Wireless communication apparatus for controlling transmission power and method of operation thereof

Abstract

The disclosure provides a wireless communication device for controlling transmission power and an operating method thereof, and particularly, a method of controlling transmission power of a wireless communication device includes obtaining first electromagnetic wave information from the wireless communication device, wherein the first electromagnetic wave information is obtained during a target duration; obtaining electromagnetic wave trend information for the target duration based on the first electromagnetic wave information and second electromagnetic wave information, wherein the second electromagnetic wave information is obtained during at least one previous duration; and controlling the transmission power based on the electromagnetic wave trend information.

Description

[0001] This application is based on and claims priority to Korean Patent Application No. 10-2020-0178923 filed on December 18, 2020, and Korean Patent Application No. 10-2021-0034241 filed on March 16, 2021, the disclosures of which are incorporated herein by reference in their entirety. Technical Field

[0002] The present invention relates to wireless communication devices, and more specifically, to wireless communication devices and methods for controlling transmission power. Background Technology

[0003] In wireless communication systems, signal transmission is susceptible to path loss, shadowing fading, and other factors. Therefore, sufficient power can be used to avoid degrading Quality of Service (QoS). In particular, high transmit power can be used for wireless communication using easily attenuated high-frequency bands (such as millimeter-wave spectrum). However, as transmit power increases, heat generation in the wireless communication device increases, and high-density electromagnetic waves can be generated during transmission. Therefore, it is desirable to reduce the energy absorbed from the wireless communication device due to electromagnetic waves, for example, the energy absorbed by the user at the terminal. Summary of the Invention

[0004] The present invention provides a method and apparatus for effectively controlling a user’s exposure to electromagnetic waves while maintaining the quality of wireless communication.

[0005] According to one aspect of the present invention, a method for controlling the transmission power of a wireless communication device is provided, the method comprising: obtaining first electromagnetic wave information from the wireless communication device, wherein the first electromagnetic wave information is obtained during a target duration; obtaining electromagnetic wave trend information within the target duration based on the first electromagnetic wave information and second electromagnetic wave information, wherein the second electromagnetic wave information is obtained during at least one previous duration; and controlling the transmission power based on the electromagnetic wave trend information.

[0006] According to one aspect of the present invention, a wireless communication device for controlling transmission power is provided, comprising: a processing circuit configured to generate electromagnetic wave trend information for a target duration based on electromagnetic wave information obtained in each of a target duration and at least one previous duration, and to control the transmission power based on the electromagnetic wave trend information; and at least one power amplifier configured to output an amplified transmission signal according to the transmission power.

[0007] According to one aspect of the present invention, a method for limiting transmission power during a measurement duration is provided. The method includes: obtaining electromagnetic wave information from a wireless communication device during a target duration; and limiting the transmission power such that only a portion of the desired transmission power is output in a limiting mode. The limiting mode is activated based on electromagnetic wave trend information within the target duration, the measurement duration including the target duration. Limiting the transmission power includes setting a transmission power limit based on a remaining rate. The remaining rate is based on the ratio of remaining transmission power to available transmission power during the measurement duration. Attached Figure Description

[0008] Embodiments of the inventive concept will become clearer from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0009] Figure 1 This is a block diagram of a wireless communication device according to an embodiment of the present invention.

[0010] Figure 2 This is a block diagram of a communication processor according to an embodiment of the present invention.

[0011] Figure 3 This is a diagram illustrating an example of limiting transmission power to limit electromagnetic wave emission according to an embodiment;

[0012] Figure 4 This is a flowchart of an operation method of a wireless communication device according to an embodiment of the present invention;

[0013] Figure 5 This is a diagram illustrating an example of obtaining electromagnetic wave information during a measurement duration according to an embodiment;

[0014] Figure 6 The illustration shows time slots including the previous duration and the target duration according to an embodiment;

[0015] Figure 7 This is a diagram illustrating an example of obtaining an amplified electromagnetic wave value during a target duration compared to a previous duration, according to an embodiment.

[0016] Figure 8 This is a flowchart of a method for determining whether to limit transmission power based on electromagnetic wave trend information within a target duration, according to an embodiment.

[0017] Figure 9 This is a flowchart of a method for outputting transmission power in any of a plurality of modes based on the remaining rate relative to the available transmission power, according to an embodiment.

[0018] Figure 10 This is a diagram illustrating an example of dividing multiple restriction modes based on a threshold rate, according to an embodiment.

[0019] Figure 11 This is a block diagram of a wireless communication device according to an embodiment for performing multiple wireless communications by using multiple power amplifiers;

[0020] Figure 12 This is a flowchart of a method for controlling transmit power when performing multiple wireless communications according to an embodiment;

[0021] Figure 13 This is a flowchart of a method for controlling transmission power when performing a first wireless communication and a second wireless communication according to an embodiment;

[0022] Figure 14 This is a diagram illustrating an example of outputting transmission power based on a transmission power limit corresponding to each of the multiple wireless communications when multiple wireless communications are executed, according to an embodiment; and

[0023] Figure 15 This is a block diagram of a wireless communication device for controlling transmission power according to an embodiment of the present invention. Detailed Implementation

[0024] In the following, embodiments of the inventive concept will be described in detail with reference to the accompanying drawings.

[0025] Figure 1 This is a block diagram of a wireless communication device 10 according to an embodiment of the present invention.

[0026] Reference Figure 1 The wireless communication device 10 according to an embodiment of the present invention may include a communication processor 100, a radio frequency integrated circuit (RFIC) 200, a power converter 300, a duplexer 400, a power amplifier 500, a power detector 600 and / or an antenna ANT.

[0027] The communication processor 100 included in the wireless communication device 10 may include a command generator 110, a transmit (TX) processor 120, and / or a receive (RX) processor 130. The communication processor (CP) 100 can process baseband signals (e.g., I and Q signals) including information to be transmitted via the transmit processor 120, according to a determined communication scheme. Additionally, the communication processor 100 can process received baseband signals via the receive processor 130 according to the determined communication scheme.

[0028] For example, the communication processor 100 can process the signal to be transmitted or received according to a communication scheme (such as Orthogonal Frequency Division Multiplexing (OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Wideband Code Division Multiple Access (WCDMA), or High-Speed ​​Packet Access+ (HSPA+)). Furthermore, the communication processor 100 can process the baseband signal according to various types of communication schemes (e.g., various communication schemes that apply techniques to modulate or demodulate the amplitude and / or frequency of the baseband signal).

[0029] The communication processor 100 can generate a power command PW_CMD via a command generator 110. This power command PW_CMD (e.g., an indication and / or inclusion instruction) outputs at least a portion of the desired (or expected) transmit power. For example, when limiting the transmit power required (or expected) for optimal (or successful) wireless communication operation based on the specific absorption rate (SAR) of the wireless communication device 10, the command generator 110 can generate a command indicating that the limited transmit power will be output. Here, the desired (or expected) transmit power may be proportional to the amplitude components of the baseband signal (e.g., the amplitudes of the I and Q signals).

[0030] The command generator 110, the transmitting processor 120, and the receiving processor 130 in the communication processor 100 can be configured by different modules to output signals, but the command generator 110, the transmitting processor 120, and the receiving processor 130 according to the present invention are not limited thereto, and can instruct processors configured by a single module to perform different functions.

[0031] The communication processor 100 can generate a transmit signal TX as an analog signal using a plurality of digital-to-analog converters (DACs) disposed therein, each DAC performing digital-to-analog conversion on the baseband signal. The communication processor 100 can receive a receive signal RX as an analog signal from the RFIC 200. Additionally, the communication processor 100 can extract the baseband signal as a digital signal by performing analog-to-digital conversion on the receive signal RX via an analog-to-digital converter (ADC) disposed therein. Here, each of the transmit signal TX and the receive signal RX can be a differential signal including both positive and negative signals.

[0032] RFIC 200 can generate an RF input signal RF_IN by up-converting the frequency of the transmitted signal TX, or a received signal RX by down-converting the frequency of the RF received signal RF_R. Specifically, RFIC 200 may include a transmitting circuit 210 configured to perform up-conversion, a receiving circuit 220 configured to perform down-conversion, and / or a local oscillator LO.

[0033] The transmitting circuit 210 may include a first mixer 211 and / or a first baseband filter 212. For example, the first baseband filter 212 may include a low-pass filter. The first baseband filter 212 may filter the transmit signal TX received from the communication processor 100 and provide the filtered transmit signal TX to the first mixer 211. The first mixer 211 may perform up-conversion to convert the frequency of the transmit signal TX from the baseband to a higher frequency band based on a frequency signal provided from the local oscillator LO. Through this up-conversion, the transmit signal TX can be provided as an RF input signal RF_IN to the power amplifier 500. The transmitting circuit 210 may also include a transmitting amplifier, which may initially amplify the power of the RF input signal RF_IN and provide the power-amplified RF input signal RF_IN to the power amplifier 500.

[0034] The power amplifier 500 receives a power supply voltage from the power converter 300 and generates an RF output signal RF_OUT by amplifying the power of the RF input signal RF_IN based on the received power supply voltage. The power amplifier 500 can then provide the generated RF output signal RF_OUT to the duplexer 400.

[0035] The receiving circuit 220 may include a second mixer 221 and / or a second baseband filter 222. The second mixer 221 performs down-conversion to switch the frequency of the RF received signal RF_R from the high-frequency band to the baseband based on a frequency signal provided from the local oscillator LO. This down-conversion allows the RF received signal RF_R to be provided as a received signal RX to the second baseband filter 222, which then filters the received signal and provides the filtered received signal RX to the communication processor 100. The receiving circuit 220 may also include a receiving amplifier, which may be, for example, a low-noise amplifier including a low-pass filter. The receiving amplifier amplifies the RF received signal RF_R received from the duplexer 400 and provides the amplified RF received signal to the second mixer 221.

[0036] For reference, the wireless communication device 10 can transmit and receive signals via multiple frequency bands using carrier aggregation (CA). Additionally, for this purpose, the wireless communication device 10 may include multiple power amplifiers 500, each configured to amplify the power of multiple RF input signals corresponding to multiple carriers. However, for ease of description, in... Figure 1 The embodiments describe an example where the number of power amplifiers 500 is 1.

[0037] When a fixed-level supply voltage is applied to the power amplifier 500, the power efficiency of the power amplifier 500 may decrease. According to an embodiment of the present invention, the power converter 300 can generate a supply voltage with dynamically changing levels in response to a power command PW_CMD, and provide the generated supply voltage to the power amplifier 500. According to an embodiment of the present invention, the communication processor 100 can determine whether to limit the transmission power based on the trend of electromagnetic wave information obtained over a target duration, and when the transmission power is limited, the communication processor 100 can set the limited transmission power based on the remaining rate relative to the available transmission power. In this case, the communication processor 100 can generate a power command PW_CMD so that only a portion of the desired transmission power for wireless communication is output according to the limited transmission power.

[0038] The duplexer 400 can be connected to the antenna ANT and separate the transmit frequency from the receive frequency. Specifically, the duplexer 400 can separate the RF output signal RF_OUT provided from the power amplifier 500 for each frequency band and provide the frequency-separated RF output signal RF_OUT to the corresponding antenna ANT. Additionally, the duplexer 400 can provide external signals received from the antenna ANT to the low-noise amplifier of the receiver circuit 220 in the RFIC 200. For example, the duplexer 400 may include a front-end module (FEMiD) with an integrated duplexer.

[0039] For reference, the wireless communication device 10 may include a switching structure capable of separating the transmission frequency from the reception frequency instead of the duplexer 400. Alternatively, the wireless communication device 10 may include a structure comprising a duplexer 400 capable of separating the transmission frequency from the reception frequency and a switch. However, for ease of description, an example of the wireless communication device 10 including a duplexer 400 capable of separating the transmission frequency from the reception frequency is described in the embodiments of the inventive concept.

[0040] The antenna ANT can send the RF output signal RF_OUT, which is frequency-separated by the duplexer 400, to the outside, or provide the duplexer 400 with the RF received signal RF_R received from the outside. The antenna ANT may include, but is not limited to, an array antenna.

[0041] The power detector 600 can generate the total transmission power output by the wireless communication device 10 during the target duration by measuring the transmission power generated by the wireless communication device 10. The power detector 600 can provide the total transmission power to the communication processor 100, and the communication processor 100 can estimate electromagnetic wave information based on the transmission power during the target duration.

[0042] The communication processor 100, RFIC 200, power converter 300, duplexer 400, power amplifier 500, and power detector 600 can be implemented as separate integrated circuits (ICs), chips, or modules. Alternatively, the communication processor 100, RFIC 200, power converter 300, duplexer 400, power amplifier 500, and power detector 600 can be mounted on a printed circuit board (PCB). However, embodiments of the present invention are not limited thereto, and in embodiments, at least some of the communication processor 100, RFIC 200, power converter 300, duplexer 400, and power amplifier 500 can be implemented as a single communication chip.

[0043] also, Figure 1 The wireless communication device 10 shown may be included in a wireless communication system using a cellular network (such as 5G, LTE, or LTE-Advanced), or in a wireless local area network (WLAN) system, a wireless fidelity (WiFi) system, a Bluetooth communication system, or other wireless communication systems. For reference, Figure 1 The configuration of the wireless communication device 10 shown is merely an example and is therefore not limited thereto. The wireless communication device 10 can be configured in various ways depending on the communication standard or communication scheme.

[0044] Figure 2 This is a block diagram of a communication processor 100 according to an embodiment of the present invention.

[0045] Reference Figure 2 Depending on the computational operation to be performed, the communication processor 100 may include an electromagnetic wave information estimator 101, a residual rate calculator 102, an electromagnetic wave trend information calculator 103, a mode selector 104, and / or a command generator 110. The entity configured to perform the corresponding computational operation may be a software module unit formed in a hardware module and configured to perform different computations, but is not limited thereto, and the entity may be formed in different hardware modules to perform the corresponding computational operation.

[0046] Electromagnetic wave information estimator 101 can be obtained from Figure 1The power detector 600 receives the total transmit power Tx_PW during the target duration and estimates the electromagnetic wave information EMW for the target duration based on the total transmit power Tx_PW. The electromagnetic wave information EMW may include, for example, SAR and / or power density (PD), and the SAR and / or PD may have values ​​proportional to the transmit power Tx_PW. According to an embodiment, the electromagnetic wave information estimator 101 may estimate the SAR and / or PD for the target duration based on a formula proportional to the transmit power Tx_PW. According to an embodiment, the electromagnetic wave information estimator 101 may calculate the SAR and / or PD based on the intensity of the transmit power during the target duration. According to an embodiment, the electromagnetic wave information estimator 101 may estimate the electromagnetic wave information EMW based on the transmit power Tx_PW based on mapping data of electromagnetic wave information stored in a memory device (e.g., a memory device included in the wireless communication device 10).

[0047] The remaining power calculator 102 receives electromagnetic wave information (EMW) for a target duration from the electromagnetic wave information estimator 101 and calculates the remaining power ratio (RR), which is the ratio of remaining transmit power to available transmit power. Here, the remaining transmit power can be a value obtained by subtracting the cumulative transmit power used during the measurement duration from the available transmit power. According to an embodiment, the communication processor 100 can update the remaining transmit power obtained during at least one previous duration based on the electromagnetic wave information obtained during the target duration (e.g., determining the amount of update for the remaining transmit power) to obtain an updated remaining transmit power. According to an embodiment, the remaining power calculator 102 can calculate the remaining power ratio (RR) as the ratio of the updated remaining transmit power to available transmit power.

[0048] The electromagnetic wave trend information calculator 103 can calculate electromagnetic wave trend information EMW_TD by receiving electromagnetic wave information EMW for a target duration from the electromagnetic wave information estimator 101. The electromagnetic wave trend information EMW_TD can be an indicator of the trend of the electromagnetic wave information EMW for the target duration relative to electromagnetic wave information EMW for at least one previous duration, such as the slope value of the electromagnetic wave information EMW for the target duration relative to electromagnetic wave information EMW for at least one previous duration.

[0049] The mode selector 104 can select any one of a plurality of modes MD based on electromagnetic wave trend information EMW_TD and residual rate RR generated by electromagnetic wave trend information calculator 103 and residual rate calculator 102, respectively. The plurality of modes MD may include limiting modes that restrict transmit power, and in particular, may include a plurality of modes that set the transmit power to be restricted according to the residual rate RR.

[0050] The mode selector 104 can determine whether to limit the transmit power based on the electromagnetic wave trend information EMW_TD, and when the SAR or PD increases significantly during the target duration, the mode selector 104 can select a mode that limits the transmit power Tx_PW. For example, when the slope value of the electromagnetic wave information EMW during the target duration exceeds a reference slope value, the mode selector 104 can select a limiting mode.

[0051] When a limiting mode is selected, mode selector 104 can determine the degree to which the transmit power Tx_PW is limited based on the residual rate RR. For example, mode selector 104 can select any one of a general limiting mode, a hold-benefit limiting mode, a save-benefit limiting mode, and / or a maximum (or highest) limiting mode, and communication processor 100 can set the limited transmit power differently for each limiting mode.

[0052] When the limited mode is set, the command generator 110 can set a limited transmit power and generate a power command PW_CMD by comparing the limited transmit power with the desired (or expected) transmit power RQ_PW. For example, when the desired (or expected) transmit power RQ_PW is lower than the limited transmit power, the command generator 110 can generate a power command PW_CMD to output the transmit power of the power amplifier 500 at the desired (or expected) transmit power RQ_PW. Otherwise, when the desired (or expected) transmit power RQ_PW is higher than or equal to the limited transmit power, the command generator 110 can generate a power command PW_CMD to cause the power amplifier 500 to output the limited transmit power.

[0053] Figure 3 This is a diagram illustrating an example of limiting transmission power to limit electromagnetic wave emission according to an embodiment.

[0054] When wireless communication is performed via wireless communication device 10, the time-averaged RF emission is limited according to a specific frequency, and whether the RF emission is limited is determined based on SAR and PD limits. In this case, the RF exposure limit can be defined based on the time-averaged exposure level during the measurement duration.

[0055] Reference Figure 3 According to an embodiment of the present invention, the instantaneous transmit power INST_PW of the wireless communication device 10 may exceed the limited transmit power PW_LIM, but the average transmit power during the measurement duration is controlled to be lower than the limited transmit power PW_LIM. That is, the exposure rate, which is the ratio of the average transmit power to the limited transmit power PW_LIM, is kept to a value of 1 or less.

[0056] The wireless communication device 10 according to the present invention can track the trend of instantaneous transmit power INST_PW and determine whether to control the transmit power below a limit transmit power PW_LIM based on the tracked trend. When the transmit power is controlled below the limit transmit power PW_LIM, the wireless communication device 10 can dynamically set the limit transmit power PW_LIM based on the remaining transmit power during the measurement duration. Therefore, the wireless communication device 10 provides a method for effectively controlling transmit power, enabling optimal (or successful) wireless communication operation (e.g., wireless communication operation at a desired signal strength) while complying with RF exposure limits.

[0057] Figure 4 This is a flowchart of the operation method of the wireless communication device 10 according to an embodiment of the present invention.

[0058] Reference Figure 4 The wireless communication device 10 can obtain electromagnetic wave trend information and determine whether to limit the transmission power by comparing the electromagnetic wave trend information with a preset (or optionally given) trend value.

[0059] In operation S10, the wireless communication device 10 can acquire electromagnetic wave information during the target duration (e.g., the target time period). The electromagnetic wave information can be either SAR and / or PD, and either SAR or PD can be selected based on the frequency band in which the wireless communication will be performed. For example, when performing wireless communication in a frequency band of 6 GHz or higher, the wireless communication device 10 can use PD as the electromagnetic wave information, and when performing wireless communication in a frequency band of 3 GHz or lower, the wireless communication device 10 can use SAR as the electromagnetic wave information. The wireless communication device 10 can acquire the transmission power generated during the target duration and determine SAR and PD based on the transmission power.

[0060] In operation S20, the wireless communication device 10 can obtain electromagnetic wave trend information based on electromagnetic wave information generated during the target duration. The electromagnetic wave trend information can indicate the degree of increase or decrease in instantaneous transmission power. The wireless communication device 10 can load electromagnetic wave information from a memory device (e.g., from a memory device included in the wireless communication device 10) for a previous duration preceding the target duration to obtain trend information over a measurement duration (e.g., a measurement time period) including the target duration. The wireless communication device 10 can obtain the electromagnetic wave trend information by comparing the electromagnetic wave information from the previous duration with the electromagnetic wave information during the target duration.

[0061] In operation S30, the wireless communication device 10 can control the transmission power based on electromagnetic wave trend information. For example, when the electromagnetic wave trend information tends to increase rapidly based on a preset (or optionally given) standard, the wireless communication device 10 can limit the transmission power. Otherwise, when the electromagnetic wave trend information tends to decrease or does not tend to increase rapidly based on a preset (or optionally given) standard, the wireless communication device 10 can output a transmission power corresponding to the required (or desired) transmission power without limiting the transmission power (e.g., without limiting the transmission power to a transmission power limit).

[0062] When the wireless communication device 10 limits the transmission power, the degree of limitation can be determined based on the ratio of the remaining transmission power to the available transmission power. That is, the wireless communication device 10 according to the present invention can dynamically set a limited transmission power (e.g., a transmission power limit) as a reference for limiting the transmission power. Therefore, the wireless communication device 10 can minimize (or reduce) the degradation of wireless communication quality while adhering to the transmission power limit (e.g., by outputting a transmission power that does not exceed the transmission power limit).

[0063] Figure 5 This is a diagram illustrating an example of obtaining electromagnetic wave information during a measurement duration according to an embodiment.

[0064] Reference Figure 5 The measurement duration may include first to nth previous durations PRV1 to PRVn (n is a natural number) and a target duration TG. The measurement duration is the duration for which the average transmit power is extracted to comply with RF exposure limits, and may have a different duration for each frequency. For example, the measurement duration may be 100 seconds in a frequency band less than 3 GHz and 60 seconds in a frequency band greater than or equal to 3 GHz and less than 6 GHz. Additionally, the measurement duration may be 4 seconds in a frequency band greater than or equal to 6 GHz. That is, when the wireless communication device 10 performs wireless communication operation in a frequency band less than 3 GHz, the wireless communication device 10 can measure SAR for 100 seconds and control the transmit power such that the average transmit power over 100 seconds does not exceed the limited transmit power PW_LIM.

[0065] The wireless communication device 10 according to the present invention can divide the measurement duration into multiple durations and control the transmission power based on the electromagnetic wave information obtained in each duration, so that the average transmission power does not exceed a limited transmission power PW_LIM.

[0066] according to Figure 5In one embodiment, the communication processor 100 in the wireless communication device 10 can divide the measurement duration into n+1 durations and obtain electromagnetic wave information within each duration. In this case, the most recently (or most recent) measured duration within the measurement duration can be the target duration TG, and the n durations preceding the target duration TG can be the first to the nth previous durations PRV1 to PRVn. The wireless communication device 10 can determine whether to limit the transmission power by comparing the electromagnetic wave information measured in the target duration TG with multiple electromagnetic wave information measured in the first to the nth previous durations PRV1 to PRVn.

[0067] The wireless communication device 10 generates electromagnetic wave trend information by comparing at least one of a plurality of previous electromagnetic wave information measured in the first to nth previous durations PRV1 to PRVn with target electromagnetic wave information measured in the target duration TG, and for example, generates a slope value of the target electromagnetic wave information relative to the plurality of previous electromagnetic wave information as electromagnetic wave information. In this case, the communication processor 100 may generate the difference between the target electromagnetic wave information and the average electromagnetic wave information of the plurality of previous electromagnetic wave information as the slope value, but is not limited thereto, and the communication processor 100 may generate the difference between the target electromagnetic wave information and the minimum (or lowest) value of the plurality of previous electromagnetic wave information as the slope value. The generation of electromagnetic wave trend information performed by the communication processor 100 is not limited to using only any one of the plurality of previous electromagnetic wave information, and may include using all of the plurality of previous electromagnetic wave information.

[0068] When the communication processor 100 limits the transmit power in a limited mode, the ratio of remaining transmit power to available transmit power can be calculated as the surplus rate, and the limited transmit power PW_LIM can be set based on a comparison obtained by comparing the surplus rate with at least one threshold rate. (Refer to...) Figure 5 The available transmit power can be set so that the transmit power output from the wireless communication device 10 during the measurement duration does not exceed a predefined (or optionally given) maximum (or highest) limit of transmit power (e.g., EMW budget). For example, when the measurement duration comprises 10 time windows, and the maximum (or highest) limit of transmit power that the wireless communication device 10 is limited to output during the measurement duration is 200 dBm, the available transmit power can be 200 dBm. In this case, the wireless communication device 10 can select one of several limiting modes based on the amount of remaining transmit power obtained by subtracting the used transmit power from 200 dBm.

[0069] When the wireless communication device 10 is not operating in limited mode, it can perform wireless communication operations at the desired transmit power, regardless of the maximum (or highest) limited transmit power. However, when the wireless communication device 10 is operating in limited mode, the limited transmit power PW_LIM can be set to any level below the maximum (or highest) limited transmit power to adjust the cumulative transmit power (e.g., EMW consumption) during the measurement duration. (Refer to below...) Figure 9 and Figure 10 A method is described for setting a variable limit for the transmit power PW_LIM, performed by the wireless communication device 10.

[0070] Figure 6 The illustration shows time slots included within the previous duration and the target duration, according to an embodiment.

[0071] Reference Figure 6 The measurement duration can be divided into n+1 durations, and the divided durations can be referred to as time windows. Each of the first to nth previous durations PRV1 to PRVn and the target duration TG can include multiple time slots. The multiple time slots can be time units defined in wireless communication operation, or, for example, units in which the transmit power required by the application processor or communication processor 100 is changed. That is, the wireless communication device 10 can obtain electromagnetic wave information for each of the first to nth previous durations PRV1 to PRVn and the target duration TG by measuring the transmit power output of each time slot and summing the transmit power measured in each time slot.

[0072] When the wireless communication device 10 is connected to two or more wireless communication systems, all electromagnetic waves connected to the two or more wireless communication systems may participate in compliance with RF emission restrictions. Different wireless communication systems (e.g., 5G New Radio (NR) and LTE systems) can be defined by different durations of time slots, and in embodiments, time windows may correspond to common multiples of the duration of time slots. For example, as... Figure 6 As shown, the duration of a time slot in the first wireless communication system RAT1 may correspond to one-quarter of the duration of a time slot in the second wireless communication system RAT2, and therefore, the time window may be a multiple of the duration of a time slot in the second wireless communication system RAT2. In embodiments, the time window may be tens of milliseconds or hundreds of milliseconds. When considering a measurement duration of several seconds or tens of seconds, the different timing between the time slots in the first wireless communication system RAT1 and the second wireless communication system RAT2 can be ignored.

[0073] Figure 7This is a graph illustrating an example of obtaining the amplified electromagnetic wave value during the target duration TG compared to the first to nth previous durations PRV1 to PRVn, according to an embodiment. Figure 8 This is a flowchart of a method for determining whether to limit transmission power based on electromagnetic wave trend information over a target duration, according to an embodiment.

[0074] Reference Figure 7 The communication processor 100 can detect that a greater amount of transmission power has been output during the target duration TG compared to the first to nth previous durations PRV1 to PRVn, and therefore, the communication processor 100 can obtain a greater... Figure 5 The example provides greater electromagnetic wave trend information. For example, the communication processor 100 can... Figure 7 The example obtained is greater than in Figure 5 The example shows a larger slope value for information about the target electromagnetic wave.

[0075] In embodiments of the present invention, whether to limit transmission power can be determined by comparing pre-specified (or optionally given) reference electromagnetic wave trend information with electromagnetic wave trend information obtained during a target duration TG. For example, when the electromagnetic wave slope value for the target duration TG is determined to be greater than the pre-specified (or optionally given) reference electromagnetic wave slope value, the wireless communication device 10 can operate in a power-limiting mode.

[0076] In the following description, the communication processor 100 obtains the trend of electromagnetic wave information by comparing the slope value of the electromagnetic wave information with a reference slope value. However, the communication processor 100 according to the present invention is not limited thereto, and embodiments that can obtain the trend of electromagnetic wave information during a target duration may be included in the present invention.

[0077] Reference Figure 8 In operation S310, the communication processor 100 can compare the slope value of the electromagnetic wave information during the target duration with a reference slope value. The reference slope value can be a reference value for the wireless communication device 10 to determine whether it is operating in a restricted mode, and the wireless communication device 10 may have a pre-specified reference slope value, but is not limited to this, and the wireless communication device 10 may have a variable reference slope value. For example, the reference slope value may vary according to the communication quality and / or power requirements and / or provisioning status of the wireless communication device 10.

[0078] In operation S320, when the slope value of the electromagnetic wave during the target duration is determined to be less than a reference slope value, the communication processor 100 can control the power amplifier 500 or the power converter 300 to output a transmission power corresponding to the desired (or expected) transmission power. The desired (or expected) transmission power can be the transmission power used by the wireless communication device 10 to perform wireless communication of the desired (or expected) quality. That is, when the slope value of the electromagnetic wave during the target duration is determined to be less than a reference slope value, the wireless communication device 10 can determine that it is not necessary to limit the SAR or PD, so as to maintain the best (e.g., high, sufficient, etc.) wireless communication quality without limiting the transmission power.

[0079] In operation S330, when the slope value of the electromagnetic wave information during the target duration is determined to be greater than or equal to a reference slope value, the communication processor 100 may limit the transmission power and output the limited transmission power. That is, when the trend of the electromagnetic wave information is determined to increase rapidly, the wireless communication device 10 may limit the transmission power so that the SAR or PD does not exceed a pre-defined (or optionally given) transmission limit. Hereinafter, an embodiment will be described in which, when the wireless communication device 10 according to the present invention operates in a limited mode, the amount of transmission power to be limited is dynamically set according to the ratio of remaining transmission power to available transmission power.

[0080] Figure 9 This is a flowchart illustrating a method for outputting transmission power in any of a plurality of modes based on a remaining rate relative to available transmission power, according to an embodiment. Figure 10 This is a diagram illustrating an example of dividing multiple restriction modes based on a threshold rate, according to an embodiment.

[0081] Reference Figure 9 The wireless communication device 10 according to the present invention can calculate the remaining rate of remaining transmit power relative to the available transmit power, and select any one of a plurality of limiting modes by comparing a plurality of threshold rates with the remaining rate. Each limiting mode can be identified based on the transmit power to be limited.

[0082] In operation S331, the communication processor 100 can compare the calculated remaining rate with a first threshold rate, and when the remaining rate is greater than or equal to the first threshold rate, it operates in general limiting mode in operation S337. According to an embodiment, the general limiting mode can be a mode that limits the transmission power to the lowest possible degree (e.g., applying the minimum limiting increment to the transmission power), and the communication processor 100 can set the power obtained by dividing the available transmission power by the number of time windows as the limited transmission power.

[0083] For example, when the available transmit power during the measurement duration is 200 dBm and the number of time windows is 10, the limited transmit power in the general limiting mode can be 20 dBm. In this case, by taking into account the transmit power and errors in electromagnetic wave information, the communication processor 100 can set the limited transmit power (e.g., transmit power limit) by subtracting a specific power amount from the power amount obtained by dividing the available transmit power by the number of time windows (e.g., the number of durations in the measurement period, such as the sum of at least one previous duration and the target duration). For example, the specific power amount can be set to 3 dBm, so the limited transmit power in the general limiting mode can be 17 dBm.

[0084] When the calculated residual rate is determined to be less than the first threshold rate, in operation S332, the communication processor 100 can compare the residual rate with the second threshold rate, and when the residual rate is greater than or equal to the second threshold rate, in operation S336, it operates in a restricted mode. (Refer to...) Figure 10 The second threshold rate may be less than the first threshold rate. According to an embodiment, the hold-limit mode may be a mode in which control is executed such that the transmission power used during the measurement duration is maintained. In the hold-limit mode, the wireless communication device 10 may set the transmission power corresponding to electromagnetic wave information of at least one previous duration outside the measurement duration (e.g., outside the measurement duration) to a limited transmission power.

[0085] Reference Figure 5 The wireless communication device 10 can control the power amplifier 500 or the power converter 300 to output transmission power in a subsequent duration (e.g., a subsequent time period) corresponding to electromagnetic wave information of a first prior duration PRV1, wherein the electromagnetic wave information was obtained at the earliest time within the measurement duration. Therefore, when the wireless communication device 10 operates in a hold-limit mode, it can control the transmission power so that the electromagnetic wave information obtained during the measurement duration is not increased, but rather maintained or reduced.

[0086] When the calculated residual rate is determined to be less than the second threshold rate, in operation S333, the communication processor 100 can compare the residual rate with the third threshold rate, and when the residual rate is greater than or equal to the third threshold rate, in operation S335, it operates in a save-limit mode. (Refer to...) Figure 10The third threshold rate may be less than the second threshold rate. The conservation-limiting mode can be a mode in which the remaining transmit power during the measurement duration is distributed and used during the subsequent measurement duration. That is, in conservation-limiting mode, the wireless communication device 10 can set a limited transmit power by the amount of power obtained by dividing the remaining transmit power by the number of time windows (e.g., the number of durations in the measurement period, such as the sum of at least one previous duration and the target duration). For example, when the available transmit power is 200 dBm, the remaining transmit power is 50 dBm, and the number of time windows is 10, the limited transmit power can be set to 5 dBm, such that 50 dBm is used in 10 time windows.

[0087] When the calculated residual rate is determined to be less than the third threshold rate, in operation S334, the communication processor 100 may operate in the maximum (or maximum) limiting mode using only the minimum (or lowest) transmit power to comply with electromagnetic wave restriction regulations. When the wireless communication device 10 operates in the maximum (or highest) limiting mode, the wireless communication device 10 may set a pre-specified (or optionally given) minimum (or lowest) transmit power to the limited transmit power.

[0088] Even when operating in restricted mode, the wireless communication device 10 according to the present invention can set the restricted transmission power differently based on the ratio of remaining transmission power to available transmission power, thereby more effectively implementing the transmission power limiting strategy to comply with electromagnetic wave restriction regulations. Furthermore, when the wireless communication device 10 performs communication operations with multiple wireless communication systems, the wireless communication device 10 can set the available transmission power and the restricted transmission power differently based on the transmission power required for each wireless communication. An embodiment of limiting transmission power when operating with multiple wireless communication systems will be described below.

[0089] Figure 11 This is a block diagram of a wireless communication device 10 according to an embodiment for performing multiple wireless communications by using multiple power amplifiers 500.

[0090] Reference Figure 11 The wireless communication device 10 can perform wireless communication operations according to multiple wireless communication systems. (As already referred to above...) Figure 1 Described Figure 11 The operation of the communication processor 100 and RFIC 200 is described in detail here, therefore. The communication processor 100, according to the present invention, can control each of the power amplifiers 500a to 500m included in the power amplifier array 500_2 to perform communication operations with a set limited transmit power, and the RFIC 200 can provide corresponding transmit signals to be sent to the power amplifiers 500a to 500m.

[0091] The power amplifier array 500_2 may include power amplifiers 500a to 500m, and each of the power amplifiers 500a to 500m may be connected to an antenna and output an amplified transmit signal through the antenna. The power amplifiers 500a to 500m included in the power amplifier array 500_2 may operate with different wireless communication systems, but are not limited thereto, and may be grouped, wherein the power amplifier group may each perform different wireless communication operations.

[0092] As a non-limiting example, the wireless communication system described below may be a wireless communication system using a cellular network (such as a 5G NR system, an LTE system, an advanced LTE system, a Code Division Multiple Access (CDMA) system, or a Global System for Mobile Communications (GSM) system), a Wireless Personal Area Network (WPAN), or another wireless communication system.

[0093] The wireless communication device 10 according to the present invention can perform wireless communication operations with multiple wireless communication systems simultaneously or concurrently, and sets the available transmission power of each wireless communication system based on multiple electromagnetic wave information from the multiple wireless communication systems. For example, the wireless communication device 10 can operate with both NR and LTE systems, and set the available transmission power differently for each system.

[0094] Figure 12 This is a flowchart of a method for controlling transmission power when performing multiple wireless communications according to an embodiment.

[0095] Reference Figure 12 When the wireless communication device 10 performs wireless communication based on multiple wireless communication systems, the wireless communication device 10 can control the transmission power by obtaining the electromagnetic wave information of each wireless communication system and setting the available transmission power for each wireless communication system.

[0096] In operation S40, the wireless communication device 10 can obtain electromagnetic wave information for each wireless communication system. According to an embodiment, the operating frequency band can vary for each wireless communication system, and either the SAR and / or PD of the frequency band can be obtained as electromagnetic wave information. For example, SAR can be used as electromagnetic wave information for LTE / Frequency Range 1 (FR1) communication systems performing wireless communication operations in a frequency band of 6 GHz or lower, and PD can be used as electromagnetic wave information for NR communication systems performing wireless communication operations in a frequency band greater than 6 GHz.

[0097] In operation S50, the wireless communication device 10 can determine the wireless communication systems active during the target duration. When it is determined that only one wireless communication system is active during the target duration, the wireless communication device 10 can, according to... Figure 4In some embodiments, the transmission power is controlled to perform communication operations. Otherwise, when it is determined that multiple wireless communication systems are active (e.g., when multiple different wireless communications are being performed), in operation S60, the wireless communication device 10 sets a limited electromagnetic wave value for each wireless communication system.

[0098] According to an embodiment, the restricted electromagnetic wave value for each wireless communication system can be set to satisfy mathematical formula 1.

[0099] [Mathematical Formula 1]

[0100]

[0101] SAR avr,n and PD avr,m This could be electromagnetic wave information obtained during operation S40 during the measurement duration, where SAR avr,n It can be the average of the SAR outputs from n RF sources, and PD avr,m It can be the average value of the PD outputs from m RF sources. SAR limit These can be predefined (or optionally given) SAR limits, and PD limit This can be a predefined (or optionally given) limit value for the PD. That is, It can be the total exposure ratio (TER) of SAR during the measurement duration, and The TER can be the PD during the measurement duration. According to embodiments of the present invention, when wireless communication operation is performed by multiple RF sources (e.g., RF resources of wireless communication device 10), wireless communication device 10 can control the transmit power such that the sum of the TERs of all RF sources is 1 or less.

[0102] The electromagnetic wave value set for each wireless communication system can be a TER (Terminal Range), and the wireless communication device 10 can adjust the TER based on electromagnetic wave information obtained during the measurement duration. For example, since the LTE system is considered an anchor point in an E-UTRAN NR-Dual Connectivity (EN-DC) environment, the wireless communication device 10 can first set the TER for the LTE system and then allocate the remaining power based on the PD's TER. In this case, the PD's TER can be a value obtained by subtracting the LTE system's TER from 1. However, embodiments of the inventive concept are not limited to this, and the wireless communication device 10 can determine the TER by weighted averaging of electromagnetic wave information obtained during the measurement duration, or by setting the TER based on priority according to a wireless communication strategy.

[0103] In operation S70, the wireless communication device 10 can control the transmission power based on a limited electromagnetic wave value set in operation S60. The limited electromagnetic wave value can be a TER set in operation S60, and the wireless communication device 10 can determine whether to limit the available transmission power by comparing the set TER with the TER based on subsequently measured electromagnetic wave information. For example, when the subsequently measured TER exceeds the set TER, the transmission power can be controlled by limiting the available transmission power; however, when the subsequently measured TER is less than the set TER, the transmission power can be controlled without limiting the available transmission power.

[0104] Figure 13 This is a flowchart of a method for controlling transmission power when performing a first wireless communication and a second wireless communication according to an embodiment.

[0105] When the wireless communication device 10 performs wireless communication operations with a first wireless communication system and a second wireless communication system that are distinct from each other, a limited electromagnetic wave value can be set for each wireless communication system. In this case, according to the embodiment, the wireless communication device 10 can control the transmission power of any one wireless communication system according to the priority of the first wireless communication system and the second wireless communication system, and then control the transmission power of the other wireless communication system.

[0106] In operation S610, the wireless communication device 10 can set a first-limited electromagnetic wave value based on electromagnetic wave information obtained when the first wireless communication system is executed (e.g., communication is performed via the first wireless communication system). The first-limited electromagnetic wave value can be a limit value for the TER used in the first wireless communication system, and the limit value for the TER can be set differently depending on the communication strategy.

[0107] In operation S710, the wireless communication device 10 may obtain a new electromagnetic wave value based on electromagnetic wave information acquired during the subsequent measurement duration, and compare the first-limited electromagnetic wave value with the electromagnetic wave value acquired when the first wireless communication is performed. For example, the wireless communication device 10 may calculate a new TER of the SAR based on the SAR acquired during the measurement duration after operation S610, and compare the calculated TER with the limit value of the TER used for the first wireless communication.

[0108] When the electromagnetic wave value obtained during the execution of the first wireless communication exceeds a first limit electromagnetic wave value, in operation S720, the wireless communication device 10 may limit the available transmission power used for the first wireless communication. According to an embodiment, the wireless communication device 10 may set the available transmission power as a value obtained by multiplying the first limit electromagnetic wave value by a transmission power corresponding to a predefined (or optionally given) electromagnetic wave information. For example, the available transmission power may be set as a value obtained by multiplying the TER limit value by a transmission power corresponding to a predefined (or optionally given) SAR limit value. However, embodiments of the inventive concept are not limited thereto and may include embodiments that limit the transmission power to be output by the first wireless communication to comply with electromagnetic wave limitation regulations.

[0109] When the electromagnetic wave value obtained during the execution of the first wireless communication is less than or equal to the first limited electromagnetic wave value, in operation S730, the wireless communication device 10 can limit the transmission power without limiting the available transmission power. (As already referred to above...) Figure 4 Embodiments of the inventive concept of limiting transmission power have been described, therefore, their detailed description is omitted here.

[0110] In operation S620, the wireless communication device 10 can set a second restricted electromagnetic wave value for a second wireless communication system different from the first wireless communication system. According to an embodiment, the second wireless communication system may have a lower priority than the first wireless communication system, and the second restricted electromagnetic wave value can be determined based on the set first restricted electromagnetic wave value. The second restricted electromagnetic wave value can be a TER (Terminal Limit) limit value for the second wireless communication system, and the TER limit value can be set differently depending on the communication strategy.

[0111] In operation S740, the wireless communication device 10 may obtain a new electromagnetic wave value based on electromagnetic wave information acquired during the subsequent measurement duration, and compare the second-limited electromagnetic wave value with the electromagnetic wave value acquired when the second wireless communication is performed. For example, the wireless communication device 10 may calculate a new TER of the SAR based on the SAR acquired during the measurement duration after operation S620, and compare the calculated TER with the limit value of the TER used for the second wireless communication.

[0112] When the electromagnetic wave value obtained during the execution of the second wireless communication exceeds the second limit electromagnetic wave value, in operation S750, the wireless communication device 10 may limit the available transmission power for the second wireless communication. When the electromagnetic wave value obtained during the execution of the second wireless communication is less than or equal to the second limit electromagnetic wave value, in operation S760, the wireless communication device 10 may limit the transmission power without limiting the available transmission power.

[0113] Figure 14This is a diagram illustrating an example of outputting transmission power based on a transmission power limit corresponding to each of the multiple wireless communications when multiple wireless communications are executed, according to an embodiment.

[0114] Reference Figure 14 The wireless communication device 10 can simultaneously or concurrently perform different wireless communications based on the NR system and the LTE system during a time period between 100 seconds and 350 seconds. In this case, according to an embodiment of the present invention, the available transmit power (e.g., Available_NR) for the NR system can be set differently from the available transmit power (e.g., Available_LTE) for the LTE system, and even when the output instantaneous transmit power (e.g., Inst_NR and Inst_LTE) is higher than the available transmit power, the average transmit power (e.g., Avg_NR and Avg_LTE) of each wireless communication system is controlled to be lower than the available transmit power.

[0115] Figure 15 This is a block diagram of a wireless communication device 2000 for controlling transmission power according to an embodiment of the present invention.

[0116] Reference Figure 15 The wireless communication device 2000 may include an application processor (AP) 2100, a memory 2200, a display 2300, and / or an RF module 2410. Furthermore, the wireless communication device 2000 may also include various components such as lenses, sensors, and / or audio modules.

[0117] The AP 2100 can be implemented as a System-on-Chip (SoC) and includes a Central Processing Unit (CPU) 2110, Random Access Memory (RAM) 2120, Power Management Unit (PMU) 2130, Memory Interface (I / F) 2140, Display Controller (DCON) 2150, Communication Processor 2160, and / or System Bus 2170. Furthermore, the AP 2100 may also include various integrated processors (IPs). Because the functionality of the communication processor chip is integrated within it, the AP 2100 may be referred to as a ModAP.

[0118] The CPU 2110 typically controls the operation of the AP 2100 and the wireless communication device 2000. The CPU 2110 controls the operation of each component in the AP 2100. Furthermore, the CPU 2110 can be implemented with multiple cores. A multi-core CPU is a single computing component with two or more independent cores.

[0119] RAM 2120 can temporarily store programs, data, or instructions. For example, programs and / or data stored in memory 2200 can be temporarily stored in RAM 2120 according to the control or boot code of CPU 2110. RAM 2120 can be implemented by dynamic RAM (DRAM) or static RAM (SRAM).

[0120] The PMU 2130 manages the power of each component in the AP 2100. The PMU 2130 can also determine the operation status of each component in the AP 2100 and control the operation of the AP 2100.

[0121] The memory I / F 2140 typically controls the operation of the memory 2200 and controls the data exchange between each component in the AP 2100 and the memory 2200. In response to a request from the CPU 2110, the memory I / F 2140 can write data to or read data from the memory 2200.

[0122] The DCON 2150 can send image data to the display 2300 to be displayed on the display 2300. The display 2300 can be implemented by a flat panel display (such as a liquid crystal display (LCD), an organic light-emitting diode (OLED), or a flexible display).

[0123] The communication processor 2160 can modulate the data to be transmitted to suit the wireless communication environment and demodulate the received data. The communication processor 2160 can perform digital communication with the RF module 2410.

[0124] For reference, the above refers to... Figure 1 The described communication processor 100 can be implemented in the communication processor 2160.

[0125] RF module 2410 can convert high-frequency signals received through the antenna into low-frequency signals and send the low-frequency signals to communication processor 2160. Additionally, RF module 2410 can convert low-frequency signals received from communication processor 2160 into high-frequency signals and send the high-frequency signals to the outside of wireless communication device 2000 through the antenna. Furthermore, RF module 2410 can amplify or filter signals.

[0126] For reference, the above refers to... Figure 1 The described RFIC 200, power converter 300, duplexer 400, power amplifier 500, and / or antenna ANT can be implemented in RF module 2410. Therefore, the power converter can be implemented in RF module 2410, as referenced above. Figures 4 to 14 As stated above.

[0127] When determining the output transmit power of a wireless communication device, there is a trade-off between the high service quality provided by high transmit power and the high heat and electromagnetic wave absorption resulting from high transmit power. Conventional devices used for wireless communication determine high output transmit power to provide high service quality without adequately considering the excessive heat and electromagnetic wave absorption caused by high transmit power. Therefore, conventional devices generate excessive heat and may absorb excessive electromagnetic energy by users of conventional devices, especially in devices using high-frequency bands such as mmWave.

[0128] However, according to embodiments, improved devices for wireless communication are provided. For example, the improved devices set transmit power limits to prevent or reduce excessive transmit power output. Therefore, the improved devices overcome the shortcomings of conventional devices, reducing heat generation and electromagnetic energy absorption while maintaining sufficiently high service quality, particularly in devices using high-frequency bands such as mmWave.

[0129] According to an embodiment, the operations performed herein by the wireless communication device 10, communication processor 100, RFIC 200, power converter 300, duplexer 400, power amplifier 500, power detector 600, command generator 110, transmitting processor 120, receiving processor 130, transmitting circuit 210, receiving circuit 220, local oscillator LO, first mixer 211, first baseband filter 212, second mixer 221, second baseband filter 222, electromagnetic wave information estimator 101, residual rate calculator 102, electromagnetic wave trend information calculator 103, mode selector 104, power amplifier array 500_2, wireless communication device 2000, AP 2100, RF module 2410, CPU 2110, PMU 2130, memory interface 2140, display controller 2150 and / or communication processor 2160 can be executed by processing circuitry. As used in this disclosure, the term "processing circuit" can refer to, for example, hardware that includes logic circuitry; a hardware / software combination (such as a processor that executes software); or a combination thereof. More specifically, processing circuitry may include, but is not limited to, a central processing unit (CPU), an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field-programmable gate array (FPGA), a system-on-a-chip (SoC), a programmable logic unit, a microprocessor, an application-specific integrated circuit (ASIC), and the like.

[0130] The various operations of the above-described methods can be performed by any suitable device capable of performing the operations (such as the processing circuits discussed above). For example, as mentioned above, the operations of the above-described methods can be performed by various hardware and / or software implemented in some form of hardware (e.g., processors, ASICs, etc.).

[0131] The software may include an ordered list of executable instructions for implementing logical functions and may be implemented in any processor-readable medium (e.g., memory included in the wireless communication device 10) for use by or in conjunction with an instruction execution system, device, or apparatus (e.g., a single-core or multi-core processor or a system containing a processor).

[0132] The blocks or operations of methods (or algorithms) and functions described in conjunction with some example embodiments disclosed herein can be implemented directly in hardware, in software modules executed by a processor, or a combination of both. If implemented in software, the functions can be stored as one or more instructions or code on or transferred through a tangible, non-transitory computer-readable medium. The software module can reside in random access memory (RAM), flash memory, read-only memory (ROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the art.

[0133] The embodiments can be described with reference to the actions and symbolic representations of the operations implemented by the units and / or devices discussed in more detail below (e.g., in the form of flowcharts, flow diagrams, data flow diagrams, block diagrams, etc.). Although discussed in a particular manner, the functions or operations specified in a particular box may be performed differently from the processes specified in the flowcharts, flow diagrams, etc. For example, functions or operations shown to be performed serially in two consecutive boxes may actually be performed concurrently, simultaneously, synchronously, or in some cases in the reverse order.

[0134] While the inventive concept has been specifically shown and described with reference to embodiments therein, it should be understood that various changes in form and detail may be made therein without departing from the spirit and scope of the appended claims.

Claims

1. A method for controlling the transmission power of a wireless communication device, the method comprising: First electromagnetic wave information is obtained from the wireless communication device, wherein the first electromagnetic wave information is obtained during the target duration; Electromagnetic wave trend information within the target duration is obtained based on first electromagnetic wave information and second electromagnetic wave information, wherein the second electromagnetic wave information was obtained during at least one previous duration; and The transmission power is controlled based on the electromagnetic wave trend information. The electromagnetic wave trend information includes the slope value of the first electromagnetic wave information relative to the second electromagnetic wave information.

2. The method according to claim 1, wherein, The first electromagnetic wave information includes at least one of specific absorption rate (SAR) or power density (PD).

3. The method according to claim 2, wherein, The step of obtaining the first electromagnetic wave information includes: calculating at least one of the SAR or the PD based on the intensity of the transmission power output from the wireless communication device during the target duration.

4. The method according to claim 1, wherein The target duration includes multiple time slots; and The step of obtaining the first electromagnetic wave information is based on the transmission power used for each of the plurality of time slots.

5. The method according to claim 1, wherein, The step of controlling the transmission power includes: In response to the slope value being greater than or equal to a reference slope value, the transmission power is output based on a transmission power limit; and In response to the slope value being less than the reference slope value, the desired transmission power is output.

6. The method according to claim 1, further comprising: The remaining transmission power obtained during the at least one previous duration is updated based on the first electromagnetic wave information to obtain the updated remaining transmission power; as well as The transmission power limit is set based on the updated ratio of remaining transmission power to available transmission power.

7. The method according to claim 1, further comprising: Setting a limit on the electromagnetic wave value for each of several different wireless communications performed based on multiple radio frequency (RF) resources; as well as The transmission power is output based on a transmission power limit such that the average electromagnetic wave value measured during the measurement duration is less than the limited electromagnetic wave value, wherein the measurement duration includes the target duration and the at least one previous duration.

8. A wireless communication device for controlling transmission power, the wireless communication device comprising: The processing circuit is configured as follows: Based on electromagnetic wave information obtained in each of the target duration and at least one previous duration, electromagnetic wave trend information within the target duration is generated, and The transmission power is controlled based on the electromagnetic wave trend information; as well as At least one power amplifier is configured to output an amplified transmission signal according to the transmission power. The electromagnetic wave trend information includes the slope value of the electromagnetic wave information obtained during the target duration relative to the electromagnetic wave information obtained during the at least one previous duration.

9. The wireless communication device as claimed in claim 8, wherein, The electromagnetic wave information includes at least one of specific absorption rate (SAR) or power density (PD).

10. The wireless communication device as claimed in claim 9, wherein, The processing circuit is configured as follows: Detecting the strength of the transmission power output from the wireless communication device during the target duration; and The at least one of the SAR or the PD is calculated based on the strength of the transmit power output from the wireless communication device.

11. The wireless communication device as claimed in claim 8, wherein, The target duration includes multiple time slots; and The processing circuit is configured to obtain the electromagnetic wave information based on the transmission power for each of the plurality of time slots during the target duration.

12. The wireless communication device as claimed in claim 8, wherein, The processing circuit is configured as follows: In response to the slope value being greater than or equal to a reference slope value, the transmission power is limited; and In response to the slope value being less than the reference slope value, the limitation on the transmission power is skipped.

13. The wireless communication device as claimed in claim 8, wherein, The processing circuit is further configured to: Based on the electromagnetic wave information obtained during the target duration, the remaining transmission power obtained during the at least one previous duration is updated to obtain an updated remaining transmission power; and The transmission power limit is set based on the updated ratio of remaining transmission power to available transmission power.

14. The wireless communication device as claimed in claim 8, wherein, The processing circuit is further configured to: For each of several different wireless communications performed based on multiple radio frequency (RF) resources, a limit is set on the electromagnetic wave value, and The transmission power is limited such that the average electromagnetic wave value measured during the measurement duration is less than the limited electromagnetic wave value, wherein the measurement duration includes the target duration and the at least one previous duration.

15. A method for limiting transmission power during a measurement duration, the method comprising: Electromagnetic wave information is obtained from a wireless communication device during the target duration; as well as The transmission power is limited so that only a portion of the desired transmission power is output in a limited mode. This limited mode is activated based on electromagnetic wave trend information within the target duration, where the measured duration includes the target duration. The step of limiting the transmission power includes setting a transmission power limit based on a remaining power ratio, wherein the remaining power ratio is based on the ratio of remaining transmission power to available transmission power during the measurement duration, and The electromagnetic wave trend information includes the slope value of the electromagnetic wave information for the target duration relative to the electromagnetic wave information for at least one previous duration.

16. The method according to claim 15, wherein, The step of setting the transmit power limit is based on the remaining rate being greater than or equal to a first threshold rate, by setting the transmit power limit to a value obtained by dividing the available transmit power by the duration, wherein the duration is based on at least one previous duration and the target duration.

17. The method according to claim 15, wherein, The step of setting the transmit power limit is based on the remaining rate being less than a first threshold rate and greater than or equal to a second threshold rate, and sets the transmit power limit to the transmit power during a first previous duration outside the measured duration.

Images