CN113939008A - Base station time synchronization method and system - Google Patents
Base station time synchronization method and system Download PDFInfo
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- CN113939008A CN113939008A CN202111186058.6A CN202111186058A CN113939008A CN 113939008 A CN113939008 A CN 113939008A CN 202111186058 A CN202111186058 A CN 202111186058A CN 113939008 A CN113939008 A CN 113939008A
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Abstract
The application provides a base station time synchronization method and a system, wherein the method comprises the following steps: the method comprises the steps that a PRTC device sends a PRTC time source to a bearing network element and a second base station, the first base station sends a first time source to the bearing network element according to acquired GNSS time, the bearing network element determines first priorities of the first time source and the PRTC time source and sends a second time source with the highest first priority to the second base station based on a BMC (baseboard management controller) source selection algorithm, and the second base station selects the time source with the highest second priority from the second time source, the PRTC time source and a local crystal oscillator time source to serve as base station time of the second base station. By the method, the time synchronization of the base station is realized.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a method and a system for synchronizing base station time.
Background
Currently, with the continuous development of the information era, the wireless communication technology becomes one of the key directions of the current application development due to the advantages of low cost and convenience, and the user terminals can transmit information through the base station.
However, as the services of users gradually expand, some services requiring high time accuracy with low latency, such as car networking, telemedicine, etc., gradually develop. In practical application, the problems that the cost of a feeder line is too high, a satellite signal is easy to interfere, the self time keeping capability of a base station is limited after the satellite signal is lost and the like often occur. The above problems may cause the synchronization time of the base station not to meet the requirement of part of user services, thereby reducing the user experience.
Therefore, how to improve the time accuracy of base station synchronization is the focus of research on optimizing user experience at present.
Disclosure of Invention
The application provides a base station time synchronization method and a base station time synchronization system, which are used for improving the time precision of a base station.
In a first aspect, the present application provides a base station time synchronization method, which is applied to a base station time synchronization system, where the system includes a PRTC device, a first base station, a bearer network element, and a second base station;
the PRTC equipment sends a PRTC time source to a bearing network element and a second base station;
the first base station sends a first time source to a bearing network element according to the acquired GNSS time; wherein the first base station is configured with a GNSS; the first base station and the bearing network element establish serial time interface protocol communication through a network cable, and the length of the network cable between the first base station and the bearing network element is not higher than a preset threshold value;
the bearer network element determines a first priority of the first time source and the PRTC time source based on a BMC (baseboard management controller) source selection algorithm, and sends a second time source with the highest first priority to the second base station;
and the second base station determines the time source with the highest second priority in the second time source, the PRTC time source and the local crystal oscillator time source as the base station time of the second base station according to a preset second priority.
In one possible implementation manner, the method further includes:
the first base station sends a first time source to a bearing network element according to the acquired GNSS time;
the first base station obtains base station time of the first base station according to the obtained GNSS time;
the first base station detects the time precision of the base station time of the first base station through a high-precision time test instrument; if the time precision exceeds a preset first range;
and sending the current base station time of the first base station as the first time source to the bearing network element.
In one possible implementation manner, the method further includes:
the bearing network element sends a second time source with the highest first priority to the second base station;
the bearing network element obtains the time of the bearing network element according to the first time source;
the bearing network element detects the time precision of the time of the bearing network element through a high-precision time test instrument; if the time precision exceeds a preset second range, adjusting the communication configuration of a serial time interface protocol until the time precision of the time of the current bearing network element is in the second range;
and sending the current time of the network element of the bearer network to the second base station as the second time source.
In one possible implementation manner, the method further includes:
the bearer network element comprises a convergence network element; the sending, by the bearer network element, the second time source with the highest first priority to the second base station includes: the convergence network element sends a second time source with the highest first priority to the second base station through the access network element;
alternatively, the first and second electrodes may be,
the bearer network element comprises an access network element; the sending, by the bearer network element, the second time source with the highest first priority to the second base station includes: and the access network element sends a second time source with the highest first priority to the second base station.
In one possible implementation manner, the method further includes:
the number of the first base stations is multiple, different first base stations correspond to different bearing network elements, and different bearing network elements correspond to different second base stations; the first base station sends a first time source to a network element of a bearer network according to the acquired GNSS time, and the method comprises the following steps:
and the first base station sends a first time source to a corresponding bearing network element according to the acquired GNSS time.
In one possible implementation manner, the method further includes:
and if any first base station fails, updating and corresponding the bearing network element corresponding to the first base station to other first base stations.
In one possible implementation manner, the method further includes:
if the first base station has a complete machine fault, the network element of the bearer network sends a PRTC time source with the highest priority to the second base station based on a BMC (baseboard management controller) source selection algorithm; the second base station determines a time source with the highest priority in the PRTC time source and the local crystal oscillator time source as the base station time of the second base station according to a preset second priority;
if the first base station has GNSS fault, the serial time interface protocol communication between the first base station and the network elements of the bearing network is cut off; the network element of the bearer network sends a PRTC time source with the highest priority to the second base station based on a BMC (baseboard management controller) source selection algorithm; and the second base station determines a time source with the highest priority in the PRTC time source and the local crystal oscillator time source as the base station time of the second base station according to a preset second priority.
In a second aspect, the present application provides a base station time synchronization system, including: the system comprises PRTC equipment, a first base station, a bearing network element and a second base station; wherein the content of the first and second substances,
the PRTC equipment is used for sending a PRTC time source to a bearing network element and a second base station;
the first base station is used for sending a first time source to a bearing network element according to the acquired GNSS time; wherein the first base station is configured with a GNSS; the first base station and the bearing network element establish serial time interface protocol communication through a network cable, and the length of the network cable between the first base station and the bearing network element is not higher than a preset threshold value;
the bearer network element is configured to determine a first priority of the first time source and the PRTC time source based on a BMC source selection algorithm, and send a second time source with a highest first priority to the second base station;
and the second base station is configured to determine, according to a predetermined second priority, a time source with a highest second priority among the second time source, the PRTC time source, and the local crystal time source as a base station time of the second base station.
In one possible implementation manner, the method further includes:
the first base station is specifically configured to obtain a base station time of the first base station according to the obtained GNSS time;
the first base station is specifically further configured to detect, through a high-precision time test instrument, time precision of base station time of the first base station; if the time precision exceeds a preset first range, adjusting the length of the feeder line until the time precision of the base station time of the current first base station is within the first range;
the first base station is further specifically configured to send the current base station time of the first base station to the bearer network element as the first time source.
In one possible implementation manner, the method further includes:
the bearer network element is specifically configured to obtain a time of the bearer network element according to the first time source;
the bearing network element is specifically used for detecting the time precision of the time of the bearing network element through a high-precision time test instrument; if the time precision exceeds a preset second range, adjusting the communication configuration of a serial time interface protocol until the time precision of the time of the current bearing network element is in the second range;
the bearer network element is further specifically configured to send the current time of the bearer network element to the second base station as the second time source.
In one possible implementation manner, the method further includes:
the bearer network element comprises a convergence network element; the aggregation network element is specifically configured to send a second time source with a highest first priority to the second base station through an access network element;
alternatively, the first and second electrodes may be,
the bearer network element comprises an access network element; the access network element is specifically configured to send a second time source with a highest first priority to the second base station.
In one possible implementation manner, the method further includes:
the number of the first base stations is multiple, different first base stations correspond to different bearing network elements, and different bearing network elements correspond to different second base stations;
the first base station is specifically configured to send a first time source to a corresponding bearer network element according to the obtained GNSS time.
In one possible implementation manner, the method further includes:
and the first base station is further configured to update the bearer network element corresponding to the first base station to correspond to another first base station if any first base station fails.
In one possible implementation manner, the method further includes:
the bearer network element is further configured to send a PRTC time source with the highest priority to the second base station based on a BMC source selection algorithm if the first base station has a complete machine fault; the second base station is further configured to determine, according to a predetermined second priority, a time source with a highest priority among the PRTC time source and the local crystal oscillator time source as the base station time of the second base station;
the first base station is also used for disconnecting serial time interface protocol communication with a bearing network element if the first base station has GNSS fault; the bearer network element is further configured to send a PRTC time source with the highest priority to the second base station based on a BMC source selection algorithm; and the second base station is further configured to determine, according to a predetermined second priority, a time source with a highest priority among the PRTC time source and the local crystal oscillator time source as the base station time of the second base station.
According to the base station time synchronization method and system, the PRTC equipment sends a PRTC time source to a bearing network element and a second base station, the first base station sends a first time source to the bearing network element according to the obtained GNSS time, the bearing network element determines the first priority of the first time source and the PRTC time source and sends a second time source with the highest first priority to the second base station based on a BMC (baseboard management controller) source selection algorithm, and the second base station selects the time source with the highest second priority from the second time source, the PRTC time source and a local crystal oscillator time source to serve as the base station time of the second base station. Through the scheme, the time source with higher priority can be selectively synchronized according to the BMC algorithm, so that the time precision is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic view of an application scenario of a base station time synchronization method provided in the present application;
fig. 2 is a schematic flowchart of a base station time synchronization method according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a base station time synchronization method according to a second embodiment of the present application;
fig. 4 is a diagram illustrating a structure of a base station time synchronization method according to a third embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terms involved are explained first:
PRTC equipment: apparatus for providing one or more types of time and frequency output functions using a time input signal derived from a uniform time reference.
BMC algorithm: the method is one of the most main core technologies of the precise clock synchronization protocol, and a system performing clock synchronization according to the precise clock synchronization protocol selects a main clock in the system by running a BMC algorithm.
Fig. 1 is a schematic view of an application scenario of a base station time synchronization method provided in an embodiment of the present application, and as shown in fig. 1, the scenario includes: the system comprises PRTC equipment 1, a first base station 2, a bearer network convergence network element 3, a bearer network access network element 4, a second base station 5 and a sinking small source 6.
Exemplified in connection with the illustrated scenario: the scenario 1 shows an application scenario of the existing time synchronization method, where a PRTC device 1 sends a PRTC time source to a carrier network convergence network element 3, a sinking small source 6 sends a time source to the carrier network convergence network element 3, the carrier network convergence network element 3 sends the received time source to a carrier network access network element 4, and a second base station 5 receives the time source sent by the carrier network access network element 4, thereby implementing base station time synchronization. Scene 2 shows an application scenario of another time synchronization method provided in the embodiment of the present application, in which a first base station 2 is used to replace a sinking small-scale source 6 to send a time source to a carrier network convergence network element 3, and no special sinking small-scale source device needs to be configured, so that time accuracy is improved, construction and operation and maintenance costs are reduced, and base station time synchronization is achieved.
The following describes an example of the embodiments of the present application with reference to the following embodiments.
Example one
Fig. 2 is a schematic flowchart of a base station time synchronization method according to an embodiment of the present disclosure, where the method of the present embodiment is applicable to a base station time synchronization system, where the base station time synchronization system includes a PRTC device, a first base station, a local message server, and a plurality of software modules; the method comprises the following steps:
s101, the PRTC equipment sends a PRTC time source to a bearing network element and a second base station;
s102, the first base station sends a first time source to a bearing network element according to the acquired GNSS time; wherein the first base station is configured with a GNSS; the first base station and the bearing network element establish serial time interface protocol communication through a network cable, and the length of the network cable between the first base station and the bearing network element is not higher than a preset threshold value;
s103, the network element of the bearer network determines the first priority of the first time source and the PRTC time source based on a BMC source selection algorithm, and sends a second time source with the highest first priority to the second base station;
s104, the second base station determines the time source with the highest second priority in the second time source, the PRTC time source and the local crystal oscillator time source as the base station time of the second base station according to a preset second priority.
Optionally, the number of the PRTC devices is multiple, and different PRTC devices correspond to different bearer network elements; the PRTC devices respectively send PRTC time sources to corresponding bearer network elements, and in one example, the PRTC devices respectively select the bearer network elements corresponding thereto according to a "proximity principle" to reduce the length of a network cable and improve time accuracy.
In order to ensure the reliability of the time synchronization of the base station, in an example, if any PRTC device fails, the bearer network element corresponding to the PRTC device is updated to correspond to other PRTC devices. Specifically, if any PRTC device fails, the bearer network element corresponding to the PRTC device is immediately mapped to another PRTC device, and another PRTC device provides a PRTC time source, so that even if any PRTC device fails, another PRTC device can immediately provide a first time source, thereby improving the reliability of time synchronization of the base station.
Optionally, the preset threshold of the length of the network cable between the first base station and the network element of the bearer network is 100 meters. Specifically, in the embodiment, a first base station configured with a GNSS is selected as a sinking small source; the first base station and the bearing network element establish serial time interface protocol communication through a network cable, and the length of the network cable between the first base station and the bearing network element is not higher than a preset threshold value. Correspondingly, a first base station serving as a sinking small source provides a first time source according to a PRTC time source, a bearer network element combines the PRTC time source, selects a time source with higher priority from the PRTC time source and the first time source based on a BMC algorithm as a second time source, and finally selects a time source with highest priority from the second time source, the PRTC time source and local crystal oscillator time as base station time by the second base station, so that the synchronization of the base station time is realized, and a time source with higher precision is selected based on the priority, so that the time precision can be effectively improved, and the first base station serves as the sinking small source, so that extra special equipment is not required to serve as the sinking small source, and the cost is further reduced.
In one example, S102 may specifically include: the first base station obtains base station time of the first base station according to the obtained GNSS time; the first base station detects the time precision of the base station time of the first base station through a high-precision time test instrument; if the time precision exceeds a preset first range, adjusting the length of the feeder line until the time precision of the base station time of the current first base station is within the first range; and sending the current base station time of the first base station as the first time source to the bearing network element.
Optionally, the first range is-20 nanoseconds (ns) -20ns, and the feeder length is adjusted until the time accuracy of the base station of the first base station is within the first range, and then the time accuracy of the first base station is considered to meet the requirement, and the feeder length is stopped being adjusted.
According to the method in the example, the first base station serves as a sinking small source to provide a first time source, the time precision of the first base station is optimized by using the high-precision time testing instrument, and the time precision is guaranteed to be within a preset range, so that the time precision of the first time source is improved, and the time precision of base station time synchronization is further improved.
In one example, S103 may specifically include: the bearing network element obtains the time of the bearing network element according to the first time source; the bearing network element detects the time precision of the time of the bearing network element through a high-precision time test instrument; if the time precision exceeds a preset second range, adjusting the communication configuration of a serial time interface protocol until the time precision of the time of the current bearing network element is in the second range; and sending the current time of the network element of the bearer network to the second base station as the second time source.
Optionally, the second range is-20 ns to 20ns, and if the communication configuration of the serial time interface protocol is adjusted until the time precision of the bearer network element is within the second range, it is determined that the time precision of the bearer network element meets the requirement, and the adjustment of the communication configuration of the serial time interface protocol is stopped.
By the method in the example, the time precision of the network element of the bearer network is optimized by using the high-precision time testing instrument, and the time precision is ensured to be within a preset range, so that the time precision of the second time source is improved, and the time precision of the time synchronization of the base station is further improved.
The bearer network element may be a network element device with a communication function, so as to send the second time source to the second base station. In one example, the bearer network element comprises a convergence network element; the sending, by the bearer network element, the second time source with the highest first priority to the second base station includes: and the convergence network element sends a second time source with the highest first priority to the second base station through the access network element. In another example, the bearer network element comprises an access network element; the sending, by the bearer network element, the second time source with the highest first priority to the second base station includes: and the access network element sends a second time source with the highest first priority to the second base station.
Optionally, the number of the first base stations is multiple, different first base stations correspond to different bearer network elements, and different bearer network elements correspond to different second base stations; the first base station sends a first time source to a network element of a bearer network according to the acquired GNSS time, and the method comprises the following steps: and the first base station sends a first time source to a corresponding bearing network element according to the acquired GNSS time. In one example, the first base station selects bearer network elements corresponding to the first base station according to a "proximity principle" to reduce the length of network lines and improve the time accuracy.
In order to ensure the reliability of the time synchronization of the base stations, in an example, if any first base station fails, the bearer network element corresponding to the first base station is updated to correspond to other first base stations. Specifically, if a first base station serving as a sinking small-sized source fails, a bearer network element corresponding to the first base station is timely corresponded to other first base stations, and other first base stations provide a first time source, so that even if the first base station fails, other first base stations can timely provide the first time source, and the reliability of base station time synchronization is improved.
In the base station time synchronization method provided in this embodiment, a PRTC device sends a PRTC time source to a bearer network element and a second base station, the first base station sends a first time source to the bearer network element according to an acquired GNSS time, the bearer network element determines first priorities of the first time source and the PRTC time source and sends a second time source with a highest first priority to the second base station based on a BMC source selection algorithm, and the second base station selects the time source with the highest second priority from the second time source, the PRTC time source, and a local crystal oscillator time source as a base station time of the second base station. Through the scheme, the first base station serving as a sinking small source provides a first time source, the bearer network element combines with the PRTC time source, and selects a time source with higher synchronous priority based on a BMC algorithm, and finally the second base station can select the time source with the highest priority from a plurality of time sources as the base station time, so that the time precision is improved.
Example two
Fig. 3 is a schematic flow chart of a base station time synchronization method provided in the second embodiment of the present application, and on the basis of the first embodiment, the present embodiment illustrates a first base station failure processing flow. As shown in fig. 3, on the basis of the first embodiment, the method further includes:
s201, if the first base station has a complete machine fault, the bearer network element sends a PRTC time source with the highest priority to the second base station based on a BMC (baseboard management controller) source selection algorithm; the second base station determines a time source with the highest priority in the PRTC time source and the local crystal oscillator time source as the base station time of the second base station according to a preset second priority;
s202, if the GNSS fault occurs in the first base station, the serial time interface protocol communication between the first base station and the network element of the carrying network is disconnected; the network element of the bearer network sends a PRTC time source with the highest priority to the second base station based on a BMC (baseboard management controller) source selection algorithm; and the second base station determines a time source with the highest priority in the PRTC time source and the local crystal oscillator time source as the base station time of the second base station according to a preset second priority.
Optionally, when the first base station fails, the base station time synchronization system determines whether the first base station has a complete machine failure or the first base station has a GNSS failure.
In an example, if the first base station has a complete machine failure, the first base station cannot send a first time source, the first time source does not participate in the BMC source selection algorithm, and the bearer network element sends a PRTC time source with the highest priority to the second base station based on the BMC source selection algorithm.
In one example, if the first base station has a GNSS fault, the first base station is triggered to send a clock source alarm according to a preset program, the base station time synchronization system closes a serial time interface protocol between the first base station and the bearer network element, the first time source does not participate in a BMC source selection algorithm, and the bearer network element sends a PRTC time source with the highest priority to the second base station based on the BMC source selection algorithm.
In the base station time synchronization method provided in this embodiment, if the first base station has a complete machine failure, the bearer network element sends the PRTC time source with the highest priority to the second base station based on the BMC source selection algorithm. If the first base station has GNSS fault, the serial time interface protocol communication between the first base station and the network elements of the bearing network is cut off; and the network element of the bearer network sends the PRTC time source with the highest priority to the second base station based on the BMC source selection algorithm. Through the scheme, the base station time synchronization system can enable the time source of the fault not to participate in the BMC source selection algorithm according to different fault types, and selectively synchronizes the time source with higher priority from the alternative time source according to the preset BMC algorithm, so that the time precision is improved.
EXAMPLE III
Fig. 4 is a schematic structural diagram of a base station time synchronization system provided in a third embodiment of the present application, and as shown in fig. 4, the system includes: PRTC equipment 61, a first base station 62, a bearer network element 63, and a second base station 64.
The PRTC device 61 is configured to send a PRTC time source to the bearer network element and the second base station;
the first base station 62 is configured to send a first time source to a network element of the bearer network according to the obtained GNSS time; wherein the first base station 62 is configured with a GNSS; the first base station 62 and the bearer network element 63 establish serial time interface protocol communication through a network cable, and the length of the network cable between the first base station 62 and the bearer network element 63 is not higher than a preset threshold;
the bearer network element 63 is configured to determine a first priority of the first time source and the PRTC time source based on a BMC source selection algorithm, and send a second time source with a highest first priority to the second base station 64;
and the second base station 64 is configured to determine, according to a predetermined second priority, a time source with a highest second priority among the second time source, the PRTC time source, and the local crystal time source as a base station time of the second base station 64.
Optionally, the number of the PRTC devices 61 is multiple, and different PRTC devices 61 correspond to different bearer network elements; the PRTC device 61 sends PRTC time sources to corresponding bearer network elements, and in an example, the PRTC device selects the bearer network elements corresponding to the PRTC time sources according to a "proximity principle" to reduce the length of the network cable and improve the time accuracy.
In order to ensure the reliability of the time synchronization of the base station, in an example, if any PRTC device 61 fails, the bearer network element corresponding to the PRTC device 61 is updated to correspond to other PRTC devices 61. Specifically, if any PRTC device 61 fails, the bearer network element corresponding to the PRTC device 61 is immediately associated with another PRTC device 61, and another PRTC device 61 provides a PRTC time source, so that even if any PRTC device 61 fails, another PRTC device 61 can provide a first time source in time, thereby improving the reliability of time synchronization of the base station.
Optionally, the preset threshold of the length of the network cable between the first base station 62 and the bearer network element 63 is 100 meters. Specifically, in this embodiment, the first base station 62 configured with GNSS is selected as the sinking small source; the first base station 62 and the bearer network element 63 establish serial time interface protocol communication through a network cable, and the length of the network cable between the first base station 62 and the bearer network element 63 is not higher than a preset threshold. Correspondingly, the first base station 62 serving as a sinking small source provides a first time source according to a PRTC time source, the bearer network element 63 combines with the PRTC time source, selects a time source with a higher priority from the PRTC time source and the first time source based on a BMC algorithm as a second time source, and finally the second base station 64 selects a time source with a highest priority from the second time source, the PRTC time source and the local crystal oscillation time as a base station time to realize synchronization of the base station times.
In one example. The first base station 62 obtains the base station time of the first base station 62 according to the obtained GNSS time; the first base station 62 detects the time precision of the base station time of the first base station 62 through a high-precision time test instrument; if the time accuracy is beyond a preset first range, adjusting the length of the feeder line until the time accuracy of the base station time of the current first base station 62 is within the first range; and sending the current base station time of the first base station 62 as the first time source to the bearer network element 63.
Optionally, the first range is-20 nanoseconds (ns) -20ns, and the feeder length is adjusted until the time accuracy of the base station of the first base station is within the first range, and then the time accuracy of the first base station is considered to meet the requirement, and the feeder length is stopped being adjusted.
Through the system in this example, the first base station 62 serves as a sinking small source to provide a first time source, and the time precision of the first base station 62 is optimized by using a high-precision time testing instrument, so that the time precision is ensured to be within a predetermined range, thereby improving the time precision of the first time source and further improving the time precision of base station time synchronization.
In one example, the bearer network element 63 obtains the time of the bearer network element 63 according to the first time source; the bearing network element 63 detects the time precision of the time of the bearing network element 63 through a high-precision time test instrument; if the time precision exceeds a preset second range, adjusting the communication configuration of the serial time interface protocol until the time precision of the time of the current bearing network element 63 is within the second range; and sending the current time of the network element of the bearer network to the second base station 64 as the second time source.
Optionally, the second range is-20 ns to 20ns, and if the time precision of the bearer network element 63 is adjusted until the time precision of the bearer network element 63 is within the second range, it is determined that the time precision of the bearer network element 63 meets the requirement, and the adjustment of the communication configuration of the serial time interface protocol is stopped.
By the system in the example, the time precision of the bearing network element 63 is optimized by using the high-precision time testing instrument, and the time precision is ensured to be within a preset range, so that the time precision of the second time source is improved, and the time precision of the base station time synchronization is further improved.
In one example, the bearer network element 63 comprises a convergence network element; the aggregation network element is specifically configured to send a second time source with the highest first priority to the second base station 64 through an access network element; in another example, the bearer network element 63 comprises an access network element; the access network element is specifically configured to send the second time source with the highest first priority to the second base station 64.
Optionally, the number of the first base stations 62 is multiple, different first base stations 62 correspond to different bearer network elements 63, and different bearer network elements 63 correspond to different second base stations 64; the first base station 62 sends the first time source to the bearer network element 63 according to the obtained GNSS time. In one example, the first base station 62 selects the bearer network element 63 corresponding to it according to a "proximity principle" to reduce the length of the network cable and improve the time accuracy.
In order to ensure the reliability of the time synchronization of the base stations, in an example, if any first base station 62 fails, the bearer network element 63 corresponding to the first base station 62 is updated to correspond to other first base stations. Specifically, if the first base station 62 as the sinking small-sized source fails, the bearer network element 63 corresponding to the first base station 62 is immediately associated with another first base station 62, and the other first base station 62 provides the first time source, so that even if the first base station 62 fails, the other first base station can immediately provide the first time source, and thus the reliability of the base station time synchronization is improved.
In the base station time synchronization system provided in this embodiment, the PRTC device sends a PRTC time source to the bearer network element and the second base station, the first base station sends a first time source to the bearer network element according to the acquired GNSS time, the bearer network element determines the first priorities of the first time source and the PRTC time source and sends a second time source with the highest first priority to the second base station based on a BMC source selection algorithm, and the second base station selects the time source with the highest second priority from the second time source, the PRTC time source, and the local crystal oscillator time source as the base station time of the second base station. Through the scheme, the first base station serving as a sinking small source provides a first time source, the bearer network element combines with the PRTC time source, and selects a time source with higher synchronous priority based on a BMC algorithm, and finally the second base station can select the time source with the highest priority from a plurality of time sources as the base station time, so that the time precision is improved.
Example four
The fourth embodiment of the present application provides a base station time synchronization system, which is based on the third embodiment:
the bearer network element 63 is further configured to, if the first base station 62 has a complete machine failure, send the highest priority PRTC time source to the second base station 64 by the bearer network element 63 based on a BMC source selection algorithm; the second base station 64 is further configured to determine, according to a predetermined second priority, a time source with a highest priority among the PRTC time source and the local crystal time source as the base station time of the second base station 64.
The first base station 62 is further configured to disconnect serial time interface protocol communication with the bearer network element 63 if the first base station 62 has a GNSS fault; the bearer network element 63 is further configured to send a PRTC time source with the highest priority to the second base station 64 based on a BMC source selection algorithm; the second base station 64 is further configured to determine, according to a predetermined second priority, a time source with a highest priority among the PRTC time source and the local crystal time source as the base station time of the second base station 64.
Optionally, when the first base station 62 fails, the base station time synchronization system first determines whether the first base station 62 has a complete machine failure or the first base station 62 has a GNSS failure, and then executes the corresponding failure processing.
In an example, the first base station 62 is further configured to send out a clock source alarm according to a preset procedure if the first base station 62 has a GNSS failure. So as to prompt fault maintenance in time.
In the base station time synchronization system provided in this embodiment, if the first base station has a complete machine failure, the bearer network element sends the PRTC time source with the highest priority to the second base station based on the BMC source selection algorithm. If the first base station has GNSS fault, the serial time interface protocol communication between the first base station and the network elements of the bearing network is cut off; and the network element of the bearer network sends the PRTC time source with the highest priority to the second base station based on the BMC source selection algorithm. Through the scheme, the base station time synchronization system can enable the time source of the fault not to participate in the BMC source selection algorithm according to different fault types, and selectively synchronizes the time source with higher priority from the alternative time source according to the preset BMC algorithm, so that the time precision is improved.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (14)
1. A base station time synchronization method is characterized in that the method is applied to a base station time synchronization system, and the system comprises a reference main time PRTC device, a first base station, a bearing network element and a second base station; the method comprises the following steps:
the PRTC equipment sends a PRTC time source to a bearing network element and a second base station;
the first base station sends a first time source to a bearing network element according to the acquired GNSS time of the global navigation satellite system; wherein the first base station is configured with a GNSS; the first base station and the bearing network element establish serial time interface protocol communication through a network cable, and the length of the network cable between the first base station and the bearing network element is not higher than a preset threshold value;
the bearer network element determines a first priority of the first time source and the PRTC time source based on an optimal master clock BMC source selection algorithm, and sends a second time source with the highest first priority to the second base station;
and the second base station determines the time source with the highest second priority in the second time source, the PRTC time source and the local crystal oscillator time source as the base station time of the second base station according to a preset second priority.
2. The method of claim 1, wherein the sending, by the first base station, the first time source to the bearer network element according to the obtained GNSS time comprises:
the first base station obtains base station time of the first base station according to the obtained GNSS time;
the first base station detects the time precision of the base station time of the first base station through a high-precision time test instrument; if the time precision exceeds a preset first range, adjusting the length of the feeder line until the time precision of the base station time of the current first base station is within the first range;
and sending the current base station time of the first base station as the first time source to the bearing network element.
3. The method of claim 1, wherein the sending, by the bearer network element, the first highest-priority second time source to the second base station comprises:
the bearing network element obtains the time of the bearing network element according to the first time source;
the bearing network element detects the time precision of the time of the bearing network element through a high-precision time test instrument; if the time precision exceeds a preset second range, adjusting the communication configuration of a serial time interface protocol until the time precision of the time of the current bearing network element is in the second range;
and sending the current time of the network element of the bearer network to the second base station as the second time source.
4. The method of claim 1,
the bearer network element comprises a convergence network element; the sending, by the bearer network element, the second time source with the highest first priority to the second base station includes: the convergence network element sends a second time source with the highest first priority to the second base station through the access network element;
alternatively, the first and second electrodes may be,
the bearer network element comprises an access network element; the sending, by the bearer network element, the second time source with the highest first priority to the second base station includes: and the access network element sends a second time source with the highest first priority to the second base station.
5. The method of claim 1, wherein the number of the first base stations is multiple, different first base stations correspond to different bearer network elements, and different bearer network elements correspond to different second base stations; the first base station sends a first time source to a network element of a bearer network according to the acquired GNSS time, and the method comprises the following steps:
and the first base station sends a first time source to a corresponding bearing network element according to the acquired GNSS time.
6. The method of claim 5, further comprising:
and if any first base station fails, updating and corresponding the bearing network element corresponding to the first base station to other first base stations.
7. The method according to any one of claims 1-6, further comprising:
if the first base station has a complete machine fault, the network element of the bearer network sends a PRTC time source with the highest priority to the second base station based on a BMC (baseboard management controller) source selection algorithm; the second base station determines a time source with the highest priority in the PRTC time source and the local crystal oscillator time source as the base station time of the second base station according to a preset second priority;
if the first base station has GNSS fault, the serial time interface protocol communication between the first base station and the network elements of the bearing network is cut off; the network element of the bearer network sends a PRTC time source with the highest priority to the second base station based on a BMC (baseboard management controller) source selection algorithm; and the second base station determines a time source with the highest priority in the PRTC time source and the local crystal oscillator time source as the base station time of the second base station according to a preset second priority.
8. A base station time synchronization system, comprising: the system comprises PRTC equipment, a first base station, a bearing network element and a second base station; wherein the content of the first and second substances,
the PRTC equipment is used for sending a PRTC time source to a bearing network element and a second base station;
the first base station is used for sending a first time source to a bearing network element according to the acquired GNSS time; wherein the first base station is configured with a GNSS; the first base station and the bearing network element establish serial time interface protocol communication through a network cable, and the length of the network cable between the first base station and the bearing network element is not higher than a preset threshold value;
the bearer network element is configured to determine a first priority of the first time source and the PRTC time source based on a BMC source selection algorithm, and send a second time source with a highest first priority to the second base station;
and the second base station is configured to determine, according to a predetermined second priority, a time source with a highest second priority among the second time source, the PRTC time source, and the local crystal time source as a base station time of the second base station.
9. The base station time synchronization system of claim 8,
the first base station is specifically configured to obtain a base station time of the first base station according to the obtained GNSS time;
the first base station is specifically further configured to detect, through a high-precision time test instrument, time precision of base station time of the first base station; if the time precision exceeds a preset first range, adjusting the length of the feeder line until the time precision of the base station time of the current first base station is within the first range;
the first base station is further specifically configured to send the current base station time of the first base station to the bearer network element as the first time source.
10. The base station time synchronization system of claim 8,
the bearer network element is specifically configured to obtain a time of the bearer network element according to the first time source;
the bearing network element is specifically used for detecting the time precision of the time of the bearing network element through a high-precision time test instrument; if the time precision exceeds a preset second range, adjusting the communication configuration of a serial time interface protocol until the time precision of the time of the current bearing network element is in the second range;
the bearer network element is further specifically configured to send the current time of the bearer network element to the second base station as the second time source.
11. The base station time synchronization system of claim 8,
the bearer network element comprises a convergence network element; the aggregation network element is specifically configured to send a second time source with a highest first priority to the second base station through an access network element;
alternatively, the first and second electrodes may be,
the bearer network element comprises an access network element; the access network element is specifically configured to send a second time source with a highest first priority to the second base station.
12. The base station time synchronization system of claim 8, wherein the number of the first base stations is plural, different first base stations correspond to different bearer network elements, and different bearer network elements correspond to different second base stations;
the first base station is specifically configured to send a first time source to a corresponding bearer network element according to the obtained GNSS time.
13. The base station time synchronization system of claim 8,
and the first base station is further configured to update the bearer network element corresponding to the first base station to correspond to another first base station if any first base station fails.
14. Base station time synchronization system according to any of the claims 7-13,
the bearer network element is further configured to send a PRTC time source with the highest priority to the second base station based on a BMC source selection algorithm if the first base station has a complete machine fault; the second base station is further configured to determine, according to a predetermined second priority, a time source with a highest priority among the PRTC time source and the local crystal oscillator time source as the base station time of the second base station;
the first base station is also used for disconnecting serial time interface protocol communication with a bearing network element if the first base station has GNSS fault; the bearer network element is further configured to send a PRTC time source with the highest priority to the second base station based on a BMC source selection algorithm; and the second base station is further configured to determine, according to a predetermined second priority, a time source with a highest priority among the PRTC time source and the local crystal oscillator time source as the base station time of the second base station.
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