CN113126478A - 5G network clock synchronization method based on multiple time service systems - Google Patents
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Abstract
The invention discloses a 5G network clock synchronization method based on various time service systems, which adopts a Beidou navigation system and a GPS as clock sources of a synchronization network, and a time keeping module outputs clock signals based on the clock sources; respectively acquiring 1PPS signals of a GPS and a Beidou navigation system, and respectively comparing the acquired 1PPS signals with the 1PPS signals output by the time keeping module to determine a first clock error and a second clock error; determining the timekeeping state of the system according to the collected GPS and 1PPS signals of the Beidou navigation system, and determining the clock error of the system according to the timekeeping state; and inputting the determined clock error and the clock source into the data processing module for verification to determine the final clock signal of the time keeping module. According to the invention, the time-keeping state is autonomously determined by constructing a time synchronization networking model according to the signal quality of the Beidou navigation system and the GPS, so that the autonomous controllability of the 5G time synchronization networking is ensured, and the 5G clock synchronization networking is stably and efficiently operated under the support of various time service systems.
Description
Technical Field
The invention belongs to the technical field of 5G mobile communication, and relates to a 5G network clock synchronization method based on various time service systems.
Background
Information communication is one of the fastest-developing fields in the current society, the process of building a 5G network by each operator is accelerated, and building a 5G commercial network is urgently needed before 2020. Compared with the 4G network era, the 5G era has the following new synchronization requirement characteristics:
1. the synchronization requirement precision is higher, and the base station directly meets the requirement through single-station time service of a common satellite receiver.
2. The synchronous application scene is more complex, and with the development of the urbanization in China and the increase of indoor base stations, a large number of 5G base station deployment scenes which cannot acquire satellite signals exist.
3. The safety and reliability of synchronization are more strict, and the situation that the satellite fails due to unintentional or intentional interference happens occasionally, so that the potential safety hazard is generated when the 5G synchronization completely depends on satellite time service.
4. The cost is more sensitive, the 5G base stations are deployed strongly, and if each base station is additionally provided with a satellite receiver, the equipment and investment cost is huge.
In view of the above analysis, in order to meet the synchronization requirement of the 5G system, improve the time service precision, solve the blind spot problem of satellite coverage, improve the safety and reliability, and solve the construction and operation and maintenance costs, it is necessary to establish an autonomous, controllable, safe and reliable high-precision time synchronization networking.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an autonomous controllable, safe and reliable high-precision 5G time synchronization networking.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention provides a 5G network clock synchronization method based on various time service systems, which is characterized in that the various time service systems are Beidou/GPS double-star time service systems, a Beidou navigation system and a GPS are adopted as clock sources of a synchronization network, and the method comprises the following steps:
the time keeping module outputs a clock signal based on a clock source; respectively acquiring 1PPS signals of a GPS and a Beidou navigation system, and respectively comparing the acquired 1PPS signals with the 1PPS signals output by the time keeping module to determine a first clock error and a second clock error;
determining a timekeeping state of the system according to the collected 1PPS signals of the GPS and the Beidou navigation system, and determining a system clock error according to the timekeeping state, wherein the system clock error comprises a first clock error or a second clock error;
and inputting the determined clock error and the clock source into the data processing module for verification to determine the final clock signal of the time keeping module.
Further, the method of determining the first clock error and the second clock error comprises:
s1: the time keeping module receives 1PPS signals of the GPS and the Beidou navigation system respectively and generates 1PPS signals which are earlier than the 1PPS signals of the GPS and the Beidou navigation system by a preset time delta t respectively;
s2: the errors of two adjacent sets of periods T are stored consecutively:
clock error between 1PPS signal of GPS and 1PPS signal generated by time keeping module;
clock error between the 1PPS signal of the Beidou navigation system and the 1PPS signal generated by the time keeping module.
And respectively calculating the average value of the clock errors in the step (i) and the step (ii), and recording the average value as a first clock error T1 and a second clock error T2.
Further, the method for determining the time keeping state of the system according to the collected 1PPS signals of the GPS and the Beidou navigation system comprises the following steps:
after the system is powered on and operated, 1PPS signals generated by a GPS system and a Beidou navigation system are detected respectively;
if the 1PPS signals of the GPS and the Beidou navigation system pass the detection, entering a timekeeping state 1, and taking the GPS system signal as a timekeeping reference signal and the Beidou navigation system signal as a standby timekeeping signal; if only the 1PPS signal of the GPS passes the detection, entering a time-keeping state 2, and taking the GPS signal as a time-keeping reference signal;
if only the 1PPS signal of the Beidou navigation system passes the detection, the Beidou navigation system enters a timekeeping state 3, and the Beidou navigation system signal is used as a timekeeping reference signal;
and if the GPS signal and the Beidou navigation signal cannot be received at the same time, the system enters an internal timekeeping state.
Still further, the method also comprises the switching of the punctuality state, and the specific switching method is as follows:
in the time keeping state 1, if the GPS and Beidou navigation system signals exist all the time, the GPS signal is used as a time keeping reference signal; if the GPS signal and the Beidou navigation signal cannot be received at the same time, the system enters an internal timekeeping state; if the Beidou navigation signal is only lost, entering a timekeeping state 2, and continuously adopting a GPS signal as a timekeeping reference signal; if only the GPS signal is lost, entering a timekeeping state 3, and taking a Beidou navigation system signal as a timekeeping reference signal at the moment;
after entering the time keeping state 2, a GPS signal is used as a time keeping reference signal, and if a Beidou navigation system signal is received, the time keeping state 1 is entered; if the GPS signal is lost, the internal timekeeping state is entered;
after entering a timekeeping state 3, a Beidou navigation system signal is adopted as a timekeeping reference signal; if a GPS signal is received, entering a timekeeping state 1; if the Beidou navigation system signal is lost, the Beidou navigation system enters an internal timekeeping state;
the GPS and Beidou navigation system is in an internal timekeeping state, and if 1PPS signals of the GPS and the Beidou navigation system are received at the same time, the GPS and Beidou navigation system enter the timekeeping state 1; if only receiving the 1PPS signal of the GPS, entering a timekeeping state 2; if only the 1PPS signal of the Beidou navigation system is received, the state of keeping watch is entered into 3.
Further, the method for determining whether to adopt the first clock error or the second clock error as the system clock error according to the time keeping state is as follows:
if the clock is in the punctuality state 1 and the punctuality state 2, the first clock error T1 is used as the system clock error through the serial port according to the agreed frame protocol; in the time-keeping state 3, the second clock error T2 is regarded as the system clock error.
Still further, the clock error determined last time is taken as the system clock error in the internal timekeeping state.
Furthermore, the big dipper/GPS double-star time service system is provided with an interface directly interconnected with the base station, and is used for realizing that the big dipper/GPS double-star time service system is just input as a base station clock source or an external clock.
Further, the interface automatically judges the type of the base station to realize protocol switching.
Further, the interface is used for transmitting 1PPS pulse signals and serial port time information.
The beneficial technical effects are as follows:
according to the method, a time synchronization networking model is established, a Beidou/GPS intelligent double-satellite time service system is used as a source, the method autonomously determines a time keeping state according to the signal quality of a Beidou navigation system and a GPS, autonomous controllability of the 5G time synchronization networking is ensured, and the 5G clock synchronization networking is enabled to operate stably and efficiently under the support of various time service systems;
the invention can further ensure that the timing information provided by other available satellite positioning systems is adopted to maintain the normal work of the system under the condition that one satellite fails by switching the time keeping state, thereby greatly improving the safety of the 5G high-precision time synchronization communication network.
Drawings
FIG. 1 is a schematic diagram of a 5G high-precision clock synchronization networking framework based on multiple time service systems according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a Beidou and GPS time service data generation process according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a mode switching process of the big dipper/GPS intelligent two-satellite system according to the 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 will be described in detail with reference to the accompanying drawings.
The invention discloses a 5G network clock synchronization method based on various time service systems, which is characterized in that a time synchronization networking model is built, a Beidou/GPS intelligent double-star time service system is used as a high-precision server of source equipment, when a satellite is unavailable, an optical fiber time service source tracing unit is adopted, and ultrahigh-precision time synchronization signals are obtained through the ground. The method ensures the autonomous controllability of the 5G time synchronization networking, ensures the stable and efficient operation of the 5G clock synchronization networking under the support of various time service systems,
in the embodiment, referring to fig. 1, the application of the big dipper/GPS intelligent dual-satellite time service system in a 5G clock synchronization networking has two modes, one mode is that the big dipper/GPS intelligent dual-satellite time service system is directly interconnected with a base station as a clock source of the base station, the other mode is that the big dipper/GPS intelligent dual-satellite time service system is connected with a ground synchronization network as a clock source of the ground synchronization network, clock information is provided to the base station through the ground synchronization network, and when a satellite is unavailable, an optical fiber time service source tracing is adopted to reach a national time keeping unit, and an ultrahigh precision.
The 5G network clock synchronization method based on multiple time service systems provided by the embodiment comprises the following steps:
the time keeping module outputs a clock signal based on a clock source; respectively acquiring 1PPS signals of a GPS and a Beidou navigation system, and respectively comparing the acquired 1PPS signals with the 1PPS signals output by the time keeping module to determine a first clock error and a second clock error;
determining a timekeeping state of the system according to the collected 1PPS signals of the GPS and the Beidou navigation system, and determining a system clock error according to the timekeeping state, wherein the system clock error comprises a first clock error or a second clock error; and inputting the determined clock error and the clock source into the data processing module for verification to determine the final clock signal of the time keeping module.
In the embodiment of the invention, an external base station mode is adopted when the Beidou/GPS intelligent double-star time service system is used as a base station clock source, and an interface between the intelligent double-star time service system and a base station is designed; when the Beidou/GPS intelligent double-satellite time service system is used as a clock source of a ground synchronous network, the 1PPS clock signal generates time offset after being transmitted by the ground synchronous network, so the integrity test of the 1PPS clock signal is designed, and the working mode, namely the time keeping state, of the Beidou/GPS time service system is determined according to the integrity test.
Referring to fig. 2, the big dipper/GPS intelligent dual-satellite time service system mainly comprises a big dipper receiving module, a GPS receiving module, a data processing module (the data processing module comprises a timekeeping module), an interface module and the like, and is designed to take the big dipper/GPS dual-system as a standby for each other and receive big dipper and GPS satellite signals at the same time. The intelligent double-satellite time service system can select an optimal satellite system according to satellite signals and output pulse per second 1PPS clock information, TOD time data information and the like, wherein the 1PPS signals are responsible for providing accurate time synchronization information.
The Beidou/GPS intelligent double-satellite time service system is used as a clock source of a ground synchronous network, and the invention designs a 1PPS signal integrity test to determine the timekeeping state of the system.
Referring to fig. 3, the integrity test of the Beidou/GPS intelligent two-satellite system 1PPS signal involved in the step A comprises the following steps:
s1: after the Beidou/GPS intelligent double-satellite system is powered on and operates, 1PPS signals generated by the two systems are detected respectively;
s2: if the 1PPS signals of the GPS or the Beidou navigation system pass through detection, the GPS or the Beidou navigation system navigation module is judged to work normally, the state of keeping time is entered to be 1, the GPS signals are used as the time keeping reference signals, and the Beidou navigation system signals are used as standby time keeping signals. If only the 1PPS signal of the GPS passes the detection, the GPS is judged to be normal and the Beidou navigation system is not normal, and then the state 2 of timekeeping is entered, and the GPS signal is used as a timekeeping reference signal. If only the 1PPS signal of the Beidou navigation system passes the detection, the Beidou navigation system signal is judged to be normal and the GPS signal is not normal, and then the Beidou navigation system enters a timekeeping state 3, and the Beidou navigation system signal is used as a timekeeping reference signal.
S3: in the time keeping state 1, if the GPS and Beidou navigation system signals exist all the time, the GPS signal is used as a time keeping reference signal; and if the GPS signal and the Beidou navigation signal cannot be received at the same time, the system enters an internal timekeeping state. If the Beidou navigation signal is only lost, the state 2 of timekeeping is entered, and the GPS signal is continuously adopted as the timekeeping reference signal. If only the GPS signal is lost, the system enters a timekeeping state 3, and the Beidou navigation system signal is adopted as a timekeeping reference signal at the moment.
S4: after entering the time keeping state 2, a GPS signal is used as a time keeping reference signal, and if a Beidou navigation system signal is received, the time keeping state 1 is entered; if the GPS signal is lost, an internal timekeeping state is entered.
S5: and after entering the timekeeping state 3, adopting a Beidou navigation system signal as a timekeeping reference signal. If a GPS signal is received, entering a timekeeping state 1; if the Beidou navigation system signal is lost, the Beidou navigation system enters an internal timekeeping state.
S6: the GPS and Beidou navigation system is in an internal timekeeping state, and if 1PPS signals of the GPS and the Beidou navigation system are received at the same time, the GPS and Beidou navigation system enter the timekeeping state 1; if only receiving the 1PPS signal of the GPS, entering a timekeeping state 2; if only the 1PPS signal of the Beidou navigation system is received, the state of keeping watch is entered into 3.
The specific embodiment also comprises the switching of the time keeping state, and the specific steps are as follows:
s1: the time keeping module receives 1PPS signals of the GPS and the Beidou navigation system respectively and generates 1PPS signals which are earlier than the 1PPS signals of the GPS and the Beidou navigation system by a preset time delta t respectively;
s2: the errors of two adjacent sets of periods T are stored consecutively: clock error between 1PPS signal of GPS and 1PPS signal generated by time keeping module; clock error between the 1PPS signal of the Beidou navigation system and the 1PPS signal generated by the time keeping module. And respectively calculating the average values of the clock errors in the step (i) and the step (ii), and recording the average values as T1 and T2.
S3: if the data are in the punctuality state 1 and the punctuality state 2, the T1 is sent to the data processing module through the serial port according to the agreed frame protocol; if the state is in the punctuality state 3, the T2 is sent to the data processing module; if the device is in the internal timekeeping state, the last time of the device is required to be sent to the data processing module through the serial port.
On the basis of the above embodiments, when the big dipper/GPS intelligent two-satellite time service system is used as a clock source of the base station, an external base station mode is adopted, and this embodiment designs an interface between the intelligent two-satellite time service system and the base station.
The big dipper/GPS double star time service system is used as an interface for directly interconnecting a base station clock source and a base station, and the design steps are as follows:
s1: the 5G base station is provided with an external clock interface and comprises a 1PPS pulse signal and serial port time information. The Beidou/GPS intelligent double-satellite time service system supports external clock input and is automatically switched to an external clock input mode through base station database setting.
S2: the 5G base station is kept strictly clock synchronized by the GPS system, which receives the GPS signals and generates the time-frequency reference required by the system.
S3: the interface protocol is different due to the manufacturer of the 5G base station. The Beidou/GPS double-satellite time service system adopts a method for automatically judging the type of a base station to realize protocol switching, so that an interface program adapts to the requirements of different equipment.
S4: the 5G base station equipment accesses the external clock interface at regular time, determines the equipment type by judging the inquiry information, and responds according to a protocol corresponding to the equipment type, thereby realizing time information transmission.
The invention overcomes the defects of the traditional GPS-based time service synchronization network system and provides a 5G high-precision clock synchronization method based on various time service systems. By constructing a time synchronization networking model, a GPS/Beidou double-satellite time service system is used as a high-precision server of source equipment, and two application modes are provided, wherein one mode is directly interconnected with a base station as a clock source of the base station, the other mode is connected with a ground synchronization network as a clock source of the ground synchronization network, and clock information is provided for the base station through the ground synchronization network, so that the autonomous controllability of the 5G time synchronization networking is ensured, and the 5G time synchronization networking is stably and efficiently operated under the support of various time service systems.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A5G network clock synchronization method based on various time service systems is characterized in that the various time service systems are Beidou/GPS double-star time service systems, and a Beidou navigation system and a GPS are adopted as clock sources of a synchronization network, and the method comprises the following steps:
the time keeping module outputs a clock signal based on a clock source; respectively acquiring 1PPS signals of a GPS and a Beidou navigation system, and respectively comparing the acquired 1PPS signals with the 1PPS signals output by the time keeping module to determine a first clock error and a second clock error;
determining a timekeeping state of the system according to the collected 1PPS signals of the GPS and the Beidou navigation system, and determining a system clock error according to the timekeeping state, wherein the system clock error comprises a first clock error or a second clock error;
and inputting the determined clock error and the clock source into the data processing module for verification to determine the final clock signal of the time keeping module.
2. The 5G network clock synchronization method based on multiple time service systems according to claim 1, wherein the method for determining the first clock error and the second clock error comprises the following steps:
s1: the time keeping module receives 1PPS signals of the GPS and the Beidou navigation system respectively and generates 1PPS signals which are earlier than the 1PPS signals of the GPS and the Beidou navigation system by a preset time delta t respectively;
s2: the errors of two adjacent sets of periods T are stored consecutively:
clock error between 1PPS signal of GPS and 1PPS signal generated by time keeping module;
clock error between the 1PPS signal of the Beidou navigation system and the 1PPS signal generated by the time keeping module.
And respectively calculating the average value of the clock errors in the step (i) and the step (ii), and recording the average value as a first clock error T1 and a second clock error T2.
3. The 5G network clock synchronization method based on multiple time service systems according to claim 1, wherein the method for determining the time keeping state of the system according to the collected 1PPS signals of the GPS and the Beidou navigation system comprises the following steps:
after the system is powered on and operated, 1PPS signals generated by a GPS system and a Beidou navigation system are detected respectively;
if the 1PPS signals of the GPS and the Beidou navigation system pass the detection, entering a timekeeping state 1, and taking the GPS system signal as a timekeeping reference signal and the Beidou navigation system signal as a standby timekeeping signal; if only the 1PPS signal of the GPS passes the detection, entering a time-keeping state 2, and taking the GPS signal as a time-keeping reference signal;
if only the 1PPS signal of the Beidou navigation system passes the detection, the Beidou navigation system enters a timekeeping state 3, and the Beidou navigation system signal is used as a timekeeping reference signal;
and if the GPS signal and the Beidou navigation signal cannot be received at the same time, the system enters an internal timekeeping state.
4. The 5G network clock synchronization method based on multiple time service systems according to claim 3, further comprising switching of a time keeping state, wherein the specific switching method is as follows:
in the time keeping state 1, if the GPS and Beidou navigation system signals exist all the time, the GPS signal is used as a time keeping reference signal; if the GPS signal and the Beidou navigation signal cannot be received at the same time, the system enters an internal timekeeping state; if the Beidou navigation signal is only lost, entering a timekeeping state 2, and continuously adopting a GPS signal as a timekeeping reference signal; if only the GPS signal is lost, entering a timekeeping state 3, and taking a Beidou navigation system signal as a timekeeping reference signal at the moment;
after entering the time keeping state 2, a GPS signal is used as a time keeping reference signal, and if a Beidou navigation system signal is received, the time keeping state 1 is entered; if the GPS signal is lost, the internal timekeeping state is entered;
after entering a timekeeping state 3, a Beidou navigation system signal is adopted as a timekeeping reference signal; if a GPS signal is received, entering a timekeeping state 1; if the Beidou navigation system signal is lost, the Beidou navigation system enters an internal timekeeping state;
the GPS and Beidou navigation system is in an internal timekeeping state, and if 1PPS signals of the GPS and the Beidou navigation system are received at the same time, the GPS and Beidou navigation system enter the timekeeping state 1; if only receiving the 1PPS signal of the GPS, entering a timekeeping state 2; if only the 1PPS signal of the Beidou navigation system is received, the state of keeping watch is entered into 3.
5. The 5G network clock synchronization method based on multiple time service systems according to claim 3, wherein the method for determining whether the first clock error or the second clock error is adopted as the system clock error according to the time keeping state is as follows:
if the clock is in the punctuality state 1 and the punctuality state 2, the first clock error T1 is used as the system clock error through the serial port according to the agreed frame protocol; in the time-keeping state 3, the second clock error T2 is regarded as the system clock error.
6. The method for 5G network clock synchronization based on multiple time service systems according to claim 5, wherein if the system is in an internal timekeeping state, the last determined clock error is taken as the system clock error.
7. The 5G network clock synchronization method based on multiple time service systems according to claim 1, wherein the Beidou/GPS double-satellite time service system is provided with an interface directly interconnected with a base station, and is used for realizing that the Beidou/GPS double-satellite time service system is used as a base station clock source or an external clock for just inputting.
8. The 5G network clock synchronization method based on multiple time service systems as claimed in claim 7, wherein the interface automatically determines the type of the base station to implement protocol switching.
9. The 5G network clock synchronization method based on multiple time service systems as claimed in claim 7, wherein said interface is used for transmitting 1PPS pulse signal and serial port time information.
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| CN114157379A (en) * | 2021-12-02 | 2022-03-08 | 江西边际科技有限公司 | Self-correcting high-precision time synchronization device for independent networking of multiple modules |
| CN114488766A (en) * | 2022-01-25 | 2022-05-13 | 浙江赛思电子科技有限公司 | Clock time service method, device and medium |
| CN117930622A (en) * | 2024-03-25 | 2024-04-26 | 山东师范大学 | Wireless electronic control timing system |
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| CN114019563A (en) * | 2022-01-05 | 2022-02-08 | 南京邮电大学 | Seismic exploration synchronous acquisition method based on GPS and 5G dual-channel high-precision time service |
| CN114019563B (en) * | 2022-01-05 | 2022-04-01 | 南京邮电大学 | Seismic exploration synchronous acquisition method based on GPS and 5G dual-channel high-precision time service |
| CN114488766A (en) * | 2022-01-25 | 2022-05-13 | 浙江赛思电子科技有限公司 | Clock time service method, device and medium |
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