KR101977014B1 - Clock synchronization system improved clock accuracy through competition with Grand Master clocks - Google Patents

Abstract

The present invention relates to a clock synchronization system in which precision is improved through competition between grand master clocks, wherein a slave clock device determines a best grand master clock device through quality competition of grand master clock devices, So that precise clock synchronization can be performed using the master master clock of the clock device.

Description

[0001] The present invention relates to a clock synchronization system and a clock synchronization system,

The present invention relates to a clock synchronization technique, and more particularly to a clock synchronization system that improves precision through competition between grand master clocks.

The range of specifications such as the warranty period and the temperature required by electric products is very wide. In particular, the oscillator or PLL changes the pulse per minute (PPM) of the output value with respect to time, temperature, and vibration. Even though the clock quality changes, the static time synchronization system does not respond dynamically to the changing environment during BMCA (Best Master Clock Algorithm) operation.

Therefore, it is necessary to select dynamic master clock (GM) to improve precision by changing the time, temperature, path, etc., Time synchronization technology is required.

Korean Patent No. 10-1596759 (Feb.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide a master clock apparatus and a master clock apparatus which can determine a best GM master clock apparatus through quality competition of grand master clock apparatuses, And a clock synchronization system in which precision is improved through competition between grand master clocks capable of performing clock synchronization.

According to an aspect of the present invention, there is provided a clock synchronization system including a plurality of grand masters (GMs) for transmitting clock selection reference information together with its own grand master clock, : Grand Master) clock devices; Determining a best GM best clock device among the grandmaster (GM) clock devices based on the clock selection reference information transmitted by each of the grand master (GM) clock devices, At least one slave clock device for updating and synchronizing its clock with the grand master clock transmitted by the clock device; And the like.

According to a further aspect of the present invention, the slave clock device compares the clock selection reference information transmitted by each of the grand master (GM) clock devices to compute the grand master clock quality of each of the grand master (GM) And determines a grand master clock device having a grand master clock quality with the highest quality as a best GM master clock device.

According to a further aspect of the present invention, the clock selection reference information includes the manufacturing time of the grandmaster clock device, the operating temperature, and the path length.

According to a further aspect of the present invention, the slave clock device receives the grand master clock and clock selection reference information from a plurality of grand master (GM) clock devices in real time or periodically and updates its own clock .

According to a further aspect of the present invention, the grandmaster clock device corrects and updates its own grandmaster clock in response to a change in the surrounding environment.

According to a further aspect of the present invention, the grandmaster clock device stores in advance a PPM (Pulse Per Minute) error for the environment variables, and stores a PPM value for environment variables in the current environment of the corresponding grandmaster clock device And the grand master clock is corrected by reflecting the error.

Since the slave clock device can determine the best GM clock device through quality competition of the grand master clock devices and perform clock synchronization using the determined grand master clock of the best grand master clock device, Precise clock synchronization is possible.

FIG. 1 is a block diagram showing a configuration of a clock synchronizing system in which precision is improved through competition between grand master clocks according to the present invention.
FIG. 2 is a flowchart illustrating a clock synchronization process of a clock synchronization system in which precision is improved through competition between grand master clocks according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The terms used throughout the specification of the present invention have been defined in consideration of the functions of the embodiments of the present invention and can be sufficiently modified according to the intentions and customs of the user or operator. It should be based on the contents of.

FIG. 1 is a block diagram showing a configuration of a clock synchronizing system in which precision is improved through competition between grand master clocks according to the present invention. As shown in FIG. 1, a clock synchronization system, which improves accuracy through competition between grand master clocks according to the present invention, includes a plurality of grand master (GM) clock devices 100, at least one slave clock Device 200 as shown in FIG.

For example, when a clock synchronization system in which precision is improved through competition between grand master clocks according to the present invention is applied to a vehicle, a grand master (GM) is assigned to each of some ECUs among a plurality of ECUs (Electronic Control Units) : Grand Master) clock device 100, and the slave clock device 200 in each of the remaining ECUs.

The Grand Master clock device 100 transmits clock selection reference information together with its own grand master clock. At this time, the clock selection reference information may include the manufacturing time, operating temperature, and path length of the grand master clock device associated with clock degradation.

Generally, a grand master clock device with a long manufacturing time has a severe clock degradation, a grand master clock device with a high operating temperature has a severe clock degradation, and a grand master clock device with a long clock transmission path length has a serious clock degradation. Falls.

Thus, the slave clock device may use the manufacturing time, operating temperature, and path length of the grand master clock devices associated with clock degradation as the clock selection reference information that is referred to in selecting the best grand master clock device.

The slave clock device 200 is configured to receive a best-of-breed best-grandmaster (Best GM) among the grandmaster (GM) clock devices based on the clock selection reference information transmitted by each of the grand- ) Clock device and updates its clock with the grand master clock transmitted by the determined best grand master clock device to synchronize.

At this time, the slave clock apparatus 200 compares the clock selection reference information transmitted by each of the grand master (GM) clock apparatuses 100 to calculate a grand master clock quality of each of the grand master (GM) clock apparatuses And determine a grand master clock device with the best quality of the grand master clock quality as the best GM master clock device.

For example, when the slave clock device 200 compares the clock selection reference information transmitted by each of the grand master (GM) clock devices 100, the grand master clock device having a relatively long manufacturing time has a relatively low value A relatively low value is given to a relatively large grand master clock device having a relatively high operating temperature and a relatively low value is given to a relatively large grand master clock device having a relatively long clock transmission path length, It can be implemented to determine the highest grand master clock device as the best grand master (GM) clock device.

At this time, a best GM master clock device may be determined by applying a different weight to each of the manufacturing time, the operating temperature, and the path length of the grand master clock device included in the clock selection reference information.

The slave clock device 200 is connected to the grand master clock devices 100 through a communication method such as Ethernet, Bluetooth, or CAN (Carrier Area Network) Lt; RTI ID = 0.0 > reference information. ≪ / RTI >

Meanwhile, the slave clock device 200 can be implemented to receive the grand master clock and clock selection reference information from a plurality of grand master (GM) clock devices 100 in real time or periodically, and to update its own clock.

In accordance with the present invention, the slave clock device 200 ranks the quality of the grand master clock devices through the clock selection reference information comparison of the grand master clock devices 100, thereby obtaining the best grand master The best GM clock device is determined and synchronized to the determined grand master clock of the best GM master clock device, thereby enabling simple and precise clock synchronization.

According to a further aspect of the invention, the grandmaster clock device 100 may be implemented to correct and update its own grandmaster clock in response to changes in the surrounding environment. At this time, the grand master clock correction of each of the grand master clock devices 100 can be performed in real time or periodically.

For example, when the grand master clock apparatus 100 stores a pulse per minute error (PPM) for environmental variables in a memory (not shown) in advance, and stores the environmental variables in the current environment of the corresponding grand master clock apparatus May be implemented to correct the grandmaster clock to reflect the PPM error. At this time, the environmental variables may be manufacturing time, operating temperature, clock transmission path length, etc. of the grand master clock device associated with clock degradation.

For example, a PPM (Pulse Per Minute) error is set in advance according to the manufacturing time of the grandmaster clock device, the operating temperature of the grandmaster clock device, and the clock transmission path length between the grandmaster clock device and the slave clock device, , The current production time of the grandmaster clock device, the current operating temperature of the grandmaster clock device, the pulse per minute (PPM) error corresponding to the current clock transmission path length between the grandmaster clock device and the slave clock device, The master clock apparatus 100 itself can calibrate its own grand master clock.

Accordingly, each of the grandmaster clock devices 100 sends the self-calibrated grandmaster clocks to the slave clock device 200 together with the clock selection reference information, and the slave clock device 200 transmits the self-calibrated grandmaster clocks to the grandmaster clock devices 100 Clock synchronization can be performed by selecting the grand master clock of the best grand master clock device selected based on the clock selection reference information among the grand master clocks corrected by each, thereby enabling more precise clock synchronization.

The clock synchronization operation of the clock synchronization system in which the precision is improved through the competition between the grand master clocks according to the present invention as described above will be described with reference to FIG. FIG. 2 is a flowchart illustrating a clock synchronization process of a clock synchronization system in which precision is improved through competition between grand master clocks according to the present invention.

First, in step 310, the grandmaster clock devices transmit clock selection reference information along with their grand master clock. At this time, the clock selection reference information may include the manufacturing time, operating temperature, and path length of the grand master clock device associated with clock degradation.

Then, in step 320, the slave clock device receiving the clock selection reference information and the grand master clock of the grand master clock devices transmitted by the step 310 compares the reference clock information of the grand master clock devices with the grand master clock Ranking the grandmaster clock quality of the devices.

Then, in step 330, the slave clock device determines, by step 320, the grandmaster clock device having the highest quality grandmaster clock quality as the best grandmaster clock device as a result of quality ranking.

Then, in step 340, the slave clock device updates its own clock with the grand master clock of the Grand Master (Best GM) clock device determined as the best GM master clock device by the above step 330 to perform clock synchronization.

In accordance with the present invention, the slave clock device determines the best GM master clock device through quality competition of the grand master clock devices and performs clock synchronization using the determined grand master clock of the best grand master clock device Therefore, it is possible to achieve a simple and precise clock synchronization, so that the object of the present invention can be achieved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. .

The present invention is industrially applicable in the field of clock synchronization technology and its application field.

100: Grand master clock device
200: Slave clock device

Claims (6)

A plurality of grand master (GM) clock devices for transmitting clock selection reference information, including manufacturing time, operating temperature, path length, associated with clock degradation, along with its own grand master clock;
Based on the clock selection reference information transmitted by each of the grand master (GM) clock devices, a relatively low value is given to a grand master clock device having a relatively long manufacturing time, and a relatively high value of a grand master clock A relatively low value is given to a grandmaster clock device having a relatively long clock transmission path length, a relatively low value is given to a grandmaster clock device having a relatively long clock transmission path length, and a grand master clock device having the highest value At least one slave clock device for determining a best GM master clock device with a grand master clock quality and for updating and synchronizing its clock with the grand master clock transmitted by the determined best grand master clock device;
And a clock synchronization system for improving accuracy through competition between grand master clocks. delete delete The method according to claim 1,
Wherein the slave clock device comprises:
A method of controlling a clock synchronization system, comprising: receiving a grand master clock and clock selection reference information from a plurality of grand master (GM) clock devices in real time or periodically and updating their own clocks; . The method according to claim 1 or 4,
Wherein the grand master clock device comprises:
And correcting and updating its own grand master clock in response to a change in the surrounding environment. 6. The method of claim 5,
Wherein the grand master clock device comprises:
And a grand master clock is corrected by reflecting a PPM error of environment variables in the current environment of the corresponding grandmaster clock device in advance by storing a PPM (Pulse Per Minute) error for environment variables in a memory in advance, A clock synchronization system that improves precision through competition between master clocks.

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