CN102761384B - OTN network neutral line variable bandwidth clock tracing method and apparatus - Google Patents
OTN network neutral line variable bandwidth clock tracing method and apparatus Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/062—Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers
- H04J3/0623—Synchronous multiplexing systems, e.g. synchronous digital hierarchy/synchronous optical network (SDH/SONET), synchronisation with a pointer process
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1652—Optical Transport Network [OTN]
- H04J3/1664—Optical Transport Network [OTN] carrying hybrid payloads, e.g. different types of packets or carrying frames and packets in the paylaod
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
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Abstract
The invention discloses a kind of OTN network neutral line variable bandwidth clock tracing method and apparatus, belong to field of optical transport network.The method comprises: intermediate node receives high-order light data cell HO-ODUk, and reads the Bandwidth adjustment mark BWR_IND in described HO-ODUk, and wherein, described BWR_IND is used to indicate the Bandwidth adjustment state of flexible rate light digital units ODUflex; Described intermediate node, according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, compensates the linear variable bandwidth clock of described intermediate node.This device comprises: receiver module and compensating module.
Description
Technical field
The present invention relates to field of optical transport network, particularly a kind of OTN network neutral line variable bandwidth clock tracing method and apparatus.
Background technology
At OTN (Optical Transport Network, optical transfer network) in network, a kind of container is had to be defined as flexible rate light digital units ODUflex, bandwidth varying supported by this container, for carrying different client traffic, but because ODUflex can not light-emitting window, high-order ODUk need be mapped to transmit, the high-order timeslot number that this container takies can from minimum adjust to maximum, if high-order is ODU3, the support of ODUflex bandwidth adjusts to 40Gbps from 1.25Gbps, BWR (Bandwidth Resize is carried out at ODUflex, Bandwidth adjustment) in process, can not service damage be there is in requirement.
After analyzing prior art, inventor finds that prior art at least has following shortcoming:
When carrying out ODUflex BWR, can introduce delay to the transfer process of clock information, this delay can cause buffer to read and write and occur frequency difference, causes buffer to overflow, service damage.
Summary of the invention
Embodiments provide a kind of OTN network neutral line variable bandwidth clock tracing method and apparatus.Described technical scheme is as follows:
A kind of OTN network neutral line variable bandwidth clock tracing method, comprising:
Intermediate node receives high-order light data cell HO-ODUk, and reads the Bandwidth adjustment mark BWR_IND in described HO-ODUk, and wherein, described BWR_IND is used to indicate the Bandwidth adjustment state of flexible rate light digital units ODUflex; Described intermediate node, according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, compensates the linear variable bandwidth clock of described intermediate node;
The Bandwidth adjustment state of described ODUflex comprises: ODUflex is in Bandwidth adjustment; And ODUflex is not in Bandwidth adjustment;
Described ODUflex bandwidth rate of change is every 100 microseconds of N byte, and N is natural number;
When described intermediate node is in mapping process, described intermediate node, according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, compensates the linear variable bandwidth clock of described intermediate node, specifically comprises:
When ODUflex is in Bandwidth adjustment, at each HO-ODUk multi-frame frame head place, offset is specified to compensate the Cn that mapping process exports with first, the initial value of described first appointment offset is 0, and to sentence N byte at each HO-ODUk multi-frame frame head be that tolerance increases progressively, until described first specify offset to reach 2N byte after, remain unchanged, wherein, described Cn is the value of input clock information after mapping of MAP.
A kind of OTN network neutral line variable bandwidth clock tracing device, comprising:
Receiver module, for receiving high-order light data cell HO-ODUk, and read the Bandwidth adjustment mark BWR_IND in described HO-ODUk, wherein, described BWR_IND is used to indicate the Bandwidth adjustment state of flexible rate light digital units ODUflex;
Compensating module, for according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, compensates the linear variable bandwidth clock of described intermediate node;
The Bandwidth adjustment state of described ODUflex comprises: ODUflex is in Bandwidth adjustment; And ODUflex is not in Bandwidth adjustment;
Described ODUflex bandwidth rate of change is every 100 microseconds of N byte, and N is natural number;
When described intermediate node is in mapping process, described compensating module comprises:
Judging unit, for according to described BWR_IND, judges the Bandwidth adjustment state of ODUflex;
First compensating unit, for when ODUflex is in Bandwidth adjustment, at each HO-ODUk multi-frame frame head place, specify offset to compensate the Cn that mapping process exports with first, the initial value of described first appointment offset is 0, and to sentence N byte at each HO-ODUk multi-frame frame head be that tolerance increases progressively, until described first specifies after offset reaches 2N byte, remain unchanged, wherein, described Cn is the value of input clock information after mapping of MAP.
The beneficial effect of the technical scheme that the embodiment of the present invention provides is:
By specifying the bandwidth rate of change of ODUflex in OTN network, and utilize Bandwidth adjustment mark BWR_IND to indicate Bandwidth adjustment state and bandwidth rate of change to compensate mapping the delay that in MAP process and demapping DeMAP process, clock conversion is caused, reach the object that bandwidth change clock is followed the tracks of, avoid the generation of frequency difference, maintain the harmless of business.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is that in OTN network, MAP module totality structure and signal move towards schematic diagram;
Fig. 2 is that in OTN network, DeMAP module totality structure and signal move towards schematic diagram;
Fig. 3 is the flow chart of a kind of OTN network neutral line variable bandwidth clock tracing method that the embodiment of the present invention provides;
Fig. 4 is the flow chart of a kind of OTN network neutral line variable bandwidth clock tracing method that the embodiment of the present invention provides;
Fig. 5 is the flow chart of a kind of OTN network neutral line variable bandwidth clock tracing method that the embodiment of the present invention provides;
Flow chart to the identification method of BWR process in a kind of OTN network that Fig. 6 provides for the embodiment of the present invention;
Fig. 7 is the structural representation of a kind of OTN network neutral line variable bandwidth clock tracing device that the embodiment of the present invention provides;
Fig. 8 a is the structural representation of a kind of OTN network neutral line variable bandwidth clock tracing device that the embodiment of the present invention provides;
Fig. 8 b is the structural representation of a kind of OTN network neutral line variable bandwidth clock tracing device that the embodiment of the present invention provides;
Fig. 9 be a kind of OTN network neutral line variable bandwidth clock tracing device of providing of the embodiment of the present invention in DeMAP process with the structural representation of DEMAP module;
Figure 10 for the embodiment of the present invention provide a kind of in OTN network to the schematic diagram of the identity device of BWR process.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Before introducing linear variable bandwidth clock tracing method provided by the invention, first concise and to the point introduction is carried out to rudimentary knowledge of the present invention:
The implementation of linear bandwidth adjustment sets initial bandwidth and object tape and bandwidth rate of change for user, after issuing starting command, and bandwidth linear increase or be reduced to target bandwidth.Citing: if initial bandwidth is 1.25G, target bandwidth is 40G, and it is 1 byte/100 μ s that bandwidth is changed to, issues after starting name, and bandwidth is from 1.25G, and every 100 μ s multiple 1 byte on the basis of upper 100 μ s, until send bandwidth to equal 40G stopping.
In OTN network, MAP module totality structure and signal trend are as shown in Figure 1, this module comprises: mapping device, unit delay sampled point, buffer memory buffer and sigma_delta (a kind of by the method for numerical value fractional frequency division) module, see ITU-T G.709Annex D; Input ODUflex clock information ck_in is converted into the Cn value (Cn represents the byte number transmitted within HO-ODUk multiframe period) of the GMP mapping mode that G.709 ITU-T defines by MAP functions of modules in mapping device.During non-BWR, the GMP mapping mode that G.709 Cn defines according to ITU-T produces, and during BWR, the delay realizing the introducing of GMP agreement due to system can cause occurring frequency difference in buffer read-write, needs to carry out frequency difference compensation.Fig. 2 is module totality structure and signal trend in DeMAP process, is not repeated herein.
Fig. 3 is the flow chart of a kind of OTN network neutral line variable bandwidth clock tracing method that the embodiment of the present invention provides.See Fig. 3, this embodiment comprises:
301: intermediate node receives HO-ODUk (High Order ODUk, high-order light data cell), and the Bandwidth adjustment mark BWR_IND read in described HO-ODUk, wherein, described BWR_IND is used to indicate the Bandwidth adjustment state of flexible rate light digital units ODUflex;
Wherein, the flexible rate light digital units expense ODUflex RCOH that is carried on of described BWR_IND or high-order ODUk expense HO-ODUk RCOH.
Wherein, the comprising of Bandwidth adjustment state of described flexible rate light digital units ODUflex:
ODUflex is in Bandwidth adjustment; And
ODUflex is not in Bandwidth adjustment or Bandwidth adjustment terminates.
Further, when BWR_IND is 1, instruction ODUflex is in Bandwidth adjustment, and when BWR_IND is 0, instruction ODUflex is not in Bandwidth adjustment or Bandwidth adjustment terminates;
302: described intermediate node, according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, compensates the linear variable bandwidth clock of described intermediate node.
By specifying the bandwidth rate of change of ODUflex in OTN network, and utilize Bandwidth adjustment state and bandwidth rate of change to map to clock in MAP process the delay caused to compensate, avoid the generation of frequency difference, maintain can't harm of business.
Fig. 4 is the flow chart of a kind of OTN network neutral line variable bandwidth clock tracing method that the embodiment of the present invention provides.Embodiment shown in Fig. 4 is based in the embodiment shown in Fig. 3, to the method that the clock in mapping process during intermediate node online property variable bandwidth is followed the tracks of, ODUflex bandwidth rate of change is every 100 microseconds of N byte, N is natural number, this bandwidth rate of change is by default, see Fig. 4, this embodiment comprises:
401: receive HO-ODUk, and read the Bandwidth adjustment mark BWR_IND in HO-ODUk;
Wherein, ODUflex RCOH or HO-ODUk RCOH comprises the Bandwidth adjustment BWR state that Bandwidth adjustment mark BWR_IND, this BWR_IND are used to indicate ODUflex;
Preferably, this BWR_IND can take the expense of 1bit in ODUflex RCOH or HO-ODUk RCOH.
Further, when this HO-ODUk RCOH comprises Bandwidth adjustment mark BWR_IND, the BWR_IND of an intermediate node on this intermediate node Bidirectional transparent transmission.When ODUflex RCOH comprises Bandwidth adjustment mark BWR_IND, BWR_IND transmits as business, and the regulation without the need for this Bidirectional transparent transmission both can be transmitted.
402: according to described BWR_IND, judge the Bandwidth adjustment state of ODUflex;
In the present embodiment, when ODUflex starts BWR, this BWR_IND is 1 from 0 saltus step;
When ODUflex terminates BWR, be 0 by this BWR_IND from 1 saltus step.
Because BWR_IND can indicate ODUflex whether to carry out BWR, so when carrying out MAP process, need detect BWR_IND.
403: when this BWR_IND is 1 by 0 saltus step, ODUflex starts Bandwidth adjustment, each HO-ODUk multi-frame frame head place after saltus step, specify offset to compensate the Cn that mapping process exports with first, the initial value of this first appointment offset is 0, and to sentence N byte at each HO-ODUk multi-frame frame head be that tolerance increases progressively, until this first specifies after offset reaches 2N byte, remain unchanged, wherein, this Cn is the value of input clock information after mapping of MAP;
Those skilled in the art can be known, during BWR, input ODUflex bandwidth linear increases or linearly reduces, buffer reads and writes phase delay can produce frequency difference, therefore, during BWR, need to adopt compensator to carry out frequency difference compensation, if input ODUflex bandwidth rate of change is N byte/100 μ s, then offset is 2 times of N bytes.
Particularly, each HO-ODUk multi-frame frame head place after saltus step, the output signal Cn of MAP process is compensated first and specifies offset, this the first appointment offset increases progressively, that is to say that first HO-ODUk multi-frame frame head place after saltus step compensates N byte, second multi-frame frame head place is that Cn compensates 2N byte, the 3rd 100 microseconds are that Cn compensates 2N byte, after specifying offset to reach 2N byte first, if BWR_IND does not change, then keeping the first numerical value of specifying offset current, is that Cn compensates 2N byte at follow-up each HO-ODUk multi-frame frame head place.
404: when this BWR_IND is 0 by 1 saltus step, ODUflex terminates Bandwidth adjustment, each HO-ODUk multi-frame frame head place after saltus step, offset is specified to compensate the Cn that mapping process exports with second, it is that tolerance is successively decreased that this second appointment offset sentences N at each HO-ODUk multi-frame frame head, until this second appointment offset reaches 0;
Concrete methods of realizing in this process and 403 similar, just offset is distinguished to some extent, in step 403, owing to being during BWR, offset increases progressively, and in step 404, from transitional states, BWR terminates, therefore, offset successively decreases, until second specifies offset to reach 0, then terminates to compensate.
In step 403 and step 404, those skilled in the art can be known, actual HO-ODUk TS is less than 100 μ s multiframe period, the offset of 2N byte is larger than actual frequency difference, but deviation is very little, can be finely tuned output Cn value by buffer fill and absorb the different HO-ODUk TS faint frequency difference that multiframe period, deviation caused;
By specifying the bandwidth rate of change of ODUflex in OTN network, and utilize Bandwidth adjustment to identify BWR_IND instruction Bandwidth adjustment state, and bandwidth rate of change compensates the delay that clock in MAP process conversion is caused, in the mapping MAP process of the embodiment of the present invention, obtain exporting Cn value according to offset during input clock ck_in and input and output identified result buffer fill and ODUflex BWR, reach the object that bandwidth change clock is followed the tracks of, avoid the generation of frequency difference, maintain the harmless of business.
Fig. 5 is the flow chart of a kind of OTN network neutral line variable bandwidth clock tracing method that the embodiment of the present invention provides.Particularly, this embodiment is a kind of method of in OTN network, intermediate node DeMAP process being carried out to clock recovery, those skilled in the art can be known, in DeMAP process, extract Cn information from data flow, revert to clock information by Sigma Delta algorithm, and adopt filter to carry out shaping filter to recovered clock, clock after output filtering, filtered clock carries out phase demodulation by feedback and recovered clock, and identified result buffer fill finely tunes output clock.ODUflex bandwidth rate of change is every 100 microseconds of N byte, and N is natural number, and preferably, filter is FIR (Finite Impulse Response, finite impulse response) low pass filter, and preferably, sample frequency is 10KHz.FIR filtering has good linear phase characteristic, its stop band gain and can setting according to system requirements by frequency.
See Fig. 5, this embodiment comprises:
501: receive HO-ODUk, and read the Bandwidth adjustment mark BWR_IND in HO-ODUk;
Wherein, ODUflex RCOH or HO-ODUk RCOH comprises the Bandwidth adjustment BWR state that 1bit Bandwidth adjustment mark BWR_IND, described BWR_IND are used to indicate ODUflex;
502: according to described BWR_IND, judge the Bandwidth adjustment state of ODUflex;
In digital system, during being subject to processing system clock accuracy and ODUflex BWR, clock decimal ∑ CnD lacks impact, the clock quality directly recovered from Cn is poor, when multistage website cascade, can vibration be introduced, cause losing lock, therefore, add filter and filter shape is carried out to recovered clock, and when carrying out filter shape, frequency difference can be caused due to clock delay.
503: when described BWR_IND is 1 by 0 saltus step, ODUflex starts Bandwidth adjustment each HO-ODUk multi-frame frame head place after saltus step, the clock of offset to de-mapping process is specified to compensate with the 3rd, the initial value of described 3rd appointment offset is 0, and to sentence N byte at each HO-ODUk multi-frame frame head be that tolerance increases progressively, until the described 3rd specifies offset to reach
after byte, remain unchanged, wherein, b
ifor described filter coefficient, i={2,3 ... .M}, M is filter order, and fs is filter sample frequency;
Specific implementation process in this step and step 403 similar, difference is that the 3rd specifies the object chosen and compensate of offset, and the 3rd specifies the initial value of offset to be 0, is that tolerance increases progressively, and is reaching with N
remain unchanged doubly, the object of compensation is the output of filter, does not repeat them here.
Those skilled in the art can be known, FIR filter transfer function is as follows:
H(Z)＝b
0+b
1z
-1+b
2z
-2+......+b
Mz
-M
According to filter transfer function and input bandwidth rate of change N byte/100 μ s two conditions, can reasoning obtain as drawn a conclusion:
(1) for linear input, FIR filter linear convergent rate;
(2) input for bandwidth rate of change N byte/100 μ s, between filter input and output, difference is
wherein b
i, i={2,3 ... .M} be FIR filter coefficient, M is filter order;
According to inference conclusion above, DeMAP offset is the offset calculated above
504: when described BWR_IND is 0 by 1 saltus step, ODUflex terminates Bandwidth adjustment, each HO-ODUk multi-frame frame head place after saltus step, the clock of offset to de-mapping process is specified to compensate with the 4th, it is that tolerance is successively decreased that described 4th appointment offset sentences N at each HO-ODUk multi-frame frame head, until the described 4th specifies offset to reach 0.
By specifying the bandwidth rate of change of ODUflex in OTN network, and utilize Bandwidth adjustment mark BWR_IND and bandwidth rate of change to compensate the delay that clock in DeMAP process conversion is caused, reach the object that bandwidth change clock is followed the tracks of, avoid the generation of frequency difference, maintain the harmless of business.
Fig. 6 is the flow chart to the identification method of BWR process in a kind of OTN network of providing of the embodiment of the present invention, and ODUflex RCOH or HO-ODUk RCOH comprises 1bit Bandwidth adjustment mark BWR_IND, comprising:
601: the state detecting BWR;
602: when ODUflex starts BWR, be 1 by described BWR_IND from 0 saltus step; When ODUflex terminates BWR, be 0 by described BWR_IND from 1 saltus step.
This mark is generally carried out in OTN network ODUflex source node.
Fig. 7 is the structural representation of a kind of OTN network neutral line variable bandwidth clock tracing device that the embodiment of the present invention provides, and comprising:
Receiver module 701, for receiving high-order light data cell HO-ODUk, and read the Bandwidth adjustment mark BWR_IND in described HO-ODUk, wherein, described BWR_IND is used to indicate the Bandwidth adjustment state of flexible rate light digital units ODUflex;
Compensating module 702, for according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, compensates the linear variable bandwidth clock of described intermediate node.
Wherein, the flexible rate light digital units expense ODUflex RCOH that is carried on of described BWR_IND or high-order ODUk expense HO-ODUk RCOH.
Wherein, the comprising of Bandwidth adjustment state of described flexible rate light digital units ODUflex:
ODUflex is in Bandwidth adjustment; And
ODUflex is not in Bandwidth adjustment.
In the present embodiment, described ODUflex bandwidth rate of change is every 100 microseconds of N byte, and N is natural number;
When described intermediate node is in mapping process, see Fig. 8 a, described compensating module 702 comprises:
Judging unit 702a, for according to described BWR_IND, judges the Bandwidth adjustment state of ODUflex;
First compensating unit 702b, for when ODUflex starts Bandwidth adjustment, each HO-ODUk multi-frame frame head place after saltus step, specify offset to compensate the Cn that mapping process exports with first, the initial value of described first appointment offset is 0, and to sentence N byte at each HO-ODUk multi-frame frame head be that tolerance increases progressively, until described first specifies after offset reaches 2N byte, remain unchanged, wherein, described Cn is the value of input clock information after mapping of MAP;
Second compensating unit 702c, for when ODUflex terminates Bandwidth adjustment, each HO-ODUk multi-frame frame head place after saltus step, offset is specified to compensate the Cn that mapping process exports with second, it is that tolerance is successively decreased that described second appointment offset sentences N at each HO-ODUk multi-frame frame head, until described second specifies offset to reach 0.
In another embodiment, ODUflex bandwidth rate of change is every 100 microseconds of N byte, and N is natural number; Described intermediate node adopts filter to carry out filter shape to the recovered clock of input signal Cn,
When described intermediate node is in de-mapping process, see Fig. 8 b, described compensating module 702 comprises:
Judging unit 702d, for according to described BWR_IND, judges the Bandwidth adjustment state of ODUflex;
3rd compensating unit 702e, for when ODUflex starts Bandwidth adjustment, each HO-ODUk multi-frame frame head place after saltus step, the clock of offset to de-mapping process is specified to compensate with the 3rd, the initial value of described 3rd appointment offset is 0, and to sentence N byte at each HO-ODUk multi-frame frame head be that tolerance increases progressively, until the described 3rd specifies offset to reach
after byte, remain unchanged, wherein, bi is described filter coefficient, i={2,3 ... .M}, M is filter order, and fs is filter sample frequency;
4th compensating unit 702f, for when ODUflex terminates Bandwidth adjustment, each HO-ODUk multi-frame frame head place after saltus step, the clock of offset to de-mapping process is specified to compensate with the 4th, it is that tolerance is successively decreased that described 4th appointment offset sentences N byte at each HO-ODUk multi-frame frame head, until the described 4th specifies offset to reach 0.
Described filter is finite impulse response low pass filter.
See Fig. 9, in de-mapping process, this tracking means is arranged in DeMAP module, and the BWR_IND according to input signal compensates recovered clock, belongs to same design with embodiment of the method, and its specific implementation process refers to embodiment of the method, repeats no more here.
Those skilled in the art can be known, the compensation described in the present invention, are to utilize offset to map with clock or the output valve of demapping superposes.
The device that the present embodiment provides, specifically can compensator on intermediate node, and belong to same design with embodiment of the method, its specific implementation process refers to embodiment of the method, repeats no more here.
Figure 10 for the embodiment of the present invention provide a kind of in OTN network to the schematic diagram of the identity device of BWR process, ODUflex RCOH or HO-ODUk RCOH comprise 1bit Bandwidth adjustment mark BWR_IND, comprising:
Detection module 1001, for detecting the state of BWR;
Described BWR_IND, for when ODUflex starts BWR, is 1 from 0 saltus step by saltus step module 1002;
Described BWR_IND, also for when ODUflex terminates BWR, is 0 from 1 saltus step by described saltus step module 1002.
The device that the present embodiment provides, is specifically as follows ODUflex source node, belongs to same design with embodiment of the method, and its specific implementation process refers to embodiment of the method, repeats no more here.
The all or part of of the technique scheme that the embodiment of the present invention provides can have been come by the hardware that program command is relevant, described program can be stored in the storage medium that can read, and this storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. an OTN network neutral line variable bandwidth clock tracing method, it is characterized in that, flexible rate light digital units expense ODUflex RCOH or high-order light data cell expense HO-ODUk RCOH comprises the Bandwidth adjustment BWR state that 1bit Bandwidth adjustment mark BWR_IND, described BWR_IND are used to indicate flexible rate light digital units ODUflex; Described method comprises:
Source node detects the state of BWR;
When described ODUflex starts BWR, described BWR_IND is 1 from 0 saltus step by described source node;
When described ODUflex terminates BWR, described BWR_IND is 0 from 1 saltus step by described source node;
Intermediate node receives high-order light data cell HO-ODUk, and reads the Bandwidth adjustment mark BWR_IND in described HO-ODUk;
Described intermediate node, according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, compensates the linear variable bandwidth clock of described intermediate node;
The Bandwidth adjustment state of described ODUflex comprises: ODUflex is in Bandwidth adjustment; And ODUflex is not in Bandwidth adjustment;
Described ODUflex bandwidth rate of change is every 100 microseconds of N byte, and N is natural number;
When described intermediate node is in mapping process, described intermediate node, according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, compensates the linear variable bandwidth clock of described intermediate node, specifically comprises:
When ODUflex is in Bandwidth adjustment, at each HO-ODUk multi-frame frame head place, offset is specified to compensate the Cn that mapping process exports with first, the initial value of described first appointment offset is 0, and to sentence N byte at each HO-ODUk multi-frame frame head be that tolerance increases progressively, until described first specify offset to reach 2N byte after, remain unchanged, wherein, described Cn is the value of input clock information after mapping of MAP.
2. method according to claim 1, it is characterized in that, when described intermediate node is in mapping process, described intermediate node is according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, the linear variable bandwidth clock of described intermediate node is compensated, specifically comprises:
When ODUflex is not in Bandwidth adjustment or at the end of Bandwidth adjustment, at each HO-ODUk multi-frame frame head place, offset is specified to compensate the Cn that mapping process exports with second, it is that tolerance is successively decreased that described second appointment offset sentences N at each HO-ODUk multi-frame frame head, until described second specifies offset to reach 0.
3. an OTN network neutral line variable bandwidth clock tracing method, it is characterized in that, flexible rate light digital units expense ODUflex RCOH or high-order light data cell expense HO-ODUk RCOH comprises the Bandwidth adjustment BWR state that 1bit Bandwidth adjustment mark BWR_IND, described BWR_IND are used to indicate flexible rate light digital units ODUflex; Described method comprises:
Source node detects the state of BWR;
When described ODUflex starts BWR, described BWR_IND is 1 from 0 saltus step by described source node;
When described ODUflex terminates BWR, described BWR_IND is 0 from 1 saltus step by described source node;
Intermediate node receives high-order light data cell HO-ODUk, and reads the Bandwidth adjustment mark BWR_IND in described HO-ODUk;
Described intermediate node, according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, compensates the linear variable bandwidth clock of described intermediate node;
The Bandwidth adjustment state of described ODUflex comprises: ODUflex is in Bandwidth adjustment; And ODUflex is not in Bandwidth adjustment;
Described ODUflex bandwidth rate of change is every 100 microseconds of N byte, and N is natural number; Described intermediate node adopts filter to carry out filter shape to the recovered clock of input signal Cn,
When described intermediate node is in de-mapping process, described intermediate node, according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, compensates the linear variable bandwidth clock of described intermediate node, specifically comprises:
When ODUflex is in Bandwidth adjustment, at each HO-ODUk multi-frame frame head place, the clock of offset to de-mapping process is specified to compensate with the 3rd, the initial value of described 3rd appointment offset is 0, and to sentence N byte at each HO-ODUk multi-frame frame head be that tolerance increases progressively, until the described 3rd specifies offset to reach
after byte, remain unchanged, wherein, bi is described filter coefficient, i={2,3 ... .M}, M is filter order, and fs is filter sample frequency;
When ODUflex is not in Bandwidth adjustment or at the end of Bandwidth adjustment, each HO-ODUk multi-frame frame head place after saltus step, the clock of offset to de-mapping process is specified to compensate with the 4th, it is that tolerance is successively decreased that described 4th appointment offset sentences N byte at each HO-ODUk multi-frame frame head, until the described 4th specifies offset to reach 0.
4. method according to claim 3, is characterized in that, described filter is finite impulse response low pass filter.
5. an OTN network neutral line variable bandwidth clock tracing device, it is characterized in that, flexible rate light digital units expense ODUflex RCOH or high-order light data cell expense HO-ODUk RCOH comprises the Bandwidth adjustment BWR state that 1bit Bandwidth adjustment mark BWR_IND, described BWR_IND are used to indicate flexible rate light digital units ODUflex; Described device comprises:
Detection module, for detecting the state of BWR;
Described BWR_IND, for when ODUflex starts BWR, is 1 from 0 saltus step by saltus step module;
Described BWR_IND, also for when ODUflex terminates BWR, is 0 from 1 saltus step by described saltus step module;
Receiver module, for receiving high-order light data cell HO-ODUk, and read the Bandwidth adjustment mark BWR_IND in described HO-ODUk, wherein, described BWR_IND is used to indicate the Bandwidth adjustment state of flexible rate light digital units ODUflex;
Compensating module, for according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, compensates the linear variable bandwidth clock of intermediate node;
The Bandwidth adjustment state of described ODUflex comprises: ODUflex is in Bandwidth adjustment; And ODUflex is not in Bandwidth adjustment;
Described ODUflex bandwidth rate of change is every 100 microseconds of N byte, and N is natural number;
When described intermediate node is in mapping process, described compensating module comprises:
Judging unit, for according to described BWR_IND, judges the Bandwidth adjustment state of ODUflex;
First compensating unit, for when ODUflex is in Bandwidth adjustment, at each HO-ODUk multi-frame frame head place, specify offset to compensate the Cn that mapping process exports with first, the initial value of described first appointment offset is 0, and to sentence N byte at each HO-ODUk multi-frame frame head be that tolerance increases progressively, until described first specifies after offset reaches 2N byte, remain unchanged, wherein, described Cn is the value of input clock information after mapping of MAP.
6. device according to claim 5, is characterized in that, when described intermediate node is in mapping process, described compensating module comprises:
Second compensating unit, for not being in Bandwidth adjustment or at the end of Bandwidth adjustment as ODUflex, at each HO-ODUk multi-frame frame head place, offset is specified to compensate the Cn that mapping process exports with second, it is that tolerance is successively decreased that described second appointment offset sentences N at each HO-ODUk multi-frame frame head, until described second specifies offset to reach 0.
7. an OTN network neutral line variable bandwidth clock tracing device, it is characterized in that, flexible rate light digital units expense ODUflex RCOH or high-order light data cell expense HO-ODUk RCOH comprises the Bandwidth adjustment BWR state that 1bit Bandwidth adjustment mark BWR_IND, described BWR_IND are used to indicate flexible rate light digital units ODUflex; Described device comprises:
Detection module, for detecting the state of BWR;
Described BWR_IND, for when ODUflex starts BWR, is 1 from 0 saltus step by saltus step module;
Described BWR_IND, also for when ODUflex terminates BWR, is 0 from 1 saltus step by described saltus step module;
Receiver module, for receiving high-order light data cell HO-ODUk, and read the Bandwidth adjustment mark BWR_IND in described HO-ODUk, wherein, described BWR_IND is used to indicate the Bandwidth adjustment state of flexible rate light digital units ODUflex;
Compensating module, for according to the Bandwidth adjustment state of described ODUflex and the bandwidth rate of change of ODUflex that pre-sets, compensates the linear variable bandwidth clock of intermediate node;
The Bandwidth adjustment state of described ODUflex comprises: ODUflex is in Bandwidth adjustment; And ODUflex is not in Bandwidth adjustment;
Described ODUflex bandwidth rate of change is every 100 microseconds of N byte, and N is natural number; Described intermediate node adopts filter to carry out filter shape to the recovered clock of input signal Cn,
When described intermediate node is in de-mapping process, described compensating module comprises:
3rd compensating unit, for when ODUflex is in Bandwidth adjustment, at each HO-ODUk multi-frame frame head place, the clock of offset to de-mapping process is specified to compensate with the 3rd, the initial value of described 3rd appointment offset is 0, and to sentence N byte at each HO-ODUk multi-frame frame head be that tolerance increases progressively, until the described 3rd specifies offset to reach
after byte, remain unchanged, wherein, bi is described filter coefficient, i={2,3 ... .M}, M is filter order, and fs is filter sample frequency;
4th compensating unit, for not being in Bandwidth adjustment or at the end of Bandwidth adjustment as ODUflex, each HO-ODUk multi-frame frame head place after saltus step, the clock of offset to de-mapping process is specified to compensate with the 4th, it is that tolerance is successively decreased that described 4th appointment offset sentences N byte at each HO-ODUk multi-frame frame head, until the described 4th specifies offset to reach 0.
8. device according to claim 7, is characterized in that, described filter is finite impulse response low pass filter.
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| CN201110110654.6A CN102761384B (en) | 2011-04-29 | 2011-04-29 | OTN network neutral line variable bandwidth clock tracing method and apparatus |
| PCT/CN2012/074980 WO2012146215A1 (en) | 2011-04-29 | 2012-05-02 | Method and device for tracking linear variable bandwidth clock in otn network |
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| WO2010142074A1 (en) * | 2009-06-09 | 2010-12-16 | 华为技术有限公司 | Lossless adjustment method of oduflex channel bandwidth and oduflex channel |
| CN101998182A (en) * | 2009-08-25 | 2011-03-30 | 华为技术有限公司 | Information processing method, optical communication device and optical communication system in optical networks |
| CN102006270A (en) * | 2009-08-28 | 2011-04-06 | 华为技术有限公司 | Negotiation method of link capability information, network equipment and communication system |
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| WO2010142074A1 (en) * | 2009-06-09 | 2010-12-16 | 华为技术有限公司 | Lossless adjustment method of oduflex channel bandwidth and oduflex channel |
| CN101998182A (en) * | 2009-08-25 | 2011-03-30 | 华为技术有限公司 | Information processing method, optical communication device and optical communication system in optical networks |
| CN102006270A (en) * | 2009-08-28 | 2011-04-06 | 华为技术有限公司 | Negotiation method of link capability information, network equipment and communication system |
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