CN101374030A - Synchronizing system and method for virtual cascade of light transportation network - Google Patents
Synchronizing system and method for virtual cascade of light transportation network Download PDFInfo
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Abstract
The invention discloses a virtual concatenation synchronization system in an optical transport network (OTN) and a method thereof, belonging to the field of optical communications. The system comprises a synchronization unit, a virtual concatenation delay compensation unit, an asynchronous demapping unit, a smooth service acquisition unit, and a service data recovery unit. The method comprises the steps of carrying out virtual concatenation delay compensation by using fixed-point floatation of an optical channel payload unit (OPUk), and recovering service data by combining asynchronous demapping during synchronization process. The technical proposal provided in the invention can effectively inhibit jitter due to synchronization and virtual concatenation delay compensation, thereby solving the deterioration problem of clock jitter performance arising from transport of constant bit rate services via virtual concatenation in the OTN.
Description
Technical field
The present invention relates to optical communication field, the Virtual Concatenation synchro system and the method for (OTN, Optical Transport Network) in particularly a kind of optical transfer network.
Background technology
Along with the commercialization gradually of OTN equipment, utilize the demand that OTN equipment carries big bandwidth also to get more and more.Utilize the Virtual Concatenation technology of OTN can realize that OTN equipment carries big band width service, such as STM-64,10G Ethernet, 40G POS etc.The Virtual Concatenation technology of OTN transmits the particle that the business of big bandwidth is divided into some network supports respectively, only need support the processing of big bandwidth to get final product sending and receive two ends.
As shown in Figure 1, be the structure of OTN Virtual Concatenation.If client signal is loaded (wherein, k=1,2,3, the speed rank of difference corresponding 2.5G, 10G, 40G with X OPUk (Optical Channel PayloadUnit, optical channel Payload Unit); X=1 ..., 256), then its used Virtual Concatenation container is used OPUk-Xv (k=1,2,3; X=1 ..., 256) represent.The frame structure of OPUk-Xv is a block frame structure of byte with 4 row 3810X row, is made of OPUk-Xv overhead area (OH) and payload section (Payload).
At transmit leg, client data through sealing, mapping, framing, send to the recipient.The payload of OPUk-Xv is mapped among X the OPUk, and each OPUk is transmission in an ODUk (Optical Channel Data Unit, Optical Channel Data Unit-k), and X ODUk just formed ODUk-Xv.
At receive direction, OTN passes through and separates frame, separates mapping and recovers customer data.Because OTN is an asynchronous system, the basic container OTUk of Virtual Concatenation (Optical Channel Transport Unit-k, optical channel transmission unit) be asynchronous between, single container OPUk passes through in the OTN net with the form of OTUk, OTUk needs to carry out asynchronous mapping/the separate process of mapping at each network element, OTUk from each network element has speed and phase difference, thereby, at first need asynchronous OTUk container is synchronized on the system clock territory at receive direction.In addition, because each ODUk among ODUk-Xv transmits separately in network, different ODUk has different time delays during by Network Transmission, therefore between the ODUk delay inequality is arranged when termination, and then produce delay inequality between OPUk.This delay inequality must compensate, thereby need carry out Virtual Concatenation delay compensation alignment, separates mapping and recovers customer data by asynchronous more at last.
Fixed bit rate (CBR) signal (STM-64, STM-256) can be mapped among OPUk-4v according to asynchronous system.The frame structure of OPUk-4v as shown in Figure 2.OPUk-4v payload section is made of 4 * 4 * 3808 bytes.Every row comprises 1 positive adjustment chance byte (PJO), 1 NJO byte and 3 JC bytes. wherein, and the 7th and the 8th NJO and PJO that is used for controlling this row of JC.Because the capacity of OPUk-4v payload section is 4 times of OPUk, so the 10Gbit/s signal can pack among OPU1-4v, and the signal of 40Gbit/s can be packed among OPU2-4v.In the process of packing into, each provisional capital can do a byte just/negative justification; In OPUk-4v frame, can do 4 times totally 4 bytes just/negative justification.
With STM-64over OTU1-4V is example, and at sending direction, the mapping path of OTN Virtual Concatenation standard is as follows:
STM-64→OPU1-4v→4×OPU1→4×ODU1→4×OTU1。
As shown in Figure 3, provide the asynchronous Virtual Concatenation delay compensation of a kind of OTN/the separate scheme of mapping in the prior art 1.At receive direction, synchronization fifo (First In First Out, first in first out) the clock that writes is separately OTU1 clock, the clock of reading of synchronization fifo is the OTU1 system clock, utilize this clock from FIFO, to read OPU1, this system clock is chosen from 4 branch roads that receive, and FIFO only is the clock zone buffer action, thereby 4 tunnel OTU1 is synchronized on the clock.Virtual Concatenation delay compensation read control section by Fig. 2 framing, the OPU1-4V structure of output alignment is separated the mapping part and recover STM-64 from OPU1-4V.
This scheme directly chooses one the tunnel as system clock from 4 road OTU1 clocks, 4 road OTU1 clocks are had higher requirement, requires 4 road OTU1 clocks for together frequently.If 4 road OTU1 clocks have frequency difference, then fix owing to the position of OPU1 in OTU1, when the using system clock is synchronous to the OPU1 container, can't guarantee the fixed position of this OPU1 in OTU1, the OTN frame structure of after Virtual Concatenation delay compensation, can not regenerating, thus immeasurablel at random shake introduced.Asynchronously separate mapping and more can't effectively leak control to this part shake, this is especially unfavorable for the business of shake index request strictness such as STM64 etc.
If said system is the system of virtual cascade group more than, such as being a system that receives 8 road OTU1 altogether, but this 8 the tunnel belongs to two different virtual cascade group, wherein per four is virtual cascade group from same source node, if select a road in a group in two groups so, also need under this application scenarios to handle in synchronizing process and give the professional problem of introducing shake as synchronised clock.And in case serious clock deterioration appears in selected path, another group virtual cascade group will also be affected, and in this system, this scheme is inadvisable especially.
As shown in Figure 4, be the asynchronous Virtual Concatenation delay compensation of the 2 another kind of OTN that provide in the prior art/the separate scheme of mapping.In this scheme, the reading clock and can or from local clock, choose from 4 branch roads that receive of synchronization fifo.
When the OTU1 system clock is selected from road clock in 4 branch roads, also can produce problem same in the prior art 1.
When the OTU1 system clock is selected from local clock, because the OTU1 clock of 4 branch roads of OTU1 system clock and reception is different frequently, though therefore writing FIFO is OTU1, that read from FIFO is OPU1, but the position of the OPU1 that reads from FIFO in OTU1 is unfixing, be that interval between OPU1 frame and the frame is fixing, i.e. the broken ring of OTU1 frame structure.Virtual Concatenation delay compensation unit is to 4 road OPU1 registration process, but OPU1-4V frame and the interval between the frame after the alignment are at random equally, be equivalent to offer the asynchronous map unit breach tracking clock at random of separating, be unfavorable for recovering the clock that the shake index meets the requirements.Thereby, though this programme can be synchronized to the OTU1 of branch road on the system clock, the jitter amplitude immeasurability that synchronism link is introduced, the asynchronous map unit of separating can't be carried out effective filtering, final deterioration outgoing traffic clock quality.
Summary of the invention
Recover level and smooth business datum in order to make when the OTN Virtual Concatenation is asynchronous separates mapping, the embodiment of the invention provides Virtual Concatenation synchro system and the method in a kind of optical transfer network.Described technical scheme is as follows:
Virtual Concatenation synchro system in a kind of optical transfer network, described system comprises:
Lock unit, being used for that each branch road optical channel transmission unit is carried out clock synchronization handles, produce synchronically controlling information, the synchronically controlling information of each branch road is carried out the pointer adjustment, produces synchronous optical channel Payload Unit and breach clock accordingly thereof according to the FIFO waterline;
Virtual Concatenation delay compensation unit, be used for the described synchronous optical channel Payload Unit of all branch roads is carried out Virtual Concatenation delay compensation, obtain the optical channel Payload Unit Virtual Concatenation container and the corresponding breach clock thereof of alignment according to the synchronous optical channel Payload Unit of described each branch road and corresponding breach clock thereof;
The asynchronous map unit of separating, be used for extracting professional payload, obtain the positive and negative adjustment information and the optical channel Payload Unit pointer adjustment information of mapping respectively according to the optical channel Payload Unit Virtual Concatenation container and the corresponding breach clock thereof of described alignment from the optical channel Payload Unit Virtual Concatenation container of described alignment;
Level and smooth professional acquiring unit, be used for selecting the equally distributed scheduling pattern of breach, from described professional payload, obtain level and smooth professional payload according to the equally distributed scheduling pattern of described breach according to the positive and negative adjustment information and the optical channel Payload Unit pointer adjustment information of described mapping;
The business datum recovery unit is used for obtaining data clock by following the tracks of the equally distributed scheduling pattern of described breach, and utilizes described data clock to recover business datum from described level and smooth professional payload.
The embodiment of the invention also provides the method for synchronous of the Virtual Concatenation in a kind of optical transfer network, said method comprising the steps of:
Each branch road optical channel transmission unit is carried out clock synchronization handle, produce synchronically controlling information, the synchronically controlling information of each branch road is carried out the pointer adjustment, produces synchronous optical channel Payload Unit and breach clock accordingly thereof according to the FIFO waterline;
Described synchronous optical channel Payload Unit to all branch roads carries out Virtual Concatenation delay compensation, obtain the optical channel Payload Unit Virtual Concatenation container of alignment according to the synchronous optical channel Payload Unit of described each branch road and corresponding breach clock thereof, obtain the corresponding breach clock of described optical channel Payload Unit Virtual Concatenation container according to the corresponding breach clock of the synchronous optical channel Payload Unit of described each branch road;
From the optical channel Payload Unit Virtual Concatenation container of described alignment, extract professional payload, obtain the positive and negative adjustment information and the optical channel Payload Unit pointer adjustment information of mapping respectively according to the optical channel Payload Unit Virtual Concatenation container and the corresponding breach clock thereof of described alignment;
Positive and negative adjustment information and optical channel Payload Unit pointer adjustment information according to described mapping are selected the equally distributed scheduling pattern of breach, obtain level and smooth professional payload according to the equally distributed scheduling pattern of described breach from described professional payload;
Follow the tracks of the equally distributed scheduling pattern of described breach and obtain data clock, and utilize described data clock from described level and smooth professional payload, to recover business datum.
The described technical scheme of the embodiment of the invention is floated by the OPUk fixed point that adopts synchronizing process and the framing again of Virtual Concatenation delay compensation, separate the shake that mapping has suppressed synchronously effectively and mapping is introduced in conjunction with asynchronous again, has solved fixed bit rate and has transmitted the clock jitter index deterioration problem of bringing through the OTN Virtual Concatenation.
Description of drawings
Fig. 1 is an OPU-Xv structure chart in the prior art;
Fig. 2 is CBR10G/CBR40G mapping structure figure in the prior art;
Fig. 3 is that OTN reaches Virtual Concatenation delay compensation/asynchronous structure chart of separating mapping synchronously in the prior art 1;
Fig. 4 is that OTN reaches Virtual Concatenation delay compensation/asynchronous structure chart of separating mapping synchronously in the prior art 2;
Fig. 5 is the embodiment of the invention 1 described OTN Virtual Concatenation synchronous system architecture figure;
Fig. 6 is the unsteady schematic diagram of the embodiment of the invention 1 described OPUk fixed point;
Fig. 7 is the structure chart of the embodiment of the invention 1 described lock unit;
Fig. 8 is the embodiment of the invention 1 described Virtual Concatenation delay compensation cellular construction figure;
Fig. 9 is the embodiment of the invention 1 a described level and smooth professional acquiring unit schematic diagram;
Figure 10 is the embodiment of the invention 2 described OTN Virtual Concatenation method for synchronous flow charts.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described in further detail below in conjunction with accompanying drawing.
In single Virtual Concatenation or many virtual cascade group receiving system, using system clock synchronization and all virtual cascading members of Virtual Concatenation delay compensation, the committed step of OTN Virtual Concatenation receive direction is synchronous and Virtual Concatenation delay compensation.The embodiment of the invention is fixed a point to float with the framing again of Virtual Concatenation delay compensation, is separated the effective inhibition of the mapping shake of introducing synchronously in conjunction with asynchronous again by the OPUk of synchronizing process, thereby solves the clock jitter index deterioration problem that fixed bit rate (CBR) brings through the transmission of OTN Virtual Concatenation.
The embodiment of the invention is an example with the asynchronous mapping of STM-64 to 4 * OTU1/separate mapping process, and the synchro system and the method for OTN Virtual Concatenation is described, other similarly, repeat no more as STM-256OTN Virtual Concatenation synchro system and method.
As shown in Figure 5, the embodiment of the invention provides a kind of OTN Virtual Concatenation synchro system.This system comprises 5 unit, is respectively lock unit, Virtual Concatenation delay compensation unit, asynchronous map unit, level and smooth professional acquiring unit and the business datum recovery unit separated.Respectively each unit is specifically described below.
1, lock unit
Lock unit is finished the clock synchronization of 4 road OTU1 and is handled, produce synchronically controlling information, according to the FIFO waterline synchronically controlling information of each branch road is carried out the pointer adjustment, produce the corresponding breach clock of the synchronous optical channel Payload Unit of synchronous optical channel Payload Unit and this branch road.
Owing to the otherness of synchronous back system clock and branch clock, the position of OPU1 in OTU1 after is unfixed synchronously in the prior art, and this fixing meeting is to the professional shake of introducing high amplitude of output client.Therefore wish that the difference between the OPU1 that floats and the fixing OPU1 is measurable, follow-uply let out, reach and optimize the professional purpose of shaking index of client to the shake of sync section with high amplitude with convenient.Lock unit adopts the mode that fixed point is floated in the embodiment of the invention, floats at the fixed area permission OPU of OTU1.
As shown in Figure 6, the 1st row, the 14th byte of definition OTU1 are OPU1 negative justification position; Define the 1st row, the 15th byte be OPU1 positive justification position.In implementation process, the byte that also can select other positions is the positive and negative adjustment of OPU1 position, so long as the OTU spare bits just can, be not limited to the positive negative justification location definition method of present embodiment.
By above-mentioned definition, the OPU1 frequency departure range computation that this OPU1 zone can hold is as follows:
OPU1 speed=2.48832Gbps;
Flank speed=2.48832Gbps * 15233/15232=2.488483Gbps;
Minimum speed limit=2.48832Gbps * 15231/15232=2.4881566Gbps;
Adjusting range 2.4881566～2.488483Gbps;
Be converted to ppm:-65.65ppm～65.65ppm;
Promptly this structure can be held and receives OPU1 and fluctuate between-65.65ppm～65.65ppm.
As shown in Figure 7, be the structural representation of lock unit.Lock unit comprises four the tunnel, and each branch road comprises synchronous subelement, the unsteady control sub unit of waterline detection sub-unit and fixed point.Wherein, subelement comprises that again OPU1 writes control sub unit and OPU1FIFO synchronously, is used for that each branch road optical channel transmission unit is carried out clock synchronization and handles, and produces synchronous optical channel Payload Unit.As shown in Figure 7, the concrete structure of lock unit is as follows:
Subelement is used for each branch road optical channel transmission unit is carried out the clock synchronization processing synchronously, produces synchronically controlling information.Wherein, OPU1 writes control sub unit and receives OTU1, therefrom extracts and obtains OPU1, and OPU1 is write OPU1FIFO, writes the OTU1 clock that clock receives for each passage.OPU1FIFO receives OPU1, carries out the isolation of clock zone.
The waterline detection sub-unit is used to detect the waterline of each branch road FIFO, and testing result is sent to the unsteady control sub unit of corresponding fixed point.
The unsteady control sub unit of fixed point is used in the fixed position of optical channel transmission unit positive justification position and negative justification position being set, and on positive negative justification position the synchronically controlling information of synchronous subelement generation is carried out the pointer adjustment according to the testing result of waterline detection sub-unit.The control of reading that the unsteady control sub unit of fixed point produces is input to OPU1FIFO as reading control.Whether OPU1 reads to control the mode that adopts fixed point to float, read to be controlled at fixing position (i.e. Ding Yi positive and negative adjustment position) and float according to FIFO waterline decision OPU1, carries out the adjustment of read-out speed.Specifically, the unsteady control sub unit of fixed point is adjusted according to the result who detects, and is higher than high waterline as the FIFO waterline, and promptly the writing rate of OPU1FIFO is greater than the speed of reading, then the unsteady control sub unit of fixed point is used negative justification OPU1 float area, to improve read-out speed; Be lower than low waterline as the FIFO waterline, promptly the writing rate of OPU1FIFO then uses positive justification OPU1 float area less than the speed of reading, to reduce read-out speed; Between the height waterline, then OPU1 does not float as the FIFO waterline.
Above-mentionedly read control and can be equivalent to the breach clock by what fixed point floated that control sub unit produces, breach clock 1_1, breach clock 1_2, breach clock 1_3 and breach clock 1_4 are respectively each branch road has been deducted expense and filling information synchronously results, and this breach clock is as the clock that writes of Virtual Concatenation delay compensation unit.
OPU1 adopts same clock from the readout clock of OPU1FIFO and the clock that writes of the unsteady control sub unit of fixed point, and the source of this clock can be to choose or local clock from each branch road.The OPU1 of OPU1FIFO output outputs to next stage Virtual Concatenation delay compensation unit by the unsteady control sub unit of fixing a point.
2, Virtual Concatenation delay compensation unit
Virtual Concatenation is handled in the prior art only the frame alignment function, is alignment after promptly the slowest member arrives in virtual cascade group, can go out number to the homogeneous frame.The shortcoming of this mode be alignment back dateout flow at random, situation about can't transparent transmission synchronizing process pointer adjusting.In the present embodiment, the output of Virtual Concatenation buffer memory has increased and has become frame unit again, and Virtual Concatenation delay compensation unit is finished outside the alignment function except 4 OPU1 are carried out Virtual Concatenation delay compensation, the OPU1 pointer adjustment information of can also the transparent transmission synchronizing process introducing.
In the present embodiment, Virtual Concatenation delay compensation unit is used for the synchronous optical channel Payload Unit of all branch roads is carried out Virtual Concatenation delay compensation, optical channel Payload Unit Virtual Concatenation container and the corresponding breach clock 2 of this optical channel Payload Unit Virtual Concatenation container that optical channel Payload Unit that each branch road that produces according to lock unit is synchronous and corresponding breach clock thereof obtain alignment.
As shown in Figure 8, Virtual Concatenation delay compensation unit comprises 4 Virtual Concatenation delay compensation buffer memorys 1,2,3 and 4, and recognin unit, slow channel and Virtual Concatenation be the framing subelement again.
4 road OPU1 that Virtual Concatenation delay compensation buffer memory 1,2,3 and 4 is used to receive and buffer memory sends over from lock unit, this 4 road OPU1 utilizes breach clock 1_1,1_2,1_3 and 1_4 to write respectively, and then sends to Virtual Concatenation framing subelement again.
The multiple frame number information of input input and breach clock 1_1,1_2,1_3 and the 1_4 of recognin unit, slow channel, the corresponding breach clock of channel number of optical channel Payload Unit of choosing a slowest branch road according to multiple frame number information is as the control of reading of Virtual Concatenation delay compensation buffer memory.Slow channel choosing method can be realized according to the multiple frame number judgement of minimum.The multiple frame number of 4 branch roads compares, and gets minimum and can obtain minimum multiple frame number, and the channel number of the multiple frame number correspondence of current minimum is exactly slow channel.The breach clock of this slow channel correspondence is a breach clock 2, owing to be according to a slowest branch road reading, the data that can guarantee the corresponding multi-frame of other branch roads in the virtual cascade group arrive, and promptly other branch roads have data to provide, and other branch roads can not occur and read empty situation.Because the Virtual Concatenation member is a homology, in the long run, the frequency of the positive and negative pointer adjustment of aforementioned synchronizing process is identical, the difference of short-term is then by Virtual Concatenation delay compensation buffer memory buffering, so, can not cause other branch road buffer memorys to overflow with breach clock unification reading from Virtual Concatenation delay compensation buffer memory of slow branch road.The breach clock of choosing simultaneously 2 comprises the OPU1 pointer adjustment information that aforementioned synchronizing process is introduced, and this pointer adjustment information comes down to because the not shake of homology introducing of sourcesink clock needs to handle by follow-up level and smooth professional acquiring unit.
Virtual Concatenation framing subelement again receives Virtual Concatenation delay compensation buffer memory 1,2,3 and 44 road OPU1 that send, simultaneously, breach clock 2 be input to Virtual Concatenation again the framing subelement as reading to control the OPU1-4v that obtains alignment.
The OPU1-4v of the alignment that Virtual Concatenation delay compensation unit produces is input to the asynchronous map unit of separating, and breach clock 2 is as the asynchronous clock that writes of separating map unit.
3, the asynchronous map unit of separating
As shown in Figure 5, asynchronous separate map unit comprise separate the mapping subelement and the statistics subelement.
Separate the realization of mapping subelement and from the OPU1-4V of the alignment of Virtual Concatenation delay compensation unit output, extract the professional payload of STM-64, be input to the level and smooth subelement in the level and smooth professional acquiring unit; Control information, the filling information filled in during by deletion expense and asynchronous mapping generate breach clock 3, are input to the level and smooth subelement in the level and smooth professional acquiring unit, and this breach clock 3 has reflected STM-64 payload speed.Separate the mapping subelement and also the OPU1-4V of breach clock 2 and alignment is input to the statistics subelement.In actual applications, also can adopt the statistics subelement directly from Virtual Concatenation delay compensation unit, to obtain the scheme of the OPU1-4V of breach clock 2 and alignment.
The transmission in the OTN net of client's business has a plurality of links and brings shake, and client's business is mapped into OPUk-xV need carry out justification, and this process can be introduced Mapping jitter.In addition, because the asynchronous behavior of OTN, between the Virtual Concatenation member clock of destination node, there is not synchronized relation from different network elements, need carry out synchronizing process, synchronously also can bring the shake damage during Virtual Concatenation member to business, this shake is similar to the pointer adjustment shake of SDH (Synchronous Digital Hierarchy, synchronous digital hierarchy) network, and pointer adjustment shake is also referred to as in conjunction with shake.Mapping jitter and combination shake all need to give to handle at the destination node of OTN network, to guarantee client's performance of services.
In order to achieve the above object, the statistics subelement can be discerned OPU1 pointer adjustment information according to the difference of breach clock 2 and standard OPU1 clock, positive and negative adjustment information during according to OPU1-4v identification asynchronous mapping, and the chock smotthing subelement that the OPU1 pointer adjustment information obtained and positive and negative adjustment information offer in the level and smooth professional acquiring unit used.
4, level and smooth professional acquiring unit
Level and smooth professional acquiring unit is realized carrying out smoothly shining upon/separate the clock breach that mapping process, synchronizing process cause, promptly according to the positive and negative adjustment information and the equally distributed scheduling pattern of optical channel Payload Unit pointer adjustment information selection breach of described mapping.And according to the equally distributed scheduling pattern of resulting breach from asynchronous professional payload that map unit the sends sliding professional payload of making even obtaining of separating.As shown in Figure 9, level and smooth professional acquiring unit comprises level and smooth subelement and chock smotthing subelement.
The effect of chock smotthing subelement is a customization scheduling pattern, promptly generates the equally distributed scheduling pattern of breach (being breach clock 4).The selection foundation of scheduling pattern is the positive and negative adjustment information of asynchronous mapping and the OPU1 pointer adjustment information of synchronizing process.
The scheduling pattern computational methods of traffic smoothing are as follows: suppose to use 3 scheduling pattern MapA, MapB and MapC, corresponding respectively positive justification, negative justification and do not adjust, if the probability of use of MapA is P1, the probability of use of MapB is P2, then the probability of use of MapC is 1-P1-P2, and then following formula is set up:
V＝SysFreq×[MapA×P1+MapB×P2+MapC×(1-P1-P2)]×Width
The V:STM-64 service rate;
The SysFreq:OTU1 system clock;
The probability of use of P1:MapA;
The probability of use of P2:MapB;
Width: the bit wide of level and smooth FIFO.
To the OPU1-4V mapping, the scheduling pattern can be designed as for STM-64: MapA=(255,237) (represent 255 clock cycle, 237 effectively), MapB=(255,239), MapC=(255,238).
As shown in Figure 9, the chock smotthing subelement comprises the addition subelement, and leak rate control sub unit and pattern are selected control sub unit.
The addition subelement is with the positive and negative adjustment information and the addition of optical channel Payload Unit pointer adjustment information of described mapping, promptly obtain being used for the leakage value of selection scheduling pattern, and this leakage value is sent to the leak rate control sub unit by positive and negative adjusted value of asynchronous mapping and OPU1 pointer adjusted value sum.
The leak rate control sub unit can be carried out the leakage of bit-level by the leak rate control algolithm to leakage value, the leak rate of control leakage value, the shake of low frequency high amplitude is expanded to the shake of high frequency short arc, will send to pattern through the leakage value after the leak rate control and select control sub unit.Pattern selects control sub unit to be used for the leakage value selection scheduling pattern that sends according to the leak rate control sub unit, and for just, and absolute value is then selected MapA more than or equal to a leakage unit (being the bit wide of FIFO) as this leakage value; As this leakage value is negative, and absolute value is then selected MapB more than or equal to a leakage unit; Leak unit as this leakage value absolute value less than one, then select MapC, and selected scheduling pattern is stamped uniform breach, the uniform clock of the breach of this selection is a breach clock 4.Breach clock 4 is input to trace cache subelement and the clock tracing phase-locked loop (PLL) in the business datum recovery unit.
In the practical application, also can not take scheme with above-mentioned positive and negative adjustment information and the addition of optical channel Payload Unit pointer adjustment information, select control sub unit and take to send to respectively back one-level leak rate control unit and pattern, select control sub unit to select the equally distributed scheduling pattern of breach by pattern, thereby obtain business clock and recover business datum.
The effect of level and smooth subelement is will separate the payload that shines upon subelement output with breach clock 3 to write, clock is read in conduct according to the equally distributed scheduling pattern of above-mentioned breach (being breach clock 4), the professional payload read-out speed of control from level and smooth subelement, obtain level and smooth professional payload, by the control of service traffics being reduced the acceleration or the delay of phase-locked loop adjustment action, shake thereby reduce.And send this level and smooth professional payload to the business datum recovery unit.
If the payload clock jitter that the adjustment of OPU1 pointer causes is the disposable shake that discharges meeting initiation clock at a pattern selection cycle fully, here increase a low frequency filtering and handle subelement, be used for the statistics of leakage value is judged that carrying out leak rate controls, promptly pass through the interior concussion of short time of the low-pass filtering link filtering pointer of phase-locked loop, the adjustment statistics of OPU pointer is judged, a parameter as the control leak rate, the speed of releasing of steering needle adjustment can reduce the moment shake of clock.Filtered leakage value sends to pattern and selects control sub unit.Wherein the use of each positive negative justification opportunity is called once release, and the use that the result that the control strategy that the finger of releasing is adjusted obtains statistics is mild is adjusted chance and discharged.
5, business datum recovery unit
As shown in Figure 5, the business datum recovery unit is made up of trace cache subelement and clock tracing phase-locked loop (PLL).
The clock tracing phase-locked loop is used for the equally distributed scheduling pattern of track breach and obtains out data clock.This clock tracing phase-locked loop can be an analog loop, also can be digital rings.In the present embodiment, the track reference clock, promptly the object of Gen Zonging is a breach clock 4, the data clock that obtains is continuous STM-64 clock.
The trace cache subelement is used for utilizing the business clock that recovers through phase-locked loop to recover business datum from level and smooth professional payload.
As shown in figure 10, the embodiment of the invention also provides the method for synchronous of the Virtual Concatenation in a kind of optical transfer network.In the present embodiment, the mode that adopts fixed point to float, at first, two idle bytes that define OTU1 respectively are positive and negative adjustment position, for example define the 1st row of OTU1, the 14th byte is OPU1 negative justification position; Define the 1st row, the 15th byte be OPU1 positive justification position.In implementation process, the byte that also can select other positions is the positive and negative adjustment of OPU1 position, is not limited to the positive negative justification location definition method of present embodiment.This positive and negative adjustment position is relatively-stationary in the position of OTU1, so that OPU1 is floated in fixing position.
After having defined positive and negative adjustment position, carry out successively synchronously, Virtual Concatenation delay compensation, asynchronously separate mapping, level and smooth business is obtained and business datum recovery five big steps, concrete operations are as follows:
At first, at OTN Virtual Concatenation receive direction each branch road optical channel transmission unit is carried out clock synchronization and handle, according to the FIFO waterline each branch road OPU1 is carried out the pointer adjustment, produce synchronous OPU1, concrete steps are as follows:
Step 101: each branch road uses separately that the OTU1 clock writes FIFO with OPU1.
Step 102: utilize system clock as reading clock, the OPU1 of each branch road is carried out Synchronous Processing, produce synchronically controlling information; Wherein system clock adopts same clock, and the source of this clock can be to choose or local clock from each branch road.
Step 103: according to the FIFO waterline synchronically controlling information of each branch road is carried out the pointer adjustment, produce synchronous OPU1 and corresponding breach clock thereof.
Whether OPU1 reads to control the mode that adopts fixed point to float, promptly read to be controlled at the fixing position (i.e. Ding Yi positive and negative adjustment position) of OTU1 and float according to FIFO waterline decision OPU1, promptly carries out the adjustment of read-out speed.
Detect each branch road FIFO waterline, and on positive negative justification position, adjust the OPU1 float area, be higher than high waterline, then use negative justification OPU1 float area, to improve read-out speed as the FIFO waterline according to the testing result of FIFO waterline; Be lower than low waterline as the FIFO waterline, then use positive justification OPU1 float area, to reduce read-out speed; Between the height waterline, then OPU1 does not float as the FIFO waterline.
To the control of reading of OPU1FIFO, enabling of promptly reading can be equivalent to the breach clock, and 4 the tunnel are respectively breach clock 1_1, breach clock 1_2, breach clock 1_3, breach clock 1_4.Be equivalent to utilize breach clock 1_1～breach clock 1_4 to read FIFO as the OPU1 that reads to control with respective channel.
So far, finished synchronizing step, subsequent step need carry out Virtual Concatenation delay compensation with OPU1-4v to the synchronous OPU1 of all branch roads by Virtual Concatenation delay compensation, obtain the OPU1 Virtual Concatenation container of alignment according to the synchronous OPU1 of each branch road and corresponding breach clock thereof, obtain the corresponding breach clock of OPU1 Virtual Concatenation container according to the corresponding breach clock of the synchronous OPU1 of each branch road.
Step 104: the corresponding separately breach clock of reading in the step 103 of each branch road OPU1 basis is write FIFO.
Step 105: identify the breach clock of a branch road the slowest in all branch roads, as breach clock 2, and the OPU1 after will aliging according to this breach clock 2 reads, and obtains the OPU1-4v of alignment.This breach clock 2 is the corresponding breach clock of OPU1 Virtual Concatenation container.
Above-mentioned steps has obtained the OPU1-4v and the corresponding breach clock 2 thereof of alignment, needs by separating mapping step professional payload to be extracted after the alignment.
Step 106: extract the STM-64 payload among the OPU1-4V that obtains from step 105, control information, the filling information filled in during by deletion expense and asynchronous mapping generate breach clock 3.
Step 107: according to the breach clock 2 identification OPU1 pointer adjustment information that obtain in the step 105, the positive and negative adjustment information during according to OPU1-4v identification asynchronous mapping.
Because pointer adjustment information and positive and negative adjustment information are introduced the shake of low frequency high amplitude, need by further level and smooth step filtering, so need obtain level and smooth breach clock by following traffic smoothing step, and read level and smooth professional payload by this level and smooth breach clock.
Step 108: positive and negative adjustment information and OPU1 pointer adjustment information according to the mapping of obtaining in the step 107 are selected the equally distributed scheduling pattern of breach, obtain level and smooth professional payload according to the equally distributed scheduling pattern of this breach from the professional payload that step 106 is obtained.
With breach clock 3 payload is write FIFO, utilize the traffic smoothing algorithm to generate breach clock 4 simultaneously, the professional payload read-out speed of control from FIFO.
The scheduling pattern computational methods of traffic smoothing algorithm are as follows: suppose to use 3 scheduling pattern MapA, MapB and MapC, corresponding respectively positive justification, negative justification and do not adjust.
With the OPU1 pointer adjustment information and the positive and negative adjustment information addition of obtaining in the step 107, obtain leakage value, can carry out the leakage of bit-level by the leak rate control algolithm to this value, after the leak rate control algolithm, the shake of low frequency high amplitude is expanded to the shake of high frequency short arc, and pass through the low-pass filtering link filtering of phase-locked loop; For just, and absolute value leaks unit (being the bit wide of FIFO) more than or equal to one, then selects MapA as this leakage value; As this leakage value is negative, and absolute value is then selected MapB more than or equal to a leakage unit; Leak unit as this leakage value absolute value less than one, then select MapC.Selected scheduling pattern is stamped uniform breach, and the uniform clock of the breach of this selection is a breach clock 4.As reading clock, read the professional payload in the level and smooth subelement with the uniform breach clock 4 of breach, obtain level and smooth professional payload.So just realized level and smooth to business.
Separate mapping for STM-64 to OPU1-4V, the scheduling pattern can be designed as: MapA=(255,237) (represent 255 clock cycle, 237 effectively), MapB=(255,239), MapC=(255,238).
If the payload clock jitter that the adjustment of OPU1 pointer causes is the disposable shake that discharges meeting initiation clock at a pattern selection cycle fully, here increasing some low frequency filterings handles, the adjustment statistics of OPU pointer is judged, a parameter as the control of control leak rate, the speed of releasing of steering needle adjustment can reduce the moment shake of clock.
Step 109: follow the tracks of the equally distributed scheduling pattern of breach, obtain out data clock.In the present embodiment, can adopt clock to follow the tracks of by phase-locked loop, the clock tracing phase-locked loop can be an analog loop, also can be digital rings, the reference clock of tracking, and promptly the object of Gen Zonging is a breach clock 4, the data clock that obtains is continuous STM-64 clock.
Utilization recovers business datum through the data clock that phase-locked loop obtains from the level and smooth professional payload that step 107 obtains.
The described technical scheme of the embodiment of the invention is floated with the framing again of Virtual Concatenation delay compensation, is shone upon the shake that effectively suppresses synchronously and shine upon introducing in conjunction with asynchronous separating again by the OPUk fixed point of synchronizing process, has solved fixed bit rate and has transmitted the clock jitter index deterioration problem of bringing through the OTN Virtual Concatenation.Being particularly useful for many virtual cascade group recombinates at a Su Duan.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the Virtual Concatenation synchro system in the optical transfer network is characterized in that described system comprises:
Lock unit, being used for that each branch road optical channel transmission unit is carried out clock synchronization handles, produce synchronically controlling information, the synchronically controlling information of each branch road is carried out the pointer adjustment, produces synchronous optical channel Payload Unit and breach clock accordingly thereof according to the FIFO waterline;
Virtual Concatenation delay compensation unit, be used for the described synchronous optical channel Payload Unit of all branch roads is carried out Virtual Concatenation delay compensation, obtain the optical channel Payload Unit Virtual Concatenation container of alignment according to the synchronous optical channel Payload Unit of described each branch road and corresponding breach clock thereof, obtain the corresponding breach clock of described optical channel Payload Unit Virtual Concatenation container according to the corresponding breach clock of the synchronous optical channel Payload Unit of described each branch road;
The asynchronous map unit of separating, be used for extracting professional payload, obtain the positive and negative adjustment information and the optical channel Payload Unit pointer adjustment information of mapping respectively according to the optical channel Payload Unit Virtual Concatenation container and the corresponding breach clock thereof of described alignment from the optical channel Payload Unit Virtual Concatenation container of described alignment;
Level and smooth professional acquiring unit, be used for selecting the equally distributed scheduling pattern of breach, from described professional payload, obtain level and smooth professional payload according to the equally distributed scheduling pattern of described breach according to the positive and negative adjustment information and the optical channel Payload Unit pointer adjustment information of described mapping;
The business datum recovery unit is used for obtaining data clock by following the tracks of the equally distributed scheduling pattern of described breach, and utilizes described data clock to recover business datum from described level and smooth professional payload.
2. the Virtual Concatenation synchro system in the optical transfer network as claimed in claim 1 is characterized in that, described lock unit specifically comprises:
Subelement is used for that each branch road optical channel transmission unit is carried out clock synchronization and handles synchronously, produces synchronically controlling information;
The waterline detection sub-unit is used to detect each branch road FIFO waterline;
The unsteady control sub unit of fixed point, be used for being provided with positive justification position and negative justification position in the fixed position of optical channel transmission unit, testing result synchronically controlling information to described each branch road on described positive negative justification position according to described waterline detection sub-unit carries out the pointer adjustment, produces synchronous optical channel Payload Unit and corresponding breach clock thereof.
3. the Virtual Concatenation synchro system in the optical transfer network as claimed in claim 1 is characterized in that, described Virtual Concatenation delay compensation unit specifically comprises:
Virtual Concatenation delay compensation buffer memory is used to write and the synchronous optical channel Payload Unit of each branch road of buffer memory;
Recognin unit, slow channel is used for choosing according to multiple frame number information the corresponding breach clock of channel number of the slowest branch road optical channel Payload Unit;
Virtual Concatenation is the framing subelement again, be used for reading each branch road optical channel Payload Unit of described Virtual Concatenation delay compensation buffer memory according to the corresponding breach clock of the channel number of the slowest described branch road optical channel Payload Unit, obtain the optical channel Payload Unit Virtual Concatenation container of alignment, and with the corresponding breach clock of the channel number of the slowest described branch road optical channel Payload Unit as the corresponding breach clock of described optical channel Payload Unit Virtual Concatenation container.
4. the Virtual Concatenation synchro system in the optical transfer network as claimed in claim 1 is characterized in that, described level and smooth professional acquiring unit specifically comprises:
The chock smotthing subelement, be used for obtaining leakage value according to the positive and negative adjustment information and the optical channel Payload Unit pointer adjustment information of described mapping, described leakage value is carried out leak rate control, according to selecting the equally distributed scheduling pattern of breach through the leakage value after the leak rate control;
Level and smooth subelement is used for obtaining level and smooth professional payload according to the equally distributed scheduling pattern of described breach from described professional payload.
5. the Virtual Concatenation synchro system in the optical transfer network as claimed in claim 4 is characterized in that, described chock smotthing subelement also comprises:
Low frequency filtering is handled subelement, is used for the statistics of described leakage value is judged that carrying out leak rate controls.
6. the Virtual Concatenation method for synchronous in the optical transfer network is characterized in that, said method comprising the steps of:
Each branch road optical channel transmission unit is carried out clock synchronization handle, produce synchronically controlling information, the synchronically controlling information of each branch road is carried out the pointer adjustment, produces synchronous optical channel Payload Unit and breach clock accordingly thereof according to the FIFO waterline;
Described synchronous optical channel Payload Unit to all branch roads carries out Virtual Concatenation delay compensation, obtain the optical channel Payload Unit Virtual Concatenation container of alignment according to the synchronous optical channel Payload Unit of described each branch road and corresponding breach clock thereof, obtain the corresponding breach clock of described optical channel Payload Unit Virtual Concatenation container according to the corresponding breach clock of the synchronous optical channel Payload Unit of described each branch road;
From the optical channel Payload Unit Virtual Concatenation container of described alignment, extract professional payload, obtain the positive and negative adjustment information and the optical channel Payload Unit pointer adjustment information of mapping respectively according to the optical channel Payload Unit Virtual Concatenation container and the corresponding breach clock thereof of described alignment;
Positive and negative adjustment information and optical channel Payload Unit pointer adjustment information according to described mapping are selected the equally distributed scheduling pattern of breach, obtain level and smooth professional payload according to the equally distributed scheduling pattern of described breach from described professional payload;
Follow the tracks of the equally distributed scheduling pattern of described breach and obtain data clock, and utilize described data clock from described level and smooth professional payload, to recover business datum.
7. the Virtual Concatenation method for synchronous in the optical transfer network as claimed in claim 6, it is characterized in that, describedly according to the FIFO waterline synchronically controlling information of each branch road is carried out the pointer adjustment, the step that produces synchronous optical channel Payload Unit and corresponding breach clock thereof specifically comprises:
Detect each branch road FIFO waterline;
Positive justification position and negative justification position are set in the fixed position of optical channel transmission unit, carry out the pointer adjustment according to testing result synchronically controlling information to described each branch road on described positive negative justification position, produce synchronous optical channel Payload Unit and corresponding breach clock thereof.
8. the Virtual Concatenation method for synchronous in the optical transfer network as claimed in claim 6, it is characterized in that, describedly obtain the optical channel Payload Unit Virtual Concatenation container of alignment according to the synchronous optical channel Payload Unit of described each branch road and corresponding breach clock thereof, the step that obtains the corresponding breach clock of described optical channel Payload Unit Virtual Concatenation container according to the corresponding breach clock of the synchronous optical channel Payload Unit of described each branch road specifically comprises:
Write and each branch road optical channel Payload Unit of buffer memory;
Choose the corresponding breach clock of channel number of the slowest branch road optical channel Payload Unit according to multiple frame number information;
Read each branch road optical channel Payload Unit according to the corresponding breach clock of the channel number of the slowest described branch road optical channel Payload Unit, obtain the optical channel Payload Unit Virtual Concatenation container of alignment, and with the corresponding breach clock of the channel number of the slowest described branch road optical channel Payload Unit as the corresponding breach clock of described optical channel Payload Unit Virtual Concatenation container.
9. the Virtual Concatenation method for synchronous in the optical transfer network as claimed in claim 6 is characterized in that, described positive and negative adjustment information and optical channel Payload Unit pointer adjustment information according to described mapping selects the step of the equally distributed scheduling pattern of breach specifically to comprise:
Positive and negative adjustment information and optical channel Payload Unit pointer adjustment information according to described mapping obtain leakage value, and described leakage value is carried out leak rate control, according to selecting the equally distributed scheduling pattern of breach through the leakage value after the leak rate control.
10. the Virtual Concatenation method for synchronous in the optical transfer network as claimed in claim 9 is characterized in that, described method also comprises:
Increase low frequency filtering and handle, the statistics of described leakage value is judged carried out leak rate control.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101461698A CN101374030B (en) | 2007-08-24 | 2007-08-24 | Synchronizing system and method for virtual cascade of light transportation network |
| PCT/CN2008/072069 WO2009026831A1 (en) | 2007-08-24 | 2008-08-20 | A system and a method for virtual concatenation synchronization in optical transport network |
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| CN2007101461698A CN101374030B (en) | 2007-08-24 | 2007-08-24 | Synchronizing system and method for virtual cascade of light transportation network |
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| CN101374030B CN101374030B (en) | 2011-05-18 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101867848A (en) * | 2009-04-20 | 2010-10-20 | 华为技术有限公司 | Transmission method of high-speed data stream and corresponding equipment and system |
| WO2010135864A1 (en) * | 2009-05-26 | 2010-12-02 | 华为技术有限公司 | Method, device and communication system of transmitting client data |
| WO2011026417A1 (en) * | 2009-09-04 | 2011-03-10 | 中兴通讯股份有限公司 | Method and device for indicating client signal fail |
| CN102811108A (en) * | 2011-06-02 | 2012-12-05 | 中兴通讯股份有限公司 | Method and system for optimizing protection switching performance |
| CN103067152A (en) * | 2012-12-26 | 2013-04-24 | 中国海洋石油总公司 | Method and system of clock distributing in ocean seismic survey system |
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| CN102480415B (en) * | 2010-11-26 | 2015-10-21 | 中兴通讯股份有限公司 | A kind of method and device being recovered optical transport network clock by reference clock |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL152314A (en) * | 2002-10-16 | 2007-07-04 | Eci Telecom Ltd | Handling traffic in a synchronous communication network |
| US7801934B2 (en) * | 2003-04-22 | 2010-09-21 | Agere Systems Inc. | Pointer generation method and apparatus for delay compensation in virtual concatenation applications |
| CN1301609C (en) * | 2003-05-23 | 2007-02-21 | 中兴通讯股份有限公司 | Virtual cascade time delay compensation restoring apparatus |
| CN1996807B (en) * | 2005-12-26 | 2011-04-20 | 中兴通讯股份有限公司 | A method for non damage virtual cascaded delay compensation |
| CN1983885B (en) * | 2005-12-31 | 2011-05-11 | 华为技术有限公司 | Method and device for de-reflecting from light-channel data unit to synchronous light-transmitting network |
-
2007
- 2007-08-24 CN CN2007101461698A patent/CN101374030B/en not_active Expired - Fee Related
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2008
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867848A (en) * | 2009-04-20 | 2010-10-20 | 华为技术有限公司 | Transmission method of high-speed data stream and corresponding equipment and system |
| CN101867848B (en) * | 2009-04-20 | 2013-06-05 | 华为技术有限公司 | Transmission method of high-speed data stream and corresponding equipment and system |
| WO2010135864A1 (en) * | 2009-05-26 | 2010-12-02 | 华为技术有限公司 | Method, device and communication system of transmitting client data |
| CN101981831B (en) * | 2009-05-26 | 2013-08-28 | 华为技术有限公司 | Method, device and communication system of transmitting client data |
| WO2011026417A1 (en) * | 2009-09-04 | 2011-03-10 | 中兴通讯股份有限公司 | Method and device for indicating client signal fail |
| CN102811108A (en) * | 2011-06-02 | 2012-12-05 | 中兴通讯股份有限公司 | Method and system for optimizing protection switching performance |
| WO2012163139A1 (en) * | 2011-06-02 | 2012-12-06 | 中兴通讯股份有限公司 | Method and system for optimizing protection switching performance |
| CN102811108B (en) * | 2011-06-02 | 2016-06-29 | 中兴通讯股份有限公司 | A kind of method and system optimizing pretection switch performance |
| CN103067152A (en) * | 2012-12-26 | 2013-04-24 | 中国海洋石油总公司 | Method and system of clock distributing in ocean seismic survey system |
| CN108959143A (en) * | 2017-05-22 | 2018-12-07 | 中兴通讯股份有限公司 | A kind of Optical Transmission Network OTN equipment and method for processing business |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009026831A1 (en) | 2009-03-05 |
| CN101374030B (en) | 2011-05-18 |
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