CN101783725B - Method for outputting synchronous time, device and system thereof - Google Patents
Method for outputting synchronous time, device and system thereof Download PDFInfo
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- CN101783725B CN101783725B CN200910105234.1A CN200910105234A CN101783725B CN 101783725 B CN101783725 B CN 101783725B CN 200910105234 A CN200910105234 A CN 200910105234A CN 101783725 B CN101783725 B CN 101783725B
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Abstract
The embodiment of the invention relates to the field of communication transmission, and particularly discloses a method for acquiring synchronous time, a device and a system thereof. The method comprises the following steps: receiving pseusynchronous time information, processing the pseusynchronous time information and obtaining pseusynchronous time T1; acquiring synchronous time information from a synchronous time source, processing the synchronous time source, obtaining synchronous time T2, calculating a time difference value Delta T of the synchronous time T2 and the pseusynchronous time T1 and storing the difference value Delta T; and when failing to acquire synchronous time information from the synchronous time source, correcting the pseusynchronous time T1 with the stored time difference value Delta T, obtaining corrected time T3 and selecting, and outputting the corrected time T3 as synchronous time of equipment needing to synchronize time. The invention solves the problem that in the prior art, the transmission delays of the two-way transmission channel of the transmission network are different so as to cause low accuracy and the like of the synchronous time obtained by operating the network time protocol.
Description
Technical field
The present invention relates to field of communication transmission, relate in particular to and obtain a kind of methods, devices and systems of exporting lock in time.
Background technology
At present, each operator has set up a large amount of SDH (Synchronous Digital Hierachy, SDH (Synchronous Digital Hierarchy)), MSTP (Multi-Service Transmission, multi-service transport platform), SONET (Synchronous Optical Network, Synchronous Optical Network), OTN (Optical TransmissionNetwork, optical transfer network), the transport network such as PTN, these transport networks have been born current main amount of communication data, and scale and the scope of application are also continuing in expansion.
Meanwhile, requirement synchronous between equipment is also just more and more, and the precision of time synchronized is also promoting to lus rank.For example, the Voice & Video in multimedia service transmission is synchronously play; Under 3G/4G TDD (Time Division Duplex, time division duplex) mode in mobile communication, time slot location, pilot detection etc. need precise time reference; Some value-added services (for example: location) under FDD (Frequency Division Duplex, Frequency Division Duplexing (FDD)) mode also need precise time information; Charging, troubleshooting etc. in communication network also needs more accurate time reference.
At present, the equipment that needs lock in time for BTS (Base Transceiver Station, base transceiver station) etc. provides two kinds of modes lock in time.Wherein first kind of way is by transmitting network delivery lock in time, and the important way of transmitting lock in time by transmitting network delivery is operation NTP (Network TimeProtocol, NTP (Network Time Protocol)), wherein most important and generally use be IEEE1588 agreement.For example, the A transfer equipment in transport network provides lock in time to the BTS being connected with the B equipment in transport network by NTP (Network Time Protocol), and its workflow is roughly as follows:
1, A transfer equipment sends the sync message of a NTP (Network Time Protocol) in the T1 moment to B transfer equipment, sends subsequently one and follows message, includes A transfer equipment and send the time value of above-mentioned sync message in this message.
2, B transfer equipment receives above-mentioned sync message in the T2 moment, and obtains the time value in corresponding T2 moment from the clock of oneself, receives again and follows message subsequently, therefrom obtains the time value in corresponding T1 moment.
3, B transfer equipment sends the time delay request message (Delay_Req Message, time delay request message) of a NTP (Network Time Protocol) to A transfer equipment in the T3 moment, and obtains corresponding T3 moment time value from the clock of oneself.
4, A transfer equipment receives above-mentioned time delay request message in the T4 moment, with rear time delay response message (the Delay_Resp Message that sends a NTP (Network Time Protocol) to B transfer equipment, time delay request message), the time value that contains the corresponding T4 moment in this message.
5, B transfer equipment is receiving after above-mentioned time delay response message, obtain the time value in corresponding T4 moment, utilize the T1 time value previously having obtained simultaneously, T2 time value and T3 time value, by formula T2=T1+Delay+Offset and T4=T3+Delay-Offset, calculate the transmission delay Delay between A transfer equipment and B transfer equipment, the time offset Offset of the clock of the relative A transfer equipment of clock of B transfer equipment, then B transfer equipment is adjusted the clock of B transfer equipment according to transmission delay Delay and time offset Offset, provide A transfer equipment synchronous lock in time with the clock of B transfer equipment for BTS again.
It is all symmetrical in transport network, requiring two Internet Transmission time delay and time offset between transfer equipment, once the fluctuation of above-mentioned time delay changes, the accuracy of the lock in time that makes to obtain through Internet Transmission is reduced.And the circuit difference of signal post's process back and forth between two transfer equipments in reality, so just can not guarantee that two transmission delays on communication direction are identical, therefore transport network, by bearer network time protocol, provides high-precision lock in time just more difficult for such as BTS etc. needs the equipment of lock in time.
In the prior art, for needing the equipment of lock in time, BTS etc. provides the second way of lock in time, be exactly the GPS of receiver reception via satellite (Global Positioning System, global positioning system), GPS (Galileo Positioning System, Galileo navigation system), GLONASS (GLObalNAvigation Satellite System, GLONASS (Global Navigation Satellite System)), Beidou satellite systems etc. have the lock in time that the system of time service function provides, and then by the equipment that offers this lock in time such as BTS etc. and need lock in time.Due to satellite receiver receive said system provide lock in time time, the impact of the factors such as easy climate, environment, cause lock in time of receiving unavailable, the general lock in time that all adopts two satellite receiver to receive said system transmission, realize time backup, unavailable once one of them satellite receiver, just enable immediately the lock in time that said system that another one satellite receiver receives sends, the equipment that continuing as BTS etc. needs lock in time continues to provide lock in time.
Inventor is in research process, find that first kind of way of the prior art at least exists following problem: it is all symmetrical in transport network, requiring two Internet Transmission time delay and time offset between transfer equipment, once the fluctuation of above-mentioned time delay changes, the accuracy of the lock in time that makes to obtain through Internet Transmission is reduced.And the circuit difference of signal post's process back and forth between two transfer equipments in reality, so just can not guarantee that two transmission delays on communication direction are identical, therefore transport network, by bearer network time protocol, provides high-precision lock in time just more difficult for such as BTS etc. needs the equipment of lock in time.And two satellite receiver of equipment configuration that the second way is same BTS etc. needs lock in time, cost is too high.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of methods, devices and systems of exporting lock in time, overcomes the lock in time that pinpoint accuracy can not be provided in prior art, can not realize again the technical problem of time backup cheaply.
The embodiment of the present invention provides a kind of method of exporting lock in time, comprising:
Receive puppet information lock in time, and process described puppet information lock in time, obtain puppet T1 lock in time;
From lock in time source obtain and process information lock in time, obtain T2 lock in time, calculate described lock in time T2 and described pseudo-lock in time T1 difference DELTA T, and preserve described difference DELTA T;
When from described lock in time source obtain information when failure lock in time, revise described pseudo-lock in time of T1 with the described difference DELTA T preserving, obtain correction time T3, select the lock in time of the described correction time T3 of output as the equipment that needs lock in time.
The embodiment of the present invention also provides a kind of device of exporting lock in time, and this device comprises:
Time signal interface, for receiving puppet information lock in time, and processes described puppet information lock in time, obtains puppet T1 lock in time;
Lock in time acquisition module, for from lock in time source obtain information lock in time, and process described lock in time of information, obtain T2 lock in time;
Time difference computing module, for calculate described lock in time T2 and described pseudo-lock in time T1 difference DELTA T, and preserve described difference DELTA T;
Time correcting module, when in described lock in time, acquisition module obtains lock in time information failure, revises described puppet T1 lock in time with described difference DELTA T, obtains correction time T3;
Selection of time module, when acquisition module obtains lock in time information failure in described lock in time, selects the lock in time of the described correction time T3 of output as the equipment that needs lock in time.
The embodiment of the present invention also provides the method for output lock in time based on transport network a kind of, comprising:
The first transfer equipment obtains standard time information from time server, and described standard time information is fitted to the transmission channel of described transport network, obtain the standard time information after adaptation, and in described transport network, transmit the standard time information after described adaptation;
The second transfer equipment receives the standard time information after described adaptation, and the standard time information after described adaptation is gone to adaptation, output pseudo-lock in time of information, and described puppet information lock in time is sent to the equipment side that needs information lock in time;
At the described equipment side that needs lock in time, receive described puppet information lock in time, and process described puppet information lock in time, obtain puppet T1 lock in time; Process from information lock in time that lock in time, source obtained, obtain T2 lock in time, calculate described lock in time T2 and described pseudo-lock in time T1 difference DELTA T, and preserve described difference DELTA T, when from described lock in time source obtain information when failure lock in time, with the described puppet of described difference DELTA T correction T1 lock in time preserving, obtain correction time T3, select the lock in time of the described correction time T3 of output as the equipment that needs lock in time.
The embodiment of the present invention also provides the system of a kind of output lock in time based on transport network, comprising:
The device of the first transfer equipment, the second transfer equipment and output lock in time, described the first transfer equipment and described the second transfer equipment are arranged in described transport network;
Described the first transfer equipment, for obtaining standard time information from time server, and described standard time information is fitted to the transmission channel of described transport network, obtain the standard time information after adaptation, and in described transport network, transmit the standard time information after described adaptation;
Described the second transfer equipment, for receiving the standard time information after described adaptation, and goes adaptation to the standard time information after described adaptation, output pseudo-lock in time of information;
The described device of exporting lock in time, for described puppet information lock in time is processed, the required lock in time of equipment that output needs lock in time.
In the present invention embodiment by from lock in time source obtain lock in time, and utilize the difference between lock in time and pseudo-lock in time to revise lock in time puppet, be exactly a lock in time that accuracy is very high revised pseudo-lock in time, overcome the transmission delay difference of the transmitted in both directions passage of transport network in prior art, caused the not high problem of accuracy of the lock in time that operational network time protocol obtains; Utilize the difference of preserving to revising the pseudo-lock in time sending from transmission network side simultaneously, obtain the pseudo-lock in time of revising, the pseudo-lock in time of this correction be in fact again to lock in time module obtain and process the backup of the lock in time obtaining after information lock in time, this time mode of backup is with low cost.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 shows a kind of method flow diagram of exporting lock in time of the embodiment of the present invention one;
Fig. 2 shows the structure chart of a kind of device of exporting lock in time of the embodiment of the present invention two;
The method flow diagram of Fig. 3 shows the embodiment of the present invention three a kind of output lock in time based on transport network;
The system construction drawing of Fig. 4 shows the embodiment of the present invention four a kind of output lock in time based on transport network;
Fig. 5 shows the structure chart of the 2nd SDH transfer equipment in the embodiment of the present invention four.
Embodiment
Understand and realize the present invention for the ease of persons skilled in the art, now describing by reference to the accompanying drawings embodiments of the invention.At this, schematic description and description of the present invention is used for explaining the present invention, but not as a limitation of the invention.
Pseudo-lock in time of information in the following examples can be that transport network side provides, when certain transfer equipment in transport network has obtained standard time information (standard time information with actual time information conform to) from time server, this standard time information is transferred to another transfer equipment in transport network need to experience a period of time, be exactly transmission delay during this period of time, owing to there being the existence of transmission delay, the temporal information that temporal information is exactly with actual time, information was not inconsistent that in transport network, the last transfer equipment that receives this standard time information obtains, be referred to as puppet information lock in time, this corresponding time of puppet information lock in time is exactly pseudo-lock in time.
The embodiment of the present invention one, as shown in Figure 1, the method comprises a kind of flow chart of the method for exporting lock in time:
Receive puppet information lock in time, and process this puppet information lock in time, obtain puppet T1 lock in time;
From lock in time source obtain information lock in time, process this of information lock in time, obtain T2 lock in time, calculate lock in time T2 with the time difference Δ T of pseudo-lock in time of T1, and preserve this difference DELTA T;
When from lock in time source obtain information when failure lock in time, with the above-mentioned time difference Δ T preserving to pseudo-lock in time T1 revise, obtain correction time T3, select to export the lock in time of correction time T3 as the equipment that needs lock in time.
Be understandable that, when obtaining from source lock in time lock in time when information, also can utilize the above-mentioned time difference Δ T calculating to revise puppet T1 lock in time, obtain revised puppet T1 lock in time, now due to lock in time T2 be available, general all preferential selections, also can select to export the lock in time of revised puppet T1 lock in time as the equipment that needs lock in time at the lock in time of output T2 lock in time as the equipment that needs lock in time.
In the present embodiment, lock in time source, can be GPS (Global Positioning System, global positioning system), GPS (Galileo Positioning System, Galileo navigation system), one or more systems in GLONASS (GLObal NAvigation Satellite System, GLONASS (Global Navigation Satellite System)), Beidou satellite system.These systems all have time service function.When these systems with time service function break down or weather environment very severe, or land is when obtaining the equipment of information lock in time or device and break down for the system that has time service function from these, will cause occurring obtaining the situation of information failure lock in time.
The present embodiment can be effectively to revising pseudo-lock in time, and then obtain accurate lock in time, and the method for the present embodiment also continues when in lock in time, break down in source revising pseudo-lock in time, and then obtain accurate lock in time, continue as and need the equipment of lock in time that be provided lock in time, also just realized the backup to the lock in time that lock in time, source provided, this time backup method is with low cost, does not need expensive satellite receiver.
The structure chart of a kind of device of exporting lock in time of the embodiment of the present invention two, as shown in Figure 2, this device comprises:
Time signal interface, lock in time acquisition module, time difference computing module, time correcting module and selection of time module.
Time signal interface, for receiving puppet information lock in time, and processes this puppet information lock in time, obtains puppet T1 lock in time;
Lock in time acquisition module, for from lock in time source obtain information lock in time, process this information lock in time and obtain T2 lock in time;
Time difference computing module, for calculate lock in time difference T2 with the difference DELTA T of pseudo-lock in time of T1, and preserve this difference DELTA T;
Time correcting module, for lock in time acquisition module obtain information when failure lock in time, puppet T1 lock in time is revised with the above-mentioned difference DELTA T preserving, obtain correction time T3;
Selection of time module, for lock in time acquisition module obtain information when failure lock in time, select the lock in time of output correction time T3 as the equipment that needs lock in time.
Be understandable that, lock in time acquisition module can get lock in time when information, the difference that time correcting module also can calculate with time difference block is revised puppet T1 lock in time, obtain revised puppet T1 lock in time, and this revised puppet T1 correcting module lock in time is input to selection of time module, and lock in time, T2 was also input to selection of time module, selection of time module generally can preferentially select output T2 lock in time as the lock in time that needs equipment lock in time, but also can select to export revised puppet T1 lock in time, as the lock in time that needs equipment lock in time.
In embodiment tri-, as shown in Figure 3, the method comprises the flow chart of the method for output lock in time based on transport network a kind of:
The first transfer equipment obtains standard time information from time server, and this standard time information is fitted to the transmission channel of transport network, obtains the standard time information after adaptation, and in above-mentioned transport network, transmits the standard time information after this adaptation;
The second transfer equipment receives the standard time information after adaptation, and the standard time information after adaptation is gone to adaptation, output pseudo-lock in time of information, and this puppet information lock in time is sent to the equipment side that needs lock in time;
Need the equipment side of lock in time, above-mentioned puppet information lock in time is being processed, exporting lock in time.Needing the equipment side of lock in time, to above-mentioned pseudo-lock in time information process, output can be specially lock in time: pseudo-lock in time of the information that receives that the second transfer equipment sends, and process this information lock in time and obtain pseudo-lock in time of T1; Receive and process from information lock in time that lock in time, source obtained, obtain T2 lock in time, the time difference Δ T of calculating T2 lock in time and puppet T1 lock in time, and preserve this difference DELTA T; When from lock in time source obtain information when failure lock in time, with the above-mentioned time difference Δ T preserving to pseudo-lock in time T1 revise, obtain correction time T3, selection correction time T3 is as the lock in time of the equipment that needs lock in time.
The first transfer equipment obtains standard time information from time server, and standard time information is fitted to the transmission channel of transport network, obtain the standard time information after adaptation, and transmit the step of the standard time information after this adaptation in above-mentioned transport network after, further comprise:
The standard time information after above-mentioned adaptation is pass-through to described the second transfer equipment by transfer equipment between the first transfer equipment and the second transfer equipment.
Further, output also comprises before information pseudo-lock in time:
From transport network, extract line clock, and using this line clock as the output clock of exporting puppet information lock in time.
Be understandable that, in transport network, between the first transfer equipment and the second transfer equipment, may also have a lot of transfer equipments, the temporal information of these transfer equipments after to adaptation is transparent transmission, be that the temporal information after the above-mentioned adaptation of upper transfer equipment transmission is not made any change by each transfer equipment, toward next transfer equipment transmission, until be sent to above-mentioned the second transfer equipment.
In the present embodiment, which can be used as lock in time source specifically referring to be in embodiment mono-about the description in source lock in time, obtain the situation of information failure lock in time specifically referring to the associated description in embodiment mono-.
Transport network in the present embodiment can be SDH transport network, SONET transport network, MSTP transport network, PTN transport network, OTN transport network etc.Take SDH transport network as example, a SDH equipment, the 2nd SDH equipment, is all arranged in same SDH net.The one SDH equipment is after time server obtains standard time information, this standard time information is mapped to VC (Virtual Channel, Virtual Channel), the standard time information after being shone upon transmits the standard time information after mapping in this SDH transport network.And the 2nd SDH equipment is after the standard time information receiving after mapping, tributary card in the 2nd SDH equipment carries out demapping processing to it, obtain payload (in fact the payload is here exactly the temporal information that a SDH equipment obtains), can be using these payloads as pseudo-information output lock in time.It should be noted that the standard time information of obtaining due to a SDH equipment can not change while transmission between a SDH equipment and the 2nd SDH equipment, need spended time and transmit these information, therefore the time that these temporal informations characterize just lags behind the real time, be not and real time synchronized, so these temporal informations are referred to as to puppet information lock in time.Be understandable that pseudo-lock in time, information just referred to that asynchronous with actual time (is generally to lag behind than actual time the time of information representation pseudo-lock in time, also may be leading) temporal information, just refer to and nonsynchronous time of actual time pseudo-lock in time.In SDH transport network, transmission channel refers to Virtual Channel.
The tributary card of the 2nd SDH equipment is carrying out demapping to the temporal information after mapping, in the process of this demapping, relate to pointer adjustment, cause the phase place of the payload that demapping obtains may change (in fact the payload is here exactly the temporal information that a SDH equipment obtains), and then cause the temporal information receiving further to increase with the error of real temporal information.The impact bringing for eliminating this pointer adjustment can be extracted line clock from SDH transport network, the output clock of output payload using this line clock as tributary card.After adopting in this way, can eliminate the variation of the payload phase place that tributary card brings in the adjustment of demapping process pointer, so reduce pseudo-lock in time information and actual time information error.In SDH transport network, in fact the process that standard time information is mapped to Virtual Channel is exactly a process that standard time information is fitted to Virtual Channel, namely the temporal information after mapping is gone to adaptive process and the temporal information after mapping is carried out to demapping process.
Transfer equipment in SONET transport network and MSTP transport network can extract line clock equally from circuit, and using line clock as the output clock of exporting puppet information lock in time.But the transfer equipment in OTN transport network or PTN transport network just cannot extract line clock from circuit, because the working method of OTN transport network and PTN transport network is Asynchronous operation mode, cannot extract line clock.
In the present embodiment, the standard time information one direction of obtaining from time server is passed to the second transfer equipment by the first transfer equipment, then the second equipment is exported puppet information lock in time after relevant processing, then this puppet is revised the pseudo-lock in time that information characterizes lock in time, obtain the correction time, finally, the equipment that needs lock in time is exported and offered to this correction time.This scheme makes transport network not need to move complicated NTP (Network Time Protocol), as IEEE1588 agreement, also avoid the accuracy reduction because of the lock in time obtaining of the asymmetric operational network time protocol causing of transport network transmitted in both directions channel transfer time delay, also still can provide lock in time for the equipment that needs lock in time simultaneously.Can offer multiple equipment that needs lock in time the lock in time of exporting in the present embodiment, that is to say that this multiple equipment shares a temporal information that transmission channel transmits in transport network, has improved the utilance to transmission channel in transport network.
In embodiment tetra-, as shown in Figure 4, this system comprises the system construction drawing of a kind of output lock in time based on transport network:
The device of the first transfer equipment, the second transfer equipment and output lock in time, the first transfer equipment and the second transfer equipment are arranged in same transport network;
The first transfer equipment, for obtaining standard time information from time server, and this standard time information is fitted to the transmission channel of transport network, obtain the standard time information after adaptation, and transmit information lock in time after this adaptation in above-mentioned transport network;
The second transfer equipment, for receiving the standard time information after above-mentioned adaptation, and goes adaptation to the standard time information after adaptation, output pseudo-lock in time of information;
The device of output lock in time comprises: time signal interface, lock in time receiver module, time difference computing module, time correcting module and selection of time module;
Time signal interface, for receiving pseudo-lock in time of the information of the second transfer equipment output, and processes this puppet information lock in time, obtains pseudo-lock in time of T1;
Lock in time acquisition module, for from lock in time source obtain information lock in time, process this information lock in time and obtain T2 lock in time;
Time difference computing module, for calculate lock in time difference T2 with the difference DELTA T of pseudo-lock in time of T1, and preserve this difference DELTA T;
Time correcting module, for lock in time acquisition module obtain information when failure lock in time, puppet T1 lock in time is revised with the above-mentioned difference DELTA T preserving, obtain correction time T3;
Selection of time module, for lock in time acquisition module obtain information when failure lock in time, select the lock in time of correction time T3 as the equipment that needs lock in time.
Be understandable that, lock in time acquisition module can obtain lock in time when information, the difference that time correcting module also can calculate with time difference block is revised puppet T1 lock in time, obtain revised puppet T1 lock in time, and this revised puppet T1 correcting module lock in time is input to selection of time module, and lock in time, T2 was also input to selection of time module, T2 lock in time is as the lock in time that needs equipment lock in time in the general preferentially selection of selection of time module output, but also can export revised puppet T1 lock in time.
Further, system in the present embodiment at least comprises the 3rd transfer equipment, in the transport network of the 3rd transfer equipment between described the first transfer equipment and the second transfer equipment, described the 3rd equipment is for being pass-through to the second transfer equipment to the standard time information after adaptation.The transparent transmission here refers to that the 3rd transfer equipment does not make any change by the standard time information after the adaptation of upper transfer equipment transmission and is sent to next transfer equipment until be sent to the second transfer equipment.
In the system of the present embodiment, the second transfer equipment can also comprise clock board, and this clock board obtains line clock from transport network, and using this line clock as the output clock of exporting puppet information lock in time.For example, in the system of obtaining lock in time based on SDH transport network, the 2nd SDH transfer equipment just can comprise clock board.
The present embodiment also discloses the structure of the 2nd SDH transfer equipment, and as shown in Figure 5, the 2nd SDH transfer equipment comprises: east orientation wiring board, and western to wiring board, cross board, tributary card.One end of east orientation wiring board is connected with the transport network in the 2nd SDH transfer equipment east side, and the other end is connected on cross board.West is connected with the transport network in the 2nd SDH transfer equipment west side to one end of wiring board, and the other end is connected on cross board.Tributary card is used for from the upper and lower branch service of cross board.All there is the function of extracting line clock in east orientation wiring board and west in wiring board, clock board selects the line clock of one of them wiring board extraction as the output clock of tributary card outgoing traffic (in the present embodiment, business refers to puppet information lock in time).Tributary card is according to this output clock, output pseudo-lock in time of information, can eliminate tributary card and adjust the impact on puppet information lock in time at demapping process pointer, specifically referring to the correlation analysis as the output clock of output pseudo-lock in time of information about employing line clock in embodiment tri-.
In the present embodiment, because transport network does not need operational network time protocol, therefore transfer equipment is realized simple.In the time having multiple equipment that needs lock in time to need lock in time, only need be by these multiple equipment connections that need lock in time to the lock in time in the present embodiment system on device, a transmission channel of the transport network in the system of this explanation the present embodiment can be multiple device transmission temporal informations, has improved the utilance to single transmission passage.And the temporal information that the first transfer equipment in the system of the present embodiment obtains is that one-way transmission is to the second transfer equipment, only take a transmission channel, and prior art operational network time protocol carries out passing time, two transmission channels are taken, the first transfer equipment need take a transmission channel in the time that the second transfer equipment transmits message, the second transfer equipment needs again to take a transmission channel in the time that the first transfer equipment transmits message, the present embodiment can be saved transmission channel, reduces the occupancy of transmission time information to transport network loan.The present embodiment also has the effect of time backup, for example: when from lock in time source cannot obtain lock in time when information, after can processing the temporal information of transport network transmission, for needing the equipment of lock in time to continue to provide lock in time, when can obtaining from source lock in time lock in time when information, if transport network breaks down cannot passing time information time, information lock in time that source obtains from lock in time can also being processed, for needing the equipment of lock in time to continue to provide lock in time.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the embodiment of the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (8)
1. the method for the output lock in time based on transport network, is characterized in that, comprising:
The first transfer equipment obtains standard time information from time server, and described standard time information is fitted to the transmission channel of described transport network, obtain the standard time information after adaptation, and in described transport network, transmit the standard time information after described adaptation;
The second transfer equipment receives the standard time information after described adaptation, and the standard time information after described adaptation is gone to adaptation, output pseudo-lock in time of information, and described puppet information lock in time is sent to the equipment side that needs information lock in time;
At the described equipment side that needs lock in time, receive described puppet information lock in time, and process described puppet information lock in time, obtain puppet T1 lock in time; Process from information lock in time that lock in time, source obtained, obtain T2 lock in time, calculate described lock in time T2 and described pseudo-lock in time T1 difference △ T, and preserve described difference △ T, when from described lock in time source obtain information when failure lock in time, with the described puppet of described difference △ T correction T1 lock in time preserving, obtain correction time T3, select the lock in time of the described correction time T3 of output as the equipment that needs lock in time.
2. the method for claim 1, it is characterized in that, described the first transfer equipment obtains standard time information from time server, and described standard time information is fitted to the transmission channel of described transport network, obtain the standard time information after adaptation, and transmit the standard time information step after described adaptation in described transport network after, further comprise:
The standard time information after described adaptation is pass-through to described the second transfer equipment by transfer equipment between described the first transfer equipment and described the second transfer equipment.
3. method as claimed in claim 1 or 2, is characterized in that, described output further comprises before information pseudo-lock in time: from described transport network, extract line clock, and using described line clock as the output clock of exporting puppet information lock in time.
4. the system of the output lock in time based on transport network, is characterized in that, comprising:
The device of the first transfer equipment, the second transfer equipment and output lock in time, described the first transfer equipment and described the second transfer equipment are arranged in described transport network;
Described the first transfer equipment, for obtaining standard time information from time server, and described standard time information is fitted to the transmission channel of described transport network, obtain the standard time information after adaptation, and in described transport network, transmit the standard time information after described adaptation;
Described the second transfer equipment, for receiving the standard time information after described adaptation, and goes adaptation to the standard time information after described adaptation, output pseudo-lock in time of information;
The described device of exporting lock in time, for described puppet information lock in time is processed, the required lock in time of equipment that output needs lock in time;
Wherein, the described device of exporting lock in time comprises:
Time signal interface, for receiving described puppet information lock in time, and processes described puppet information lock in time, obtains puppet T1 lock in time;
Lock in time acquisition module, for from lock in time source obtain information lock in time, and process described lock in time of information, obtain T2 lock in time;
Time difference computing module, for calculate described lock in time T2 and described pseudo-lock in time T1 difference △ T, and preserve described difference △ T;
Time correcting module, when in described lock in time, acquisition module obtains lock in time information failure, revises described puppet T1 lock in time with described difference △ T, obtains correction time T3;
Selection of time module, when acquisition module obtains lock in time information failure in described lock in time, selects the lock in time of the described correction time T3 of output as the equipment that needs lock in time.
5. system as claimed in claim 4, it is characterized in that, described system further comprises at least one the 3rd transfer equipment, in the transport network of described the 3rd transfer equipment between described the first transfer equipment and the second transfer equipment, described the 3rd transfer equipment is for being pass-through to described the second transfer equipment to the standard time information after described adaptation.
6. the system as described in claim 4 to 5 any one claim, it is characterized in that, described the second transfer equipment comprises clock board, for obtaining line clock from described transport network, and using described line clock as the output clock of exporting described puppet information lock in time.
7. a device of exporting lock in time, is characterized in that, described device comprises:
Time signal interface, for receiving puppet information lock in time, and processes described puppet information lock in time, obtains puppet T1 lock in time;
Lock in time acquisition module, for from lock in time source obtain information lock in time, and process described lock in time of information, obtain T2 lock in time;
Time difference computing module, for calculate described lock in time T2 and described pseudo-lock in time T1 difference △ T, and preserve described difference △ T;
Time correcting module, when in described lock in time, acquisition module obtains lock in time information failure, revises described puppet T1 lock in time with described difference △ T, obtains correction time T3;
Selection of time module, when acquisition module obtains lock in time information failure in described lock in time, selects the lock in time of the described correction time T3 of output as the equipment that needs lock in time.
8. a method of exporting lock in time, is characterized in that, comprising:
Receive puppet information lock in time, and process described puppet information lock in time, obtain puppet T1 lock in time;
From lock in time source obtain and process information lock in time, obtain T2 lock in time, calculate described lock in time T2 and described pseudo-lock in time T1 difference △ T, and preserve described difference △ T;
When from described lock in time source obtain information when failure lock in time, revise described pseudo-lock in time of T1 with the described difference △ T preserving, obtain correction time T3, select the lock in time of the described correction time T3 of output as the equipment that needs lock in time.
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| CN102468898B (en) * | 2010-11-19 | 2016-03-30 | 中兴通讯股份有限公司 | The method, apparatus and system of time synchronized are realized in time division multiplex network |
| CN102231656B (en) * | 2011-06-20 | 2016-09-14 | 南京中兴新软件有限责任公司 | Ntp server clock synchronization keeping method, system and device |
| CN103052121B (en) * | 2013-01-04 | 2016-08-03 | 中兴通讯股份有限公司 | A kind of local communication network business switch method, device and system |
| WO2019023906A1 (en) * | 2017-07-31 | 2019-02-07 | 深圳市大疆创新科技有限公司 | Synchronization method, device, and system |
| CN110445571B (en) * | 2019-08-01 | 2021-07-30 | 北京航天发射技术研究所 | Time service system delay error compensation method, system, terminal and storage medium |
| CN111683346B (en) * | 2020-04-29 | 2023-07-25 | 深圳星普森信息技术有限公司 | Method and system for synchronously correcting time of multiple acquisition points based on Bluetooth scattering networking |
| JP6869447B1 (en) * | 2020-07-01 | 2021-05-12 | 三菱電機株式会社 | Time synchronization device, time synchronization system, time synchronization method and program |
| CN115242345B (en) * | 2022-07-28 | 2023-07-28 | 广西自贸区见炬科技有限公司 | Thermoelectric device system time synchronization and real-time resolving processing system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1642068A (en) * | 2004-01-02 | 2005-07-20 | 上海欣泰通信技术有限公司 | Time supply and synchronizing system for telecommunication network |
| US7145837B2 (en) * | 2003-10-14 | 2006-12-05 | International Business Machines Corporation | Global recovery for time of day synchronization |
-
2009
- 2009-01-20 CN CN200910105234.1A patent/CN101783725B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7145837B2 (en) * | 2003-10-14 | 2006-12-05 | International Business Machines Corporation | Global recovery for time of day synchronization |
| CN1642068A (en) * | 2004-01-02 | 2005-07-20 | 上海欣泰通信技术有限公司 | Time supply and synchronizing system for telecommunication network |
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