CN115580922A - Time keeping method and system based on base station time service - Google Patents
Time keeping method and system based on base station time service Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The embodiment of the invention provides a time-keeping method and a time-keeping system based on base station time service, which are applied to a time service terminal, wherein the time-keeping method based on the base station time service comprises the following steps: acquiring a current network connection state; when the current network connection state is abnormal, acquiring the current temperature of the clock crystal; extracting a target counting compensation value corresponding to the current temperature of the acquired clock crystal according to the preset corresponding relation between the temperature of the clock crystal and the counting compensation value; adjusting a local clock according to the target counting compensation value; the invention also discloses a time keeping system based on the base station time service, which is used for implementing the scheme and solves the problem of low time keeping precision caused by the fact that the time service terminal cannot acquire high-precision time from the base station under the condition of losing network connection in the time keeping technology in certain implementation processes.
Description
Technical Field
The embodiment of the invention relates to the field of clock control, in particular to but not limited to a time keeping method and system based on base station time service.
Background
At present, most of time service equipment acquires a high-precision clock through a satellite and outputs the clock through a second pulse or an IRIG-B coding format. Such devices are typically expensive and their time keeping techniques typically save calibrated time by using a high precision local clock, such as an atomic clock or an oven controlled crystal. In the case of a highly accurate calibration clock, a high accuracy settling time is maintained by a local high accuracy clock, such as an atomic clock or an oven controlled crystal. The clock scheme adopted by the existing terminal product is generally a TCXO (clock control oscillator) scheme, the clock precision is about 1ppm, namely the precision is one millionth, which means that 1 second has a time error of about 1us, and the error becomes larger and larger along with the accumulation of time, so that the requirement that the precision is smaller than 10us when the terminal product is timed every hour is far from being met. However, the use of high-precision clocks in end products, such as the clock scheme using rubidium atomic clocks, is too costly and too large in size, and is not likely to be used in end products. Therefore, when the time service terminal loses network connection, the time service terminal cannot acquire high-precision time from the base station, and the time service terminal has low time keeping precision, which is a problem to be solved urgently.
Disclosure of Invention
The embodiment of the invention provides a time keeping method and system based on base station time service, which mainly solve the technical problem that in the time keeping technology, a time service terminal cannot acquire high-precision time from a base station under the condition of losing network connection, so that the time keeping precision is too low.
The embodiment of the invention provides a time-keeping method based on base station time service, which is applied to a time service terminal and comprises the following steps:
acquiring a current network connection state;
when the current network connection state is abnormal, acquiring the current temperature of the clock crystal;
extracting a target counting compensation value corresponding to the current temperature of the acquired clock crystal according to the preset corresponding relation between the temperature of the clock crystal and the counting compensation value;
and adjusting a local clock according to the target counting compensation value.
The invention also provides a time keeping system based on the base station time service, which comprises:
the network acquisition module is used for acquiring the current network connection state;
the temperature acquisition module is used for acquiring the current temperature of the clock crystal when the current network connection state is abnormal;
the counting compensation value calculating module is used for extracting a target counting compensation value corresponding to the acquired current temperature according to the preset corresponding relation between the temperature of the clock crystal and the counting compensation value;
and the clock adjusting module is used for adjusting the local clock according to the target counting compensation value.
The invention has the advantages that the corresponding relation is preset:
the embodiment of the invention provides a time keeping method based on base station time service, which comprises the following steps: acquiring a current network connection state; when the current network connection state is abnormal, acquiring the current temperature of the clock crystal; extracting a target counting compensation value corresponding to the current temperature of the obtained clock crystal according to the preset corresponding relation between the temperature of the clock crystal and the counting compensation value; adjusting a local clock according to the target counting compensation value; in some implementation processes, the influence of the temperature on the clock deviation is compensated by extracting the target counting compensation value corresponding to the acquired current temperature according to the preset corresponding relation between the temperature of the clock crystal and the counting compensation value, and the problem that in the time keeping technology, the time keeping precision is too low due to the fact that the time keeping precision is not obtained from the base station under the condition that the time service terminal loses network connection is solved.
Additional features and corresponding advantages of the invention are set forth in the description which follows, and it is understood that at least some of the advantages will be apparent from the description of the invention.
Drawings
Fig. 1 is a schematic flowchart of a time keeping method based on base station time service according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a terminal time service workflow provided in an embodiment of the present invention;
fig. 3 is a schematic diagram of a network time service stage according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a time-keeping system based on base station time service according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The first embodiment is as follows:
in order to solve the problem of low time keeping precision caused by the fact that a time service terminal cannot acquire high-precision time from a base station under the condition that network connection is lost in the time keeping technology, the embodiment of the invention provides a time keeping method based on base station time service. Fig. 1 is a flowchart illustrating a time keeping method based on base station time service according to an embodiment of the present invention, where the method may include, but is not limited to, the following operations.
S101: and acquiring the current network connection state.
The 5G base station time service is an emerging technology at present, is mainly applied to the power industry at present, and is a key application of the 5G technology. At present, the national electric power is in close cooperation with operators and equipment vendors, and the application of the 5G time service technology is promoted. In addition, compared with the satellite time service technology adopted by the existing electric power and the transmission scheme of optical fibers, the method has the advantages of simple realization technology, easy equipment installation and networking and the like. However, when the scheme of base station timing is adopted again, the base station network may be abnormal, and in this case, in order to not affect the operation of the time service device, it is necessary to output a high-precision timing time, that is, to realize high-precision timing. At present, 10us/h is generally required.
The embodiment of the invention can adopt a clock scheme commonly used by a terminal Modem product, such as a TCXO (Temperature compensated X' total quartz crystal resonator) scheme to realize the time keeping function of the time service device. The core of the time-keeping function is that a clock source with high stability is needed, and the precision of a general TCXO is about 1ppm, which cannot meet the current time-keeping requirement. The time keeping requirement is within 12 hours, the time keeping deviation is within 10us/h, and the required clock stability is about 0.001 ppm.
Aiming at a clock scheme adopted by a time service terminal, such as TCXO and the like, the deviation between different crystals can be relatively large, the difference within 1ppm is a normal condition, the difference is mainly caused by the difference of different cutting angles of a quartz wafer during production, but the frequency stability of the individual clock crystal under the same environment can be 0.001 ppm. The crystal frequencies of the individuals actually deviate somewhat if temperature considerations are taken into account. Because the clock crystal is located on the mainboard, although the ambient temperature basically does not change in the same time period, the temperature of the clock crystal can change due to the change of the load of the mainboard when the mainboard works. Since the frequency and temperature profiles of the crystal are substantially fixed (over a period of time, such as a day, in which case aging of the crystal need not be considered), we can read the temperature of the crystal and the difference between the local clock count and the synchronous base station clock count every second in the case of network lock and normal operation, so that during operation, learning is continuously performed and a look-up table of crystal temperature and clock offset is formed cumulatively. When the network is lost and the time-keeping operation is needed, the closest counting compensation value is searched from the lookup table according to the crystal temperature of the current second, and the local clock time is compensated by adopting the compensation value, so that the precision basically close to the base station time can be obtained, and the time-keeping precision requirement is met.
And S102, acquiring the current temperature of the clock crystal when the current network connection state is abnormal.
Namely, under the condition of connecting the 5G base station, the terminal can acquire high-precision Time from a message frame of the 5G base station to synchronize the Time of a local RTC (Real _ Time Clock), and then performs coding of IRIG-B and outputs the IRIG-B for Time service for the back-end equipment. However, if the connection with the base station is lost, the time keeping function can only be realized by using local time, and in order to ensure that the operation of the rear-end time-served device is not affected, the requirement for the time keeping precision needs to be provided, for example, 10us/h. Normally, the local clock accuracy is not satisfactory, and a deviation of 10us is reached in substantially 10 seconds when calculated with an accuracy of 1 ppm. The frequency stability of the clock crystal varies with temperature and time (aging rate), and temperature compensation needs to be considered because timekeeping requires only a period of time, such as 12 hours, during which the effect of temperature is dominant.
Therefore, when the current network connection state is judged to be abnormal, the current temperature of the clock crystal is acquired, and the temperature compensation is considered.
And S103, extracting a target counting compensation value corresponding to the current temperature of the obtained clock crystal according to the preset corresponding relation between the temperature of the clock crystal and the counting compensation value.
And S104, adjusting a local clock according to the target counting compensation value.
Adjusting the local clock according to the target count compensation value comprises: the counting value of one second of the local clock theory plus the counting compensation value is taken as the counting value of the next integer second and is written into the local clock; after the adjusting the local clock according to the target count compensation value, the method further comprises: and carrying out IRIG-B encoding and IRIG-B encoding output according to the local clock and the counter.
It should be understood that before the step 101 of acquiring the current network connection state, the method further includes: under the condition that the network connection state is normal, a schematic diagram of a terminal time service workflow, as shown in fig. 2, may include:
s201: the terminal is directly connected with the base station to acquire the time service information.
S202: and setting a high-precision clock acquired from the message frame to a local clock at the frame boundary of the time service message.
S203: encoding of IRIG-B (Inter-range instrumentation group, type B format) codes is initiated at integer seconds of the local clock and produces an integer number of seconds of rising edges.
S204: and outputting the coded IRIG-B code through a driving circuit.
It should be understood that, in step S103, the terminal needs to store the correspondence between the temperature of the clock crystal and the count compensation value in advance. Fig. 3 is a schematic diagram of a network time service phase work flow provided in an embodiment of the present invention, which may include:
s301: the network authorization is initiated.
S302: frequency multiplication is carried out on the local clock to be used as a reference clock of the local counter;
it should be understood that the local clock may be multiplied by PPL (Phase Locked Loop).
S303: and starting the counter to count when the local clock acquires the starting time of one second pulse from the network side, stopping the counter to count when the local clock acquires the starting time of the next second pulse from the network side, and recording the value of the current counter.
Determining a counting compensation value of local time and base station time according to the value of the current counter and the frequency of the reference clock; it should be understood that the local clock acquires the start time of one second pulse from the network side, starts the counter to count, stops the counter to count at the start time of the next second pulse acquired from the network side by the local clock, and records the current counter value as the actual one second count value, which has an error from the theoretical one second count value. And the count value within one second is directly read according to the frequency of the reference clock, namely, the count value within one second of the local clock can be used as the theoretical count value. There is an error between the count value of the last second and the count value of the theoretical second, i.e., the count offset value of the local time and the base station time, which may be positive or negative.
S304: and reading the temperature of the clock crystal when the counter stops counting, and writing the counting compensation value and the corresponding temperature into a preset corresponding relation.
It should be understood that, in the embodiment of the present invention, in the phase of time service performed by connecting to the base station, the timer deviation between the crystal temperature and the local clock and the base station clock is continuously obtained, and a mapping table of the count compensation value and the temperature is formed. When the connection with the base station is lost and the time keeping is needed, the RTC time is compensated every second by adopting the mapping table obtained by early learning, so that the requirement on the time keeping precision is met. Since learning is ongoing, this frequency to temperature mapping table is always closest to the current state of the clock crystal. And when the product leaves the factory, the product can traverse each temperature, such as the working range of-40 ℃ to 70 ℃, to obtain the counting compensation values at different temperatures.
S305: and judging whether the network is normal or not, if so, turning to S303, and if not, turning to S306.
S306: local clock compensation is initiated.
In an embodiment of the present invention, the extracting, according to the preset corresponding relationship between the temperature of the clock crystal and the count compensation value, the target count compensation value corresponding to the current temperature of the obtained clock crystal according to the preset corresponding relationship between the temperature of the clock crystal and the count compensation value includes: and acquiring counting compensation values of two groups of temperatures which are most adjacent to the current temperature of the clock crystal from the preset corresponding relation, and performing weighted average to acquire a target counting compensation value corresponding to the current temperature of the clock crystal. The counting compensation values of two groups of temperatures which are most adjacent to the current temperature of the clock crystal are obtained, weighted average is carried out to obtain a target counting compensation value corresponding to the current temperature of the clock crystal, and the calculation mode is as follows:
the temperature of the clock crystal is Ti, the counting compensation values delta i corresponding to the temperature of the clock crystal, the two groups of temperatures which are most adjacent to the temperature of the clock crystal are Ti-1 and Ti +1 respectively, and the counting compensation values corresponding to the two groups of temperatures which are synchronously searched are delta i-1 and delta i +1 respectively.
It should be understood that if the current temperature of the clock crystal can be directly found in the preset corresponding relationship, the count compensation value corresponding to the current temperature is directly used as the target count compensation value.
According to the time keeping method based on the base station time service provided by the embodiment of the invention, the current network connection state is obtained; when the current network connection state is abnormal, acquiring the current temperature of the clock crystal; extracting a target counting compensation value corresponding to the current temperature of the acquired clock crystal according to the preset corresponding relation between the temperature of the clock crystal and the counting compensation value; adjusting a local clock according to the target counting compensation value; the influence of the temperature on the clock deviation is compensated by extracting the target counting compensation value corresponding to the acquired current temperature according to the preset corresponding relation between the temperature of the clock crystal and the counting compensation value, and the problem that the time keeping precision is too low due to the fact that the time service terminal cannot acquire high-precision time from a base station under the condition that the network connection is lost in the time keeping technology is solved.
Example two:
in order to solve the problem of low time keeping precision caused by the fact that a time service terminal cannot acquire high-precision time from a base station under the condition that network connection is lost in the time keeping technology, the embodiment of the invention provides a time keeping method based on base station time service. Fig. 4 is a schematic structural diagram of a time-keeping system based on base station time service according to a second embodiment of the present invention, so as to implement the time-keeping method based on base station time service according to the first embodiment; the time keeping system 40 based on base station timing may include the following modules.
A network obtaining module 401, configured to obtain a current network connection state.
A temperature obtaining module 402, configured to obtain a current temperature of the clock crystal when the current network connection state is abnormal.
And a count compensation value calculation module 403, configured to extract, according to the preset corresponding relationship between the temperature of the clock crystal and the count compensation value, a target count compensation value corresponding to the obtained current temperature according to the preset corresponding relationship.
And a clock adjusting module 404, configured to adjust a local clock according to the target count compensation value.
Wherein, the extracting the target count compensation value corresponding to the current temperature of the obtained clock crystal according to the preset corresponding relationship between the temperature of the clock crystal and the count compensation value comprises: and acquiring counting compensation values of two groups of temperatures which are most adjacent to the current temperature of the clock crystal from the preset corresponding relation, and performing weighted average to acquire a target counting compensation value corresponding to the current temperature of the clock crystal.
The invention provides a time keeping device based on base station time service, which comprises: the network acquisition module is used for acquiring the current network connection state; the temperature acquisition module is used for acquiring the current temperature of the clock crystal when the current network connection state is abnormal; the counting compensation value calculating module is used for extracting a target counting compensation value corresponding to the acquired current temperature according to the preset corresponding relation between the temperature of the clock crystal and the counting compensation value; the clock adjusting module is used for adjusting a local clock according to the target counting compensation value; the influence of the temperature on the clock deviation is compensated by extracting the target counting compensation value corresponding to the acquired current temperature according to the preset corresponding relation between the temperature of the clock crystal and the counting compensation value, and the problem that the time keeping precision is too low because the time service terminal cannot acquire high-precision time from a base station under the condition of losing network connection in the time keeping technology is solved.
It will be apparent to those skilled in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software (which may be implemented as computer program code executable by a computing device), firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit.
In addition, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, computer program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media. Thus, the present invention is not limited to any specific combination of hardware and software.
The foregoing is a more detailed description of embodiments of the present invention, and the present invention is not to be considered limited to such descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A time keeping method based on base station time service is applied to a time service terminal, and is characterized by comprising the following steps:
acquiring a current network connection state;
when the current network connection state is abnormal, acquiring the current temperature of the clock crystal;
extracting a target counting compensation value corresponding to the acquired current temperature according to a preset corresponding relation between the temperature of the clock crystal and the counting compensation value;
and adjusting a local clock according to the target counting compensation value.
2. The time keeping method based on base station time service of claim 1, wherein the extracting the target count compensation value corresponding to the obtained current temperature according to the preset corresponding relationship between the temperature of the clock crystal and the count compensation value comprises: and acquiring counting compensation values of two groups of temperatures which are most adjacent to the current temperature of the clock crystal from the preset corresponding relation, and performing weighted average to acquire a target counting compensation value corresponding to the current temperature of the clock crystal.
3. The time keeping method based on base station time service as claimed in claim 2, wherein the count compensation values of two groups of temperatures nearest to the current temperature of the clock crystal are obtained, and weighted average is performed to obtain the target count compensation value corresponding to the current temperature of the clock crystal, and the calculation method is as follows:
the temperature of the clock crystal is Ti, the counting compensation values delta i corresponding to the temperature of the clock crystal, the two groups of temperatures which are most adjacent to each other are Ti-1 and Ti +1 respectively, and the counting compensation values corresponding to the two groups of temperatures which are synchronously searched are delta i-1 and delta i +1 respectively.
4. The base station time service based time keeping method according to claim 1, wherein the obtaining the current network connection state further comprises:
when the current network connection state is normal, the connection base station acquires time service information;
and setting a high-precision clock acquired from the message frame to a local clock at the frame boundary of the time service message.
5. The method for keeping time based on time service of claim 4, wherein said setting a high precision clock obtained from a message frame to a local clock at a frame boundary of said time service message further comprises:
multiplying the local clock to be used as a reference clock of a local counter;
the method comprises the steps that a counter is started to count when a local clock acquires the starting time of one second pulse from a network side, the counter stops counting when the local clock acquires the starting time of the next second pulse from the network side, and the value of the current counter is recorded;
determining a counting compensation value of local time and base station time according to the value of the current counter and the frequency of the reference clock; and reading the temperature of the clock crystal when the counter stops counting, and writing the counting compensation value and the corresponding temperature into a preset corresponding relation.
6. The base station time service based time keeping method according to claim 5, wherein the frequency multiplication of the local clock comprises: and realizing the frequency multiplication of the clock by the local clock through a phase-locked loop.
7. The base station time service based time keeping method according to any one of claims 1-6, wherein the adjusting the local clock according to the target count compensation value comprises: and adding the count compensation value to the count value of one theoretical second of the local clock to be used as the count value of the next integer second, and writing the count value into the local clock.
8. The method for keeping time based on base station time service according to any one of claims 1-6, wherein after adjusting the local clock according to the target count compensation value, the method further comprises: and carrying out IRIG-B encoding and IRIG-B encoding output according to the local clock and the counter.
9. A time keeping system based on base station time service is characterized by comprising:
the network acquisition module is used for acquiring the current network connection state;
the temperature acquisition module is used for acquiring the current temperature of the clock crystal when the current network connection state is abnormal;
the counting compensation value calculating module is used for extracting a target counting compensation value corresponding to the acquired current temperature according to the preset corresponding relation between the temperature of the clock crystal and the counting compensation value;
and the clock adjusting module is used for adjusting a local clock according to the target counting compensation value.
10. The base station time service based time keeping system of claim 9, wherein the count offset calculation module is specifically configured to: and acquiring counting compensation values of two groups of temperatures which are most adjacent to the current temperature of the clock crystal from the preset corresponding relation, and performing weighted average to acquire a target counting compensation value corresponding to the current temperature of the clock crystal.
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