CN102255791A - Inter-equipment link delay determination method and system - Google Patents

Inter-equipment link delay determination method and system Download PDF

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Publication number
CN102255791A
CN102255791A CN2010101868367A CN201010186836A CN102255791A CN 102255791 A CN102255791 A CN 102255791A CN 2010101868367 A CN2010101868367 A CN 2010101868367A CN 201010186836 A CN201010186836 A CN 201010186836A CN 102255791 A CN102255791 A CN 102255791A
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equipment
link
message
time point
point information
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CN102255791B (en
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李晗
黄晓庆
韩柳燕
王磊
张德朝
魏冰
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China Mobile Communications Group Co Ltd
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China Mobile Communications Group Co Ltd
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Abstract

The invention discloses an inter-equipment link delay determination method and an inter-equipment link delay determination system. The method comprises that: first equipment transmits a first message carrying first time point information to second equipment based on a downlink optical fiber link; the second equipment determines second time point information about the reception of the first message and third time point information about the transmission of a second message based on an uplink optical fiber link; the first equipment determines fourth time point information about the reception of the second message; the first and second equipment switches the uplink and downlink optical fiber links; the first and second equipment perform message interaction based on the switched uplink and downlink optical fiber links to obtain fifth, sixth, seventh and eighth time point information; and the link delay of the uplink and downlink optical fiber links is determined according to each piece of obtained time point information. By the technical scheme provided by the invention, the problem of inter-equipment link delay measurement inaccuracy caused by measurement errors of introduced instruments and meters in the prior art is solved.

Description

Determine the method and system of equipment room link delay amount
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of method and system of definite equipment room link delay amount.
Background technology
Commercial digital mobile communication system largest, that coverage is the widest is global system for mobile communications (GSM, Global System for Mobile Communication) in the global range at present.Gsm system is commonly referred to as second generation mobile communication (2G, The 2nd Generation Mobile Communication) system.Continuous development along with mobile communication technology, adopt code division multiple access to insert (CDMA, Code DivisionMultiple Access) 3G (Third Generation) Moblie of technology (3G, The 3rd Generation MobileCommunication) system also maybe will enter commercial stage.The 3G system is a mainstream technology with wideband CDMA (WCDMA, Wideband CDMA) standard, time-division synchronization CDMA (TD-SCDMA, TimeDivision-Synchronous CDMA) standard and CDMA 2000 standards.
For TD-SCDMA system, CDMA2000 system, time-division synchronous long evolution (TD-LTE, Time Division-Long Term Evolution) communication system such as system, between eating dishes without rice or wine, the base station needs time/Phase synchronization, can adopt global positioning system (GPS at present, Global Positioning System) realize between different base station synchronously, it realizes schematic diagram as shown in Figure 1.
Because each base station all needs to receive the time signal of gps system, therefore the GPS module all will be installed in each base station, this has just wasted more resource, at this problem, prior art proposes to be unified by an equipment time/phase information of acceptance criteria time source (as the gps system time source), then based on 1588 agreements, by transmission network the time/phase information that receives is sent to each base station, as shown in Figure 2, so just do not need each base station that the GPS module all is installed, saved resource effectively.
In the transmission course of transmission time/phase information, usually calculate two link delay amount and time offset between the equipment according to the time point that transmits message between two equipment, thereby realize two time/Phase synchronization between the equipment, wherein first equipment sends message by downlink optical fiber chain road direction second equipment, second equipment sends message by uplink optical fibers chain road direction first equipment, as shown in Figure 3, determine that the concrete processing procedure of the link delay amount of first equipment and second equipment room and time offset is as follows:
Step 31, first equipment is at t 1Time point sends the Sync message based on downlink optical fiber chain road direction second equipment, and first equipment that carries sends the time point t of this Sync message in this Sync message 1Time point information;
Step 32, second equipment is at t 2Time point receives this Sync message based on the downlink optical fiber link, and writes down the transmitting time point t of this Sync message 1With time of reception point t 2
Step 33, second equipment is at t 3Time point sends the Delay_Req message based on uplink optical fibers chain road direction first equipment, and writes down the transmitting time point t of this Delay_Req message 3
Step 34, first equipment is at t 4After time point receives the Delay_Req message based on the uplink optical fibers link, send the Delay_Resp message based on downlink optical fiber chain road direction second equipment, first equipment that carries receives the time point t of Delay_Req message in this Delay_Resp message 4Time point information;
After step 35, second equipment received the Delay_Resp message based on the downlink optical fiber link, first equipment that writes down received the time point t of Delay_Req message 4, this moment, second equipment write down four time points, i.e. t 1, t 2, t 3And t 4
Step 36, second equipment determine according to four time points of record and first equipment between time off-set T OffsetWith link delay amount T Delay, four time points of record and T DelayAnd T OffsetBetween have a following relational expression:
T Delay＝(t 2-T Offset)-t 1 (1)
T Delay＝t 4-(t 3-T Offset) (2)
According to above-mentioned two relational expressions, can calculate the link delay amount T between first equipment and second equipment DelayAnd time off-set T Offset, be specially:
T Delay = ( t 2 - t 1 ) + ( t 4 - t 3 ) 2
T Offset = ( t 2 - t 1 ) + ( t 3 - t 4 ) 2
Second equipment deducts the time off-set T of calculating with the time of self OffsetCan realize and first equipment between time/Phase synchronization.
In above-mentioned processing procedure, the link delay amount between first equipment and second equipment is T DelayThat is to say that acquiescence first equipment is identical to the uplink delay amount that first equipment sends message with second equipment to the down link retardation of second equipment transmission message, but actual communication network mostly is two-way two fine transmission, the uplink optical fibers link adopts different optical fiber with the downlink optical fiber link, therefore the path of uplink optical fibers link and downlink optical fiber link is unequal, first equipment is inequality based on the down link retardation and second equipment that downlink optical fiber chain road direction second equipment sends message based on the uplink delay amount that uplink optical fibers chain road direction first equipment sends message so, this moment, relational expression (1) and relational expression (2) were actually invalid, if second equipment carries out time/Phase synchronization with first equipment according to the method described above, the time offset of then determining is inaccurate, thereby causes the time/phase place between first equipment and second equipment asynchronous.
In order to determine link delay amount accurately, prior art generally adopts optical time domain reflectometer or time test instrument to come the up-downgoing optical fiber link is measured, to obtain up-downgoing optical fiber link retardation, but no matter be optical time domain reflectometer or time test instrument, all need to adopt instrument and meter to measure, so just inevitably introduced the measure error of instrument and meter, cause the measurement of equipment room link delay amount inaccurate, and use instrument and meter to measure the business that must interrupt first equipment and second equipment, make that the flexibility of determining equipment room link delay amount is lower.
Summary of the invention
The embodiment of the invention provides a kind of method and system of definite equipment room link delay amount, in order to solve the measure error owing to the introducing instrument and meter that exists in the prior art, causes the inaccurate problem of measurement of equipment room link delay amount.
Embodiment of the invention technical scheme is as follows:
A kind of method of definite equipment room link delay amount, the method comprising the steps of: first equipment sends first message based on downlink optical fiber chain road direction second equipment, wherein carries the very first time dot information that sends first message; Second equipment determines to receive second time point information of described first message, and sends second message based on uplink optical fibers chain road direction first equipment, determines to send the 3rd time point information of second message; First equipment determines to receive the 4th time point information of second message; First equipment and second equipment switch described uplink optical fibers link and downlink optical fiber link; First equipment sends first message to second equipment once more based on the downlink optical fiber link after switching, and wherein carries the 5th time point information that sends first message; Second equipment determines to receive the 6th time point information of this first message, and sends second message based on uplink optical fibers chain road direction first equipment, determines to send the 7th time point information of second message; First equipment determines to receive the 8th time point information of second message; According to described each time point information, determine the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively.
A kind of system of definite equipment room link delay amount, comprise: first equipment, be used for sending first message based on downlink optical fiber chain road direction second equipment, wherein carry the very first time dot information that sends first message, receive second message that second equipment sends based on the uplink optical fibers link, and determine to receive the 4th time point information of second message, and described uplink optical fibers link and downlink optical fiber link switched, send first message to second equipment once more based on the downlink optical fiber link after switching, wherein carry the 5th time point information that sends first message, receive second message that second equipment sends based on the downlink optical fiber link, determine to receive the 8th time point information of second message; Second equipment, be used to first message that first equipment that receives sends based on the downlink optical fiber link, and definite second time point information that receives first message, send second message based on uplink optical fibers chain road direction first equipment, determine to send the 3rd time point information of second message, and described uplink optical fibers link and downlink optical fiber link switched, receive first message that first equipment sends once more based on the downlink optical fiber link after switching, determine to receive the 6th time point information of this first message, and send second message based on uplink optical fibers chain road direction first equipment, determine to send the 7th time point information of second message; The link delay amount is determined equipment, is used for according to described each time point information, determines the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively.
In the embodiment of the invention technical scheme, first equipment sends first message based on downlink optical fiber chain road direction second equipment, wherein carry the very first time dot information that sends first message, second equipment determines to receive second time point information of described first message, and send second message based on uplink optical fibers chain road direction first equipment, determine to send the 3rd time point information of second message, first equipment determines to receive the 4th time point information of second message, first equipment and second equipment switch described uplink optical fibers link and downlink optical fiber link, first equipment sends first message to second equipment once more based on the downlink optical fiber link after switching, wherein carry the 5th time point information that sends first message, second equipment determines to receive the 6th time point information of this first message, and send second message based on uplink optical fibers chain road direction first equipment, determine to send the 7th time point information of second message, first equipment determines to receive the 8th time point information of second message, according to described each time point information, determine the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively, therefore, first equipment and second equipment carry out obtaining four time point informations behind the message interaction of one-period, uplink optical fibers link and downlink optical fiber link between first equipment and second equipment are incited somebody to action then switch, carry out the message interaction of one-period again, so just can access eight time point informations, just can determine the link delay amount of uplink optical fibers link and downlink optical fiber link this moment according to eight time point informations accurately, do not need to use instrument and meter to measure, avoided the error that instrument and meter brought, therefore can improve effectively and determine equipment room link delay amount accuracy, and, therefore can improve the flexibility of determining equipment room link delay amount effectively owing to do not need the business of first equipment that interrupts and second equipment room.
Description of drawings
Fig. 1 is in the prior art, adopts GPS to realize the realization schematic diagram one of synchronization among base stations;
Fig. 2 is in the prior art, adopts GPS to realize the realization schematic diagram two of synchronization among base stations;
Fig. 3 is in the prior art, determines the method flow schematic diagram of equipment room link delay amount;
Fig. 4 is in the embodiment of the invention, determines the method flow schematic diagram of equipment room link delay amount;
Fig. 5 is in the embodiment of the invention, the uplink downlink schematic diagram one between first equipment and second equipment;
Fig. 6 is in the embodiment of the invention, the uplink downlink schematic diagram two between first equipment and second equipment;
Fig. 7 is in the embodiment of the invention, determines the system configuration schematic diagram of equipment room link delay amount.
Embodiment
At length set forth to the main realization principle of embodiment of the invention technical scheme, embodiment and to the beneficial effect that should be able to reach below in conjunction with each accompanying drawing.
In the embodiment of the invention, it between first equipment and second equipment two-way two fine transmission, the uplink optical fibers link adopts different optical fiber with the downlink optical fiber link, under normal circumstances, first equipment sends message based on downlink optical fiber chain road direction second equipment, and second equipment sends message based on uplink optical fibers chain road direction first equipment, as shown in Figure 5, optical fiber link 1 is the downlink optical fiber link, and optical fiber link 2 is the uplink optical fibers link.
The embodiment of the invention provides a kind of method of definite equipment room link delay amount, and as shown in Figure 4, its concrete processing procedure is as follows:
Step 41, first equipment sends first message based on downlink optical fiber chain road direction second equipment, first equipment that carries in first message sends the very first time dot information of first message, first message can but be not limited to the Sync message, first equipment that carries in the Sync message sends the very first time dot information of this Sync message;
Step 42, second equipment receive first message that first equipment sends based on the downlink optical fiber link, determine to receive second time point information of first message, and second equipment also can be determined the very first time dot information that carries in first message;
Wherein first equipment can be carried at very first time dot information in the Sync message, send to second equipment based on the downlink optical fiber link, first equipment also can adopt other mode to send very first time dot information to second equipment, for example first equipment at first sends the Sync message based on downlink optical fiber chain road direction second equipment, and then based on downlink optical fiber chain road direction second equipment transmission Follow_Up message, first equipment that carries in the Follow_Up message sends the very first time dot information of Sync message, and second equipment is very first time dot information with the time point information that carries in the Follow_Up message that receives.
Step 43, second equipment sends second message based on uplink optical fibers chain road direction first equipment, second equipment determine to send the 3rd time point information of second message, wherein second message can but be not limited to the Delay_Req message;
Step 44, first equipment determine to receive the 4th time point information of second message;
First equipment is behind second message that second equipment that receives sends based on the uplink optical fibers link, also can further send the 3rd message based on downlink optical fiber chain road direction second equipment, first equipment that carries in the 3rd message receives the 4th time point information of second message, wherein the 3rd message can but be not limited to the Delay_Resp message, first equipment that carries in the Delay_Resp message receives the 4th time point information of Delay_Req message;
In step 41～44, the downlink optical fiber link that first equipment uses when second equipment sends message is optical fiber link 1, the uplink optical fibers link that second equipment uses when first equipment sends message is optical fiber link 2, step 41～44 are the message interaction process of period 1 of being carried out between first equipment and second equipment, first equipment and second equipment are behind the message interaction of period 1, can access four time point informations, i.e. very first time dot information, second time point information, the 3rd time point information and the 4th time point information.
Step 45, first equipment and second equipment switch above-mentioned uplink optical fibers link and downlink optical fiber link;
Wherein first equipment and second equipment switch uplink optical fibers link and downlink optical fiber link, can but be not limited to comprise following three kinds of performances:
First kind of performance, initiated to switch by Network Management Equipment: Network Management Equipment is monitored the message interaction situation between first equipment and second equipment in real time, behind the 3rd message that second equipment that monitors, first equipment that receives sends based on the downlink optical fiber link, this Network Management Equipment is confirmed to carry out the switching of up-downgoing optical fiber link, therefore can send switch indicating information to first equipment and second equipment, after first equipment and second equipment receive switch indicating information, the up-downgoing optical fiber link is switched, because each equipment in the communication network all can link to each other with other a plurality of equipment, therefore Network Management Equipment carries the equipment identification information of second equipment in the switch indicating information that sends to first equipment, and in the switch indicating information that sends to second equipment, carry the equipment identification information of first equipment, first equipment is according to the equipment identification information that carries in the switch indicating information that receives, search the up-downgoing optical fiber link that links to each other with second equipment, in like manner, second equipment is searched the up-downgoing optical fiber link that links to each other with first equipment according to the equipment identification information that carries in the switch indicating information that receives;
Second kind of performance, initiated to switch by second equipment: second equipment is behind the 3rd message that first equipment that receives sends based on the downlink optical fiber link, affirmation can be carried out the switching of up-downgoing optical fiber link, second equipment sends handoff request message based on uplink optical fibers chain road direction first equipment, first equipment is after receiving handoff request message, send switching response message based on downlink optical fiber chain road direction second equipment, and after sending switching response message, uplink optical fibers link and downlink optical fiber link are switched, second equipment switches uplink optical fibers link and downlink optical fiber link after receiving switching response message, wherein carry the equipment identification information of second equipment in the handoff request message that second equipment sends, carry the equipment identification information of first equipment in the switching response message that first equipment sends, in order to guarantee that second equipment can receive switching response message, the embodiment of the invention proposes, second equipment sends 3 handoff request message to first equipment continuously, and after receiving two switching response message of first equipment feedback, just carry out the switching of up-downgoing optical fiber link, first equipment whenever receives a handoff request message just to second equipment feedback switching response message, and carries out the switching of up-downgoing optical fiber link after sending out two switching response message;
The third performance: initiated to switch by first equipment: first equipment is after sending the 3rd message based on downlink optical fiber chain road direction second equipment, affirmation can be carried out the switching of up-downgoing optical fiber link, first equipment sends handoff request message based on downlink optical fiber chain road direction second equipment, second equipment is after receiving handoff request message, send switching response message based on uplink optical fibers chain road direction first equipment, and after sending switching response message, uplink optical fibers link and downlink optical fiber link are switched, first equipment switches uplink optical fibers link and downlink optical fiber link after receiving switching response message, wherein carry the equipment identification information of first equipment in the handoff request message that first equipment sends, carry the equipment identification information of second equipment in the switching response message that second equipment sends, in order to guarantee that first equipment can receive switching response message, the embodiment of the invention proposes, first equipment sends 3 handoff request message to second equipment continuously, and after receiving two switching response message of second equipment feedback, just carry out the switching of up-downgoing optical fiber link, second equipment whenever receives a handoff request message just to first equipment feedback switching response message, and carries out the switching of up-downgoing optical fiber link after sending out two switching response message.
In the prior art, generally regard uplink optical fibers link and downlink optical fiber link as an integral body, be that uplink optical fibers link and downlink optical fiber link are formed a complete optical fiber link, if uplink optical fibers link and/or downlink optical fiber link break down, whole complete optical fiber link must be switched to another complete optical fiber link so.
After first equipment and second equipment switch uplink optical fibers link and downlink optical fiber link, as shown in Figure 6, first equipment can send message to second equipment based on the downlink optical fiber link (being optical fiber link 2) after switching, and second equipment can send message to first equipment based on the uplink optical fibers link (being optical fiber link 2) after switching.
In the embodiment of the invention, the two ends of each optical fiber link link to each other with the optical module of equipment respectively, the two ends of the optical fiber link 1 among Fig. 5 link to each other with the transmission optical module of first equipment and the reception optical module of second equipment respectively, the two ends of optical fiber link 2 link to each other with the reception optical module of first equipment and the transmission optical module of second equipment respectively, after the up-downgoing optical fiber link switches to Fig. 6 by Fig. 5, the two ends of optical fiber link 1 link to each other with the reception optical module of first equipment and the transmission optical module of second equipment respectively, and the two ends of optical fiber link 2 link to each other with the transmission optical module of first equipment and the reception optical module of second equipment respectively.
Step 46, first equipment sends first message to second equipment once more based on the downlink optical fiber link after switching, first equipment that carries sends the 5th time point information of first message in this first message, first message can but be not limited to the Sync message, first equipment that carries in the Sync message sends the 5th time point information of this Sync message;
Step 47, second equipment receive first message that first equipment sends based on the downlink optical fiber link, determine to receive the 6th time point information of this first message, can also determine the 5th time point information;
Step 48, second equipment sends second message based on uplink optical fibers chain road direction first equipment, and determine to send the 7th time point information of second message, wherein second message can but be not limited to the Delay_Req message;
Step 49, first equipment determines to receive the 8th time point information of second message;
First equipment is after determining the 8th time point information, can also send the 3rd message based on downlink optical fiber chain road direction second equipment after switching, first equipment that carries in the 3rd message receives eight time point information of second equipment based on second message of uplink optical fibers link transmission, wherein the 3rd message can but be not limited to the Delay_Resp message, first equipment that carries in the Delay_Resp message receives the 6th time point information of Delay_Req message;
In step 46～49, the downlink optical fiber link that first equipment uses when second equipment sends message is optical fiber link 2, the uplink optical fibers link that second equipment uses when first equipment sends message is optical fiber link 1, step 46～49 are the message interaction process of the second round of being carried out between first equipment and second equipment, first equipment and second equipment can access eight time point informations behind the message interaction of second round.
Step 410, according to each time point information, the uplink optical fibers link between definite respectively first equipment and second equipment and the link delay amount of downlink optical fiber link.
Wherein the link delay amount of uplink optical fibers link and downlink optical fiber link is determined respectively in the following way:
T Delay 1 = ( t 4 - t 3 ) + ( t 6 - t 5 ) 2
T Delay 2 = ( t 2 - t 1 ) + ( t 8 - t 7 ) 2
Wherein, T Delay1Link delay amount for the uplink optical fibers link; T Delay2Link delay amount for the downlink optical fiber link; t 1Be very first time dot information; t 2It is second time point information; t 3It is the 3rd time point information; t 4It is the 4th time point information; t 5It is the 5th time point information; t 6It is the 6th time point information; t 7It is the 7th time point information; t 8It is the 8th time point information.
In the embodiment of the invention, determine uplink optical fibers link and downlink optical fiber link the link delay amount can but be not limited to comprise following two kinds of implementations:
First kind of implementation, determined by second equipment: each time point information that first equipment will be determined sends to second equipment by message, and second equipment is determined the link delay amount of uplink optical fibers link and downlink optical fiber link respectively according to each time point information;
Second kind of implementation, determined by Network Management Equipment: each time point information that first equipment and second equipment will be determined sends to Network Management Equipment, Network Management Equipment is determined the link delay amount of uplink optical fibers link and downlink optical fiber link respectively according to each time point information that receives.
In addition, the embodiment of the invention also proposes further to determine the link delay compensation rate, when carrying out time synchronized, can determine T follow-up according to the mode of prior art Offset, again according to the link delay compensation rate determined to T OffsetCompensate and get final product, wherein link delay compensation rate Δ TDetermine in the following way:
Δ T = T Delay 2 - T Delay 1 2
The embodiment of the invention proposes, and can determine the time off-set T between first equipment and second equipment according to the very first time dot information, second time point information, the 7th time point information and the 8th time point information that obtain Offset, also can determine the time offset between first equipment and second equipment, wherein time off-set T according to the 3rd time point information, the 4th time point information, the 5th time point information and the 6th time point information OffsetDetermine in the following way:
T Offset = ( t 2 - t 1 ) + ( t 7 - t 8 ) 2 Perhaps
T Offset = ( t 3 - t 4 ) + ( t 6 - t 5 ) 2
Determining T OffsetAfter, second equipment can be according to T OffsetTime of carrying out/Phase synchronization handles, and self time is deducted T OffsetGet final product.
Wherein link delay compensation rate and time offset can be determined by Network Management Equipment, also can be determined by second equipment.
Determining link delay compensation rate Δ TAfter, first equipment and second equipment switch the up-downgoing optical fiber link, be about to the up-downgoing optical fiber link and switch to Fig. 5 by Fig. 6, follow-up first equipment and second equipment can carry out message interaction according to up-downgoing optical fiber link occupation mode shown in Figure 5, promptly carry out message interaction according to up-downgoing optical fiber link occupation mode of the prior art, need and second equipment time of carrying out at follow-up first equipment/during Phase synchronization, first equipment sends first message based on downlink optical fiber chain road direction second equipment, carry the 9th time point information that sends first message in this first message, second equipment receives first message, and the tenth time point information of determining the 9th time point information and receiving first message, second equipment sends second message based on uplink optical fibers chain road direction first equipment, determine to send the 11 time dot information of second message, first equipment determines to receive the 12 time point information of second message, according to the 9th time point information, the tenth time point information, the 11 time dot information, the 12 time point information and link delay compensation rate Δ T, second equipment and first equipment time of carrying out/Phase synchronization are handled, at first, determine T according to the 9th time point information, the tenth time point information, the 11 time dot information, the 12 time point information Offset, and then according to Δ TTo T OffsetCompensate, with T OffsetWith Δ TAddition deducts T with self time OffsetWith Δ TValue after the addition gets final product.
Wherein, the method of definite link delay amount that the embodiment of the invention proposes can but be not limited to the time of being applied in/phase locked process in, for example, after the link delay amount of determining first optical fiber link and second optical fiber link, can further calculate the fiber lengths of first optical fiber link and second optical fiber link.
By above-mentioned processing procedure as can be known, in the embodiment of the invention technical scheme, first equipment sends first message based on downlink optical fiber chain road direction second equipment, wherein carry the very first time dot information that sends first message, second equipment determines to receive second time point information of described first message, and send second message based on uplink optical fibers chain road direction first equipment, determine to send the 3rd time point information of second message, first equipment determines to receive the 4th time point information of second message, first equipment and second equipment switch described uplink optical fibers link and downlink optical fiber link, first equipment sends first message to second equipment once more based on the downlink optical fiber link after switching, wherein carry the 5th time point information that sends first message, second equipment determines to receive the 6th time point information of this first message, and send second message based on uplink optical fibers chain road direction first equipment, determine to send the 7th time point information of second message, first equipment determines to receive the 8th time point information of second message, according to described each time point information, determine the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively, therefore, first equipment and second equipment carry out obtaining four time point informations behind the message interaction of one-period, uplink optical fibers link and downlink optical fiber link between first equipment and second equipment are incited somebody to action then switch, carry out the message interaction of one-period again, so just can access eight time point informations, just can determine the link delay amount of uplink optical fibers link and downlink optical fiber link this moment according to eight time point informations accurately, do not need to use instrument and meter to measure, avoided the error that instrument and meter brought, therefore can improve effectively and determine equipment room link delay amount accuracy, and, therefore can improve the flexibility of determining equipment room link delay amount effectively owing to do not need the business of first equipment that interrupts and second equipment room.
Accordingly, the embodiment of the invention also provides a kind of system of definite equipment room link delay amount, and its structure comprises that first equipment 71, second equipment 72 and link delay amount determine equipment 73 as shown in Figure 7, wherein:
First equipment 71, be used for sending first message based on downlink optical fiber chain road direction second equipment 72, wherein carry the very first time dot information that sends first message, receive second message that second equipment 72 sends based on the uplink optical fibers link, and determine to receive the 4th time point information of second message, and described uplink optical fibers link and downlink optical fiber link switched, send first message to second equipment 72 once more based on the downlink optical fiber link after switching, wherein carry the 5th time point information that sends first message, receive second message that second equipment 72 sends based on the downlink optical fiber link, determine to receive the 8th time point information of second message
Second equipment 72, be used to first message that first equipment 71 that receives sends based on the downlink optical fiber link, and definite second time point information that receives first message, send second message based on uplink optical fibers chain road direction first equipment 71, determine to send the 3rd time point information of second message, and described uplink optical fibers link and downlink optical fiber link switched, receive first message that first equipment 71 sends once more based on the downlink optical fiber link after switching, determine to receive the 6th time point information of this first message, and, determine to send the 7th time point information of second message based on uplink optical fibers chain road direction first equipment 71 transmissions second message;
The link delay amount is determined equipment 73, is used for according to each time point information, determines the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively.
Preferably, described system also comprises first Network Management Equipment, wherein:
First Network Management Equipment is used for sending switch indicating information to first equipment 71 and second equipment 72 behind the 3rd message that second equipment 72 that monitors, first equipment 71 that receives sends based on down link;
First equipment 71 and second equipment 72 switch described uplink optical fibers link and downlink optical fiber link according to the switch indicating information that first Network Management Equipment sends.
Preferably, first equipment 71 switches described uplink optical fibers link and downlink optical fiber link, specifically comprise: after first equipment 71 is determined the 4th time point information that receives second message, send the 3rd message based on downlink optical fiber chain road direction second equipment 72, after the handoff request message that second equipment 72 that receives sends, send switching response message based on downlink optical fiber chain road direction second equipment 72, and after sending switching response message, described uplink optical fibers link and downlink optical fiber link are switched;
Second equipment 72 switches described uplink optical fibers link and downlink optical fiber link, specifically comprise: after second equipment 72 receives the 3rd message of first equipment based on the transmission of downlink optical fiber link, send handoff request message based on uplink optical fibers chain road direction first equipment 71, receive the switching response message that first equipment 71 sends based on the downlink optical fiber link, and after receiving described switching response message, described uplink optical fibers link and downlink optical fiber link are switched.
Preferably, described link delay amount determines that equipment is arranged in described second equipment; Each time point information that described first equipment 71 is determined sends to second equipment 72 by message respectively; Second equipment 72 is determined the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively according to each time point information that receives and self each definite time point information.
Preferably, described system also comprises second Network Management Equipment, wherein:
Each time point information that first equipment 71 and second equipment 72 will be determined sends to second Network Management Equipment;
Second Network Management Equipment is used to connect each time point information according to receiving, and determines the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively.
First Network Management Equipment in the embodiment of the invention and second Network Management Equipment can but be not limited to place same physical entity.
Preferably, described system comprises that also the link delay compensation rate determines equipment, be used for determining the described uplink optical fibers link that equipment 73 is determined and the link delay amount of descending fiber links, determine the link delay compensation rate between described first equipment 71 and described second equipment 72 according to the link delay amount.
More preferably, also comprise Synchronous Processing equipment, wherein:
Described first equipment 71 also is used for sending first message based on downlink optical fiber chain road direction second equipment 72, wherein carry the 9th time point information that sends first message, second equipment 72 that receives determines to receive the 12 time point information of second message based on second message that the uplink optical fibers link sends;
Described second equipment 72 also is used to first message that first equipment 71 that receives sends based on the downlink optical fiber link, determine to receive the tenth time point information of described first message, and, determine to send the 11 time dot information of second message based on uplink optical fibers chain road direction first equipment 71 transmissions second message;
Described Synchronous Processing equipment, be used for according to described the 9th time point information, the tenth time point information, the 11 time dot information, the 12 time point information and the link delay compensation rate determined, second equipment 72 and first equipment 71 time of carrying out/Phase synchronization are handled.
Preferably, described system comprises that also time offset determines equipment, is used for according to very first time dot information, second time point information, the 7th time point information and the 8th time point information, determines the time offset between described first equipment and 71 second equipment 72;
Or, determine the time offset between described first equipment 71 and second equipment 72 according to described the 3rd time point information, the 4th time point information, the 5th time point information and the 6th time point information.
Wherein time offset determine equipment and link delay compensation rate determine equipment can but be not limited to be arranged in second equipment.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (20)

1. the method for a definite equipment room link delay amount is characterized in that, comprising:
First equipment sends first message based on downlink optical fiber chain road direction second equipment, wherein carries the very first time dot information that sends first message;
Second equipment determines to receive second time point information of described first message, and sends second message based on uplink optical fibers chain road direction first equipment, determines to send the 3rd time point information of second message;
First equipment determines to receive the 4th time point information of second message;
First equipment and second equipment switch described uplink optical fibers link and downlink optical fiber link;
First equipment sends first message to second equipment once more based on the downlink optical fiber link after switching, and wherein carries the 5th time point information that sends first message;
Second equipment determines to receive the 6th time point information of this first message, and sends second message based on uplink optical fibers chain road direction first equipment, determines to send the 7th time point information of second message;
First equipment determines to receive the 8th time point information of second message;
According to described each time point information, determine the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively.
2. the method for definite equipment room link delay amount as claimed in claim 1 is characterized in that, first equipment and second equipment switch described uplink optical fibers link and downlink optical fiber link, specifically comprise:
First equipment and second equipment receive the switch indicating information that Network Management Equipment sends;
First equipment and second equipment switch described uplink optical fibers link and downlink optical fiber link according to the switch indicating information that receives.
3. the method for definite equipment room link delay amount as claimed in claim 1 is characterized in that, first equipment and second equipment switch described uplink optical fibers link and downlink optical fiber link, specifically comprise:
After first equipment is determined the 4th time point information that receives second message, send the 3rd message based on downlink optical fiber chain road direction second equipment;
After second equipment receives described the 3rd message, send handoff request message based on uplink optical fibers chain road direction first equipment;
First equipment sends switching response message based on downlink optical fiber chain road direction second equipment after receiving described handoff request message, and after sending switching response message described uplink optical fibers link and downlink optical fiber link is switched;
Second equipment switches described uplink optical fibers link and downlink optical fiber link after receiving described switching response message.
4. the method for definite equipment room link delay amount as claimed in claim 1 is characterized in that, each time point information that described first equipment is determined sends to second equipment by message respectively;
Second equipment is determined the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively according to each time point information that receives and self each definite time point information.
5. the method for definite equipment room link delay amount as claimed in claim 1 is characterized in that, according to described each time point information, determines the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively, specifically comprises:
Each time point information that first equipment and second equipment will be determined sends to Network Management Equipment;
Described Network Management Equipment is determined the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively according to each time point information that receives.
6. the method for definite equipment room link delay amount as claimed in claim 1 is characterized in that, the link delay amount of described uplink optical fibers link and downlink optical fiber link is determined respectively in the following way:
T Delay 1 = ( t 4 - t 3 ) + ( t 6 - t 5 ) 2
T Delay 2 = ( t 2 - t 1 ) + ( t 8 - t 7 ) 2
Wherein, T Delay1Link delay amount for described uplink optical fibers link; T Delay2Link delay amount for described downlink optical fiber link; t 1Be very first time dot information; t 2It is second time point information; t 3It is the 3rd time point information; t 4It is the 4th time point information; t 5It is the 5th time point information; t 6It is the 6th time point information; t 7It is the 7th time point information; t 8It is the 8th time point information.
7. the method for definite equipment room link delay amount as claimed in claim 1 is characterized in that, also comprises:
According to the link delay amount of described uplink optical fibers link of determining and descending fiber links, determine the link delay compensation rate between described first equipment and described second equipment.
8. the method for definite equipment room link delay amount as claimed in claim 7 is characterized in that, also comprises:
First equipment sends first message based on downlink optical fiber chain road direction second equipment, wherein carries the 9th time point information that sends first message;
Second equipment determines to receive the tenth time point information of described first message, and sends second message based on uplink optical fibers chain road direction first equipment, determines to send the 11 time dot information of second message;
First equipment determines to receive the 12 time point information of second message;
According to described the 9th time point information, the tenth time point information, the 11 time dot information, the 12 time point information and the link delay compensation rate determined, second equipment and first equipment time of carrying out/Phase synchronization are handled.
9. the method for definite equipment room link delay amount as claimed in claim 7 is characterized in that, described link delay compensation rate is determined in the following way:
Δ T = T Delay 2 - T Delay 1 2
Δ TBe the link delay compensation rate between described first equipment and described second equipment.
10. the method for definite equipment room link delay amount as claimed in claim 1 is characterized in that, also comprises:
According to described very first time dot information, second time point information, the 7th time point information and the 8th time point information, determine the time offset between described first equipment and second equipment;
Or, determine the time offset between described first equipment and second equipment according to described the 3rd time point information, the 4th time point information, the 5th time point information and the 6th time point information.
11. the method for definite equipment room link delay amount as claimed in claim 10 is characterized in that, described time offset is determined in the following way:
T Offset = ( t 2 - t 1 ) + ( t 7 - t 8 ) 2 ; Perhaps T Offset = ( t 3 - t 4 ) + ( t 6 - t 5 ) 2
Wherein, T OffsetBe the time offset between described first equipment and second equipment.
12. the method as the described definite equipment room link delay amount of 1～11 arbitrary claim is characterized in that described first equipment is clock equipment; Described second equipment is from clockwork;
Described first message is the Sync message;
Described second message is the Delay_Req message.
13. the system of a definite equipment room link delay amount is characterized in that, comprising:
First equipment, be used for sending first message based on downlink optical fiber chain road direction second equipment, wherein carry the very first time dot information that sends first message, receive second message that second equipment sends based on the uplink optical fibers link, and determine to receive the 4th time point information of second message, and described uplink optical fibers link and downlink optical fiber link switched, send first message to second equipment once more based on the downlink optical fiber link after switching, wherein carry the 5th time point information that sends first message, receive second message that second equipment sends based on the downlink optical fiber link, determine to receive the 8th time point information of second message;
Second equipment, be used to first message that first equipment that receives sends based on the downlink optical fiber link, and definite second time point information that receives first message, send second message based on uplink optical fibers chain road direction first equipment, determine to send the 3rd time point information of second message, and described uplink optical fibers link and downlink optical fiber link switched, receive first message that first equipment sends once more based on the downlink optical fiber link after switching, determine to receive the 6th time point information of this first message, and send second message based on uplink optical fibers chain road direction first equipment, determine to send the 7th time point information of second message;
The link delay amount is determined equipment, is used for according to described each time point information, determines the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively.
14. the system of definite equipment room link delay amount as claimed in claim 13 is characterized in that, also comprises:
First Network Management Equipment is used for sending switch indicating information to first equipment and second equipment behind the 3rd message that second equipment that monitors, first equipment that receives sends based on down link;
First equipment and second equipment switch described uplink optical fibers link and downlink optical fiber link according to the switch indicating information that first Network Management Equipment sends.
15. the system of definite equipment room link delay amount as claimed in claim 13 is characterized in that, first equipment switches described uplink optical fibers link and downlink optical fiber link, specifically comprises:
After first equipment is determined the 4th time point information that receives second message, send the 3rd message based on downlink optical fiber chain road direction second equipment, after the handoff request message that second equipment that receives sends, send switching response message based on downlink optical fiber chain road direction second equipment, and after sending switching response message, described uplink optical fibers link and downlink optical fiber link are switched;
Second equipment switches described uplink optical fibers link and downlink optical fiber link, specifically comprises:
After second equipment receives the 3rd message of first equipment based on the transmission of downlink optical fiber link, send handoff request message based on uplink optical fibers chain road direction first equipment, receive the switching response message that first equipment sends based on the downlink optical fiber link, and after receiving described switching response message, described uplink optical fibers link and downlink optical fiber link are switched.
16. the system of definite equipment room link delay amount as claimed in claim 13 is characterized in that, described link delay amount determines that equipment is arranged in described second equipment;
Each time point information that described first equipment is determined sends to second equipment by message respectively;
Second equipment is determined the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively according to each time point information that receives and self each definite time point information.
17. the system of definite equipment room link delay amount as claimed in claim 13 is characterized in that, also comprises second Network Management Equipment;
Each time point information that first equipment and second equipment will be determined sends to second Network Management Equipment:
Second Network Management Equipment is used for according to each time point information that receives, and determines the link delay amount of described uplink optical fibers link and downlink optical fiber link respectively.
18. the system of definite equipment room link delay amount as claimed in claim 13 is characterized in that, also comprises:
The link delay compensation rate is determined equipment, is used for determining the described uplink optical fibers link that equipment is determined and the link delay amount of descending fiber links according to the link delay amount, determines the link delay compensation rate between described first equipment and described second equipment.
19. the system of definite equipment room link delay amount as claimed in claim 18 is characterized in that, also comprises Synchronous Processing equipment;
Described first equipment also is used for sending first message based on downlink optical fiber chain road direction second equipment, wherein carry the 9th time point information that sends first message, second equipment that receives determines to receive the 12 time point information of second message based on second message that the uplink optical fibers link sends;
Described second equipment also is used to first message that first equipment that receives sends based on the downlink optical fiber link, determine to receive the tenth time point information of described first message, and send second message based on uplink optical fibers chain road direction first equipment, determine to send the 11 time dot information of second message;
Described Synchronous Processing equipment, be used for according to described the 9th time point information, the tenth time point information, the 11 time dot information, the 12 time point information and the link delay compensation rate determined, second equipment and first equipment time of carrying out/order bit synchronization are handled.
20. the system of definite equipment room link delay amount as claimed in claim 13 is characterized in that, also comprises:
Time offset is determined equipment, is used for determining the time offset between described first equipment and second equipment according to described very first time dot information, second time point information, the 7th time point information and the 8th time point information;
Or, determine the time offset between described first equipment and second equipment according to described the 3rd time point information, the 4th time point information, the 5th time point information and the 6th time point information.
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