WO2013024538A1

WO2013024538A1 - Wireless communication apparatus and method for controlling wireless apparatus

Info

Publication number: WO2013024538A1
Application number: PCT/JP2011/068630
Authority: WO
Inventors: 聡金沢; 藤本　俊文; 徳明高橋
Original assignee: 富士通株式会社
Priority date: 2011-08-17
Filing date: 2011-08-17
Publication date: 2013-02-21

Abstract

The present invention provides a wireless communication apparatus that reduces power consumption, and a method for controlling the wireless communication apparatus. An RF unit (1) receives a wireless signal including an already-known synchronization signal for synchronizing with the operation of a reception circuit. A replica generator generates a reproduction of the synchronization signal. A temperature-measurement unit (13) measures the temperature of the interior of the apparatus. A detection-range-setting unit (14) sets a detection range for detecting the position of the synchronization signal in the wireless signal received from the RF unit (1) on the basis of the temperature measured by the temperature measurement unit (13). A peak detector (7) detects the synchronization timing for the detection range set by the detection-range-setting unit (14) for the wireless signal on the basis of the correlation peak found using a calculation of the correlation between the reproduction of the synchronization signal and the wireless signal. A signal processor (16) processes the wireless signal on the basis of the synchronization timing detected by the peak detector (7).

Description

Wireless communication apparatus and wireless communication apparatus control method

The present invention relates to a wireless communication device and a wireless communication device control method.

Recently, the 3GPP (3 ^rd Generation Partnership Project) which is a communication standards body, is standardized communication system called an LTE (Long Term Evolution) has been promoted. When performing communication using the LTE method, the wireless communication terminal checks whether there is reception from the base station at regular time intervals when the signal transmission / reception processing is not performed, and waits for other times. An intermittent reception operation is performed. And in order to reduce power consumption, the radio | wireless communication terminal has stopped the function which performs the process of a received signal during standby. The function for processing the reception signal includes a function for generating an operation clock synchronized with the reception signal (hereinafter referred to as “reception circuit operation clock”). The reception circuit operation clock is used for reception signal processing performed by, for example, a path timing detection circuit. That is, in the standby wireless communication terminal, only a clock of a crystal oscillator (RTC: Real Time Clock) mounted on the wireless communication terminal is operating as the clock oscillator.

Also, when starting intermittent reception, the wireless communication terminal measures the error between the RTC and the receiving circuit operation clock, and multiplies the measured error by the number of RTCs from the previous intermittent reception to the current intermittent reception. Thus, the total amount of error from the previous intermittent reception to the current intermittent reception is calculated. Then, the wireless communication terminal predicts the synchronization timing at the current intermittent reception by using the total amount of errors generated from the previous intermittent reception to the current intermittent reception and the synchronization timing used at the previous intermittent reception. .

However, the error between the RTC and the receiver circuit operation clock varies depending on temperature conditions. Therefore, the actual synchronization timing may be different from the synchronization timing predicted using the measured error. Therefore, when performing intermittent reception, the wireless communication terminal performs processing called path timing tracking processing before performing data processing on the received signal, corrects the predicted synchronization timing, and matches the actual synchronization timing. By performing this correction, the wireless communication terminal can perform reception signal processing at a more accurate path timing. In LTE, these synchronization processes are performed using RS (Reference Signal) which is a signal for synchronization having a pattern specific to a base station that transmits a signal.

Here, an outline of a conventional path timing detection process will be described. The wireless communication terminal receives a signal from the base station. The signal from this base station is handled in units of time called frames. One frame is, for example, 10 ms. Further, a signal of one frame is composed of, for example, ten 1 ms subframes, and transmission / reception is performed in units of subframes. The subframe is composed of a plurality of symbols, which are the minimum unit of data during communication. And RS is contained in the predetermined symbol of the symbols which comprise one sub-frame.

Next, the wireless communication terminal adds the time measured by the RTC to the timing of receiving the previous RS, and further adds the total amount of error between the RTC and the receiving circuit operation clock, and the signal received this time The predicted RS timing is obtained. Hereinafter, the predicted RS timing is referred to as “predicted RS timing”.

Then, the wireless communication terminal sets a path timing detection window for setting a predetermined time around the predicted RS timing. The wireless communication terminal detects a position having the same waveform as that of the known RS replica within the range of the path timing detection window by the correlation calculation process. At this time, the radio communication terminal extracts a waveform that matches the RS replica with the upper limit from the position of the predicted RS timing to the preset path timing tracking width. The process of extracting a waveform that matches the replica of the RS within the range up to the path timing tracking width centered on the predicted RS timing is called “path timing tracking process”. Here, if a waveform that matches the replica of the RS is not detected before the path timing tracking width, the wireless communication terminal determines that the timing moved from the predicted RS timing to the limit of the path timing tracking width is a new predicted RS timing. And Then, at the time of the next intermittent reception, the wireless communication terminal performs the path timing tracking process again using the new predicted RS timing.

By performing the path timing detection process described above and specifying the position of the RS, the wireless communication terminal can specify the start timing of the frame. During continuous reception, the wireless communication terminal performs periodic path timing detection processing based on the reception circuit operation clock, and therefore can always operate according to the timing synchronized with the latest wireless frame.

In such a path timing detection process, a conventional technique for widening a detection window width for detecting a propagation path of a radio wave when the moving speed is fast is provided so that the power consumption of the wireless communication terminal can be reduced. . Further, in order to reduce the processing load of the wireless communication terminal, it is determined from a plurality of tracking widths for detecting the propagation path of the radio wave based on the magnitude relationship between the moving speed detected in the wireless communication terminal and the speed threshold. Conventional techniques for selecting one are provided.

JP 2001-267961 A JP 2002-164817 A

Here, conventionally, the RS timing is predicted based on the error between the RTC at the highest temperature and the operation clock of the receiving circuit. This is because the error becomes the largest at the highest temperature among the allowable values of the internal temperature of the wireless communication terminal. Further, the size of the path timing detection window width is determined on the assumption that the path timing detection window width can be detected even when an actual RS exists at a position farthest from the expected RS timing. Therefore, the same path timing detection window width is used regardless of whether the temperature is high or low.

However, since the RS timing is predicted using the error at the maximum temperature, the difference between the predicted timing and the actual RS timing should be small at high temperatures. If so, in the conventional method using a large path timing detection window width at both high and low temperatures, wasteful processing is performed and wasteful power consumption occurs.

In addition, when the moving speed is high, the temperature is not taken into account when using the conventional technology that widens the detection window width for detecting the propagation path of radio waves, thus reducing wasteful processing and reducing power consumption. It was difficult. Furthermore, the temperature is not taken into account in the prior art that selects one of a plurality of tracking widths for detecting a radio wave propagation path based on the magnitude relationship between the moving speed and the speed threshold. Therefore, it has been difficult to reduce wasteful processing and reduce power consumption.

The disclosed technology has been made in view of the above, and an object thereof is to provide a wireless communication device and a wireless communication device control method with reduced power consumption.

In the wireless communication device and the wireless communication device control method disclosed in the present application, in one aspect, the signal reception unit receives a wireless signal including a known synchronization signal for synchronizing the operation of the reception circuit. The replica generation unit generates a replica of the synchronization signal. The temperature measurement unit measures the temperature inside the device itself. The detection range determination unit determines a detection range for detecting the position of the synchronization signal in the radio signal received by the signal reception unit based on the temperature measured by the temperature measurement unit. The synchronization detection unit detects a synchronization timing in the detection range determined by the detection range determination unit in the radio signal based on a correlation peak obtained by a correlation calculation between the copy of the synchronization signal and the radio signal. The signal processing unit processes the radio signal based on the synchronization timing detected by the synchronization detection unit.

According to one aspect of the wireless communication device and the wireless communication device control method disclosed in the present application, there is an effect that power consumption can be reduced.

FIG. 1 is a block diagram of a wireless communication apparatus according to the first embodiment. FIG. 2 is a diagram illustrating an example of a table representing the correspondence between temperature, path timing detection window width, and path timing tracking width. FIG. 3 is a flowchart of the path timing detection process when the temperature condition is divided into two stages. FIG. 4 is a flowchart of the path timing detection process when the temperature condition is divided into three stages. FIG. 5 is a hardware configuration diagram of the wireless communication apparatus according to the first embodiment. FIG. 6 is a block diagram of a wireless communication apparatus according to the second embodiment. FIG. 7 is a flowchart of a path timing detection process of the wireless communication apparatus according to the second embodiment. FIG. 8 is a diagram for explaining detection of correlation peak timing in intermittent reception by the wireless communication apparatus according to the second embodiment.

Hereinafter, embodiments of a wireless communication device and a wireless communication device control method disclosed in the present application will be described in detail with reference to the drawings. The wireless communication apparatus and the wireless communication apparatus control method disclosed in the present application are not limited by the following embodiments. In the following, a mobile phone will be described as an example of a wireless communication device. However, the present invention is not limited thereto, and any device that performs wireless communication may be used.

FIG. 1 is a block diagram of the wireless communication apparatus according to the first embodiment. Here, a mobile phone will be described as an example of the wireless communication device. Hereinafter, it is simply referred to as a “wireless communication device”. As shown in FIG. 1, the radio communication apparatus according to this embodiment includes an RF (Radio Frequency) unit 1, an A / D (Analog / Digital) unit 2, an FFT (Fast Fourier Transform) unit 3, a replica correlation unit 4, and An RS replica generation unit 5 is included. Further, the wireless communication device includes an IFFT (Inverse Fast Fourier Transform) unit 6, a peak detection unit 7, an RTC (Real Time Clock) 8, a reception circuit operation clock 9, an error measurement unit 10, a peak timing correction unit 11, and a peak timing holding. Part 12 is provided. Further, the wireless communication apparatus includes a temperature measurement unit 13, a detection range determination unit 14, a radio frame head timing calculation unit 15, a signal processing unit 16, and a Cell-ID detection unit 18.

The RF unit 1 receives a radio signal from the base station via an antenna. Hereinafter, the radio signal received by the RF unit 1 from the base station is referred to as a received signal. For example, the RF unit 1 performs reception of a radio signal from the base station using a frame period of 10 ms. For example, the RF unit 1 receives a data packet in units of 1 ms subframes. A subframe divided into 12 or 14 is a symbol which is a minimum unit of data during communication. Then, RS (Reference Signal) is included in four symbols of symbols constituting one subframe. This RS signal has a waveform shape (also referred to as “pattern”) unique to the Cell-ID to be received. The position of the symbol including the RS in one frame is determined in advance. The RF unit 1 outputs the received signal to the A / D unit 2. The RF unit 1 corresponds to an example of a “signal receiving unit”.

The A / D unit 2 receives the received signal from the RF unit 1. Then, the A / D unit 2 converts the received signal from an analog signal to a digital signal. Thereafter, the A / D unit 2 outputs the received signal converted into the digital signal to the FFT unit 3. Further, the A / D unit 2 outputs the received signal converted into the digital signal to the Cell-ID detection unit 18.

The FFT unit 3 receives the received signal converted into the digital signal from the A / D unit 2. Further, the FFT unit 3 receives the input of the start timing of the radio frame calculated from the previous path timing detection processing from the radio frame start timing calculation unit 15. The path timing detection process by the radio frame head timing calculation unit 15 will be described in detail later. Then, the FFT unit 3 predicts the position of the RS symbol from the head timing of the received radio frame. The FFT unit 3 performs fast Fourier transform on a predetermined range including the expected RS symbol position in the received signal, and converts the received signal, which is a time domain signal, into a frequency domain signal. Then, the FFT unit 3 outputs the received signal converted into the frequency domain signal to the replica correlation unit 4.

The Cell-ID detector 18 receives the received signal converted into a digital signal from the A / D unit 2. Then, the Cell-ID detector 18 detects the Cell-ID indicating the base station that transmitted the received signal from the received signals. Thereafter, the Cell-ID detection unit 18 outputs the detected Cell-ID to the RS replica generation unit 5.

The RS replica generation unit 5 receives the Cell-ID input from the Cell-ID detection unit 18. Then, the RS replica generation unit 5 generates an RS replica that is a replica of the RS having a unique pattern corresponding to the Cell-ID. For example, the RS replica generation unit 5 stores an expression for generating an RS replica in advance, and generates an RS replica according to the expression. In addition, for example, when the RS replica generation unit 5 already has an RS replica corresponding to the Cell-ID of the received signal, the RS replica generation unit 5 may use the RS replica without performing the generation again. . The RS replica generation unit 5 outputs the generated RS replica to the replica correlation unit 4.

The temperature measuring unit 13 measures the temperature around the processor that processes the received signal in the device itself. Then, the temperature measurement unit 13 outputs the measured temperature to the detection window width determination unit 141 and the tracking width determination unit 142 of the detection range determination unit 14.

The detection range determination unit 14 includes a detection window width determination unit 141 and a tracking width determination unit 142. The detection range determination unit 14 stores a table representing the correspondence between the temperature condition, the path timing detection window width, and the path timing tracking width. FIG. 2 is a diagram illustrating an example of a table indicating the correspondence between the temperature condition, the path timing detection window width, and the path timing tracking width. The detection range determination unit 14 stores, for example, a correspondence table 200 as shown in FIG. The correspondence table 200 represents a correspondence table of temperature conditions when the temperature is divided into three stages. Here, the values of the path timing detection window width and the path timing tracking width of the correspondence table 200 represent the number of sampling clocks. In this embodiment, the sampling clock is 30.72 MHz. As shown in the correspondence table 200, as the temperature increases, the path timing detection window width decreases and the path timing tracking width also decreases. Conversely, as the temperature decreases, the path timing detection window width increases and the path timing tracking width also increases. For example, in the case of the terminal internal temperature 201 where the temperature is less than 0 ° C., the path timing detection width 202 is 10 us, and the path timing follow-up width 203 is 3.3 us. In the case of the terminal internal temperature 204 where the temperature is 50 ° C. or higher, the path timing detection width 205 is 3.3 us, and the path timing tracking width 206 is 1.6 us. In FIG. 2, a correspondence table in which the temperature conditions are divided into three stages is shown as an example, but the number of divisions of the temperature conditions may be another number, for example, two stages or four or more stages.

The detection window width determination unit 141 receives a temperature input from the temperature measurement unit 13. Then, the detection window width determination unit 141 refers to the correspondence table stored in the detection range determination unit 14 and acquires the path timing detection window width corresponding to the received temperature. Then, the detection window width determination unit 141 outputs the acquired path timing detection window width to the replica correlation unit 4.

The tracking width determination unit 142 receives a temperature input from the temperature measurement unit 13. Then, the follow-up width determining unit 142 refers to the correspondence table stored in the detection range determining unit 14 and acquires the path timing follow-up width corresponding to the received temperature. Then, the tracking width determination unit 142 outputs the acquired path timing detection window width to the peak detection unit 7.

The RTC 8 is an oscillator that outputs a clock (hereinafter referred to as “real time clock”) generated by a crystal oscillator, for example. The RTC 8 outputs the generated real-time clock to the error measurement unit 10. The RTC 8 continues to operate even when the wireless communication apparatus is in a standby state.

The reception circuit operation clock 9 generates an operation clock for synchronizing the operation with the reception signal in the processing of the reception signal. Then, the reception circuit operation clock 9 outputs the generated operation clock to the error measurement unit 10. The reception circuit operation clock 9 stops generating and outputting clocks when the wireless communication apparatus is in a standby state. The reception circuit operation clock 9 generates and outputs a clock when the wireless communication apparatus recovers from the standby state or when it is an intermittent reception operation for checking whether there is a signal transmitted from the base station in the standby state. .

The error measurement unit 10 receives a real-time clock input from the RTC 8. In addition, the error measurement unit 10 receives an operation clock input from the reception circuit operation clock 9 when the wireless communication apparatus is in an operating state. Then, the error measurement unit 10 measures an error between the real time clock and the operation clock. Next, the error measurement unit 10 outputs the measured error to the peak timing correction unit 11.

The peak timing correction unit 11 receives an error between the real time clock and the operation clock from the error measurement unit 10. The peak timing correction unit 11 holds the newest error among the acquired errors. Further, the peak timing correction unit 11 acquires the previous peak timing from the peak timing holding unit 12.

When the intermittent reception operation is started, the peak timing correction unit 11 is a time from the end timing of the previous intermittent reception operation to the start timing of the current intermittent reception operation (hereinafter referred to as “standby time”). Is obtained from the operating clock. Further, the peak timing correction unit 11 obtains the maximum generated error from the error between the real time clock and the operation clock. The maximum generation error occurs in a state where the temperature is near the maximum temperature among the operating temperatures of the wireless communication device. Next, the peak timing correction unit 11 obtains an error generated between the real time clock and the operation clock within the standby time using the maximum generated error. Then, the peak timing correction unit 11 adds the error generated within the standby time to the standby time to obtain the corrected standby time. Next, the peak timing correction unit 11 adds the standby time corrected with respect to the previous peak timing to obtain the predicted peak timing as the current peak timing.

Thus, the peak timing correction unit 11 predicts the peak timing using an error when the temperature is a high temperature close to the operating temperature limit value of the wireless communication device. Therefore, it is considered that the predicted peak timing is likely to be closer to the actual peak timing as the temperature is higher near the limit value of the operating temperature of the wireless communication device.

The peak timing correction unit 11 outputs the calculated predicted peak timing to the peak timing holding unit 12.

The peak timing holding unit 12 acquires the predicted peak timing obtained by the peak timing correction unit 11. Then, the peak timing holding unit 12 holds the predicted peak timing. Further, the peak timing holding unit 12 acquires the peak timing obtained by the peak detection unit 7. The peak timing holding unit 12 holds the peak timing detected by the peak detection unit 7 as the previous peak timing for use in detection of the next peak timing.

The replica correlation unit 4 receives the input of the received signal converted into the frequency signal from the FFT unit 3. Further, the replica correlation unit 4 receives an RS replica input from the RS replica generation unit 5. Further, the replica correlation unit 4 receives an input of the path timing detection window width from the detection window width determination unit 141. Further, the replica correlation unit 4 acquires the predicted peak timing from the peak timing holding unit 12 when the intermittent reception operation is started in the wireless communication device.

The replica correlation unit 4 extracts a portion in the range of the path timing detection window width around the predicted peak timing from the acquired reception signal. And the replica correlation part 4 performs the correlation calculation process which calculates | requires the correlation with the range which received signal extracted, and RS replica. For example, the replica correlation unit 4 compares the received signal with the RS replica while shifting the position to be compared, and determines how much the received signal and the RS signal are similar at each point. Thereby, the replica correlation part 4 can obtain | require the correlation of the received signal and RS replica in a frequency domain. Then, the replica correlation unit 4 outputs the obtained correlation between the received signal and the RS replica to the IFFT unit 6.

Here, as described above, the higher the temperature, the smaller the path timing detection window width. That is, the replica correlation unit 4 obtains the correlation between the received signal and the RS replica in a smaller range as the temperature is higher. Therefore, the replica correlation unit 4 can reduce the correlation calculation process by reducing the range for obtaining the correlation as the temperature is higher. Therefore, power consumption due to execution of the correlation calculation process can be suppressed. Further, as described above, it is considered that the predicted peak timing is closer to the actual peak timing as the temperature is higher. Therefore, even if the path timing window width is reduced as the temperature increases, the replica correlation unit 4 can obtain the correlation including the peak timing.

The IFFT unit 6 receives an input of the correlation between the received signal and the RS replica from the replica correlation unit 4. Then, the IFFT unit 6 performs inverse fast Fourier transform on the received correlation to obtain a correlation in the time domain between the received signal and the RS replica, and an RS symbol representing the correlation between the received signal and the RS replica. Create a correlation profile. The IFFT unit 6 outputs the correlation profile of the RS symbol to the peak detection unit 7.

The peak detector 7 receives an RS symbol correlation profile from the IFFT unit 6. Further, the peak detection unit 7 receives the input of the path timing tracking width from the tracking width determination unit 142. Furthermore, when the wireless communication apparatus starts the intermittent reception operation, the peak detection unit 7 acquires the predicted peak timing from the peak timing holding unit 12.

When the intermittent reception operation is started in the wireless communication device, the peak detection unit 7 specifies the position of the predicted peak timing in the correlation profile of the received RS symbol. Furthermore, the peak detection unit 7 specifies a correlation peak in the correlation profile of the RS symbol. The correlation peak is a position where the correlation between the received signal and the RS replica is the largest, in other words, a place where the received signal and the RS replica are most similar. That is, it is estimated that the timing at which the correlation peak occurs is the RS timing in the frame.

The peak detector 7 determines whether or not the correlation peak is within the range of the path timing tracking width from the position of the predicted peak timing.

If the correlation peak is in the range of the path timing tracking width from the position of the predicted peak timing, the peak detector 7 detects the timing of the correlation peak as the RS timing. The peak detector 7 then outputs the detected RS timing to the radio frame head timing calculator 15. Then, the peak detector 7 outputs the RS timing to the peak timing holding unit 12 as the peak timing.

On the other hand, if the correlation peak is not in the range of the path timing tracking width from the position of the predicted peak timing, the peak detection unit 7 outputs the limit timing of the path timing tracking width to the peak timing holding unit 12 as the peak timing. . In this case, the peak detector 7 cannot detect the correlation peak, and therefore does not output the RS timing to the radio frame head timing calculator 15.

Here, as described above, the path timing tracking width decreases as the temperature increases. That is, the peak detection unit 7 follows only to a smaller range as the temperature is higher. Conversely, when the temperature is low, the peak detector 7 follows up to a larger range. Therefore, when the temperature is low and the window width is large, the peak detection unit 7 can detect a far peak by increasing the tracking range. Therefore, even when the temperature is low, accurate timing can be detected quickly.

The radio frame head timing calculation unit 15 receives an RS timing input from the peak detection unit 7. Next, the radio frame head timing calculation unit 15 calculates the head timing of the frame from the position in the RS frame having the received timing. Then, the radio frame head timing calculation unit 15 outputs the calculated timing of the head of the frame to the signal processing unit 16.

The peak detection unit 7 or a combination of the peak detection unit 7 and the radio frame head timing calculation unit 15 corresponds to an example of a “synchronization detection unit”.

The signal processing unit 16 receives an input of the start timing of the frame from the radio frame start timing calculation unit 15. Further, the signal processing unit 16 receives an input of a reception signal received by the RF unit 1 from the RF unit 1. Then, the signal processing unit 16 processes the received signal after synchronizing with the received signal using the clock received from the receiving circuit operation clock 9 on the basis of the timing of the head of the received frame.

Next, the flow of the path timing detection process when the temperature condition is divided into two stages will be described with reference to FIG. FIG. 3 is a flowchart of the path timing detection process when the temperature condition is divided into two stages. Here, when the temperature condition is high, a path timing detection window width “small” which is a predetermined value and a path timing follow-up width “small” which is a predetermined value are used. In the case of a low temperature condition, a path timing detection window width “large” that is a predetermined value and a path timing follow-up width “large” that is a predetermined value are used.

The temperature measuring unit 13 measures the temperature inside the wireless terminal device (step S101). Then, the temperature measurement unit 13 outputs the measured temperature to the detection window width determination unit 141 and the tracking width determination unit 142.

The detection window width determination unit 141 and the tracking width determination unit 142 determine whether the temperature is equal to or higher than a threshold value (step S102). When the temperature is equal to or higher than the threshold (step S102: affirmative), the detection window width determining unit 141 sets the path timing detection window width to “small” (step S103). Further, the tracking width determination unit 142 sets the path timing tracking width to “small” (step S104).

On the other hand, when the temperature is lower than the threshold (No at Step S102), the detection window width determining unit 141 sets the path timing detection window width to “large” (Step S105). Furthermore, the tracking width determination unit 142 sets the path timing tracking width to “large” (step S106).

The RF unit 1 receives a radio signal (step S107).

The RS replica generation unit 5 acquires the Cell-ID from the Cell-ID detection unit 18 and generates an RS replica having an RS pattern unique to the Cell-ID (step S108).

The replica correlation unit 4 extracts a portion in the range of the path timing detection window width around the predicted peak timing acquired from the peak timing holding unit 12 or the current peak timing. And the replica correlation part 4 acquires a correlation by performing the correlation calculation with the extracted received signal and RS replica (step S109).

The peak detector 7 detects a correlation peak from the correlation between the received signal converted into the time domain by the IFFT unit 6 and the RS replica (step S110).

The peak detector 7 determines whether or not the detected correlation peak is within the range of the path timing tracking width from the reference peak timing (step S111). When it is within the range of the path timing tracking width (step S111: affirmative), the peak detector 7 outputs the detected correlation peak timing to the radio frame head timing calculator 15 as the RS timing. The radio frame start timing calculation unit 15 calculates the start timing of the frame using the received RS timing (step S112).

On the other hand, if it is not within the range of the path timing follow-up width (No at Step S111), the peak detector 7 proceeds to Step S113.

When there is a correlation peak in the range of the path timing tracking width, the peak detection unit 7 outputs the correlation peak timing to the peak timing holding unit 12 as the peak timing. If there is no correlation peak in the range of the path timing tracking width, the peak detection unit 7 outputs the limit timing of the path timing tracking width when tracking is performed to the peak timing holding unit 12 as the peak timing. The peak timing holding unit 12 updates the held peak timing to the received peak timing (step S113).

Next, the flow of the path timing detection process when the temperature condition is divided into three stages will be described with reference to FIG. FIG. 4 is a flowchart of the path timing detection process when the temperature condition is divided into three stages. Here, the temperature condition equal to or higher than the first threshold is the highest temperature condition, the temperature condition lower than the first threshold is equal to or higher than the second threshold, the temperature is intermediate, and the temperature condition lower than the second threshold is the highest. Use low temperature conditions. When the temperature condition is the highest, a path timing detection window width “small” that is a predetermined value and a path timing tracking width “small” that is a predetermined value are used. When the temperature condition is the lowest, a path timing detection window width “large” that is a predetermined value and a path timing tracking width “large” that is a predetermined value are used. Further, when the temperature is an intermediate temperature condition, a path timing detection window width “medium” that is a predetermined value and a path timing follow-up width “medium” that is a predetermined value are used.

The temperature measuring unit 13 measures the temperature inside the wireless terminal device (step S201). Then, the temperature measurement unit 13 outputs the measured temperature to the detection window width determination unit 141 and the tracking width determination unit 142.

The detection window width determination unit 141 and the tracking width determination unit 142 determine whether the temperature is equal to or higher than the first threshold (step S202). When the temperature is equal to or higher than the first threshold (step S202: affirmative), the detection window width determining unit 141 sets the path timing detection window width to “small” (step S203). Further, the tracking width determination unit 142 sets the path timing tracking width to “small” (step S204).

On the other hand, when the temperature is lower than the first threshold (No at Step S202), the detection window width determining unit 141 and the tracking width determining unit 142 determine whether the temperature is equal to or higher than the second threshold (Step S205). . When the temperature is equal to or higher than the second threshold (step S205: Yes), the detection window width determination unit 141 sets the path timing detection window width to “medium” (step S206). Further, the tracking width determination unit 142 sets the path timing tracking width to “medium” (step S207).

On the other hand, when the temperature is lower than the second threshold (No at Step S205), the detection window width determination unit 141 and the tracking width determination unit 142 set the path timing detection window width to “large” (Step S208). . Further, the tracking width determination unit 142 sets the path timing tracking width to “large” (step S209).

The RF unit 1 receives a radio signal (step S210).

The RS replica generation unit 5 acquires the Cell-ID from the Cell-ID detection unit 18 and generates an RS replica having an RS pattern specific to the Cell-ID (step S211).

The replica correlation unit 4 extracts a portion in the range of the path timing detection window width around the predicted peak timing acquired from the peak timing holding unit 12 or the current peak timing. And the replica correlation part 4 acquires a correlation by performing the correlation calculation with the extracted received signal and RS replica (step S212).

The peak detector 7 detects a correlation peak from the correlation between the received signal converted into the time domain by the IFFT unit 6 and the RS replica (step S213).

The peak detector 7 determines whether or not the detected correlation peak is within the range of the path timing tracking width from the reference peak timing (step S214). When it is within the range of the path timing tracking width (step S214: affirmative), the peak detector 7 outputs the detected correlation peak timing to the radio frame head timing calculator 15 as the RS timing. The radio frame start timing calculation unit 15 calculates the start timing of the frame using the received RS timing (step S215).

On the other hand, when it is not within the range of the path timing follow-up width (No at Step S214), the peak detector 7 proceeds to Step S216.

When there is a correlation peak in the range of the path timing tracking width, the peak detection unit 7 outputs the correlation peak timing to the peak timing holding unit 12 as the peak timing. If there is no correlation peak in the range of the path timing tracking width, the peak detection unit 7 outputs the limit timing of the path timing tracking width when tracking is performed to the peak timing holding unit 12 as the peak timing. The peak timing holding unit 12 updates the held peak timing to the received peak timing (step S216).

[Hardware configuration]
Next, the hardware configuration of the wireless communication apparatus according to the present embodiment will be described with reference to FIG. FIG. 5 is a hardware configuration diagram of the wireless communication apparatus according to the first embodiment.

The wireless communication apparatus according to the first embodiment includes an antenna 301, a UIM (User Identity Medium) 302, a wireless communication unit 303, an A / D converter 304, and a temperature sensor 305. The wireless communication apparatus also includes a baseband processor 306, an application processor 307, a multimedia processor 308, a sound source 309, a 3D (3 Dimension) engine 310, and a moving image codec 311. Further, the wireless communication apparatus includes a ROM (Read Only Memory) 312, a RAM (Random Access Memory) 313, a camera 314, an LCD (Liquid Crystal Display) 315, and a power source 316.

The antenna 301 is connected to the wireless communication unit 303. The wireless communication unit 303 is connected to the baseband processor 306 via the A / D converter 304. Further, the temperature sensor 305 is connected to the baseband processor 306. The camera 314 and the LCD 315 are connected to the multimedia processor 308. In addition, the baseband processor 306, the application processor 307, the multimedia processor 308, the sound source 309, the 3D engine 310, and the moving image codec 311 are connected to each other. The ROM 312 and the RAM 313 are connected to the baseband processor 306, the application processor 307, the multimedia processor 308, the sound source 309, the 3D engine 310, and the moving image codec 311, respectively. However, in the figure, only the connection to the application processor 307 is described as the connection of the ROM 312 and the RAM 313 as a representative.

In addition, the power source 316 supplies power to each internal part surrounded by a dotted line.

The multimedia processor 308 reproduces or records the image received from the camera 314 in cooperation with the sound source 309, the 3D engine 310, the moving image codec 311 and the like. In addition, the application processor 307 performs processing of the operation of the designated application.

And the function of the RF unit 1 in FIG. 1 is realized by the wireless communication unit 303. Further, the function of the A / D unit 2 in FIG. 1 is realized by the A / D converter 304.

Further, the temperature sensor 305 is disposed in the vicinity of the baseband processor 306. And the function of the temperature measurement part 13 in FIG. 1 is implement | achieved by the temperature sensor 305. FIG.

Further, the functions of the FFT unit 3 to the signal processing unit 16 in FIG. 1 are realized by the baseband processor 306, the ROM 312 and the RAM 313. For example, the RAM 313 stores various programs for realizing the functions of the FFT unit 3 to the signal processing unit 16. Then, the baseband processor 306 reads a program stored in the RAM 313, develops it in the RAM 313, and processes a process for realizing the functions of the FFT unit 3 to the signal processing unit 16.

As described above, the wireless communication apparatus according to the present embodiment reduces the detection window width when the temperature inside the apparatus is high, and increases the detection window width when the temperature is low. In contrast, conventionally, a large detection window width in this embodiment is used at any temperature. For this reason, when the temperature is high, the wireless communication apparatus according to the present embodiment can reduce the correlation calculation process compared to the conventional case, and can suppress the overall power consumption.

In addition, the wireless communication device according to the present embodiment reduces the tracking width when the temperature inside the device is high, and increases the tracking width when the temperature inside the device is low. As a result, even when the correlation peak is far away in a state where the temperature is low, the correlation peak can be followed once, and accurate peak timing detection can be performed quickly.

FIG. 6 is a block diagram of the wireless communication apparatus according to the second embodiment. FIG. 6 shows a configuration in which an SNR measuring unit 17 is added to the wireless communication apparatus according to the first embodiment shown in FIG. The wireless communication apparatus according to the present embodiment is different from the first embodiment in that the SNR value is used in addition to the temperature in the apparatus for determining the path timing detection width and the path timing tracking width. Therefore, in the following, the determination of the path timing detection width and the path timing tracking width will be mainly described. In FIG. 6, each part having the same reference numeral as in FIG. 1 has the same function unless otherwise specified.

The SNR measurement unit 17 measures the SNR (signal to noise ratio) of the received signal. Then, the SNR measurement unit 17 outputs the measured SNR value to the detection window width determination unit 141 and the tracking width determination unit 142.

In the present embodiment, the detection range determination unit 14 stores a correspondence table in which a path timing detection window width and a path timing tracking width are associated with a combination of temperature and SNR. In this embodiment, in the correspondence table, when the temperature condition is equal to or greater than a predetermined threshold, the path timing detection window width corresponds to “small” and the path timing tracking width corresponds to “small”. When the temperature condition is less than a predetermined threshold and the SNR value is less than the predetermined threshold, the path timing detection window width corresponds to “small” and the path timing tracking width corresponds to “small”. is doing. Furthermore, if the temperature condition is less than a predetermined threshold and the SNR value is greater than or equal to the predetermined threshold, the path timing detection window width corresponds to “large” and the path timing tracking width corresponds to “large”. is doing.

This is due to the following reasons. First, when the temperature is high, as described above, the actual RS is in a position near the predicted peak. Therefore, when the temperature is high, the path timing detection window width may be reduced, and the path timing tracking width may also be reduced. On the other hand, when the temperature is low, the actual RS is far from the predicted peak. Therefore, it is better to increase the path timing detection window width and increase the path timing tracking width. However, when the SNR value is small, there is a lot of noise, so the actual RS waveform is buried in the noise, and the peak detector 7 may erroneously detect a peak that is different from the actual RS. High nature. Therefore, when the SNR value is small, it is better to reduce the path timing detection window width and the path timing tracking width. On the other hand, when the SNR value is large, the possibility of false detection of the peak is low, so the path timing detection window width is increased and the path timing follow-up width is set so that a distant peak can be detected quickly. Should be larger. For this reason, the correspondence table in this embodiment is determined.

The detection window width determination unit 141 and the tracking width determination unit 142 receive an input of the temperature in the apparatus from the temperature measurement unit 13. In addition, the detection window width determination unit 141 and the tracking width determination unit 142 receive an input of the SNR value from the SNR measurement unit 17.

The detection window width determination unit 141 refers to the correspondence table stored in the detection range determination unit 14, and determines the path timing detection window width corresponding to the received temperature and SNR values. Specifically, the detection window width determination unit 141 determines the path timing detection window width to be “small” when the temperature is higher than the threshold value. The detection window width determination unit 141 determines the path timing detection window width to be “small” if the temperature is lower than the threshold value and the SNR value is less than the threshold value. On the other hand, if the temperature is lower than the threshold and the SNR value is equal to or greater than the threshold, the detection window width determination unit 141 determines the path timing detection window width to be “large”.

The follow-up width determining unit 142 refers to the correspondence table stored in the detection range determining unit 14 and determines the path timing follow-up width corresponding to the received temperature and SNR values. Specifically, the tracking width determination unit 142 determines the path timing tracking width to be “small” when the temperature is higher than the threshold value. If the temperature is lower than the threshold and the SNR value is less than the threshold, the tracking width determination unit 142 determines the path timing tracking width to be “small”. On the other hand, if the temperature is lower than the threshold and the SNR value is equal to or greater than the threshold, the tracking width determination unit 142 determines the path timing tracking width to be “large”.

Next, the flow of path timing detection processing of the wireless communication apparatus according to the present embodiment will be described with reference to FIG. FIG. 7 is a flowchart of a path timing detection process of the wireless communication apparatus according to the second embodiment.

The temperature measurement unit 13 measures the temperature inside the wireless terminal device (step S301). Then, the temperature measurement unit 13 outputs the measured temperature to the detection window width determination unit 141 and the tracking width determination unit 142.

The detection window width determination unit 141 and the tracking width determination unit 142 determine whether the temperature is equal to or higher than a threshold value (step S302). When the temperature is equal to or higher than the threshold (step S302: Yes), the detection window width determination unit 141 sets the path timing detection window width to “small” (step S304). Further, the tracking width determination unit 142 sets the path timing tracking width to “small” (step S305).

On the other hand, when the temperature is lower than the threshold value (No at Step S302), the detection window width determining unit 141 and the tracking width determining unit 142 determine whether or not the SNR is equal to or greater than the threshold value (Step S303). When the SNR is less than the threshold (No at Step S303), the detection window width determining unit 141 sets the path timing detection window width to “small” (Step S304). Further, the tracking width determination unit 142 sets the path timing tracking width to “small” (step S305).

On the other hand, when the temperature is equal to or higher than the threshold (step S303: affirmative), the detection window width determination unit 141 sets the path timing detection window width to “large” (step S306). Further, the tracking width determination unit 142 sets the path timing tracking width to “large” (step S307).

The RF unit 1 receives a radio signal (step S308).

The RS replica generation unit 5 acquires the Cell-ID from the Cell-ID detection unit 18 and generates an RS replica having an RS pattern specific to the Cell-ID (step S309).

The replica correlation unit 4 extracts a portion in the range of the path timing detection window width around the predicted peak timing acquired from the peak timing holding unit 12 or the current peak timing. And the replica correlation part 4 acquires a correlation by performing the correlation calculation with the extracted received signal and RS replica (step S310).

The peak detector 7 detects a correlation peak from the correlation between the received signal converted into the time domain by the IFFT unit 6 and the RS replica (step S311).

The peak detector 7 determines whether or not the detected correlation peak is within the range of the path timing tracking width from the reference peak timing (step S312). When it is within the range of the path timing tracking width (step S312: affirmative), the peak detector 7 outputs the detected correlation peak timing to the radio frame head timing calculator 15 as the RS timing. The radio frame start timing calculation unit 15 calculates the start timing of the frame using the received RS timing (step S313).

On the other hand, when it is not within the range of the path timing follow-up width (No at Step S312), the peak detector 7 proceeds to Step S314.

When there is a correlation peak in the range of the path timing tracking width, the peak detection unit 7 outputs the correlation peak timing to the peak timing holding unit 12 as the peak timing. If there is no correlation peak in the range of the path timing tracking width, the peak detection unit 7 outputs the limit timing of the path timing tracking width when tracking is performed to the peak timing holding unit 12 as the peak timing. The peak timing holding unit 12 updates the held peak timing to the received peak timing (step S314).

FIG. 8 is a diagram for explaining the detection of the correlation peak timing in the intermittent reception by the wireless communication apparatus according to the second embodiment. Here, with reference to FIG. 8, the detection of the correlation peak in the intermittent reception by the wireless communication apparatus according to the present embodiment will be described again. FIG. 8 shows that time has passed in the right direction toward the page.

A frame 411 represents a frame of a signal transmitted from the base station. In this embodiment, the frame 411 is one frame in 10 ms. A graph 412 shows the timing of intermittent reception. The portion of the graph 412 that rises upward toward the paper surface represents the intermittent reception timing. Further, the second column from the bottom toward the page represents the correlation peak detection process when the temperature in the apparatus is low and the SNR is high, that is, when the SNR value is large. Further, the bottom row toward the paper surface represents a correlation peak detection process when the temperature in the apparatus is high and the SNR is low, that is, when the SNR value is small.

Correlation peak detection processing 420 represents detection of a correlation peak in the first intermittent reception. A correlation peak detection process 430 represents detection of a correlation peak in the next intermittent reception of the correlation peak detection process 420. The correlation peak detection process 440 represents detection of a correlation peak in the next intermittent reception after the correlation peak detection process 430. The correlation peak detection process 450 represents detection of a correlation peak in the next intermittent reception after the correlation peak detection process 440. Here, in correlation peak detection processing 420, it is assumed that a correlation peak is detected at a position that matches the actual RS timing in both cases of high SNR and low SNR.

First, correlation peak detection processing in the case where the temperature in the apparatus is low and the SNR is high, which is represented in the second column from the bottom toward the paper surface, will be described. The timing 421 is the position of the correlation peak that is detected in the correlation peak detection process 420 and is a correct peak that matches the RS timing.

Next, in the case of the correlation peak detection processing 430, the predicted peak timing 432 deviates greatly from the correct peak timing 431. However, since the tracking width is large, the peak detection unit 7 can largely follow the correct peak timing 431 like the tracking 433. Therefore, the peak detector 7 can detect the correct peak timing 431 by one follow-up.

Next, in the case of the correlation peak detection process 440, the operation is the same as the case of the correlation peak detection process 430. That is, the predicted peak timing 442 deviates greatly from the correct peak timing 441. However, since the tracking width is large, the peak detection unit 7 can largely follow the correct peak timing 441 like the tracking 443. Therefore, the peak detector 7 can detect the correct peak timing 441 by one follow-up.

Next, in the case of the correlation peak detection process 450, the operation is the same as in the case of the correlation peak detection process 430. That is, the predicted peak timing 452 deviates greatly from the correct peak timing 451. However, since the tracking width is large, the peak detection unit 7 can largely follow the correct peak timing 451 like the tracking 453. Therefore, the peak detector 7 can detect the correct peak timing 451 by one follow-up.

As described above, even when the temperature in the apparatus is low, if the SNR is high, the correct peak timing can be quickly detected by using a large path timing tracking width.

Next, the correlation peak detection process in the case where the temperature inside the apparatus is high and the SNR is low, which is represented in the bottom row toward the paper surface, will be described. The timing 422 is the position of the correlation peak that is a correct peak that matches the RS timing and is detected in the correlation peak detection process 420 when the temperature in the apparatus is high and the SNR is low.

Next, in the correlation peak detection process 430, the predicted peak timing 435 is small from the correct peak 434 timing. Here, the peak 434 indicates the correct peak position. However, the RS peak waveform is buried in the noise, and the peak detector 7 erroneously detects the peak 437 as a correlation peak representing RS. In this case, the peak detection unit 7 performs tracking in the range of the path timing tracking width in the direction of the detected peak 437. However, since the path timing tracking width is small, the peak detector 7 ends the tracking at the position of the timing 436 before reaching the peak 437.

Next, in the correlation peak detection process 440, the predicted peak timing 444 is slightly shifted from the correct peak 434 timing than in the correlation peak detection process 430. Further, in this case as well, the waveform of the RS peak is buried in the noise, and the peak detector 7 erroneously detects the peak 446 as a correlation peak representing RS. In this case, the peak detection unit 7 performs tracking in the range of the path timing tracking width in the direction of the detected peak 446. However, since the path timing tracking width is small, the peak detector 7 ends the tracking at the position of the timing 445 before reaching the peak 446.

Next, in the correlation peak detection processing 450, as shown in the figure, since the position of the predicted peak timing is not so deviated from the correct peak position, the correct peak 434 is still within the detection window width. Therefore, the peak detector 7 can detect the correct peak 434 as a correlation peak. For example, when the state shifts to a high SNR in this state, the peak detector 7 can appropriately follow the correct peak 434, and can return to a state in which the correct peak position is detected as a correlation peak.

Here, conventionally, in a wireless communication device, a path timing tracking width considering a maximum error is used regardless of the magnitude of SNR (Signal Noise Ratio). Therefore, under conditions where there is a lot of noise, such as at low SNR, and it is difficult to detect the RS waveform, the radio communication device erroneously matches the waveform with the RS replica at a location far away from the reference RS timing. May be detected. When such a state in which a large follow-up to the erroneously detected timing occurs is continued by several intermittent receptions, after the correct RS timing exceeds the detectable range and returns to the high SNR state. May not be able to follow the correct RS timing.

On the other hand, as described above, the radio communication apparatus according to the present embodiment follows largely when the temperature in the apparatus is low, when the SNR value is large, and when the SNR value is small. Follow small. For this reason, the wireless communication apparatus according to the present embodiment can quickly detect a correct correlation peak as long as the SNR value is large and detection can be performed accurately. In addition, the wireless communication apparatus according to the present embodiment can reduce the false detection and improve the probability of returning to the correct peak if the SNR value is small and it is difficult to perform the detection accurately. The probability of executing accurate path timing tracking can be improved.

1 RF unit 2 A / D unit 3 FFT unit 4 Replica correlation unit 5 RS replica generation unit 6 IFFT unit 7 Peak detection unit 8 RTC
DESCRIPTION OF SYMBOLS 9 Reception circuit operation clock 10 Error measurement part 11 Peak timing correction part 12 Peak timing holding part 13 Temperature measurement part 14 Detection range determination part 15 Radio frame head timing calculation part 16 Signal processing part 17 SNR measurement part

Claims

A signal receiving unit for receiving a radio signal, including a known synchronization signal for synchronizing the operation of the receiving circuit;
A replica generator for generating a replica of the synchronization signal;
A temperature measuring unit for measuring the temperature inside the device,
Based on the temperature measured by the temperature measurement unit, a detection range determination unit that determines a detection range for detecting the position of the synchronization signal in the radio signal received by the signal reception unit;
In the detection range determined by the detection range determination unit in the wireless signal, a synchronization detection unit that detects a synchronization timing based on a correlation peak obtained by a correlation calculation between the replica of the synchronization signal and the wireless signal;
A wireless communication apparatus comprising: a signal processing unit that processes the wireless signal based on the synchronization timing detected by the synchronization detection unit.
The detection range determination unit determines a detection window width indicating a range to be subjected to correlation calculation by the synchronization detection unit based on the temperature measured by the temperature measurement unit,
The synchronization detection unit is configured to correlate by performing a correlation operation between a replica of the synchronization signal generated by the replica generation unit and the radio signal in a detection window width range determined by the detection range determination unit in the radio signal. The wireless communication apparatus according to claim 1, wherein:
When the temperature measured by the temperature measurement unit is equal to or greater than a predetermined value, the detection range determination unit sets the detection window width as a first window width, and when the temperature measured by the temperature measurement unit is less than a predetermined value, The wireless communication apparatus according to claim 2, wherein the detection window width is a second window width having a width larger than the first window width.
When the temperature measured by the temperature measurement unit is equal to or greater than a first predetermined value, the detection range determination unit sets the detection window width as a first window width, and the temperature measured by the temperature measurement unit is a first predetermined value. Less than a second predetermined value, the detection window width is a second window width larger than the first window width, and the temperature measured by the temperature measurement unit is less than a second predetermined value The wireless communication apparatus according to claim 2, wherein the detection window width is a third window width having a width larger than the second window width.
The detection range determination unit determines a tracking width used for controlling whether or not to use the timing of the correlation peak as a synchronization timing based on the temperature measured by the temperature measurement unit,
The synchronization detection unit detects the timing of the correlation peak as the timing of the synchronization signal in the radio signal if the obtained correlation peak is within the range of the tracking width determined by the tracking width determination unit. The wireless communication device according to any one of claims 1 to 4, wherein the wireless communication device is characterized in that:
When the temperature measured by the temperature measurement unit is equal to or greater than a predetermined value, the detection range determination unit sets the tracking width as a first tracking width, and when the temperature measured by the temperature measurement unit is less than a predetermined value, 6. The wireless communication apparatus according to claim 5, wherein the tracking width is a second tracking width having a width larger than the first tracking width.
An SNR measuring unit for detecting the SNR;
The detection range determination unit, based on the temperature measured by the temperature measurement unit and the SNR value measured by the SNR measurement unit, a detection window width indicating a range subject to correlation calculation by the synchronization detection unit, Determine the tracking width used for controlling whether to use the timing of the correlation peak as the synchronization timing,
The synchronization detection unit detects the timing of the correlation peak as the timing of the synchronization signal in the radio signal if the calculated correlation peak exists between the tracking widths determined by the detection range determination unit. The wireless communication apparatus according to claim 2.
The detection range determination unit is detected by the SNR measurement unit when the temperature measured by the temperature measurement unit is equal to or higher than a predetermined temperature, and the temperature measured by the temperature measurement unit is lower than a predetermined temperature. When the SNR value is less than a predetermined SNR value, the detection window width is the first window width, the tracking width is the first tracking width, and the temperature measured by the temperature measurement unit is less than the predetermined temperature, When the SNR value detected by the SNR detector is equal to or greater than a predetermined SNR value, the detection window width is set to a second window width larger than the first window width, and the follow width is larger than the first follow width. The wireless communication apparatus according to claim 7, wherein the second tracking width is set.
A reference acquisition unit for obtaining a reference timing serving as a reference for detection of the synchronization signal in the signal received by the signal reception unit based on an operation error between the real-time clock and the reception circuit operation clock;
The synchronization detection unit is generated by the replica generation unit in a detection window width range determined by the detection range determination unit centered on the reference timing obtained by the reference acquisition unit in the radio signal. The wireless communication apparatus according to claim 2, wherein a correlation is obtained by a correlation operation between a replica of a synchronization signal and the wireless signal.
A reference acquisition unit for obtaining a reference timing serving as a reference for detection of the synchronization signal in the signal received by the signal reception unit based on an operation error between the real-time clock and the reception circuit operation clock;
The synchronization detection unit detects the timing of the correlation peak as the timing of the synchronization signal in the received signal if the obtained correlation peak exists in a range from the reference timing to the tracking width. Item 6. The wireless communication device according to Item 5.
The wireless communication device according to claim 1, wherein the temperature measuring unit measures a temperature in the vicinity of the synchronization detecting unit.
Receiving a radio signal including a synchronization signal having a unique waveform shape for synchronizing the operation of the receiving circuit;
Generating a replica of the synchronization signal;
Measuring the temperature inside the wireless communication device;
Based on the measured temperature, determine a detection range for detecting the position of the synchronization signal in the received radio signal,
In the detection range determined in the radio signal, the synchronization timing is detected based on the correlation peak obtained by the correlation calculation between the replica of the synchronization signal and the radio signal,
A wireless communication apparatus control method, comprising: causing a wireless communication apparatus to execute a process of processing the wireless signal based on a detected synchronization timing.