CN102201904B - Method, device and system for determining clock tracking ring formation - Google Patents
Method, device and system for determining clock tracking ring formation Download PDFInfo
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- CN102201904B CN102201904B CN2010101303751A CN201010130375A CN102201904B CN 102201904 B CN102201904 B CN 102201904B CN 2010101303751 A CN2010101303751 A CN 2010101303751A CN 201010130375 A CN201010130375 A CN 201010130375A CN 102201904 B CN102201904 B CN 102201904B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
Abstract
The embodiment of the invention provides a method, device and system for determining clock tracking ring formation, which relate to the field of communication and can be used for quickly and accurately determining clock tracking ring formation. According to the solution, the method comprises the following steps of: receiving a first message which carries a grandmaster clock heartbeat signal transmitted by a grandmaster clock in a network; judging whether the heartbeat signal carried in the first message is the same as a heartbeat signal carried in a second message previously received from the grandmaster clock; if the heartbeat signal carried in the first message is different from the heartbeat signal carried in the second message previously received from the grandmaster clock, determining that clock tracking ring formation does not occur in the network and that the first message is normal; and if the heartbeat signal carried in the first message is the same as the heartbeat signal carried in the second message previously received from the grandmaster clock, determining that clock tracking ring formation occurs in the network and that the first message is abnormal. The embodiment of the invention is applied to clock tracking.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method, Apparatus and system of definite clock tracking ring formation.
Background technology
IEEE 1588 standard definitions a kind of in the measurement and control system that technology synergies such as communication network, local computing, distributed objects is used, can realize the agreement of exact time synchronization.Agreement is applicable to support the local area network communication system of cast communication, can be with network and the local clock computational resource cost of minimum, make have different inherent accuracies, the different system of resolution, stability clock can be synchronized with master clock (Grandmaster Clock), and reach the scope of system-wide synchronous accuracy submicrosecond level.
The synchronization principles of the IEEE 1588 described agreements of standard mainly contains 2 following points:
1, set up the host-guest architecture of clock by the clock grade information in multicast message;
2, pass through the protocol massages of the free information of exchange zone between the principal and subordinate, from clock tracing to the master clock time.
Set up the host-guest architecture of clock by the clock grade information in multicast message Announce (announcement), finally on network topology, network can form a tree.When network changed, consultation had rebulid new tree.
For avoiding spanning tree Cheng Huan in forming process, one of existing solution is to add a Pre_Master state when port status is transitioned into Master (master) attitude.Like this, before entering Master, can enter an intermediateness Pre_Master due to port, and can't externally send message under the Pre_Master state.Arrive the stand-by period during condition that Pre_Master enters Master, namely the equipment away from more from master clock, wait for that from other states the time that enters Master is longer.In theory, in this waiting process, equipment can receive the message information of renewal, thereby reduces the possibility that ring occurs following the tracks of into to a certain extent.
But inventor's discovery, this scheme can not fundamentally be determined clock tracing Cheng Huan, for example the stand-by period of Pre_Master arrives, when equipment is not still received the message of renewal; Perhaps, message itself existing problems etc. situation.
Existing another solution is to determine clock tracing Cheng Huan by the judgement of step-length.Network topological diagram after encircling by one-tenth can find, the message of mistake does not have the source, there is no the message in source through the equipment on each ring the time, and step-length all needs from increasing, and illustrates that this information passed through a jumping equipment.Owing to there is no the source, certainly increasing forever of step-length can't stop.If the step-length of the message of receiving just thinks that greater than 0xff (hexadecimal, converting the decimal system to is 255) this message is unavailable.
But inventor's discovery, there is a problem in this scheme, must wait until that exactly step-length is accumulated to 0xff, and network could be found mistake, that is to say to find that the wrong time is relatively slow.
Summary of the invention
Embodiments of the invention provide a kind of method, Apparatus and system of definite clock tracking ring formation, can fast and accurately determine clock tracking ring formation.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of method of definite clock tracking ring formation comprises:
Receive the first message that carries this master clock heartbeat signal that the master clock in network sends;
Judge whether the heartbeat signal that carries in described the first message is identical with the last heartbeat signal that carries from the second message that described master clock receives;
If the heartbeat signal that carries in described the first message is different from the last heartbeat signal that carries, determine that clock tracing Cheng Huan does not occur described network, and described the first message is normal from the second message that described master clock receives;
If the heartbeat signal that carries in described the first message is identical with the last heartbeat signal that carries, determine described network generation clock tracing Cheng Huan, and described the first message is abnormal from the second message that described master clock receives.
A kind of synchronizer comprises:
Receiving element is for first message that carries this master clock heartbeat signal of the master clock transmission that receives network;
Judging unit is for judge whether the heartbeat signal that described the first message carries is identical with the last heartbeat signal that carries from the second message that described master clock receives; If the heartbeat signal that carries in described the first message is different from the last heartbeat signal that carries, determine that clock tracing Cheng Huan does not occur described network, and described the first message is normal from the second message that described master clock receives; If the heartbeat signal that carries in described the first message is identical with the last heartbeat signal that carries, determine described network generation clock tracing Cheng Huan, and described the first message is abnormal from the second message that described master clock receives.
A kind of clock tracing system comprises master clock and synchronizer, wherein:
Described synchronizer is for first message that carries this master clock heartbeat signal of the described master clock transmission that receives network; Judge whether the heartbeat signal that carries in described the first message is identical with the last heartbeat signal that carries from the second message that described master clock receives; If the heartbeat signal that carries in described the first message is different from the last heartbeat signal that carries, determine that clock tracing Cheng Huan does not occur described network, and described the first message is normal from the second message that described master clock receives; If the heartbeat signal that carries in described the first message is identical with the last heartbeat signal that carries, determine described network generation clock tracing Cheng Huan, and described the first message is abnormal from the second message that described master clock receives.
The method of definite clock tracking ring formation that the embodiment of the present invention provides, Apparatus and system, synchronizer receives the first message that carries this master clock heartbeat signal that the master clock in network sends, judge whether the heartbeat signal that carries in this first message is identical with the last heartbeat signal that carries from the second message that master clock receives, if different in the heartbeat signal in the first message and the second message that receives before, illustrate that this first message is sent out by master clock, good for use; If identical in the heartbeat signal in the first message and the second message that receives before illustrates that the non-master clock of this first message sends out, and be extremely unavailable, determine to have occurred in network tracking loop.Like this, the downstream synchronizer just can be pinpointed the problems in clock tracing Cheng Huan, thereby can fast and accurately determine clock tracing Cheng Huan.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The block diagram of the method for definite clock tracking ring formation that Fig. 1 provides for the embodiment of the present invention;
The clock tracing network diagram that Fig. 2 provides for further embodiment of this invention;
The schematic flow sheet of the method for definite clock tracking ring formation that Fig. 3 provides for the embodiment of the present invention;
The structured flowchart one of the synchronizer that Fig. 4 provides for the embodiment of the present invention;
The structured flowchart two of the synchronizer that Fig. 5 provides for the embodiment of the present invention;
The structured flowchart of Fig. 6 provides for the embodiment of the present invention clock tracing system.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The method of definite clock tracking ring formation that the embodiment of the present invention provides, as shown in Figure 1, the method step comprises:
The first message that carries this master clock heartbeat signal that master clock in S101, reception network sends.
Concrete, master clock can utilize a byte in message to carry the heartbeat signal of this master clock.Like this, the expense of use is little, has just taken a reserve bytes in the message.
S102, judge whether the heartbeat signal that carries in this first message is identical with the last heartbeat signal that carries from the second message that master clock receives.
If the heartbeat signal that carries in S103 the first message is different from the last heartbeat signal that carries, determine that clock tracing Cheng Huan does not occur this network, and the first message is normal from the second message that master clock receives.
If the heartbeat signal that carries in S104 the first message is identical with the last heartbeat signal that carries, determine this network generation clock tracing Cheng Huan, and the first message is abnormal from the second message that master clock receives.
The method of definite clock tracking ring formation that the embodiment of the present invention provides, synchronizer receives the first message that carries this master clock heartbeat signal that the master clock in network sends, judge whether the heartbeat signal that carries in this first message is identical with the last heartbeat signal that carries from the second message that master clock receives, if different in the heartbeat signal in the first message and the second message that receives before, illustrate that this first message is sent out by master clock, good for use; If identical in the heartbeat signal in the first message and the second message that receives before illustrates that the non-master clock of this first message sends out, and be extremely unavailable, determine to have occurred in network tracking loop.Like this, the downstream synchronizer just can be pinpointed the problems in clock tracing Cheng Huan, thereby can fast and accurately determine clock tracing Cheng Huan.
The method of definite clock tracking ring formation that further embodiment of this invention provides, its network scenarios suppose that equipment 4 is for having the synchronizer of master clock as shown in Figure 2.
in normal situation, equipment 4 sends in the process of Announce (announcement) message at the interval, the variation of a reserve bytes by message is broadcast to all synchronizers to the heartbeat signal of master clock, all downstream synchronizers are being received master clock---after the message that contains heartbeat signal of equipment 4, extract the byte of this indication master clock heartbeat signal, compare with the heartbeat signal byte in the message that receives before, if different, illustrate that this message is the normal message that the equipment 4 at master clock place sends, thereby set up take equipment 4 as following the tracks of the tracking tree of source point.
At this, utilize a byte in message to carry the heartbeat signal of this master clock, it is minimum can making expense.
In the time of equipment 4 degradation, as can be seen from Figure 2, equipment 6 is more farther apart from equipment 4 than equipment 8, perhaps other network reason, and what equipment 6 obtained the master clock information updating wants slow, and the message of the transmission of equipment 6 is probably or the messages before equipment 4 degradations.But can initiatively not send again the message before degradation on equipment 4, so the message before should degradation can be again by old master clock---equipment 4 produces heartbeat signals.Like this, the old message of equipment 6 transmissions does not just have heartbeat to change yet.After equipment 8 was received the message that equipment 6 sends, the heartbeat signal that continuous monitoring is carried in the message did not change, and namely the heartbeat signal with the message that receives before is identical, and just determining this message is exception message, and abandons this message.Thereby intercepted wrong generation on initial key point.
In addition, during heartbeat signal that upstream device carries, if determine that message is normal message, just carry out clock tracing according to this message in receiving and judging message; If determine that this message is exception message, after abandoning this message, the time-out count device is added 1, when the time-out count device is not overtime, continue to receive the message of monitoring and judging the master clock transmission.So, the present embodiment also has stronger fault-tolerance, if upstream equipment is not change due to heartbeat signal that self reason causes, as long as the time surpasses the time of overtime judgement, can not cause that the agreement of upstream device is switched.
Concrete, as shown in Figure 3, comprise the following steps:
The new message (the first message) that master clock in S301, synchronizer monitoring network sends, and execution in step S 302.
S302, judge whether to receive new message (the first message).If do not receive new message (the first message), execution in step S301; If receive new message (the first message), execution in step S303.
The heartbeat signal that carries in S303, this new message of record (the first message), and execution in step S304.
Whether the heartbeat message heartbeat signal in S304, this new message of judgement (the first message) is identical with last heartbeat message heartbeat signal from the message (the second message) that master clock receives before.If difference, execution in step S305; If identical, execution in step S308.
S305, this new message (the first message) is carried out other detections.If detect successfully, execution in step S306; If detect unsuccessfully, execution in step S308.
S306, with the zero clearing of time-out count device, and execution in step S307.
S307, preserve this new message, and execution in step S301 again.
S308, the time-out count device is added 1, and execution in step S309.
S309, judge whether the time-out count device is overtime.If not overtime, execution in step S301; If overtime, execution in step S310.
S310, report overtimely, determine clock tracking ring formation, and execution in step S301 again.
The method of definite clock tracking ring formation that the embodiment of the present invention provides, synchronizer receives the first message that carries this master clock heartbeat signal that the master clock in network sends, judge whether the heartbeat signal that carries in this first message is identical with the last heartbeat signal that carries from the second message that master clock receives, if different in the heartbeat signal in the first message and the second message that receives before, illustrate that this first message is sent out by master clock, good for use; If identical in the heartbeat signal in the first message and the second message that receives before illustrates that the non-master clock of this first message sends out, and be extremely unavailable, determine to have occurred in network tracking loop.Like this, the downstream synchronizer just can be pinpointed the problems in clock tracing Cheng Huan, thereby can fast and accurately determine clock tracing Cheng Huan.
The synchronizer 40 that the embodiment of the present invention provides as shown in Figure 4, comprising:
Receiving element 401 is for first message that carries this master clock heartbeat signal of the master clock transmission that receives network.
Judging unit 402 is for judge whether the heartbeat signal that this first message carries is identical with the last heartbeat signal that carries from the second message that master clock receives; If the heartbeat signal that carries in the first message is different from the last heartbeat signal that carries, determine that clock tracing Cheng Huan does not occur this network, and the first message is normal from the second message that master clock receives; If the heartbeat signal that carries in the first message is identical with the last heartbeat signal that carries, determine this network generation clock tracing Cheng Huan, and the first message is abnormal from the second message that master clock receives.
The synchronizer that the embodiment of the present invention provides, synchronizer receives the first message that carries this master clock heartbeat signal that the master clock in network sends, and judges whether the heartbeat signal that carries in this first message is identical with the last heartbeat signal that carries from the second message that master clock receives; If different in the heartbeat signal in the first message and the second message that receives before illustrate that this first message is sent out by master clock, and are good for use; If identical in the heartbeat signal in the first message and the second message that receives before illustrates that the non-master clock of this first message sends out, and be extremely unavailable, determine to have occurred in network tracking loop.Like this, the downstream synchronizer just can be pinpointed the problems in clock tracing Cheng Huan, thereby can fast and accurately determine clock tracing Cheng Huan.
Further, as shown in Figure 5, this synchronizer 40 also comprises:
Clock tracing unit 403 is used for when definite the first message when normal, and first message normal according to this carries out clock tracing.
Time-out count unit 404 is used for when determining that the first message when abnormal, abandon this first abnormal message, and accumulates the time-out count device.
Overtime judging unit 405 is used for continuing to receive and judge the first message that master clock sends when the counter of time-out count unit 704 accumulations is not overtime; After the time-out count device is overtime, determine this network generation clock tracing Cheng Huan.
Thus, this this synchronizer 40 has stronger fault-tolerance, if upstream equipment is not change due to heartbeat byte that self reason causes, as long as the time surpasses the time of overtime judgement, can not cause that the agreement of upstream device is switched.
The clock tracing system that the embodiment of the present invention provides as shown in Figure 6, comprises master clock 602 and synchronizer 601, wherein:
Synchronizer 601 is for first message that carries these master clock 602 heartbeat signals of master clock 602 transmissions that receive network; Judge whether the heartbeat signal that carries in this first message is identical with the last heartbeat signal that carries from the second message that master clock 602 receives; If the heartbeat signal that carries in the first message is different from the last heartbeat signal that carries, determine that clock tracing Cheng Huan does not occur this network, and the first message is normal from the second message that master clock 602 receives; If the heartbeat signal that carries in the first message is identical with the last heartbeat signal that carries, determine this network generation clock tracing Cheng Huan, and the first message is abnormal from the second message that master clock 602 receives.
The clock tracing system that the embodiment of the present invention provides, synchronizer receives the first message that carries this master clock heartbeat signal that the master clock in network sends, and judges whether the heartbeat signal that carries in this first message is identical with the last heartbeat signal that carries from the second message that master clock receives; If different in the heartbeat signal in the first message and the second message that receives before illustrate that this first message is sent out by master clock, and are good for use; If identical in the heartbeat signal in the first message and the second message that receives before illustrates that the non-master clock of this first message sends out, and be extremely unavailable, determine to have occurred in network tracking loop.Like this, the downstream synchronizer just can be pinpointed the problems in clock tracing Cheng Huan, thereby can fast and accurately determine clock tracing Cheng Huan.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be completed by the hardware that program command is correlated with, aforesaid program can be stored in a computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection range with claim.
Claims (8)
1. the method for a definite clock tracking ring formation, is characterized in that, comprising:
Receive the first message that carries this master clock heartbeat signal that the master clock in network sends;
Judge whether the heartbeat signal that carries in described the first message is identical with the last heartbeat signal that carries from the second message that described master clock receives;
If the heartbeat signal that carries in described the first message is different from the last heartbeat signal that carries, determine that clock tracing Cheng Huan does not occur described network, and described the first message is normal from the second message that described master clock receives;
If the heartbeat signal that carries in described the first message is identical with the last heartbeat signal that carries, determine described network generation clock tracing Cheng Huan, and described the first message is abnormal from the second message that described master clock receives.
2. method according to claim 1, is characterized in that, utilizes a byte in message to carry the heartbeat signal of described master clock.
3. method according to claim 1, is characterized in that, described method also comprises:
When determining described the first message when normal, first message normal according to this carries out clock tracing.
4. method according to claim 1, is characterized in that, described method also comprises:
When determining that described the first message when abnormal, abandons this first abnormal message, accumulation time-out count device when described time-out count device is not overtime, continues to receive and judge the first message of described master clock transmission; After described time-out count device is overtime, determine described network generation clock tracing Cheng Huan.
5. a synchronizer, is characterized in that, comprising:
Receiving element is for first message that carries this master clock heartbeat signal of the master clock transmission that receives network;
Judging unit is for judge whether the heartbeat signal that described the first message carries is identical with the last heartbeat signal that carries from the second message that described master clock receives; If the heartbeat signal that carries in described the first message is different from the last heartbeat signal that carries, determine that clock tracing Cheng Huan does not occur described network, and described the first message is normal from the second message that described master clock receives; If the heartbeat signal that carries in described the first message is identical with the last heartbeat signal that carries, determine described network generation clock tracing Cheng Huan, and described the first message is abnormal from the second message that described master clock receives.
6. synchronizer according to claim 5, is characterized in that, described synchronizer also comprises:
The clock tracing unit is used for when definite described the first message when normal, and first message normal according to this carries out clock tracing.
7. synchronizer according to claim 5, is characterized in that, described synchronizer also comprises:
The time-out count unit is used for when determining that described the first message when abnormal, abandon this first abnormal message, and accumulates the time-out count device;
Overtime judging unit is used for continuing to receive and judge the first message that described master clock sends when the time-out count device of described time-out count unit accumulation is not overtime; After described time-out count device is overtime, determine described network generation clock tracing Cheng Huan.
8. a clock tracing system, is characterized in that, comprises master clock and synchronizer, wherein:
Described synchronizer comprises receiving element and judging unit,
Described receiving element is for first message that carries this master clock heartbeat signal of the described master clock transmission that receives network;
Described judging unit is for judge whether the heartbeat signal that described the first message carries is identical with the last heartbeat signal that carries from the second message that described master clock receives; If the heartbeat signal that carries in described the first message is different from the last heartbeat signal that carries, determine that clock tracing Cheng Huan does not occur described network, and described the first message is normal from the second message that described master clock receives; If the heartbeat signal that carries in described the first message is identical with the last heartbeat signal that carries, determine described network generation clock tracing Cheng Huan, and described the first message is abnormal from the second message that described master clock receives.
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| CN104796272B (en) * | 2014-01-16 | 2018-11-23 | 中国移动通信集团广东有限公司 | The monitoring method and device of network clocking |
| CN106549787B (en) * | 2015-09-21 | 2020-09-25 | 中兴通讯股份有限公司 | Clock planning method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4947382A (en) * | 1989-04-11 | 1990-08-07 | Vista Labs, Inc. | Direct digital locked loop |
| WO2002080012A1 (en) * | 2001-03-30 | 2002-10-10 | Itran Communications Ltd. | Distributed synchronization mechanism for shared communications media based networks |
| CN101170373A (en) * | 2007-11-27 | 2008-04-30 | 上海自动化仪表股份有限公司 | Clock synchronization realization method for loop network |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4947382A (en) * | 1989-04-11 | 1990-08-07 | Vista Labs, Inc. | Direct digital locked loop |
| WO2002080012A1 (en) * | 2001-03-30 | 2002-10-10 | Itran Communications Ltd. | Distributed synchronization mechanism for shared communications media based networks |
| CN101170373A (en) * | 2007-11-27 | 2008-04-30 | 上海自动化仪表股份有限公司 | Clock synchronization realization method for loop network |
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