WO2012155772A1

WO2012155772A1 - Time failure monitoring method and system

Info

Publication number: WO2012155772A1
Application number: PCT/CN2012/074617
Authority: WO
Inventors: 夏靓; 何力
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-05-19
Filing date: 2012-04-24
Publication date: 2012-11-22
Also published as: CN102790703A; CN102790703B

Abstract

Disclosed are a time failure monitoring method and system. The method comprises: a monitored node in a ring network measuring a clockwise time error and/or anticlockwise time error of the node with respect to a time reference point in a clockwise direction and/or anticlockwise direction of the ring network; and monitoring a time failure according to the clockwise time error and/or anticlockwise time error. According to that time errors obtained by a random node in the ring network in the clockwise direction and the anticlockwise direction are approximately the same, so the present invention monitors the time failure through monitoring the time error, thereby improving maintenance efficiency and reducing application cost.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a time fault monitoring method and system. BACKGROUND OF THE INVENTION Precise Time Protocol (PTP) specifies a method of network synchronization, which ensures time synchronization of a slaver and a master by measuring delay. However, in actual engineering, there are other interference factors (such as equipment failure, defects, and line asymmetry) that cause the slave to be out of sync with the master. In the related art, when a time failure occurs, the faulty device can only be monitored one by one using a Global Position System (GPS) receiver. However, this method has low maintenance efficiency and high application cost. SUMMARY OF THE INVENTION Embodiments of the present invention provide a time fault monitoring method and system, so as to at least solve the problem of low frequency maintenance and high application cost by using a GPS receiver to monitor faulty devices one by one in the related art. In order to achieve the above object, an embodiment of the present invention provides a time fault monitoring method. A time fault monitoring method according to an embodiment of the invention includes: measuring a clockwise time error and/or inverse of a monitored node in a ring network along a clockwise and/or counterclockwise direction of the ring network relative to a time reference point Hour hand time error; monitors time failure based on clockwise time error and/or counterclockwise time error. Measuring the clockwise time error of itself relative to the time reference point includes: measuring its own line delay time to the time reference point; measuring the transmission time of its own clockwise transmission of the message to the time reference point; calculating the time error equal to the transmission time minus the line delay Time. The sending time for measuring the clockwise transmission of the message to the time reference point includes: recording the transmission timestamp of sending the message clockwise by itself; determining the timestamp of receiving the message by the time reference point; calculating the sending time equal to the receiving timestamp indication Time minus the time indicated by the timestamp. Determining the timestamp of receiving the message by the time reference point comprises: receiving a response message from the time reference point, wherein the response message includes a receiving timestamp; and from the response message, extracting the receiving timestamp. After receiving the response message from the time reference point, the method further includes: extracting a correction time from the response message; calculating a time equal to the time of receiving the timestamp indication minus the time of the transmission timestamp indication, and further reducing the correction time . Based on the clockwise time error and/or the counterclockwise time error, the monitoring time fault includes: determining whether the clockwise time error is greater than a unilateral alarm threshold of a predetermined clockwise time error, and/or determining whether the counterclockwise time error is A unilateral alarm threshold greater than a preset counterclockwise time error; if the determination is yes, it is determined that there is a time failure in the clockwise direction and/or the counterclockwise direction. If the judgment result is no, it is determined whether the difference between the clockwise time error and the counterclockwise time error is greater than a bilateral alarm threshold value of a preset time error, and if the difference is greater than the bilateral alarm threshold value, There is a time failure in the clockwise direction and/or counterclockwise direction. Before measuring a clockwise time error and/or a counterclockwise time error of the self relative to the time reference point, the method further includes: determining a node time reference point among the plurality of nodes in the ring network; determining the plurality of junctions The other nodes in the point other than the time reference point are used as the monitored nodes; setting each of the monitored nodes to perform the clockwise time error and/or counterclockwise time of the measurement itself relative to the time reference point The operation of the error. After monitoring the time fault according to the clockwise time error and/or the counterclockwise time error, the method further includes: determining the time of each monitored node according to the monitoring result of the monitoring time fault of each monitored node Degree; Determine the time synchronization reliability of the ring network based on the confidence of the time of each monitored node. In order to achieve the above object, an embodiment of the present invention provides a time fault monitoring system. A time fault monitoring system according to an embodiment of the present invention includes a monitored node and a time reference point, wherein the monitored node includes: a measuring module configured to be clockwise and/or counterclockwise along the ring network, measuring itself relative to Clockwise time error and/or counterclockwise time error of the time reference point; the monitoring module is configured to monitor the time fault based on a clockwise time error and/or a counterclockwise time error. The time error obtained from the clockwise direction and the counterclockwise direction of any node in the ring network is approximately the same according to the embodiment of the present invention. Therefore, the time fault is monitored by monitoring the time error, thereby improving maintenance efficiency and reducing application cost. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of a ring network according to an embodiment of the present invention; FIG. 2 is a flowchart of a time failure monitoring method according to an embodiment of the present invention; FIG. 3 is a time failure monitoring system according to an embodiment of the present invention. Structure diagram. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. 1 is a schematic diagram of a ring network according to an embodiment of the present invention. As shown in FIG. 1, node 1 is a time reference point, and other nodes (2, 3, 4, 5, 6) are monitored nodes. Based on the ring network of Figure 1, the present invention provides a time failure monitoring method. FIG. 2 is a flowchart of a time failure monitoring method according to an embodiment of the present invention. As shown in FIG. 2, the following steps S202 to S204 are included. Step S202, the monitored node in the ring network measures its clockwise time error and/or counterclockwise time error with respect to the time reference point along the clockwise and/or counterclockwise direction of the ring network. Step S204, monitoring the time fault according to the clockwise time error and/or the counterclockwise time error. In the related art, a GPS receiver is used to monitor a faulty device one by one, thereby providing low maintenance efficiency and high application cost. In the embodiment of the present invention, considering that the time error of any node in the ring network obtained from the clockwise direction and the counterclockwise direction is approximately the same, the time fault is monitored by monitoring the time error, thereby improving maintenance efficiency and reducing application cost. Since the time error obtained by the clockwise direction and the counterclockwise direction of any node in the ring network is approximately the same in the embodiment, the present invention can be used in the case where the ring network is a symmetric network. Better improve maintenance efficiency. Preferably, measuring the clockwise time error of the self relative to the time reference point comprises: measuring the line delay time of the self to the time reference point; measuring the sending time of sending the message clockwise to the time reference point; calculating the time error equal to the sending time Reduce the line delay time. The preferred embodiment describes in detail how the monitored node measures its clockwise time error relative to the time reference point. At the same time, the clockwise time error of the monitored node measurement itself relative to the time reference point may be the same or In a similar manner, to avoid the introduction of non-essential in clockwise and counterclockwise measurements

In addition, the preferred embodiment can measure the delay time of the line to the time reference point in a peer-to-peer manner, and the message sent by the monitored node can be a unicast P2P delay test message. Moreover, the non-monitoring node in the ring network can transparently process the unicast P2P delay test packet. Preferably, the measurement time of sending the message clockwise to the time reference point is: recording the transmission time stamp of the message sent by the clock itself; determining the time stamp of receiving the message by the time reference point; calculating the sending time is equal to the receiving time The time indicated by the stamp minus the time indicated by the time stamp. Preferably, the receiving the timestamp of receiving the message by the time reference point comprises: receiving a response message from the time reference point, where the response message includes a receiving timestamp; and from the response message, extracting the receiving timestamp. In the preferred embodiment, it is assumed that the clockwise and counterclockwise transmission timestamps of the monitored node records are t3_left and Pt3_right, and the received time stamps included in the response message are t4_left and t4_right, and the monitored nodes are monitored. The transmission time of the clockwise transmission message obtained by the point measurement is t4_left - t3_left, and the transmission time of the counterclockwise transmission message measured by the monitored node is t4_right - t3_right. Preferably, after receiving the response message from the time reference point, the method further includes: extracting a correction time from the response message; calculating a time equal to the time of receiving the timestamp indication minus the time of the transmission timestamp indication, and then Reduce the correction time. In the preferred embodiment, in the above-mentioned hypothetical technique, if the response message further includes clockwise direction and counterclockwise correction time is correct_left and correct_right, the clockwise transmission packet sent by the monitored node is sent. The time is t4_left - t3_left - correctjeft, and the transmission time of the counterclockwise transmission message measured by the monitored node is t4_right - t3_right - correct_right. Further, assuming that the line delay times of the monitored node from the clockwise direction and the counterclockwise direction to the time reference point are line_delay_left and line_delay_right, respectively, the clockwise time error and the counterclockwise time error in the present invention can pass the following formula (1) and formula (2) are calculated. Diff—left = t4_left - t3_left - correct—left - line—delay—left ( 1 )

Diff—right = t4_right - t3_right - correct—right - line—delay—right (2) Preferably, according to the clockwise time error and/or the counterclockwise time error, the monitoring time fault includes: determining whether the clockwise time error is greater than a preset a unilateral alarm threshold for a clockwise time error, and/or a unilateral alarm threshold for determining whether the counterclockwise time error is greater than a predetermined counterclockwise time error; if the determination is yes, then determining a clockwise There is a time failure in the direction and/or counterclockwise direction. Considering that the time failure is usually a run-down fault, a time-calculated fault, and these faults will cause a one-sided alarm in either a clockwise direction or a counterclockwise direction. Therefore, in the preferred embodiment, it is first determined whether the monitored node has a clockwise direction. Or one-sided time failure in a counterclockwise direction to ensure the efficiency and accuracy of time fault monitoring. Preferably, if the determination result is no, it is determined whether the difference between the clockwise time error and the counterclockwise time error is greater than a bilateral alarm threshold value of the preset time error, and the difference is greater than the bilateral alarm threshold value. Next, determine that there is a time failure in the clockwise direction and/or counterclockwise direction. Considering that the time failure may also be an asymmetrical fault, and these faults may cause a bilateral alarm in the clockwise direction and the counterclockwise direction. Therefore, the preferred embodiment determines that there is no clockwise or counterclockwise direction of the monitored node. The side time fault, and then determine whether there is a bilateral time fault in the clockwise direction and the counterclockwise direction of the monitored node, thereby ensuring the accuracy of the time fault monitoring. Preferably, before measuring a clockwise time error and/or a counterclockwise time error of the self relative to the time reference point, the method further comprises: determining a node time reference point among the plurality of nodes in the ring network; determining a node other than the time reference point among the plurality of nodes as the monitored node; setting each of the monitored nodes to perform a clockwise time error of the measurement itself relative to the time reference point and/or Counterclockwise time error operation. In the preferred embodiment, the same monitoring mechanism can be established for all monitored nodes except the time reference point in the ring network to ensure uniformity of time fault monitoring, thereby ensuring efficiency and accuracy. Preferably, after monitoring the time fault according to the clockwise time error and/or the counterclockwise time error, the method further comprises: determining, according to the monitoring result of the monitoring time fault of each monitored node, determining the monitored node Confidence of time; Determine the time synchronization reliability of the ring network based on the confidence of the time of each monitored node. Preferably, the monitored node is a platform 1588 node, and for a unicast P2P delay test message that is not the target of the monitored node, it can be forwarded according to the TC transparent transmission mode. The implementation process of the embodiment of the present invention is described in detail below by taking the monitored node 4 as an example. The monitored node 4 initiates a Pdelay line delay measurement mechanism from the left and right rings to the time reference point 1, respectively, and obtains the line delay times line_delay_left and line_delay_right respectively. The monitored node 4 sends a unicast delay_req message from the left and right rings to the time reference point 1, and records the transmission time stamps of the left and right rings delay_req, t3_left and t3_right. The monitored node 2, the monitored node 3, the monitored node 5, and the monitored node 6 perform TC processing on the delay_req message. The time reference point 1 receives the delay_req message from the left and right rings, records the respective reception time stamps t4_left and t4_right, and generates corresponding delay_resp messages. The monitored node 4 receives the delay_resp message from the left and right rings, and extracts t4_left and t4_right and correct-left and right-right. Calculate diffjeft and diff_right according to the following formula (1) and formula (2), and determine whether there is an alarm according to the unilateral alarm threshold.

Diff—left =t4_left-t3_left-correct_left-line_delay_left ( 1 ) DifF right =t4_right-t3_right-correct_right-line_delay_right (2) If neither Diffjeft nor Diff_right exceeds the one-sided alarm threshold, then Diffjeft -

Whether Diff_right exceeds the bilateral alarm threshold to determine whether an alarm is required. In the same way, at the monitored node 2, the monitored node 3, the monitored node 5, the monitored node 6 establish the same supervision

If the device is running dead on the monitored node 3, the network management of the ring network is known. If the monitored node 3 has a time calculation abnormality, the monitored node 3 and the monitored node 4 may report

If there is an asymmetry fault between the monitored node 2 and the monitored node 3, an alarm may occur on the monitored node 2, the monitored node 3, and the monitored node 4. It should be noted that the steps shown in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and, although the logical order is shown in the flowchart, in some cases, The steps shown or described may be performed in an order different than that herein. The embodiment of the invention provides a time fault monitoring system, which can be applied to a ring network and used to implement the time fault monitoring method described above. 3 is a structural block diagram of a time fault monitoring system according to an embodiment of the present invention. As shown in FIG. 3, the monitored node 32 and the time reference point 34 are included, wherein the monitored node 32 includes a measurement module 322 and a time fault monitoring module. 324. The structure is described in detail below. The measurement module 322 is configured to measure a clockwise time error and/or a counterclockwise time error with respect to the time reference point along the clockwise and/or counterclockwise direction of the ring network; the monitoring module 324 is connected to the measurement module 322, The time fault is monitored to be based on a clockwise time error and/or a counterclockwise time error measured by the measurement module 322. It should be noted that the time fault monitoring system described in the device embodiment corresponds to the foregoing method embodiment, and the specific implementation process has been described in detail in the method embodiment, and details are not described herein again. In summary, according to the above embodiments of the present invention, a time failure monitoring method and system are provided. The time error obtained from the clockwise direction and the counterclockwise direction of any node in the ring network is approximately the same according to the embodiment of the present invention. Therefore, the time fault is monitored by monitoring the time error, thereby improving maintenance efficiency and reducing application cost. Industrial Applicability The technical solution of the present invention has industrial applicability. The time error obtained from the clockwise direction and the counterclockwise direction of any node in the ring network is approximately the same according to the embodiment of the present invention. Therefore, the time fault is monitored by monitoring the time error, thereby improving maintenance efficiency and reducing application cost. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. A time failure monitoring method, comprising:

The monitored node in the ring network measures its clockwise time error and/or counterclockwise time error with respect to the time reference point in a clockwise and/or counterclockwise direction of the ring network;

Time faults are monitored based on the clockwise time error and/or the counterclockwise time error.

2. The method of claim 1 wherein measuring a clockwise time error of itself relative to a time reference point comprises:

Measuring its own line delay time to the time reference point;

Measuring the time at which the clock is sent clockwise to the time reference point;

Calculating the time error is equal to the transmission time minus the line delay time.

3. The method according to claim 2, wherein measuring the transmission time of transmitting the message clockwise to the time reference point by itself comprises:

Recording the time stamp of sending the message by itself clockwise;

Determining that the time reference point receives the reception time stamp of the message;

The time at which the transmission time is equal to the time indicated by the reception time stamp minus the time indication of the transmission time stamp is calculated.

The method according to claim 3, wherein determining that the time reference point receives the received time stamp of the message comprises:

Receiving a response message from the time reference point, where the response message includes the receiving time stamp;

Extracting the reception time stamp from the response message.

The method according to claim 4, wherein, after receiving the response message from the time reference point, the method further includes:

Extracting a correction time from the response message;

Calculating the time when the sending time is equal to the time indicated by the receiving time stamp minus the time indicated by the sending time stamp, and further reducing the correcting time. The method according to any one of claims 1 to 5, wherein monitoring the time failure according to the clockwise time error and/or the counterclockwise time error comprises:

Determining whether the clockwise time error is greater than a unilateral alarm threshold of a preset clockwise time error, and/or determining whether the counterclockwise time error is greater than a pre-set counterclockwise time error unilateral alarm gate Limit value

If the result of the determination is YES, it is determined that there is a time failure in the clockwise direction and/or the counterclockwise direction. The method according to claim 6, wherein if the determination result is no, determining whether a difference between the clockwise time error and the counterclockwise time error is greater than a bilateral alarm threshold value of a preset time error, And if the difference is greater than the bilateral alarm threshold, determining that there is a time failure in the clockwise direction and/or the counterclockwise direction. The method according to any one of claims 1 to 5, wherein, before measuring a clockwise time error and/or a counterclockwise time error of the self relative to the time reference point, the method further comprises:

Determining, by a node, the time reference point in a plurality of nodes in the ring network; determining, among the plurality of nodes, other nodes than the time reference point as the monitored node; Each of the monitored nodes is operated by the monitoring node to measure a clockwise time error and/or a counterclockwise time error of itself relative to the time reference point. The method of claim 8, wherein after monitoring the time fault based on the clockwise time error and/or the counterclockwise time error, the method further comprises:

Determining the confidence of the time of each of the monitored nodes according to the monitoring result of the monitoring time failure of each of the monitored nodes;

The time synchronization reliability of the ring network is determined based on the confidence of the time of each of the monitored nodes. A time fault monitoring system includes a monitored node and a time reference point, wherein the monitored node includes:

a measurement module configured to measure a clockwise time error and/or a counterclockwise time error of the time reference point relative to the time reference point along a clockwise and/or counterclockwise direction of the ring network;

A monitoring module is arranged to monitor the time fault based on the clockwise time error and/or the counterclockwise time error.