KR101788050B1 - Apparatus and method for controlling transmission power of user equipment - Google Patents

Abstract

Disclosed is a terminal apparatus for simultaneously transmitting signals in a plurality of wireless communication chips and a transmission power control method for the terminal apparatus. In the terminal apparatus according to the present invention, the reception module receives the transmission power value of the first signal transmitted from the first wireless communication chip by applying the first wireless communication scheme. The transmission power control module controls the transmission power value of the second signal to be transmitted by the second wireless communication chip to be transmitted based on the transmission power value of the received first signal. The control of the transmission power value of the second signal may include a power back-off control for the transmission power value of the second signal when the transmission power value of the received first signal varies from a previous transmission power value, Wherein the power back-off or the power recovery is performed at a time point when a variation time point of the transmission power value of the first signal or a changed transmission power value is received, Off time value or a power recovery time value.

Description

[0001] Apparatus and method for controlling transmission power of a terminal and a terminal [0002]

The present invention relates to a method of controlling transmission power of a terminal and a terminal.

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 such, the FCC in the US and CENELEC in Europe have designated SAR as an important item in the conformity assessment of mobile terminals, although there is a difference in the reference value. Therefore, the mobile communication terminal must satisfy the SAR condition (or regulation).

Generally, in a wireless communication system, a terminal needs to comply with a Specific Absorption Rate (SAR) code even when two or more different wireless communication systems are simultaneously transmitting signals. have. The transmission power of the first wireless communication chip is measured and used to prevent the case where the first and second wireless communication chips are simultaneously transmitting signals at the maximum power and exceed the SAR standard. There arises a problem that fluctuation of the transmission power of the second wireless communication chip occurs severely when used in the second wireless communication chip.

However, methods and studies for improving these problems have yet to be presented.

According to an aspect of the present invention, there is provided a terminal device capable of simultaneously transmitting signals 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 simultaneously transmitting signals 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 another aspect of the present invention, there is provided a method of controlling a transmission power of a signal including a plurality of wireless communication chips, the method comprising: receiving a transmission power value of a first signal transmitted from a first wireless communication chip; And controlling a transmission power value of a second signal to be transmitted by the second wireless communication chip based on a transmission power value of the first signal, wherein the transmission power value control of the second signal comprises: Off or power recovered manner with respect to the transmit power value of the second signal if the transmit power value fluctuates from the previous transmit power value and the power back- Recovery may be performed based on a time point at which the transmission power value of the first signal is changed or a time point at which the changed transmission power value is received, and a power back-off time value or a power recovery time value set in advance.

The method may further comprise simultaneously transmitting the first signal at the received transmit power value with the transmit power value after the power back-off or power recovery is applied.

Here, the power back-off time value or the power recovery time value may be a different value, and the power recovery time value may be larger than the power back-off time value. Also, the first signal may be a voice signal, and the second signal may be a data signal. The first and second signals may be transmitted using different wireless communication schemes.

The power back-off may comprise controlling a transmission power value of the second signal to a predetermined power back-off time from a point of time when the transmission power value of the first signal changes, Can be performed within a time point at which the value elapses.

In addition, in the step of controlling the transmission power value of the second signal, the power recovery may be performed at a time point at which the transmission power value of the first signal changes, or at a point of time when the changed transmission power value is received, Can be performed at a later point in time.

According to an aspect of the present invention, there is provided a terminal device for simultaneously transmitting signals in a plurality of wireless communication chips, the terminal device receiving a transmission power value of a first signal transmitted from a first wireless communication chip, Receiving module; And a transmission power control module for controlling a transmission power value of a second signal to be transmitted by a second wireless communication chip to be transmitted based on a transmission power value of the received first signal, Wherein the first signal is performed in a power back-off or power recovery manner with respect to a transmission power value of the second signal when the transmission power value of the first signal varies from a previous transmission power value, The power back-off or the power recovery is performed based on a point of time when the transmission power value of the first signal is changed or a changed transmission power value is received and a power back-off time value or a power recovery time value set in advance .

Wherein the terminal device comprises: a transmission power measurement module that measures a transmission power value of a first signal transmitted from the first wireless communication chip; And a transmission module for transmitting the measured transmission power value of the first signal.

Further comprising an RF (Radio Frequency) module for simultaneously transmitting the first signal with the received transmission power value and the second signal with a transmission power value after the power back-off or the power recovery is applied, .

The transmission power control module may perform the power back-off within a time point at which a power back-off time value set in advance from a point of time at which the transmission power value of the first signal is changed or a changed transmission power value is received .

In addition, the transmission power control module may perform the power recovery at a point in time when the transmission power value of the first signal fluctuates or a point after the changed transmission power value has elapsed by a preset power recovery time value .

According to the present invention, when a signal to which a wireless communication scheme is applied is simultaneously transmitted, it is possible to transmit an efficient signal satisfying a SAR condition.

Specifically, according to the present invention, even when the transmission power varies in one wireless communication chip, the transmission power of the other wireless communication chip can be mitigated significantly.

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.
3 is a diagram illustrating an example for describing power back-off or power recovery timing in the second wireless communication chip 120 in accordance with a variation in transmission power value of a signal transmitted from the first wireless communication chip 110,
4 is a diagram showing another example for explaining power back-off or power recovery timing in the second wireless communication chip 120 in accordance with a variation of a transmission power value of a signal transmitted from the first wireless communication chip 110;
5 is a diagram illustrating another example for explaining power back-off or power recovery timing in the second wireless communication chip 120 in accordance with a variation in transmission power value of a signal transmitted from the first wireless communication chip 110 , And,
6 is a flowchart illustrating a preferable procedure of a transmission power control method in the case where a terminal simultaneously transmits signals in a plurality of wireless communication chips.

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 includes a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), a mobile handset, mobile terminal, etc.), which are used by mobile or fixed users. 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 a terminal can 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, it is assumed that 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. For example, the first wireless communication chip may be a chip to which the CDMA scheme is applied and the second wireless communication chip may be a chip to which the LTE scheme is applied, but the present invention is not limited thereto.

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] Although not shown,

The first wireless communication chip 110 and the second wireless communication chip 120 transmit an original signal (a baseband signal) in a signal transmission process to a signal in a high frequency band And demodulates the received high frequency signal into a baseband signal in a signal reception process. 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 "in which a signal processed in the baseband is modulated in a high frequency band or an RF chip in which a received signal is demodulated into a low frequency band and processed 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 from 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 in the first frequency band And at the same time, the second wireless communication chip 120 can perform a function of processing an original signal into a signal of a 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. The RF front-end module 140 is used for a Global System for Mobile communications (GSM) terminal of a Time Division Multiplexing (TDMA) scheme in which a transmission signal and a reception signal must be switched during a call. Is used.

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. An RF (Radio Frequency) module may include an RF front-end module 140 and an antenna 150 as a module for transmitting and receiving signals to and from a base station.

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.

Referring to FIG. 2, a terminal according to the present invention includes a first wireless communication chip 110 and a second wireless communication chip 120. Meanwhile, the first wireless communication chip 110 may include a transmission power measurement module 111 and a transmission / reception module 112. The second wireless communication chip 120 may include a transmission power control module 121 and a transmission / reception module 122. The transmission / reception modules 112 and 122 may include a transmission module and a reception module, respectively.

An interface for connecting the modules 111 and 112 may be provided in the first wireless communication chip 110 and an interface for connecting the modules 121 and 122 may be provided in the second wireless communication chip 120. [ Lt; / RTI >

The transmission power measurement module 111 measures a power value of a signal transmitted from the first wireless communication chip 110. 2, the transmission power measurement module 111 is not necessarily provided in the first wireless communication chip 110 but may be provided outside the first wireless communication chip 110 As shown in FIG. Hereinafter, the transmission power measurement module 111 is provided in the first wireless communication chip 110 as a reference.

The transmission / reception module 112 is a module for transmitting data, signals, information and the like of the first wireless communication chip 110 to the outside or receiving data, signals, information and the like from the outside. The transmission and reception module 112 can transmit the transmission power value of the signal transmitted from the first wireless communication chip 110 measured by the transmission power measurement module 111 to the second wireless communication chip 120. [

The transmission and reception module 122 of the second wireless communication chip 120 receives and processes data, signals and information from the outside such as the first wireless communication chip 110 and processes the data, , Information and the like can be transmitted to the outside. The transmission and reception module 122 can receive the power value of the signal transmitted from the first wireless communication chip 110 measured by the transmission power measurement module 111 from the transmission and reception module 112 of the first wireless communication chip 110 have.

The transmission power control module 121 performs transmission power control based on the transmission power value of the first wireless communication chip 110 received by the transmission / reception module 122. The transmission power control method of the transmission power control module 121 will be described by way of example.

Table 1 below is a table showing an example of possible transmission power values (in dBm) when signals are simultaneously transmitted from a plurality of wireless communication chips 110 and 120 to which different wireless communication systems are applied.

The first wireless communication chip The second wireless communication chip Maximum Transmit Power Value (dBm) 24 23 Example of Transmit Power Value (dBm) 23 22 22 21 21 20 20 19 19 18

Referring to Table 1, the maximum transmission power value may be set in advance. For example, the maximum transmission power value of a signal transmitted from the first wireless communication chip 110 is 24 dBm, The maximum transmission power value of the signal transmitted from the base station 110 may be 23 dBm. As described above, the plurality of wireless communication chips 110 and 120 to which different wireless communication systems are applied can transmit signals with power values of 24 dBm and 23 dBm, respectively.

However, if a plurality of wireless communication chips 110 and 120 simultaneously transmit signals at 24 dBm and 23 dBm levels, the SAR regulations will be violated. Therefore, if the power value of the signal to be transmitted (or transmitted) by the first wireless communication chip 110 is 24 dBm, which is the maximum transmission power value, the power value to be transmitted by the second wireless communication chip 120 should be smaller than 23 dBm. That is, the transmission power control module 121 sets the transmission power value of the second wireless communication chip 120 from the maximum transmission power value according to the transmission power value of the first wireless communication chip 110 to satisfy the SAR specification, Can be back-off.

Alternatively, for example, when the power value of the signal transmitted from the first wireless communication chip 110 varies from the maximum transmission power value to about 22 dBm, the transmission power value of the signal transmitted from the second wireless communication chip 110 The transmission power control module 121 can recover the transmission power value of the signal to be transmitted from the second wireless communication chip 110 and determine the transmission power value of the transmission signal to be 23 dBm.

Table 2 below is a table showing an example of the transmission power value of the second wireless communication chip 120 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 or a recovered value (dBm) for a signal to be transmitted in the second wireless communication chip, 24 21 2 22 23 2

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 2, if the transmission power value of the signal transmitted from the first wireless communication chip 110 measured by the transmission power measurement module 111 is 24 dBm, which is the maximum transmission power value, the transmission power control module 121 may perform power back-off with respect to the transmission power value of the signal to be transmitted by the second wireless communication chip 120 and determine 21 dBm as the power value of the signal to be transmitted. That is, in this case, the transmission power control module 121 can perform a backoff of 2 dBm at 23 dBm, which is the maximum transmission power value, and determine the power value of the signal to be transmitted as 21 dBm. That is, the power back-off value is 2 dBm.

Alternatively, when the transmission power value of the signal transmitted from the first wireless communication chip 110 measured by the transmission power measurement module 111 is 22 dBm and the transmission / reception module 122 receives this value, the transmission power control module 121 recover the transmission power value to 23 dBm by performing a power recovery on the transmission signal of the second wireless communication chip 120 having the current transmission power value of 21 dBm. That is, the power recovered value is 2 dBm.

As described above, when signals are simultaneously transmitted from the first wireless communication chip 110 and the second wireless communication chip 120, the first wireless communication chip 110 can transmit a voice signal by applying the CDMA scheme, The wireless communication chip 120 can transmit data by applying the LTE scheme. That is, when the terminal 100 simultaneously transmits voice and data signals, for example, when priority is given to wireless communication for transmitting voice signals in terms of transmission power, the transmission power control module 121 sets 1 wireless communication chip 110 and the value of the transmission power value, the transmission power value of the signal to be transmitted from the second wireless communication chip 120 can be controlled.

In order to satisfy the SAR condition, it is necessary to prevent a specific radio communication chip (for example, the first radio communication chip) from transmitting a signal exceeding the maximum transmission power as much as possible. However, in order to prevent such a situation, if the transmission power value of a signal transmitted from a specific wireless communication chip is used as an instantaneous value which is a value in an arbitrary instant that changes with time, the transmission of a signal transmitted from the second wireless communication chip 120 The power value will also fluctuate according to the variation of the transmission power value of the signal transmitted from the first wireless communication chip 110. [ That is, when the transmission power value of the signal transmitted from the first wireless communication chip 110 fluctuates, the transmission power value measured by the transmission power measurement module 111 also fluctuates.

As the transmission power measured by the transmission power measurement module 111 fluctuates, the transmission power of the signal to be transmitted from the second wireless communication chip 120 also fluctuates. A method of filtering and using the transmission power value changed by the second wireless communication chip 120 in the case of such a variation of the transmission power value will be described.

The transmission power control module 121 needs to perform power back-off as soon as possible in response to the variation of the transmission power value of the signal transmitted from the first wireless communication chip 110. [ In addition, the switching from the power back-off mode to the normal mode is made as slow as possible to prevent frequent fluctuations of the transmission power value in the second wireless communication chip 120. To conceptually illustrate the implementation of this method, a back-off window and a recover window are used to describe the moving average.

Herein, the back-off window refers to a state in which the transmission signal of the second wireless communication chip 120 is subjected to the power back-off operation according to the variation of the transmission power value of the signal transmitted from the first wireless communication chip 110, Off from the time when the transmission power value of the first wireless communication chip 110 fluctuates or when the changed transmission power value is received, the transmission power value of the second wireless communication chip 120 May be a time interval until power back-off is applied. Also, the recovery window is required to perform power recovery for the transmission signal of the second wireless communication chip 120 according to the variation of the transmission power value of the signal transmitted from the first wireless communication chip 110 (I.e., in the normal mode), the transmission power value of the first wireless communication chip 110 or the transmission power value of the second wireless communication chip 120, It can mean the time interval until power recovery is applied. Hereinafter, power back-off and power recovery will be described with reference to the accompanying drawings.

3 is a diagram illustrating an example for describing power back-off or power recovery timing in the second wireless communication chip 120 in accordance with a variation of a transmission power value of a signal transmitted from the first wireless communication chip 110 .

3, when the transmission power value of the signal transmitted from the first wireless communication chip 110 (RAT 1) is 22 dBm and the transmission power of the signal transmitted from the second wireless communication chip 120 (RAT 2) 23dBm. At this time, when the transmission power value of the signal transmitted from the first wireless communication chip 110 varies by 24 dBm, the transmission power control module 121 transmits the signal to the second wireless communication chip 120 in order to satisfy the SAR condition It is necessary to back off the transmission power value of the signal from 23 dBm to 21 dBm. The transmission power control module 121 backs off the transmission power value of the signal to be transmitted from the second wireless communication chip 120 by 2 dBm. At this time, the transmission power control module 121 needs to apply power back-off as soon as possible.

To this end, the back-off window value 310 may be set to a small value in advance. That is, the transmission power control module 121 determines whether the transmission power value of the signal transmitted from the first wireless communication chip 110 has changed or not, It is desirable to perform power back-off to the time point. The back-off window value 310 may be referred to as another term such as a back-off time value.

On the other hand, when the transmission power value of the signal transmitted from the first wireless communication chip 110 varies from 24 dBm to 22 dBm, the transmission power control module 121 controls the transmission power of the signal to be transmitted from the second wireless communication chip 120 A power-recovery of 2 dBm from 21 dBm to 23 dBm can be performed. At this time, the transmission power control module 121 determines a recovery window value 320 that is set in advance from the time when the transmission power value of the signal transmitted from the first wireless communication chip 110 is changed or the changed transmission power value is received, It is desirable to perform power recovery at a later point in time. The recovery window value 210 may be referred to as another term, such as a recovery time value.

At this time, it is preferable that the predetermined back-off window value 310 and the preset recovery window value 320 are different from each other, and the back-off window value 310 is smaller than the recovery window value 320.

4 is a diagram showing another example for explaining the power back-off or power recovery timing in the second wireless communication chip 120 according to the variation of the transmission power value of the signal transmitted from the first wireless communication chip 110 .

4, when the transmission power value of the signal transmitted from the first wireless communication chip 110 (RAT 1) changes by 24 dBm, the transmission power control module 121 performs the second wireless communication It is necessary to back off the transmission power value of the signal to be transmitted from the chip 120 (RAT 2) to 21 dBm. The transmission power control module 121 backs off the transmission power value of the signal to be transmitted from the second wireless communication chip 120 by 2 dBm. At this time, the transmission power control module 121 determines whether the back-off window value 410 is equal to or greater than the back-off window value 410 from the time when the transmission power value of the signal transmitted from the first wireless communication chip 110 changes, Power back-off can be performed until the elapsed time.

As shown in Fig. 4, the transmission power value of the signal transmitted from the first wireless communication chip 110 at the A timing is changed from 24 dBm to 22 dBm, and transmitted from the first wireless communication chip 110 again at the B timing The transmission power value of the signal may be varied from 22 dBm to 24 dBm. In response to this variation, the transmit power control module 121 may perform a power recovery after the A timing and perform a power back-off after the B timing. However, when the time difference value between the A timing and the B timing is small, there is a problem that the transmission power control module 121 frequently controls the transmission power even during a temporary fluctuation. This frequent transmission power control increases the probability of causing an error in the transmission power value.

Therefore, the recovery window value can be set in advance to solve this problem. If the previously set recovery window value is greater than the time difference value 420 between the A timing and the B timing, the transmission power control module 121 determines that the temporary change of the first wireless communication chip 110 at timing A The transmission power value of the wireless communication chip 120 can be maintained as it is.

Thereafter, when the transmission power value of the signal transmitted from the first wireless communication chip 110 at the C timing is changed from 24 dBm to 22 dBm, the transmission power control module 121 determines that the recovery window value 430 has elapsed from the C timing It is possible to perform power recovery in which the transmission power value of the second wireless communication chip 120 is changed from 21 dBm to 23 dBm at the D timing.

In this way, even when the transmission power value of the signal transmitted from the first wireless communication chip 110 temporally fluctuates at the timing A and the timing B, the transmission power control module 121 determines the transmission power value of the second wireless communication chip 120 Can be kept constant.

5 illustrates the power back-off or power recovery timing in the second wireless communication chip 120 (RAT 2) according to the variation of the transmission power value of the signal transmitted from the first wireless communication chip 110 (RAT 1) And FIG.

Referring to FIG. 5, when the transmission power value of the signal transmitted from the first wireless communication chip 110 at the timing A is changed from 24 dBm to more than the 24 dBm, the transmission power control module 121 transmits, - Perform power back-off (back-off from 21dBm to 18dBm, for example) at timing B before the off-window value elapses. Thereafter, when the transmission power value of the signal transmitted from the first wireless communication chip 110 at the C timing is changed to 24 dBm, the transmission power control module 121 determines that the recovery window value 520 set in advance from the C timing has elapsed A power recovery (for example, power recovery from 18 dBm to 21 dBm) can be performed at an E timing that is a later time point. When the transmission power value of the signal transmitted from the first wireless communication chip 110 at the D timing before the E timing changes from 24 dBm to 22 dBm, the transmission power control module 121 calculates the recovery window value 530 from the D timing to the recovery window value 530 Power recovery (for example, power recovery from 21 dBm to 23 dBm) can be performed at the F timing, which is a time point after elapsing.

In this manner, the transmission power control module 121 can perform back-off or power recovery in response to changes in transmission power values of various stages in the first wireless communication chip 110.

6 is a flowchart illustrating a preferable procedure of a transmission power control method in the case where a terminal simultaneously transmits signals in a plurality of wireless communication chips.

Referring to FIG. 6, the transmission power measurement module 111 may measure a transmission power value of a signal transmitted from the first wireless communication chip 110 (S610). The receiving module 122 of the second wireless communication chip 120 may receive the transmission power value of the signal transmitted (or transmitted) from the first wireless communication chip 110 (S620). The transmission power control module 121 of the second wireless communication chip 120 then transmits the signal to be transmitted from the second wireless communication chip 120 based on the transmission power value of the received first wireless communication chip 110 The power value can be controlled (S630).

Control of the transmission power value of the transmission power control module 121 is based on the transmission of the signal to be transmitted from the second wireless communication chip 120 in accordance with the change (or variation) of the transmission power value of the signal transmitted from the first wireless communication chip 110 Is performed in a power back-off or power recovery manner with respect to the power value (S620). The transmission power control module 121 determines whether a transmission power value of a signal transmitted from the first wireless communication chip 110 has changed or a back-off time value - off window value) at step S630.

In addition, the transmission power control module 121 determines whether or not the transmission power value of the signal transmitted from the first wireless communication chip 110 has changed or a recovery time value Window value), power recovery can be performed at a point in time S630.

Thereafter, the first wireless communication chip 110 transmits the transmission power value to the second wireless communication chip 120 side, and the second wireless communication chip 110 transmits the transmission power value to the first wireless communication chip 110 side Power back-off or power recovery may be applied based on the transmit power value to transmit the signal simultaneously with the controlled transmit power value (S640).

According to the above description, when a plurality of wireless communication chips simultaneously transmit signals to which different wireless communication systems are applied, when two wireless communication chips are simultaneously transmitting at the maximum transmission power, in order to satisfy the SAR condition, It is necessary to measure the transmission power of the chip and to apply the power back-off. At this time, the transmission power control module 121 controls the transmission power value to prevent fluctuations in the frequent transmission power.

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 (13)

A method for controlling a transmission power of a signal by a terminal including two or more first and second wireless communication chips,
Receiving a transmission power value of a first signal transmitted from the first wireless communication chip; And
And controlling a transmission power value of a second signal to be transmitted by the second wireless communication chip based on a transmission power value of the first signal,
Wherein the control step comprises:
Performing a power back-off with respect to a transmission power value of the second signal by an amount corresponding to an increase in the transmission power value of the first signal when the transmission power value of the first signal fluctuates,
And performs power recovery on the transmission power value of the second signal by the amount of the downward variation of the transmission power value of the first signal when the transmission power value of the first signal fluctuates,
And controls the power completion time of the power back-off for the second signal to be faster than the completion time of the power recovery for the second signal. The method according to claim 1,
And transmitting the first signal with the received transmission power value at the same time as the transmission power value after the power back-off or the power recovery is applied. delete delete The method according to claim 1,
Wherein the first signal is a voice signal and the second signal is a data signal. The method according to claim 1,
Wherein the first and second signals are transmitted using different wireless communication schemes. delete delete A terminal apparatus for simultaneously transmitting signals in two or more first and second wireless communication chips,
A reception module for receiving a transmission power value of a first signal transmitted from the first wireless communication chip using a first wireless communication scheme; And
And a transmission power control module for controlling a transmission power value of a second signal to be transmitted by the second wireless communication chip based on the transmission power value of the received first signal,
Wherein the transmission power control module comprises:
Performing a power back-off with respect to a transmission power value of the second signal by an amount corresponding to an increase in the transmission power value of the first signal when the transmission power value of the first signal fluctuates,
And performs power recovery on the transmission power value of the second signal by the amount of the downward variation of the transmission power value of the first signal when the transmission power value of the first signal fluctuates,
And controls the power completion time of the power back-off for the second signal to be faster than the completion time of the power recovery for the second signal. 10. The method of claim 9,
A transmission power measurement module that measures a transmission power value of a first signal transmitted from the first wireless communication chip; And
And a transmission module for transmitting the measured transmission power value of the first signal. 10. The method of claim 9,
Further comprising an RF (Radio Frequency) module for simultaneously transmitting the first signal with the received transmission power value and the second signal with a transmission power value after the power back-off or the power recovery is applied, . delete delete

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