CN110071777B - CurrentUtcOffset parameter self-adaptive processing method of PTP over PTN - Google Patents
CurrentUtcOffset parameter self-adaptive processing method of PTP over PTN Download PDFInfo
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Abstract
The invention discloses a currentUtcOffset parameter self-adaptive processing method of a PTP over PTN, wherein a PTN link based on the method comprises PTP equipment of at least two sets of GPS satellite systems which are mutually prepared, and the PTP equipment is a satellite PTP clock of the link; setting the priority of the mutually-prepared PTP clock, selecting a grandmaster in one of the acting links, automatically acquiring correct currentUtcOffset parameters, storing and broadcasting; the standby PTP equipment acquires broadcast data and stores the broadcast data as parameters of the standby PTP equipment; when the grandmaster is inactive, other alternate PTP devices may be switched. The parameters of the invention are automatically converted from the information acquired by the GPS or the Beidou, and the parameters of the standby PTP equipment are also automatically acquired without manual setting. The standby PTP equipment is specified, and illegal parameters cannot be applied to a PTP time transfer link.
Description
Technical Field
The invention belongs to the technical field of time synchronization, and particularly relates to a currentUtcOffset parameter self-adaptive processing method of a PTP over PTN.
Background
In a link for completing time synchronization through a PTN, a precision clock synchronization protocol IEEE1588 (hereinafter abbreviated as PTP) of a network measurement and control system includes various PTP devices such as an origin clock (grandmaster, master, slave), a Boundary clock, an End-to-End transfer clock, and a Peer-to-Peer transfer clock. Various devices play respective roles in the communication process, a currentutoffset parameter is used when the PTP time needs to be analyzed in a link, the parameter is an important parameter for converting PTP epoch into UTC time and is transmitted by an Announcemessage bearer, and the parameter is a dynamic parameter variable, and the change of the value is triggered by a leap second event.
Leap second events are uniformly issued by the international metering bureau, and the information can be forecasted by a GPS satellite system, a Beidou satellite system and time-frequency professional organizations of all countries.
According to the PTP protocol, only one grandmaster in the network (here, PTN network) is provided, and the time broadcast by the grandmaster and currentutcofset parameters are transmitted in the network to the last PTP node in a stepwise manner. In this way, the currentUtcOffset parameter broadcasted by the grandmaster is used when the link needs to be analyzed.
In the PTN vs. time link, the current grandmaster may not be able to function in the entire network due to line damage or device abnormality, and in this case, other PTP devices with grandmaster capability in the node may function as a grandmaster, and a currentutoffset parameter is broadcast by the new grandmaster. If the parameter configuration of currentUtcOffset of the two gradmasters before and after the two gradmasters are different, the UTC time analyzed after the two gradmasters are switched may be different.
At present, currentutoffset is mostly set in a manual mode, in order to ensure that the parameters of all PTP equipment in a PTN link are kept consistent, and the changed currentutoffset value can be correctly configured in time when leap second triggers, operation and maintenance are complex, and once working negligence can be solved after the grandmaster equipment is switched by a network, inconsistent UTC time before and after the grandmaster equipment is solved. The PTP protocol is designed for an application scene with time synchronization precision requirement on a sub-microsecond level, and the currentUtcOffset unit is a second level, so that the error of the parameter can cause the second level error of the analyzed UTC time, and the design target and the use requirement of the sub-microsecond level of the PTP protocol are seriously not met.
Disclosure of Invention
The invention aims to overcome the technical problems in the prior art, mainly aims at the current situation that currentUtcOffset is set manually, and provides a currentUtcOffset parameter self-adaptive processing method of PTP over PTN.
The invention adopts the following technical scheme: the PTP over PTN based on the method comprises at least two sets of mutually-prepared PTP equipment with Beidou or GPS satellite systems, wherein the PTP equipment is a satellite PTP clock of the PTN link;
the method comprises the following steps:
step one, respectively setting priorities for the mutually-prepared satellite PTP clocks, and selecting one of the mutually-prepared satellite PTP clocks to serve as a grandmaster in a PTN link through a BMC algorithm;
step two, the selected satellite PTP clock serving as the grandmaster in the PTN link automatically acquires correct currentUtcOffset through a Beidou satellite or a GPS satellite for storage, and broadcasts through the Announce message of a PTP protocol;
step three, other standby PTP equipment with the function of becoming a grandmaster in the PTN link acquires currentUtcOffset data broadcasted by a satellite PTP clock serving as the grandmaster in the PTN link, then judges the legality of the currentUtcOffset data and stores the currentUtcOffset data as own currentUtcOffset;
and step four, when the selected satellite PTP clock which is used for serving as the grandmaster in the PTN link is not functional, other standby PTP equipment which is used for serving as the grandmaster in the PTN link takes the role of the grandmaster.
Preferably, the standby PTP device that becomes the grandmaster in step four is a standby PTP device that is synchronized by the satellite PTP clock that originally serves as the grandmaster in the PTN link in step three and passes currentutoffset.
Preferably, the priorities in the step one are set to 0 and 1, respectively.
Preferably, the step two includes three sub-processes: an initialization sub-process, which is a sub-process for receiving the time difference between the satellite epoch and the UTC to form a currentUtcOffset sub-process and a currentUtcOffset broadcasting sub-process;
the initialization sub-process: the initialization time of the satellite PTP clock program is currentUtcOffsetInitFlag to be 0;
the time difference between the received satellite epoch and UTC forms a currentutoffset subprocess: receiving the time difference between a GPS epoch and a UTC broadcast by a GPS satellite or the time difference between a Beidou epoch and the UTC broadcast by a Beidou satellite; judging whether the time difference between the GPS epoch or the Beidou epoch and the UTC is received or not, if so, calculating the time difference between the GPS epoch or the Beidou epoch and the UTC, and pushing out the difference between the PTP epoch and the GPS epoch or the difference between the PTP epoch and the Beidou epoch according to the PTP epoch described in the PTP protocol, and finally calculating the time difference between the PTP epoch and the UTC; setting a local currentUtcOffset parameter as the time difference between the PTP epoch and UTC which are obtained by calculation, and setting currentUtcOffsetiInitFlag to 1;
the currentutoffset dissemination sub-process: firstly, judging whether the time is the Annunce message broadcasting time; if the Announce message time is broadcast, judging whether currentUtcOffsetiInitFlag is 1, if the Announce message time is 1, broadcasting Announce message, currentUtcOffset in the broadcasted Announcemessage fills currentUtcOffset of satellite calculation, and timestamp fills GPS (if the Beidou still fills GPS, because no Beidou definition exists in IEEE1588 protocol), otherwise, not broadcasting.
Preferably, the third step includes an initialization sub-process, a currentUtcOffset of the superior grandmaster is received, and a currentUtcOffset sub-process of the body equipment is automatically formed;
the initialization sub-process: setting currentUtcOffsetInitFlag to 0 when a standby PTP equipment program is initialized;
the currentutoffset of the upper grade grandmaster is received, and the currentutoffset subprocess of the body equipment is automatically formed: the standby PTP equipment system waits for receiving the Announce message; when receiving the Announce message, analyzing the currentUtcOffset and the value of the timeSource in the message; then, whether the analyzed timeSource is GPS is judged, if yes, currentUtcOffset parameter of the device is set to currentUtcOffset, and a satellite initialization completion flag currentUtcOffsetInitFlag is set to be 1.
Preferably, the specific process of step four is as follows: judging whether the time is the time for broadcasting the Annunce message; if the time is the time for broadcasting the Announcemessage, judging whether currentUtcOffsetInitFlag is 1, if the currentUtcOffsetInitFlag is 1, broadcasting the Announcemessage, otherwise, not broadcasting the Announcemessage; currentutoffset in the broadcast Announce message is filled in as currentutoffset value calculated according to the satellite, and timeSource is filled in as HAND _ SET.
The action principle of the invention is as follows: the converted currentutoffset is automatically obtained from a GPS or Beidou satellite and is transmitted to PTP equipment in the PTN link, and the currentutoffset with the grandmaster capability in the PTP equipment is inherited as a satellite PTP clock, and the parameter is broadcasted when the currentutoffset is used as the grandmaster of the link. The currentutcofset parameter of the PTP equipment on the PTN link network is set in a self-adaptive mode instead of a manual mode.
The invention has the following beneficial effects:
1) and the currentUtcOffset parameter transmitted by 1588 time is converted from the information acquired by GPS or Beidou automatically without manual setting.
2) In a link for transmitting the Announce message broadcasted by the satellite PTP clock to 1588 time of the PTP, all PTP equipment in the link can receive the currentUtcOffset, and other PTP equipment with the grandmaster capability in the link acquires the parameter for storage and uses the parameter as the value of currentUtcOffset broadcasted when the parameter becomes grandmaster, thereby solving the problem of automatic acquisition of currentUtcOffset of all PTP equipment with grandmaster capability in the whole PTN link.
3) Due to the fact that PTP equipment with the grandmaster capability is specified in the method, when currentUtcOffset initialized by a satellite is not obtained, the role of the grandmaster cannot be switched to, and illegal currentUtcOffset cannot be applied to a PTP time transfer link of the PTN.
Drawings
FIG. 1 is a general flow chart of a process for simulcasting a satellite PTP bell into currentUtcOffset;
FIG. 2 is an initialization sub-process of a process of satellite PTP belling to currentUtcOffset and broadcasting;
FIG. 3 is a sub-process of currentUtcOffset formation by the time difference between the received satellite epoch and UTC of the process of satellite PTP bell-shaped currentUtcOffset broadcast;
FIG. 4 is a currentUtcOffset dissemination sub-process of a flow of satellite PTP bells into currentUtcOffset and dissemination;
FIG. 5 is a flowchart of currentUtcOffset formation for a PTP device with grandmaster functionality;
FIG. 6 is an initialization sub-process of a flow of currentUtcOffset formation for a PTP device with grandmaster functionality;
fig. 7 is a currentutoffset subprocess of receiving currentutoffset of an upper level grandmaster and automatically forming a currentutoffset of a body device of a currentutoffset forming flow of a PTP device having a grandmaster function;
fig. 8 is a flowchart of the switching of the PTP device having the grandmaster function to the grandmaster.
Detailed Description
The present invention will be further described with reference to specific examples, which are illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 to 8, the PTN link based on the method includes at least two sets of mutually-prepared PTP devices with beidou or GPS satellite systems, where the PTP devices are satellite PTP clocks of the PTN link;
the method comprises the following steps:
step one, respectively setting priorities for the mutually-prepared satellite PTP clocks, and selecting one of the mutually-prepared satellite PTP clocks to serve as a grandmaster in a PTN link through a BMC algorithm;
step two, the selected satellite PTP clock serving as the grandmaster in the PTN link automatically acquires correct currentUtcOffset through a Beidou satellite or a GPS satellite for storage, and broadcasts through the Announce message of a PTP protocol;
step three, other standby PTP equipment with the function of becoming a grandmaster in the PTN link acquires currentUtcOffset data broadcasted by a satellite PTP clock serving as the grandmaster in the PTN link, then judges the legality of the currentUtcOffset data and stores the currentUtcOffset data as own currentUtcOffset;
and step four, when the selected satellite PTP clock which is used for serving as the grandmaster in the PTN link is not functional, other standby PTP equipment which is used for serving as the grandmaster in the PTN link takes the role of the grandmaster.
The standby PTP equipment which becomes the grandmaster in the fourth step is standby PTP equipment which is synchronized by the satellite PTP clock which originally serves as the grandmaster in the PTN link and passes currentUtcOffset in the third step.
The priority in the first step is set to 0 and 1 respectively.
Specifically, the flow charts of the program for bell-forming and broadcasting the satellite PTP into currentUtcOffset refer to fig. 1, fig. 2, fig. 3, and fig. 4; the process comprises three sub-processes: and initializing a subprocess, namely receiving the time difference between the satellite epoch and the UTC to form a currentUtcOffset subprocess and a currentUtcOffset broadcasting subprocess.
1) Initialization sub-process
The initialization time of the satellite PTP clock program is currentUtcOffsetInitFlag to be 0;
2) sub-process for forming currentutoffset by receiving time difference between satellite epoch and UTC
-receiving the time difference between the GPS epoch (beidou epoch) and the UTC broadcast by the GPS satellite (or beidou satellite);
if the time difference between the GPS epoch (Beidou epoch) and the UTC broadcast by the GPS satellite (or the Beidou satellite) is received, the time difference between the GPS epoch (Beidou epoch) and the UTC broadcast by the GPS satellite (or the Beidou satellite) is solved;
calculating the time difference between the PTP epoch and the UTC according to the PTP epoch deduction described in the PTP protocol and the difference between the PTP epoch and the GPS epoch (and the Beidou epoch difference);
-setting the local currentutoffset parameter as the time difference between the PTP epoch and UTC calculated;
-setting currentutputcofsetinitflag to 1;
3) CurrentUtcOffset broadcast sub-process
-determining whether it is the time of announcing the message;
if the Announcemessage time is broadcast, it is determined whether currentutputcofsetlnitflag is 1, if so, the Announcemessage is broadcast, currentutputcoffset in the broadcast Announcemessage fills currentutputcoffset of satellite solution, and time source fills GPS (if beidou is beidou, the beidou is still filled as GPS, because there is no beidou definition in IEEE1588 protocol), otherwise, the currentutputcoftinflag is not broadcast.
2. currentUtcOffset formation for a standby PTP device with grandmaster functionality see figures 5, 6, 7; the process comprises two sub-processes: initializing a subprocess, receiving currentUtcOffset of a superior grandmaster, and forming a currentUtcOffset subprocess of the body equipment.
1) An initialization sub-process
Setting currentUtcOffsetInitFlag to 0 when a standby PTP equipment program is initialized;
2) receiving currentUtcOffset of the superior grandmaster, and forming a currentUtcOffset subprocess of the body equipment
-the system waits to receive an Announce message;
-if an Announce message is received, parsing out the currentUtcOffset and timeSource values in the message;
judging whether the analyzed timeSource is GPS, if so, setting currentUtcOffset parameters of the equipment to currentUtcOffset, and setting a satellite initialization completion flag currentUtcOffsetInitFlag to be 1.
3. Referring to fig. 8, the procedure of switching the standby PTP device having the grandmaster function to the grandmaster is as follows:
-determining whether it is time to broadcast an Announce message;
if it is the time to broadcast the announcimenessage, it is determined whether currentututufsetinitflag is 1, if currentututufsetinitflag is 1, the announcimessage is broadcast, otherwise it is not broadcast;
-currentUtcOffset in the broadcast Announce message is filled in as currentUtcOffset value calculated according to satellite, timeSource is filled in as HAND _ SET
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (5)
- A currentUtcOffset parameter self-adaptive processing method of PTP over PTN is characterized in that: the PTN link based on the method comprises at least two sets of PTP equipment with Beidou or GPS satellite systems, wherein the PTP equipment is a satellite PTP clock of the PTN link;the method comprises the following steps:step one, respectively setting priorities for the mutually-prepared satellite PTP clocks, and selecting one of the mutually-prepared satellite PTP clocks to serve as a grandmaster in a PTN link through a BMC algorithm;step two, the selected satellite PTP clock serving as the grandmaster in the PTN link automatically acquires correct currentUtcOffset through a Beidou satellite or a GPS satellite for storage, and broadcasts through the Announce message of a PTP protocol;step three, other standby PTP equipment with the function of becoming a grandmaster in the PTN link acquires currentUtcOffset data broadcasted by a satellite PTP clock serving as the grandmaster in the PTN link, then judges the legality of the currentUtcOffset data and stores the currentUtcOffset data as own currentUtcOffset;step four, when the selected satellite PTP clock which is used as the grandmaster in the PTN link does not work, other standby PTP equipment which is used as the grandmaster in the PTN link takes the role of the grandmaster; the specific process of the step four is as follows: judging whether the time is the time for broadcasting the Annunce message; if the time is the time for broadcasting the Announcemessage, judging whether currentUtcOffsetInitFlag is 1, if the currentUtcOffsetInitFlag is 1, broadcasting the Announcemessage, otherwise, not broadcasting the Announcemessage; currentutoffset in the broadcast Announce message is filled in as currentutoffset value calculated according to the satellite, and timeSource is filled in as HAND _ SET.
- 2. The currentUtcOffset parameter adaptive processing method of the PTP over PTN of claim 1, characterized in that: the standby PTP equipment which becomes the grandmaster in the fourth step is standby PTP equipment which is synchronized by the satellite PTP clock which originally serves as the grandmaster in the PTN link and passes currentUtcOffset in the third step.
- 3. The currentUtcOffset parameter adaptive processing method of the PTP over PTN of claim 1, characterized in that: the priority in the first step is set to 0 and 1 respectively.
- 4. The currentUtcOffset parameter adaptive processing method of the PTP over PTN of claim 1, characterized in that: the step two comprises three sub-processes: an initialization sub-process, which is a sub-process for receiving the time difference between the satellite epoch and the UTC to form a currentUtcOffset sub-process and a currentUtcOffset broadcasting sub-process;the initialization sub-process: the initialization time of the satellite PTP clock program is currentUtcOffsetInitFlag to be 0;the time difference between the received satellite epoch and UTC forms a currentutoffset subprocess: receiving the time difference between a GPS epoch and a UTC broadcast by a GPS satellite or the time difference between a Beidou epoch and the UTC broadcast by a Beidou satellite; judging whether the time difference between the GPS epoch or the Beidou epoch and the UTC is received or not, if so, calculating the time difference between the GPS epoch or the Beidou epoch and the UTC, and pushing out the difference between the PTP epoch and the GPS epoch or the difference between the PTP epoch and the Beidou epoch according to the PTP epoch described in the PTP protocol, and finally calculating the time difference between the PTP epoch and the UTC; setting a local currentUtcOffset parameter as the time difference between the PTP epoch and UTC which are obtained by calculation, and setting currentUtcOffsetiInitFlag to 1;the currentutoffset dissemination sub-process: firstly, judging whether the time is the Annunce message broadcasting time; if the Announcemessage time is broadcast, judging whether currentUtcOffsetInitFlag is 1, if so, broadcasting the Announcemessage, filling currentUtcOffset in the broadcasted Announcemessage into currentUtcOffset of satellite calculation, filling GPS by using timeSource, otherwise, not broadcasting.
- 5. The currentUtcOffset parameter adaptive processing method of the PTP over PTN of claim 1, characterized in that: the third step comprises a subprocess of initialization, currentutoffset of a superior grandmaster is received, and a currentutoffset subprocess of the body equipment is formed;the initialization sub-process: setting currentUtcOffsetInitFlag to 0 when a standby PTP equipment program is initialized;the method comprises the following steps of receiving currentUtcOffset of a superior grandmaster, and forming a currentUtcOffset subprocess of the body equipment: the standby PTP equipment system waits for receiving the Announce message; when receiving the Announce message, analyzing the currentUtcOffset and the value of the timeSource in the Announce message; then, whether the analyzed timeSource is GPS is judged, if yes, currentUtcOffset parameter of the device is set to currentUtcOffset, and a satellite initialization completion flag currentUtcOffsetInitFlag is set to be 1.
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| CN101951312A (en) * | 2010-09-15 | 2011-01-19 | 电信科学技术第五研究所 | E1 link-based bidirectional time-frequency synchronous transmission method and master-slave device |
| WO2012171417A1 (en) * | 2011-06-14 | 2012-12-20 | 中兴通讯股份有限公司 | Method and device for clock synchronization |
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| JP5560706B2 (en) * | 2009-12-28 | 2014-07-30 | 富士通株式会社 | Node equipment |
| CN102237996B (en) * | 2010-04-26 | 2014-03-19 | 中兴通讯股份有限公司 | Clock synchronization method and clock synchronization device |
| CN103428081A (en) * | 2012-05-14 | 2013-12-04 | 中兴通讯股份有限公司 | Packet network synchronization method, device and system |
| CN105846937B (en) * | 2015-01-12 | 2019-07-23 | 中兴通讯股份有限公司 | Time processing method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101951312A (en) * | 2010-09-15 | 2011-01-19 | 电信科学技术第五研究所 | E1 link-based bidirectional time-frequency synchronous transmission method and master-slave device |
| WO2012171417A1 (en) * | 2011-06-14 | 2012-12-20 | 中兴通讯股份有限公司 | Method and device for clock synchronization |
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