WO2020171243A1

WO2020171243A1 - Mobile terminal having multiple power amplifiers and transmission antennas, and mobile terminal control method

Info

Publication number: WO2020171243A1
Application number: PCT/KR2019/001919
Authority: WO
Inventors: 조은빛; 강영희; 박준규
Original assignee: 엘지전자 주식회사
Priority date: 2019-02-18
Filing date: 2019-02-18
Publication date: 2020-08-27

Abstract

The present invention relates to a mobile terminal including multiple power amplifiers (PAs) and transmission antennas in order to support uplink multi-input multi-output (UL MIMO), the mobile terminal comprising: multiple antennas including two antennas used for both transmission and reception; two PAs which are respectively connected to the two antennas and which amplify and output signals to be transmitted from the two antennas according to an input current; a power supply unit for supplying a current for driving the two PAs; a temperature sensing unit for sensing the temperature of each of the two PAs; and a control unit for, when receiving a control message of a base station, which requests the transmission of data through one antenna, selecting a first PA on the basis of the transmission power headroom of each of the two PAs, controlling the power supply unit so that a current is supplied only to the selected first PA, and controlling the power supply unit so that, in a state in which a current is supplied to the first PA, the current supplied to the first PA is blocked on the basis of the temperature of the first PA and the current is supplied to a second PA that is different from the first PA.

Description

A mobile terminal having a plurality of power amplifiers and transmission antennas, and a method for controlling the mobile terminal

The present invention relates to a mobile terminal including a plurality of PAs and transmission antennas, and more particularly, to a mobile terminal supporting UL MIMO (Up Link Multi-Input Multi-Output).

Recently, a wireless communication system using LTE communication technology has been commercialized for mobile terminals, providing various services. In addition, in the future, wireless communication systems using 5G communication technology are expected to be commercialized and provide various services. Meanwhile, some of the LTE frequency bands may be allocated to provide 5G communication services.

In the case of the 5G network communication, as the data transmission rate increases, more improved data transmission is required not only for a download link but also an uplink. Accordingly, a typical mobile terminal currently capable of supporting 5G communication uses a plurality of the plurality of antennas for both data reception and transmission to improve the data transmission accuracy of the mobile terminal or to secure wider transmission coverage. The way to do this was studied. And as a result of this study, the UL MIMO (Up Link Multi-Input Multi-Output) method appeared. The UL MIMO scheme allows a plurality of transmission antennas to transmit the same data, and has an advantage in that data can be transmitted more efficiently.

Meanwhile, this UL MIMO scheme can be selectively used. For example, when the channel environment between the mobile terminal and the base station is good, the base station can significantly reduce the data loss rate by transmitting data according to the UL MIMO method. However, in the UL MIMO method, as described above, a plurality of transmission antennas simultaneously transmit data, and the data transmission power of the mobile terminal is determined according to the sum power determined by the transmission power of each of the plurality of antennas. Can be determined. Therefore, if the channel environment is not good, the UL MIMO method may be more efficient than a conventional method using one antenna, and thus, the current mobile terminal may use the UL MIMO method or one antenna at the request of the base station. The data may be transmitted to the base station by selectively using a single transmission method for transmitting a.

However, according to a more advanced data transmission request for an uplink, there is a demand for an improvement in transmission power for transmitting data from a mobile terminal. In this case, if the data transmission power is improved, more current must be supplied to the PA, and accordingly, the PA of the mobile terminal may generate higher heat.

In this case, according to the UL MIMO scheme, transmission power may be shared by a plurality of PAs. However, when data is transmitted according to the single transmission scheme, transmission power must be formed by one PA, and thus more current may be supplied to the PA than the UL MIMO scheme. Therefore, when the transmission power is improved, there is a problem that high heat may be generated in a specific part of the mobile terminal, for example, a part in which a PA is disposed, and accordingly, damage inside the device and injury to the user may occur.

An object of the present invention is to solve the above and other problems, and to provide a mobile terminal with low heat generation while improving transmission power when transmitting data in a single transmission method, and a control method for the mobile terminal. The purpose. Another object of the present invention is to provide a robot cleaner capable of autonomous driving by following a boundary of an avoidance area set by a user, and a control method of the robot cleaner.

According to an aspect of the present invention to achieve the above or other objects, a mobile terminal according to an embodiment of the present invention. A plurality of antennas including two antennas used for both transmission and reception, and two power amplifiers (PAs) each connected to the two antennas and amplifying and outputting signals to be transmitted from the two antennas according to an input current Wow, a power supply unit that supplies current for driving the two PAs, a temperature sensing unit that senses the temperature of each of the two PAs, and a control message from the base station requesting to transmit data through one antenna is received. In this case, the first PA is selected based on the transmission power headroom of each of the two PAs, and the power supply is controlled so that current is supplied only to the selected first PA, and current is supplied to the first PA. And a controller configured to control the power supply unit to cut off the current supplied to the first PA based on the temperature of the first PA and to supply current to a second PA different from the first PA.

In an embodiment, the control unit determines whether the second PA is usable when the temperature sensed by the first PA is higher than the first temperature in a state where current is supplied to the first PA. Further detection is performed based on the transmission power headroom, and when it is determined that the second PA is usable when the sensed temperature is higher than the first temperature, the current supplied to the first PA is cut off and the second PA is The power supply unit is controlled to supply current, and whether the second PA is usable or not is determined according to whether the transmission power headroom of the second PA is equal to or greater than a preset value.

In an embodiment, the control unit detects a temperature difference between the first PA and the second PA in a state where current is supplied to the second PA, and when the detected temperature difference is less than the second temperature, the two It is characterized in that the power supply is controlled to supply current to the two PAs alternately.

In an embodiment, the control unit, when the control message is received in a state in which data is transmitted through both antennas, is based on a temperature difference between the two PAs, according to a headroom of transmission power. It is characterized in that the power supply is controlled to supply current to only one of the PAs or to alternately supply current to the two PAs.

In one embodiment, the controller selects and selects any one PA based on the transmission power headroom of each of the two PAs when a preset time elapses when current is alternately supplied to the two PAs. It characterized in that the power supply is controlled to supply current only to the PA.

In one embodiment, the control unit supplies current to different PAs for each data transmission period of the mobile terminal, which is time division multiplexed according to a Time Division Duplex (TDD) method when current is alternately supplied to the two PAs. It characterized in that it controls the power supply to be.

In one embodiment, the first PA is a PA having a large transmit power headroom value among the two PAs.

In one embodiment, the control message is transmitted from the base station according to a channel environment determined by the base station based on data received from the mobile terminal when data is simultaneously transmitted from two antennas of the mobile terminal. It is characterized in that it is transmitted to the mobile terminal.

In one embodiment, the control unit calculates the transmission power headroom of each of the two PAs by subtracting the current transmission power value of each PA from each of the maximum transmission power headrooms preset for each PA. do.

In one embodiment, the maximum transmission power headrooms are maximum transmission power outputs set for each PA, and the current transmission power value of each PA is a transmission power controlled by a transmission power parameter included in the request of the base station. It is characterized by

In an embodiment, the two antennas used for both transmission and reception are antennas for transmitting or receiving signals of any one of n41 band, n77 band, n78 band, and n79 band according to the 5G NR (New Radio) protocol. It features.

In one embodiment, the control unit is a modem (MODEM), an application processor (AP), or a terminal control unit that controls the overall operation of the mobile terminal.

In order to achieve the above or other objects, according to an aspect of the present invention, in a control method of a mobile terminal in which a data transmission method is changed to a single transmission method according to an embodiment of the present invention, UL MIMO (Up Link Multi Input Multi Output) A first step of calculating transmission power headrooms for power amplifiers (PAs) of each of a plurality of transmission/reception channels provided for) and selecting a first PA based on the calculated transmission power headroom, and the selected first A second step of activating the first PA by supplying current to a PA, and performing data transmission through the activated first PA, and measuring the temperature of the first PA and the second PA different from the first PA. A third step of determining whether to be usable or not, according to a temperature measurement result of the first PA and a result of determining whether the second PA is usable, inactivating the first PA by blocking the current supplied to the first PA, and A fourth step of activating a second PA by supplying current to the second PA, a fifth step of transmitting data through the activated second PA, and the deactivated first PA and a second activated When the temperature difference of the PA is less than the first temperature, by alternately supplying current to the first PA and the second PA, and a sixth step of performing data transmission through different PAs at a predetermined period of time. To do.

In an embodiment, the preset time is a time corresponding to a data transmission period of the mobile terminal that is time division multiplexed according to a Time Division Duplex (TDD) method.

In an embodiment, in the sixth step, a sixth step of receiving a control message including a transmission power parameter for changing transmission power of different PAs from the base station for each data reception period of the time division multiplexed mobile terminal. Step -1 and step 6-2 of respectively controlling the transmission power of the first PA and the second PA according to each of the received transmission power parameters, and after a predetermined time elapses, the first PA and the second PA 2 Step 6-3 of recalculating the transmission power headrooms of each PA based on the respective controlled transmission power of the PA, and a 6th step of reselecting the first PA based on the recalculated transmission power headrooms It characterized in that it includes four steps.

In an embodiment, the first step comprises step 1-1 of measuring the temperature of the first PA and the second PA and calculating a difference between the measured temperature, and based on the difference between the measured temperature, Transmission power headrooms of each PA are calculated immediately, or transmission of each PA is performed after data transmission is performed through different PAs at a predetermined period of time by alternately supplying current to the first and second PAs It characterized in that it comprises a 1-2 step of calculating the power headrooms.

In an embodiment, whether the second PA is usable is determined according to whether or not the calculated transmission power headroom for the second PA is equal to or greater than a preset value.

The effects of the mobile terminal and the control method thereof according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, the present invention minimizes heat that may occur locally in the mobile terminal by switching and activating two PAs to transmit data when transmitting data according to a single transmission method. In addition, it has the effect of enabling stable communication.

In addition, the present invention allows a PA corresponding to a channel with a better channel environment to be preferentially activated based on the transmission power headroom calculated from each PA when data is transmitted according to a single transmission method. There is an effect of reducing the current consumption while minimizing the heat that may be generated locally.

1A is a block diagram illustrating a mobile terminal related to the present invention.

1B and 1C are exemplary views as viewed from different directions of an example of a mobile terminal related to the present invention.

2 is a block diagram illustrating a configuration of a wireless communication unit of a mobile terminal capable of operating in a plurality of wireless communication systems according to an embodiment of the present invention.

3A and 3B are conceptual diagrams illustrating a structure in which current is supplied to transmission/reception antennas and PAs of the transmission/reception antennas in the structure of the wireless communication unit of FIG. 2.

4 is a conceptual diagram illustrating an example in which data is exchanged between a mobile terminal and a base station according to an embodiment of the present invention.

5 is a flowchart illustrating an operation process of activating any one PA when data is transmitted in a single transmission method in a mobile terminal according to an embodiment of the present invention.

6 is a flowchart illustrating an operation process in which a PA is preferentially selected according to a calculated transmission power headroom in a mobile terminal according to an embodiment of the present invention.

FIG. 7 is an exemplary diagram showing examples of channels through which data is transmitted when one or two PAs among two PAs are switched to each other and activated in a mobile terminal according to an embodiment of the present invention.

8 is a graph showing a change in heat generation amount of a PA when data is transmitted in a single transmission method according to an embodiment of the present invention.

9 is a conceptual diagram illustrating an operation process of controlling a plurality of PAs according to an embodiment of the present invention.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but identical or similar elements are denoted by the same reference numerals regardless of reference numerals, and redundant descriptions thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used interchangeably in consideration of only the ease of preparation of the specification, and do not have meanings or roles that are distinguished from each other by themselves. In addition, in describing the embodiments disclosed in the present specification, when it is determined that a detailed description of related known technologies may obscure the subject matter of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all modifications included in the spirit and scope of the present invention It should be understood to include equivalents or substitutes.

Terms including ordinal numbers, such as first and second, may be used to describe various elements, but the elements are not limited by the terms. These terms are used only for the purpose of distinguishing one component from another component.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present application, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Mobile terminals described in this specification include mobile phones, smart phones, laptop computers, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation systems, and slate PCs. , Tablet PC (tablet PC), ultrabook (ultrabook), wearable device (wearable device, for example, smartwatch, glass-type terminal (smart glass), HMD (head mounted display)), etc. may be included. have.

However, it will be readily apparent to those skilled in the art that the configuration according to the embodiment described in the present specification may be applied to fixed terminals such as digital TV, desktop computer, digital signage, etc., except when applicable only to mobile terminals. .

1A to 1C, FIG. 1A is a block diagram illustrating a mobile terminal related to the present invention, and FIGS. 1B and 1C are conceptual diagrams of an example of a mobile terminal related to the present invention viewed from different directions.

The mobile terminal 100 includes a wireless communication unit 110, an input unit 120, a sensing unit 140, an output unit 150, an interface unit 160, a memory 170, a control unit 180, and a power supply unit 190. ), etc. The components shown in FIG. 1A are not essential for implementing the mobile terminal, and thus, the mobile terminal described in the present specification may have more or fewer components than those listed above.

More specifically, among the components, the wireless communication unit 110 may be configured between the mobile terminal 100 and the wireless communication system, between the mobile terminal 100 and another mobile terminal 100, or between the mobile terminal 100 and an external server. It may include one or more modules that enable wireless communication between. In addition, the wireless communication unit 110 may include one or more modules for connecting the mobile terminal 100 to one or more networks. Here, the one or more networks may be, for example, a 4G communication network and a 5G communication network.

The wireless communication unit 110 may include at least one of a 4G wireless communication module 111, a 5G wireless communication module 112, a short-range communication module 113, and a location information module 114.

The 4G wireless communication module 111 may transmit and receive 4G base stations and 4G signals through a 4G mobile communication network. At this time, the 4G wireless communication module 111 may transmit one or more 4G transmission signals to the 4G base station. In addition, the 4G wireless communication module 111 may receive one or more 4G reception signals from the 4G base station.

In this regard, an uplink (UL) multi-input multi-output (MIMO) may be performed by a plurality of 4G transmission signals transmitted to the 4G base station. In addition, a downlink (DL) multi-input multiple output (MIMO) may be performed by a plurality of 4G reception signals received from a 4G base station.

The 5G wireless communication module 112 may transmit and receive 5G base stations and 5G signals through a 5G mobile communication network. Here, the 4G base station and the 5G base station may have a non-stand-alone (NSA) structure. For example, the 4G base station and the 5G base station may have a co-located structure disposed at the same location within a cell. Alternatively, the 5G base station may be disposed in a separate location from the 4G base station in a stand-alone (SA) structure.

The 5G wireless communication module 112 may transmit and receive 5G base stations and 5G signals through a 5G mobile communication network. In this case, the 5G wireless communication module 112 may transmit one or more 5G transmission signals to the 5G base station. In addition, the 5G wireless communication module 112 may receive one or more 5G received signals from the 5G base station.

In this case, the 5G frequency band may use the same band as the 4G frequency band, and this may be referred to as LTE re-farming. On the other hand, as the 5G frequency band, the Sub6 band, which is a band below 6GHz, may be used.

On the other hand, a millimeter wave (mmWave) band may be used as a 5G frequency band to perform broadband high-speed communication. When the millimeter wave (mmWave) band is used, the mobile terminal 100 may perform beam forming for communication coverage expansion with a base station.

Meanwhile, regardless of the 5G frequency band, in a 5G communication system, a greater number of multiple input multiple outputs (MIMO) may be supported to improve transmission speed. In this regard, uplink (UL) MIMO may be performed by a plurality of 5G transmission signals transmitted to the 5G base station. In addition, downlink (DL) MIMO may be performed by a plurality of 5G reception signals received from the 5G base station.

Meanwhile, the wireless communication unit 110 may be in a dual connectivity (DC) state with a 4G base station and a 5G base station through the 4G wireless communication module 111 and the 5G wireless communication module 112. In this way, the dual connection between the 4G base station and the 5G base station may be referred to as EN-DC (EUTRAN NR DC). Here, EUTRAN is an Evolved Universal Telecommunication Radio Access Network, which means 4G wireless communication system, and NR is New Radio, which means 5G wireless communication system.

On the other hand, if the 4G base station and the 5G base station have a co-located structure, it is possible to improve throughput through inter-CA (Carrier Aggregation). In the -DC state, a 4G reception signal and a 5G reception signal may be simultaneously received through the 4G wireless communication module 111 and the 5G wireless communication module 112.

The short range communication module 113 is for short range communication, and includes Bluetooth™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, and NFC. Near field communication may be supported by using at least one of (Near Field Communication), Wi-Fi (Wireless-Fidelity), Wi-Fi Direct, and Wireless USB (Wireless Universal Serial Bus) technologies. The short-distance communication module 114 is, between the mobile terminal 100 and a wireless communication system, between the mobile terminal 100 and another mobile terminal 100, or between the mobile terminal 100 through a wireless area network (Wireless Area Networks). ) And a network in which another mobile terminal 100 or an external server is located may support wireless communication. The local area wireless communication network may be a wireless personal area network (Wireless Personal Area Networks).

Meanwhile, short-range communication between mobile terminals may be performed using the 4G wireless communication module 111 and the 5G wireless communication module 112. In an embodiment, short-range communication may be performed between mobile terminals through a device-to-device (D2D) method without passing through a base station.

Meanwhile, carrier aggregation (CA) using at least one of the 4G wireless communication module 111 and 5G wireless communication module 112 and the Wi-Fi communication module 113 for transmission speed improvement and communication system convergence (convergence) This can be done. In this regard, 4G + WiFi carrier aggregation (CA) may be performed using the 4G wireless communication module 111 and the Wi-Fi communication module 113. Alternatively, 5G + WiFi carrier aggregation (CA) may be performed using the 5G wireless communication module 112 and the Wi-Fi communication module 113.

The location information module 114 is a module for obtaining a location (or current location) of a mobile terminal, and representative examples thereof include a GPS (Global Positioning System) module or a WiFi (Wireless Fidelity) module. For example, if the mobile terminal utilizes the GPS module, it can acquire the location of the mobile terminal by using a signal transmitted from a GPS satellite. As another example, if the mobile terminal utilizes the Wi-Fi module, the mobile terminal may acquire the location of the mobile terminal based on information of the Wi-Fi module and a wireless access point (AP) that transmits or receives a wireless signal. If necessary, the location information module 115 may perform any function among other modules of the wireless communication unit 110 in order to obtain data on the location of the mobile terminal as a substitute or additionally. The location information module 115 is a module used to obtain the location (or current location) of the mobile terminal, and is not limited to a module that directly calculates or obtains the location of the mobile terminal.

Specifically, if the mobile terminal utilizes the 5G wireless communication module 112, the mobile terminal may acquire the location of the mobile terminal based on information of the 5G wireless communication module and the 5G base station transmitting or receiving a wireless signal. In particular, since the 5G base station in the mmWave band is deployed in a small cell having a narrow coverage, it is advantageous to obtain the location of the mobile terminal.

The input unit 120 includes a camera 121 or an image input unit for inputting an image signal, a microphone 122 for inputting an audio signal, or an audio input unit, and a user input unit 123 for receiving information from a user, for example, , A touch key, a mechanical key, etc.). The voice data or image data collected by the input unit 120 may be analyzed and processed as a user's control command.

The sensing unit 140 may include one or more sensors for sensing at least one of information in the mobile terminal, information on surrounding environments surrounding the mobile terminal, and user information. For example, the sensing unit 140 includes a proximity sensor 141, an illumination sensor 142, a touch sensor, an acceleration sensor, a magnetic sensor, and gravity. G-sensor, gyroscope sensor, motion sensor, RGB sensor, infrared sensor (IR sensor), fingerprint sensor (finger scan sensor), ultrasonic sensor (ultrasonic sensor) , Optical sensor (for example, camera (see 121)), microphone (microphone, see 122), battery gauge, environmental sensor (for example, barometer, hygrometer, thermometer, radiation detection sensor, It may include at least one of a heat sensor, a gas sensor, etc.), and a chemical sensor (eg, an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the mobile terminal disclosed in the present specification may combine and utilize information sensed by at least two or more of these sensors.

The output unit 150 is for generating an output related to visual, auditory or tactile sense, and includes at least one of the display unit 151, the sound output unit 152, the hap tip module 153, and the light output unit 154 can do. The display unit 151 may implement a touch screen by forming a layer structure or integrally with the touch sensor. Such a touch screen can function as a user input unit 123 that provides an input interface between the mobile terminal 100 and a user, and can provide an output interface between the mobile terminal 100 and a user.

The interface unit 160 serves as a passage between various types of external devices connected to the mobile terminal 100. The interface unit 160 connects a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, and a device equipped with an identification module. It may include at least one of a port, an audio input/output (I/O) port, an input/output (video I/O) port, and an earphone port. The mobile terminal 100 may perform appropriate control related to the connected external device in response to the connection of the external device to the interface unit 160.

In addition, the memory 170 stores data supporting various functions of the mobile terminal 100. The memory 170 may store a plurality of application programs or applications driven by the mobile terminal 100, data for operation of the mobile terminal 100, and commands. At least some of these application programs may be downloaded from an external server through wireless communication. In addition, at least some of these application programs may exist on the mobile terminal 100 from the time of delivery for basic functions of the mobile terminal 100 (eg, incoming calls, outgoing functions, message reception, and outgoing functions). Meanwhile, the application program may be stored in the memory 170, installed on the mobile terminal 100, and driven by the controller 180 to perform an operation (or function) of the mobile terminal.

In addition to the operation related to the application program, the controller 180 generally controls the overall operation of the mobile terminal 100. The controller 180 may provide or process appropriate information or functions to a user by processing signals, data, information, etc. input or output through the above-described components or by driving an application program stored in the memory 170.

Also, in order to drive an application program stored in the memory 170, the controller 180 may control at least some of the components examined together with FIG. 1A. Furthermore, in order to drive the application program, the controller 180 may operate by combining at least two or more of the components included in the mobile terminal 100 with each other.

Hereinafter, the controller 180 that controls the overall operation of the mobile terminal will be referred to as the terminal controller 180.

The power supply unit 190 receives external power and internal power under the control of the terminal controller 180 and supplies power to each of the components included in the mobile terminal 100. The power supply unit 190 includes a battery, and the battery may be a built-in battery or a replaceable battery. Hereinafter, the power supply unit 190 for supplying power to each of the components included in the mobile terminal 100 will be referred to as a terminal power supply unit 190.

At least some of the components may operate in cooperation with each other to implement an operation, control, or control method of a mobile terminal according to various embodiments described below. In addition, the operation, control, or control method of the mobile terminal may be implemented on the mobile terminal by driving at least one application program stored in the memory 170.

1B and 1C, the disclosed mobile terminal 100 includes a bar-shaped terminal body. However, the present invention is not limited thereto, and may be applied to various structures such as a watch type, a clip type, a glass type, or a folder type in which two or more bodies are relatively movably coupled, a flip type, a slide type, a swing type, and a swivel type. . Although it will relate to a specific type of mobile terminal, the description of a specific type of mobile terminal may be generally applied to other types of mobile terminals.

Here, the terminal body may be understood as a concept referring to the mobile terminal 100 as at least one aggregate.

The mobile terminal 100 includes a case (for example, a frame, a housing, a cover, etc.) forming an exterior. As shown, the mobile terminal 100 may include a front case 101 and a rear case 102. Various electronic components are disposed in an inner space formed by the combination of the front case 101 and the rear case 102. At least one middle case may be additionally disposed between the front case 101 and the rear case 102.

A display unit 151 is disposed on the front of the terminal body to output information. As illustrated, the window 151a of the display unit 151 may be mounted on the front case 101 to form the front surface of the terminal body together with the front case 101.

In some cases, electronic components may be mounted on the rear case 102 as well. Electronic components that can be mounted on the rear case 102 include a removable battery, an identification module, and a memory card. In this case, a rear cover 103 for covering the mounted electronic component may be detachably coupled to the rear case 102. Accordingly, when the rear cover 103 is separated from the rear case 102, the electronic components mounted on the rear case 102 are exposed to the outside. Meanwhile, a part of the side surface of the rear case 102 may be implemented to operate as a radiator.

As shown, when the rear cover 103 is coupled to the rear case 102, a part of the side surface of the rear case 102 may be exposed. In some cases, when the rear case 102 is combined, the rear case 102 may be completely covered by the rear cover 103. Meanwhile, the rear cover 103 may be provided with an opening for exposing the camera 121b or the sound output unit 152b to the outside.

The mobile terminal 100 includes a display unit 151, first and second

sound output units

152a and 152b, a proximity sensor 141, an illuminance sensor 142, a light output unit 154, and first and second sound output units.

Cameras

121a and 121b, first and second operation units 123a and 123b, microphone 122, interface unit 160, and the like may be provided.

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, the display unit 151 may display execution screen information of an application program driven in the mobile terminal 100, or UI (User Interface) and GUI (Graphic User Interface) information according to such execution screen information. .

In addition, two or more display units 151 may exist depending on the implementation type of the mobile terminal 100. In this case, the mobile terminal 100 may have a plurality of display units spaced apart or integrally disposed on one surface, or may be disposed on different surfaces.

The display unit 151 may include a touch sensor that senses a touch on the display unit 151 so as to receive a control command by a touch method. Using this, when a touch is made to the display unit 151, the touch sensor may sense the touch, and the terminal controller 180 may be configured to generate a control command corresponding to the touch based on this. Content input by the touch method may be letters or numbers, or menu items that can be indicated or designated in various modes.

As such, the display unit 151 may form a touch screen together with a touch sensor, and in this case, the touch screen may function as a user input unit 123 (see FIG. 1A). In some cases, the touch screen may replace at least some functions of the first manipulation unit 123a.

The first sound output unit 152a may be implemented as a receiver that transmits a call sound to the user's ear, and the second sound output unit 152b is a loud speaker that outputs various alarm sounds or multimedia reproduction sounds. ) Can be implemented.

The light output unit 154 is configured to output light for notifying when an event occurs. Examples of the event include message reception, call signal reception, missed call, alarm, schedule notification, e-mail reception, and information reception through an application. When a user's event confirmation is detected, the terminal controller 180 may control the light output unit 154 to terminate the output of light.

The first camera 121a processes an image frame of a still image or moving picture obtained by an image sensor in a photographing mode or a video call mode. The processed image frame may be displayed on the display unit 151 and may be stored in the memory 170.

The first and second manipulation units 123a and 123b are an example of a user input unit 123 that is manipulated to receive a command for controlling the operation of the mobile terminal 100, and may also be collectively referred to as a manipulating portion. have. The first and second operation units 123a and 123b may be employed in any manner as long as the user operates while receiving a tactile feeling such as touch, push, and scroll. In addition, the first and second manipulation units 123a and 123b may also be employed in a manner in which the first and second manipulation units 123a and 123b are operated without a user's tactile feeling through proximity touch, hovering touch, or the like.

Meanwhile, the mobile terminal 100 may be provided with a fingerprint recognition sensor for recognizing a user's fingerprint, and the terminal controller 180 may use fingerprint information detected through the fingerprint recognition sensor as an authentication means. The fingerprint recognition sensor may be embedded in the display unit 151 or the user input unit 123.

The microphone 122 is configured to receive a user's voice and other sounds. The microphone 122 may be provided in a plurality of locations and configured to receive stereo sound.

The interface unit 160 becomes a passage through which the mobile terminal 100 can be connected to an external device. For example, the interface unit 160 is a connection terminal for connection with other devices (eg, earphones, external speakers), a port for short-range communication (eg, an infrared port (IrDA Port), a Bluetooth port (Bluetooth Port), a wireless LAN port, etc.], or at least one of a power supply terminal for supplying power to the mobile terminal 100. The interface unit 160 may be implemented in the form of a socket for accommodating an external card such as a subscriber identification module (SIM) or a user identity module (UIM), or a memory card for storing information.

A second camera 121b may be disposed on the rear surface of the terminal body. In this case, the second camera 121b has a photographing direction substantially opposite to that of the first camera 121a.

The second camera 121b may include a plurality of lenses arranged along at least one line. The plurality of lenses may be arranged in a matrix format. Such a camera may be referred to as an array camera. When the second camera 121b is configured as an array camera, an image may be photographed in various ways using a plurality of lenses, and an image of better quality may be obtained.

The flash 124 may be disposed adjacent to the second camera 121b. When a subject is photographed by the second camera 121b, the flash 124 illuminates light toward the subject.

A second sound output unit 152b may be additionally disposed on the terminal body. The second sound output unit 152b may implement a stereo function together with the first sound output unit 152a, and may be used to implement a speakerphone mode during a call.

At least one antenna for wireless communication may be provided in the terminal body. The antenna may be embedded in the terminal body or may be formed in a case. Meanwhile, a plurality of antennas connected to the 4G wireless communication module 111 and the 5G wireless communication module 112 may be disposed on the side of the terminal. Alternatively, the antenna may be formed in a film type and attached to the inner surface of the rear cover 103, or a case including a conductive material may be configured to function as an antenna.

Meanwhile, four or more antennas disposed on the side of the terminal may be implemented to support MIMO. In addition, when the 5G wireless communication module 112 operates in a millimeter wave (mmWave) band, since each of the plurality of antennas is implemented as an array antenna, a plurality of array antennas may be disposed in the mobile terminal.

The terminal body is provided with a terminal power supply unit 190 (see FIG. 1A) for supplying power to the mobile terminal 100. The terminal power supply unit 190 may include a battery 191 built in the terminal body or configured to be detachable from the outside of the terminal body.

Hereinafter, a structure of a multiplex transmission system according to the present invention and a mobile terminal having the same, particularly a power amplifier in a heterogeneous radio system, and embodiments related to a mobile terminal having the same will be described with reference to the accompanying drawings. It is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention.

2 shows the configuration of a wireless communication unit of a mobile terminal capable of operating in a plurality of wireless communication systems according to the present invention. Referring to FIG. 2, the mobile terminal includes a first power amplifier 210, a second power amplifier 220 and an RFIC 250. In addition, the mobile terminal may further include a modem (Modem) 270 and an application processor (AP) 280. Here, the modem (Modem, 270) and the application processor (AP, 280) are physically implemented in one chip, and may be implemented in a logical and functional separate form. However, the present invention is not limited thereto and may be implemented in the form of a physically separated chip according to an application.

Meanwhile, the mobile terminal includes a plurality of low noise amplifiers (LNAs) 261 to 264 in the receiver. Here, the first power amplifier 210, the second power amplifier 220, the RFIC 250, and the plurality of low noise amplifiers 261 to 264 are all operable in the first communication system and the second communication system. In this case, the first communication system and the second communication system may be a 4G communication system and a 5G communication system, respectively.

As shown in FIG. 2, the RFIC 250 may be configured as a 4G/5G integrated type, but is not limited thereto and may be configured as a 4G/5G separate type according to an application. When the RFIC 250 is configured as a 4G/5G integrated type, it is advantageous in terms of synchronization between 4G/5G circuits and has an advantage that control signaling by the modem 270 can be simplified.

Meanwhile, when the RFIC 250 is configured as a 4G/5G separate type, it may be referred to as a 4G RFIC and a 5G RFIC, respectively. In particular, when the 5G band and the 4G band have a large difference in bands, such as when the 5G band is configured as a millimeter wave band, the RFIC 250 may be configured as a 4G/5G separate type. In this way, when the RFIC 250 is configured as a 4G/5G separate type, there is an advantage that RF characteristics can be optimized for each of the 4G band and the 5G band.

Meanwhile, even when the RFIC 250 is configured as a 4G/5G separate type, the 4G RFIC and the 5G RFIC may be logically and functionally separated, and may be physically implemented on one chip.

Meanwhile, the application processor (AP) 280 is configured to control the operation of each component of the mobile terminal. Specifically, the application processor (AP, 280) may control the operation of each component of the mobile terminal through the modem 270.

For example, the application processor (AP, 280) may control the modem 270 through a power management IC (PMIC) for low power operation of the mobile terminal. Accordingly, the modem 270 may operate the power circuit of the transmitter and the receiver through the RFIC 250 in a low power mode.

In this regard, when it is determined that the mobile terminal is in an idle mode, the application processor (AP) 280 may control the RFIC 250 through the modem 270 as follows. For example, if the mobile terminal is in a standby mode (idle mode), at least one of the first and second power amplifiers (110, 120) to operate in a low power mode or off (off) RFIC through the modem 270 250 can be controlled.

According to another embodiment, when the mobile terminal is in a low power mode, the application processor (AP) 280 may control the modem 270 to provide wireless communication capable of low power communication. For example, when a mobile terminal is connected to a plurality of entities among a 4G base station, a 5G base station, and an access point, the application processor (AP) 280 may control the modem 270 to enable wireless communication with the lowest power. Accordingly, even though the throughput is slightly sacrificed, the application processor (AP) 280 may control the modem 270 and the RFIC 250 to perform short-range communication using only the short-range communication module 113.

According to another embodiment, when the remaining battery capacity of the mobile terminal is equal to or greater than a threshold, the modem 270 may be controlled to select an optimal wireless interface. For example, the application processor (AP, 280) may control the modem 270 to receive data through both the 4G base station and the 5G base station according to the remaining battery capacity and available radio resource information. In this case, the application processor (AP) 280 may receive information on the remaining battery capacity from the PMIC and information on available radio resources from the modem 270. Accordingly, if the remaining battery capacity and available radio resources are sufficient, the application processor (AP, 280) may control the modem 270 and the RFIC 250 to receive data through both the 4G base station and the 5G base station.

Meanwhile, in the multi-transceiving system of FIG. 2, the transmitting unit and the receiving unit of each radio system may be integrated into one transceiving unit. Accordingly, there is an advantage that a circuit part that integrates two types of system signals can be eliminated from the RF front-end.

In addition, since the front end parts can be controlled by the integrated transmission/reception unit, the front end parts can be integrated more efficiently than when the transmission/reception system is separated for each communication system.

In addition, when separated for each communication system, it is impossible to control other communication systems as necessary, or because a system delay is increased due to this, it is impossible to efficiently allocate resources. On the other hand, the multiple transmission/reception system as shown in FIG. 2 has an advantage of enabling efficient resource allocation since it is possible to control other communication systems as needed, and thereby minimize system delay.

Meanwhile, the first power amplifier 210 and the second power amplifier 220 may operate in at least one of the first and second communication systems. In this regard, when the 5G communication system operates in the 4G band or the Sub6 band, the first and second power amplifiers 220 can operate in both the first and second communication systems.

On the other hand, when the 5G communication system operates in the millimeter wave (mmWave) band, one of the first and

second power amplifiers

210 and 220 may operate in the 4G band and the other may operate in the millimeter wave band. have.

Meanwhile, by integrating the transmitting and receiving unit and the receiving unit, it is possible to implement two different wireless communication systems with a single antenna using a transmitting and receiving antenna. At this time, 4x4 MIMO can be implemented using four antennas as shown in FIG. 2. In this case, 4x4 DL MIMO may be performed through downlink (DL).

Meanwhile, if the 5G band is the Sub6 band, the first to fourth antennas ANT1 to ANT4 may be configured to operate in both the 4G band and the 5G band. On the other hand, if the 5G band is a millimeter wave (mmWave) band, the first to fourth antennas ANT1 to ANT4 may be configured to operate in any one of the 4G band and the 5G band. In this case, if the 5G band is a millimeter wave (mmWave) band, each of a plurality of separate antennas may be configured as an array antenna in the millimeter wave band.

Meanwhile, 2x2 MIMO can be implemented using two antennas connected to the first power amplifier 210 and the second power amplifier 220 among the four antennas. In this case, 2x2 UL MIMO (2 Tx) may be performed through uplink (UL). Alternatively, it is not limited to 2x2 UL MIMO, and may be implemented with 1 Tx or 4 Tx. In this case, when the 5G communication system is implemented with 1 Tx, only one of the first and

second power amplifiers

210 and 220 needs to operate in the 5G band. Meanwhile, when the 5G communication system is implemented with 4Tx, an additional power amplifier operating in the 5G band may be further provided. Alternatively, a transmission signal may be branched in each of one or two transmission paths, and the branched transmission signal may be connected to a plurality of antennas.

On the other hand, a switch-type splitter or power divider is built into the RFIC corresponding to the RFIC 250, so that separate parts do not need to be placed outside, thereby improving component mounting performance. I can. Specifically, it is possible to select the transmission unit (TX) of two different communication systems by using a single pole double throw (SPDT) type switch inside the RFIC corresponding to the control unit 250.

In addition, a mobile terminal capable of operating in a plurality of wireless communication systems according to the present invention may further include a duplexer 231, a filter 232, and a switch 233.

The duplexer 231 is configured to separate signals in the transmission band and the reception band from each other. In this case, a signal of a transmission band transmitted through the first and

second power amplifiers

210 and 220 may be applied to the antennas ANT1 and ANT4 through the first output port of the duplexer 231. On the other hand, a signal in the reception band received through the antennas ANT1 and ANT4 may be received by the

low noise amplifiers

261 and 264 through the second output port of the duplexer 231.

The filter 232 may be configured to pass a signal in a transmission band or a reception band and block signals in the remaining bands. In this case, the filter 232 may include a transmission filter connected to the first output port of the duplexer 231 and a reception filter connected to the second output port of the duplexer 231. Alternatively, the filter 232 may be configured to pass only a signal of a transmission band or only a signal of a reception band according to the control signal.

The switch 233 is configured to transmit only either a transmission signal or a reception signal. In an embodiment of the present invention, the switch 233 may be configured in the form of a single pole double throw (SPDT) so as to separate a transmission signal and a reception signal in a time division multiplexing (TDD) scheme. In this case, the transmission signal and the reception signal are signals of the same frequency band, and accordingly, the duplexer 231 may be implemented in the form of a circulator.

Meanwhile, in another embodiment of the present invention, the switch 233 is applicable to a frequency division multiplexing (FDD) scheme. In this case, the switch 233 may be configured in the form of a Double Pole Double Throw (DPDT) so as to connect or block a transmission signal and a reception signal, respectively. On the other hand, since the transmission signal and the reception signal can be separated by the duplexer 231, the switch 233 is not necessarily required.

Meanwhile, the mobile terminal according to the present invention may further include a modem 270 corresponding to the control unit. In this case, the RFIC 250 and the modem 270 may be referred to as a first control unit (or a first processor) and a second control unit (a second processor), respectively. Meanwhile, the RFIC 250 and the modem 270 may be implemented as physically separate circuits. Alternatively, the RFIC 250 and the modem 270 may be physically logically or functionally divided into one circuit.

The modem 270 may perform control and signal processing for transmission and reception of signals through different communication systems through the RFIC 250. The modem 270 may be obtained through control information received from a 4G base station and/or a 5G base station. Here, the control information may be received through a physical downlink control channel (PDCCH), but is not limited thereto.

The modem 270 may control the RFIC 250 to transmit and/or receive signals through the first communication system and/or the second communication system at a specific time and frequency resource. Accordingly, the RFIC 250 may control transmission circuits including the first and

second power amplifiers

210 and 220 to transmit a 4G signal or a 5G signal in a specific time period. Further, the RFIC 250 may control receiving circuits including the first to fourth low noise amplifiers 261 to 264 to receive 4G signals or 5G signals in a specific time period.

Meanwhile, detailed operations and functions of the mobile terminal according to the present invention equipped with the multiple transmission/reception system as shown in FIG. 2 will be described below.

3A and 3B are conceptual diagrams illustrating a structure in which a current is supplied to a transmission/reception antenna and a power amplifier of the transmission/reception antennas in the structure of the wireless communication unit of FIG. 2.

First, referring to FIG. 3A, a wireless communication unit of a mobile terminal according to an embodiment of the present invention may include four antennas (ANT 1, ANT 2, ANT 3 and ANT 4), of which two antennas (ANT 1, ANT 2) can be used as a transmission/reception antenna. Hereinafter, the two antennas ANT 1 and ANT 2 will be referred to as a first antenna and a second antenna, respectively.

Here, the first and second antennas may be formed to have a separation distance greater than or equal to a predetermined distance so as to exclude an influence due to interference between each other. Also, the first and second antennas may be antennas formed to transmit or receive 5G signals. In this case, the first and second antennas are n41 band (2496-2690 MHz), n77 band and n78 band (3300-4200 MHz and 3300-3800 MHz), n79 band (4400-5000 MHz) according to the 5G NR (New Radio) protocol. ) May be an antenna capable of transmitting or receiving a signal. In addition, the first and second antennas may be antennas for transmitting or receiving signals of the same frequency band.

In addition, the wireless communication unit of the mobile terminal according to an embodiment of the present invention may include a first power amplifier (PA) 210 and a second power amplifier 220 connected to the first antenna and the second antenna, respectively. I can. In addition, the first power amplifier 210 and the second power amplifier 220 may include a power supply unit 330 that supplies current for operation, and a control unit 350 that controls the power supply unit 330. .

First, the first and

second power amplifiers

210 and 220 may be connected to a first antenna and a second antenna, respectively, through a switch 233. In addition, transmission signals input from the RFIC 250 may be amplified into signals having a preset output level, that is, a power level. In addition, the amplified transmission signal may be output to a connected antenna. Accordingly, the first antenna or the second antenna may transmit a signal having the preset power level.

Meanwhile, the power supply unit 330 may supply current to each of the

power amplifiers

210 and 220. The power supply unit 330 may be a power management IC (PMIC). In addition, the first and

second power amplifiers

210 and 220 may amplify a signal input from the RFIC 250 based on the supplied current. In this case, each power amplifier may have different output levels of the amplified transmission signals, that is, transmission power levels, according to the amount of supplied current. For example, when the amount of supplied current increases, the transmission signal may be amplified with a signal having a higher power level, and when the amount of supplied current decreases, the transmission signal may be amplified with a signal having a lower power level. . That is, the first and

second power amplifiers

210 and 220 may change the power level of the transmission signal according to the amount of current supplied from the power supply unit 330.

Meanwhile, the control unit 350 may control the current supplied from the power supply unit 330 to each of the

power amplifiers

210 and 220. For example, the control unit 350 may selectively control the power supply unit 330 so that current is supplied to only one of the power amplifiers. The control unit 350 may be a modem (MODEM, 270) or an application processor (AP, 280). Alternatively, the controller 350 may be the terminal controller 180 that controls the overall operation of the mobile terminal.

When the data transmission method is changed to a single transmission method, the control unit 350 may select any one power amplifier to be activated. For example, the control unit 350 may select any one power amplifier based on the transmission power headroom of each power amplifier and control the power supply unit 330 so that current is supplied only to the selected one power amplifier. have. Here, the transmission power headroom refers to an output obtained by subtracting the current transmission power from a preset maximum transmission power according to the hardware characteristics of each power amplifier, and may mean a transmission output margin of the corresponding power amplifier. .

The controller 350 may calculate the transmit power headroom of each power amplifier and select any one power amplifier having a large transmit power headroom. In addition, the power supply unit 330 may be controlled so that current is supplied only to the selected power amplifier. In this case, the current supply to other power amplifiers that are not selected may be cut off. Accordingly, one selected power amplifier may be activated, and other power amplifiers not selected may be deactivated. Then, data can be transmitted only through an antenna connected to one of the activated power amplifiers. In this case, since current is continuously supplied to one of the activated power amplifiers, heat is continued, while current supply to the other deactivated power amplifier is cut off, thereby cooling due to a temperature difference with the surrounding air. In the following description, one power amplifier selected according to the difference in the transmission power headroom, that is, one of the first and

second power amplifiers

210 and 220 having a larger transmission power headroom value, is a first PA. The other power amplifier having a transmission power headroom value smaller than that of the first PA will be referred to as a second PA.

In a state in which the first PA is activated, the controller 350 may activate the second power amplifier based on whether a preset PA change condition is satisfied. Whether the PA change condition is satisfied may be determined according to the temperature of the currently activated power amplifier, that is, the first PA.

In this case, when the current temperature of the first PA exceeds a preset first temperature, the control unit 350 determines that the PA change condition is satisfied and blocks current supply to the first PA. In addition, the power supply unit 330 may be controlled to supply current to the second PA. Then, the first PA may be deactivated, and the second PA, which was in an inactive state, may be changed to an activated state. Then, data may be output through an antenna connected to the second PA.

Meanwhile, when the second PA is activated, the control unit 350 may measure the temperature of the first PA and the temperature of the second PA after a predetermined period of time has elapsed. And if the temperature of the first PA (T1) and the temperature of the second PA (T2) are less than a preset second temperature, the controller 350 alternately applies current to the first PA and the second PA at a preset time period. The power supply unit 330 may be controlled to supply. To this end, each power amplifier may be provided with a sensor unit 320 including at least one sensor. The sensor unit 320 may include a temperature sensor. In addition, the sensor unit 320 may include an output sensor for detecting an output level of a signal currently amplified by each power amplifier. In addition, at least one of the temperature measured by each temperature sensor and the transmission output size of the power amplifier measured by the output sensor may be input to the control unit 350.

The preset time period may be the same as a data transmission period of the mobile terminal that is time division multiplexed according to a Time Division Duplex (TDD) method. In this case, the controller 350 may change the power amplifier that is activated whenever the data transmission period arrives. Therefore, each time a data transmission period arrives, a transmission signal may be amplified by different power amplifiers, and data may be transmitted through different antennas. That is, whenever the data transmission period is changed, transmission signals may be output through different antenna paths (channels).

Meanwhile, when data is transmitted through different antennas every time the data transmission period arrives, the transmission power parameter for each antenna channel may be received from the base station whenever the data reception period arrives. Here, the transmission power parameter may include information on the strength of a signal received at the base station, and increases or decreases the transmission signal output of the mobile terminal according to the strength of the signal received at the base station. It may include control information for making it.

The first antenna connected to the first power amplifier 210 and the fourth antenna connected to the second power amplifier 220 may be disposed to be spaced apart by a predetermined distance or more to avoid interference between them. More preferably, as shown in FIG. 3B, the first antenna and the fourth antenna are disposed at opposite positions to each other in the vertical direction and/or the left and right directions of the mobile terminal, so that the maximum separation distance between them can be secured. have. In addition, the power supply unit 330 may supply current for driving to the first power amplifier 210 and the second power amplifier 220, respectively.

Meanwhile, the controller 350 may receive a temperature value from a temperature sensor provided in the sensor unit 320 of the first power amplifier 210 and the second power amplifier 220. In addition, an output size of a transmission signal may be input from an output sensor provided in the sensor unit 320. And for controlling to supply current to any one of the first power amplifier 210 and the second power amplifier 220 based on at least one of a transmission power headroom value and a temperature value calculated according to the output size of the transmission signal. A control signal may be input to the power supply unit 330.

Meanwhile, as shown in FIG. 3B, since the locations of antennas for transmitting data are different from each other, the channel environment for each antenna channel may be different. Accordingly, the strength of the signal received by the base station may be different, and accordingly, the transmission power parameter received from the base station may be different for each antenna channel. Then, the controller 350 may change the transmission power of the antenna to which the current data is transmitted according to the received transmission power parameter. Therefore, when transmission output parameters are received differently for each antenna channel, the sizes of the transmission signal output amplified by each power amplifier may be different from each other.

Meanwhile, when current is alternately supplied to the first PA and the second PA, the control unit 350 may recalculate the transmission power headroom of the two power amplifiers after a predetermined period of time has elapsed. In this case, values of the calculated transmission power headroom may also vary as the size of the transmission signal output amplified by each power amplifier is different. Accordingly, the control unit 350 may reselect any one power amplifier having a larger transmit power headroom value as the first PA, and may activate only one of the first PA again. And when the first PA is activated, the above-described process is performed again, and the second power amplifier is activated according to whether a preset PA change condition is satisfied, and based on the difference between the temperature of the first PA and the temperature of the second PA. The first PA and the second PA may cross each other to be activated.

Meanwhile, the PA change condition may further include whether the second PA is usable as well as the first PA temperature condition. For example, the control unit 350 may calculate the transmission power headroom of the second PA and determine whether the second PA is usable based on the calculated transmission power headroom value.

In this case, if the calculated transmission power headroom value is less than or equal to a preset value (eg, 0), the control unit 350 may determine that the second PA cannot be used. Then, the control unit 350 may suspend the change of the activated PA to the second PA for a predetermined time. Accordingly, when it is determined that the second PA is in a state that is currently unavailable, the state in which current is supplied to the first PA may be maintained even if the first temperature exceeds a preset first temperature.

Meanwhile, a base station performing communication with a mobile terminal according to an embodiment of the present invention may determine a channel environment between the mobile terminal and the base station based on data received from the mobile terminal. In addition, based on the determined channel environment, it is possible to request the mobile terminal to change the data transmission method. For example, the base station may detect a loss amount of data received from a mobile terminal using a UL MIMO method and determine a channel environment according to the detected data loss amount. Further, it may be requested to change the data transmission method to a single transmission method according to the determined channel environment. In this case, the base station may transmit a control message for changing a data transmission method, and the control message may include a changed data transmission method and a transmission power parameter corresponding thereto. Then, based on the control message received from the base station, the control unit 350 can change the data transmission method from the UL MIMO method in which data is simultaneously transmitted from a plurality of antennas to a single transmission method in which data is transmitted through one antenna. have. In addition, the first PA may be selected and activated based on the transmission power headroom value calculated from each of the power amplifiers, and the transmission output of the activated first PA may be controlled according to the transmission output parameter.

In this way, when a specific transmission power level is requested from the base station, the data exchange process between the base station and the mobile terminal, and the transmission power level requested from the base station, that is, the transmission formed by each power amplifier based on the integrated power level. The operation process of forming the power level will be described in more detail with reference to FIGS. 4 and 5 below.

First, referring to FIG. 4A, FIG. 4A shows a transmission/reception schedule of a mobile terminal subjected to time division multiplexing according to a Time Division Duplex (TDD) scheme. According to (a) of FIG. 4, the mobile terminal may transmit data to the base station at a signal transmission (TX) time 400 and may receive data from the base station at a signal reception (RX) time 410. Here, the signal transmission (TX) time 400 and the signal reception (RX) time 410 may be preset according to control data exchanged between the base station of the mobile terminal and the mobile terminal. In addition, there may be a predetermined switching period between the call transmission (TX) time 400 and the signal reception (RX) time 410.

In addition, (b) of FIG. 4 shows an example in which data is exchanged at the signal transmission (TX) time 400 and the signal reception (RX) time 410.

First, at the signal transmission time (TX) 400, data (TX data) may be transmitted from the mobile terminal 430 to the base station 420. In this case, if data is simultaneously transmitted through two antennas according to the UN MIMO scheme, two identical transmission data (TX data) may be transmitted.

Then, the base station 420 may determine a channel environment between the base station 420 and the mobile terminal 430 based on the received TX data. For example, the base station 420 may determine a channel environment between the base station 420 and the mobile terminal 430 based on the amount of loss of TX data received during the signal transmission time (TX) 400 (S452).

If, as a result of the base station 420 determining the channel environment in step S452, that data loss above a preset level has not occurred, the base station 420 may determine that the current channel environment is suitable for UL MIMO data transmission. . Then, the base station 420 may not generate a control message for changing the data transmission method, and accordingly, the control message may not be transmitted at the signal reception (RX) time 410. In this case, the mobile terminal 430 can maintain the UL MIMO scheme.

On the other hand, when a data loss of more than a preset level occurs in step S452, the base station 420 may determine that the current channel environment is not suitable for the UL MIMO communication method. Accordingly, the base station 420 may determine that it is necessary to change the data transmission method of the mobile terminal 430 (S452).

If, as a result of the determination in step S452, it is determined that the change of the data transmission method is necessary, the base station 420 may generate a control message requesting the change of the data transmission method (S454). In this case, the control message may include a parameter requesting to change the data transmission method to a single transmission method, and a transmission power parameter requesting an increase in the output of a transmission signal according to the change of the data transmission method.

Meanwhile, the control message may be transmitted together with data received from the base station 420 at a signal reception (RX) time 410 (S460). Then, the mobile terminal 430 may detect whether the control message is present among the received data (S462). When the control message is received, the data transmission method may be changed to a single transmission method, and the output of the power amplifier may be controlled to increase the output of the transmission signal according to the transmission output parameter (S464).

5 shows, in the case where the data transmission method is changed from the UL MIMO method to the single transmission method, in the mobile terminal according to the embodiment of the present invention, a power amplifier is selected and activated, and data is transmitted through the selected power amplifier. It is a flow chart showing the operation process.

Referring to FIG. 5, when the data transmission method is changed to a single transmission method, the control unit 350 may first calculate the transmission power headroom of each power amplifier (S500). Here, the transmission power headroom means the transmission output margin of each power amplifier, and the current transmission power at the maximum transmission power preset according to the hardware characteristics of each power amplifier. It can mean subtracted output. To this end, the maximum transmission powers preset for each power amplifier may be stored in the memory 170 in advance. In addition, the current transmission output of each power amplifier may be detected from a transmission signal output level detected from an output sensor of each power amplifier.

Meanwhile, when the transmission power headrooms of each power amplifier are calculated in step S500, the control unit 350 may select any one power amplifier as the first PA based on the calculated transmission power headroom values. For example, the control unit 350 may select any one power amplifier having a larger transmit power headroom value among the

power amplifiers

210 and 220 as the first PA. This is because a power amplifier having a large transmission power headroom value is a power amplifier whose transmission output is lower than that of the maximum transmission output, and the lower the transmission power is, the less current is supplied. In addition, the less current is supplied, the lower the amount of heat generated.

Here, the meaning that the value of the transmission power headroom is large may mean that the channel environment of the antenna connected to the power amplifier is better than that of other antennas. This means that the output of the transmission signal, that is, the output of the power amplifier, is determined according to the transmission output parameter received from the base station as described above, and the base station outputs the transmission signal through the transmission output parameter included in the control message as the channel environment is poor. This is because the increase is requested from the mobile terminal.

Meanwhile, when any one power amplifier is selected as the first PA, the controller 350 may control the power supply unit 330 so that current is supplied only to the selected first PA. Then, only the power amplifier selected as the first PA may be activated, and current supply to another power amplifier that is not selected, that is, the second PA, may be cut off and converted into an inactive state (S502).

When the first PA is activated in step S502, the controller 350 may amplify a transmission signal through the activated first PA for a preset time and output a transmission signal through an antenna connected to the first PA. In this case, the transmission power of the first PA may be controlled according to the transmission power parameter received from the base station.

Meanwhile, when a preset time elapses, the controller 350 may measure the temperature of the first PA. And it is possible to determine whether or not the second PA can be used. Here, the determination of whether the second PA can be used may be made according to the transmission power headroom value of the second PA. That is, as a result of calculating the transmission power headroom value of the second PA, if the calculated value is less than or equal to a preset value, the controller 350 may determine that the second PA is not usable. On the other hand, if the calculated value exceeds a preset value, the controller 350 may determine that the second PA is usable (S504).

Further, the controller 350 may determine whether the PA change condition is satisfied based on the measured temperature of the first PA and the determination result of whether the second PA is usable (S506). For example, the PA change condition may be satisfied when the second PA is usable while the temperature of the first PA exceeds the first temperature. In this case, if both conditions are not satisfied, the control unit 350 maintains a state in which the first PA is activated for a preset time, that is, a state in which current is supplied only to the first PA, and proceeds to step S504 again to It is possible to measure the temperature of the PA and determine whether the second PA can be used.

On the other hand, in step S506, when both of the above conditions are satisfied, the controller 350 may change the activated power amplifier. That is, the control unit 350 may deactivate the first PA by blocking the current supplied to the first PA, and may supply current to the second PA to convert the second PA in the deactivated state into the activated state. (S508).

Accordingly, a transmission signal may be amplified through the activated second PA, and a transmission signal may be transmitted through an antenna connected to the second PA. In this case, the transmission power of the second PA may be controlled according to the transmission power parameter received from the base station. Then, the deactivated first PA may be cooled due to a temperature difference with ambient air. Accordingly, the temperature of the deactivated first PA may gradually decrease, and the temperature of the second PA changed to the activated state may gradually increase.

In addition, the controller 350 may determine whether a preset time has elapsed (S510). In addition, when a preset time has elapsed, the temperature of the currently deactivated first PA and the temperature of the activated second PA may be measured (S512).

As a result of the measurement in step S512, if the difference between the temperature of the first PA and the temperature of the second PA is greater than or equal to a preset second temperature, the controller 350 is in a state in which the first PA is deactivated and the second PA again for a preset time. Can remain active. When a preset time has elapsed, steps S510 and S512 are performed again, and it may be determined whether the difference between the measured temperature of the first PA and the temperature of the second PA is equal to or greater than the second preset temperature.

On the other hand, if the difference between the temperature of the first PA and the temperature of the second PA is less than a preset second temperature as a result of the measurement in step S512, the control unit 350 alternates between the first PA and the second PA at a preset period of time. The power supply unit 330 may be controlled so that current is supplied (S516). In this case, the first PA and the second PA may be activated by crossing each other at a period of the preset time.

Meanwhile, the preset time period may be the same as a data transmission period of the mobile terminal, which is time division multiplexed according to a Time Division Duplex (TDD) method. In this case, the PA activated whenever the data transmission period arrives may be changed. Therefore, each time a data transmission period arrives, a transmission signal may be amplified by different power amplifiers, and data may be transmitted through different antennas.

That is, whenever the data transmission period is changed, transmission signals may be output through different antenna paths (channels). In this case, in a data reception period corresponding to each data transmission period, transmission output parameters for different antenna channels may be received. Then, the control unit 350 may control the transmission output of the power amplifier of each channel according to the transmission output parameter corresponding to each channel.

In addition, when a predetermined time elapses while the first PA and the second PA are activated by crossing each other in step S516, the controller 350 may proceed to step S500 again. Then, the control unit 350 may recalculate the transmission power headroom values of each power amplifier. Then, the process proceeds to step S502, and the first PA among the power amplifiers may be selected and activated again based on the calculated transmission power headroom values. In this case, the power amplifier not selected as the first PA may be the second PA. In addition, the controller 350 may perform the process of steps S504 to S516 again. The process of FIG. 5 may be repeatedly performed until a request for changing a data transmission scheme in the UL MIMO scheme is received from the base station.

Meanwhile, values of transmission power headroom calculated from each power amplifier in step S500 of FIG. 5 may be within a preset tolerance. In this case, the values of the transmission power headroom may be determined to be the same value. In this case, the control unit 350 may activate the first PA and the second PA by crossing each other for a predetermined period of time and control the transmission output of the power amplifier of each channel according to the transmission output parameter corresponding to each channel. Further, the transmission power headroom of each power amplifier is recalculated according to the controlled transmission output, and any one power amplifier may be selected as the first PA according to the result of the recalculation.

6 is a flowchart illustrating an operation process in which a PA is selected according to the calculated transmission power headroom in the mobile terminal according to an embodiment of the present invention in this case.

First, when values of transmission power headroom are calculated from each power amplifier in step S500 of FIG. 5, the control unit 350 may determine whether the calculated transmission power headroom values are the same (S600). For example, when the difference between the calculated transmission power headroom values is within a preset tolerance, the controller 350 may determine that the two values are the same. For example, when the data transmission method is changed to a single transmission method while operating according to the UL MIMO method, values of transmission power headroom calculated from each power amplifier may have the same value.

Meanwhile, if the values of the transmission power headroom calculated as a result of the determination in step S600 are the same, the control unit 350 alternately supplies current to the first PA and the second PA according to a preset data transmission period for a predetermined time. The power supply unit 330 can be controlled (S602). In this case, the first PA and the second PA may be activated by crossing each other in each data transmission period (S602).

In this case, transmission signals may be output through different antenna channels whenever the data transmission period is changed. In this case, in a data reception period corresponding to each data transmission period, transmission output parameters for different antenna channels may be received. Then, the control unit 350 may control the transmission output of the power amplifier of each channel according to the transmission output parameter corresponding to each channel (S604). In this case, since the transmission power is controlled differently according to the wireless environment of each channel, the transmission power of each power amplifier may be different from each other.

Further, the control unit 350 may recalculate the transmission power headroom of each power amplifier based on the power amplifier transmission output of each channel controlled according to the transmission output parameter corresponding to each channel (S606). Further, it may be determined again whether the recalculated transmission power headroom of each PA is the same (S608).

Meanwhile, as a result of the determination in step S608, if the recalculated transmission power headroom of each PA is the same, the control unit 350 may perform step S604 again in step S602. On the other hand, if the transmission power headroom of each PA recalculated as a result of the determination in step S608 is different from each other, a power amplifier having a larger transmission power headroom value may be selected as the first PA and current may be supplied only to the first PA. (S610). Then, the controller 350 measures the temperature of the first PA and determines whether the second PA is usable by proceeding to step S504 of FIG. 5 after a preset time elapses in the activated state of the first PA. I can.

On the other hand, if the determination result in step S600 is not the same as the transmission power headroom values, the control unit 350 proceeds directly to step S610 and selects a power amplifier having a larger transmission power headroom value as the first PA. have. Then, after a predetermined time elapses, the process proceeds to step S504 of FIG. 5 to measure the temperature of the first PA and determine whether the second PA is usable.

First, FIG. 7(a) shows an antenna (first channel) connected to the first PA when the first PA and the second PA cross and activate according to the data transmission period, as described in step S516 of FIG. 5, An example in which data is transmitted from a mobile terminal through an antenna (second channel) connected to a second PA is illustrated.

Referring to FIG. 7A, the first period 701 may be divided into a first data transmission period 721 and a first data reception period 711. In this case, if the first PA is activated in the first data transmission period 721, data may be transmitted to the base station through an antenna (first channel: #1) connected to the first PA. In this case, the current supply to the second PA may be cut off.

Then, based on the received data, the base station can transmit a control message including a transmission power parameter for requesting an increase or decrease in the output of the transmission signal to the mobile terminal in the first data reception period 711. In this case, if it is not necessary to increase or decrease the transmission signal output, the control message may not include a transmission power parameter.

Meanwhile, if the transmission power parameter is received in the first data reception period 721, the control unit 350 may change the transmission power of the first PA according to the received transmission power parameter. And when the second data transmission period 722 of the second period 702 arrives, the first PA is deactivated by blocking the current supplied to the first PA, and the second PA is activated by supplying current to the second PA. can do. Then, in the second data transmission period 722, data may be transmitted to the base station through an antenna (second channel: #2) connected to the second PA.

Then, based on the received data, the base station may transmit a control message including a transmission power parameter for requesting an increase or decrease in the output of the transmission signal in the second data reception period 712 to the mobile terminal. In addition, when included in the control message including the transmission output parameter in the second data reception period 722, the controller 350 may change the transmission power of the second PA according to the received transmission output parameter.

Meanwhile, this process may be repeated for each cycle. Therefore, if two PAs are activated by crossing each other, as shown in Fig. 7(a), each time the data transmission period arrives, the transmission signal is amplified by different power amplifiers and data is transmitted through different antennas. Transmission may be transmitted, and transmission output of each power amplifier may be differently controlled based on a transmission output parameter received in response thereto.

Meanwhile, FIG. 7B shows an example in which data is transmitted only through the first channel #1 as only one first PA is activated, as described in step S502 of FIG. 5. In this case, the transmission power parameter received from the base station may be for the first channel. Accordingly, the control unit 350 may increase or decrease the transmission power of the first PA according to the transmission power parameter included in the received control message. In this way, when only the first PA is activated, current supply to the second PA may be cut off, and the temperature of the second PA may be lowered due to heat exchange.

On the other hand, (c) of FIG. 7 shows an example in which data is transmitted only through the second channel #2 as only one second PA is activated, as described in step S508 of FIG. 5. In this case, the transmission power parameter received from the base station may be for the second channel. Accordingly, the control unit 350 may increase or decrease the transmission power of the second PA according to the received transmission power parameter. When only the second PA is activated as described above, current supply to the first PA may be cut off, and accordingly, the temperature of the first PA may be lowered due to heat exchange.

FIG. 8 is a graph showing changes in the amount of heat generated by the PA when data is transmitted in a single transmission method according to an embodiment of the present invention.

Referring to FIG. 8, T1 830 may indicate a temperature measured from a first PA, and T2 840 may indicate a temperature measured from a second PA. And the limit temperature X may mean a preset first temperature.

First, in the case of the section 850 operating with UL MIMO, data is simultaneously output from each antenna, so the two power amplifier temperatures may be similar to each other. In this state, when a data transmission method change is requested through a single transmission method through a control message, the controller 350 may select a first PA and activate only the selected first PA.

When the data transmission method is changed to a single transmission method as described above, since a signal is transmitted from the base station through one antenna, an increase in transmission signal output may be requested. Accordingly, when only the first PA is activated, more current may be supplied to the first PA. Accordingly, as shown in the first PA operation section 800 of FIG. 8, the temperature T1 of the first PA may be continuously increased. On the other hand, since the current supply to the second PA is cut off and deactivated, the temperature T2 of the second PA may gradually decrease.

On the other hand, when T1 reaches a preset limit temperature (X), the control unit 350 deactivates the first PA by blocking the current supplied to the first PA, and activates the second PA by supplying current to the second PA. Yes (2nd PA operation period 810). Accordingly, as shown in the second PA operation period 810 of FIG. 8, the temperature T2 of the second PA gradually increases, and the temperature T1 of the first PA may gradually decrease.

As such, the temperature of the first PA (T1) gradually decreases, and as the temperature of the second PA (T2) gradually increases, the difference between the temperature of the first PA (T1) and the temperature of the second PA (T2) is a preset temperature. When it decreases to less than that, the control unit 350 may cross and activate the first PA and the second PA for a predetermined time (cross operation period 830).

Meanwhile, when the predetermined time elapses, the control unit 350 may repeat the above process by reselecting the first PA and the second PA according to the transmission output of each controlled power amplifier during the cross operation period 830. . That is, the selected first PA may be activated first (the first PA operation period), and the first PA and the second PA may be activated according to the temperature of the first PA (the second PA operation period). In addition, according to the currently selected temperature T1 of the first PA and the temperature T2 of the second PA, the first PA and the second PA may be activated by crossing each other for a predetermined period of time (cross operation period).

Accordingly, according to the present invention, by crossing and activating the power amplifier based on a preset condition, it is possible to prevent the temperature of any one power amplifier from increasing above the preset temperature. In addition, when transmitting data according to a single transmission method, by first activating any one power amplifier based on the transmission power headroom calculated from each power amplifier, the power amplifier corresponding to the channel with a better channel environment is preferentially activated. To be able to. Accordingly, the present invention can reduce current consumption while minimizing heat that may be generated locally in the mobile terminal.

Meanwhile, FIG. 9 is a conceptual diagram illustrating an operation process of controlling a plurality of PAs in a diagram according to an embodiment of the present invention.

Referring to FIG. 9, first, the control unit 350 enables data transmission to be performed with only one power amplifier based on the transmit power headroom of each power amplifier (operation with only PA 1 or operation with only PA 2) (S900 , S902).

And when a preset time (ex: 3 minutes) elapses while data is transmitted with only PA 1 or PA 2, the temperature of the currently used power amplifier (PA 1 temperature: T1, PA 2 temperature: T2) and The power amplifier used for data transmission is changed to another power amplifier based on the transmission power headroom of the power amplifier that is not currently used (S904 and S906).

When the power amplifier used for data transmission is changed to another power amplifier according to steps S904 and S906, the control unit 350 compares the temperature of PA 1 (T1) and the temperature of PA 2 (T2) (S908). , Based on the comparison result, the first PA and the second PA may be crossed and activated (S910).

In addition, when the first PA and the second PA are activated by crossing each other in step S910, the control unit 350 may calculate the transmission power headroom of each power amplifier again after a predetermined time elapses (S900). In addition, data transmission may be performed using only one power amplifier according to the calculation result (S902). In addition, a process from step S904 to step S910 may be repeatedly performed.

Meanwhile, in the above-described embodiment of the present invention, it has been described that the power amplifier of the channel having a better wireless environment is selected as the first PA by calculating the transmission power headroom of each power amplifier, but this is only an embodiment of the present invention. Of course, the present invention is not limited thereto.

For example, a current sensor or a voltage sensor may be used to detect a power amplifier of a channel having a better wireless environment. For example, the sensor unit 320 of each power amplifier may include a current sensor for detecting the amount of current supplied from the power supply unit 330. In this case, the current sensor provided in each power amplifier may measure the amount of current supplied to each power amplifier, and the measured amount of current may be input to the controller 350. Then, the control unit 350 can detect the size of the current power amplifier transmission output from the amount of current supplied to each power amplifier, and determine the wireless environment of the antenna to which the power amplifier is connected from the detected size of the transmission output. have. In this case, the lower the transmission power, that is, the smaller the amount of current flowing into the power amplifier, the better the wireless environment may be determined. Accordingly, a power amplifier having a lower transmit power may be selected as the first PA.

Meanwhile, it goes without saying that the amount of current flowing into the power amplifier may be measured through a voltage sensor instead of a current sensor. In this case, the controller 350 may calculate the amount of current supplied to each power amplifier based on the measured voltage value and the fixed resistance value of each power amplifier. It goes without saying that it is also possible to detect the size of the current power amplifier transmission output from the calculated amount of current, and determine the wireless environment of the antenna to which the power amplifier is connected from the size of the transmission output.

Meanwhile, in the above description, when the data transmission method is changed to a single transmission method while transmitting data according to the UL MIMO method, the transmission power headroom of each power amplifier is calculated, and each power amplifier is alternated according to the calculated result. It has been described as an example of activating or selectively activating one power amplifier, but alternately activating each power amplifier or selectively activating one power amplifier based on the difference in temperature measured from each power amplifier. Of course, it can also be activated with.

That is, when the data transmission method is changed to a single transmission method, if the difference between the temperature of the first power amplifier 210 and the temperature of the second power amplifier 220 is less than a preset temperature, the controller 350 The power amplifier 210 and the second power amplifier 220 may be activated alternately for a predetermined time. In addition, after alternately being activated, the process S500 of FIG. 5 may be performed to calculate the transmit power headroom of each power amplifier. In addition, the rest of the process of FIG. 5 may be performed.

On the other hand, if the difference between the temperature of the first power amplifier 210 and the temperature of the second power amplifier 220 is greater than or equal to a preset temperature, the transmission output of each power amplifier is likely to be different from each other. Proceeding to step S500, the transmission power headroom of each power amplifier may be calculated and the rest of the process of FIG. 5 may be performed.

The present invention described above can be implemented as a computer-readable code in a medium on which a program is recorded. The computer-readable medium includes all types of recording devices storing data that can be read by a computer system. Examples of computer-readable media include HDD (Hard Disk Drive), SSD (Solid State Disk), SDD (Silicon Disk Drive), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. There is also a carrier wave (eg, transmission over the Internet). Also, the computer may include the controller 180 of the terminal. Therefore, the detailed description above should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims

A plurality of antennas including two antennas used for both transmission and reception;

Two power amplifiers (PAs) respectively connected to the two antennas and amplifying and outputting signals to be transmitted from the two antennas according to an input current;

A power supply unit supplying current for driving the two PAs;

A temperature sensing unit for sensing the temperature of each of the two PAs, and

When a control message from a base station requesting data transmission through one antenna is received, a first PA is selected based on the transmission power headroom of each of the two PAs, and current is supplied only to the selected first PA The power supply is controlled so that the current is supplied to the first PA, and the current supplied to the first PA is blocked based on the temperature of the first PA, and a current is supplied to the second PA different from the first PA. And a control unit for controlling the power supply to supply.
The method of claim 1, wherein the control unit,

In a state in which current is supplied to the first PA, if the temperature sensed by the first PA is greater than or equal to the first temperature, whether the second PA is usable is further detected based on the transmission power headroom of the second PA, and ,

When the sensed temperature is greater than or equal to the first temperature, when it is determined that the second PA is usable, the power supply unit is controlled to cut off the current supplied to the first PA and supply current to the second PA,

Whether the second PA is available or not,

The mobile terminal, characterized in that it is determined according to whether the transmission power headroom of the second PA is equal to or greater than a preset value.
The method of claim 2, wherein the control unit,

In a state where current is supplied to the second PA, the temperature difference between the first PA and the second PA is detected, and when the detected temperature difference is less than the second temperature, the two PAs are alternately supplied with current. Mobile terminal, characterized in that for controlling the power supply.
The method of claim 1, wherein the control unit,

In a state in which data is transmitted through both antennas, when the control message is received,

Based on the temperature difference between the two PAs, the power supply unit is controlled to supply current to only one of the PAs or alternately supply current to the two PAs according to the headroom of the transmission power. terminal.
The method of claim 3 or 4, wherein the control unit,

When current is alternately supplied to the two PAs, the power supply unit selects one PA based on the transmission power headroom of each of the two PAs and supplies current only to the selected PA when a preset time elapses. Mobile terminal, characterized in that to control.
The method of claim 3 or 4, wherein the control unit,

When current is alternately supplied to the two PAs, the power supply unit is controlled to supply current to different PAs for each data transmission period of the mobile terminal, which is time division multiplexed according to a Time Division Duplex (TDD) method. Mobile terminal.
The method of claim 1, wherein the first PA,

Mobile terminal, characterized in that among the two PAs, a PA having a large transmission power headroom value.
The method of claim 1, wherein the control message,

When data are simultaneously transmitted from two antennas of the mobile terminal, the mobile terminal is transmitted from the base station to the mobile terminal according to a channel environment determined by the base station based on data received from the mobile terminal. .
The method of claim 1, wherein the control unit,

And calculating a transmission power headroom of each of the two PAs by subtracting a current transmission power value of each PA from each of the maximum transmission power headrooms preset in each PA.
The method of claim 9,

The maximum transmit power headrooms are:

These are the maximum transmit power outputs set in each PA,

The current transmission power value of each PA is,

The mobile terminal, characterized in that the transmission power is controlled by the transmission power parameter included in the request of the base station.
The method of claim 1, wherein the two antennas used for both transmission and reception,

Mobile terminals, characterized in that they are antennas for transmitting or receiving signals of any one of n41 band, n77 band, n78 band, and n79 band according to a 5G NR (New Radio) protocol.
The method of claim 1, wherein the control unit,

A mobile terminal, characterized in that it is a modem (MODEM), an application processor (AP), or a terminal control unit that controls the overall operation of the mobile terminal.
In the control method of a mobile terminal in which a data transmission method is changed to a single transmission method according to a request from a base station,

Calculate transmission power headrooms for power amplifiers (PAs) of a plurality of transmission/reception channels provided for UL MIMO (Up Link Multi Input Multi Output), and select the first PA based on the calculated transmission power headroom The first step;

A second step of supplying current to the selected first PA to activate the first PA, and performing data transmission through the activated first PA;

A third step of measuring the temperature of the first PA and determining whether a second PA different from the first PA can be used;

According to the temperature measurement result of the first PA and the determination result of whether the second PA is usable or not, the first PA is deactivated by blocking the current supplied to the first PA, and a current is supplied to the second PA to obtain a second PA. A fourth step of activating the PA;

A fifth step of performing data transmission through the activated second PA; And,

When the temperature difference between the deactivated first PA and the activated second PA is less than the first temperature, current is alternately supplied to the first PA and the second PA, and data is transmitted through different PAs at a predetermined period of time. And a sixth step of performing a control method for a mobile terminal.
The method of claim 13, wherein the preset time,

A control method for a mobile terminal, characterized in that the time corresponds to a data transmission period of the mobile terminal, which is time division multiplexed according to a Time Division Duplex (TDD) scheme.
The method of claim 14, wherein the sixth step,

A 6-1 step of receiving, from the base station, a control message including transmission power parameters for changing transmission powers of different PAs for each data reception period of the time division multiplexed mobile terminal;

A 6-2 step of respectively controlling the transmission power of the first PA and the second PA according to each of the received transmission power parameters;

A 6-3 step of recalculating the transmission power headrooms of each PA based on the respective controlled transmission powers of the first and second PAs after a predetermined time elapses; And,

And a 6-4 step of reselecting the first PA based on the recalculated transmission power headrooms.
The method of claim 13, wherein the first step,

A step 1-1 of measuring the temperature of the first PA and the second PA and calculating a difference between the measured temperature; And,

Based on the measured temperature difference, the transmission power headrooms of each PA are directly calculated, or current is alternately supplied to the first PA and the second PA, And a 1-2 step of calculating the transmission power headrooms of each PA after performing the transmission.
The method of claim 13, wherein whether the second PA is usable or not,

The control method of a mobile terminal, characterized in that it is determined according to whether the calculated transmission power headroom for the second PA is equal to or greater than a preset value.