CN111342926A - Method for optimizing time synchronization of PTP (precision time protocol) in asymmetric network - Google Patents
Method for optimizing time synchronization of PTP (precision time protocol) in asymmetric network Download PDFInfo
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Abstract
The invention discloses a method for optimizing the time synchronization of a PTP (precision time protocol) in an asymmetric network, which comprises the steps that a first device and a second device determine the master-slave relationship through a PTP (precision time protocol) state machine and interact with each other, and the second device obtains four time stamps from t1 to t 4; the first equipment and the second equipment carry out master-slave relationship conversion and interaction, and the first equipment obtains four timestamps from t5 to t 8; and the first equipment and the second equipment perform master-slave relationship conversion again, the first equipment sends the four timestamps from t5 to t8 to the second equipment, the second equipment calculates the time deviation and the link time delay according to the eight timestamps from t1 to t8 and performs verification, and time synchronization is performed when the verification is passed. According to the invention, through improving the interactive flow of the PTP protocol, two times of master-slave relation conversion are completed in the time synchronization process, and the accuracy of time synchronization in the asymmetric network is further ensured.
Description
Technical Field
The invention relates to the technical field of network communication, in particular to a method and a device for optimizing time synchronization of PTP (precision time protocol) in an asymmetric network.
Background
In network communication, network Clock synchronization is required for normal operation of services, PTP (Precision time protocol) is commonly used for high-Precision time synchronization between devices, and follows IEEE1588 protocol, the most precise Clock is confirmed by a Best Master Clock (BMC) algorithm, and a hardware timestamp is used to complete second pulse synchronization.
PTP messages typically include Sync messages (synchronization messages), Follow Up messages (Follow messages), Delay req messages (Delay request messages), and Delay resp messages (Delay request response messages). When time synchronization is carried out, a master clock sends a Sync message to a slave clock and records a sending time stamp t1 of the message, if the Sync message is in a One-Step mode, the Sync message carries a sending time stamp t1, after the slave clock receives the Sync message, the Sync message sending time stamp t1 and the Sync message receiving time stamp t2 are recorded, if the Sync message is in a Two-Step mode, the master clock sends a Follow _ Up message after sending the Sync message, the Follow _ Up message carries a Sync message sending time stamp t1, and the slave clock obtains the Sync message sending time stamp t1 and records a Sync message receiving time stamp t2 through the Follow _ Up message; sending a Delay _ req message from the slave clock to the master clock and recording a Delay _ req message sending time stamp t 3; after receiving the Delay _ req message, the master clock sends a receiving timestamp t4 of the Delay _ req message to the slave clock through a Delay _ resp message, and at the moment, the slave clock obtains four timestamps of t 1-t 4. The time Offset and the link delays Tms and Tsm are further calculated by the following formula:
t1+Offset+Tms＝t2
t3-Offset+Tsm＝t4。
the existing PTP network time synchronization protocol is generally applied to a symmetric network, that is, link delays of round trips between links are the same, that is, Tms is Tsm, and a PTP protocol state machine can calculate link delays and time deviations through the above formula and perform time synchronization. However, in an asymmetric network, due to physical lines and other reasons, Tms and Tsm are often unequal, that is, link delay is unbalanced, and if the state machine operates according to the existing PTP protocol, synchronization time accuracy is finally affected, resulting in poor time synchronization.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an optimization method for the time synchronization of PTP in the asymmetric network, which can accurately obtain the time deviation and the link time delay in the asymmetric network and realize the precise time synchronization.
In order to achieve the purpose, the invention provides the following technical scheme: a method for optimizing the time synchronization of a PTP in an asymmetric network comprises the following steps:
s100, the first equipment and the second equipment determine a master-slave relationship through a PTP (precision time protocol) state machine and perform protocol time message interaction, and the second equipment obtains a synchronous message sending time stamp t1, a synchronous message receiving time stamp t2, a delay request message sending time stamp t3 and a delay request message receiving time stamp t 4;
s200, the first device and the second device perform master-slave relationship conversion and protocol time message interaction, and the first device obtains a synchronous message sending time stamp t5, a synchronous message receiving time stamp t6, a delay request message sending time stamp t7 and a delay request message receiving time stamp t 8:
s300, the first device and the second device perform master-slave relationship conversion again, the first device sends the synchronous message sending timestamp t5, the synchronous message receiving timestamp t6, the delay request message sending timestamp t7 and the delay request message receiving timestamp t8 to the second device, the second device calculates time deviation and link delay according to the synchronous message sending timestamps t1 and t5, the synchronous message receiving timestamps t2 and t6, the delay request message sending timestamps t3 and t7 and the delay request message receiving timestamps t4 and t8, verifies the time deviation and the link delay and performs time synchronization when the time deviation and the link delay pass the verification.
Preferably, in step S100, the performing, by the first device, protocol time packet interaction with the second device includes:
the first device sends a synchronous message to the second device and records a synchronous message sending time stamp t 1;
the second equipment receives the synchronous message, records a synchronous message receiving timestamp t2 and acquires a synchronous message sending timestamp t 1;
the second device sends a delay request message to the first device and records a delay request message sending time stamp t 3;
the first device receives the delay request message and transmits a delay request message reception timestamp t4 to the second device through a delay request response message.
Preferably, the second device obtains the sync message transmission time stamp t1 through the sync message in the single step mode or obtains the sync message transmission time stamp t1 through the follow message in the double step mode.
Preferably, in step S200, the second device performs master-slave relationship conversion by sending a PTP management message to the first device.
Preferably, in step S200, the performing, by the first device, protocol time packet interaction with the second device includes:
the second device sends a synchronous message to the first device and records a synchronous message sending time stamp t 5;
the first equipment receives the synchronous message, records a synchronous message receiving timestamp t6 and acquires a synchronous message sending timestamp t 5;
the first equipment sends a delay request message to the second equipment and records a delay request message sending time stamp t 7;
the second device receives the delay request message and sends the delay request message receiving timestamp t7 to the first device through a delay request response message.
Preferably, the first device obtains the sync message transmission time stamp t5 through a sync message in the single step mode or obtains the sync message transmission time stamp t5 through a follow message in the double step mode.
Preferably, in step S300, the first device sends two PTP management messages to the second device, where one PTP management message is used for master-slave relationship conversion, and the other PTP management message is used to carry a synchronization message sending timestamp t5, a synchronization message receiving timestamp t6, a delay request message sending timestamp t7, and a delay request message receiving timestamp t 8.
Preferably, in step S300, the second device calculates the time offset and the link delay according to any three of the following formulas:
t1+Offset+Tms＝t2
t3-Offset+Tsm＝t4
t5+Offset+Tms＝t6
t7-Offset+Tsm＝t8
wherein Offset is a time Offset, Tms is a link delay from the first device to the second device, and Tsm is a link delay from the second device to the first device.
Preferably, in step S300, the verifying the time offset and the link delay includes the following steps:
and judging whether the difference value between the sum of the time deviation and the link delay in any one formula in the step S300 and the sum of the time deviation and the link delay calculated by the other three formulas is within a preset threshold range, if so, passing the verification, otherwise, failing to pass the verification.
Preferably, the preset threshold range is 0-1 ms.
The invention has the beneficial effects that:
according to the invention, by improving the protocol time message interaction process of the PTP protocol state machine, the conversion of the master-slave relationship is completed twice in the time synchronization process, namely, the role exchange of the time synchronization is completed twice, so that the accuracy of time synchronization in the asymmetric network is ensured.
Drawings
FIG. 1 is a flow chart illustration of the present invention;
FIG. 2 is a schematic diagram illustrating an interaction flow after a first device and a second device determine a master-slave relationship;
fig. 3 is a schematic view of an interaction flow after a first device and a second device convert a relationship for the first time.
Detailed Description
The technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.
The invention discloses an optimization method for time synchronization of PTP in an asymmetric network, which is characterized in that a protocol time message interaction flow of a PTP protocol state machine is improved, so that two time synchronization roles are exchanged in the time synchronization process, and the accuracy of time synchronization in the asymmetric network is further realized.
As shown in fig. 1, the method for optimizing time synchronization of PTP in an asymmetric network disclosed in the present invention includes the following steps:
s100, the first equipment and the second equipment determine a master-slave relationship through a PTP (precision time protocol) state machine and perform protocol time message interaction, and the second equipment obtains a synchronous message sending time stamp t1, a synchronous message receiving time stamp t2, a delay request message sending time stamp t3 and a delay request message receiving time stamp t 4;
specifically, the present invention is explained in detail by taking two devices (respectively referred to as a first device and a second device) as an example. The PTP protocol state machine is used to determine a master-slave relationship between devices and calculate a clock offset and a link delay in a time synchronization process, as shown in fig. 2, a first device and a second device determine the master-slave relationship through negotiation of the PTP protocol state machine, that is, the first device is a master clock device, the second device is a slave clock device, and when the master-slave relationship is determined, protocol time packet interaction is performed between the first device and the second device according to a delay request-response mechanism, where the protocol time packet interaction process is as follows:
the first equipment sends a synchronization message (Sync message) to the second equipment and records a synchronization message sending timestamp t 1;
judging whether the mode is a single Step mode (One Step), if so, carrying a synchronous message sending time stamp t1 by the synchronous message, otherwise, also being a double Step mode (Two Step), the first equipment sends a following message (Follow _ up message) carrying a synchronous message sending time stamp t1 to the second equipment after sending the synchronous message;
after receiving the synchronous message, the second device records a synchronous message receiving timestamp t2, and acquires a synchronous message sending timestamp t1 through the synchronous message in a single-step mode or acquires a synchronous message sending timestamp t1 through a following message in a double-step mode;
the second device sends a Delay request message (Delay _ req message) to the first device, and is used for initiating the calculation of reverse transmission Delay and recording a Delay request message sending timestamp t 3;
after receiving the delay request message, the first device sends a delay request message receiving timestamp t4 to the second device through a delay request response message;
through the above process, the second device obtains a sync message transmission timestamp t1, a sync message reception timestamp t2, a delay request message transmission timestamp t3, and a delay request message reception timestamp t 4.
S200, the first equipment and the second equipment perform master-slave relationship conversion and protocol time message interaction, and the first equipment obtains a synchronous message sending time stamp t5, a synchronous message receiving time stamp t6, a delay request message sending time stamp t7 and a delay request message receiving time stamp t 8;
specifically, after the first device and the second device perform the first protocol time packet interaction in step S100, the second device obtains a synchronization packet sending timestamp t1, a synchronization packet receiving timestamp t2, a delay request packet sending timestamp t3, and a delay request packet receiving timestamp t4, at this time, the second device performs master-slave relationship conversion by sending a PTP management packet to the first device, that is, the second device is a master clock device at this time, the first device is a slave clock device, and in implementation, the first device receives the PTP management packet and then uploads the PTP management packet to the CPU to complete the master-slave relationship conversion. As shown in fig. 3, after the first device and the second device perform master-slave relationship conversion, the second device performs protocol time packet interaction with the first device, where the protocol time packet interaction process is as follows:
the second equipment sends a synchronization message (Sync message) to the first equipment and records a synchronization message sending timestamp t 5;
judging whether the mode is a single Step mode (One Step), if so, carrying a synchronous message sending time stamp t5 by the synchronous message, otherwise, also being a double Step mode (Two Step), sending a following message (Follow _ up message) carrying a synchronous message sending time stamp t5 to the first equipment by the second equipment after sending the synchronous message;
after receiving the synchronous message, the first device records a synchronous message receiving timestamp t6, and acquires a synchronous message sending timestamp t5 through the synchronous message in a single-step mode or acquires a synchronous message sending timestamp t5 through a following message in a double-step mode;
the first equipment sends a Delay request message (Delay _ req message) to the second equipment, is used for initiating the calculation of reverse transmission Delay and records a Delay request message sending timestamp t 7;
after receiving the delay request message, the second device sends a delay request message receiving timestamp t8 to the first device through a delay request response message;
through the above process, the first device obtains a sync message transmission timestamp t5, a sync message reception timestamp t6, a delay request message transmission timestamp t7, and a delay request message reception timestamp t 8.
S300, the first device and the second device perform master-slave relationship conversion again, the first device sends the synchronous message sending timestamp t5, the synchronous message receiving timestamp t6, the delay request message sending timestamp t7 and the delay request message receiving timestamp t8 to the second device, the second device calculates time deviation and link delay according to the synchronous message sending timestamps t1 and t5, the synchronous message receiving timestamps t2 and t6, the delay request message sending timestamps t3 and t7 and the delay request message receiving timestamps t4 and t8, verifies the time deviation and the link delay, and performs time synchronization when the time deviation and the link delay pass the verification.
Specifically, after the first device and the second device perform the second protocol time packet interaction in step S200, the first device sends two PTP management packets to the second device, where one PTP management packet is used for switching between master and slave relationships, and the other PTP management packet is used to carry a synchronization packet sending timestamp t5, a synchronization packet receiving timestamp t6, a delay request packet sending timestamp t7, and a delay request packet receiving timestamp t 8. After receiving the two PTP management messages, the second device performs a master-slave relationship conversion, that is, the first device is a master clock device and the second device is a slave clock device, and on the other hand, the second device obtains a synchronization message transmission timestamp t5, a synchronization message reception timestamp t6, a delay request message transmission timestamp t7, and a delay request message reception timestamp t8 through the PTP management messages.
At this time, the second device obtains a sync message transmission timestamp t1, a sync message reception timestamp t2, a delay request message transmission timestamp t3, a delay request message reception timestamp t4, a sync message transmission timestamp t5, a sync message reception timestamp t6, a delay request message transmission timestamp t7, and a delay request message reception timestamp t 8. The time deviation and the link delay are further calculated according to the following formula:
t1+Offset+Tms＝t2 (1)
t3-Offset+Tsm＝t4 (2)
t5+Offset+Tms＝t6 (3)
t7-Offset+Tsm＝t8 (4)
wherein Offset is a time Offset, Tms is a link delay from the first device to the second device, and Tsm is a link delay from the second device to the first device. In practice, the time Offset, the link time delay Tms and the link time delay Tsm can be calculated by any three equations of the above equations (1) to (4).
Further, after the time Offset and the link delay are calculated, the time Offset and the link delay are further verified. The verification comprises the following steps: and judging whether the difference value between the sum of the time deviation and the link time delay in any one formula in the step S300 and the sum of the time deviation and the link time delay obtained by calculation of the other three formulas is within a preset range, if so, passing the verification, and otherwise, failing to pass the verification. Specifically, the second device may calculate the time Offset, the link delay Tms, and the link delay Tsm through any three formulas in the above formulas (1) to (4), and the remaining one formula may be used for verification, in this embodiment, the time Offset and the link delay are calculated through formulas (1) to (3), and verification is performed through formula (4):
calculating the time Offset, the link time delay Tms and the link time delay Tsm according to the formulas (1) to (3), and then further calculating the sum of the time Offset and the link time delay Tsm;
after the sum of the time Offset and the link time delay Tsm is calculated, the sum of the time Offset and the link time delay Tsm in the formula (4) is further calculated, and the difference between the time Offset and the link time delay Tsm is calculated;
and after calculating the difference value of the two, judging whether the difference value is within a preset threshold range, if so, passing the verification, otherwise, failing the verification, and when failing to pass the verification, repeating the steps S100-S300 until the difference value meets the preset threshold range.
In this embodiment, the preset threshold range is set to be 0-1 ms as the best, and certainly, the preset threshold range can be set according to actual requirements.
In the present invention, the time Offset, the link Delay Tms and the link Delay Tsm can be accurately obtained in the asymmetric network through the steps S100 to S300, so that the time can be accurately synchronized, and similarly, the time Offset, the link Delay Tms and the link Delay Tsm can also be accurately obtained for PDelay (Peer Delay Mechanism) specified in the PTP protocol by using the steps S100 to S300.
Therefore, the scope of the present invention should not be limited to the disclosure of the embodiments, but includes various alternatives and modifications without departing from the scope of the present invention, which is defined by the claims of the present patent application.
Claims (10)
1. A method for optimizing the time synchronization of a PTP in an asymmetric network is characterized by comprising the following steps:
s100, the first equipment and the second equipment determine a master-slave relationship through a PTP (precision time protocol) state machine and perform protocol time message interaction, and the second equipment obtains a synchronous message sending time stamp t1, a synchronous message receiving time stamp t2, a delay request message sending time stamp t3 and a delay request message receiving time stamp t 4;
s200, the first device and the second device perform master-slave relationship conversion and protocol time message interaction, and the first device obtains a synchronous message sending time stamp t5, a synchronous message receiving time stamp t6, a delay request message sending time stamp t7 and a delay request message receiving time stamp t 8:
s300, the first device and the second device perform master-slave relationship conversion again, the first device sends the synchronous message sending timestamp t5, the synchronous message receiving timestamp t6, the delay request message sending timestamp t7 and the delay request message receiving timestamp t8 to the second device, the second device calculates time deviation and link delay according to the synchronous message sending timestamps t1 and t5, the synchronous message receiving timestamps t2 and t6, the delay request message sending timestamps t3 and t7 and the delay request message receiving timestamps t4 and t8, verifies the time deviation and the link delay and performs time synchronization when the time deviation and the link delay pass the verification.
2. The method according to claim 1, wherein in step S100, the protocol time packet interaction between the first device and the second device includes:
the first device sends a synchronous message to the second device and records a synchronous message sending time stamp t 1;
the second equipment receives the synchronous message, records a synchronous message receiving timestamp t2 and acquires a synchronous message sending timestamp t 1;
the second device sends a delay request message to the first device and records a delay request message sending time stamp t 3;
the first device receives the delay request message and transmits a delay request message reception timestamp t4 to the second device through a delay request response message.
3. The method of claim 2, wherein the second device obtains the sync message transmission timestamp t1 through a sync message in single step mode or obtains the sync message transmission timestamp t1 through a follow message in double step mode.
4. The method according to claim 1, wherein in step S200, the second device performs the master-slave relationship conversion by sending a PTP management message to the first device.
5. The method according to claim 1, wherein in step S200, the protocol time packet interaction between the first device and the second device includes:
the second device sends a synchronous message to the first device and records a synchronous message sending time stamp t 5;
the first equipment receives the synchronous message, records a synchronous message receiving timestamp t6 and acquires a synchronous message sending timestamp t 5;
the first equipment sends a delay request message to the second equipment and records a delay request message sending time stamp t 7;
the second device receives the delay request message and sends the delay request message receiving timestamp t7 to the first device through a delay request response message.
6. The method of claim 5, wherein the first device obtains the sync message transmission timestamp t5 through a sync message in single step mode or obtains the sync message transmission timestamp t5 through a follow message in double step mode.
7. The method according to claim 1, wherein in step S300, the first device sends two PTP management messages to the second device, where one PTP management message is used for master-slave relationship conversion, and the other PTP management message is used to carry a synchronization message sending timestamp t5, a synchronization message receiving timestamp t6, a delay request message sending timestamp t7, and a delay request message receiving timestamp t 8.
8. The method according to claim 1, wherein in step S300, the second device calculates the time offset and the link delay according to any three of the following formulas:
t1+Offset+Tms＝t2
t3-Offset+Tsm＝t4
t5+Offset+Tms＝t6
t7-Offset+Tsm＝t8
wherein Offset is a time Offset, Tms is a link delay from the first device to the second device, and Tsm is a link delay from the second device to the first device.
9. The method of claim 8, wherein the step S300 of verifying the time offset and the link delay comprises the steps of:
and judging whether the difference value between the sum of the time deviation and the link delay in any one formula in the step S300 and the sum of the time deviation and the link delay calculated by the other three formulas is within a preset threshold range, if so, passing the verification, otherwise, failing to pass the verification.
10. The method according to claim 9, wherein the preset threshold is in a range of 0-1 ms.
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Address after: 215101 unit 13 / 16, 4th floor, building B, No. 5, Xinghan street, Suzhou Industrial Park, Jiangsu Province Applicant after: Suzhou Shengke Communication Co.,Ltd. Address before: Unit 13 / 16, 4th floor, building B, No.5 Xinghan street, Suzhou Industrial Park, 215000 Jiangsu Province Applicant before: CENTEC NETWORKS (SU ZHOU) Co.,Ltd. |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200626 |