CN112236942A - Method and apparatus for digital quartz temperature and drift compensation of sleep timers for NB-IoT devices - Google Patents
Method and apparatus for digital quartz temperature and drift compensation of sleep timers for NB-IoT devices Download PDFInfo
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- 239000010453 quartz Substances 0.000 title claims abstract description 80
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000013078 crystal Substances 0.000 claims abstract description 47
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000005070 sampling Methods 0.000 claims description 38
- 238000009529 body temperature measurement Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims 1
- 230000003068 static effect Effects 0.000 description 9
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
- H03L1/028—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only of generators comprising piezoelectric resonators
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
- H03L1/022—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature
- H03L1/026—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature by using a memory for digitally storing correction values
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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
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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
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Abstract
The invention discloses a digital quartz temperature and drift compensation method and device of a sleep timer of NB-IoT equipment. The object of the present invention is to find a way to perform efficient quartz crystal temperature and drift compensation in NB-IoT devices, which object is solved by a method comprising the steps of: determining the temperature dependence of the quartz crystal frequency offset relative to an external reference to generate quartz crystal parameters; storing the quartz crystal parameters for further processing; acquiring the temperature measured by the temperature sensor; the deviation of the quartz crystal frequency offset due to its temperature dependency and the measured temperature is calculated and a compensation pulse for the sleep timer is generated from the deviation of the quartz frequency offset to adjust the counter value of the sleep timer of the NB-IoT device. The object is also solved by a device for carrying out the method according to the invention.
Description
Technical Field
The invention relates to a digital quartz temperature and drift compensation method of a sleep timer of an NB-IoT device.
The invention also relates to a digital quartz temperature and drift compensation device of the sleep timer of the NB-IoT equipment.
Background
Narrowband internet of things (NB-IoT) devices are fairly new. These devices are typically connected to an IoT network (internet of things), which is inexpensive to use/produce and is bulky in number.
Many internet of things devices cannot physically access them once they are put into operation. Such as sensors placed in streets, animals or other inaccessible locations. Since batteries cannot be recharged or replaced, it is important to protect and conserve the battery power of these devices. Furthermore, these devices are only woken up for a short time when sending or providing data to the network, and in most cases, these devices are in a sleep mode. For some applications, it is important that NB-IoT devices provide and transmit their data at specified points in time, and therefore, it is important to ensure that these devices are awake at specific specified times. Therefore, narrowband internet of things (NB-IoT) devices include a sleep timer with a quartz crystal to wake up and send the required data after a long deep sleep period.
For internet of things applications, X-cut crystals are typically used for the 32kHz sleep timer of NB-IoT devices.
It is well known that, in general, the temperature dependence of an X-cut crystal is parabolic, with the offset showing the following characteristics:
wherein c isTIs the temperature coefficient of the quartz crystal, which is, for example, -0.025ppm … -0.05ppm/K2In the range of (1), and so-called "Inflection temperature "T0In the range of, for example, 20 … 30 c. d0The term describes the pseudo-static frequency offset (initial offset plus potential drift effects) which is about + -10% of the temperature offset. The temperature T is considered to be in the range of, for example, -55 … +125 ℃ (industry extension).
FIG. 1 shows the temperature coefficient cTTo quartz frequency shift dfThe influence of (c). FIG. 2 shows the inflection point temperature T0Influence on the quartz frequency shift, while the inflection temperature is understood to be the temperature at which the tangent to the parabola is parallel to the x-axis. FIG. 3 shows the static offset d0The effect on the frequency shift of quartz.
Until now, the compensation of the quartz temperature and the drift compensation in temperature measurement settings have been carried out in an analog manner, either by means of a quartz crystal which is heated in a controlled manner or by means of a "pulling circuit" as the quartz frequency.
For narrowband internet of things (NB-IoT) devices, it is absolutely disadvantageous to use a quartz crystal with power consumption heating function to compensate for drift due to temperature dependency of the quartz crystal of the sleep timer.
It is therefore an object of the present invention to provide a method and apparatus that allows to take advantage of the known characteristics of quartz oscillators commonly used in such NB-IoT devices in order to compensate for temperature and quartz crystal frequency drift due to temperature and to make the device less costly, less power consuming and more flexible. In general, it is desirable to find a way to achieve effective quartz crystal temperature and drift compensation in NB-IoT devices.
Disclosure of Invention
The object of the invention is solved by a method for digital temperature and drift compensation of a quartz crystal of a sleep timer used by a narrowband internet of things (NB-IoT) device with respect to a nominal frequency, comprising the steps of:
-determining a temperature dependence of the quartz crystal frequency shift with respect to an external reference, thereby deriving quartz crystal parameters;
-storing the quartz crystal parameters for further processing;
-acquiring a temperature measured by a temperature sensor;
-calculating the deviation of the frequency shift of the quartz crystal due to its temperature dependency and the measured temperature; and
-generating a compensation pulse for the sleep timer according to the deviation of the quartz crystal frequency offset to adjust the count value of the sleep timer of the NB-IoT device.
Detailed Description
Before describing further preferred and advantageous embodiments of the inventive method, the working principle of such quartz crystal for sleep timers of NB-IoT devices and its temperature dependency are considered.
It is well known that both static and dynamic offset factors must be considered to compensate for their effect in NB-IoT devices that use quartz crystals to count in sleep timers and determine their active and idle periods.
First consider the static offset factor. Typically, the measured temperature T and the quartz crystal parameter cTAnd d0And to some extent inaccurate. The overall uncertainty d is caused by these individual uncertaintiesfThe propagation of uncertainty can be estimated using the variance equation:
looking at each factor separately can be simplified as follows:
can be set for each parameter (temperature T, temperature coefficient c) of the quartz crystalTAnd pseudo-static frequency offset d0) A maximum uncertainty budget is determined. The individual impact of each parameter can be calculated and considered in the hardware design of the NB-IoT device according to the global error range (e.g., 0.5ppm) that will be defined first.
To evaluate the bulk quartz temperature and drift compensation, dynamic offset factors must also be considered.
Frequency offset d calculated according to the formula (formula 1)fThe instantaneous deviation for a given point in time is described. If the integration is performed within a certain time interval, the number of missing/exceeded clock pulses within the time interval can be obtained by:
to date, all calculations regarding uncertainty and resolution have been performed under the assumption of static, but uncertain, measured temperature and static quartz crystal parameters. In fact, temperature is a function of time, most simply modeled as a linear dependence:
T＝T(t)＝gT·t+Ts
(formula 7)
Substituting equation (equation 7) into equation (equation 1) yields:
df(t)＝cT·(gT·t+Ts-T0)2+d0＝cT·(gT·t+Tc)2+d0
(formula 8)
Therefore, the frequency offset is accumulated when the temperature changes and is sampled only at a certain interval Δ t. This is depicted in fig. 4, which uses the formula (formula 8) as the temporal temperature dependence. FIG. 4 shows the frequency offset df(t) (dotted line) versus temperature (dotted line), assuming temperature at time interval t0…t0Linearly over time within + Δ t. The solid line shows the quartz frequency shift as a function of time. Accumulated error versus shaded area in FIG. 4The domains correspond and the larger the error, the larger the sampling interval, and the steeper the temperature gradient at that point of the curve. Constant temperature interval (t)<t0Or t>t0The frequency offset during + at) can be fully compensated for, so these constant factors do not increase the sampling error e. Thus:
solving the integral yields:
after various conversions, the following results are finally obtained:
the error calculated according to the formula (formula 11) basically describes the compensation of the calculated value when only the exact sampling time is used without any interpolation. In other words, the integral PrealThe time offset curve is approximated by a rectangular sequence.
However, a better approximation can be obtained by segmenting the trapezoid:
now, P in equation (equation 9) is replaced with the recent similarity value of equation (equation 12)approxThe term can be derived:
this residual (uncompensable) error will be generated in each sampling interval as long as the temperature is changing. For a worst-case estimation, the entire operating range Δ T should be consideredmaxLinear temperature change in the inner. The duration of this full-range variation depends on the temperature gradient gT:
And the number of sampling intervals is thus:
thus, the total error that should be calculated for this full range temperature sweep is the product of the number of steps and the uncompensated error per step, as shown in equation (equation 13):
for constant temperature, the allowable offset of the global error range, defined by static factors, e.g. 0.5ppm, is summed up to a total offset:
etot,stat＝0.5*D
(formula 17)
Now, assuming that the total time offset according to equation (equation 16) should not exceed the static impact, the following relationship can be derived:
then is converted into
Thus, the sampling interval Δ t should correspond to an assumed or measured temperature gradientDegree gTIn inverse proportion.
Depending on the effect of all the offsets described above, the actual frequency may be too slow or too fast relative to the nominal frequency. Since the actual frequency drives the sleep timer counter, this means that the accumulated counter values over a given time interval differ by a number of scales and that the value is too low or too high. As mentioned above, the frequency offset d (T) may be determined as a function of the primary measured temperature T. With this knowledge, it is possible to compensate for the reverse bias of the sleep timer. Basically, the method comprises the following steps:
CT＝fT·Δt＝(f0+df)·Δt＝Cnorm+Coffs
(formula 20)
To compensate for this deviation, C must be added/subtracted during interval Δ toffsAnd (4) calibration. This is done by providing a slave offset clock fTDerived clock dcThe method is realized as follows:
therefore, it is not only easy to use
Ccomp＝dc·Δt
(formula 22)
And thus
The formula (equation 21) may be tedious, but it reflects the fact that: despite the frequency shift dfThe only clock available for counting is the temperature-affected quartz clock of the sleep timer, which is known. Therefore, a fractional divider according to fig. 5 is used, which is capable of accurately generating:
combining equation (equation 21) and equation (equation 24) yields:
inc＝|df|
(equation 25)
And
after deriving the theory underlying the method of the present invention, in one embodiment the temperature is preferably acquired at fixed temperature sampling intervals. This is the simplest form of the method of the invention and is most suitable for environments where temperature is substantially stable, as only the static frequency offset needs to be compensated for.
In another preferred embodiment of the inventive method, the temperature is acquired at an adaptive temperature sampling interval. This means that the temperature sampling interval will be dynamically re-selected at each new sampling point to minimize the uncompensated error caused substantially by temperature fluctuations during the sampling interval. In practice, the resolution of the parameters (temperature difference, offset) used to determine the next sampling interval is lower than the resolution of these types of data. This is the case to save power and area in implementation without sacrificing control interval selection capability.
In another embodiment of the inventive method, the temperature sampling interval is selected based on a maximum of four temperature ranges. This is achieved by specifying three limits as the knee temperature T of the quartz crystal used for the sleep timer0The absolute difference of (c). The effective number of ranges can be reduced by assigning the same value to the limit values, for example when two limit values are set to the same value, the number of ranges is reduced to three instead of four. The range defined by the temperature difference limit should be selected based on the derivative and/or result of the formula (equation 1). Since the absolute result (and thus the offset to be compensated for) is low and the sensitivity to temperature variations is low, the knee temperature T can be made0The surrounding range is wider, limiting the total amount of uncompensated error. Thus more extension should be smallerIt is used.
In another embodiment of the inventive method, the temperature sampling interval is selected based on the temperature difference between the previous sampling point and the current sampling point. This method will be used when operating in an environment of dynamic temperature changes or high temperature gradients, which has the advantage of keeping a good balance between the measurement frequency, which consumes some power, and the compensation accuracy.
In another embodiment of the method of the present invention, the temperature sampling interval is selected based on a predicted offset for compensation at a previous temperature measurement and a calculated offset of a previous interval determined by the current measurement multiplied by the length of the previous sampling interval. This results in a residual offset that needs to be compensated backwards at the beginning of the next sampling interval. This method will be used when the temperature fluctuations again show a large change, which has the advantage of minimizing the amount of post-compensation per new sampling time.
In a further embodiment of the inventive method, the temperature sampling interval is selected based on the temperature difference between the previous sampling point and the current sampling point, and the predicted offset for compensation at the time of the previous temperature measurement and the calculated offset of the previous interval determined by the current measurement multiplied by the length of the previous sampling interval. This is a combination of the embodiments of the method according to the invention as claimed in claims 5 and 6. This approach will be used when there is an unknown thermal environment, which has the advantage of providing good compensation under arbitrary conditions.
And, in another further embodiment of the inventive method, the external reference is the wireless cell with which the NB-IoT is communicating. Since the clock of the wireless cell is very accurate, it is desirable to use the clock of the wireless cell to adjust the clock of the sleep timer of the NB-IoT device during the active period of the NB-IoT device, thereby compensating for the quartz temperature and drift during the longer sleep period, which is a great advantage.
It can be seen as an advantage of the method according to the invention that it offers the possibility of compensating for drift characteristics of the quartz crystal due to temperature dependence. Since only pulses of quartz crystal are available during the sleep period of the NB-IoT device, only the quartz frequency is used as a reference. By compensating the quartz frequency according to known characteristics, any drift and deviations can be compensated and corrected. In the active phase, the NB-IoT may obtain a reference time indication from the connected wireless cell. The quartz crystal frequency can be determined relative to the frequency of the radio unit to obtain a true difference. With this knowledge, the curvature and displacement of the quartz crystal frequency can be adjusted.
The object of the invention is also solved by an arrangement for digital quartz temperature and drift compensation of sleep timers for narrowband internet of things (NB-IoT) devices. The device includes: a temperature sensor connected to the temperature acquisition module; an offset calculation module connected to the internal storage module; and a temperature acquisition module for calculating and determining a shift in the quartz frequency of the quartz crystal of the sleep timer due to its temperature dependency based on the temperature values measured by the temperature sensor, the sleep timer (11) being connected to the means for digital quartz temperature and drift compensation, the apparatus further comprising an adjustment generator for providing tuning pulses to the sleep timer of the NB-IoT device during a sleep phase based on the measured and determined temperature dependency of the sleep timer frequency shift, the adjustment generator being connected to the shift calculation module and to a control Finite State Machine (FSM), the FSM controlling the temperature acquisition module, the internal storage module and the adjustment generator.
From the acquired temperature measurements and information about the frequency offset, Quartz Temperature and Drift Compensation (QTDC) is responsible for the deviation of the equilibrium, which is the deviation of a 32kHz crystal, for example, of a sleep timer, from the nominal frequency. The adjustment generator then generates a compensation pulse for the sleep timer, which is used to adjust the count value of the sleep timer in the sleep timer.
A finite state machine is used to control the compensation process. It determines the sampling interval according to the register settings, acquires the temperature and controls the generation of the compensation pulses.
In an apparatus embodiment of the digital quartz temperature and drift compensation of the sleep timer of a narrowband internet of things (NB-IoT) device of the present invention, the adjustment generator is a fractional divider. Fractional frequency divider (also called clock divider, frequency divider)Or prescaler) is a circuit that receives a frequency finAnd generates an input signal of frequency fout＝finM/n, where m and n are integers. The fractional divider provides a tuning pulse to the sleep timer of the NB-IoT device during the sleep phase based on the measured and determined temperature dependence of the sleep timer frequency offset. Compared to known NB-IoT devices without quartz temperature and drift compensation, it has the advantages: since the wake-up time can be set closer to the actual time the device needs to operate, the device can remain in the low power deep sleep mode for a longer period of time. It is no longer necessary to add a large safety margin in the wake-up time to compensate for frequency uncertainty.
In another embodiment of the device according to the invention, the temperature sensor comprises a digital interface. This has the advantage of using existing sensors such as those that widely use the I2C or SPI interface.
The invention will be explained in more detail below using exemplary embodiments.
The figures show:
FIG. 1 temperature coefficient CTThe effect on quartz frequency shift;
FIG. 2 inflection temperature T0The effect on quartz frequency shift;
FIG. 3 static offset d0The effect on quartz frequency shift;
FIG. 4 the effect of temperature sampling interval Δ t on quartz frequency shift;
FIG. 5 a fractional divider;
FIG. 6 is a workflow of the method of the present invention;
fig. 7 digital quartz temperature and drift compensation inventive means for sleep timer of NB-IoT devices.
Fig. 6 illustrates a workflow of a method of digital temperature and drift compensation of a quartz crystal of a sleep timer of a narrowband internet of things (NB-IoT) device of the present invention with respect to a nominal frequency. In a first step, it will be determined whether a quartz crystal parameter of a quartz crystal for a sleep timer is known; if these parameters are not known, the parameters need to be determined by separate measurements, which is disadvantageous for mass production facilities. The parameters may also be determined from an external reference, such as the aforementioned connected radio cell.
If the quartz crystal parameters are known or determined and stored for further processing, the temperature measured by the temperature sensor is obtained. Using the acquired temperature, a deviation of a quartz crystal frequency shift due to the temperature dependency and the measured temperature is determined, and a compensation pulse for the quartz crystal of the sleep timer is calculated from the deviation of the quartz crystal frequency shift in order to adjust a counter value of the sleep timer of the NB-IoT device. Therefore, to generate pulses with a frequency that is a fraction of the reference clock, i.e., the quartz crystal clock of the sleep timer or the fraction of the time indication of the wireless cell to which the NB-IoT device is connected, a fractional divider is used.
Fig. 7 shows an exemplary setup of the inventive arrangement for digital quartz temperature and drift compensation of the sleep timer 11 of the NB-IoT device 1. The device includes: a temperature sensor 2 connected to the temperature acquisition module 3; an offset calculation module 4 connected to the internal storage module 5; and a temperature acquisition module 3 for calculating and determining a shift of the quartz frequency for the sleep timer 11 due to its temperature dependency from the temperature values measured by the temperature sensor 2, the fractional divider 6 for providing tuning pulses to the sleep timer 11 of the NB-IoT device 1 during the sleep phase according to the measured and determined temperature dependency of the frequency shift of the sleep timer 11. The fractional divider 6 is connected to the offset calculation module 4 and the control Finite State Machine (FSM)7, while the FSM 7 controls the temperature acquisition module 3, the internal memory module 5 and the regulation generator 6.
List of reference marks
Digital quartz temperature and drift compensation for 1 NB-IoT devices
2 temperature sensor
3 temperature acquisition module
4 offset calculation module
5 internal memory module
6 regulating generators, e.g. fractional dividers
7 Finite State Machine (FSM)7
11 sleep timer
Claims (11)
1. A method of digital temperature and drift compensation of a quartz crystal of a sleep timer of a narrowband internet of things (NB-IoT) device with respect to a nominal frequency, the method comprising the steps of:
-determining a temperature dependence of the quartz crystal frequency shift with respect to an external reference, generating quartz crystal parameters,
-storing the quartz crystal parameters for further processing,
-acquiring the temperature measured by the temperature sensor,
-calculating a deviation of the quartz crystal frequency shift due to the temperature dependency of the quartz crystal frequency shift and the measured temperature, and
-generating a compensation pulse for the sleep timer according to the deviation of the quartz crystal frequency offset to adjust the count value of the sleep timer of the NB-IoT device.
2. The method of digital temperature and drift compensation of an NB-IoT device of claim 1, wherein the temperature is obtained at a fixed temperature sampling interval.
3. The method of digital temperature and drift compensation of an NB-IoT device of claim 1, wherein the temperature is obtained at an adaptive temperature sampling interval.
4. The method of digital temperature and drift compensation of an NB-IoT device according to any of claims 2 or 3, wherein the temperature sampling interval is selected based on a maximum of four temperature ranges.
5. The method of digital temperature and drift compensation of an NB-IoT device according to any of claims 2 to 4, wherein the temperature sampling interval is selected based on a temperature difference between a previous sampling point and a current sampling point.
6. The method of digital temperature and drift compensation of an NB-IoT device according to any of the preceding claims, wherein the temperature sampling interval is selected based on a predicted offset for compensation at the time of the previous temperature measurement and a calculated offset of the previous interval determined by a current measurement multiplied by a length of the previous sampling interval.
7. The method of digital temperature and drift compensation of NB-IoT devices according to one of the preceding claims, wherein the temperature sampling interval is selected based on a temperature difference between a previous sampling point and a current sampling point, and the predicted offset used for compensation at the time of the previous temperature measurement and a calculated offset of the previous interval determined by the current measurement multiplied by the length of the previous sampling interval.
8. The method of digital temperature and drift compensation of an NB-IoT device according to any of the preceding claims, wherein the external reference is a wireless cell in communication with the NB-IoT.
9. An apparatus (1) for digital quartz temperature and drift compensation of sleep timers for narrowband internet of things (NB-IoT) devices, comprising: a temperature sensor (2) connected to the temperature acquisition module (3); an offset calculation module (4) connected to the internal storage module (5); and the temperature acquisition module (3) is used for calculating and determining the offset of the quartz frequency of the sleep timer (11) due to the temperature dependency thereof according to the temperature value measured by the temperature sensor (2), the sleep timer (11) is connected to the means for digital quartz temperature and drift compensation, the means further comprising an adjustment generator (6), for determining a temperature dependency of the sleep timer (11) frequency offset based on the measured and determined temperature dependency, providing a tuning pulse to the sleep timer (11) of the NB-IoT device during a sleep phase, said regulation generator (6) being connected to said offset calculation module (4) and to a control finite state machine (7) (FSM), the FSM (7) controls the temperature acquisition module (3), the internal storage module (5) and the regulation generator (6).
10. The apparatus for digital quartz temperature and drift compensation of sleep timers of narrowband internet of things (NB-IoT) devices (1) according to claim 1, wherein the adjustment generator (6) is a fractional divider.
11. The device according to claim 1 or 2, wherein the temperature sensor (2) comprises a digital interface.
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| PCT/EP2018/069532 WO2020015828A1 (en) | 2018-07-18 | 2018-07-18 | Method and apparatus for digital quartz temperature and drift compensation for a sleep timer of a nb-iot device |
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| CN114025421A (en) * | 2021-11-11 | 2022-02-08 | 中国电子科技集团公司第五十四研究所 | Low-power consumption wake-up clock pre-compensation device and method for heaven-earth satellite internet of things terminal |
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| CN112380774B (en) * | 2020-11-23 | 2022-04-15 | 青岛柯锐思德电子科技有限公司 | Dynamic modeling method and system based on residual echo state network |
| CN114500209B (en) * | 2021-12-23 | 2024-02-27 | 北京智联安科技有限公司 | Frequency offset compensation method, system, electronic equipment and computer readable storage medium |
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| CN114025421B (en) * | 2021-11-11 | 2024-04-26 | 中国电子科技集团公司第五十四研究所 | Low-power consumption wake-up clock precompensation device and method for antenna satellite Internet of things terminal |
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| Publication number | Publication date |
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| CN112236942B (en) | 2023-12-05 |
| WO2020015828A1 (en) | 2020-01-23 |
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