KR101783609B1 - The user equipment apparatus for transmitting simultaneously from a plurality of applied different wireless communication scheme and method for controlling transmission power thereof - Google Patents

Abstract

Disclosed is a terminal device capable of simultaneously transmitting signals in a plurality of wireless communication chips to which different wireless communication methods are applied, and a method of controlling transmission power of the terminal device. In the terminal device according to the present invention, the transmission mode determination section determines whether the terminal device operates in a mode in which signals are transmitted from only one wireless communication chip, or a mode in which a plurality of wireless communication chips simultaneously transmit signals to which different wireless communication methods are applied As shown in FIG. The intermodulation distortion effect determining unit may determine the intermodulation distortion (IMD) of a signal transmitted simultaneously from the plurality of wireless communication chips when the plurality of wireless communication chips operate in a mode of simultaneously transmitting signals, Determine whether the combination is affecting.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal apparatus for simultaneously transmitting signals in a plurality of wireless communication chips to which different wireless communication systems are applied and a transmission power control method for the terminal apparatuses controlling transmission power thereof}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to transmission power control of a terminal apparatus, and more particularly, to controlling transmission power of a terminal apparatus for simultaneously transmitting signals in a plurality of wireless communication chips to which different wireless communication systems are applied.

With the remarkable development of wireless communication technology, the use of radio waves has increased in demand, and is widely used not only in the communication and broadcasting fields but also in daily life of medical, traffic and surrounding. As the use of electronic and electric devices has soared, electromagnetic waves radiated from these radio wave utilization facilities and devices have had a great influence on the human body. In particular, for mobile devices, the Federal Communications Commission (FCC) has adopted guidelines for the environmental impact assessment of radio frequency radiation from FCC 96-326 to provide localized power dissipation for any portable transmitters And the limits of the limits. The maximum permissible exposure limits specified here are based on exposure assessment criteria quantified in terms of the Specific Absorption Rate (SAR), a measure of the radio frequency (RF) energy absorption rate. When the human body is irradiated with electromagnetic waves, the quantitative evaluation of electromagnetic waves is performed by SAR measurement by means of power measurement, electromagnetic field analysis, and animal experiment. The SAR is generally expressed by the absorption power per unit mass absorbed by the human body .

In addition to the US FCC, the European Commission for Electrotechnical Standardization (CENELEC) also specifies SAR requirements as a requirement for conformity assessment for mobile terminals. As described above, the FCC of the United States and CENELEC of Europe designate as an important item of the conformity assessment of the mobile communication terminal although there is a difference in the reference value of the Specific Absorption Rate (SAR) condition . Therefore, the mobile communication terminal must satisfy the SAR condition (or regulation).

Generally, in a wireless communication system, a terminal needs to comply with SAR regulations even when signals are simultaneously transmitted through two or more frequency bands. That is, when the terminal simultaneously transmits signals to which different wireless communication systems are applied in a plurality of wireless communication chips, a SAR exceeding problem occurs.

In this case, there arises a problem that interference occurs between signals transmitted at the same time due to intermodulation distortion (IMD) (also referred to as IM3) as well as exceeding the SAR standard, resulting in a significant decrease in communication performance.

However, a specific method for solving the above-mentioned SAR exceeding and IMD problems has not yet been disclosed.

SUMMARY OF THE INVENTION The present invention provides a terminal device capable of simultaneously transmitting signals from a plurality of wireless communication chips to which different wireless communication methods are applied.

According to another aspect of the present invention, there is provided a method of controlling transmission power of a terminal device capable of simultaneously transmitting signals in a plurality of wireless communication chips to which different wireless communication methods are applied.

The technical problems to be solved by the present invention are not limited to the technical problems and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a terminal device for performing a signal transmission in only one wireless communication chip or a plurality of wireless communication chips, A transmission mode determining unit for determining whether the mobile station is operating in a mode in which the mobile station is operating; And determining whether or not a frequency of a signal to be simultaneously transmitted by the plurality of wireless communication chips is a combination that affects Intermodulation Distortion (IMD), when operating in a mode of simultaneously transmitting signals in the plurality of wireless communication chips And an intermodulation distortion effect determining unit for determining the intermodulation distortion.

Preferably, when the frequency is a combination that affects intermodulation distortion, the terminal device may be configured to transmit a signal having a predetermined priority to a transmission power of a signal to be transmitted from the wireless communication chip having the lowest priority among the plurality of wireless communication chips And a first transmission power control unit for performing power back-off.

Preferably, the terminal apparatus may further include a sensing unit for determining whether the terminal apparatus is close to a predetermined distance or less near a user's ear. The sensing unit may be configured to detect whether any one of a hands-free function, a speaker phone, a Bluetooth sound device, and an earphone is currently used in the terminal device, or based on measured distance information between the terminal device and the user, It is possible to determine whether or not the distance is close to a predetermined distance or less.

Preferably, the terminal apparatus further comprises a transmission power controller for controlling the transmission power of each of the plurality of wireless communication chips determined based on the power back-off by the first transmission power controller, And a SAR condition satisfaction determination unit that determines whether or not the SAR condition is satisfied.

Preferably, when the SAR condition is not satisfied, a power back-up operation is performed so as to satisfy the predefined SAR condition for a transmission power value of a signal to be transmitted in the wireless communication chip having the lowest priority among the plurality of wireless communication chips. And a second transmission power control unit for performing a back off operation.

Preferably, the transmission power control unit may further include a transmission unit that simultaneously transmits signals of the plurality of wireless communication chips based on a power value determined according to power back-off by the first transmission power control unit when the SAR condition is satisfied have.

Alternatively, the terminal apparatus may further include a transmitter that simultaneously transmits the signals of the plurality of wireless communication chips based on the power value determined according to the power back-off performance of the second transmission power controller.

According to another aspect of the present invention, there is provided a method of controlling a transmission power of a terminal according to the present invention. The method comprises the steps of: determining whether a terminal device operates in a mode for transmitting signals in only one wireless communication chip, A transmission mode decision step of deciding whether or not the mobile station is operating in a mode for simultaneously transmitting signals to which a communication scheme is applied; And if the determined transmission mode is a mode in which signals are simultaneously transmitted from a plurality of wireless communication chips, whether a frequency of a signal transmitted simultaneously by the plurality of wireless communication chips is a combination that affects Intermodulation Distortion (IMD) And determining an intermodulation distortion effect determining step.

Preferably, if the frequency is a combination giving an intermodulation distortion effect, the method may further comprise the steps of: determining a transmission power of a signal to be transmitted from the wireless communication chip having the lowest priority among the plurality of wireless communication chips, - a first transmission power control step of performing a back off operation.

Advantageously, the method may further comprise a sensing step of determining whether the terminal is close to or below a predetermined distance in the vicinity of the user's ear. The sensing step may be a sensing step of determining whether any one of a hands-free function, a speaker phone, a Bluetooth sound device and an earphone is currently used in the terminal device, or based on the measured distance information between the terminal device and the user, It is possible to determine whether or not the distance is close to a predetermined distance or less near the ear.

Preferably, the method further comprises: when the transmission power values of the signals transmitted at the respective concurrently transmitted signals in the plurality of wireless communication chips after performing the power back-off in the first transmission power control step are lower than the predetermined absorption rate Rate, SAR) condition is satisfied, the SAR condition satisfying condition may be further included.

Preferably, the method further comprises: when the SAR condition is not satisfied, satisfying the predefined SAR condition for the transmission power value of a signal to be transmitted in the wireless communication chip having the lowest priority among the plurality of wireless communication chips And a second transmission power control step of performing a back-off operation to perform a back-off operation.

Preferably, the method further comprises the step of simultaneously transmitting the signals of the plurality of wireless communication chips based on the power value determined according to the power back-off performance of the first transmission power controller when the SAR condition is satisfied .

Alternatively, the method may further comprise simultaneously transmitting signals of the plurality of wireless communication chips based on the power value determined according to the power back-off performance in the second transmission power control step.

According to the transmission power control method of the terminal and the terminal according to the present invention, the influence of the IMD which may occur when signals are simultaneously transmitted from a plurality of wireless communication chips to which different wireless communication systems are applied is eliminated and the SAR condition is satisfied The communication performance can be remarkably improved.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a diagram showing an example of a configuration of a terminal 100 according to the present invention,
2 is a diagram illustrating an example of a configuration of a terminal 100 that performs transmission power control according to the present invention,
FIG. 3 is a flowchart illustrating a preferred procedure of a method for controlling transmission power of a terminal 100 according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention. In the following description, the same components are denoted by the same reference numerals throughout the specification.

In addition, in the description of the present invention, a terminal may be a moving or fixed type mobile station such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), a mobile handset, All of the communication devices used by the user of the mobile communication terminal. It is also assumed that the base station collectively refers to any node at a network end that communicates with a terminal such as a Node B, an eNode B, a BS (Base Station), and an AP (Access Point).

The term "wireless communication system" in the present invention may be referred to as various forms such as a radio access technology (RAT) system. Examples of the wireless communication system or the wireless access technology system include a Code Division Multiple Access (CDMA), a Wideband Code Division Multiple Access (WCDMA), and a Long Term Evolution (LTE).

In a wireless communication system, a terminal can receive a signal through a downlink from a base station, and the terminal can also transmit a signal through an uplink. The information transmitted or received by the terminal includes data and various control information, and various physical channels exist depending on the type of information transmitted or received by the terminal.

In this specification, the first wireless communication chip and the second wireless communication chip are chips for transmitting signals by applying different wireless communication systems or wireless connection technology systems. Hereinafter, as an example, the first wireless communication chip may be a chip for transmitting a signal using the CDMA scheme, and the second wireless communication chip may be a chip for transmitting a signal using the LTE scheme. However, it is not limited to these examples.

1 is a diagram showing an example of a configuration of a terminal 100 according to the present invention.

1, a terminal 100 includes a first wireless communication chip 110, a second wireless communication chip 120, a power amplifier 130, an RF front-end module 140 And an antenna 150. [0028]

The first and second wireless communication chips 110 and 120 modulate the original signal (baseband signal) into a signal of a high frequency band during a signal transmission process, Performs a function of demodulating the received high frequency signal into a baseband signal. Each of the wireless communication chips 110 and 120 may be implemented as a " RF (Radio Frequency) chip " for modulating a signal processed in the baseband into a signal in a high frequency band, and a baseband chip for processing a baseband signal, RF < / RTI > baseband chip "which is an RF chip that modulates a signal processed in the baseband into a high frequency band or demodulates the received signal into a low frequency band and processes the signal as a baseband signal.

Also, the first and second wireless communication chips 110 and 120 may be implemented as separate chips as shown in FIG. 1, or may be implemented as a single chip.

As described above, the first wireless communication chip 110 and the second wireless communication chip 120 process the original signal into a signal of a high frequency band during a signal transmission process, and conversely, Band signal and perform modulation / demodulation functions, respectively.

When the terminal 100 needs to simultaneously transmit signals to a plurality of wireless communication chips 110 and 120 to which different wireless communication systems are applied, the first wireless communication chip 110 transmits the original signal to the first frequency band And at the same time, the second wireless communication chip 120 can perform a function of processing the original signal into a signal of the second frequency band. That is, the terminal 100 can transmit signals by modulating signals in different frequency bands in the first and second wireless communication chips 110 and 120 during signal transmission. Generally, when the terminal 100 simultaneously transmits signals processed by the first and second wireless communication chips 110 and 120, the terminal 100 can transmit signals through different frequency bands.

An interface (not shown) is connected between the first wireless communication chip 110 and the second wireless communication chip 120 to exchange signals and information between the components within the terminal 100.

A power amplifier (PA) 130 plays a role of amplifying a received signal processed by the first wireless communication chip 110 and the second wireless communication chip 120 (in particular, processed into different frequency bands) .

The RF front-end module 140 can perform transmission and reception of the terminal 100 and enable communication in various environments. The RF front-end module 140 connects the antenna 150 in the terminal 100 with the first wireless communication chip 110 and the second wireless communication chip 120 to separate the transmission and reception signals . The RF front-end module 140 includes a receiving end front-end module having a receiving signal filtering filter as a module for filtering and amplifying and a power amplifier 130 for amplifying a transmitting signal A transmitter front-end module, and the like. This RF front-end module 140 is mainly used in a Global System for Mobile communications (GSM) terminal of a time division (TDMA) type in which a transmission signal and a reception signal must be switched during a call .

In addition, the RF front-end module 140 can be used to transmit signals over multiple frequency bands, such as the terminal 100 described in the present invention. For example, the RF front-end module 140 allows the terminal 100 to use the GSM method and the W-CDMA method at the same time. By using the RF front-end module 140, it is possible to reduce the number of components of the terminal 100 and improve the reliability of the terminal 100, The loss can be reduced.

The RF front-end module 140 reduces power consumption, dramatically improves battery consumption, and enables miniaturization of components of multiple frequency bands and multi-function terminals. 1, the RF front-end module 140 may transmit signals processed in a plurality of frequency bands received from the power amplifier 130 through the antenna 150, respectively .

The antenna 150 transmits a signal to an external device (e.g., a base station) and is shown as one in FIG. 1. However, the terminal 100 may have a plurality of antennas.

Hereinafter, the detailed configuration of the terminal 100 for controlling the power of the signal when the first wireless communication chip 110 and the second wireless communication chip 120 simultaneously transmit signals to which different wireless communication systems are applied, Explain.

2 is a diagram illustrating an example of a configuration of a terminal 100 that performs transmission power control according to the present invention.

2, the AT 100 includes a transmission mode determination unit 210, an intermodulation distortion effect determination unit 220, a first transmission power control unit 230, a sensing unit 240, a SAR condition determination unit 250 ), A second transmission power control unit 260, and a transmission unit 270.

The transmission mode determination unit 210 determines whether the terminal 100 is operating in a mode in which signals are transmitted from only one wireless communication chip (for example, the first wireless communication chip 110) It is determined whether the chip (for example, the first and second wireless communication chips 110 and 120) is operating in a mode for simultaneously transmitting signals to which different wireless communication methods are applied.

The intermodulation distortion effect determining unit 220 determines that the transmission mode determining unit 210 is operating in a mode in which signals are simultaneously transmitted from the plurality of wireless communication chips 110 and 120, And determines whether the frequency of the transmitted signal is a combination that affects InterModulation Distortion (IMD).

Intermodulation Distortion (IMD) is a phenomenon in which two or more frequencies pass through a nonlinear system or circuit, resulting in a signal that has not been input to the output. The IMD is a distortion caused by such IM . These IMDs are important because digital systems such as CDMA do not use one frequency, that is, one channel, unlike an analog system, where multiple signals share wide channel bandwidth. That is, since signals of various frequencies are simultaneously input to a system for processing one band, if signals of various frequencies are mixed with each other at the output terminal, signal processing may not be performed properly.

For example, if there are two frequencies f1 and f2, the output contains mixed signals, but the complete drainage harmonies such as 2 * f1, 3 * f2 can be filtered. However, the problem is the third order, 2 * f1 * f2 and 2 * f2 * f1, which is problematic because the signals f1 and f2 are very close together. The IMD mainly refers to this third-order intermodulation component, so signals usually referred to as IMDs often refer to 3rd order IMDs. Typically, the IM, also referred to as the IMD, is also called IM3 alone because the third frequency component is the primary object of removal.

In particular, as the input signal increases, the 3rd order IMD increases as the input signal increases. As the input signal increases, the IMD increases at a much faster rate than the original signal, Occurs. The point at which IMD is similar to the original signal power is called IP3.

As such, IMD means the degree of distortion of the signal due to intermodulation, and IP3 is used as the actual product specification or measurement reference value. In the superheterodyne scheme, which uses an intermediate frequency (IF), it is important to eliminate the 3rd IM because the intermodulation is the closest to the original signal. It is therefore desirable to reduce the effects of such signal distortion and interference, such as IMD.

If the intermodulation distortion effect determining unit 220 determines that the frequency of a signal transmitted simultaneously by the plurality of wireless communication chips 110 and 120 is a combination that affects Intermodulation Distortion (IMD), the first transmission power The controller 230 controls the power back-off by a preset value for the transmission power of the signal to be transmitted from the wireless communication chip having the lowest priority (or the lowest priority) among the plurality of wireless communication chips 110 and 120 Can be performed.

In this case, the first transmission power control unit 230 performs power back-off with respect to the power of the signal transmitted from the low-priority wireless communication chip and controls to transmit the signal with the back-off power value. On the other hand, the power value of the signal transmitted from the wireless communication chip having a high priority can be maintained as it is.

For example, assuming that the second wireless communication chip 120 to which data is applied using the LTE wireless communication standard scheme is a wireless communication chip with a lower priority, the first transmission power control unit 230 controls the second wireless communication chip 120 may perform power back-off by a preset value with respect to the transmission power of a signal to be transmitted. The amount by which the first transmission power controller 230 backs off the power of the signal to be transmitted from the low-priority wireless communication chip due to the influence of the IMD (or IM3) depends on the predetermined IMD table Can be set.

The sensing unit 240 determines whether the terminal device 100 is close to a predetermined distance or less near the user's ear to grasp the SAR effect. At this time, the sensing unit 240 determines whether a hands-free function is currently activated in the terminal 100, whether the speaker phone, the Bluetooth sound device, the earphone or the like is currently used in the terminal, It is determined whether the user 100 is close to a predetermined distance or less near the user's ear.

If the handsfree function is not activated or the speaker phone, the Bluetooth sound device and the earphone are not currently used in the terminal, the sensing unit 240 senses that the terminal device 100 is in the user's ear It can be determined that the distance is less than a preset distance. Alternatively, the sensing unit 240 may determine whether the terminal 100 approaches a predetermined distance or less near the user's ear based on the measured distance information between the terminal 100 and the user through proximity sensing. Here, the predetermined distance may be a threshold that satisfies the SAR specification.

If the sensing unit 240 determines that the terminal 100 is close to or below a predetermined distance in the vicinity of the user's ear, the SAR condition determination unit 250 determines that the power is back-off in the first transmission power control unit 230 it is possible to determine whether or not the transmission power values of the signals simultaneously transmitted by the plurality of wireless communication chips 110 and 120 after performing the off-state satisfy predetermined Specific Absorption Rate (SAR) conditions.

When the SAR condition determining unit 250 determines that the transmission power values of the signals simultaneously transmitted from the plurality of radio communication chips 110 and 120 after performing the power back-off in the first transmission power control unit 230, The second transmission power controller 260 determines that the wireless communication chips 110 and 120 have the lowest priority (or the lowest priority) among the plurality of wireless communication chips 110 and 120, A power back off may be performed to satisfy the SAR condition on the transmission power value of the signal to be transmitted from the communication chip (for example, the second wireless communication chip 120).

In this case, the second transmission power controller 260 may control the power of the signal transmitted from the low-priority wireless communication chip to perform power back-off and transmit the signal with the back-off power value. On the other hand, the power value of the signal transmitted from the wireless communication chip having a high priority (that is, the power value determined after performing the power back-off in the first transmission power control section 230 due to the influence of the IMD) .

Table 1 below is a table showing an example of the transmission power value of a signal in the second wireless communication chip 120 having a lower priority according to the transmission power value of the first wireless communication chip 110 so as to satisfy the SAR condition.

Example of the transmission power value of the first wireless communication chip (dBm) Example of the transmission power value of the second wireless communication chip (dBm) A power back-off value (dBm) for a signal to be transmitted in the second wireless communication chip, 23 18 5 22 19 4 21 20 3 20 21 2 19 22 One 18 23 0

As shown in Table 1, the transmission power values of the transmission signals in the first and second wireless communication chips 110 and 120 that satisfy the SAR condition can be set in advance. For example, as shown in Table 1, when the first transmission power of the first wireless communication chip 110 is 23 dBm, the second transmission power control unit 260 controls the transmission power of the second wireless communication chip 120, Off power to the transmission power value of the second signal to be transmitted from the base station and determine 18 dBm as the power value of the signal to be transmitted. That is, in this case, the second transmission power controller 260 performs 5 dBm backoff at 23 dBm, which is the maximum transmission power value, and determines 18 dBm as the power value of the signal to be transmitted. That is, the amount of power back-off is 5 dBm.

The first wireless communication chip 110 transmits a signal by applying the CDMA method when the signals are simultaneously transmitted from the first wireless communication chip 110 and the second wireless communication chip 120, Assuming that the chip 120 transmits a signal by applying the LTE scheme, the first wireless communication chip 110 mainly transmits a voice signal and the second wireless communication chip 120 mainly transmits a data signal. When the terminal 100 simultaneously transmits voice and data signals, the second transmission power control unit 260 controls the transmission power of the first wireless communication chip 110 may determine a transmission power value of a signal to be simultaneously transmitted by the second wireless communication chip 120 according to the power value of the first signal to be transmitted.

The second transmission power control unit 260 determines the value to be subjected to power back-off with respect to the power of the signal to be transmitted from the wireless communication chip having a lower priority (for example, the second wireless communication chip 120) And determine a transmission power value according to the determined transmission power value.

When the SAR condition determining unit 250 determines that the transmission power values of the signals transmitted simultaneously by the plurality of wireless communication chips 110 and 120 after the power back-off of the first transmission power control unit 230 are concurrently set to the predetermined SAR condition The transmission unit 270 can simultaneously transmit the signals of the plurality of wireless communication chips 110 and 120 based on the power value determined according to the power back-off performance of the first transmission power control unit 230 have.

The second transmission power control section 260 determines the transmission power value of a signal to be transmitted from a wireless communication chip having a lower priority (for example, the second wireless communication chip 120) among the plurality of wireless communication chips 110 and 120 When the power back-off is performed so that the SAR condition is satisfied, the transmitting unit 270 transmits the power control value to the plurality of wireless communication chips 260 based on the power value determined according to the power back- (110, 120) can be transmitted simultaneously.

Alternatively, the second transmission power control unit 260 may adjust the maximum transmission power value of all of the plurality of wireless communication chips 110 and 120 in consideration of the current transmission power situation between the plurality of wireless communication chips 110 and 120 .

FIG. 3 is a flowchart illustrating a preferred procedure of a method for controlling transmission power of a terminal 100 according to the present invention.

3, the transmission mode determining unit 210 determines whether the terminal 100 is operating in a mode in which signals are transmitted from only one wireless communication chip (for example, the first wireless communication chip 110) , Or whether a plurality of wireless communication chips (for example, the first and second wireless communication chips 110 and 120) are operating in a mode for simultaneously transmitting signals to which different wireless communication systems are applied ( S305).

If the intermodulation distortion effect determining unit 220 determines that the transmission mode determining unit 210 operates in a mode in which signals are simultaneously transmitted from the plurality of wireless communication chips 110 and 120, It is determined whether the frequencies of the signals transmitted at the same time are combinations that affect InterModulation Distortion (IMD) (S310).

If the intermodulation distortion effect determining unit 220 determines that the frequencies of the signals transmitted from the plurality of wireless communication chips at the same time are combinations that affect Intermodulation Distortion (IMD) (S310), the first transmission power control unit 230 performs power back-off by a preset value in the transmission power value of a signal to be transmitted from the wireless communication chip having the lowest priority (or low priority) among the plurality of wireless communication chips (S320). At this time, the first transmission power controller 230 determines a power level for power back-off according to a predetermined IMD (or IM3) table, The power back-off may be performed on the signal to be transmitted from the chip (S315). That is, the first transmission power controller 230 determines the power value by applying power back-off to the power of the signal transmitted from the low-priority wireless communication chip.

The sensing unit 240 determines whether the terminal device 100 is close to a predetermined distance or less near the user's ear to grasp the SAR effect. At this time, the sensing unit 240 senses whether or not the terminal device 100 has activated the hands-free function, whether the speaker phone, the Bluetooth sound device, the earphone or the like is currently used in the terminal device, 100 in the vicinity of the user's ear (S320).

If the handsfree function is not activated or the speaker phone, the Bluetooth sound device and the earphone are not currently used in the terminal, the sensing unit 240 senses that the terminal 100 is located near the user's ear It is determined that the distance is less than a preset distance (S320). Alternatively, the sensing unit 240 may determine whether the terminal 100 is close to a predetermined distance or less near the user's ear based on the measured distance information between the terminal 100 and the user through proximity sensing S325). Here, the predetermined distance may be a threshold that satisfies the SAR specification.

When the sensing unit 240 determines that the terminal 100 has not come close to the ear or less near the predetermined distance in steps S320 and S325, the transmitting unit 270 determines in advance (Or low) wireless communication chip according to the IMD (or IM3) table, the signals of the plurality of wireless communication chips are simultaneously transmitted using the power value after applying the power back-off to the signal to be transmitted from the wireless communication chip having the lowest priority (S340).

Alternatively, when the sensing unit 240 determines that the terminal 100 is close to a predetermined distance or less near the user's ear (S325), the SAR condition determination unit 250 determines that the SAR of the first transmission power control unit 230 It is determined whether or not the transmission power values of the signals simultaneously transmitted by the plurality of wireless communication chips 110 and 120 after performing the power back-off satisfy the predetermined Specific Absorption Rate (SAR) condition (S335).

When the SAR condition determining unit 250 determines that the transmission power values of the signals transmitted simultaneously by the plurality of wireless communication chips 110 and 120 after the first transmission power control unit 230 performs the power back- The second transmission power controller 260 determines that the wireless communication chip having the lowest priority among the plurality of wireless communication chips 110 and 120 (for example, For example, a power back-off may be performed to satisfy a SAR condition with respect to a transmission power value of a signal to be transmitted in step S345.

However, if the SAR condition determining unit 250 determines that the SAR condition is satisfied (S335), the transmitting unit 270 sets the priority (priority) according to the IMD (or IM3) table previously determined by the 1 transmission power control unit 230 The signals of the plurality of wireless communication chips can be transmitted simultaneously using the power value after applying the power back-off to the signal to be transmitted in the lowest wireless communication chip at step S350.

Thereafter, the terminal 100 performs calculation on the power margin that can be transmitted, and when the power headroom (PH) is triggered, the terminal 100 can transmit the power headroom report to the base station. As an example of adjusting the maximum transmission power, a method of performing instantaneous transmission power limitation and consequently power headroom reporting can be used.

In the case where the power headroom is triggered, a brief description will be made with reference to 3GPP LTE and LTE-A, which are one example of a wireless communication standard system.

In general, the terminal may trigger (or generate) a power headroom report (PHR) upon the occurrence of an event such as:

(1) When the timer prohibitPHR-Timer for prohibiting the power headroom report (PHR) is stopped and the change of the transmission pathloss using the terminal is larger than the predetermined value DL_PathlossChange; And

(2) Periodic Report Timer When PeriodicPHR-Timer expires, this situation is called Periodic Power Headroom Report (Periodic PHR). After generating the power headroom report, if the UE has newly transmitted uplink transmission resources distributed by the base station in the current transmission time interval, it is determined from the power headroom value acquired in the physical layer that the corresponding power headroom report control element And restarts the timer prohibitPHR-Timer.

In addition, if it is a periodic power boundary headroom report, restart the periodic report timer PeriodicPHR-Timer. For detailed operation of the power headroom reporting process, reference is made to relevant technical standards (3GPP TS 36.321, 36.213, 36.133).

Up to now, the case where the terminal 100 simultaneously transmits signals in two different wireless communication chips has been mainly described. However, if the terminal is composed of one wireless communication chip, power back-off is performed like a terminal simultaneously transmitting signals in two different wireless communication chips, but selection of a wireless communication chip (or RAT) It does not need it, and therefore it is performed for the corresponding wireless communication chip (or the corresponding RAT).

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) Field Programmable Gate Arrays), a processor, a controller, a microcontroller, a microprocessor, or the like.

In the case of an implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like which performs the functions or operations described above. The software code can be stored in a memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (16)

It is determined whether the terminal device operates in a mode in which signals are transmitted from only one wireless communication chip or in a mode in which a plurality of wireless communication chips simultaneously transmit signals to which different wireless communication methods are applied, ;
When operating in a mode of simultaneously transmitting signals in the plurality of wireless communication chips, it is determined whether or not the frequency of signals transmitted simultaneously by the plurality of wireless communication chips is a combination that affects InterModulation Distortion (IMD) An intermodulation distortion effect determining unit;
When the frequency is a combination giving an intermodulation distortion effect, a power back-off is performed by a preset value for the transmission power of a signal to be transmitted from the wireless communication chip having the lowest priority among the plurality of wireless communication chips A first transmission power control unit performing the first transmission power control;
The transmission power values of signals transmitted at the same time in each of the plurality of wireless communication chips determined based on the power back-off by the first transmission power control unit satisfy a predetermined Specific Absorption Rate (SAR) condition A SAR condition satisfaction determination unit for determining whether the SAR condition is satisfied; And
Wherein when the SAR condition is not satisfied, a power back-off is performed so as to satisfy the pre-defined SAR condition for a transmission power value of a signal to be transmitted from a wireless communication chip having the lowest priority among the plurality of wireless communication chips And a second transmission power controller for performing the second transmission power control. delete delete delete delete delete The method according to claim 1,
And a transmitter for simultaneously transmitting signals of the plurality of wireless communication chips based on a power value determined according to power back-off by the first transmission power controller when the SAR condition is satisfied. Device. The method according to claim 1,
Further comprising a transmission unit for simultaneously transmitting signals of the plurality of wireless communication chips based on a power value determined according to power back-off performance of the second transmission power control unit. Determining whether the terminal device is operating in a mode of transmitting signals only in one wireless communication chip or in a mode in which a plurality of wireless communication chips are simultaneously transmitting signals to which different wireless communication methods are applied;
Wherein if the determined transmission mode is a mode in which signals are simultaneously transmitted from a plurality of wireless communication chips, whether or not the frequency of signals transmitted simultaneously by the plurality of wireless communication chips is a combination that affects intermodulation distortion (IMD) ;
If the frequency is a combination giving an intermodulation distortion effect, a power back-off is performed by a preset value for the transmission power of a signal to be transmitted from the wireless communication chip having the lowest priority among the plurality of wireless communication chips ;
Determining whether transmission power values of signals simultaneously transmitted from the plurality of wireless communication chips after performing the power back-off satisfy a predefined Specific Absorption Rate (SAR) condition; And
Off request is made so as to satisfy the predefined SAR condition with respect to a transmission power value of a signal to be transmitted from a wireless communication chip having the lowest priority among the plurality of wireless communication chips when the SAR condition is not satisfied, And transmitting the transmission power control command to the terminal apparatus. delete delete delete delete delete delete delete

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