CN103634091B

CN103634091B - A kind of clock synchronization system of more synchronization fields, method and cross-domain equipment

Info

Publication number: CN103634091B
Application number: CN201210295766.8A
Authority: CN
Inventors: 张君辉; 何力; 赵洪广
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2012-08-20
Filing date: 2012-08-20
Publication date: 2019-05-24
Anticipated expiration: 2032-08-20
Also published as: WO2013189176A3; CN103634091A; WO2013189176A2

Abstract

The invention discloses a kind of clock synchronization system of more synchronization fields, method and cross-domain equipment; its method includes: that Time Synchronization Network is divided into multiple synchronization fields; cross-domain equipment is disposed between synchronization field; synchronized relation is established between synchronization field by the cross-domain equipment; the transmitting of time source information and the protection of time source are carried out between synchronization field, realize the time synchronization between synchronization field.The present invention proposes a kind of synchronous architecture based on more synchronization fields; time synchronization network is divided into multiple synchronization fields; it realizes inter-domain intercommunicate, establish synchronized relation between domain; it realizes and protects and avoid loop between domain between the cross-domain transmitting of time source information, domain, solving the problems, such as can not achieve between multiple synchronization fields in time synchronization network in the prior art protects between inter-domain intercommunicate and domain.

Description

A kind of clock synchronization system of more synchronization fields, method and cross-domain equipment

Technical field

The present invention relates to packet network synchronization technical field more particularly to a kind of clock synchronization systems of more synchronization fields, side Method and cross-domain equipment.

Background technique

With the high speed development of 3G network, PTP (Precision Time Protocol, the Precision Time Protocol) time is same Step agreement is more and more paid attention to and is widely applied in packet network.Domestic and overseas operators are constantly assisted using PTP View carries out time synchronization, and it is same that GPS (Global Position System, global positioning system) progress time is gradually replaced The mode of step.

For time synchronization network, synchronous topology is BMC (the Best Master Clock, when best main by PTP protocol Clock) algorithm come realize select source and establish topology, thought be first in synchronization field elect a highest GM of grade (Grandmaster Clock, grandmother's clock), then completes topological foundation according to the hop count of distance GM；Its advantage is that the whole network A time source can be synchronized with, so at steady state, whole net is in homologous time synchronization state.This time synchronization network Network structure is simple, does not also need cross-domain processing；But with the continuous expansion of Time synchronization technique application field, this time synchronization Framework is increasingly not suitable with large-scale network-estabilishing.Its major defect includes: that (1) network hierarchical structure is unintelligible, leads to the net in later period Network maintenance is extremely difficult；(2) the whole network can not achieve the load sharing of GM and be mutually backups；(3) network is too big, when failure, BMC switching time is long；(4) synchronization link of GM to terminal device (such as base station) is long, introduces more link asymmetry errors.

The prior art allows in synchronous net there are multiple synchronization fields, and similar VPN (Virtual Private Network, it is empty Quasi- private network), it is mutually isolated between synchronization field, but in the networking of this more synchronization fields, can not achieve between domain mutually It is logical, it can not realize and protect between the domain of more synchronization fields.

Summary of the invention

Topic is to provide clock synchronization system, method and the cross-domain equipment of a kind of more synchronization fields between the technology that the present invention solves, Time synchronization network is divided into multiple synchronization fields, inter-domain intercommunicate is realized, establishes synchronized relation between domain, realize time source information across It is protected between domain transmitting, domain.

To solve to inscribe between above-mentioned technology, the present invention provides a kind of method for synchronizing time of more synchronization fields,

Time Synchronization Network is divided into multiple synchronization fields, cross-domain equipment is disposed between synchronization field, by described cross-domain Equipment establishes synchronized relation between synchronization field, and the transmitting of time source information and the protection of time source are carried out between synchronization field, Realize the time synchronization between synchronization field.

Further, the synchronization field includes: Precision Time Protocol domain (PTP domain), time-domain (time Domain), the domain Network Time Protocol (NTP).

Further, the synchronization field is the domain PTP, and the cross-domain device configuration has one or more ports PTP, and described Each port PTP belongs to identical or different synchronization field；

Based on synchronized relation between adjacent synchronization field-lead (master-master) relationship or MS master-slave (master-slave) relationship；

If between the synchronization field being MS master-slave relationship, the synchronizer selection master in slave synchronization field is synchronous The time source disposed in domain synchronizes；

If based between the synchronization field-primary relation, when deploying time source in this synchronization field, synchronizer choosing The time source selected in this synchronization field synchronizes；When deployment time non-in this synchronization field source or this synchronization field in dispose when Between source when breaking down or degrading, then synchronizer selects the time source in other synchronization fields to synchronize.

Further, between the synchronization field based on-primary relation when,

When the cross-domain equipment receives PTP notice (Announce) message of other synchronization fields transmission, set according to originally cross-domain Parameter mapping table remaps the time source parameter in the PTP notification packet between the domain of standby upper configuration, wherein remapping The time source grade of other synchronization fields is lower than the time source grade of this synchronization field afterwards, and based on the time source parameter after mapping, fortune Row best master clock (BMC) algorithm, calculates the state of this port cross-domain equipment PTP, same between the synchronization field to establish Step relationship.

Further, between the synchronization field based on-primary relation when, the method also includes:

When the cross-domain equipment receives the PTP notification packet of other synchronization fields transmission, according to access control between the domain of configuration The rule control that accesses if not meeting access control rule between the domain abandons the PTP notification packet；If symbol Access control rule between the domain is closed, then the time source parameter in the PTP notification packet is remapped.

Further, between the synchronization field based on-primary relation when, it is described after the synchronization field establishes synchronized relation Method further include:

When the cross-domain equipment detect this synchronization field time source it is normal when, the cross-domain equipment is adjacent by what is received The PTP event message that synchronization field is sent is abandoned；

When the cross-domain equipment detects that the time source of this synchronization field breaks down or degrades, the cross-domain equipment root According to the PTP event message that the adjacent sync domain received is sent, time deviation is calculated, the time in the adjacent sync domain is selected Source carries out cross-domain time synchronization；

When the cross-domain equipment detects that the clock source of this synchronization field breaks down or degrades and detect described adjacent When the clock source of synchronization field also breaks down or degrades, then when the synchronizer of this synchronization field reselects in this synchronization field Zhong Yuan.

Further, between the synchronization field based on-primary relation when,

After establishing synchronized relation between the synchronization field, if cross-domain equipment does not receive adjacent sync domain in the given time PTP notification packet, then to the adjacent sync domain send PTP event message；If received, stop to the adjacent sync Domain sends PTP event message.

Further, between the synchronization field be MS master-slave relationship when,

For the port PTP of cross-domain equipment, PTP port status is calculated using cross-domain BMC algorithm；Alternatively, static specified PTP Port status is Master or Slave.

Further, the cross-domain equipment transmits the time source information between synchronization field in the following way:

By the domain method of synchronization: every to pass through a synchronization field when the cross-domain transmitting of PTP notification packet, cross-domain equipment will receive To PTP notification packet in domain number be revised as the domain number of this synchronization field, and increase hop count, other parameters remain unchanged；

Cross-domain transparent transmission mode: cross-domain equipment is patrolling the PTP notification packet received as the cross-domain channel logic TC The entry record entry time stamp for collecting the channel TC, the outlet record Outlet time stamp in the channel logic TC；When by the outlet Between stamp and entry time stamp difference obtain PTP message pass through this synchronization field residence time, to complete cross-domain timing transparent transmission.

Further, the method also includes:

For the different domain class information of each synchronous configuration of territory, the domain class information includes domain number, and/or domain priority 1, and/or domain GM clock grade and/or domain priority 2；

Cross-domain equipment carries out the notice of domain class information, and the domain class information based on each synchronization field runs cross-domain BMC algorithm, Optimal synchronization field is selected, the synchronized relation between domain is established；

Synchronizer in each synchronization field carries out the notice of synchronizing information in domain, runs BMC algorithm in domain and establishes in domain Synchronized relation.

Further, between the synchronization field be MS master-slave relationship when, the method also includes:

When the cross-domain equipment of main synchronization field detect this synchronization field time source it is normal when, the cross-domain equipment to other from Synchronization field sends PTP notification packet, notices the clock grade information of this synchronization field time source；

When the cross-domain equipment of main synchronization field detects that the time source of this synchronization field breaks down or degrades, to other from Synchronization field sends PTP notification packet, notices the clock grade information of this cross-domain equipment.

Further, the method also includes:

Other PTP notification packets that the clock grade information comprising the cross-domain equipment is received from the cross-domain equipment of synchronization field When, between judging whether the domain number in the PTP notification packet, GMid, and/or GM class parameter meet the domain of this cross-domain device configuration Access control rule determines that the main synchronization field is normal if met；Otherwise, it is determined that the main synchronization field failure or degrade, Then the synchronizer of this synchronization field selects and is synchronized to the clock source of other main synchronization fields.

Further, the method also includes:

It configures one or more of synchronization links between synchronization field, and configures for every synchronization link different preferential Grade；

When synchronization link is all normal, the synchronization link of highest priority is selected to carry out cross-domain synchronization；When high priority is same Link failure is walked, then the synchronization link of sub-priority is selected to carry out cross-domain synchronization.

Further, the method also includes preventing loop between domain in the following way:

Parameter value between the domain configured in cross-domain equipment in parameter mapping table is lower than the relevant parameter in this synchronization field Value；

GM id is specified between the domain configured in cross-domain equipment in access control rule.

The present invention also provides a kind of cross-domain equipment, applied to the clock synchronization system including multiple synchronization fields,

The one or more port PTP is configured in the cross-domain equipment, each port PTP is belonging respectively to identical or not Same synchronization field；

The cross-domain equipment is used for, and synchronized relation is established between synchronization field, and time source letter is carried out between synchronization field The time synchronization between synchronization field is realized in the transmitting of breath and the protection of time source.

Further, the synchronization field is the domain PTP；

The one or more port PTP is configured in the cross-domain equipment, each port PTP is belonging respectively to identical or not Same synchronization field.

Further, the cross-domain equipment further comprises that synchronized relation establishes module and time synchronizing module,

The synchronized relation is established module and is used for, and a kind of following synchronization is established between this synchronization field and other synchronization fields Relationship: main-main (master-master) relationship or MS master-slave (master-slave) relationship；

The time synchronizing module is used for, if between this synchronization field and other synchronization fields it is MS master-slave relationship, and this Synchronization field is slave, then the time source disposed in master synchronization field is selected to synchronize；If this synchronization field is synchronous with other It is MS master-slave relationship between domain, then when deploying time source in this synchronization field, selects the time source in this synchronization field to carry out same Step；When deployment time non-in this synchronization field source or this synchronization field in the time source disposed break down or degrade when, then select The time source selected in other synchronization fields synchronizes.

Further, the synchronized relation is established module and is used for, between adjacent sync domain based on-primary relation when, receiving When the PTP sent to other synchronization fields notices (Announce) message, accessed according to access control rule between the domain of configuration Control, if not meeting access control rule between the domain, abandons the PTP notification packet；If visited between meeting the domain Ask control rule, then according to parameter mapping table between the domain configured in this cross-domain equipment to the time source in the PTP notification packet Parameter is remapped, wherein the time source grade for remapping rear other synchronization fields is lower than the time source grade of this synchronization field, and Based on the time source parameter after mapping, best master clock (BMC) algorithm is run, the state of this port cross-domain equipment PTP is calculated, with Establish the synchronized relation between the synchronization field.

Further, the synchronized relation is established module and is used for, and when being MS master-slave relationship between adjacent sync domain, uses Cross-domain BMC algorithm dynamic calculates PTP port status；Or static designated port state is Master or Slave.

Further, the time synchronizing module is used for:

When being MS master-slave relationship between adjacent sync domain, when detecting that the time source of this synchronization field is normal, to other from same It walks domain and sends PTP notification packet, notice the clock grade information of this synchronization field time source；When the time source for detecting this synchronization field When breaking down or degrading, PTP notification packet is sent to other from synchronization field, notices the clock grade letter of this cross-domain equipment Breath；

Based between adjacent sync domain-primary relation when, when detecting that the time source of this synchronization field is normal, by what is received The PTP event message that adjacent sync domain is sent is abandoned；When the time source for detecting this synchronization field breaks down or degrades When, according to the PTP event message that the adjacent sync domain received is sent, time deviation is calculated, the adjacent sync domain is selected Time source carry out cross-domain time synchronization；When the clock source for detecting this synchronization field breaks down or degrades and detects institute When stating the clock source in adjacent sync domain and also breaking down or degrade, then clock source is reselected in this synchronization field.

Further, the synchronized relation is established module and is also used to, the domain etc. in synchronisation domain between other synchronization fields Grade information, and the domain class information based on each synchronization field runs cross-domain BMC algorithm, selects optimal synchronization field, establishes between domain Synchronized relation；

Wherein the domain class information includes that domain number, and/or domain priority 1, and/or domain GM clock grade and/or domain are excellent First grade 2.

Further, the cross-domain equipment further includes time source information transfer module,

The time source information transfer module is used for, and transmits the time source letter between synchronization field in the following way Breath:

By the domain method of synchronization: it is every to pass through a synchronization field when the cross-domain transmitting of PTP notification packet, domain number is revised as working as The domain number of the synchronization field of preceding process, increases hop count, and other parameters remain unchanged；

Cross-domain transparent transmission mode: when the cross-domain transmitting of PTP notification packet, as the cross-domain channel logic TC, to what is received PTP message, the entry record entry time in the channel logic TC stab, the outlet record Outlet time stamp in the channel logic TC；It is logical The difference for crossing Outlet time stamp and entry time stamp show that PTP message passes through the residence time of this synchronization field, thus complete across The timing transparent transmission in domain.

Further, the cross-domain equipment further includes that loop avoids module, and the loop avoids module from being used for, using as follows Mode prevents loop between domain:

In addition, the present invention also provides a kind of clock synchronization system of more synchronization fields, the system comprises multiple synchronization fields, It include one or more synchronizers in each synchronization field, the system also includes timess as described above disposed between synchronization field Cross-domain equipment described in one.

The present invention proposes a kind of synchronous architecture based on more synchronization fields, and time synchronization network is divided into multiple synchronization fields, real Existing inter-domain intercommunicate establishes synchronized relation between domain, realizes and protects and avoid loop between domain between the cross-domain transmitting of time source information, domain, Solving the problems, such as can not achieve between multiple synchronization fields in time synchronization network in the prior art protects between inter-domain intercommunicate and domain.

Using the clock synchronization system of more synchronization fields provided by the invention, method and cross-domain equipment, compared with prior art, Inter-domain intercommunicate, the cross-domain transmitting, pretection switch between domain for realizing more synchronization fields, have reached point domain management effect of time synchronization, Improve the synchronizing quality and maintainability of 1588 synchronous nets.

Detailed description of the invention is each

The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:

Fig. 1 is the schematic diagram of more synchronization field clock synchronization systems of the embodiment of the present invention；

Fig. 2 GM between the domain of the embodiment of the present invention backs up the schematic diagram of (GM1, GM2 are normal)；

Fig. 3 GM between the domain of the embodiment of the present invention backs up the schematic diagram of (under GM1 failure conditions)；

Fig. 4 GM between the domain of the embodiment of the present invention backs up the schematic diagram of (under GM1, GM2 failure conditions)；

Fig. 5 is the schematic diagram that the GM1 of the embodiment of the present invention degrades；

Fig. 6 is the domain-to-domain link backup of the embodiment of the present invention and the schematic diagram that loop avoids；

Fig. 7 avoids the signal of (link A and link B are normal) for the domain-to-domain link backup of the embodiment of the present invention and loop Figure；

Fig. 8 is that the domain-to-domain link backup of the embodiment of the present invention and loop avoid showing for (link A failure, be switched to link B) It is intended to；

Fig. 9 is the schematic diagram of the cross-domain transmitting of the GM information of the embodiment of the present invention；

Figure 10 is the schematic diagram of the cross-domain transparent transmission (logic TC) of the embodiment of the present invention；

Figure 11 is the schematic diagram that more synchronization field loops of the embodiment of the present invention avoid；

Figure 12 is the schematic diagram of the BMC algorithm based on more synchronization fields of the embodiment of the present invention；

Figure 13 is the schematic diagram of the BMC algorithm based on more synchronization fields of the embodiment of the present invention；

The schematic diagram that Figure 14 is switched between the domain failure and domain of the embodiment of the present invention；

The schematic diagram of Figure 15 peer-to-peer architecture (normal condition) of Master-Master between the domain of the embodiment of the present invention；

The schematic diagram of Figure 16 peer-to-peer architecture (1 failure of domain) of Master-Master between the domain of the embodiment of the present invention；

Figure 17 is the schematic diagram of the level framework of more synchronizations of the embodiment of the present invention；

Figure 18 is the schematic diagram of the cross-domain synchronizer of the embodiment of the present invention；

Figure 19 is the schematic diagram of the synchronizing network of the ring network structure of the embodiment of the present invention；

Figure 20 is the logic chart of the client/server of the embodiment of the present invention.

Specific embodiment

It, in the prior art, will be big for convenience of the maintenance and upgrade of network with the continuous expansion of Time Synchronization Network scale Time Synchronization Network be divided into multiple synchronization fields to manage.But in the case of the networking of existing this more synchronization fields, multiple synchronizations It can not achieve intercommunication between domain, can not realize and protect between the domain of more synchronization fields.

For this reason, it is necessary to dispose multiple synchronization fields and multiple time sources in Time Synchronization Network, and needed between synchronization field Intercommunication is wanted, establishes cross-domain synchronous topology link, realizes that loop avoids between the cross-domain transmitting of time source information, domain, failure between domain Detection and cross-domain pretection switch.

It is protected between the inter-domain intercommunicate and domain of more synchronization fields in time synchronization network to realize, the present invention proposes a kind of mostly synchronous The clock synchronization system in domain, using following technical scheme:

Wherein, the synchronization field includes but is not limited to: Precision Time Protocol domain (PTP domain), time-domain (time Domain), the domain Network Time Protocol (NTP), etc..

By taking the domain PTP as an example, above scheme specifically includes following main contents:

1, based on artificial planning or synchronized algorithm, big time synchronization network is divided into multiple synchronization fields, each synchronization field Distribute a domain number；Synchronized relation between synchronization field can be master-slave relationship, i.e. Master-Slave relationship；It can also equity (wherein, the synchronized relation between synchronization field is that master-slave relationship or equity are closed for relationship, i.e. Master-Master master-primary relation System, is in the network planning with regard to configured)；

If being 2, peer-to-peer between synchronization field, and time source is deployed in synchronization field, then synchronizer in synchronization field Preferentially select the time source in this domain；Otherwise, if non-deployment time source or this synchronization field time source failure in this synchronization field/ Degrade, then selects the time source in other domains；

If 3, between synchronization field being master-slave relationship, Slave synchronization field selects the time source of Master synchronization field and progress It is synchronous；

4, time source information allows across third party synchronization field to transmit, and third party's synchronization field can be passed using cross-domain transparent transmission mode Timing signal is passed, it can also be using weight timing mode transmitting；

5, dispose cross-domain equipment between synchronization field, cross-domain equipment be accomplished by the following way and domain between defencive function: (1) Parameter maps between domain；(2) port multiple domain PTP；(3) cross-domain BMC algorithm；And cross-domain equipment needs support domain failure/fall-back detection And notifying mechanism；

6, between synchronization field, one or more synchronization link can be configured, each of the links configure different class parameters, use To realize that the synchronization link between domain backs up；

7, when the cross-domain transmitting of time source information, using artificial planning (parameter maps, the port multiple domain PTP) or cross-domain BMC Algorithm avoids loop between domain.

Present embodiment also provides a kind of method for synchronizing time of more synchronization fields, realizes inter-domain intercommunicate and the domain of more synchronization fields Between protect, mainly include the following contents:

One, PTP message pretreatment (peer-to-peer architecture) between domain

Step 1, PTP message preprocessing function is enabled in cross-domain equipment, and PTP Announce (notice) message is carried out Pretreatment, including between domain parameter mapping and domain between access control；

Step 2, when receiving PTP Announce message, access control inspection between progress domain first, i.e., according to the domain of configuration Between access control rule, and the Announce message relevant information received, for example, domain number, source port ID, GMid, GM priority 1, The parameters such as GM clock grade, GM priority 2, time Source Type, analyse whether to meet access control rule, if met, show Allow inter-domain intercommunicate, then carries out next step；Otherwise, Announce message is abandoned, and is returned；

Step 3, parameter maps between carrying out domain, i.e., according to parameter mapping table between the domain of configuration, to the PTP received Correspondence parameter in Announce message is mapped；If domain difference is revised as the domain number in Announce message The domain number in this domain, and GM parameter in Announce message (including priority 1, clock grade and/or priority 2 etc.) is revised as The value configured in mapping table；Other values remain unchanged；

Step 4, based on the GM parameter after mapping, run existing PTP protocol module, i.e., operation data collection comparison algorithm and State determines algorithm, the state of each port PTP of this equipment is calculated, thus the synchronized relation between establishing domain；

Step 5, cross-domain equipment handles PTP event message:

When the time source of this synchronization field is normal, cross-domain equipment interconnection receives the PTP event message Shi Huizhi of other synchronization fields Discarding is connect, will not be synchronized；

When the time source of this synchronization field breaks down or degrades, then according to the PTP event of other synchronization fields received Message calculates time deviation, carries out time synchronization and (according to the timestamp in PTP event message, obtains 4 time values, then It is calculated according to calculation formula, with specific reference to IEEE-1588v2 standard criterion).

Two, the cross-domain port PTP (client/server)

The port PTP of the prior art cannot be cross-domain, i.e., can only be affiliated between the port PTP configured in cross-domain equipment Synchronization field is timed transmitting, mutually isolated between domain.

The cross-domain port PTP implementation method of the invention, step include:

Step 1, according to artificial planning, big synchronization net is divided into multiple synchronization fields；

Step 2, in the cross-domain equipment between synchronization field, the one or more port PTP, and the specified port PTP institute are configured The synchronization field number of category；

Step 3, to the port PTP of this synchronization field, using existing BMC algorithm dynamic calculating or static designated port shape State；To the cross-domain port PTP, using static configuration mode, designated port state is Master, that is, this synchronization field is as virtual Master equipment provides timing services for other synchronization fields；

Step 4, in this synchronization field, cross-domain equipment is obtained from other equipment in this domain with reference to source information as BC equipment；It is right Other synchronization fields, cross-domain equipment provide for other synchronization fields with reference to source information as OC equipment；I.e. cross-domain equipment is BC+OC Equipment complex；

Step 5, under normal circumstances, this synchronization field has locked the time source of this synchronization field, and at this moment, cross-domain equipment is to other same Notice the clock grade information of this synchronization field time source in step domain；

Step 6, when cross-domain equipment detects time source (such as GM) failure of this synchronization field or degrades, at this moment, cross-domain equipment The clock grade information of this cross-domain equipment is noticed to other synchronization fields.

By the above-mentioned means, when other synchronization fields receive the clock grade information of the cross-domain equipment of notice, if PTP Access rule is (hereafter also called between the parameters such as domain number, GMid, GM grade in notification packet do not meet the domain of this device configuration GM access control rule), then it is assumed that the synchronization field failure degrades；Otherwise it is assumed that the synchronization field is normal.

Three, cross-domain BMC algorithm

Step 1, each synchronization field configures different domain grades, including when domain number and/or domain priority 1, and/or domain GM Clock grade and/or domain priority 2；

Step 2, synchronizer runs the BMC calculation of single domain according to the notice of synchronizing information in existing way progress domain in domain Method establishes the synchronous topology in domain, completes the time synchronization in domain；

Step 3, synchronizer synchronizes the notice of domain information between domain, and runs cross-domain BMC algorithm, cross-domain BMC Algorithm includes: that source parameter is also selected as one of BMC algorithm in domain number, selects optimal domain, establishes the synchronized relation between domain, complete At inter-domain intercommunicate and Time Transmission function.

For the ease of illustrating the present invention, the implementation of technical solution of the present invention is made below with reference to drawings and the specific embodiments It is described in further detail.It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application It can mutual any combination.

Embodiment one

The present embodiment relates generally to GM backup between domain in peer-to-peer architecture (relationship between the main domain of Master-Master master -).

In the present embodiment, time synchronization network is divided into multiple synchronization fields, each synchronization field disposes GM, between synchronization field For peer-to-peer, when inter-domain intercommunicate, needs to pre-process PTP message domain, including joins between access control inspection and domain between domain Number mapping.

Specifically, the arranging access control list in cross-domain equipment, and configure GM parameter mapping table and (be equivalent to based on synchronization The local first grade function in domain), it may be assumed that (1) domain between access control, parameter mapping-domain local first grade between (2) domain specifically include:

1. if synchronizer preferentially selects the GM of this synchronization field to synchronize in domain this synchronization field GM is normal；

2. if being based on domain priority (such as priority 2) this synchronization field GM fails or degrades, selecting other synchronization fields GM synchronize；

3. if new GM is selected in this synchronization field again the GM of this synchronization field and other synchronization fields fails；

4. i.e. inter-domain intercommunicate needs to check legitimacy (access control inspection) in line with principle is distrusted between domain；

5. between two cross-domain equipment, there are Master-Master state (this mode is not present in the prior art) Mutually to send Announce message and event message, but will not synchronize under normal circumstances；When time source failure or degrade When, then the timestamp in the PTP event message in adjacent sync domain can be obtained, time deviation is calculated and corrects the inclined of equipment of itself Difference achievees the purpose that synchronous.

In addition, a kind of optimization method are as follows: it can forbid sending event message, i.e. the port this equipment PTP is Master state, It also needs to check whether the Announce message that can receive opposite end, if a period of time does not receive, sends event message；If It receives, then stops sending event message.Wherein, if receiving the Announce message of other side's transmission, it is shown to be main-main pass System then stops transmission PTP event message to reduce the requirement to network bandwidth and improves bandwidth resources utilization rate.

6. being switched between synchronization field fault detection and domain

By GM access control rule, it can detecte GM place synchronization field failure or degrade, to be switched between generating domain.Tool Body may include the following contents:

(1) other synchronization field failures can be checked.For example, if other synchronization field GM (GMid=1) fail, failure domain A new GM (GM id=2) can be reselected out；At this moment, it can specify in GM access control rule and only trust GM id =1；As long as in this way, GMid=1 failure, then it is assumed that the synchronization field where GMid=1 breaks down；

(2) it can check whether other synchronization fields degrade.For example, if other synchronization field GM (GM id=1) degrade, i.e., ClockClass becomes 20 from 10；At this moment cross-domain equipment is able to detect that the variation, passes through configuration access rule, such as GM id =1 is normal, and the P1/CC/P2 (1/ clock grade of priority/priority 2) of this GM meets certain requirements, and just thinks that this GM can With otherwise it is assumed that GM failure or degrading.

Furthermore, it is possible to configure the access control rule of different Control granularities, for example, can configure detecting domains number whether match, Whether GMid matches；It can also configure while specified GMid, whether detection GM grade matches, etc..

The scene of Fig. 2, Fig. 3, Fig. 4 for two synchronization field intercommunications, one GM of each configuration of territory, two synchronization fields are mutually only It is vertical, it is mutually invisible；Cross-domain equipment T-BC2 and T-BC5 is for realizing cross-domain inter communication.Synchronous Principle is: the GM in this synchronization field is Main GM, priority are high；The GM of other synchronization fields is standby GM, and priority is low.For example, for the equipment in synchronization field 1, GM1 is Main GM, GM2 are standby GM.Synchronous specific steps between domain are as follows:

Step 1, if GM1 and GM2 are normal, at this moment all devices of synchronization field 1 and synchronization field 2 will be run existing PTP protocol establishes the Master-Slave synchronous topology in domain, and selects GM1 and GM2 for grandmother's clock respectively, and foundation is opened up It is as shown in Figure 2 to flutter structure.

Step 2, access control parameter mapping table and domain between is respectively configured between domain on PTP equipment T-BC2 and T-BC5 between domain Rule list (also referred to as GM rule list)；

Wherein GM2 of the GM rule list on the T-BC2 in synchronization field 1 for access synchronized domain 2, and the T- in synchronization field 2 GM rule list on BC5 is used for the GM1 in access synchronized domain 1.

Step 3, between PTP equipment domain, since the port PTP 3 of T-BC2 enables Announce message preprocessing function, Therefore, Announce message needs to carry out GM access control and the mapping of GM parameter；

For example, cross-domain equipment T-BC2 receives Announce message parameter from the cross-domain equipment T-BC5 of synchronization field 2 are as follows:

DomainNumber=2, grandmasterPriority1=2,

GrandmasterClockQuality.clockClass=4,

GrandmasterPriority2=5, grandmasterIdentity=GM2；

Since the parameter that grandmasterIdentity with GM access control rule configures in Announce message is consistent, It is all GM2, therefore access control inspection passes through；

Then, the parameter of Announce message will be mapped as the corresponding parameter of GM parameter mapping table；Treated Announce message parameter are as follows: domainNumber=1, grandmasterPriority1=3, grandmasterClockQ Uality.clockClass=5, grandmasterPriority2=7.

T-BC5 equipment also carries out similar processing, Announce message parameter that treated are as follows:

DomainNumber=2, grandmasterPriority1=2,

GrandmasterClockQuality.clockClass=4, grandmasterPriority2=7.

Step 4, after Announce message is pre-processed, the processing of PTP protocol engine is given.

For the T-BC2 equipment in synchronization field 1, according to information such as priority 1, clockClass, priority 2, use BMC algorithm, the state for calculating the port PTP 1 is Slave, and port 2 and 3 state of port are all Master；To in synchronization field 2 For T-BC5 equipment, according to BMC algorithm, the state for calculating the port PTP 1 is Slave, and port 2 and 3 state of port are all Master.

Step 5, two ports PTP for connecting T-BC2 and T-BC5 are all Master state, then two ports PTP can the period PTP message is sent to other side；At this point, PTP event message will can be lost in addition to Announce message and the common message of other PTP It abandons, because the port PTP is not Slave state at this time.That is, at this moment between two synchronization fields can mutually " seeing " other side, but not into Row time synchronization.

When the GM1 in synchronization field 1 fails (GM2 is still valid), as shown in figure 3, at this moment the synchronizer in synchronization field 1 will It is synchronized to the GM2 of synchronization field 2, specific steps are as follows:

Step 1, after GM1 failure, all synchronizers in synchronization field 1 will run PTP protocol, reselect out new GM Grandmother's clock.

Step 2, the Announce message that T-BC2 equipment is received from the port PTP 3 is reflected by the inspection of GM access control and parameter After penetrating, the processing of PTP protocol engine is given, BMC algorithm is run, calculating 3 state of the port PTP is Slave, the port PTP 1 and port 2 state is Master；

In addition, at this moment the port PTP 3 of T-BC2 equipment will receive the PTP event message of T-BC5 sending, the time is calculated Deviation simultaneously synchronizes.

Step 3, other equipment in synchronization field 1 recalculate the state of each port, finally will select GM2 as ancestral Master clock simultaneously carries out time synchronization, and final calculated synchronization topology is as shown in figure 12.

Step 4, after GM1 restores normal, according to BMC algorithm, synchronization field 1 will reselect GM1 as grandmother's clock simultaneously Carry out time synchronization；Two domains can respectively select the GM in this domain as grandmother's clock and carry out time synchronization.

When the GM2 in synchronization field 2 fails, and the GM1 of synchronization field 1 is still valid, process flow is similar therewith.

In addition, the principle of time synchronization is at this time when GM1 and GM2 fail: only reselecting out some in this domain PTP equipment is as new GM, without selecting some PTP equipment in other domains.

As shown in figure 4, for T-BC2 equipment, due to grandmasterIdentity in the Announce message that receives Be not consistent (GM id is different) with the GM access control rule of configuration, that is, shows that T-BC2 distrusts the GM newly selected in synchronization field 2, Therefore, this Announce message will abandon.The processing of T-BC5 equipment is similar.Thus, the PTP equipment of two synchronization fields will be respectively The GM in this domain is reselected out, without selecting the PTP equipment in other domains as GM.

As shown in figure 5, clock grade clockClass changes when GM1 degrades, for example from 5 become 52, and Other parameters are constant, at this point, also new GM can be selected under the premise of not modifying existing BMC algorithm even if degrading.For example, As shown in figure 5, when GM1 degrades, it will select GM2 as grandmother's clock.Last calculated synchronous topology such as Fig. 5 institute Show.

Embodiment two

The realization that the present embodiment relates generally to domain-to-domain link backup and loop avoids.

In the present invention, other synchronization fields are abstracted as virtual GM, the synchronizer in this domain is abstracted as virtual BC；I.e. virtual BC It is connected to the GM and multiple virtual GM in this domain；As shown in Figure 6.Its specific implementation includes:

1. a plurality of synchronization link between domain configures different priority, domain-to-domain link protection is realized；

Wherein, domain-to-domain link priority is for some domain, for example there are link A and link B for domain 1 and domain 2, to domain 1 For, link A priority is higher than link B；But for domain 2, link B priority can be higher than link A；

For example, the priority of link can be distinguished by configuring different priority 2；Pass through the priority category of link Property, it can be switched between a plurality of synchronization link.

2. loop avoids between domain

Specifically, can pass through: (1) access control rule between domain；Or (2) GM parameter remaps, and prevents loop between domain.

Due to the Announce message issued in this synchronization field, after being looped back to this synchronization field across other synchronization fields, due to Priority has been lowered, for example priority 2 is always lower than the P2 of this synchronization field, so not will form loop.

(1) if GM id changes, priority P 2 is lower than this synchronization field P2, does not have loop；

(2) if GM id does not change, (only by GM ACL (Access Control List, accesses control list) filtering Trust GM1), therefore do not have loop.

As shown in fig. 7, having two synchronization links, respectively link A and link B between synchronization field 1 and synchronization field 2；Wherein, The priority of link A is higher than the priority of link B；When the GM in two synchronization fields is normal, synchronization field 1 and synchronization field 2 Device within the domain all selects the GM in this domain to synchronize；When synchronization field 1 GM failure and the GM of synchronization field 2 is normal, at this moment synchronization field 1 Interior synchronizer will select the GM of synchronization field 2.It specifically includes following key step:

Step 1, two synchronization links configured between domain distribute different priority；

With reference to Fig. 6, for synchronization field 1, synchronizer can be abstracted as a virtual BC equipment in domain, it connect when Between source have 3, one is the true GM in this synchronization field, and corresponding GM parameter is respectively as follows: priority 1=3, clock grade=5, Priority 2=7；Other two is virtual GM (other domains are abstracted as virtual GM)；GM parameter is as shown in 6 figures, at this moment, 3 The priority of GM is distinguished by priority 2.From fig. 6 it can be seen that GM highest priority in domain, the virtual preferential level of GM1 It, virtual GM2 priority is minimum.

Step 2, source algorithm is selected in the equipment operation of synchronization field 1, since GM fails in domain, according to priority height, synchronization field 1 Synchronizer virtual GM1 will be selected as best master clock, i.e. selection synchronization link A.

Step 3, the GM parameter issued in this synchronization field, after being looped back to this synchronization field across other synchronization fields, due to preferential Grade has been lowered, for example priority 2 is always lower than the P2 of this synchronization field, so not will form loop.

Step 4, when between link A failure, domain synchronization link from link A be switched to link B, i.e., synchronization field 1 will select link B As synchronization link.

Embodiment three

The present embodiment relates generally to the cross-domain transmitting of time source information.

The cross-domain transmitting of GM information can be used but be not limited only to the following two kinds mode:

Mode 1, by the domain method of synchronization (logic BC)

Announce message carries GM parameter, including domain number, source port ID, timestamp, P1, CC, P2, GMid, hop count, Time Source Type；When cross-domain transmitting, every to pass through a synchronization field, domain number requires the domain for the synchronization field for being revised as currently passing through Number；Other parameters are constant；Note that hop count needs to increase.

It should be noted that prior art thinks, the domain PTP is mutually isolated between domain similar to VPN property；In fact to synchronous net For, the domain PTP is more suitable as the concept of " area retaining zone ".

At this moment, GM time source is identified not in accordance with GMid, and should be domain+GMid.

Mode 2, cross-domain transparent transmission mode (logic TC)

As shown in Figure 10, intermediate field locks GM2 in advance and completes time synchronization；In addition, in cross-domain equipment BC21 and On BC23, a cross-domain channel logic TC is configured；The cross-domain equipment BC21 in domain 2 regards the entrance in the channel logic TC as, and BC23 is seen Make the outlet in the channel logic TC；To PTP event message, entrance in the channel logic TC, record entry timestamp；It is logical in logic TC The outlet in road, record Outlet time stamp；The difference of Outlet time stamp and entry time stamp, as PTP message staying by synchronization field 2 Stay the time.So as to complete cross-domain timing transparent transmission.

Above two cross-domain transfer mode will be described in detail below.

Mode 1. is by the domain method of synchronization-logic BC

As shown in figure 9, needing to consider the cross-domain problem of transmission of GM information to serial multiple synchronization fields.

For example, 3 access synchronized domain 1 of synchronization field and synchronization field 2；When GM1 and GM2 are normal, and GM3 fails, synchronization field 3 will It is synchronized to GM2；When GM1 is normal, and GM2 and GM3 fail, at this moment synchronization field 3 will need to be synchronized to GM1, at this moment just need reality The existing cross-domain transmitting of GM1.

Specific implementation step specifically includes that

Step 1, two GM rule lists are configured in the port BC32 1 of synchronization field 3, is respectively used to access GM1 and GM2.

Step 2, work as GM2, GM3 failure, synchronization field 2 will synchronous GM1；At this moment, it in the port BC21 1 of synchronization field 2, will not repair Change the GM1id in Announce message, hop count is not also modified, these information will be advertised to synchronization field 3；Meanwhile it should be noted that It is that domain number needs to modify.

Step 3,2 GM rule lists of the BC32 device configuration of synchronization field 3 are respectively used to access GM1 and GM2.

Step 4, when the Announce message that the BC32 BC23 for receiving synchronization field 2 is sent, two GM rule of configuration are checked Then table, discovery meet GM1 access control rule, then will not the Announce message that sends over of filter synchronous domain 2, thus together Step domain 3 can access GM1, to realize the cross-domain transmitting of GM1.

The cross-domain transparent transmission mode-logic TC of mode 2.

Figure 10 show the cross-domain transparent transmission schematic diagram of timing information.At this moment synchronization field 2 is abstracted as a logic TC equipment, i.e., Inbound port of the BC21 of synchronization field 2 as logic TC equipment, exit port of the BC23 as logic TC equipment.Specific steps are mainly wrapped It includes:

Step 1, each synchronization field realizes time synchronization in advance.

Step 2, a channel logic TC is configured in the cross-domain equipment of BC21 and BC23 of synchronization field 2, wherein the end of BC21 Inbound port of the mouth 1 as the channel logic TC, exit port of the port 2 of BC23 as the channel logic TC.

Step 3, when the common message of PTP that the BC21 of synchronization field 2 receives synchronization field 1, then BC23 is passed through by BC22.

Step 4, it when BC21 receives the PTP event message in domain 1, such as Sync message, is then recorded in PTP message fashionable Stab TS1.

Step 5, when BC23 receives PTP event message, time stamp TS2 is recorded out；I.e. event message passes through TS2-TS1 thus The residence time (because domain 2 has synchronized, using identical time reference) of synchronization field 2.

Step 6, synchronization field 3 receives the common message of PTP of synchronization field 1, for example Announce message and domain 1 are established Master-Slave relationship.

Step 7, synchronization field 1 sends PTP event message, across synchronization field 2, reaches synchronization field 3；Synchronization field 3 is reported according to PTP The time stab information of the correctionField (amendment domain) carried in text, can learn the residence time of synchronization field 2, to count Calculate the time deviation that synchronization field 1 arrives synchronization field 3.

Example IV

The present embodiment relates generally to the realization that more synchronization field loops avoid.

Specifically, more synchronization field loops can be avoided by GM access control rule between configuring domain.

Figure 11 show multiple synchronization field synchronizing networks, for example to synchronization field 2, it can be obtained from synchronization field 1 and synchronization field 3 Take GM source information；BC21 is used for the GM1 in access synchronized domain 1, and BC23 is used for the GM3 in access synchronized domain 3.Specific steps are mainly wrapped It includes:

Step 1, when the GM of each synchronization field is normal, the PTP equipment in each synchronization field will select the GM in this domain For grandmother's clock.

Step 2, if the GM2 of synchronization field 2 fails or degrades, and GM1 and GM3 are normal, then according to the configuration of synchronization field 2 GM rule list, the equipment of synchronization field 1 will select GM1 as grandmother's clock and synchronous GM1.

In addition, needing to avoid loop when the interconnection of multiple synchronization fields.If GM2 and GM3 fail or degrade, then at this time The multiple domain synchronous topology that BMC is calculated is as shown in figure 11, since the filtering mapping table of the port 1 of BC32 only trusts GM2, so will not Form multiple domain loop.

Embodiment five

The present embodiment relates generally to the BMC algorithm-Master-Slave client/server based on more synchronization fields.

Master-Slave client/server:

Dynamical fashion is calculated according to current state decision making algorithm；The field parameter P1/cc/p2 of configuration can be identical, can also With difference, the relationship between domain is Master-Slave relationship；

Static mode is based on human configuration, and the port PTP is Master or Slave between domain is arranged.

The method for judging domain failure is as follows:

(1) cross-domain equipment, such as the BC21 and BC23 in domain 2, under the premise of not being synchronized to other domains, if a period of time The GM2 information in this domain is not received inside, then it is assumed that this domain failure；

(2) under the fault condition of domain, cross-domain equipment BC21 and BC23 will not be sent out information between domain；Or send the domain to degrade Information.

1. based on cross-domain BMC algorithm (dynamical fashion)

As shown in figure 12, synchronizing network is made of 4 synchronization fields, and each synchronization field can dispose GM, can not also be disposed GM；Specific steps specifically include that

Step 1, each synchronization field is abstracted as a virtual BC；The effect in domain number is equal to clockID (domain number+clockID BMC is participated in calculate), the P1/CC/P2 of synchronization field is equal to the P1/CC/P2 of synchronizer；(port PTP is divided into two in cross-domain and domain Seed type is calculated for hop count between domain)

Step 2, the parameter of synchronization field, including P1, CC, P2 are configured in boundary synchronisation equipment between domain；Edge device to its What its domain was noticed is the parameter in this domain, rather than the parameter of synchronizer；Such as Figure 12, the edge device of synchronization field 2 is respectively BC21 And BC23, they send the parameter information of synchronization field 2 to synchronization field 1 and synchronization field 4 respectively；And it is connect from synchronization field 1 and synchronization field 4 Receive parameter information；

Illustrate: the identification of cross-domain PTP message: (1) in PTP message increasing cross-domain mark；(2) domain difference is checked, Then think to have received cross-domain information.

Step 3, for BC21, the information of the GM2 in this domain is received, also receives the information of synchronization field 1；At this moment BC21 is transported Row multiple domain BMC algorithm compares field parameter, it is found that the parameter of synchronization field 1 is more preferable, then it is Slave state that port, which is arranged,；And it forces to set It sets port 2 and port 3 is Master state (this 2 ports no longer use BMC to calculate state), and send same to BC22, BC23 Walk the information in domain 1；

Step 4, after BC22, BC23 receive the Announce message of synchronization field 1, judge the cross-domain mark or comparison domain of message Number, discovery receives the information of other synchronization fields, then directly setting the port this PTP is Slave state, and the other ports PTP of juxtaposition are master；To which the synchronizer in synchronization field 2 will synchronize to the GM1, the GM2 without being synchronized to this domain in domain 1；To realize The cross-domain transmitting of GM.

Note: for BC23, after being synchronized to the GM of synchronization field 1, transmission be synchronization field 1 information, rather than this domain Information.

Step 5, when 4 failure of synchronization field 1 and synchronization field that synchronization field 2 connects, then synchronization field 2 will be resynchronized to this domain GM2。

Step 6, when the GM1 failure of synchronization field 1, the cross-domain equipment BC13 of synchronization field 1 passes through BMC algorithm, meter between operation domain Calculating port 2 is Slave state, and port 1,3,4 is Master state；Finally, synchronization field 1, synchronization field 3, synchronization field 4 are all synchronous To synchronization field 2, switched so as to complete between domain.

Step 7, domain topology is established and loop avoids, and compares calculating topology using hop count.

Step 8, topology is established between domain and loop avoids:

(1) Annouce message format is modified, increases hop count (reserve bytes) such as Figure 13 between domain, principal and subordinate is established in domain 1 and domain 2 After relationship, if it is PTP interface between domain receive or sending domain between Announce message, then hop count+1 between domain；To the non-domain in domain Between the port PTP, do not handle；

It (2) is Master by setting BC31, BC43 is between comparison domain after hop count to two cross-domain equipment of BC31 and BC43 Passive。

Embodiment six

The present embodiment relates generally to the BMC algorithm-Master-Master peer-to-peer architecture based on more synchronization fields.

Peer-to-peer architecture Master-Master:

Modify standing state decision making algorithm, if two domains status is identical, such as field parameter P1/CC/P2 equal, then two Domain is all Master, their relationship is the relationship of Master-Master (peer-to-peer)；

Equipment in this time domain preferentially selects the GM in this domain to synchronize.

As shown in figure 15, two synchronization fields, synchronization field 1 are equal with the parameter of synchronization field 2.Edge device calculates between this time domain PTP port status out is all Master.

Step 1, under normal circumstances, when the GM of synchronization field 1 and synchronization field 2 is normal, the device within the domain of two synchronization fields will The GM in this domain is selected to synchronize.

Step 2, when the GM failure of synchronization field 1, T-BC2 will be switched to synchronization field 2, i.e. the port PTP 3 is Slave state, and The port PTP 1 is set and port 2 is Master；As shown in figure 16.

Step 3, other equipment in synchronization field 1 find this domain GM failure or degrade, and will be synchronized to the GM of synchronization field 2；

Step 4, when the GM of synchronization field 1 restores normal, as shown in figure 15, T-BC1 will select GM1 and synchronize it；To T- BC2, when discovery GM1 restores normal, will reset the port PTP 3 is Master state.

Embodiment seven

The present embodiment relates generally to the client/server of more synchronization fields.

As shown in figure 17, time synchronization network is divided into multiple synchronization fields, is master-slave relationship between synchronization field, trusts other domains Principle, be suitble to the synchronization net of single operator；That is:

1. the manually master-slave relationship of planning a lot of synchronization field；

2. the PTP port status human configuration of cross-domain equipment；

PTP equipment is multiple domain synchronizer, its main feature is that:

(1) port PTP in multiple domain synchronizer can be belonging respectively to different synchronization fields, such as Figure 17, the port PTP P11 and P12 belongs to synchronization field 1, and the port PTP P31 belongs to synchronization field 3, and the port PTP P41 belongs to synchronization field 4；

(2) the PTP port status of multiple domain synchronizer can be calculated dynamically (based on BMC algorithm or other algorithms, as BC Equipment), the port PTP is two-way；Can also be using static configuration (as GM equipment), the port PTP is unidirectional；

(3) the mixing apparatus model of BC+OC, for example, in synchronization field 1, as BC equipment；In synchronization field 3 and synchronization field 4 It is middle to be used as GM equipment；

Embodiment eight

The present embodiment relates generally to more synchronization field deployment schemes of loop network.

Current a kind of ring network framework, in order to improve maintainability, using the framework for dividing domain.As shown in figure 19.Together Step domain 1 is convergence ring, and converging the equipment on ring is common PTP equipment, but equipment clock needs to use more advanced clock, than Such as 1 grade of clock or 2 grades of clocks；The equipment on ring is converged i.e. as common BC equipment (in synchronization field 1), also can be used as GM equipment (in other synchronization fields).Access ring divides multiple synchronization fields, mutually isolated between domain.

The Synchronous Principle of client/server are as follows:

(1) time stream information is unidirectionally forwarded from high level to low layer, i.e., time stream information is passed from main synchronization field to from synchronization field It send；

(2) lowermost layer forms mutually isolated different synchronization fields；It is i.e. mutually isolated from synchronization field；

(3) load sharing and the backup of more GM are realized by point domain, a GM equipment belongs to different domains；

As shown in Figure 19, GM2 and GM3 belongs to synchronization field 3 and synchronization field 4；In synchronization field 3, GM2 is main GM, and GM3 is Standby GM；But in synchronization field 4, GM2 is standby GM, and GM3 is main GM.

In addition, a kind of cross-domain equipment is additionally provided in the embodiment of the present invention, it is same applied to the time including multiple synchronization fields Step system, is configured with the one or more port PTP in the cross-domain equipment, and each port PTP is belonging respectively to identical or not Same synchronization field；

Further, the synchronization field is the domain PTP；

Further, the time synchronizing module is used for:

The above is only preferred implementation cases of the invention, are not intended to restrict the invention, and the present invention can also have other Various embodiments, without deviating from the spirit and substance of the present invention, those skilled in the art can be according to this hairs It is bright to make various corresponding changes and modifications, but these corresponding changes and modifications all should belong to appended claims of the invention Protection scope.

Obviously, those skilled in the art should be understood that each module of the above invention or each step can be with general Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored It is performed by computing device in the storage device, and in some cases, it can be to be different from shown in sequence execution herein Out or description the step of, perhaps they are fabricated to each integrated circuit modules or by them multiple modules or Step is fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific hardware and softwares to combine.

Claims

1. a kind of method for synchronizing time of more synchronization fields, which is characterized in that

Time Synchronization Network is divided into multiple synchronization fields, each synchronization field disposes GM, and cross-domain set is disposed between synchronization field It is standby, synchronized relation is established between synchronization field by the cross-domain equipment, the transmitting of time source information is carried out between synchronization field With the protection of time source, the time synchronization between synchronization field is realized；

The synchronization field is the domain PTP, and the cross-domain device configuration has one or more ports PTP, and each port PTP belongs to In identical or different synchronization field；

Based on synchronized relation between adjacent synchronization field-lead (master-master) relationship or MS master-slave (master- Slave) relationship；

If between the synchronization field being MS master-slave relationship, in the synchronizer selection master synchronization field in slave synchronization field The time source of deployment synchronizes；

If based between the synchronization field-primary relation, it is same in this synchronization field when deploying time source in this synchronization field Step equipment selects the time source in this synchronization field to synchronize；When deployment time non-in this synchronization field source or this synchronization field in When the time source of deployment breaks down or degrades, then the synchronizer in this synchronization field selects the time source in other synchronization fields It synchronizes.

2. the method as described in claim 1, which is characterized in that

Based between the synchronization field-primary relation when, the cross-domain equipment receive other synchronization fields transmission PTP notice (Announce) when message, according to parameter mapping table between the domain configured in this cross-domain equipment in the PTP notification packet when Between source parameter remapped, wherein remap rear other synchronization fields time source grade be lower than this synchronization field time source etc. Grade, and based on the time source parameter after mapping, best master clock (BMC) algorithm is run, the shape of this port cross-domain equipment PTP is calculated State, with the synchronized relation established between other described synchronization fields.

3. method according to claim 1 or 2, which is characterized in that based between the synchronization field-primary relation when, the side Method further include:

When the cross-domain equipment receives the PTP notification packet of other synchronization fields transmission, according to access control rule between the domain of configuration Access control, if not meeting access control rule between the domain, abandons the PTP notification packet；If meeting institute Access control rule between domain is stated, then the time source parameter in the PTP notification packet is remapped.

4. method according to claim 1 or 2, which is characterized in that based between the synchronization field-primary relation when, described After synchronization field establishes synchronized relation, the method also includes:

When the cross-domain equipment detect this synchronization field time source it is normal when, adjacent sync that the cross-domain equipment will receive The PTP event message that domain is sent is abandoned；

When the cross-domain equipment detects that the time source of this synchronization field breaks down or degrades, the cross-domain equipment is according to connecing The PTP event message that the adjacent sync domain that receives is sent, calculates time deviation, select the time source in the adjacent sync domain into The cross-domain time synchronization of row；

When the cross-domain equipment detects that the clock source of this synchronization field breaks down or degrades and detect the adjacent sync When the clock source in domain also breaks down or degrades, then the synchronizer of this synchronization field reselects clock in this synchronization field Source.

5. method according to claim 1 or 2, which is characterized in that based between the synchronization field-primary relation when,

After establishing synchronized relation between the synchronization field, if cross-domain equipment does not receive adjacent sync domain in the given time PTP notification packet then sends PTP event message to the adjacent sync domain；If received, stop to the adjacent sync domain Send PTP event message.

6. the method as described in claim 1, which is characterized in that when being MS master-slave relationship between the synchronization field,

For the port PTP of cross-domain equipment, PTP port status is calculated using cross-domain BMC algorithm；Alternatively, the static specified port PTP State is Master or Slave.

7. the method as described in claim 1,2 or 6, which is characterized in that the cross-domain equipment is in the following way in synchronization field Between transmit the time source information:

By the domain method of synchronization: every to pass through synchronization field when the cross-domain transmitting of PTP notification packet, cross-domain equipment will receive The domain number of this synchronization field is revised as in domain number in PTP notification packet, and increases hop count, and other parameters remain unchanged；

Cross-domain transparent transmission mode: cross-domain equipment is as the cross-domain channel logic TC, to the PTP notification packet received, in logic TC The entry record entry time in channel stabs, the outlet record Outlet time stamp in the channel logic TC；It is stabbed by the Outlet time Show that PTP message passes through the residence time of this synchronization field with the difference of entry time stamp, to complete cross-domain timing transparent transmission.

8. method according to claim 1 or 2, which is characterized in that the method also includes:

For the different domain class information of each synchronous configuration of territory, the domain class information include domain number, and/or domain priority 1, And/or domain GM clock grade and/or domain priority 2；

Cross-domain equipment carries out the notice of domain class information, and the domain class information based on each synchronization field runs cross-domain BMC algorithm, selects Optimal synchronization field establishes the synchronized relation between domain；

Synchronizer in each synchronization field carries out the notice of synchronizing information in domain, runs BMC algorithm in domain and establishes the synchronization in domain Relationship.

9. method as described in claim 1 or 6, which is characterized in that when being MS master-slave relationship between the synchronization field, the side Method further include:

When the cross-domain equipment of main synchronization field detect this synchronization field time source it is normal when, the cross-domain equipment is to other from synchronization Domain sends PTP notification packet, notices the clock grade information of this synchronization field time source；

When the cross-domain equipment of main synchronization field detects that the time source of this synchronization field breaks down or degrades, to other from synchronization Domain sends PTP notification packet, notices the clock grade information of this cross-domain equipment.

10. method as claimed in claim 9, which is characterized in that the method also includes:

When other PTP notification packets for receiving the clock grade information comprising the cross-domain equipment from the cross-domain equipment of synchronization field, Judge to visit between whether the domain number in the PTP notification packet, GMid, and/or GM class parameter meet the domain of this cross-domain device configuration It asks control rule, if met, determines that the main synchronization field is normal；Otherwise, it is determined that the main synchronization field failure or degrading, then The synchronizer of this synchronization field selects and is synchronized to the clock source of other main synchronization fields.

11. the method as described in claim 1, which is characterized in that the method also includes:

One or more of synchronization links are configured between synchronization field, and configure different priority for every synchronization link；

When synchronization link is all normal, the synchronization link of highest priority is selected to carry out cross-domain synchronization；When higher priority sync chain Road failure then selects the synchronization link of sub-priority to carry out cross-domain synchronization.

12. method according to claim 2, which is characterized in that the method also includes preventing ring between domain in the following way Road:

Parameter value between the domain configured in cross-domain equipment in parameter mapping table is lower than the corresponding parametric values in this synchronization field；

13. a kind of cross-domain equipment, which is characterized in that applied to the clock synchronization system including multiple synchronization fields, each synchronization field Dispose GM；

The one or more port PTP is configured in the cross-domain equipment, each port PTP is belonging respectively to identical or different Synchronization field, the synchronization field are the domain PTP；

The cross-domain equipment is used for, and synchronized relation is established between synchronization field, and time source information is carried out between synchronization field The time synchronization between synchronization field is realized in the protection of transmitting and time source；

The cross-domain equipment further comprises that synchronized relation establishes module and time synchronizing module,

The synchronized relation is established module and is used for, and a kind of following synchronous pass is established between this synchronization field and other synchronization fields System: main-main (master-master) relationship or MS master-slave (master-slave) relationship；

The time synchronizing module is used for, if between this synchronization field and other synchronization fields being MS master-slave relationship, and this synchronization Domain is slave, then the time source disposed in master synchronization field is selected to synchronize；If this synchronization field and other synchronization fields it Between based on-primary relation, then when deploying time source in this synchronization field, the synchronizer in this synchronization field is selected in this synchronization field Time source synchronize；When deployment time non-in this synchronization field source or this synchronization field in the time source disposed break down Or when degrading, the synchronizer in this synchronization field then selects the time source in other synchronization fields to synchronize.

14. cross-domain equipment as claimed in claim 13, which is characterized in that

The synchronized relation is established module and is used for, between adjacent sync domain based on-primary relation when, receiving other synchronization fields hair When PTP notice (Announce) message sent, accessed control according to access control rule between the domain of configuration, if do not met Access control rule between the domain then abandons the PTP notification packet；If meeting access control rule between the domain, root The time source parameter in the PTP notification packet is remapped according to parameter mapping table between the domain configured in this cross-domain equipment, The time source grade for wherein remapping rear other synchronization fields is lower than the time source grade of this synchronization field, and based on the time after mapping Source parameter runs best master clock (BMC) algorithm, calculates the state of this port cross-domain equipment PTP, to establish and described other are same Walk the synchronized relation between domain.

15. cross-domain equipment as claimed in claim 13, which is characterized in that

The synchronized relation is established module and is used for, dynamic using cross-domain BMC algorithm when being MS master-slave relationship between adjacent sync domain State calculates PTP port status；Or static designated port state is Master or Slave.

16. the cross-domain equipment as described in claim 13,14 or 15, which is characterized in that

The time synchronizing module is used for:

When being MS master-slave relationship between adjacent sync domain, when detecting that the time source of this synchronization field is normal, to other from synchronization field PTP notification packet is sent, the clock grade information of this synchronization field time source is noticed；When the time source for detecting this synchronization field occurs Failure or when degrading, sends PTP notification packet to other from synchronization field, notices the clock grade information of this cross-domain equipment；

Based between adjacent sync domain-primary relation when, it is adjacent by what is received when detecting that the time source of this synchronization field is normal The PTP event message that synchronization field is sent is abandoned；When the time source for detecting this synchronization field breaks down or degrades, root According to the PTP event message that the adjacent sync domain received is sent, time deviation is calculated, the time in the adjacent sync domain is selected Source carries out cross-domain time synchronization；When the clock source for detecting this synchronization field breaks down or degrades and it is described adjacent to detect When the clock source of synchronization field also breaks down or degrades, then clock source is reselected in this synchronization field.

17. the cross-domain equipment as described in claim 13,14 or 15, which is characterized in that

The synchronized relation is established module and is also used to, the domain class information in synchronisation domain between other synchronization fields, and is based on The domain class information of each synchronization field runs cross-domain BMC algorithm, selects optimal synchronization field, establishes the synchronized relation between domain；

Wherein the domain class information includes domain number, and/or domain priority 1, and/or domain GM clock grade and/or domain priority 2。

18. the cross-domain equipment as described in claim 13,14 or 15, which is characterized in that the cross-domain equipment further includes time source Information transfer module,

The time source information transfer module is used for, and transmits the time source information between synchronization field in the following way:

By the domain method of synchronization: it is every to pass through a synchronization field when the cross-domain transmitting of PTP notification packet, domain number is revised as currently passing through The domain number for the synchronization field crossed, increases hop count, and other parameters remain unchanged；

Cross-domain transparent transmission mode: when the cross-domain transmitting of PTP notification packet, as the cross-domain channel logic TC, the PTP received is reported Text, the entry record entry time in the channel logic TC stab, the outlet record Outlet time stamp in the channel logic TC；By described The difference of Outlet time stamp and entry time stamp show that PTP message passes through the residence time of this synchronization field, to complete cross-domain to determine When transparent transmission.

19. the cross-domain equipment as described in claim 13,14 or 15, which is characterized in that the cross-domain equipment further includes that loop is kept away Exempt from module, the loop avoids module from being used for, loop between domain is prevented in the following way:

20. a kind of clock synchronization system of more synchronization fields, which is characterized in that the system comprises multiple synchronization fields, each synchronization GM is disposed in domain, includes one or more synchronizers in each synchronization field, the system also includes what is disposed between synchronization field Such as the described in any item cross-domain equipment of claim 13 to 19.