WO2002100123A1 - Appareil de communication radio et procede d'estimation de temps de reception associe - Google Patents
Appareil de communication radio et procede d'estimation de temps de reception associe Download PDFInfo
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- WO2002100123A1 WO2002100123A1 PCT/JP2002/005440 JP0205440W WO02100123A1 WO 2002100123 A1 WO2002100123 A1 WO 2002100123A1 JP 0205440 W JP0205440 W JP 0205440W WO 02100123 A1 WO02100123 A1 WO 02100123A1
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- timing
- frequency deviation
- clock signal
- measurement time
- signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
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- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G3/00—Producing timing pulses
- G04G3/02—Circuits for deriving low frequency timing pulses from pulses of higher frequency
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
- H04W52/0287—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level changing the clock frequency of a controller in the equipment
- H04W52/029—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level changing the clock frequency of a controller in the equipment reducing the clock frequency of the controller
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a radio communication apparatus for estimating the reception timing of a radio signal in a radio communication system in which a radio signal is intermittently transmitted at predetermined time intervals, and to a method for estimating the reception timing.
- a method of intermittently transmitting a control signal such as system broadcast information or incoming call notification information to a terminal device at predetermined time intervals has been widely adopted.
- a terminal device of such a wireless communication system for example, a low-speed clock oscillator with low power consumption and a low oscillation frequency, such as RTC (Real Time Clock), and a high-frequency frequency, such as T CXO, A high-speed clock oscillator having high stability accuracy; measuring a transmission time interval of the control signal based on an output of the low-speed clock oscillator to estimate a reception timing; The high-speed oscillator is operated only in the vicinity of the timing, and reception processing of the control signal transmitted intermittently is performed.
- RTC Real Time Clock
- a high-speed clock oscillator that consumes a large amount of power is operated intermittently in synchronization with the transmission of a control signal, thereby reducing the power consumption of the terminal device in an incoming call waiting state or the like. It is planned.
- the low-speed clock oscillator used for estimating the reception timing is selected to have a low power consumption and a low frequency.
- such an oscillator has a frequency deviation of about 100 ppm.
- the high speed Compared to the frequency deviation of lock oscillator (several ppm), the frequency stability accuracy is much lower. Therefore, in order to accurately estimate the reception timing of the control signal based on the output of the low-speed clock oscillator, the frequency deviation of the low-speed clock oscillator is measured in advance, and the frequency deviation is corrected. It is necessary to estimate the reception timing based on the low-speed cook signal after the deviation correction.
- FIG. 1 is a configuration diagram of a terminal device to which a conventional method of estimating a frequency deviation of a low-speed clock disclosed in Japanese Patent Application Laid-Open No. 2000-132296, for example, is applied. Hereinafter, the operation of the conventional terminal device will be described.
- the operation clock signal 102 output from the high-speed clock oscillator 1 and having a high frequency and a small frequency deviation is input to the timing control unit 103 and is not shown in FIG.
- the signal is supplied to another reception signal processing unit and used for signal reception processing.
- the low-speed clock oscillator 2 outputs a timing clock signal 109 having a low frequency and a large frequency deviation.
- the PLL 104 receives the operation clock signal 102 and outputs the same at a predetermined magnification.
- the delay measurement clock signal 105 subjected to the delay multiplication is output.
- the measurement time control counter 11010 responds to the deviation measurement force signal 106. Instructs to start counting the number of clocks of the deviation measurement clock signal 105. At the same time, the measurement time control counter 110 starts counting the number of clocks of the timing clock signal 109. In the measurement time control count 110, the number of clocks of the evening clock signal 109 that defines the frequency deviation measurement time (hereinafter, the number of deviation measurement clocks) is set in advance.
- the number of deviation measurement clocks is the desired measurement as the frequency deviation measurement result. It is set so that constant accuracy is obtained.
- timing clock signal For example, timing clock signal
- the frequency deviation measurement time defined by the period of the timing clock signal 109 and the number of deviation measurement clocks is required.
- the appropriate number of deviation measurement clocks is set so as to be 100,000 times the cycle of the deviation measurement clock signal 105.
- the frequency deviation measurement time can be shortened by increasing the multiplier multiple of the PLL 104.
- the power consumption of the PLL 104 increases in accordance with the multiple of the deviation measurement cook signal 105.
- the measurement time control counter 110 sets the deviation relative to the deviation measurement count 106. Instructs to stop counting the number of clocks of measurement clock signal 105, and notifies completion of frequency deviation measurement to evening control unit 103.
- the timing control unit 103 reads the count value of the deviation measurement clock signal 105 of the deviation measurement counter 106, and based on the count value, determines the timing clock. Calculate the frequency deviation 1 15 of the signal 1 09.
- the calculated frequency deviation 115 of the timing clock signal 109 is supplied to the return counter 114 for generating the estimated reception timing, and the timing deviation of the timing clock signal 109 is generated. Used to correct frequency deviation.
- the deviation measurement clock signal 1 obtained by multiplying the operation clock signal 102 by the PLL 104 is used.
- the frequency deviation of the timing clock signal 109 is detected. Therefore, the operation clock It is necessary to configure the PLL 104 for the multiplication processing of the peak signal 102, and thus there is a problem that the circuit scale is increased and power consumption is increased due to frequency deviation measurement.
- the present invention has been made to solve the above-described problems, and suppresses an increase in power consumption while measuring a frequency deviation of a timing clock signal used for generating an estimated reception timing with high accuracy. It is another object of the present invention to provide a wireless communication device capable of accurately estimating the reception timing of a wireless signal transmitted intermittently and a method of estimating the reception timing. Disclosure of the invention
- a wireless communication apparatus determines a deviation measurement time for measuring a frequency deviation of a timing clock signal having a low frequency and low frequency stability accuracy according to an intermittent time interval length of a radio signal to be received.
- the configuration is such that
- the deviation measurement time is set to be long, and the frequency deviation measurement of the timing clock signal is performed.
- the resolution can be increased, and as a result, there is an effect that the frequency of the evening clock signal is subjected to frequency correction processing based on the measured frequency deviation, and the estimation accuracy of the reception timing of the radio signal can be increased.
- the deviation measurement time is set short to perform the timing deviation measurement processing of the timing clock signal. The effect is that the increase in power consumption can be suppressed.
- a wireless communication device includes a reception timing detection unit that detects reception timing of a radio signal, and the frequency deviation measurement time control unit includes a reception timing detection unit. Detects an estimation error between the estimated reception timing generated by the timer and the reception timing of the radio signal, and determines a deviation measurement time used in the subsequent frequency deviation measurement according to the estimation error. It has such a configuration.
- the timing deviation measurement time is extended by extending the timing deviation measurement time of the timing clock signal. This has the effect of increasing the resolution of the frequency deviation measurement, and as a result, performing frequency correction processing on the timing clock signal based on the measured frequency deviation, thereby increasing the accuracy of estimating the reception timing of the radio signal.
- the frequency deviation measurement time control unit stores in advance a permissible maximum value of the estimation error of the reception timing, and calculates the number of continuous receptions of the radio signal whose estimation error is larger than the permissible maximum value.
- the configuration is such that the measurement is started and the frequency deviation measurement processing of the timing clock signal is started when the number of continuous receptions exceeds a predetermined threshold.
- the timing deviation measurement processing of the timing clock signal is not performed immediately, and the timing clock signal is not measured.
- the frequency deviation of the timing clock signal is automatically measured only when it is determined that the intermittent reception of the radio signal has become difficult over a long period of time due to fluctuations in the frequency accuracy of the signal. There is an effect that an increase in power consumption required for the deviation measurement can be suppressed.
- the frequency deviation measurement time control unit counts the number of continuous receptions of the wireless signal having the estimation error larger than the allowable maximum value, and the power point value becomes equal to or larger than the predetermined threshold.
- the frequency deviation measurement time of the timing clock signal is extended. This makes it possible to increase the resolution of the frequency deviation measurement of the timing clock signal when it is determined that the fluctuation of the frequency accuracy of the timing clock signal has become difficult to continue intermittent reception of the radio signal for a long period of time. This has the effect that the accuracy of estimating the reception timing of the radio signal can be improved.
- the frequency deviation measurement time control unit counts the number of continuous receptions of the wireless signal whose estimation error is equal to or less than the allowable maximum value, and the power value becomes equal to or greater than the predetermined threshold.
- the configuration is such that the frequency deviation measurement time of the timing clock signal is set short.
- FIG. 1 is a configuration diagram of a conventional frequency deviation estimating circuit.
- FIG. 2 is a configuration diagram of a reception timing estimation circuit according to Embodiment 1 of the present invention.
- FIG. 3 is a schematic diagram showing an operating environment of a wireless communication device equipped with the reception timing estimating circuit according to Embodiment 1 of the present invention.
- FIG. 4 is an explanatory diagram showing a frequency deviation measurement time table according to the first embodiment of the present invention.
- FIG. 5 is a configuration diagram of a reception timing estimation circuit according to Embodiment 2 of the present invention.
- FIG. 6 is a configuration diagram of a reception timing estimation circuit according to Embodiment 3 of the present invention.
- FIG. 2 is a configuration diagram of a reception timing estimation circuit according to the first embodiment.
- 1 is a high-speed clock oscillator (first oscillator) that includes a TCX 0 and the like and outputs an operation clock signal with high frequency and high frequency stability.
- 2 is provided with an RTC and the like.
- a low-speed clock oscillator (second oscillator) that outputs a timing clock signal whose frequency is lower than that of the signal and has lower frequency stability accuracy, and 3 estimates the reception timing of the radio signal based on the above timing clock signal
- a timing control unit for controlling the start and stop of the high-speed clock oscillator 1.
- 5 is a frequency deviation measurement unit that measures the frequency deviation of the evening clock signal based on the operation clock signal
- 6 is the frequency deviation measurement time based on the timing clock signal.
- the measurement time management unit instructs the frequency deviation measurement unit 5 to start and finish the deviation measurement
- 7 corrects the frequency deviation of the timing clock signal measured by the frequency deviation measurement unit 5, and
- This is a reference timing counter (timing counter) for estimating the reception timing and generating the control signal for the high-speed clock oscillator.
- reference numeral 8 denotes a communication control process of the wireless communication apparatus, and a measurement time control unit (frequency deviation measurement time control unit) for controlling the timing control unit 3.
- 9 denotes a frequency managed by the measurement time management unit 6. It is a frequency deviation measurement time table in which the deviation measurement time is stored in advance.
- FIG. 3 is a schematic diagram illustrating an operation environment of the wireless communication device according to the first embodiment.
- 10 is an incoming call notification, system broadcast information, etc.
- a base station that transmits a control signal transmitted at a predetermined transmission interval T int . 11 is a wireless communication device that is equipped with the reception timing estimation circuit shown in FIG. 2 and receives a control signal transmitted from the base station 10. It is.
- the base station 10 switches the transmission interval T int according to the total number of wireless communication devices accommodated in the wireless communication system and the density of occurrence of communication requests, and transmits a control signal.
- the wireless communication device 11 continuously receives a control signal transmitted from the base station 10 in the transmission interval T int for incoming call waiting and monitoring of system broadcast information.
- the wireless communication device 11 operates the low-speed clock oscillator 2 with low power consumption at all times, and receives a control signal transmitted from the base station 10 based on an evening signal.
- the high-speed clock oscillator 1 having large power consumption is intermittently activated based on the estimated reception timing to perform a control signal reception process.
- the base station 10 transmits the control signal transmission interval T int in the control signal as system broadcast information, and transmits the control signal by receiving the control signal in the wireless communication device 11. , it is possible to transmit fin evening of the base station 1 0 understand the Baru T i nt.
- the measurement time control section 8 based Chikyoku 1 0 Wataru connection continuously control signal to the transmission fin evening time sufficiently longer than the maximum value of the first interval T int of Performs reception processing and receives control signals including system broadcast information.
- the measurement time control unit 8 reads out the transmission interval T int contained in the system broadcast information.
- the measurement time control unit 8 reads out the transmission interval T int every time the wireless communication device 11 receives the control information including the system broadcast information. New transmission fin of the evening it is assumed that one Bal T i nt is saved.
- the timing signal output from the low-speed clock oscillator 2 generally has low frequency stability accuracy
- the timing signal is counted as it is for the above-described predetermined number as it is, and the reception timing is received.
- an estimation error ⁇ ⁇ occurs between the actual transmission interval T int and the estimated reception timing.
- the estimated error delta T increases in proportion to the magnitude of a putative target transmission I Ntabaru T i nt.
- the evening timing control unit 3 and the measurement time control unit 8 Before instructing the high-speed clock oscillator 1 to stop the operation clock signal, the evening timing control unit 3 and the measurement time control unit 8 perform the above-described timing based on the operation clock signal.
- the frequency deviation of the switching clock signal is measured, and the estimation error ⁇ T is corrected based on the frequency deviation.
- the processing of measuring the frequency deviation of the timing clock signal in the timing control unit 3 will be described.
- the measurement time control unit 8 determines a frequency deviation measurement time Tref which is a time length for measuring the frequency deviation.
- the frequency deviation of the timing clock signal is calculated from the timing clock signal and the high-speed clock oscillator 1. It is calculated by measuring the number of counts of each of the output operation signals with high frequency determination accuracy over the frequency deviation measurement time Tref , and comparing both count numbers. Since the frequency deviation of the timing clock signal can increase the measurement resolution in proportion to the length of the frequency deviation measurement time T ref , the frequency deviation measurement time T ⁇ ef from the viewpoint of frequency deviation measurement accuracy Is preferably set as long as possible.
- the frequency deviation measurement time T fef for the frequency deviation measurement it is necessary to input the operation clock signal to the timing control unit 3, so that the high-speed oscillator 1 and the low-speed oscillator 2 Must be activated. Therefore, from the viewpoint of reducing the power consumption of the wireless terminal device, it is desirable that the frequency deviation measurement time T fef be set as short as possible.
- the measurement time control unit 8 notices that the estimated amount of the estimated error ⁇ T of the reception timing increases in proportion to the transmission interval T int , and the base station 10
- the frequency deviation measurement time ef can be set long to measure the frequency deviation of the timing clock signal with high resolution.
- the frequency deviation measurement time T P ef is set short, and the consumption required for the frequency deviation measurement is set. Aim for power suppression.
- the measurement time control unit 8 includes, for example, a relationship between the transmission interval T int and the frequency deviation measurement time T ⁇ ef as illustrated in FIG.
- the frequency deviation measurement time table 9 is stored in advance.
- a plurality of transmission events T int are recorded. It is assumed that a plurality of types of the transmission interval are determined in advance in the system design stage of the communication system. Further, the plurality of transmission fin evening one Bal T int which the frequency deviation measuring time corresponding T ref is for the measurement of expected estimation error delta T in each transmission fin evening Baru T i nt, a desired frequency deviation measuring An appropriate value is set in advance to obtain a resolution of.
- the measurement time control unit 8 read out the set transmission fin evening Baru 1 ⁇ nt by the base station refers to the frequency deviation measuring time table 9, the transmission fin evening Baru T int Read the frequency deviation measurement time T P ef corresponding to. For example, transmission fin evening by the base station 1 0 Baru T int - 7 2 0 when msec is set, the frequency deviation measuring time
- the measurement time control unit 8 outputs the frequency deviation measurement time T ef selected as described above to the measurement time management unit 6 of the timing control unit 3, and outputs the frequency of the Instructs the start of deviation measurement.
- the measurement time management unit 6, which has input the frequency deviation measurement start instruction firstly sets the frequency deviation measurement time Tref to the nominal period of the timing clock signal (in the case of a nominal frequency of 32 kHz, 31.2 Divide by 5 ⁇ sec) to calculate the deviation measurement clock number K.
- the measurement time management unit 6 outputs an operation clock signal count start instruction to the frequency deviation measurement unit 5, and at the same time, starts counting the timing clock signal. Further, the frequency deviation measuring unit 5 that has received the count start instruction starts counting the operation clock signal. Next, when the counting of the deviation measurement clock number K is completed, the measurement time management unit 6 outputs an instruction to end the counting of the operation clock signal to the frequency deviation measurement unit 5 and the reference timing count 7. Frequency deviation measurement unit 5
- the reference timing counter 7 receiving the operation clock signal count end instruction from the measurement time management unit 6 reads out the number of cycles K res of the operation clock signal from the frequency deviation measurement unit 5, and reads the frequency of the operation clock signal and Based on the deviation measurement clock number K, the frequency deviation ⁇ f of the timing clock signal is calculated according to the following equation 1.
- f h is the frequency of the operation clock
- fi is the nominal frequency of the timing clock
- the reference timing counter 7 that has completed the process of calculating the frequency deviation ⁇ f stops the high-speed clock oscillator 1.
- the reference timing counter 7, evening based on the frequency deviation delta f and corrects the frequency of the i timing clock signal measures the transmission Intaparu T i nt based on the tie Mingukuro click signal after the correction, Estimate the reception timing of the next control signal.
- the start and stop of the high-speed clock oscillator 1 are controlled in synchronization with the reception timing estimated as a result, and the operation clock signal is output intermittently.
- the fixed time control unit 8 sets the frequency deviation measurement time table. Referring to 9, the frequency deviation measurement time Tref corresponding to the changed transmission interval T int is determined, and the measurement time management unit 6 is instructed to measure the frequency deviation of the timing clock signal. Measuring time management section 6 which enter the person said instruction, starts the high-speed clock oscillator 1 and through the standard tie Mingukaun evening 7, Thai Mi ring clock signal at a frequency deviation measuring time after updating by the method described above T ref Remeasure the frequency deviation ⁇ f. Thereafter, the reference timing count 7 was obtained as a result of the re-measurement. The frequency of the timing clock signal is corrected based on the frequency deviation ⁇ f, and the reception timing is estimated.
- the measurement time T r ei of the frequency deviation ⁇ f of the timing clock signal having low frequency stability accuracy is determined by the control signal set by the base station 10. automatically switched according to the setting of the transmission fin evening Baru T i nt of. Therefore, when the transmission interval T int is long and the estimation error ⁇ T of the reception timing is expected to be large, the frequency deviation measurement time T ref is set to be long, and the frequency deviation When the measurement resolution is increased to improve the accuracy of the frequency deviation measurement, and the transmission interval T int is short and the estimation error ⁇ T of the reception evening is expected to be small, the frequency deviation measurement time T ref is increased. By shortening it, it is possible to suppress an increase in power consumption required for the process of measuring the frequency deviation ⁇ f.
- the measurement time control unit 8 measures the frequency deviation of the evening clock signal at the time of initial startup of the wireless communication device and at the time of switching the setting of the transmission interval T int by the base station 10.
- the present invention is not limited to such a configuration, and a configuration is provided in which a timer is provided in the measurement time control unit 8 and the frequency deviation measurement processing of the timing clock signal is performed at predetermined time intervals. May be used.
- the measurement time control unit 8 stores a frequency deviation measurement time table 9 in which the frequency deviation measurement time T pf corresponding to each of the plurality of transmission intervals T int is recorded, and according to the frequency deviation measurement time table 9, it is configured that you switch the frequency deviation measurement time T ref in accordance with the setting of the transmission fin evening one Bal T int, the determination of the frequency deviation measuring time T ref is not limited to this method, transmission I A method may be used in which the frequency deviation measurement time Tref is calculated by multiplying the initial conversion Tnt by a predetermined conversion coefficient. Alternatively , a method of applying another arithmetic expression for calculating the frequency deviation measurement time ei based on the transmission interval T int may be used.
- Embodiment 2 Embodiment 2
- the measurement time control unit 8 includes the frequency deviation time measurement table 9, and the timing is determined in accordance with the control signal transmission interval T int set by the frequency base station 10.
- the frequency deviation measurement time T P ef of the clock signal is determined.
- the reception timing estimated by the timing control unit 3 based on the evening clock signal after the frequency deviation correction and the actual The estimation error of both timings is detected by comparing the timing when the control signal is received with the timing at which the control signal is received, and when the estimation error is larger than a predetermined threshold, the frequency deviation measurement time T Pef is set longer. To measure the frequency deviation of the evening clock signal.
- the second embodiment differs from the first embodiment in that a reception timing detection unit for detecting the reception timing of the control signal is provided, and that the reception timing between the estimated reception timing and the actual reception timing of the control signal is provided.
- the only difference is that the estimation error is calculated and the frequency deviation measurement time T P ef is determined according to the estimation error, and the other components are completely the same. Is omitted.
- FIG. 5 is a configuration diagram of a reception timing estimating circuit according to the second embodiment.
- reference numeral 20 denotes a reception timing for receiving a reception signal demodulated by a signal reception unit (not shown in FIG. 5) of the wireless communication apparatus and detecting a control signal included in the reception signal. It is a detection unit.
- the reception timing detection section 20 receives a reception signal demodulated by a signal reception section (not shown in FIG. 5) and receives a control signal from the reception signal.
- the detection processing of a predetermined detection word inserted for identification is performed, and the reception timing of the detected control signal is output to the measurement time control unit 8.
- the reference timing counter 7 of the timing control unit 3 generates estimated reception timing based on the timing clock signal after the frequency deviation correction by the method described in the first embodiment.
- the measurement time control unit 8 receives the estimated reception timing and the reception timing of the actual control signal output from the reception timing detection unit 20 and receives an estimation error ⁇ T of the reception timing. Is detected.
- the measurement time control unit 8 receives evening Ri Contact stored allowable maximum value delta T m ax estimation error Lee timing advance, compares said estimated error delta T and the allowable maximum value AT ma x, If the estimated error ⁇ T is larger than the allowable maximum value ⁇ T ffl ax , the frequency deviation measurement time T ref determined based on the frequency deviation measurement time table 9 shown in FIG. 4 is extended. .
- the allowable maximum value delta T m ax is started after starting the high-speed clock oscillator 1, the signal receiver required until the wireless communication device is capable of receiving a control signal (not shown in FIG. 5)
- An appropriate value shall be set in consideration of time.
- the measurement time control unit 8 instructs the measurement time management unit 6 to measure the frequency deviation of the timing clock signal.
- the clock 7 corrects the timing clock signal with the frequency deviation, generates an estimated reception timing, and controls the start / stop of the high-speed clock oscillator 1 according to the estimated reception timing.
- the reception timing estimation circuit includes the reception timing detection unit 20 that detects the reception timing of the control signal that is intermittently transmitted, and the measurement time control unit 8 uses the reference timing If the estimated error ⁇ T between the estimated reception timing generated by the timer and the actual reception timing of the control signal ⁇ T is larger than the allowable maximum value ⁇ T max , the frequency deviation measurement time T P ef is extended. The measurement of the frequency deviation of the timing clock signal. Therefore, fluctuations in the frequency stability accuracy of the low-speed clock oscillator 2 increase depending on fluctuations in the use environment of the wireless communication device, such as changes in the ambient temperature, and it is not possible to accurately estimate the reception timing.
- the measurement time control section 8 was extended 2 0% frequency deviation measurement time T re f when the estimated error delta T estimated received evening Lee Mi ring is greater than the maximum allowed delta T max
- the extension amount of the frequency deviation measurement time T P ef is not limited to 20%, and an appropriate value for obtaining the desired resolution of the frequency deviation measurement accuracy when the estimation error ⁇ T increases. I just need.
- the measurement time control section 8 the frequency deviation measuring when the estimated error delta T estimated received tie Mi ring generated by the position reference-timed Gukaun evening 7 is greater than the allowable maximum value delta T max I was instructed, but in the present third implementation, the estimation error delta T is the maximum allowed delta T max is greater than the control signal The number of consecutive receptions of the control signal and the number of consecutive receptions of control signals whose estimation error ⁇ T is less than the maximum allowable value ⁇ ⁇ ⁇ ⁇ ⁇ Adjust the measurement time T P ef .
- the third embodiment is different from the second embodiment in that the measurement time control unit 8 includes a counter for measuring the number of continuous receptions of the control signal, and the magnitude of the frequency deviation measurement time is determined based on the number of counts. The only difference is that the point is adjusted, and the other configurations are exactly the same.
- FIG. 6 is a configuration diagram of a reception timing estimating circuit according to the third embodiment.
- 2 1 estimated received timing estimation error delta T error detection counter evening measures the continuous reception times of the allowable maximum value delta T max greater control signals
- 2 2 the estimated error ⁇ T Is less than the maximum allowable value ⁇ T max .
- the measurement time control unit 8 determines the frequency deviation measurement time Tref according to the frequency deviation measurement time table 9 by the method described in the first embodiment, and the measurement time management unit 6 and the frequency deviation measurement unit 5 The frequency deviation of the timing clock signal is measured over the deviation measurement time Tref .
- the reference clock timing counter 7 corrects the frequency of the timing clock signal based on the measurement result, generates estimated reception timing, and controls the start / stop of the high-speed clock oscillator 1.
- the measurement time control unit 8 In a state where the wireless communication device is intermittently operating the high-speed clock oscillator 1 and receiving a control signal, the measurement time control unit 8 generates the reference time counter 7 every time a control signal is received.
- the estimated reception timing is compared with the actual reception timing output from the reception timing detection unit 20 to calculate an estimated error ⁇ T of the estimated reception timing.
- the estimation time control unit 8 compares the estimation error ⁇ T with the allowable maximum value ⁇ T max of the estimation error.
- the error detection counter evening counter 2 1 Ta Tsu At the same time, the count value of normal reception count 22 is initialized to zero.
- the error detection counter evening 2 1 estimated error ⁇ T is saved continuous reception times of the maximum allowed delta T max is greater than the control signal, while the error detection counter evening 2 2 estimation error ⁇ T is the continuous reception times of the maximum allowed ⁇ T max than the a control signal is stored.
- the estimation error ⁇ T becomes a plurality of times. At the reception timing of the control signal, it continuously becomes larger than the allowable maximum value ⁇ Tmax , and the count value of the error detection count 21 increases.
- the measurement time control unit 8 includes a threshold value K! For the number of continuous receptions of the control signal for determining whether or not to measure the frequency deviation of the evening clock signal.
- the frequency deviation measurement time T P ef is set in the same manner as in the second embodiment. This is extended to notify the measurement time management unit 6 and to instruct the start of frequency deviation measurement.
- the threshold value Ki is assumed to be a change in the usage environment of the wireless communication device which is assumed in advance.
- the size should be set appropriately in order to cope with changes (for example, fluctuations in ambient temperature).
- the frequency deviation measuring section 5 the frequency deviation of Wataruction Thailand Mi ring clock signal extended frequency deviation measurement time I ef is measured, reference Thailand Mi Ngukaun evening 7, thereafter, was correct the frequency deviation Generates estimated reception timing based on the timing signal.
- the estimation error ⁇ T of the estimated reception timing becomes small.
- the estimation error ⁇ T is a smaller than the allowable maximum value delta T max Kunar, the count value of the normal reception counter evening 2 2 increases.
- a threshold value K 2 of the continuous reception times teaching of control signals for determining whether the frequency deviation of the tie Mi ring clock signal is stable is stored.
- the count value of the normal reception counter evening 2 2 had large summer also Ri good threshold K 2 are, environmental change of the wireless communication terminal is rather small, evening the variation of frequency deviation Lee Mi ring clock signal is low determination to be shortened as extended frequency deviation measurement time T ref described above, the frequency deviation measuring time T ⁇ ef defined by the frequency deviation measuring time table 9.
- the threshold K 2 is set in advance to the number of control signals received in a sufficiently long time (for example, 15 minutes, 30 minutes, 1 hour, etc.) in order to determine the stable operation of the low-speed clock oscillator 2. Shall be performed.
- the measurement time control section 8 normal reception counter evening 2 when the second count value was greater summer than the threshold value K 2
- the frequency deviation measurement time T ref frequency deviation measuring time table It was shortened to frequency deviation measuring time T r ef defined by 9, which is not intended to be limited to such a configuration, greater than the normal reception counter evening 2 2 count value is the threshold value K 2
- the frequency deviation measurement time Tf may be shortened by a predetermined ratio.
- the radio communication apparatus and the reception timing estimation method according to the present invention measure the frequency deviation of the timing clock signal used for generation of the estimated reception timing with high accuracy while suppressing an increase in power consumption. It is suitable for accurately estimating the reception timing of intermittently transmitted radio signals.
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Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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DE60234337T DE60234337D1 (de) | 2001-06-05 | 2002-06-03 | Funkkommunikationsvorrichtung und ihr empfangszeitsteuerungs schätzverfahren |
US10/477,193 US7013119B2 (en) | 2001-06-05 | 2002-06-03 | Radio communication apparatus and its reception timing estimating method |
EP02730880A EP1395072B1 (en) | 2001-06-05 | 2002-06-03 | Radio communication apparatus and its reception timing estimating method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2001169077A JP3636097B2 (ja) | 2001-06-05 | 2001-06-05 | 無線通信装置及びその受信タイミング推定方法 |
JP2001-169077 | 2001-06-05 |
Publications (1)
Publication Number | Publication Date |
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WO2002100123A1 true WO2002100123A1 (fr) | 2002-12-12 |
Family
ID=19011193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/005440 WO2002100123A1 (fr) | 2001-06-05 | 2002-06-03 | Appareil de communication radio et procede d'estimation de temps de reception associe |
Country Status (6)
Country | Link |
---|---|
US (1) | US7013119B2 (ja) |
EP (1) | EP1395072B1 (ja) |
JP (1) | JP3636097B2 (ja) |
CN (1) | CN1247038C (ja) |
DE (1) | DE60234337D1 (ja) |
WO (1) | WO2002100123A1 (ja) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006040699A1 (en) * | 2004-10-11 | 2006-04-20 | Koninklijke Philips Electronics N.V. | Non-linear frequency and phase measurement scheme |
JP2008124524A (ja) * | 2005-03-04 | 2008-05-29 | Matsushita Electric Ind Co Ltd | 間欠受信制御装置 |
US20090029657A1 (en) * | 2005-08-01 | 2009-01-29 | Mitsubishi Electric Corporation | Auto frequency control method |
TWM323062U (en) * | 2007-06-20 | 2007-12-01 | Princeton Technology Corp | Correcting apparatus and clock device using the same |
JP4718595B2 (ja) * | 2007-12-27 | 2011-07-06 | パナソニック株式会社 | 無線通信システム及び携帯端末装置 |
US8135553B2 (en) * | 2008-07-31 | 2012-03-13 | Mediatek Inc. | Method for clock calibration |
CN101835214B (zh) * | 2010-03-16 | 2014-04-30 | 中兴通讯股份有限公司 | 用于数字集群通信的切换处理方法及基站 |
US8943352B1 (en) * | 2012-05-07 | 2015-01-27 | Dust Networks, Inc. | Low power timing, configuring, and scheduling |
US9698872B2 (en) | 2013-06-18 | 2017-07-04 | Qualcomm Incorporated | Methods and apparatus for improving remote NFC device detection using a low power oscillator circuit |
JP6156080B2 (ja) * | 2013-11-12 | 2017-07-05 | 富士通株式会社 | 無線基地局および無線通信システム |
EP2903199B1 (en) * | 2014-01-31 | 2019-03-06 | Stichting IMEC Nederland | Circuit for symbol timing synchronization |
US10694467B2 (en) * | 2017-09-28 | 2020-06-23 | Qualcomm Incorporated | Dynamic clock switching within a transmission time interval |
CN108230660B (zh) * | 2018-01-09 | 2020-08-25 | 广东美的制冷设备有限公司 | 控制方法及控制装置、存储介质及遥控器 |
US11038510B2 (en) * | 2019-05-29 | 2021-06-15 | Timecubic, Inc. | Oscillator with time error correction |
JP7328064B2 (ja) * | 2019-08-07 | 2023-08-16 | ファナック株式会社 | 同期方法、及び制御装置 |
CN113132027B (zh) * | 2019-12-30 | 2023-02-10 | 江西联智集成电路有限公司 | 无线电发射器的工作频率校正方法及其装置 |
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JPH10190568A (ja) * | 1996-12-27 | 1998-07-21 | Matsushita Electric Ind Co Ltd | 無線受信装置 |
JPH10209952A (ja) * | 1997-01-24 | 1998-08-07 | Nec Ic Microcomput Syst Ltd | 移動体通信装置の間欠受信方式 |
JP2000049682A (ja) * | 1998-07-31 | 2000-02-18 | Hitachi Ltd | 携帯電話端末 |
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US5633898A (en) * | 1993-12-22 | 1997-05-27 | Matsushita Electric Industrial Co., Ltd. | Automatic frequency control apparatus for FSK receiver and FSK receiver including the same |
JPH10322259A (ja) * | 1997-05-19 | 1998-12-04 | Matsushita Electric Ind Co Ltd | デジタルコードレス通信システム |
JP2000013269A (ja) | 1998-06-22 | 2000-01-14 | Matsushita Electric Ind Co Ltd | 無線受信装置及び周波数偏差推定方法 |
JP3689021B2 (ja) * | 2001-05-25 | 2005-08-31 | 三菱電機株式会社 | タイミング制御装置及びタイミング制御方法 |
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2001
- 2001-06-05 JP JP2001169077A patent/JP3636097B2/ja not_active Expired - Fee Related
-
2002
- 2002-06-03 US US10/477,193 patent/US7013119B2/en not_active Expired - Fee Related
- 2002-06-03 CN CNB028110579A patent/CN1247038C/zh not_active Expired - Fee Related
- 2002-06-03 WO PCT/JP2002/005440 patent/WO2002100123A1/ja active Application Filing
- 2002-06-03 EP EP02730880A patent/EP1395072B1/en not_active Expired - Lifetime
- 2002-06-03 DE DE60234337T patent/DE60234337D1/de not_active Expired - Lifetime
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JPH10190568A (ja) * | 1996-12-27 | 1998-07-21 | Matsushita Electric Ind Co Ltd | 無線受信装置 |
JPH10209952A (ja) * | 1997-01-24 | 1998-08-07 | Nec Ic Microcomput Syst Ltd | 移動体通信装置の間欠受信方式 |
US6088602A (en) | 1998-03-27 | 2000-07-11 | Lsi Logic Corporation | High resolution frequency calibrator for sleep mode clock in wireless communications mobile station |
JP2000049682A (ja) * | 1998-07-31 | 2000-02-18 | Hitachi Ltd | 携帯電話端末 |
JP2000224100A (ja) * | 1999-02-04 | 2000-08-11 | Nec Saitama Ltd | 効率的に電源供給を制御する通信装置、制御方法、及び記録媒体 |
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See also references of EP1395072A4 |
Also Published As
Publication number | Publication date |
---|---|
DE60234337D1 (de) | 2009-12-24 |
US7013119B2 (en) | 2006-03-14 |
CN1513273A (zh) | 2004-07-14 |
EP1395072B1 (en) | 2009-11-11 |
EP1395072A1 (en) | 2004-03-03 |
JP3636097B2 (ja) | 2005-04-06 |
EP1395072A4 (en) | 2008-04-02 |
CN1247038C (zh) | 2006-03-22 |
JP2002368670A (ja) | 2002-12-20 |
US20040162046A1 (en) | 2004-08-19 |
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