CN108243436B - Time offset calibration method and device and mobile terminal - Google Patents
Time offset calibration method and device and mobile terminal Download PDFInfo
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Abstract
The invention provides a time offset calibration method, a time offset calibration device and a mobile terminal. The method comprises the following steps: when the mobile terminal is in an idle discontinuous reception mode, trying different sampling points to blindly detect a physical broadcast channel signal around a wireless frame subframe 0; recording the position of a sampling point of a first successfully detected physical broadcast channel signal, and recording the coordinate value of the position of the sampling point as the deviation of the sampling point; under the sampling point deviation, channel estimation is carried out according to a reference signal of a service cell where the mobile terminal is located; and calculating the deviation of the temporary sampling point according to the result of channel estimation, calculating a deviation correction value, obtaining a time deviation value obtained by averaging the deviation correction values for multiple times, storing the time deviation value, and directly performing timing synchronization on the time deviation value and the base station in a subsequent idle discontinuous receiving period. The invention can solve the problem of large time deviation of the awakening of the mobile phone from the idle state caused by large deviation of the 32KHz clock of the mobile phone, thereby ensuring that the mobile phone can normally receive signals.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a time offset calibration method, a time offset calibration device and a mobile terminal.
Background
The mobile phone chip has a 32KHz clock source for maintaining the continuity of the mobile phone time in any state, and the conventional 32KHz clock source is usually formed by matching an external 32KHz Crystal oscillator with an internal digital Compensation Crystal oscillator dcxo (digital Compensation Crystal oscillator). In order to save the hardware cost of mobile phone design, some mobile phone manufacturers directly adopt an internal DCXO to obtain a 32KHz clock source through digital frequency division, thereby omitting the use of an external 32KHz crystal oscillator and saving the hardware cost of mobile phone design.
In the process of implementing the present invention, the inventor finds that the following technical problems exist in the prior art in which the technical scheme of directly obtaining the 32KHz clock source by using the on-chip DCXO through digital frequency division:
when the mobile phone is in a connection mode, the internal DCXO can simultaneously output a 26MHz clock required by normal startup of the mobile phone and a 32KHz clock for maintaining the time continuity of the mobile phone, and the deviation of the output 32KHz clock is small; when the mobile phone is in an idle state (for example, a low power or deep sleep state), in order to save the power consumption of the mobile phone, the hardware may control the DCXO to close a bypass for outputting a 26MHz clock and only generate a 32KHz clock, and the deviation of the output 32KHz clock is large at this time, so that the time deviation of waking up of the mobile phone from the idle state is large, and the mobile phone cannot normally receive signals.
Disclosure of Invention
The time offset calibration method, the time offset calibration device and the mobile terminal provided by the invention can solve the problem of large time offset of waking up of the mobile phone from an idle state (such as a low-power or deep sleep state) caused by large offset of a 32KHz clock of the mobile phone, thereby ensuring that the mobile phone can normally receive signals.
In a first aspect, the present invention provides a method for calibrating time offset, including:
step one, when the mobile terminal is in an idle discontinuous receiving mode, trying different sampling points to blindly detect a physical broadcast channel signal around a wireless frame subframe 0;
recording the position of a sampling point of the first successfully detected physical broadcast channel signal, and recording the coordinate value of the position of the sampling point as the sampling point deviation;
thirdly, under the sampling point deviation, channel estimation is carried out according to a reference signal of a service cell where the mobile terminal is located;
step four, calculating the deviation of the temporary sampling point according to the result of the channel estimation, and comparing the deviation of the temporary sampling point with a preset value;
step five, when the deviation of the temporary sampling point is smaller than the preset value, calculating a deviation correction value, wherein the deviation correction value is equal to the sum of the recorded deviation of the sampling point and the deviation of the temporary sampling point; when the deviation of the temporary sampling points is not smaller than the preset value, reselecting the sampling points to blindly detect the physical broadcast channel signal;
repeating the steps for N times to obtain N sampling point deviation correction values, and averaging the N sampling point deviation correction values to obtain a calibrated time offset value;
and step seven, storing the time offset value to enable the mobile terminal to use the time offset value to carry out timing synchronization with the base station in a subsequent idle discontinuous reception period.
Optionally, before attempting to blindly detect the physical broadcast channel signal around the radio frame subframe 0 by different sampling points when the mobile terminal is in the idle discontinuous reception mode, the method further includes:
judging whether the mobile terminal enters a deep sleep state or not according to the reading of a radio frequency register in the mobile terminal; when the reading of the radio frequency register is 1, indicating that the mobile terminal enters a deep sleep state, and performing a time offset calibration process; and when the reading of the radio frequency register is 0, the mobile terminal does not enter a deep sleep state, and the time offset calibration process is not performed.
Optionally, the successful detection of the physical broadcast channel signal comprises:
and when the cyclic redundancy check code check result of the physical broadcast channel signal received under the sampling point deviation is correct, the signal detection is considered to be successful.
Optionally, after the saving the time offset value to enable the mobile terminal to perform timing synchronization with the base station using the time offset value in a subsequent idle discontinuous reception cycle, the method further includes:
continuously detecting whether the offset directions of M used time offset values are completely consistent or not, wherein the value of M is configured according to the actual situation;
if the deviation directions of the M used time deviation values are detected to be completely consistent, considering that the calibrated time deviation values have deviation, and reselecting sampling points to blindly detect the physical broadcast channel signals;
and if the deviation directions of the M used time deviation values are not consistent, the calibrated time deviation value is considered to be correct, and only channel estimation is carried out.
In a second aspect, the present invention provides a time offset calibration apparatus, including:
the first processing unit is used for trying different sampling points to blindly detect the physical broadcast channel signals around a wireless frame subframe 0 when the mobile terminal is in an idle discontinuous receiving mode;
the recording unit is used for recording the position of a first sampling point which can successfully detect the physical broadcast channel signal and recording the coordinate value of the position of the sampling point as the sampling point deviation;
the second processing unit is used for carrying out channel estimation according to the reference signal of the service cell where the mobile terminal is located under the sampling point deviation;
the comparison unit is used for calculating the deviation of the temporary sampling point according to the result of the channel estimation and comparing the deviation of the temporary sampling point with a preset value;
a first calculation unit for calculating a deviation correction value when the temporary sampling point deviation is smaller than the preset value, wherein the deviation correction value is equal to the sum of the recorded sampling point deviation and the temporary sampling point deviation; when the deviation of the temporary sampling points is not smaller than the preset value, reselecting the sampling points to blindly detect the physical broadcast channel signal;
the second calculation unit is used for acquiring N sampling point deviation correction values and averaging the N sampling point deviation correction values to obtain a calibrated time offset value;
and the synchronization unit is used for storing the time offset value so that the mobile terminal uses the time offset value to perform timing synchronization with the base station in a subsequent idle discontinuous reception period.
Optionally, the apparatus further comprises:
a judging unit, configured to, when the mobile terminal is in an idle discontinuous reception mode, before trying to blindly detect a physical broadcast channel signal around a radio frame subframe 0 at different sampling points, the first processing unit judges whether the mobile terminal enters a deep sleep state according to a reading of a radio frequency register in the mobile terminal; when the reading of the radio frequency register is 1, the mobile terminal is indicated to enter a deep sleep state, and a time offset calibration process is carried out; and when the reading of the radio frequency register is 0, the mobile terminal does not enter a deep sleep state, and the time offset calibration process is not performed.
Optionally, the successful detection of the physical broadcast channel signal comprises:
and when the cyclic redundancy check code check result of the physical broadcast channel signal received under the sampling point deviation is correct, the signal detection is considered to be successful.
Optionally, the apparatus further comprises:
a detection unit, configured to store the time offset value by the synchronization unit, so that after the mobile terminal performs timing synchronization with the base station using the time offset value in a subsequent idle discontinuous reception cycle, whether offset directions of M used time offset values are completely consistent is continuously detected, where a value of M is configured according to an actual situation;
a fifth processing unit, configured to, if it is detected that the offset directions of the M used time offset values are completely consistent, consider that there is an offset in the calibrated time offset value, and reselect a sampling point to blindly detect the physical broadcast channel signal;
a sixth processing unit, configured to, if it is detected that the offset directions of the M used time offset values are not consistent, consider that the calibrated time offset value is correct, and perform only channel estimation.
In a third aspect, the present invention provides a mobile terminal, which includes the above time offset calibration apparatus.
According to the time offset calibration method, the time offset calibration device and the mobile terminal provided by the embodiment of the invention, different sampling points are tried in an idle discontinuous receiving mode to blindly detect the physical broadcast channel signal around the radio frame subframe 0, the sampling points capable of solving the physical broadcast channel signal are subjected to small-range adjustment and verification, and the time offset value is configured in a subsequent idle discontinuous receiving period, so that the problem of large time deviation of the wake-up of the mobile phone from the idle state (such as a low power or deep sleep state) caused by large 32KHz clock deviation of the mobile phone can be solved, and the mobile phone can be ensured to normally receive the signal.
Drawings
FIG. 1 is a flow chart of a time offset calibration method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a time offset calibration method according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a time offset calibration apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a time offset calibration apparatus according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a time offset calibration method, as shown in fig. 1, the method comprises:
s11, when the mobile terminal is in the idle discontinuous reception mode, trying different sampling points to blindly detect the physical broadcast channel signal around the wireless frame sub-frame 0;
s12, recording the position of a sampling point of the first successfully detected physical broadcast channel signal, and recording the coordinate value of the position of the sampling point as the deviation of the sampling point;
s13, under the sampling point deviation, carrying out channel estimation according to the reference signal of the service cell where the mobile terminal is located;
s14, calculating the deviation of the temporary sampling points according to the result of the channel estimation, and comparing the deviation of the temporary sampling points with a preset value;
s15, when the deviation of the temporary sampling point is smaller than the preset value, calculating a deviation correction value, wherein the deviation correction value is equal to the sum of the deviation of the recorded sampling point and the deviation of the temporary sampling point; when the deviation of the temporary sampling points is not smaller than the preset value, reselecting the sampling points to blindly detect the physical broadcast channel signal;
s16, repeating the steps for N times to obtain N sampling point deviation correction values, and averaging the N sampling point deviation correction values to obtain a calibrated time deviation value;
and S17, storing the time offset value, so that the mobile terminal uses the time offset value to perform timing synchronization with the base station in a subsequent idle discontinuous reception period.
Optionally, after the mobile terminal is powered on, receiving signals at several center frequency points where LTE cells may exist, and determining whether cells may exist around the frequency points according to the strength of the received signals;
optionally, if the mobile terminal does not store the frequency point and operator information when the mobile terminal is powered off last time, it needs to perform full-band scanning in the frequency band range divided into the LTE system, find the frequency point with a stronger signal to try, and then receive the primary synchronization signal around this central frequency point, where the primary synchronization signal is repeatedly sent on subframe 0 with 5ms as a period, and can determine a 5ms time slot boundary, and after 5ms time slot synchronization, it can determine a 10ms boundary, that is, the position of subframe 0, by receiving two secondary synchronization signals, and demodulating the physical broadcast channel signal at the position of subframe 0, it can know the sampling point deviation;
according to the time offset calibration method provided by the embodiment of the invention, different sampling points are tried in an idle state discontinuous receiving mode to blindly detect the physical broadcast channel signal around the wireless frame subframe 0, the sampling points capable of solving the physical broadcast channel signal are subjected to small-range adjustment and verification, and the time offset value is configured in a subsequent idle state discontinuous receiving period, so that the problem of large time offset of the wake-up of the mobile phone from the idle state (such as low power or deep sleep state) caused by large 32KHz clock offset of the mobile phone can be solved, and the mobile phone can be ensured to normally receive the signal.
Optionally, as shown in fig. 2, before attempting to blindly detect the physical broadcast channel signal around the radio frame subframe 0 by different sampling points when the mobile terminal is in the idle discontinuous reception mode, the method further includes:
s18, judging whether the mobile terminal enters a deep sleep state or not according to the reading of the radio frequency register in the mobile terminal; when the reading of the radio frequency register is 1, indicating that the mobile terminal enters a deep sleep state, and performing a time offset calibration process; and when the reading of the radio frequency register is 0, the mobile terminal does not enter a deep sleep state, and the time offset calibration process is not performed.
Optionally, the successful detection of the physical broadcast channel signal comprises:
and when the cyclic redundancy check code check result of the physical broadcast channel signal received under the sampling point deviation is correct, the signal detection is considered to be successful.
Optionally, after the saving the time offset value to enable the mobile terminal to perform timing synchronization with the base station using the time offset value in a subsequent idle discontinuous reception cycle, the method further includes:
continuously detecting whether the offset directions of M used time offset values are completely consistent or not, wherein the value of M is configured according to the actual situation;
if the deviation directions of the M used time deviation values are detected to be completely consistent, considering that the calibrated time deviation values have deviation, and reselecting sampling points to blindly detect the physical broadcast channel signals;
and if the deviation directions of the M used time deviation values are not consistent, the calibrated time deviation value is considered to be correct, and only channel estimation is carried out.
An embodiment of the present invention further provides a time offset calibration apparatus, as shown in fig. 3, the apparatus includes:
a first processing unit 11, configured to try different sampling points to blindly detect a physical broadcast channel signal around a radio frame subframe 0 when the mobile terminal is in an idle discontinuous reception mode;
the recording unit 12 is configured to record a first sampling point position where the physical broadcast channel signal can be successfully detected, and record a coordinate value of the sampling point position as a sampling point deviation;
a second processing unit 13, configured to perform channel estimation according to a reference signal of a serving cell in which the mobile terminal is located under the sampling point deviation;
a comparison unit 14, configured to calculate a temporary sampling point deviation according to the result of the channel estimation, and compare the temporary sampling point deviation with a preset value;
a first calculation unit 15 for calculating a deviation correction value when the temporary sampling point deviation is smaller than the preset value, wherein the deviation correction value is equal to the sum of the recorded sampling point deviation and the temporary sampling point deviation; when the deviation of the temporary sampling points is not smaller than the preset value, reselecting the sampling points to blindly detect the physical broadcast channel signal;
the second calculating unit 16 is configured to obtain N sampling point deviation correction values, and average the N sampling point deviation correction values to obtain a calibrated time offset value;
a synchronizing unit 17, configured to store the time offset value, so that the mobile terminal performs timing synchronization with the base station using the time offset value in a subsequent idle discontinuous reception period.
The time offset calibration device provided by the embodiment of the invention can solve the problem of large wake-up time offset of the mobile phone from the idle state (such as low power or deep sleep state) caused by large 32KHz clock offset of the mobile phone by trying different sampling points to blindly detect the physical broadcast channel signal around the wireless frame subframe 0 in the idle state discontinuous receiving mode, adjusting and verifying the sampling points capable of solving the physical broadcast channel signal in a small range, and configuring the time offset value in the subsequent idle state discontinuous receiving period, thereby ensuring that the mobile phone can normally receive the signal.
Optionally, as shown in fig. 4, the apparatus further includes:
a judging unit 18, configured to, when the mobile terminal is in an idle discontinuous reception mode, before trying to blindly detect a physical broadcast channel signal around a radio frame subframe 0 at different sampling points, the first processing unit judges whether the mobile terminal enters a deep sleep state according to a reading of a radio frequency register in the mobile terminal; when the reading of the radio frequency register is 1, the terminal enters a deep sleep state, and a time offset calibration process is carried out; and when the reading of the radio frequency register is 0, the mobile terminal does not enter a deep sleep state, and the time offset calibration process is not performed.
Optionally, the successful detection of the physical broadcast channel signal comprises:
and when the cyclic redundancy check code check result of the physical broadcast channel signal received under the sampling point deviation is correct, the signal detection is considered to be successful.
Optionally, the apparatus further comprises:
a detecting unit 19, configured to store the time offset value by the synchronizing unit, so that after the mobile terminal performs timing synchronization with the base station using the time offset value in a subsequent idle discontinuous reception cycle, it continuously detects whether offset directions of M used time offset values are completely consistent, where a value of M is configured according to an actual situation;
a fifth processing unit 20, configured to determine that the calibrated time offset value has a deviation if it is detected that the offset directions of the M used time offset values are completely consistent, and reselect a sampling point to blindly detect the physical broadcast channel signal;
a sixth processing unit 21, configured to, if it is detected that the offset directions of the M used time offset values are not consistent, consider that the calibrated time offset value is correct, and only perform channel estimation.
The embodiment of the invention also provides a mobile terminal which comprises the time offset calibration device.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method for time offset calibration, comprising:
step one, when the mobile terminal is in an idle discontinuous receiving mode, trying different sampling points to blindly detect a physical broadcast channel signal around a wireless frame subframe 0;
recording the position of a sampling point of the first successfully detected physical broadcast channel signal, and recording the coordinate value of the position of the sampling point as the sampling point deviation;
thirdly, under the sampling point deviation, channel estimation is carried out according to a reference signal of a service cell where the mobile terminal is located;
step four, calculating the deviation of the temporary sampling point according to the result of the channel estimation, and comparing the deviation of the temporary sampling point with a preset value;
step five, when the deviation of the temporary sampling point is smaller than the preset value, calculating a deviation correction value, wherein the deviation correction value is equal to the sum of the recorded deviation of the sampling point and the deviation of the temporary sampling point; when the deviation of the temporary sampling points is not smaller than the preset value, reselecting the sampling points to blindly detect the physical broadcast channel signal;
repeating the steps for N times to obtain N sampling point deviation correction values, and averaging the N sampling point deviation correction values to obtain a calibrated time offset value;
and step seven, storing the time offset value to enable the mobile terminal to use the time offset value to carry out timing synchronization with the base station in a subsequent idle discontinuous reception period.
2. The method of claim 1, wherein before attempting to blindly detect the physical broadcast channel signal around radio frame subframe 0 at different sampling points when the mobile terminal is in the idle discontinuous reception mode, the method further comprises:
judging whether the mobile terminal enters a deep sleep state or not according to the reading of a radio frequency register in the mobile terminal; when the reading of the radio frequency register is 1, indicating that the mobile terminal enters a deep sleep state, and performing a time offset calibration process; and when the reading of the radio frequency register is 0, the mobile terminal does not enter a deep sleep state, and the time offset calibration process is not performed.
3. The method of claim 2, wherein the successful detection of the physical broadcast channel signal comprises:
and when the cyclic redundancy check code check result of the physical broadcast channel signal received under the sampling point deviation is correct, the signal detection is considered to be successful.
4. The method according to claim 2, wherein after said saving the time offset value to enable the mobile terminal to perform timing synchronization with the base station using the time offset value in a subsequent idle discontinuous reception period, further comprising:
continuously detecting whether the offset directions of M used time offset values are completely consistent or not, wherein the value of M is configured according to the actual situation;
if the deviation directions of the M used time deviation values are detected to be completely consistent, considering that the calibrated time deviation values have deviation, and reselecting sampling points to blindly detect the physical broadcast channel signals;
and if the deviation directions of the M used time deviation values are not consistent, the calibrated time deviation value is considered to be correct, and only channel estimation is carried out.
5. A time offset calibration device, comprising:
the first processing unit is used for trying different sampling points to blindly detect the physical broadcast channel signals around a wireless frame subframe 0 when the mobile terminal is in an idle discontinuous receiving mode;
the recording unit is used for recording the position of a sampling point of the physical broadcast channel signal which is successfully detected firstly, and recording the coordinate value of the position of the sampling point as the sampling point deviation;
the second processing unit is used for carrying out channel estimation according to the reference signal of the service cell where the mobile terminal is located under the sampling point deviation;
the comparison unit is used for calculating the deviation of the temporary sampling point according to the result of the channel estimation and comparing the deviation of the temporary sampling point with a preset value;
a first calculation unit for calculating a deviation correction value when the temporary sampling point deviation is smaller than the preset value, wherein the deviation correction value is equal to the sum of the recorded sampling point deviation and the temporary sampling point deviation; when the deviation of the temporary sampling points is not smaller than the preset value, reselecting the sampling points to blindly detect the physical broadcast channel signal;
the second calculation unit is used for acquiring N sampling point deviation correction values and averaging the N sampling point deviation correction values to obtain a calibrated time offset value;
a synchronization unit, configured to store the time offset value, so that the mobile terminal performs timing synchronization with a base station using the time offset value in a subsequent idle discontinuous reception period;
the device further comprises: a judging unit, configured to, when the mobile terminal is in an idle discontinuous reception mode, before trying to blindly detect a physical broadcast channel signal around a radio frame subframe 0 at different sampling points, the first processing unit judges whether the mobile terminal enters a deep sleep state according to a reading of a radio frequency register in the mobile terminal; when the reading of the radio frequency register is 1, the mobile terminal is indicated to enter a deep sleep state, and a time offset calibration process is carried out; and when the reading of the radio frequency register is 0, the mobile terminal does not enter a deep sleep state, and the time offset calibration process is not performed.
6. The apparatus of claim 5, wherein the successful detection of the physical broadcast channel signal comprises:
and when the cyclic redundancy check code check result of the physical broadcast channel signal received under the sampling point deviation is correct, the signal detection is considered to be successful.
7. The apparatus of claim 5, further comprising:
a detecting unit, configured to store the time offset value by the synchronizing unit, so that after the mobile terminal performs timing synchronization with the base station using the time offset value in a subsequent idle discontinuous reception cycle, it continuously detects whether offset directions of M used time offset values are completely consistent, where a value of M is configured according to an actual situation;
a fifth processing unit, configured to, if it is detected that the offset directions of the M used time offset values are completely consistent, consider that there is an offset in the calibrated time offset value, and reselect a sampling point to blindly detect the physical broadcast channel signal;
a sixth processing unit, configured to, if it is detected that the offset directions of the M used time offset values are not consistent, consider that the calibrated time offset value is correct, and perform only channel estimation.
8. A mobile terminal, characterized in that it comprises a time offset calibration device according to any of claims 5 to 7.
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