CN100464544C - Method for obtaining minimum multiframe number in virtual cascade group during virtual cascade processing - Google Patents
Method for obtaining minimum multiframe number in virtual cascade group during virtual cascade processing Download PDFInfo
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- CN100464544C CN100464544C CNB2003101210738A CN200310121073A CN100464544C CN 100464544 C CN100464544 C CN 100464544C CN B2003101210738 A CNB2003101210738 A CN B2003101210738A CN 200310121073 A CN200310121073 A CN 200310121073A CN 100464544 C CN100464544 C CN 100464544C
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Abstract
This invention relates to a method for obtaining the minimum multi-frame number in a virtual cascade set, which compares and determines the multi-frame numbers based on the different values of two numbers and the time delay levels supported by the system and obtains the minimum multi-frame number. This invention also can determine if the related time delay between the two frames exceeds the delay sphere supported by the system, if so, it generates related delay alarm, not necessary to compare the multi-frame numbers.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to the method for obtaining minimum multiple frame number in the virtual cascade group in a kind of Virtual Concatenation processing procedure.
Background technology
VC (Virtual Concatenation, Virtual Concatenation) technology has realized can transmitting the cascade business in the equipment of not supporting the cascade business, according to different service needed bandwidth is distributed to the user flexibly simultaneously.Do not need continuously between the member of formation Virtual Concatenation payload.In SDH (Synchronous Digital Hierarchy) network, the member of Virtual Concatenation payload can pass different network paths between node, and it is just passable that the equipment that is only required in the network terminal can be handled Virtual Concatenation, and middle node device does not need to have the function of handling Virtual Concatenation.
The processing of Virtual Concatenation technology comprises following two main points:
1, up direction generates the multiple frame number and the sequence number of each physical channel in the virtual cascade group according to agreement G.707, as shown in Figure 1;
2, down direction is delayed time the business of each physical channel of the different routes transmission of process in the virtual cascade group to align according to multiple frame number and is exported, and finishes the ordering of sequence number simultaneously.
In the Virtual Concatenation processing procedure, the time-delay alignment function based on each multiple frame number has important function.Usually the realization of time-delay alignment is that one of them passage in the selection virtual cascade group is a reference channel, with this passage rest channels is done the time-delay registration process, relative time delay between the passage is by the multiple frame number difference decision of two passages, and when the difference of this multiple frame number has exceeded the time-delay grade of system's support, also to produce time-delay and exceeding alarm.Reference channel normally selects to have in the virtual cascade group passage of maximum routing delay, just the passage of its multiple frame number value minimum at one time.Therefore, obtain the multiple frame number of minimum in each member channel in the virtual cascade group, just become the key that realizes the time-delay alignment function in the Virtual Concatenation processing procedure.
Yet, be example with virtual cascade group VC-3-XV, the multiple frame number of each physical channel all is from 0～4095 cycle count, the multiple frame number difference between per two passages is again at random fully, therefore, relatively determines relatively difficulty of the multiple frame number size of interchannel.
The method of obtaining minimum multiple frame number that adopts at present mostly is semicircular method, the semicircular method method of frame number relatively again is to regard the data of 0～4095 such circulation as a circle, determine several relatively districts at the data place of size according to the high position of data then, and determine magnitude relationship between each multiple frame number according to each interval magnitude relationship.For example, referring to Fig. 2, stipulate the data among the figure, the A district is bigger than the C district all the time, the C district is bigger than the B district, the B district is bigger than the A district again, existing 10 and 1,300 two data, being easy to determine two data magnitude relationship according to described regulation is 1300 greater than 10, determines that promptly corresponding minimum multiple frame number is 10, if two data 10 and 4000 are arranged, determine 10 greater than 4000 according to described regulation equally, determine that minimum multiple frame number is 4000, if two data in same district, are then just directly relatively determined the magnitude relationship of two multi-frames.Determine that in a plurality of multi-frames minimum multiple frame number processing procedure is similar.
All adopt identical comparative approach for different time-delay grades in definite method of the multiple frame number of above-mentioned existing minimum, certain such as two multiple frame number differences, if use this semicircular method to compare, the size of these two multiple frame numbers is all fixed under the situation of system's support different delayed time grade so, at this moment, a unique comparative result will be obtained, yet, because implication may be different under the situation of different time-delay grades for the difference of two multiple frame numbers, cause existing multiple frame number comparative approach tight inadequately, sometimes even may make a mistake.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide the method for obtaining minimum multiple frame number in the virtual cascade group in a kind of Virtual Concatenation processing procedure, determine corresponding minimum multiple frame number neatly with the time-delay grade of supporting according to system, and guarantee in the Virtual Concatenation processing procedure, can also produce Delayed Alarm information accurately.
The objective of the invention is to be achieved through the following technical solutions:
Obtain the method for minimum multiple frame number in the virtual cascade group in a kind of Virtual Concatenation processing procedure, comprising:
A, obtain in the virtual cascade group differences of two multiple frame numbers, and determine the delay value between two multi-frames;
B, judge the residing district of delay value between described two multi-frames, if be in the service area, then the multiple frame number of the multi-frame that multiple frame number absolute value is little in two multi-frames is less; If be in confusion region, then the multiple frame number of the multi-frame that multiple frame number absolute value is big in two multi-frames is less; Determine multiple frame number minimum in the described virtual cascade group according to the multiple frame number comparative result of per two multi-frame correspondences;
The time range value of described service area is the time period of the 0 time-delay grade that allows to system, the time range value of described confusion region is that total duration deducts the time period of described time-delay grade to total duration, and the multiple frame number of maximum that described total duration equals in the virtual cascade group is on duty to transmit the needed time of a frame.
Described step B also comprises:
If the residing district of delay value between described two multi-frames is a detection zone, then can't determine less multiple frame number, and produce Delayed Alarm that described detection zone is all the other time periods except service area, confusion region in total duration scope.
Described steps A comprises:
Obtain the difference of two multiple frame numbers in the virtual cascade group;
Described difference is converted to delay value between corresponding two multi-frames according to the time of transmitting frame data.
Also comprise in this method:
Time-delay grade and the multiple frame number of the maximum in the virtual cascade group according to system's support are determined corresponding work district, detection zone and three zones of confusion region.
Described steps A comprises:
In Synchronous Digital Hierarchy SDH system, obtain the difference of the multiple frame number that need carry out multiple frame number size two multi-frames relatively, and multiply by the frame period 125us that the ITU-T of International Telecommunications Union stipulates with this difference, obtain the delay value between two multi-frames.
This method also comprises:
Determine that the time that transmission 4096 frames need in the SDH system is 512ms;
Determine the maximum delay value of permission according to the time-delay grade of system's support, and described 512ms is divided into three zones: service area, detection zone and confusion region according to described maximum delay value, described service area is 0 time range to the maximum delay value, described detection zone is the time range of maximum delay value to " 512ms deducts the maximum delay value ", and described confusion region is " 512ms the deducts the maximum delay value " time range to 512ms.
By technical scheme that the invention described above provided as can be seen, among the present invention, adopted according to system and supported the difference of reference time delay (grade of promptly delaying time) that the acquisition process of the multiple frame number of minimum is handled flexibly, promptly carried out the more definite of multiple frame number size according to the difference of two multiple frame numbers and the time-delay grade of system's support; Like this, can compare the size of the multiple frame number of two multi-frame correspondences on the one hand, so that from virtual cascade group, obtain the multiple frame number of the minimum that needs, can also determine on the other hand whether two relative time delaies between multi-frame exceed the reference time delay that system supports, if exceed, then determine system's registration process of can't having delayed time exactly, and produce corresponding Delayed Alarm, and need not to carry out again the comparison of multiple frame number size.The present invention makes in the processing procedure of the multiple frame number of minimum of each member channel in obtaining virtual cascade group, can produce more that the time-delay of closing to reality exceeds alarm, makes that further the time-delay registration process in the Virtual Concatenation processing procedure is more accurate.
Description of drawings
Fig. 1 is multiple frame number and the sequence number schematic diagram in the Virtual Concatenation processing procedure;
Fig. 2 is the semicircular method schematic diagram of frame number relatively again;
Fig. 3 is the schematic diagram of method of the present invention;
Fig. 4 is the flow chart of method of the present invention.
Embodiment
Among the present invention, in the multiple frame number of the minimum of asking for each physical channel, not simply to carry out subtraction relatively to obtain difference and determine according to the multiple frame number of two passages, judge the multiple frame number of current minimum but will combine, also will produce time-delay and exceed alarm if difference exceeds reference time delay according to the reference time delay of the current support of described difference and system.
Promptly, core of the present invention is to have proposed the method that a kind of time-delay grade of supporting based on system is relatively determined the minimum multiple frame number of interchannel in the virtual cascade group, make obtaining of minimum multiple frame number to combine closely with the time-delay grade of current system support, the multiple frame number of the minimum that assurance is obtained is closing to reality more, and it is more accurate to make time-delay exceed the generation of alarm.
The specific implementation of method of the present invention may further comprise the steps as shown in Figure 3 and Figure 4:
Step 41:, in the time of need obtaining the multiple frame number of the minimum of the multi-frame correspondence in each physical channel, obtain the differences of two multiple frame numbers in the virtual cascade group when at a time;
Step 42: determine two delay values between multi-frame according to described difference, promptly described difference is converted to delay value between corresponding two multi-frames according to the time of transmitting frame data, for example, the difference of two multiple frame numbers is 100, the time that transmitting frame data needs is that 125us{ITU-T (International Telecommunications Union) regulation is for any level other STM (synchronous transmission piece) grade, frame frequency was 8000 frame/seconds, just frame length or frame period are constant 125us}, then the delay value between two multi-frames is 125 to multiply by 100, is 12.5ms;
Step 43: determine two sizes between multi-frame according to the delay value between the time-delay grade of system's support and two multi-frames, and obtain minimum multiple frame number in the virtual cascade group;
The effect of this step comprises two aspects, be to determine whether the time-delay between two multi-frames exceeds the time-delay grade that system supports on the one hand, and the generation time-delay exceeds alarm when exceeding, be the size of determining the multiple frame number of two multi-frame correspondences according to the time-delay between two multi-frames on the other hand, and and the like, finally determine the size of multiple frame number of the multi-frame correspondence of a plurality of physical channels that virtual cascade group comprises, to obtain minimum multiple frame number, be used for realizing the time-delay alignment function based on the multi-frame of the multiple frame number corresponding physical passage of this minimum;
Step 431: time-delay grade and the multiple frame number of the maximum in the virtual cascade group according to system's support are determined corresponding work district, detection zone and three zones of confusion region, described three zones are three time ranges, and the time-delay grade of described system support is the maximum delay duration that system supports;
Determine total duration of service area, detection zone and confusion region, the multiple frame number of maximum that total duration equals in the virtual cascade group is on duty to transmit the needed time of a frame, the multiple frame number of described maximum is meant the maximum loop counter value of the multi-frame of each physical channel in the virtual cascade group, for example, multiple frame number from 0 to 4095 cycle count of each physical channel in virtual cascade group VC-3-XV, then maximum multiple frame number is 4096; Afterwards, the time range value of described service area is the time period of the 0 time-delay grade of supporting to system, the maximum delay duration of supposing the system support is 100ms, then the service area scope is 0 to 100ms scope, the time range value of described confusion region is that total duration deducts the time period of described time-delay grade to total duration, suppose that trizonal total duration is 500ms, then the scope of confusion region is 400 to 500ms scope, all the other time periods are detection zone, with reference to aforementioned hypothesis, the scope of detection zone is 100 to 400ms scope;
Usually the action need of step 431 was finished before step 41, described this step herein just for the ease of the understanding to whole technical proposal, did not limit the ordinal position of step 431 in the entire process flow process;
Step 432: the residing zone of delay value between determining step 42 described two multi-frames, if be in service area or confusion region, then described time-delay does not exceed the maximum delay duration that system supports, at this moment, determine the size of the multiple frame number of two multi-frame correspondences according to residing corresponding zone, if be in detection zone, then described time-delay exceeds the maximum delay duration that system supports, need to produce Delayed Alarm information, and report this information;
Describedly determine that according to the residing zone of delay value between two multi-frames the size of the multiple frame number of two multi-frame correspondences is specially: if be in the service area, then the multiple frame number of the multi-frame that multiple frame number absolute value is little in two multi-frames is less; If be in confusion region, then the multiple frame number of the multi-frame that multiple frame number absolute value is big in two multi-frames is less;
Step 433: determine multiple frame number minimum in the virtual cascade group according to the multiple frame number comparative result of per two multi-frame correspondences;
Virtual cascade group will comprise the multi-frame of a plurality of physical channels usually, need from a plurality of multi-frames, determine the multi-frame of multiple frame number minimum, then need carry out the comparison of multiple frame number size, till finally obtaining minimum multiple frame number at per two multi-frames execution in step 41,42,432 successively and step 433.
The present invention is further illustrated with a concrete application example more below:
With the virtual cascade group VC-3-XV in the SDH system is example, the time that transmitting frame data needs is 125us, the time that then transmitting 4096 frame data needs is 512ms (being total duration in described three districts), and the reference time delay of supposing the support of current system simultaneously is 1024 frames, i.e. 128ms.
Three zones that needs are used when determining that according to above-mentioned hypothesis obtaining minimum answers frame number are respectively: the service area is the time range of 0-128ms, duration 128ms, detection zone is the time range of 128-384ms, duration 256ms, confusion region is the time range of 384-512ms, duration 128ms, as shown in Figure 3.
At a time, when relatively judging multiple frame number big or small of two physical channels in the virtual cascade group if desired, then get the multiple frame number of any two physical channels in the virtual cascade group, and calculate the differences of two multiple frame numbers.When the difference of two multiple frame numbers is arranged in detection zone shown in Figure 3, be that described difference is during greater than 128ms and less than 384ms, then produce reference time delay and exceed alarm, illustrate that the multiple frame number of two passages can't compare size this moment, that is to say may be because serious latency issue have taken place in the route of a certain specific channel of network, causes the registration process of delaying time that system can not be correct.When the difference of two multiple frame numbers was positioned at the service area, when promptly described difference was less than or equal to 128ms, then system was in normal reference time delay at present, did not produce the delay inequality scope and exceeded alarm, and determine that the little multiple frame number of absolute value is less multiple frame number this moment.When the differences of two multiple frame numbers are positioned at confusion region, during promptly greater than 384ms, system does not produce the delay inequality scope yet and exceeds alarm, determines that the big multiple frame number of absolute value is less multiple frame number this moment.And the like, for the multiple frame number of other each physical channels in the virtual cascade group more also adopt said method, to the last in the multiple frame number of each physical channel, determine till the minimum multiple frame number.
Further hypothesis has the multiple frame number of two physical channels to be respectively A and B now, and the absolute value of A is greater than the absolute value of B, at first deduct multiple frame number B and obtain a difference AB with multiple frame number A, then, judge the zone at AB place, if AB is at detection zone, illustrate that then these two delay inequalities between the multiple frame number have surpassed the scope that system allows, then A and B can't compare size, need to produce time-delay and exceed alarm, otherwise illustrate that two time-delays between multi-frame are within reference time delay, at this moment, if AB is in the service area, then can determine it is that the big B of A is little,, AB can determine it is that the little B of A is big if being in confusion region.Like this, just can obtain multiple frame number less in two physical channels.
The technical scheme of describing from foregoing invention as can be seen, among the present invention, the multiple frame number of two from 0～4095 circulation relatively size is with the time-delay rank correlation of system support, make and to produce comparatively closing to reality of the multiple frame number of the minimum of relatively coming out corresponding time-delay exactly simultaneously and exceed alarm.
The above; only be the preferable embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement; the variation of the ordinal position of step 431 in carrying out flow process etc. as described therein all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (6)
1. the method that reed is got minimum multiple frame number in the virtual cascade group in the Virtual Concatenation processing procedure is characterized in that comprising:
A, obtain in the virtual cascade group differences of two multiple frame numbers, and determine the delay value between two multi-frames;
B, judge the residing district of delay value between described two multi-frames, if be in the service area, then the multiple frame number of the multi-frame that multiple frame number absolute value is little in two multi-frames is less; If be in confusion region, then the multiple frame number of the multi-frame that multiple frame number absolute value is big in two multi-frames is less; Determine multiple frame number minimum in the described virtual cascade group according to the multiple frame number comparative result of per two multi-frame correspondences;
The time range value of described service area is the time period of the 0 time-delay grade that allows to system, the time range value of described confusion region is that total duration deducts the time period of described time-delay grade to total duration, and the multiple frame number of maximum that described total duration equals in the virtual cascade group is on duty to transmit the needed time of a frame.
2. obtain the method for minimum multiple frame number in the virtual cascade group in the Virtual Concatenation processing procedure according to claim 1, it is characterized in that described step B also comprises:
If the residing district of delay value between described two multi-frames is a detection zone, then can't determine less multiple frame number, and produce Delayed Alarm that described detection zone is all the other time periods except service area, confusion region in total duration scope.
3. obtain the method for minimum multiple frame number in the virtual cascade group in the Virtual Concatenation processing procedure according to claim 1, it is characterized in that described steps A comprises:
Obtain the difference of two multiple frame numbers in the virtual cascade group;
Described difference is converted to delay value between corresponding two multi-frames according to the time of transmitting frame data.
4. obtain the method for minimum multiple frame number in the virtual cascade group in the Virtual Concatenation processing procedure according to claim 1, it is characterized in that also comprising in this method:
Time-delay grade and the multiple frame number of the maximum in the virtual cascade group according to system's support are determined corresponding work district, detection zone and three zones of confusion region.
5. according to the method for obtaining minimum multiple frame number in the virtual cascade group in claim 1 or 2 or the 3 or 4 described Virtual Concatenation processing procedures, it is characterized in that described steps A comprises:
In Synchronous Digital Hierarchy SDH system, obtain the difference of the multiple frame number that need carry out multiple frame number size two multi-frames relatively, and multiply by the frame period 125us that the ITU-T of International Telecommunications Union stipulates with this difference, obtain the delay value between two multi-frames.
6. obtain the method for minimum multiple frame number in the virtual cascade group in the Virtual Concatenation processing procedure according to claim 5, it is characterized in that this method also comprises:
Determine that the time that transmission 4096 frames need in the SDH system is 512ms;
Determine the maximum delay value of permission according to the time-delay grade of system's support, and described 512ms is divided into three zones: service area, detection zone and confusion region according to described maximum delay value, described service area is 0 time range to the maximum delay value, described detection zone is the time range of maximum delay value to " 512ms deducts the maximum delay value ", and described confusion region is " 512ms the deducts the maximum delay value " time range to 512ms.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101210738A CN100464544C (en) | 2003-12-24 | 2003-12-24 | Method for obtaining minimum multiframe number in virtual cascade group during virtual cascade processing |
| PCT/CN2004/001495 WO2005062526A1 (en) | 2003-12-24 | 2004-12-22 | The method for obtaining the minimum multiframe number in the virtual concatenation group during the procedure of virtual concatenation process |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101210738A CN100464544C (en) | 2003-12-24 | 2003-12-24 | Method for obtaining minimum multiframe number in virtual cascade group during virtual cascade processing |
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| CN1633118A CN1633118A (en) | 2005-06-29 |
| CN100464544C true CN100464544C (en) | 2009-02-25 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100440770C (en) * | 2005-07-22 | 2008-12-03 | 中兴通讯股份有限公司 | Method for backward transmitting virtual cascade group far end flaw indication |
| CN1983892B (en) * | 2006-04-12 | 2011-07-06 | 华为技术有限公司 | Method and device for processing fault-tolerant frame-duplicating serial number |
| CN101141210B (en) * | 2007-01-15 | 2010-12-08 | 中兴通讯股份有限公司 | Method of determining the longest member of path time delay in virtual concatenation group |
| CN101621344B (en) * | 2008-06-30 | 2011-12-28 | 华为技术有限公司 | Method for determining virtual concatenation alignment out-of-limit and device for processing communication services |
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| CN1224290A (en) * | 1997-09-05 | 1999-07-28 | Gpt有限公司 | Data transmission in SDH network |
| CN1354927A (en) * | 1999-06-10 | 2002-06-19 | 奥地利西门子股份有限公司 | Method and device for converting virtually concatenated data streams into contiguously concatenated data streams |
| US20030095563A1 (en) * | 2001-08-30 | 2003-05-22 | Pmc-Sierra, Inc. | Differential delay compensation |
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2003
- 2003-12-24 CN CNB2003101210738A patent/CN100464544C/en not_active Expired - Lifetime
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2004
- 2004-12-22 WO PCT/CN2004/001495 patent/WO2005062526A1/en active Application Filing
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| CN1224290A (en) * | 1997-09-05 | 1999-07-28 | Gpt有限公司 | Data transmission in SDH network |
| CN1354927A (en) * | 1999-06-10 | 2002-06-19 | 奥地利西门子股份有限公司 | Method and device for converting virtually concatenated data streams into contiguously concatenated data streams |
| US20030095563A1 (en) * | 2001-08-30 | 2003-05-22 | Pmc-Sierra, Inc. | Differential delay compensation |
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| CN1633118A (en) | 2005-06-29 |
| WO2005062526A1 (en) | 2005-07-07 |
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