 3, the antenna 4, the antenna 5 and the antenna 6 works to affect the SAR value of the mobile terminal to the head; any one of the antenna 1, the antenna 2, the antenna 5 and the antenna 6 works to influence the SAR value of the mobile terminal to the body. The difference between fig. 5 and fig. 4 is that the positions of the antenna 4 and the antenna 6 are exchanged, so that in fig. 5 the antenna 4 affects not only the SAR value of the mobile terminal for the head but also the SAR value of the mobile terminal for the body, all the other things being equal.
And S190, the second distance measuring device detects the distance between the body of the user and the mobile terminal.
After step 180, the second distance measuring device continues to detect the distance between the user ' S body and the mobile terminal, and if the distance between the user ' S body and the mobile terminal is greater than the preset body distance threshold, which is equivalent to the user ' S body being far away from the mobile terminal, the process proceeds to step 195.
And S195, recovering the transmission power of the second antenna in operation.
If the distance between the user' S body and the mobile terminal is greater than the preset body distance threshold, the mobile terminal will recover the transmitting power of the second antenna that is reduced in step S180, so that the transmitting power of the second antenna that is operating is recovered to the original initial value.
In one embodiment, for a method of meeting body SAR values in the Federal Communications Commission (FCC) of the united states, the method further comprises the steps of:
if the cellular antenna works, when the WiFi antenna is detected to work (which is equivalent to the opening of a WIFI hotspot), the transmitting power of the cellular antenna is reduced according to the body back-off parameter so as to meet the standard of the body SAR value of the Federal Transmission Commission (FCC). Namely, the WiFi antenna works as a condition for triggering to reduce the transmission power of the cellular antenna, and as long as the WiFi antenna works (which is equivalent to opening a WiFi hotspot), the transmission power of the cellular antenna is reduced all the time, and the original initial value of the cellular antenna is not recovered until the WiFi antenna is detected to be closed.
In the method for satisfying the body limit SAR value in the federal commission of the united states (FCC), the second distance measuring device is triggered to reduce the transmission power of the operating antenna through steps S170 to S195, but the distance threshold for triggering the second distance measuring device is different from that of the european union (CE).
The method for reducing the SAR acquires the country code by responding to the triggered network event on the premise of not influencing the OTA performance of the mobile terminal, further acquires the SAR backspace parameter matched with the country code, automatically reducing the transmitting power of the working antenna according to the triggering condition in the backspacing parameter, and recovering the transmitting power of the working antenna when the triggering condition is terminated, realizing the compatibility of SAR values of different countries, such as compliance with FCC/CE/IC (Industry Canada)/MIC (mandatory certification for information communication equipment and various radio frequency products by the Korean electric and electric wave communication method and electric wave method)/OFCA (Office of Communications authorities, China hong Kong Communications affairs administration)/Taile standard, therefore, the SAR value of the mobile terminal is effectively reduced, and the mobile terminal can meet the SAR value requirements of different countries on human bodies.
In another aspect, the present invention further provides a mobile terminal, including: the mobile terminal comprises a first antenna, a second antenna, a first distance measuring device, a second distance measuring device and a control module, wherein the human body comprises a head and a body, and a head backspacing parameter and a body backspacing parameter are stored in the mobile terminal in advance.
The first distance measuring device is arranged on the first side of the mobile terminal and used for detecting the distance between the head of the user and the mobile terminal and generating a head distance signal.
The second distance measuring device is arranged on a second side, opposite to the first side, of the mobile terminal and used for detecting the distance between the body of the user and the mobile terminal and generating a body distance signal.
The control module is used for receiving the head distance signal and the body distance signal, and controlling the working first antenna to reduce the transmitting power according to the head backspace parameter when the distance between the head of the user and the mobile terminal is less than or equal to a preset head distance threshold value so as to meet the SAR value requirement of the mobile terminal on the head; and when the distance between the body of the user and the mobile terminal is less than or equal to a preset body distance threshold value, controlling the working second antenna to reduce the transmitting power according to the body rollback parameter so as to meet the SAR value requirement of the mobile terminal on the body.
The mobile terminal comprises a first antenna, a second antenna, a first distance measuring device, a second distance measuring device and a control module, wherein the first distance measuring device is arranged on the first side of the mobile terminal and used for detecting the distance between the head of a user and the mobile terminal and generating a head distance signal. The second distance measuring device is arranged on a second side, opposite to the first side, of the mobile terminal and used for detecting the distance between the body of the user and the mobile terminal and generating a body distance signal. The control module is used for receiving the head distance signal and the body distance signal, and controlling the working first antenna to reduce the transmitting power according to the head backspace parameter when the distance between the head of the user and the mobile terminal is less than or equal to a preset head distance threshold value so as to meet the SAR value requirement of the mobile terminal on the head; and when the distance between the body of the user and the mobile terminal is less than or equal to a preset body distance threshold value, controlling the working second antenna to reduce the transmitting power according to the body rollback parameter so as to meet the SAR value requirement of the mobile terminal on the body. Therefore, the SAR value of the mobile terminal can be effectively reduced through the first ranging device, the second ranging device and the control module on the premise of not influencing the OTA performance of the mobile terminal.
In one embodiment, the control module is further configured to obtain a current geographic location of the mobile terminal in response to a triggered network event, and further obtain SAR fallback parameters matched with the geographic location, where the SAR fallback parameters include a head fallback parameter and a body fallback parameter. The network event is an event which can trigger the mobile terminal to search the network, and when the network event is triggered, the control module responds to the network event and acquires the current geographic position of the control module. The mobile terminal comprises mobile equipment such as a mobile phone and a tablet personal computer. The SAR back-off parameters matched with the geographic position are stored in the mobile terminal in advance, and different geographic positions correspond to different back-off parameters. The SAR rollback parameters include a head rollback parameter and a body rollback parameter. For example, if the mobile terminal is in a country or region, such as the united states, that requires certification by FCC (Federal Communications Commission), the SAR fallback parameters matching the FCC are acquired; if the mobile terminal is in a country or region that requires CE (european union) authentication, such as a european union member country, the SAR fallback parameters matching the CE are acquired.
In one embodiment, the control module is further configured to respond to a triggered network event, acquire a code of a cell where the mobile terminal is currently located, acquire a country code according to the code of the cell, and further acquire an SAR fallback parameter matched with the country code. The network event is an event which can trigger the mobile terminal to search for a network, and when the network event is triggered, the control module responds to the network event and acquires the code of the cell where the control module is currently located (acquires the current geographic position of the control module). Each country or region corresponds to a country code, namely the country code is unique, and the country code of the cell can be identified according to the code of the cell, so that the country is identified. The SAR fallback parameters matched with the country code are stored in the mobile terminal in advance, and different countries correspond to different fallback parameters. The SAR rollback parameters include a head rollback parameter and a body rollback parameter. For example, if the mobile terminal is in a country or region, such as the united states, that requires certification by FCC (Federal Communications Commission), the SAR fallback parameters matching the FCC are acquired; if the mobile terminal is in a country or region that requires CE (european union) authentication, such as a european union member country, the SAR fallback parameters matching the CE are acquired.
In one embodiment, the first ranging device is used for detecting the distance between the head of the user and the mobile terminal, generating a head distance signal and transmitting the head distance signal to the control module. The control module is used for receiving the head distance signal, and controlling the working first antenna to reduce the transmitting power according to the head backspace parameter when the distance between the head of the user and the mobile terminal is less than or equal to a preset head distance threshold value so as to meet the requirement of the mobile terminal on the SAR value of the head; when the distance between the head of the user and the mobile terminal is greater than the preset head distance threshold, the transmitting power of the first antenna for controlling work is kept unchanged (the transmitting power of the first antenna for controlling work is kept unchanged relative to the reduction of the transmitting power of the first antenna for controlling work), at this time, the distance between the head of the user and the mobile terminal is longer, and the transmitting power of the first antenna is kept unchanged to meet the SAR value requirement of the mobile terminal on the head. Then, the first distance measuring device continues to detect the distance between the head of the user and the mobile terminal, generates a head distance signal and transmits the head distance signal to the control module, and the steps are circulated in sequence.
The second distance measuring device is used for detecting the distance between the body of the user and the mobile terminal, generating a body distance signal and transmitting the body distance signal to the control module. The control module is used for receiving the body distance signal, and controlling the working second antenna to reduce the transmitting power according to the body backspacing parameter when the distance between the body of the user and the mobile terminal is less than or equal to a preset body distance threshold value so as to meet the SAR value requirement of the mobile terminal on the body; when the distance between the body of the user and the mobile terminal is greater than the preset body distance threshold value, the transmitting power of the second antenna for controlling work is kept unchanged (the transmitting power of the second antenna for controlling work is kept unchanged relative to the reduction of the transmitting power of the second antenna for controlling work), at the moment, the distance between the body of the user and the mobile terminal is longer, and the transmitting power of the second antenna is kept unchanged to meet the SAR value requirement of the mobile terminal on the body. Then, the second distance measuring device continues to detect the distance between the body of the user and the mobile terminal, generates a body distance signal and transmits the body distance signal to the control module, and the steps are circulated in sequence.
In one embodiment, the first ranging device is used for detecting the distance between the head of the user and the mobile terminal, generating a head distance signal and transmitting the head distance signal to the control module. The control module is used for receiving the head distance signal, when the distance between the head of the user and the mobile terminal is smaller than or equal to a preset head distance threshold value, the first antenna working is controlled to reduce the transmitting power according to the head backspace parameter so as to meet the requirement of the mobile terminal on the SAR value of the head, then the first distance measuring device continues to detect the distance between the head of the user and the mobile terminal, generates a head distance signal and transmits the head distance signal to the control module. The control module is used for receiving the head distance signal, and when the distance between the head of the user and the mobile terminal is greater than a preset head distance threshold value, the first antenna for controlling work restores the transmitting power to the original initial value (at this time, the first antenna for controlling work restores the transmitting power to the original initial value is relative to the situation that the first antenna for controlling work reduces the transmitting power).
The second distance measuring device is used for detecting the distance between the body of the user and the mobile terminal, generating a body distance signal and transmitting the body distance signal to the control module. The control module is used for receiving the body distance signal, when the distance between the body of the user and the mobile terminal is smaller than or equal to a preset body distance threshold value, the second antenna which works is controlled to reduce the transmitting power according to the body rollback parameter so as to meet the SAR value requirement of the mobile terminal on the body, then the second distance measuring device is continuously used for detecting the distance between the body of the user and the mobile terminal, generating a body distance signal and transmitting the body distance signal to the control module. The control module is used for receiving the body distance signal, and controlling the working second antenna to recover the transmitting power to the original initial value when the distance between the user body and the mobile terminal is larger than a preset body distance threshold value (at this time, the second antenna for controlling the working recovers the transmitting power to the original initial value is relative to the second antenna for controlling the working to reduce the transmitting power).
Please refer to fig. 4 and 5, in an embodiment, the cellular antennas include 4 cellular antennas, the antennas 1, 2, 3 and 4 are all cellular antennas, the antenna 5 is a GPS/WIFI antenna, and the antenna 6 is a WIFI/bluetooth antenna, because the power of the bluetooth antenna is very low, the SAR value of the whole mobile terminal is hardly affected, and the SAR value of the whole mobile terminal may not be considered when considering the SAR value of the whole mobile terminal. In one embodiment, antennas 1 and 2 are main antennas supporting different frequency bands, and antennas 3 and 4 are diversity antennas, but also have a transmitting function. The frequency bands supported by the antennas 1 and 3 are the same, and the frequency bands supported by the antennas 2 and 4 are the same. In one embodiment, the frequency bands of the WIFI antenna include 2.4GHZ and 5 GHZ.
Referring to fig. 4, in an embodiment, the first antenna includes any one of the antenna 1, the antenna 2, the antenna 3, the antenna 4, the antenna 5 and the antenna 6, and any one of the antenna 1, the antenna 2, the antenna 3, the antenna 4, the antenna 5 and the antenna 6, which is operated, affects the SAR value of the mobile terminal to the head; the second antenna comprises any one of the antenna 1, the antenna 2, the antenna 5 and the antenna 6, and the SAR value of the mobile terminal to the body can be influenced by the operation of any one of the antenna 1, the antenna 2, the antenna 5 and the antenna 6. The difference between fig. 5 and fig. 4 is that the positions of the antenna 4 and the antenna 6 are exchanged, so that in fig. 5 the antenna 4 affects not only the SAR value of the mobile terminal for the head but also the SAR value of the mobile terminal for the body, all the other things being equal.
In one embodiment, the first antenna comprises a cellular antenna and a WiFi antenna, at least one of the cellular antenna and the WiFi antenna operating. The process that the control module is used for controlling the first working antenna to reduce the transmitting power according to the head backspace parameter when the distance between the head of the user and the mobile terminal is less than or equal to the preset head distance threshold value comprises the following steps:
if only the cellular antenna works, when the control module detects that the distance between the head of the user and the mobile terminal is smaller than or equal to a preset first head distance threshold value, the control module controls the working cellular antenna to reduce the transmitting power according to the first head backspace parameter so as to meet the requirement of the mobile terminal on the SAR value of the head when only the cellular antenna works.
If only the WiFi antenna works, when the control module detects that the distance between the head of the user and the mobile terminal is smaller than or equal to a preset second head distance threshold value, the control module controls the working WiFi antenna to reduce the transmitting power according to the second head back-off parameter so as to meet the requirement of the mobile terminal on the SAR value of the head when only the WiFi antenna works.
If the cellular antenna and the WiFi antenna work simultaneously, when the control module detects that the distance between the head of the user and the mobile terminal is smaller than or equal to a preset third head distance threshold value, at least one of the working cellular antenna and the working WiFi antenna is controlled to reduce the transmission power according to a third head back-off parameter, so that the requirement of the mobile terminal on the SAR value of the head when the WiFi antenna and the cellular antenna work simultaneously is met.
In one embodiment, the second antenna comprises a cellular antenna and a WiFi antenna, at least one of the cellular antenna and the WiFi antenna operating. The process that the control module is used for controlling the working second antenna to reduce the transmitting power according to the body backspacing parameter when the distance between the body of the user and the mobile terminal is less than or equal to the preset body distance threshold value comprises the following steps:
if only the cellular antenna works, when the control module detects that the distance between the user body and the mobile terminal is smaller than or equal to a preset first body distance threshold value, the control module controls the working cellular antenna to reduce the transmitting power according to the first body backspace parameter so as to meet the requirement of the mobile terminal on the SAR value of the body when only the cellular antenna works.
If only the WiFi antenna works, when the control module detects that the distance between the body of the user and the mobile terminal is smaller than or equal to a preset second body distance threshold value, the control module controls the working WiFi antenna to reduce the transmitting power according to a second body rollback parameter so as to meet the requirement of the mobile terminal on the SAR value of the body when only the WiFi antenna works.
If the cellular antenna and the WiFi antenna work simultaneously, when the control module detects that the distance between the body of the user and the mobile terminal is smaller than or equal to a preset third body distance threshold value, at least one of the working cellular antenna and the working WiFi antenna is controlled to reduce the transmission power according to a third body backspacing parameter, so that the requirement of the mobile terminal on the SAR value of the body when the WiFi antenna and the cellular antenna work simultaneously is met.
In one embodiment, the first side of the mobile terminal is the side designed to be held up for use by a user, i.e. the top of the mobile terminal, and the second side of the mobile terminal is the side designed to be held down for use by a user, i.e. the bottom of the mobile terminal.
In one embodiment, the first ranging apparatus includes a distance sensor (e.g., P sensor) that detects a distance between the head of the user and the mobile terminal through the distance sensor (e.g., P sensor) in the mobile terminal and generates a head distance signal, and the distance sensor (e.g., P sensor) is mounted on the top of the mobile terminal.
In one embodiment, the second ranging device includes a SAR sensor (SAR sensor) that detects a distance between the body of the user and the mobile terminal through a SAR sensor (SAR sensor) in the mobile terminal, the SAR sensor (SAR sensor) being installed inside a bottom of the mobile terminal. The SAR sensor belongs to a capacitance sensor, and when the body of a user is close to the bottom (four surfaces adjacent to the bottom) of the mobile terminal, the capacitance value of the SAR sensor changes, so that the distance from the body of the user to the mobile terminal is judged through the capacitance value.
In one embodiment, the control module includes a processor.
The mobile terminal comprises a first antenna, a second antenna, a first distance measuring device, a second distance measuring device and a control module, wherein the first distance measuring device is arranged on the first side of the mobile terminal and used for detecting the distance between the head of a user and the mobile terminal and generating a head distance signal. The second distance measuring device is arranged on a second side, opposite to the first side, of the mobile terminal and used for detecting the distance between the body of the user and the mobile terminal and generating a body distance signal. The control module is used for responding to a triggered network event, acquiring the code of the cell where the mobile terminal is located currently, acquiring the country code according to the code of the cell, further acquiring an SAR back-off parameter matched with the country code, receiving the head distance signal and the body distance signal, automatically reducing the transmitting power of the working antenna according to a triggering condition in the back-off parameter, recovering the transmitting power of the working antenna when the triggering condition is terminated, and realizing the compatibility of SAR values of different countries. For example, it meets the compatibility of FCC/CE/IC (Industry Canada)/MIC (mandatory certification for information communication equipment and various radio frequency products by korean electrical communication law and radio wave law)/OFCA (Office of Communications authorities, china hong kong Communications affairs)/tel standard, thereby effectively reducing the SAR value of the mobile terminal and enabling the mobile terminal to meet the SAR value requirements of different countries for human bodies.
In yet another aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the method for reducing SAR in any of the above embodiments.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A method for reducing SAR is applied to a mobile terminal, and is characterized in that the mobile terminal comprises a first antenna, a second antenna, a first distance measuring device and a second distance measuring device, wherein the first distance measuring device is arranged on a first side of the mobile terminal, the second distance measuring device is arranged on a second side of the mobile terminal opposite to the first side, the first antenna is an antenna which influences the SAR value of the mobile terminal on the head of a user, and the second antenna is an antenna which influences the SAR value of the mobile terminal on the body of the user; the method comprises the following steps:
the first ranging device detects the distance between the head of a user and the mobile terminal, and when the distance between the head of the user and the mobile terminal is smaller than or equal to a preset head distance threshold value, the transmitting power of a first antenna which works is reduced according to a head backspace parameter so as to meet the requirement of the mobile terminal on the SAR value of the head;
and the second distance measuring device detects the distance between the body of the user and the mobile terminal, and reduces the transmitting power of a working second antenna according to the body rollback parameter when the distance between the body of the user and the mobile terminal is less than or equal to a preset body distance threshold value so as to meet the SAR value requirement of the mobile terminal on the body.
2. The method for reducing SAR of claim 1, further comprising:
responding to a triggered network event, and acquiring the current geographic position of the mobile terminal;
obtaining SAR fallback parameters matched with the geographic location, wherein the SAR fallback parameters comprise the head fallback parameters and the body fallback parameters.
3. The method for reducing SAR of claim 2, wherein the step of obtaining the current geographic location of the mobile terminal comprises:
acquiring the code of the cell where the mobile terminal is currently located;
and acquiring a country code according to the code of the cell.
4. The method for reducing SAR of claim 1, wherein the step of reducing the transmit power of the first antenna operating according to the head back-off parameter is followed by further comprising:
the first ranging device detects the distance between the head of the user and the mobile terminal;
and when the distance between the head of the user and the mobile terminal is greater than the preset head distance threshold value, recovering the transmitting power of the working first antenna.
5. The method of claim 1, wherein the first antenna comprises at least one of a cellular antenna and a WiFi antenna, and wherein the step of reducing the transmission power of the operating first antenna according to a head back-off parameter when the distance between the user's head and the mobile terminal is less than or equal to a preset head distance threshold comprises:
if the cellular antenna works, when detecting that the distance between the head of the user and the mobile terminal is smaller than or equal to a preset first head distance threshold value, reducing the transmitting power of the working cellular antenna according to a first head back-off parameter;
if the WiFi antenna works, when the fact that the distance between the head of the user and the mobile terminal is smaller than or equal to a preset second head distance threshold value is detected, the transmitting power of the working WiFi antenna is reduced according to a second head back-off parameter;
and if the cellular antenna and the WiFi antenna work simultaneously, when detecting that the distance between the head of the user and the mobile terminal is smaller than or equal to a preset third head distance threshold value, reducing the transmitting power of at least one of the working cellular antenna and the working WiFi antenna according to a third head back-off parameter.
6. The method for reducing SAR of claim 1, wherein the step of reducing the transmit power of the second antenna operating in accordance with the body backoff parameter is followed by:
the second distance measuring device detects the distance between the body of the user and the mobile terminal;
and when the distance between the user body and the mobile terminal is greater than the preset body distance threshold value, recovering the transmitting power of the working second antenna.
7. The method of reducing SAR of claim 1, wherein the second antenna comprises at least one of a cellular antenna and a WiFi antenna, and wherein the step of reducing the transmission power of the second antenna operating according to a body backoff parameter when the distance between the user's body and the mobile terminal is less than or equal to a preset body distance threshold comprises:
if the cellular antenna works, when the fact that the distance between the user body and the mobile terminal is smaller than or equal to a preset first body distance threshold value is detected, the transmitting power of the working cellular antenna is reduced according to a first body backspacing parameter;
if the WiFi antenna works, when the fact that the distance between the body of the user and the mobile terminal is smaller than or equal to a preset second body distance threshold value is detected, the transmitting power of the working WiFi antenna is reduced according to a second body back-off parameter;
and if the cellular antenna and the WiFi antenna work simultaneously, when detecting that the distance between the user body and the mobile terminal is smaller than or equal to a preset third body distance threshold value, reducing the transmitting power of at least one of the working cellular antenna and the WiFi antenna according to a third body back-off parameter.
8. A mobile terminal, comprising:
a first antenna, which is an antenna that affects the SAR value of the mobile terminal to the head of the user;
a second antenna that affects the SAR value of the mobile terminal to the user's body;
the first distance measuring device is arranged at the first side of the mobile terminal and used for detecting the distance between the head of a user and the mobile terminal and generating a head distance signal;
the second distance measuring device is arranged on a second side, opposite to the first side, of the mobile terminal and used for detecting the distance between the body of the user and the mobile terminal and generating a body distance signal;
the control module is used for receiving the head distance signal and the body distance signal, and controlling the first working antenna to reduce the transmission power according to a head backspace parameter when the distance between the head of the user and the mobile terminal is less than or equal to a preset head distance threshold value so as to meet the SAR value requirement of the mobile terminal on the head; and when the distance between the body of the user and the mobile terminal is smaller than or equal to a preset body distance threshold value, controlling the working second antenna to reduce the transmitting power according to the body rollback parameter so as to meet the SAR value requirement of the mobile terminal on the body.
9. The mobile terminal of claim 8, wherein the first ranging device comprises a range sensor and the second ranging device comprises a SAR sensor.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
CN201810742534.XA 2018-07-09 2018-07-09 Method for reducing SAR, mobile terminal and computer readable storage medium Active CN108601073B (en)

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