CN103051439B - A kind of method and device of selection clock source - Google Patents
A kind of method and device of selection clock source Download PDFInfo
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- CN103051439B CN103051439B CN201110311373.7A CN201110311373A CN103051439B CN 103051439 B CN103051439 B CN 103051439B CN 201110311373 A CN201110311373 A CN 201110311373A CN 103051439 B CN103051439 B CN 103051439B
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- ptp messages
- hop count
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- ptp
- clock source
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a kind of method and device of selection clock source, including：Precision Time Protocol (PTP) message that clock equipment is sent is received from clockwork, after the PTP messages are received, the hop count that the PTP messages pass through is obtained, clock source is selected from the clock equipment according to the hop count that the PTP messages pass through.The present invention is when PTP messages pass through IP and/or MPLS network carries out Frequency Synchronization, by the ttl value for analyzing message, Slave clockworks are made to result in the hop count of message process, using hop count as BMC algorithms a reference factor, Slave clockworks are enable more optimally to select clock source and synchronize, so as to improve the net synchronization capability and synchronization accuracy of Slave clockworks.
Description
Technical field
The present invention relates to Clock Synchronization Technology field, more particularly to a kind of method and device of selection clock source.
Background technology
With the high speed development of 3G (third generation mobile technology) network, 1588 time synchronization protocols are in communication network
Obtain paying attention to and widely applying more and more.More operators carry out time synchronized using 1588 agreements, progressively replace
Change and carry out time synchronized using GPS (global positioning system).
G.8265.1 standard is defined in packet network ITU-T, realizes that PTP (assist by precise time using mode of unicast
View) Frequency Synchronization mode, define BMC (Alternate Best Master Clock, candidate's best master clock) algorithm choosing
Select needs to consider three factors in clock source, the selection flow of clock source：(1) clock grade (Quality Level, QL)；(2)
Priority (Priority)；(3) packet timing signal failure (Packet Timing Signal Fail, PTSF).
BMC algorithms consider clock grade QL, in the case of clock grade QL identicals, examined first when selecting clock source
Priority P riority is considered, in the case of clock grade QL and priority P riority all identicals, it is considered to PTSF.
It is grouped timing signal failure PTSF, including PTSF-lossSync (sync message loss), PTSF-
LossAnnounce (notification packet loss) and PTSF-unusable (unavailable)；Standard is provided, as generation PTSF-
During lossSync or PTSF-lossAnnounce signals, Slave clockworks must reselect clock source, PTSF-
LossSync and PTSF-lossAnnounce are, as measurement index, difference to can be achieved by comparing numerical value with numerical value
PTSF-lossSync and PTSF-lossAnnounce comparison between Maste (master) clockwork, for example, for PTSF-
LossSync uses the quantity that sync message is lost as the index of measurement, when the quantity that sync message is lost is more than designated value
When, PTSF-lossSync signals are produced, and it is current, and PTSF-unusable does not have a mensurable index, therefore,
Slave clockworks are when selecting clock source, in clock grade, priority, PTSF-lossSync and PTSF-
In the case of lossAnnounce all sames, it is impossible to complete the selection of clock source.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of method and device of selection clock source, clock source can be optimized
Selection, improve clock net synchronization capability.
In order to solve the above technical problems, a kind of method of selection clock source of the present invention, including：
Precision Time Protocol (PTP) message that clock equipment is sent is received from clockwork, the PTP reports are being received
Wen Hou, obtains the hop count that the PTP messages pass through, is selected according to the hop count that the PTP messages pass through from the clock equipment
Select clock source.
Further, in addition to：
It is described from clockwork after the PTP messages of clock source transmission are received, the hop count that the PTP messages are passed through with it is pre-
The hop count threshold value first configured is compared, and the hop count that the PTP messages sent in the clock source pass through is more than the hop count threshold value
When, PTSF-unusable (packet timing signal failure-unavailable) signal is produced, and perform described according to PTP messages warp
The hop count crossed selects clock source from the clock equipment.
Further, the hop count passed through according to the PTP messages selects clock source from the clock equipment, including：
It is described that from clockwork, to the clock grade of the clock equipment, priority, PTSF-lossSync, (packet is fixed
When Signal Fail-sync message lose) and PTSF-lossAnnounce (packet timing signal failure-notification packet loss) according to
It is secondary to be compared, in the clock grade, priority, PTSF-lossSync and PTSF-lossAnnounce all sames, choosing
Select by the minimum corresponding clock equipment of PTP messages of hop count as clock source.
Further, in addition to：
The clock equipment is sent after PTP messages to described from clockwork, the clock equipment with from clock
The equipment of the PTP messages is forwarded to add up hop count to the PTP messages between equipment, and by hop count record in the PTP
In message.
Further, the clock equipment is that the PTP messages configure fixed initial life span (TTL) value；
The equipment of the PTP messages is forwarded to add up hop count to the PTP messages, and by hop count record in the PTP
In message, including：After the PTP messages are received, the ttl value of the PTP messages is modified.
Further, the hop count that the PTP messages pass through is obtained, including：
The ttl value for obtaining the PTP messages from the PTP messages from clockwork, by the first of the PTP messages
Beginning ttl value subtracts the ttl value got from the PTP messages, obtains the hop count that the PTP messages pass through.
Further, a kind of device of selection clock source, including：Message receiving unit, hop count acquiring unit and clock source
Selecting unit, wherein：
The message receiving unit, for receiving Precision Time Protocol (PTP) message from clock equipment；
The hop count acquiring unit, for after the message receiving unit receives PTP messages, obtaining the PTP reports
The hop count that text passes through；
The clock source selection unit, the hop count for being passed through according to the PTP messages is selected from the clock equipment
Select clock source.
Further, the clock source selection unit, is additionally operable to receive clock source transmission in the message receiving unit
PTP messages after, the hop count and the hop count threshold value that is pre-configured with that the PTP messages are passed through are compared, and are sent out in the clock source
When the hop count that the PTP messages sent pass through is more than the hop count threshold value, and generation PTSF-unusable (failure of packet timing signal-no
Can use) signal, and perform it is described according to the PTP messages pass through hop count select clock source from the clock equipment.
Further, the clock source selection unit specifically for the clock grade of the clock equipment, priority,
PTSF-lossSync (packet timing signal failure-sync message is lost) and PTSF-lossAnnounce (packet timing signals
Failure-notification packet is lost) it is compared successively, in the clock grade, priority, PTSF-lossSync and PTSF-
During lossAnnounce all sames, the corresponding clock equipment of PTP messages for selecting the hop count passed through minimum is used as clock source.
Further, the hop count acquiring unit from the PTP messages specifically for obtaining the existence of the PTP messages
Time (TTL) value, the initial TTL value of the PTP messages is subtracted the ttl value got from the PTP messages, obtains described
The hop count that PTP messages pass through.
In summary, the present invention is reported when PTP messages pass through IP and/or MPLS network carries out Frequency Synchronization by analyzing
Text ttl value, make Slave clockworks result in message process hop count, using hop count as one of BMC algorithms refer to because
Element, enables Slave clockworks more optimally to select clock source and synchronize, so as to improve the same of Slave clockworks
Walk performance and synchronization accuracy.
Brief description of the drawings
Fig. 1 is the topological schematic diagram of packet network frequency protection in the prior art；
Fig. 2 is the flow chart of the method for the selection clock source of embodiment of the present invention；
The schematic diagram that PTP message forwardings and TTL of the Fig. 3 for present invention application example are handled；
Fig. 4 is the Organization Chart of the device of the selection clock source of embodiment of the present invention.
Embodiment
PTP frequencies are realized passing through the three-layer network such as IP (Internet protocol) and/or MPLS (multiprotocol label switching) network
When rate is synchronous, with the increase of hop count, PDV (Packet Delay Variation, change in packet delay variance) noise increases therewith；
Also, delay asymmetry increases also with the increase of hop count caused by background traffic change；Furthermore, it is contemplated that Frequency Synchronization
Performance, existing standard defines the maximum hop count that synchronous chain passes through.
Therefore, in present embodiment, when PTP signaling messages pass through three-layer network, when Slave (from) clockwork is found
When the hop count of PTP signaling messages exceedes hop count threshold value, produce PTSF-unusable signals notification device itself and carry out clock source
Switching, using hop count as PTSF-unusable measurement index, also, when selecting clock source, in clock grade QL and preferential
In the case of the level condition identical such as Priority, the factor of the hop count that PTP messages are passed through alternatively, selection hop count is minimum
The corresponding Master clockworks of PTP messages are used as clock source.
In present embodiment in PTP message repeating process, turn between Maste clockworks and Slave clockworks
The equipment of hair PTP messages adds up the hop count that PTP messages pass through, and such as Maste clockworks are that PTP messages configure the initial of fixation
TTL (Time To Live, life span) value, forwards the equipment of PTP messages to change TTL value according to the requirement of procotol,
Slave clockworks subtract the initial TTL value of PTP messages from the ttl value in PTP messages, obtain the jump of PTP messages process
Number, when selecting clock source, the hop count factor that alternatively clock source is referred to that PTP messages are passed through, so as to optimize clock source
Selection, improves synchronizing quality.The initial TTL value of PTP messages can be sent to Slave clockworks by Maste clockworks,
It can be pre-configured in Slave clockworks.
As shown in figure 1, according to packet timing architecture G.8265, Slave clockworks can be with two or more
Master clockworks set up between synchronized relation, also, Master clockworks and Slave clockworks and pass through unicast side
Formula, which is set up, to communicate, progress parameter negotiation, in present embodiment when PTP messages pass through three-layer network and realize Frequency Synchronization, is based on
The method that hop count realizes more excellent selection clock source, including：
Step 201：Master clockworks send PTP messages to Slave clockworks；
Step 202：PTP messages are forwarded in three-layer network, are turned between Master clockworks and Slave clockworks
The equipment for sending out PTP messages adds up the hop count that PTP messages pass through in repeating process, and by hop count record in PTP messages；
When PTP messages are directly encapsulated as IP or MPLS forms, often jumped by one, forwarding unit can be to the TTL of PTP messages
Value subtracts 1.
When three-layer network carries PTP messages as a tunnel, it can be mapped in the entrance and exit configuration TTL in tunnel
Rule, realizes the ttl value that PTP messages are changed in PTP message repeating process, Slave clockworks is got PTP reports
The hop count that text passes through.TTL mapping rulers may be referred to ietf standard RFC3443.
Step 203：Slave clockworks obtain the ttl value in message, obtained according to ttl value after PTP messages are received
To PTP messages pass through hop count, by hop count alternatively clock source condition carry out clock source selection.
Master clockworks are that PTP messages configure fixed initial TTL value (such as 255), and Slave clockworks are being received
To after PTP messages, obtain PTP messages in ttl value, by the initial TTL value of PTP messages subtract from PTP Receive messages to TTL
Value, obtains the hop count of PTP messages process.The initial TTL value of PTP messages can be sent to Slave clocks by Maste clockworks
Equipment, can also be pre-configured in Slave clockworks.
Slave clockworks carry out clock source selection when, to the clock grade of Maste clockworks, priority,
PTSF-lossSync and PTSF-lossAnnounce are compared successively, in clock grade, priority, PTSF-lossSync
In the case of PTSF-lossAnnounce all sames, the minimum corresponding Maste clockworks of PTP messages of selection hop count are made
For clock source.
In addition, Slave clockworks are to find the hop count of the PTP messages process of clock source transmission more than hop count threshold value
When (e.g., 31), PTSF-unusable signals are produced, and trigger the selection for carrying out clock source.
Using example：
As shown in figure 3, the method to present embodiment so that PTP messages pass through IP device and MPLS network as an example is carried out below
Illustrate, wherein, the three-layer equipment of MPLS network supports three-layer routing agreement, and sets up three layers of forward-path, and PTP messages use IP
Or MPLS encapsulation, and mode of unicast is used, the method for present embodiment includes：
Step a：Set up between Master clockworks and Slave clockworks and communicate and carry out parameter negotiation；
Step b：Master clockworks send PTP messages to Slave clockworks；
Step c：Forward the equipment of PTP messages to add up the hop count that PTP messages pass through in repeating process, and hop count is recorded
In PTP messages；
When PTP messages are directly encapsulated as IP or MPLS forms, often jumped by one, forwarding unit can be to the TTL of PTP messages
Value subtracts 1.
When three-layer network carries PTP messages as a tunnel, the entrance and exit configuration TTL mapping rule in tunnel
Then, the ttl value that PTP messages are changed in PTP message repeating process is realized.
Step d：Slave clockworks receive PTP messages, obtain the ttl value in message, are obtained according to the ttl value of PTP messages
The hop count passed through to PTP messages, selects source condition to carry out clock source selection hop count as BMC algorithms.
Fig. 4 is the device of the selection clock source of present embodiment, including：Message receiving unit, hop count acquiring unit and when
Clock source selecting unit, wherein：
Message receiving unit, for receiving PTP messages from clock equipment；
Hop count acquiring unit, for after message receiving unit receives PTP messages, obtaining the hop count that PTP messages pass through；
Hop count acquiring unit specifically for from PTP messages obtain PTP messages ttl value, by the initial TTL value of PTP messages subtract from
The ttl value got in PTP messages, obtains the hop count of PTP messages process.
Clock source selection unit, the hop count for being passed through according to PTP messages selects clock source from clock equipment；Clock
Source selecting unit is specifically for the clock grade of clock equipment, priority, PTSF-lossSync and PTSF-
LossAnnounce is compared successively, equal in clock grade, priority, PTSF-lossSync and PTSF-lossAnnounce
When identical, the corresponding clock equipment of PTP messages for selecting the hop count passed through minimum is used as clock source.
Clock source selection unit is additionally operable to after the PTP messages that message receiving unit receives clock source transmission, by the PTP
The hop count that message passes through is compared with the hop count threshold value being pre-configured with, and the hop count that the PTP messages sent in clock source pass through is big
When hop count threshold value, PTSF-unusable signals are produced, and perform the hop count passed through according to PTP messages from clock equipment
Select clock source.
It is described above, it is only the present invention preferably embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (8)
1. a kind of method for selecting clock source, it is characterised in that including：
The Precision Time Protocol PTP messages that clock equipment is sent are received from clockwork, after the PTP messages are received,
The hop count that the PTP messages pass through is obtained, clock is selected from the clock equipment according to the hop count that the PTP messages pass through
Source；PTP messages pass through Internet protocol and/or multi-protocol label switching network；
Wherein, the hop count passed through according to the PTP messages selects clock source from the clock equipment, including：
It is described from clockwork to the clock grade of the clock equipment, priority, packet timing signal failure-sync message
Lose PTSF-lossSync and packet timing signal failure-notification packet is lost PTSF-lossAnnounce and compared successively
Compared with, in the clock grade, priority, PTSF-lossSync and PTSF-lossAnnounce all sames, what selection was passed through
The minimum corresponding clock equipment of PTP messages of hop count is used as clock source.
2. the method as described in claim 1, it is characterised in that also include：
It is described from clockwork receive clock source transmission PTP messages after, by the PTP messages pass through hop count with matching somebody with somebody in advance
The hop count threshold value put is compared, when the hop count that the PTP messages that the clock source is sent pass through is more than the hop count threshold value, production
Estranged group of timing signal failure-unavailable PTSF-unusable signal, and perform the jump passed through according to the PTP messages
Number selects clock source from the clock equipment.
3. the method as described in claim 1, it is characterised in that also include：
The clock equipment is sent after PTP messages to described from clockwork, the clock equipment with from clockwork
Between forward the equipment of the PTP messages to add up hop count to the PTP messages, and by hop count record in the PTP messages
In.
4. method as claimed in claim 3, it is characterised in that：
The clock equipment is that the PTP messages configure fixed initial life span ttl value；
The equipment of the PTP messages is forwarded to add up hop count to the PTP messages, and by hop count record in the PTP messages
In, including：After the PTP messages are received, the ttl value of the PTP messages is modified.
5. method as claimed in claim 4, it is characterised in that obtain the hop count that the PTP messages pass through, including：
The ttl value for obtaining the PTP messages from the PTP messages from clockwork, by the initial of the PTP messages
Ttl value subtracts the ttl value got from the PTP messages, obtains the hop count that the PTP messages pass through.
6. a kind of device of selection clock source, it is characterised in that including：Message receiving unit, hop count acquiring unit and clock source
Selecting unit, wherein：
The message receiving unit, for receiving Precision Time Protocol PTP messages from clock equipment；PTP messages pass through interconnection
FidonetFido and/or multi-protocol label switching network；
The hop count acquiring unit, for after the message receiving unit receives PTP messages, obtaining the PTP messages warp
The hop count crossed；
The clock source selection unit, when the hop count for being passed through according to the PTP messages is selected from the clock equipment
Zhong Yuan；
Wherein, the clock source selection unit is specifically for the clock grade of the clock equipment, priority, packet timing
Signal Fail-sync message loses PTSF-lossSync and packet timing signal failure-notification packet loses PTSF-
LossAnnounce is compared successively, in the clock grade, priority, PTSF-lossSync and PTSF-
During lossAnnounce all sames, the corresponding clock equipment of PTP messages for selecting the hop count passed through minimum is used as clock source.
7. device as claimed in claim 6, it is characterised in that：
The clock source selection unit, is additionally operable to after the PTP messages that the message receiving unit receives clock source transmission, will
The hop count that the PTP messages pass through is compared with the hop count threshold value being pre-configured with, and the PTP messages sent in the clock source pass through
Hop count when being more than the hop count threshold value, produce packet timing signal failure-unavailable signal PTSF-unusable, and perform
The hop count passed through according to the PTP messages selects clock source from the clock equipment.
8. device as claimed in claim 6, it is characterised in that：
The hop count acquiring unit, will specifically for obtaining the life span ttl values of the PTP messages from the PTP messages
The initial TTL value of the PTP messages subtracts the ttl value got from the PTP messages, obtains what the PTP messages passed through
Hop count.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110311373.7A CN103051439B (en) | 2011-10-14 | 2011-10-14 | A kind of method and device of selection clock source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110311373.7A CN103051439B (en) | 2011-10-14 | 2011-10-14 | A kind of method and device of selection clock source |
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| CN103051439A CN103051439A (en) | 2013-04-17 |
| CN103051439B true CN103051439B (en) | 2017-10-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021184016A1 (en) * | 2020-03-13 | 2021-09-16 | Arris Enterprises Llc | Packet timing system with improved hop count |
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| FR3055985B1 (en) * | 2016-09-15 | 2018-10-05 | Alstom Transp Tech | METHOD OF SYNCHRONIZING A SYSTEM USING A VALIDITY TIME FOR EACH OUTPUT SIGNAL |
| CN106685566B (en) * | 2016-12-31 | 2018-10-02 | 上海东土远景工业科技有限公司 | A kind of selection method and clock server of clock source |
| ES2984932T3 (en) | 2018-09-13 | 2024-10-31 | Huawei Tech Co Ltd | Apparatus and method for decoder-side conditional motion vector refinement in video coding |
| CN109347589B (en) * | 2018-10-15 | 2021-11-09 | 中国移动通信有限公司研究院 | Data transmission method and network node |
| CN111385050B (en) * | 2018-12-29 | 2022-11-08 | 华为技术有限公司 | Clock synchronization method, device and storage medium |
| CN111385051B (en) * | 2018-12-29 | 2022-11-08 | 华为技术有限公司 | Clock synchronization method, device and storage medium |
| CN114448548B (en) | 2019-09-06 | 2024-11-15 | 华为技术有限公司 | Method, device, system and storage medium for implementing clock source selection |
| CN115664571B (en) * | 2022-09-06 | 2025-09-02 | 联芸科技(杭州)股份有限公司 | Frequency synchronization method, device and system |
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| CN101159533A (en) * | 2007-11-06 | 2008-04-09 | 中兴通讯股份有限公司 | Clock chain circuit automatic protection method in packet transmission network |
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| CN101789874A (en) * | 2009-12-15 | 2010-07-28 | 福建星网锐捷网络有限公司 | Multicast tree switching realization method, device and routing equipment in PIM-SM |
| CN102195766A (en) * | 2010-03-01 | 2011-09-21 | 杭州华三通信技术有限公司 | Time synchronization method and clock device |
| CN102006135A (en) * | 2010-12-03 | 2011-04-06 | 北京华环电子股份有限公司 | Method and device for selecting synchronous clock source |
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| WO2021184016A1 (en) * | 2020-03-13 | 2021-09-16 | Arris Enterprises Llc | Packet timing system with improved hop count |
| US12041155B2 (en) | 2020-03-13 | 2024-07-16 | Arris Enterprises Llc | Packet timing system with improved hop count |
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