KR20120001574A - User equipment and method for controlling transmission power of user equipment - Google Patents

Abstract

PURPOSE: A terminal and method for controlling the transmission power thereof are provided to satisfy SAR(Specific Absorption Rate) rule in case two or more signals, which respectively different wireless communication methods, are transmitted. CONSTITUTION: A receiving module receives communication mode information for performing an RACH(Random Access CHannel) process in order to connect a first wireless communication chip with a base station. A power value determining module(122) determines a transmission power value of a second signal in case the first wireless communication chip transmits the first signal based on the received communication mode. The first wireless communication transmits the first signal in a first wireless communication mode.

Description

{User equipment and method for controlling transmission power of user equipment}

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

Due to the remarkable development of wireless communication technology, the use of radio waves is increasing in demand, and is widely used in medical, transportation, and everyday life as well as communication and broadcasting fields. As the use of electronic and electrical devices has increased rapidly, electromagnetic waves radiated from these radio wave utilization facilities and devices have greatly affected the human body. In particular, for mobile communications equipment, the US Federal Communication Commission (FCC) has adopted guidelines for assessing the environmental impact of radio frequency radiation in FCC 96-326 to provide for local power absorption for use in any portable transmitter. The limit for this is provided. The maximum allowable exposure limits specified here are based on exposure criteria quantified in the Specific Absorption Rate (SAR) term, which is a measure of radio frequency (RF) energy absorption. When electromagnetic waves are irradiated to the human body, the quantitative evaluation of the electromagnetic waves is carried out by SAR measurement through power measurement, electromagnetic analysis, and animal experiments. SAR is generally absorbed power per unit mass absorbed by the human body as the human body is exposed to the electromagnetic field. It is expressed as

In addition to the FCC in the United States, the European Electrotechnical Standardization Committee (CENELEC), etc., also defines SAR conditions as requirements for conformity assessment for mobile terminals. As described above, the FCC of the United States and the CENELEC of Europe, etc., are specified as important items in the conformity evaluation of the mobile communication terminal, although there is a difference in the reference value of the SAR conditions. Therefore, the mobile communication terminal must satisfy the SAR conditions (or regulations).

In general, in a wireless communication system, even when two or more different radio communication signals are simultaneously transmitted, the terminal needs to comply with the Specific Absorption Rate (SAR). have. In order to prevent the occurrence of exceeding the SAR standard when two signals are being transmitted simultaneously at the maximum power, it is necessary to estimate the power of the signal transmitted from one of the radio chips. There is a serious problem that SAR cannot be satisfied when the initial transmit power prediction is impossible in the situation where open loop power control is performed, such as the RACH state.

An object of the present invention is to provide a terminal for simultaneously transmitting a plurality of signals dedicated to different wireless communication schemes.

Another object of the present invention is to provide a method for controlling the transmission power of a terminal for simultaneously transmitting a plurality of signals dedicated to different wireless communication schemes.

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.

In order to achieve the above technical problem, a terminal according to the present invention includes a random access channel (Random Access CHannel, RACH) for a first radio communication chip transmitting a first signal to which a first radio communication scheme is applied to a base station; A receiving module for receiving communication mode information indicating whether the communication mode performs the process; And simultaneously transmitting the first and second signals in a second wireless communication chip that transmits a second signal by applying the first wireless communication chip and the second wireless communication scheme based on the received communication mode information. And a power value determination module for determining a transmission power value of the corresponding second signal.

The power value determining module is configured to power back the maximum transmit power value of the second signal and the second signal when the received communication mode of the first wireless communication chip is a first communication mode in which the RACH process is performed. The transmission power value of the second signal may be determined using the maximum power back-off value that can be turned off. Here, the determined transmission power value of the second signal is a value obtained by subtracting the maximum power back-off value of the second signal from the maximum transmission power value of the second signal.

The receiving module further receives the measured transmit power value of the first signal, wherein the power value determining module is a first communication mode in which a communication mode of the received first wireless communication chip performs the RACH process Otherwise, the transmit power value of the second signal corresponding to the received transmit power value of the first signal may be determined. Here, the determined transmission power value of the second signal is a value obtained by subtracting a power back-off value previously determined according to the transmission power value of the first signal from the highest transmission power value of the second signal. to be. In addition, the measured transmission power value of the first signal and the determined transmission power value of the second signal satisfy a specific absorption rate (SAR) regulation.

The terminal may include: a communication mode determining module configured to determine whether a communication mode operating in the first wireless communication chip is a communication mode performing a random access channel (RACH) process for accessing the base station; And the first wireless communication chip including a transmission module for transmitting the determined communication mode information. The terminal may further include an interface for connecting communication between the transmitting module and the receiving module. The interface may be a general purpose input output (GPIO) interface.

In order to achieve the above technical problem, a method for controlling the transmission power of a terminal according to the present invention includes: a first wireless communication chip transmitting a first signal to which a first wireless communication scheme is applied, for connection with a base station; Receiving communication mode information indicating whether the communication mode performs a random access channel (RACH) process; And simultaneously transmitting the first and second signals in a second wireless communication chip that transmits a second signal by applying the first wireless communication chip and the second wireless communication scheme based on the received communication mode information. And a power value determining step of determining a transmission power value of the corresponding second signal.

The method includes determining whether a communication mode operating in the first wireless communication chip is a communication mode for performing a random access channel (RACH) process for accessing the base station; And transmitting the determined communication mode information.

The determining of the power value may include: performing power back on the maximum transmit power value of the second signal and the second signal when the received communication mode of the first wireless communication chip is a first communication mode in which the RACH process is performed. The transmit power value of the second signal may be determined using a maximum power back-off value that can be turned off, and the determined transmit power value of the second signal is determined from the maximum transmit power value of the second signal. This value is obtained by subtracting the maximum power back-off value of the second signal.

The method may further include receiving a measured transmission power value of the first signal, wherein the determining of the power value may be performed by the communication mode of the received first wireless communication chip performing the RACH process. If the mode is not the first communication mode, the transmit power value of the second signal corresponding to the received transmit power value of the first signal may be determined. Here, the determined transmission power value of the second signal is a value obtained by subtracting a power back-off value previously determined according to the transmission power value of the first signal from the highest transmission power value of the second signal. to be.

According to the transmission power control method of the terminal and the terminal according to the present invention, when transmitting two or more signals to which different wireless communication schemes are simultaneously applied, it is possible to satisfy the SAR regulations.

In particular, when two or more signals to which different radio communication schemes are applied are simultaneously transmitted, even if unpredictable transmission power control is performed in a specific radio communication chip, the SAR standard can be satisfied.

Effects obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may 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 as part of the detailed description in order to provide a thorough understanding of the present invention, provide an embodiment of the present invention and together with the description, illustrate the technical idea of the present invention.
1 is a view showing an example of the configuration of a terminal 100 according to the present invention,
2 is a diagram illustrating an example of a communication mode state of the first wireless communication chip 110.
3 is a diagram illustrating another example of a communication mode state of the first wireless communication chip 110;
4 is a diagram illustrating a transition of a communication mode state of the first wireless communication chip 110;
5 is a view showing a process for controlling the power of the terminal 100 in the first wireless communication chip 110 according to the present invention, and
6 is a diagram illustrating a process for controlling the power of the terminal 100 in the second wireless communication chip 110 according to the present invention.

Hereinafter, exemplary embodiments of 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, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention. In addition, the same components will be described with the same reference numerals throughout the present specification.

In addition, in the description of the present invention, the terminal may be mobile or stationary such as a user equipment (UE), a mobile station (MS), an improved mobile station (AMS), a mobile hand set, or the like. It is assumed that all the communication devices used by the user of. 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 base station, and an access point (AP). The term "wireless communication method" in the present invention may be referred to in various forms such as a radio access technology (RAT) method. Examples of a wireless communication method or a wireless access technology method include code division multiple access (CDMA), wideband code division multiple access (WCDMA), and long term evolution (LTE).

In a wireless communication system, a terminal may receive a signal through a downlink from a base station, and the terminal may 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 the present specification, the first wireless communication chip and the second wireless communication chip are chips for transmitting signals by applying different wireless communication methods or wireless access technology methods. In the following description, for example, the first wireless communication chip is a chip using the CDMA method and the second wireless communication chip is a chip applying the LTE method, but it is not limited thereto.

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

Referring to FIG. 1, the terminal 100 includes a first wireless communication chip 110, a second wireless communication chip 120, an interface 130, and an RF front-end module 140. And an antenna 150. In addition, the first wireless communication chip 110 may further include a communication mode determining module 111, a power value measuring module 112, and a transmitting module 113. In addition, the second wireless communication chip 120 may further include a receiving module 121 and a power value determining module 122.

In radio communication, radio waves of a specific frequency band are used, and the first and second radio communication chips 110 and 120 modulate an original signal (baseband signal) into a signal of a high frequency band in a signal transmission process and receive a signal. Performs demodulation of the received high frequency signal into a baseband signal. Each wireless communication chip (110, 120) may be implemented as a "RF (Radio Frequency) chip" that modulates the signal processed in the baseband to a signal of a high frequency band, and transmits and receives signals with the baseband chip that processes the baseband signal In the process, a baseband chip may be combined with an RF chip that modulates a signal processed in the baseband into a high frequency band or demodulates a received signal into a low frequency band to process a baseband signal. In addition, the first and second wireless communication chips 110 and 120 may be implemented as separate chips as shown in FIG. 1, but may also be implemented as one chip.

As described above, the first radio communication chip 110 and the second radio communication chip 120 process the original signal as a signal of a high frequency band in a signal transmission process, and conversely, a signal of a high frequency band is based on a signal reception process. It processes the signal as a band and modulates / demodulates each.

When the terminal 100 needs to simultaneously transmit signals from the plurality of wireless communication chips 110 and 120 to which different wireless communication schemes are applied, the first wireless communication chip 110 indicates that the original signal is the first frequency band. At the same time, the second wireless communication chip 120 may perform a function of processing the original signal into a signal of a second frequency band. That is, the terminal 100 may modulate and transmit signals in different frequency bands in the first and second wireless communication chips 110 and 120 in the signal transmission process. In general, the terminal 100 transmits signals through different frequency bands when simultaneously transmitting signals processed by the first and second wireless communication chips 110 and 120.

Referring to FIG. 1, the communication mode determining module 111 of the first wireless communication chip 110 may include a random access channel for connection with a base station in a communication mode in which the first wireless communication chip 110 operates. It determines whether the communication mode is to perform the Random Access CHannel (RACH) process.

2 is a diagram illustrating an example of a communication mode state of the first wireless communication chip 110.

Referring to FIG. 2, a communication mode state of the first wireless communication chip 110 may be divided into a normal state rather than a RACH state and a RACH state. The first wireless communication chip 110 transmits and receives a normal voice signal with the base station in the normal state (210). In this normal state 210, if it is determined that a random access channel (RACH) process is required, the first wireless communication chip 110 may transition the state to the RACH state 220. When the transition to the RACH state 220, the first radio communication chip 110 of the terminal 100 that is not connected to the base station random access (Random Access) (particularly, the CDMA chip is Slotted ALOHA Random) to attempt to access the base station The probe is transmitted using the Access method. When the probe transmission fails, the first wireless communication chip 110 gradually raises the probe output until the connection is successful and transmits the probe repeatedly. When the first wireless communication chip 110 transmits the access channel, the first wireless communication chip 110 may attach the message part to the preamble part for synchronization acquisition at the base station and transmit the same. In this method, even if there is no possibility of receiving a message because the preamble is not properly received at the base station, the wireless section interference increases due to the transmission of the message, leading to a decrease in the radio capacity.

The first wireless communication chip 110 repeatedly transmits a probe until there is a response from the base station. In FIG. 2, it is shown that the repetition of raising the probe output to the maximum is performed twice, but this may be repeated until the base station responds. That is, in the RACH state 220, the first wireless communication chip 110 transmits the probe while gradually increasing the output (transmission output).

If there is a response from the base station, and it is determined that it needs to transition back to the normal state 230, the first wireless communication chip 110 may transition back to the normal state 230. In this case, as shown in FIG. 2, when there is no reverse traffic after the RACH state 220, the first wireless communication chip 110 immediately returns to the normal state 230 immediately after completion of the RACH state. Transition to

3 is a diagram illustrating another example of a communication mode state of the first wireless communication chip 110.

Referring to FIG. 3, a communication mode state of the first wireless communication chip 110 may be largely divided into a RACH state 320 and a normal state 310 or 310 instead of the RACH state. Unlike in the case of FIG. 2, when there is reverse traffic after the RACH state 220, the first radio communication chip 110 completes the RACH state 320 at least 1 ms after traffic transmission and then performs a normal state ( normal state).

4 is a diagram illustrating a transition of a communication mode state of the first wireless communication chip 110.

Referring to FIG. 4, when the first wireless communication chip 110 is in a normal state in which signals and information are exchanged with the base station, and the connection with the base station is lost due to a weak signal, the RACH is performed. Transition to a state (or unexpected state). When the first wireless communication chip 110 receives a response from the base station in the RACH state, the first wireless communication chip 110 may transition back to a normal state.

If there is no reverse traffic after the RACH state, the first radio chip 110 transitions to a normal state immediately after completion of the RACH state. However, if there is reverse traffic after the RACH state, the first wireless communication chip 110 transitions to the normal state at least 1 ms after the reverse traffic is transmitted.

As such, the communication mode determination module 111 determines whether the communication mode in which the first wireless communication chip 110 is currently operating is a RACH state mode or a normal state mode for connection with a base station.

The power value measuring module 112 measures a transmission power value to which a signal to which a first wireless communication scheme (for example, CDMA) is applied is transmitted in the first wireless communication chip 110. The power value measuring module 112 may measure a transmission power value when it is necessary to simultaneously transmit two or more signals applying different wireless communication schemes. In this case, the power value measuring module 112 may measure the transmission power value at a predetermined period while simultaneously transmitting two or more signals using different wireless communication methods.

Here, the power value measuring module 112 inside the first wireless communication chip 110 is described as measuring the transmission power of the signal transmitted from the first wireless communication chip 110, but is not necessarily limited thereto. That is, a power value measuring device or module (not shown) outside the first wireless communication chip 110 may measure a transmission power value of a signal to be transmitted by the first wireless communication chip 110.

The transmission module 113 transmits the communication mode information determined by the communication mode determination module 111 through the interface 130 to the outside of the first wireless communication chip 110 (for example, the second wireless communication chip 120 or the outside). Device or module). In addition, the transmission module 113 measures the transmission power value of the first wireless communication chip 110 measured by the power value measurement module 112 outside of the first wireless communication chip 110 (for example, the second wireless communication chip). 120, or an external device or module).

The receiving module 121 of the second wireless communication chip 120 may receive communication mode information determined by the communication mode determining module 111 from the transmitting module 113 through the interface 130. In addition, the reception module 121 may receive the transmission power value of the first wireless communication chip 110 measured by the power value measurement module 112 from the transmission module 113 through the interface 130. As another example, the receiving module 121 may be present in a power value measuring device or module external to the first wireless communication chip 110 to measure a signal transmitted from the first wireless communication chip 110 through another interface or the like. The power value may be received.

The power value determining module 122 transmits a signal to a second wireless communication chip when simultaneously transmitting signals from the first wireless communication chip 110 and the second wireless communication chip 120 transmitting a signal applying the second wireless communication scheme. In operation 120, a power value of a signal to be transmitted may be determined. At this time, the power value determination module 122 transmits the transmission power of the signal to be transmitted from the second wireless communication chip 120 based on the information on the communication mode state of the first wireless communication chip 110 received by the receiving module 121. The value can be determined.

The power value determination module 122 may transmit a signal to be transmitted by the second wireless communication chip 120 when the communication mode state of the first wireless communication chip 110 received by the receiving module 121 is a communication mode for performing the RACH process. Determine a transmit power value of a signal to be transmitted by the second wireless communication chip 120 using a maximum transmit power value of and a maximum power back-off value of a signal to be transmitted by the second wireless communication chip 120. Can be.

In particular, the power value determination module 122 may back-off the maximum power of the signal to be transmitted by the second wireless communication chip 120 at the maximum transmission power of the signal to be transmitted by the second wireless communication chip 120. A value obtained by subtracting the value may be determined as a transmission power value of a signal to be transmitted by the second wireless communication chip 120. Here, the maximum power back-off value of the signal to be transmitted by the second wireless communication chip 120 may be set in advance. For example, the maximum power back-off value of a signal to be transmitted in the second wireless communication chip 120 may be 4 dBm or 5 dBm.

In addition, the power value determining module 122 receives the first received by the receiving module 121 when the communication mode state of the first wireless communication chip 110 received by the receiving module 121 is not a communication mode for performing the RACH process. The transmission power value of the signal to be transmitted by the second wireless communication chip 120 corresponding to the transmission power value of the signal transmitted or transmitted by the wireless communication chip 110 may be determined. That is, the power value determining module 122 transmits the transmission power value of the signal to be transmitted by the second wireless communication chip 120 at the highest transmission power value of the signal to be transmitted by the second wireless communication chip 120. The predetermined power back-off value may be determined by subtracting the power back-off value according to the transmission power value measured for the signal transmitted at 110.

The following Table 1 is a table showing an example of possible transmission power values (unit: dBm) when the terminal 100 simultaneously transmits signals in a plurality of wireless communication chips 110 and 120 to which different wireless communication methods are applied. .

First wireless communication chip 2nd wireless communication chip Maximum transmit power value (dBm) 23 23 Example of transmit power value (dBm)



22 22 21 21 20 20 19 19 18 18

Referring to Table 1, the maximum transmit power value may be set in advance, and may be 23 dBm as an example. Each of the plurality of wireless communication chips 110 and 120 to which different wireless communication methods of the terminal 100 are applied may transmit a signal with a power value of up to 23 dBm. However, if a plurality of wireless communication chips (110, 120) at the same time transmitting a signal with a size of 23dBm violates SAR regulations. Therefore, when the signal is transmitted by the first wireless communication chip 110 with a maximum transmit power value of 23 dBm, the power value to be transmitted by the second wireless communication chip 120 should be smaller than 23 dBm. That is, the transmission power value of the second wireless communication chip 120 needs to be power back-off at the maximum transmission power value according to the transmission power value of the first wireless communication chip 110 to satisfy the SAR regulation. There is.

The following Table 2 is a table showing an example of a maximum transmission power value 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 to satisfy the SAR condition.

Example of the transmit power value of the first wireless communication chip (dBm) Example of transmit power value of the second wireless communication chip (dBm) Power back-off value (dBm) for 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 2, the transmission power values of the transmission signals in the first and second wireless communication chips 110 and 120 to satisfy the SAR conditions may 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 is 23dBm, which is the highest transmission power value, the power value determination module 122 uses the second wireless communication chip ( In step 120), the power value of the signal to be transmitted is determined as 18 dBm by performing back-off on the transmission power value of the signal to be transmitted. That is, in this case, the power value determining module 122 performs 5dBm back-off at 23dBm, which is the maximum transmit power value, and determines 18dBm as the power value of the signal to be transmitted. That is, the power back-off value is 5 dBm.

When simultaneously transmitting signals from the first wireless communication chip 110 and the second wireless communication chip 120, the first wireless communication chip 110 is a chip for transmitting a signal by applying the CDMA method, the second wireless communication Assuming that the chip 120 is a chip for transmitting a signal by applying the LTE scheme, the first wireless communication chip 110 mainly transmits a voice signal, the second wireless communication chip 120 mainly transmits a data signal. When the terminal 100 simultaneously transmits a voice and a data signal, the power value determination module 122 may include the first wireless communication chip 110 because priority is given to wireless communication for transmitting the voice signal in terms of transmission power. ) Determines the transmit power value of the signal to be transmitted by the second wireless communication chip 120 according to the power value transmitted by the signal. The power value determination module 122 may determine a value to back-off the power of the signal to be transmitted by the second wireless communication chip 120 as shown in Table 2, and determine the transmission power value accordingly.

In the above description, the reception module 121 and the power value determination module 122 are implemented in the second wireless communication chip. However, the reception module 121 and the power value determination module 122 are implemented in separate devices or modules. May be

The interface 130 is connected to exchange signals and information between the first wireless communication chip 110 and the second wireless communication chip 120. An example of the interface 130 is a General Purpose Input Output (GPIO). GPIO stands for general purpose IO, and it can be used for various purposes depending on how it is set in the program, not assigned to any special purpose such as Reset, Ground, or Clock pins. Say the pin. GPIOs allow you to receive keystrokes, control specific devices, and allow specific devices to operate when certain conditions occur in software.

A power amplifier (PA) (not shown) amplifies a received signal that is processed in the first wireless communication chip 110 and the second wireless communication chip 120 (especially in different frequency bands). Do this.

The RF front-end module 140 may play a role of freeing the transmission and reception of the terminal 100 and enabling a call in various environments. The RF front-end module 140 connects the antenna 150 and the first wireless communication chip 110 and the second wireless communication chip 120 in the terminal 100 to separate transmission and reception signals. Can be. In addition, the RF front-end module 140 includes a reception front-end module having a reception signal filtering filter as a module for filtering and amplifying, and a power amplifier for amplifying a transmission signal. Built-in transmitter end-end module. The RF front-end module 140 is mainly used for global system for mobile communications (GSM) terminals of a time division (TDMA) method, which requires switching between a transmission signal and a reception signal during a call. .

In addition, the RF front-end module 140 may be used to transmit a signal through multiple frequency bands, such as the terminal 100 described in the present invention. For example, the RF front-end module 140 enables the terminal 100 to simultaneously use the GSM method and the W-CDMA method. By using such an RF front-end module 140, the number of components of the terminal 100 can be reduced, and the reliability of the terminal 100 is increased, and according to the interconnection between components. The loss can be reduced.

The RF front-end module 140 reduces power consumption, significantly improving battery consumption, and enables miniaturization of components of multi-frequency bands and multi-function terminals. As shown in FIG. 1, the RF front-end module 140 may transmit signals processed in a plurality of frequency bands received from a power amplifier (not shown) through the antenna 150, respectively. have.

Although one antenna 150 is illustrated in FIG. 1, a plurality of antennas may exist in the terminal 100.

5 is a diagram illustrating a process for controlling the power of the terminal 100 in the first wireless communication chip 110 according to the present invention.

Referring to FIG. 5, the communication mode determining module 111 of the first wireless communication chip 110 determines a communication mode currently performed by the first wireless communication chip 110 (S510). When the communication mode determining module 111 determines that the communication mode of the first wireless communication chip 110 is the RACH state mode (S520), the transmitting module 113 transmits information on the determined communication mode through the interface 130. It transmits to the outside (for example, 2nd wireless communication chip).

However, when the communication mode determination module 111 determines that the communication mode of the first wireless communication chip 110 is not the RACH state mode (S520), the power value measuring module 112 determines the first wireless communication chip 110. Measure the power value of the signal transmitted from (S540). Thereafter, the transmission module 113 transmits the information on the determined communication mode and the measured power value information to the outside (for example, the second wireless communication chip) (S550).

6 is a diagram illustrating a process for controlling the power of the terminal 100 in the second wireless communication chip 110 according to the present invention.

Referring to FIG. 6, the reception module 121 receives communication mode information and a power value of a signal transmitted from the first wireless communication chip 110 from the transmission module 113 through the interface 130 (S610). If the power value determining module 122 determines that the communication mode information of the first wireless communication chip 110 received by the receiving module 121 is the RACH state mode (S620), the power value determining module 122 may determine the second radio. The second wireless communication chip 120 uses the maximum transmission power value of the signal to be transmitted by the communication chip 120 and the maximum power back-off value of the signal to be transmitted by the second wireless communication chip 120. The transmission power value of the signal to be transmitted may be determined (S630). In particular, the power value determination module 122 may back-off the maximum power of the signal to be transmitted by the second wireless communication chip 120 at the maximum transmission power of the signal to be transmitted by the second wireless communication chip 120. A value obtained by subtracting the value may be determined as a transmission power value of a signal to be transmitted by the second wireless communication chip 120. Here, the maximum power back-off value of the signal to be transmitted by the second wireless communication chip 120 may be set in advance (S630).

On the contrary, if it is determined that the communication mode state of the first wireless communication chip 110 received by the receiving module 121 is not a communication mode for performing the RACH process (S620), the power value determining module 122 determines the power value. The module 122 may determine a transmission power value of a signal to be transmitted by the second wireless communication chip 120 corresponding to the transmission power value of a signal transmitted or transmitted by the first wireless communication chip 110 (S640). That is, the power value determining module 122 transmits the transmission power value of the signal to be transmitted by the second wireless communication chip 120 at the highest transmission power value of the signal to be transmitted by the second wireless communication chip 120. In operation S640, a predetermined power back-off value to be power-backed off may be determined according to the transmission power value measured for the transmitted signal in step S640.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a 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), FPGAs ( Field Programmable Gate Arrays), processors, controllers, microcontrollers, microprocessors, and the like.

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

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention. 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 obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.

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 detailed description should not be interpreted as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (19)

Receive communication mode information indicating whether the first wireless communication chip transmitting the first signal to which the first wireless communication scheme is applied is in a communication mode performing a random access channel (RACH) process for accessing a base station; A receiving module; And
In the case where the first and second signals are simultaneously transmitted by the second wireless communication chip transmitting the second signal by applying the first wireless communication chip and the second wireless communication scheme based on the received communication mode information. And a power value determination module for determining a transmission power value of the second signal. The method of claim 1,
The power value determining module is configured to power back the maximum transmit power value of the second signal and the second signal when the received communication mode of the first wireless communication chip is a first communication mode in which the RACH process is performed. And a transmission power value of the second signal is determined using a maximum power back-off value that can be turned off. The method of claim 2,
The determined transmission power value of the second signal is a terminal, characterized in that the maximum transmission power value of the second signal subtracted the maximum power back-off value of the second signal. The method of claim 1,
The receiving module further receives the measured transmit power value of the first signal,
The power value determination module may determine that the second signal corresponding to the transmission power value of the first signal is received when the communication mode of the first wireless communication chip is not a first communication mode in which the RACH process is performed. Terminal for determining the transmission power value. The method of claim 4, wherein
The determined transmission power value of the second signal is a value obtained by subtracting a power back-off value previously determined according to the transmission power value of the first signal from the highest transmission power value of the second signal. Terminal characterized in that. The method of claim 4, wherein
The measured transmission power value of the first signal and the determined transmission power value of the second signal is characterized in that it satisfies the Specific Absorption Rate (SAR). The method of claim 1,
And a first wireless communication chip transmitting a first signal to which the first wireless communication scheme is applied. The method of claim 2,
A communication mode determining module for determining whether a communication mode operating in the first wireless communication chip is a communication mode performing a random access channel (RACH) process for accessing the base station; And
And the first wireless communication chip including a transmission module for transmitting the determined communication mode information. The method of claim 8,
And an interface for connecting communication between the transmitting module and the receiving module. The method of claim 9,
And the interface is a general purpose input output (GPIO) interface. The method of claim 1,
The first wireless communication method is a terminal having a higher priority in terms of transmit power when transmitting a signal than the second wireless communication method. The method of claim 1,
Wherein the first signal is a voice service signal and the second signal is a data service signal. Receive communication mode information indicating whether the first wireless communication chip transmitting the first signal to which the first wireless communication scheme is applied is in a communication mode performing a random access channel (RACH) process for accessing a base station; Doing; And
In the case where the first and second signals are simultaneously transmitted by the second wireless communication chip transmitting the second signal by applying the first wireless communication chip and the second wireless communication scheme based on the received communication mode information. And a power value determining step of determining a transmission power value of the second signal. The method of claim 13,
The determining of the power value may include: performing power back on the maximum transmit power value of the second signal and the second signal when the received communication mode of the first wireless communication chip is a first communication mode in which the RACH process is performed. The transmission power control method of the terminal, characterized in that for determining the transmission power value of the second signal using the maximum power back-off value that can be off (off-off). The method of claim 14,
The determined transmission power value of the second signal is a transmission power control method of the terminal, characterized in that the maximum power back-off value of the second signal subtracted from the maximum transmission power value of the second signal. The method of claim 13,
Receiving the measured transmit power value of the first signal,
The determining of the power value may include determining that the second signal corresponding to the transmission power value of the first signal is received unless the communication mode of the first wireless communication chip is a first communication mode in which the RACH process is performed. Transmission power control method of a terminal, characterized in that for determining the transmission power value. 17. The method of claim 16,
The determined transmission power value of the second signal is a value obtained by subtracting a power back-off value previously determined according to the transmission power value of the first signal from the highest transmission power value of the second signal. A transmission power control method of a terminal. 17. The method of claim 16,
The measured transmission power value of the first signal and the determined transmission power value of the second signal satisfies the Specific Absorption Rate (SAR). The method of claim 13,
A communication mode determining step of determining whether a communication mode operating in the first wireless communication chip is a communication mode performing a random access channel (RACH) process for accessing the base station; And
And transmitting the determined communication mode information.

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