TWI611675B - Online monitoring system and method for precise time agreement signal distribution - Google Patents

Description

Online monitoring system and method for precise time agreement signal distribution

The present invention relates to an on-line monitoring system and method for precise time-scheduled signal distribution, and more particularly to a time synchronization system and method for applying a time-scheduled clock distribution time source to a packet-switched network.

With the rapid development of mobile communication technology, the radio access network (Poly Access Network) transmission technology has higher requirements for time synchronization, especially in the 4G network architecture, the base of the LTE-TDD (Time Division Duplexing) architecture. Evolved Node B or part of LTE-A (LTE-Advanced) technology requires a highly accurate time synchronization mechanism as a benchmark for wireless high-speed transmission.

Therefore, in the Mobile Backhaul network, the high-precision time source is transmitted in a precise time agreement to meet the needs of the 4G base station, and it becomes the best solution for the wireless access network to achieve time synchronization, and to ensure the action. The time synchronization signal transmitted by the backhaul network with precise time agreement and the synchronization accuracy of Coordinated Universal Time, it is necessary to develop a system and method that can conveniently monitor the precise time agreement to achieve time synchronization accuracy.

In addition, due to the innate design of bandwidth sharing, the packet switching network has a certain degree of difficulty in synchronizing time. In the prior art, there is a method of transmitting a time source through a Network Time Protocol, but it still cannot fully meet the time synchronization accuracy requirement of the 4G base station; and in order to solve this accuracy problem, the action backhaul network The user changes the application of the precise time protocol to transmit the time source, but the measurement of the time synchronization accuracy still depends on the time synchronization measuring instrument, which inevitably increases the complexity of the monitoring system, and when the synchronization is accurate When the degree is insufficient, the manager must go to the machine room where each precise time-sharing clock is located for measurement.

In addition, there is a method of monitoring the time stamp of the master clock by collecting a precise time-scheduled slave clock, which is a subordinate clock to record the time difference between the master clock time stamp and the system itself. However, since the time stamp data of the master clock received by the slave clock is quite large, and it is also affected by the packet transmission delay, the variation of the time difference is too large, making it difficult to apply to the time synchronization accuracy. The analysis, especially in the protection architecture of multiple precise time-protocol master clock backups, is confused by the time difference between multiple master clocks, making the time synchronization accurate measurement target difficult to achieve.

Moreover, the prior art also has a method of monitoring based on an accurate time-scheduled clock alarm, which can achieve the purpose of monitoring the precise time agreement obstacle on the line, but still cannot obtain the accuracy of time synchronization, especially on the mobile backhaul network. At the same time, although obstacles or alarms of accurate time-provision clock distribution signals can be found, it is impossible to know that the time synchronization accuracy is insufficient, and the overall system maintenance is still limited.

It can be seen that there are many shortcomings in the above-mentioned methods of use, which are not a good designer, but need to be improved. In view of the shortcomings derived from the above-mentioned conventional methods, the inventor of the present invention has improved and innovated, and after years of painstaking research, he finally succeeded in researching and developing this precise time agreement letter. No. of online monitoring systems and methods.

It is an object of the present invention to provide a monitoring system and method for accurate time-scheduled signal distribution to cooperate with a mobile backhaul network to construct a time-synchronized mechanism for precise time-of-arrival, and in the case of a precise time-scheduled signal distribution, in a general equipment room By monitoring the phase difference between the precise time-proportional master-slave clocks by the method of the present invention, it is possible to clarify whether the problem is a precise time-scheduled clock barrier or a signal distribution route, and correctly and clearly show the route and location of the obstacle. Reduce maintenance costs and improve maintenance efficiency.

The on-line monitoring system and method for accurate time-scheduled signal distribution of the present invention utilizes a phase measuring device to instantaneously monitor the phase difference between the clock of the precise time-proportional clock output and its upstream and downstream clocks, so as to simultaneously determine the position of the obstacle and Time synchronization accurately measures the purpose of the measurement; wherein the method uses a phase counter to instantaneously compare the phase difference between the clock of the precise time-sharing clock output clock and the upstream and downstream clocks, and analyzes the time synchronization through a time synchronization analysis module. Accuracy, more than a control computer integrated measurement data to determine the precise time agreement obstacle position, if the distribution of the time signal congestion or time source accuracy degradation, you can immediately switch the reference time-precision clock indicator Reorganize the precise time-boundage time synchronization hierarchy to generate alerts and the basis for subsequent processing.

In detail, the on-line monitoring system for accurate time-scheduled signal distribution of the present invention comprises: a precise time-scheduled clock that performs a precise time-of-arrival and calibrates device time to comply with the IEEE 1588-2008 standard clock; a clock generator, wherein the clock generator is configured to extract a clock output module of the timing frequency inside the precise time-scheduled clock; a phase counter for measuring a phase difference between the clock output of the clock generator and an external input clock, and measuring the phase difference by using at least two 1 PPS clock signals .

The system of the present invention further comprises a time synchronization analysis module, wherein the time synchronization analysis module is a time analysis instrument for statistically analyzing the relative phase difference data of two clock pulses in the segment time, and is used for evaluating two time. The relative accuracy of the synchronization of the clock time, and a control computer, the control computer collects the phase difference between the precise time-proportion clock and the upstream and downstream clocks to collect the long-term and short-term synchronization accuracy generated by the time synchronization analysis module. The results of the analysis are applied to the time synchronization of the packet network. The control computer is used to diagnose the route of the time synchronization accuracy disorder and automatically perform the obstacle elimination process.

The present invention also includes an end-to-end accurate time-provision signal distribution line monitoring method, the program steps including at least the following three groups.

First, the first set of steps is: the precise time-scheduled clock allocates a precise time-scheduled signal, that is, a precise time-boundted time stamp, giving a downstream boundary clock or a slave clock as a time source, and the precise time-scheduled clock is the upstream highest master clock. Or a boundary clock with a master clock function; the phase counter measures the clock phase difference of the upstream and downstream clocks after the downstream master clock locks the reference to the time source; and the control computer aggregates the long and short-term clocks of the upstream and downstream clocks. The phase difference; and the time synchronization analysis module analyzes the relative accuracy of the time synchronization between the upstream and downstream clocks.

And the second set of steps is: the precise time-proportion clock locks the reference Coordinated-Time source, that is, all the downstream slave clocks of the precise time-scheduled clock as the highest master clock also locks the time source of the traceable Coordinated Time; Phase counter measures downstream slave clocks and external global satellite navigation The phase difference between the clocks output by the system receiver, the control computer integrates the phase difference between the lengths of the two clocks, and the time synchronization analysis module analyzes the time synchronization absolute accuracy of the downstream slave clocks.

The third set of steps is: the control computer captures the phase counter through the network to measure the clock phase difference between the upstream and downstream clocks of all the precise time agreements in the distribution route, and analyzes the long-term and short-term time by the time synchronization analysis module. Synchronization relative accuracy; the control computer aggregates the relative time synchronization accuracy of all the master-slave clocks of the end-to-end end to integrate the variable data in the precise time-provision distribution route to diagnose the position of the obstacle in the accurate time-scheduled signal distribution as an alarm Or switch the basis of subsequent processes such as distribution routing, the control computer automatically executes the control command to remove the obstacle.

In the above, the monitoring system and method for accurate time-scheduled signal distribution of the present invention are explained, which is a time synchronization system and method for packet-switched networks in combination with a precise time-distributed clock-allocation time source mechanism to improve the problems of the prior art.

100‧‧‧Online Monitoring System

110‧‧‧Precise time-sharing clock unit

111‧‧‧Precise time-sharing clock

112‧‧‧ clock generator

113‧‧‧ time stamp signal

114‧‧‧ time stamp signal

115‧‧‧ clock signal

120‧‧‧phase counter

130‧‧‧Control computer

140‧‧‧Time Synchronization Analysis Module

150‧‧‧ clock signal

160‧‧‧Control order

210‧‧‧Global satellite navigation system receiver

211‧‧‧ time source

212‧‧‧ clock signal

220‧‧‧The highest master clock

221‧‧‧ time source

222‧‧‧ time source

223‧‧‧clock signal

230‧‧‧ first boundary clock

231‧‧‧ Time source

232‧‧‧clock signal

240‧‧‧second boundary clock

241‧‧‧ Time source

242‧‧‧ clock signal

250‧‧‧Subordinate clock

251‧‧‧ clock signal

260‧‧‧phase counter

270‧‧‧Monitoring network

280‧‧‧Control computer

290‧‧‧Time Synchronization Analysis Module

S301~S310‧‧‧Program steps

Please refer to the detailed description of the present invention and the accompanying drawings, which can further understand the technical content of the present invention and its function, wherein: FIG. 1 is a functional block diagram of an on-line monitoring system for precise time-scheduled signal distribution according to the present invention; The schematic diagram of the architecture of the on-line monitoring system for the precise time-scheduled signal distribution of the present invention; FIG. 3 is an online monitoring method for the precise time-scheduled signal distribution.

As shown in FIG. 1, an on-line monitoring system 100 for accurate time-scheduled signal distribution of the present invention is shown, which includes a precision time-scheduled clock unit 110 that is capable of performing precise time-of-flight and calibrating the clock of the device time IEEE 1588-2008 standard.

It further includes a precise time-protocol clock 111 that can receive the time stamp signal 113 of the upstream master clock or the time stamp signal 114 that provides the downstream slave clock or both. There is also a clock generator 112 for outputting a clock signal of the precise time-consistent clock 111, which also has a phase counter 120 for measuring the clock signal 115 outputted by the clock generator 112 and the external input clock. The phase difference of the signal 150.

The online monitoring system 100 further has a time synchronization analysis module 140, which is a software for analyzing time synchronization accuracy, and a control computer 130 for monitoring the overall process and extracting and analyzing the comparison phase counter 120 and time. The data of the analysis module 140 is synchronized to obtain the time synchronization accuracy of the precise time-scheduled clock to execute the various control commands 160.

To measure the time synchronization accuracy, the clock generator 112 should generate a 1PPS (One Pulse-Per-Second) signal 115 from the timing frequency of the precise time-scheduled clock 111 and then pass the phase counter 120 to the external input 1PPS signal 150. The phase difference between them is mainly for measuring the time difference of less than one second.

The object of the present invention is mainly applied to the monitoring of a time synchronization network, as shown in FIG. 2, which is a schematic diagram of the system architecture of the online monitoring system for precise time-bound signal distribution of the present invention, wherein the highest master clock of the precise time agreement (Grandmaster) 220 only has a master clock function, which can allocate a precise time agreement signal to the downstream first boundary clock 230. After the downstream clock locks the time source 221 of the highest master clock, the phase counter 260 compares the time of the highest master clock. The pulse signal 223 and the clock signal 232 of the downstream first boundary clock control the computer 280 to integrate the phase difference, and cooperate with the time synchronization analysis module 290 to monitor the time synchronization accuracy of the downstream first boundary clock 230.

In addition, the highest master clock 220 also provides a time source 222 for the downstream slave clock 250. After the downstream slave clock 250 locks the highest clock time source 222, the phase counter 260 compares the clock signal 223 of the highest master clock with the downstream slave clock. The pulse signal 251 controls the computer 280 to integrate the phase difference, and the time synchronization analysis module 290 can monitor the time synchronization accuracy of the downstream slave clock 250.

For the precise time protocol, the first Boundary Clock 230 has a slave clock function, and receives the time source 221 of the upstream highest master clock, and has a master clock function, and can assign the accurate time agreement signal 231 to the downstream second boundary clock 240. After the downstream clock locks the time source 231 of the first boundary clock, the phase counter 260 compares the clock signal 232 of the first boundary clock with the clock signal 242 of the downstream second boundary clock, and controls the computer 280 to adjust the phase difference. The synchronization analysis module 290 can monitor the relative accuracy of the time synchronization of the downstream second boundary clock 240. In addition, the second boundary clock 240 also provides a time source 241 for the downstream slave clock 250. After the downstream slave clock 250 locks the second boundary clock time source 241, the phase counter 260 can compare the clock signal 242 of the second boundary clock with The clock signal 251 of the downstream slave clock controls the computer 280 to integrate the phase difference, and the time synchronization analysis module 290 can monitor the relative accuracy of the time synchronization of the downstream slave clock 250.

The present invention may additionally expand the application, for example, when the precise time agreement highest master clock 220 locks the reference Coordinated Universal Time source 211, the phase counter 260 can compare the global satellite navigation system. (Global Navigation Satellite System) The clock signal 212 provided by the receiver 210 and the precise time-scheduled clocks of the traceable reference world coordinating time source 211 (including: the highest master clock 220, the first boundary clock 230, the second boundary clock 240, and The clock signal 223, 232, 242 or 251 outputted by the slave clock 250) controls the computer 280 to integrate the phase difference, and cooperates with the time synchronization analysis module 290 to monitor all the precise time-scheduled clocks (including the highest master clock 220 and the first boundary clock). Time synchronization absolute accuracy of 230, second boundary clock 240 and slave clock 250, etc.).

Referring to FIG. 3 again, it is a method step diagram of an online monitoring method for providing end-to-end precise time protocol signal distribution according to the present invention. Please refer to the system architecture of FIG. 2, wherein the preparation program S301 requires an accurate time agreement. The highest master clock 220 locks the reference time source 211 of the world coordination, and the clocks of the downstream precise time agreement are locked one by one to the time source provided by the reference upstream clock, that is, the program S302 precise time agreement first boundary clock 230 locks the reference master clock The time source 221, followed by the program S303 precise time agreement second boundary clock 240 locks the reference time source 231 of the first boundary clock, and the program S304 precise time agreement slave clock 250 locks the reference time source 241 of the second boundary clock, and the phase counter The 260 series continues to execute the programs S305, S306, and S307 as follows.

Since the present invention is an online monitoring method, the program S305 phase counter 260 compares the clock signal 232 of the first boundary clock downstream of the clock signal 223 of the highest master clock to calculate a phase difference; and the program S306 phase counter 260 compares the first A clock signal 232 of a boundary clock and a clock signal 242 of the downstream first boundary clock calculate a phase difference; and a sequence S307 compares the clock signal 242 of the second boundary clock with the clock signal 251 of the downstream slave clock. , calculate the phase difference; the above procedures S305, S306 and S307 The operation is performed 24 hours a day, and then, in step S308, the control computer 280 collects the phase difference between all the master slave clocks through the monitoring network, and then proceeds to the process S309 to send the time synchronization analysis module 290 to calculate the time synchronization relative. Accuracy, finally, in step S310, the control computer 280 analyzes the slave clock 250 to obtain the end-to-end long-term time synchronization accuracy, and diagnoses the obstacle position of the precise time-scheduled signal distribution, automatically switches the different delivery routes, and ensures the end-pair. The time synchronization accuracy of the end is used to improve the use efficiency of the monitoring system and reduce the unit cost of monitoring.

The invention is directed to the time synchronization accuracy monitoring achievable by the precise time agreement, and can monitor the time synchronization accuracy at any position on the time signal distribution route, if the time difference between the present invention and the traditional master slave clock delivery time stamp packet is compared Comparing the monitoring methods, the present invention can provide a more accurate monitoring method from end to end.

The online monitoring system and method for accurate time-scheduled signal distribution provided by the present invention have the following advantages when compared with the conventional technology:

First, the present invention can monitor the precise time-scheduled clock at the computer room end. If the application of the monitoring method is used, the time difference between the plurality of main clock signals can be avoided to improve the discrimination rate, and the present invention provides a feasible, reliable, and high efficiency. A precision time-scheduled clock time accuracy monitoring system.

Secondly, the present invention is relatively easy to implement, and it is only necessary to install a uniform phase counter at one time in an existing precise time-scheduled clock, which is suitable for monitoring various precise time-proportional clocks.

Third, the present invention can simultaneously monitor one or more precise time-protocol clocks and display the status of multiple precise time-bound signal assignments, achieve fast, massively monitored targets, and resolve accurate time-protocol signal distribution routes. The problem of obstacle location is difficult to calibrate.

Fourth, the present invention can perform long-term automatic monitoring in the equipment room to quickly and correctly clarify the obstacles of the equipment clock or the distribution route, and accumulate the relative accuracy of the relative time synchronization of each distribution route, and can perform preventive maintenance and provide better service quality.

Fifth, the invention can reduce the personnel cost of the network maintenance, and can ensure the accuracy and stability of the precise time agreement delivery time source, thereby improving the maintenance efficiency, and the economic benefit is remarkable.

The detailed description of the present invention is intended to be illustrative of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention. It is included in the patent scope of this case.

In summary, the present invention is innovative in terms of technical ideas, and also has various functions that are not in the prior art, and has fully complied with the statutory invention patent requirements of novelty and progressiveness, and has filed a patent application according to law, and invites you to approve the invention. The patent application was inspired to invent, and it was a matter of feeling.

100‧‧‧System Module

110‧‧‧Precise time-sharing clock unit

111‧‧‧Precise time-sharing clock

112‧‧‧ clock generator

113‧‧‧Upstream master clock sends timestamp signal

114‧‧‧Send downstream slave clock timestamp signal

115‧‧‧ Clock generator output 1PPS signal

120‧‧‧phase counter

130‧‧‧Control computer

140‧‧‧Time Synchronization Analysis Module

150‧‧‧External input clock signal

160‧‧‧Precise time-bound clock control commands

Claims (7)

An on-line monitoring system for precise time-scheduled signal distribution, comprising: a precise time-scheduled clock, which is a clock that performs precise time agreement and calibrates device time to comply with the IEEE 1588-2008 standard; a clock generator, The clock generator is configured to extract a clock output module of the timing frequency inside the precise time-scheduled clock; a phase counter is used to compare the clock output and the external input clock of the clock generator The phase difference measuring instrument measures the phase difference by using at least two 1PPS clock signals; a time synchronization analysis module, which is used for statistical analysis of two clocks in the section time A time analysis instrument for the relative phase difference data of the clock is used to evaluate the relative accuracy of synchronization of two clock times; and a control computer that collects the clock of the precise time-proportion clock and the upstream and downstream clocks The phase difference is used to analyze the analysis result of the long-term and short-term time synchronization accuracy generated by the time synchronization analysis module, and is applied to the packet network. Time synchronization, the control system computer to diagnose the time synchronization accuracy of the route and obstacles barriers automatic exclusion process. An on-line monitoring system for accurately assigning a time-scheduled signal according to claim 1, wherein the phase counter, the time synchronization analysis module, and the control computer are respectively disposed on different devices. An on-line monitoring system for precise time-scheduled signal distribution as described in claim 1, wherein the precise time-scheduled clock is a master clock having a master clock function, a separate slave clock, or both a master clock and a slave clock identity. a boundary clock, wherein the precise time-cycle clock passes through the The master clock function outputs the precise time-scheduled signal as a time source for other clocks. An on-line monitoring system for precise time-scheduled signal distribution as described in claim 1, wherein the clock generator is operative to generate a 1PPS signal based on the precise time-scheduled clock timing frequency. An on-line monitoring system for precise time-scheduled signal distribution as described in claim 1, wherein the phase counter compares a phase difference between any two of the 1 PPS clock signals of at least one of the complex clock signals. An online monitoring system for accurately assigning a time-scheduled signal according to claim 1, wherein the control computer is connected to the phase counter and the time synchronization analysis module to monitor an immediate situation of the overall accurate time-scheduled signal distribution. Control the computer and capture, calculate, compare and analyze the phase difference of the phase counter measurement and the time accuracy of the time synchronization analysis module analysis, so as to obtain accurate end-to-end time synchronization in the overall accurate time-protocol distribution route degree. An end-to-end precise time-provision signal distribution line monitoring method, the steps comprising at least the following three groups: a. A precise time-scheduled clock distribution precise time-scheduled signal, that is, a precise time-boundted time stamp, given to a downstream boundary clock or a slave clock The time source, the precise time-scheduled clock is the upstream highest master clock or the boundary clock with the main clock function; a phase counter is used to measure the clock phase difference of the upstream and downstream clocks after the downstream main clock is locked and referenced to the time source; a control computer aggregates the long-term and short-term clock phase differences of the upstream and downstream clocks; a time synchronization analysis module analyzes the relative accuracy of the time synchronization between the upstream and downstream clocks; b. the precise time-bound clock locks the reference world coordination time source, that is, Make All downstream slave clocks for the precise time-scheduled clock for the highest master clock also lock the time source of traceable Coordinated Time; the phase counter measures the downstream slave clock and the clock output from the external global satellite navigation system receiver The phase difference between the control computer accommodates the phase difference between the two clocks, the time synchronization analysis module analyzes the time synchronization absolute accuracy of the downstream slave clock; and c. the control computer captures the phase counter amount through the network Measure the clock phase difference between the upstream and downstream clocks of all the precise time agreements in the distribution route, and analyze the relative accuracy of the long-term and short-term time synchronization by the time synchronization analysis module; the control computer collects the relative of all the master-slave clocks of the opposite end of the operation end Time synchronization accuracy to integrate the variable data in the routing routing of the precise time agreement to diagnose the location of the obstacles caused by the accurate time agreement signal distribution as the basis for the subsequent process such as issuing an alarm or switching the routing route, the control computer automatically performs the obstacle removal control commands.