CN101582718A - Wavelength protection method based on wavelength utilization rate in single link - Google Patents
Wavelength protection method based on wavelength utilization rate in single link Download PDFInfo
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- CN101582718A CN101582718A CNA2009100861739A CN200910086173A CN101582718A CN 101582718 A CN101582718 A CN 101582718A CN A2009100861739 A CNA2009100861739 A CN A2009100861739A CN 200910086173 A CN200910086173 A CN 200910086173A CN 101582718 A CN101582718 A CN 101582718A
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Abstract
The invention provides a wavelength protection method based on wavelength utilization rate in a single link, and related link nodes have optical wavelength conversion capacity. The method introduces the concept of wavelength utilization rate, and requires that a network can calculate the wavelength utilization rate of each wavelength in a transmission link in unit time quantum according to the situation of transmission service; the calculation results are stored in an array in a descending order. When an error occurs to the wavelength in the link, first idle wavelength is searched in the link, if the idle wavelength exists, then the idle wavelength is used for alternative transmission; if the idle wavelength does not exist, then the wavelength utilization rate of the wavelength with error is extracted form the array stored with wavelength utilization rate, and the wavelength with the lowest wavelength utilization rate is searched in the array in reverse order for alternative transmission. Therefore, the maximum protection of the transmission wavelength with higher wavelength utilization rate is realized, the invention is suitable for protection of important transactions and high capacity transactions, and the precision of the protection based on the wavelengths is further improved.
Description
Technical field:
The present invention relates to a kind of wavelength protection method,, improved the accuracy and the flexibility of protection, increased the transmission reliability of important service by the protection of this method realization to the higher wavelength of wavelength utilization rate at the wavelength utilization rate; Simultaneously, idle wavelength resource is shared in the link, has improved the utilance of wavelength resource in the link.The present invention relates to the survivability and the protection recovery technology of optical-fiber network, will protect recovery technology to refine to the wavelength protection field.
Background technology:
The mechanism commonly used that realizes optical network protection at present comprises:
1. according to recovering granule size, can be divided into protection mechanism based on link, passage and subpath
Protection based on link is to be that professional fault recovery is carried out on the basis with the link. when link failure takes place when; protection route of selecting and faulty link are irrelevant; promptly the internodal shortest path origin of trouble-shooting both link ends substitutes faulty link in current optical network resource, and this path and former service channel are not subjected to the new service channel of the common composition of the part of fault effects.Based on the protection of passage is to be unit with the wavelength business; between the sourcesink node, set up the protection passage; promptly the route of Xuan Zeing does not have common link with the professional route of former fault, generally be in current network resources, seek one remove after the former professional route resource shortest path by.Protection based on subpath is divided into a plurality of segmentations according to certain strategy with a passage; each segmentation adopts the path protection technology to protect as passage, and this is to based on link with based on the compromise of the resist technology of passage on resource utilization and switching time.The protection that is based on the wavelength in the single-link that the present invention proposes because seldom at the protection research approach of wavelength, so selected the simplest also the easiest realization based on the wavelength protection in the single-link.
2. can share according to resource conservation, can be divided into protection mechanism special-purpose and that share
In the protection mechanism of sharing, under the incoherent prerequisite of link between the assurance corresponding work passage, a plurality of protection passages can be shared identical wavelength resource in the part of path overlap, and each bar protection passage must use special-purpose resource in privacy protection.Therefore, compare with privacy protection, the protection mechanism of sharing has higher resource utilization, helps the reduction of network blocking probability.What the present invention proposed is the interior share protect based on wavelength of single-link.
3. according to the account form of recovering optical channel, can be divided into precomputation and the protection of calculating in real time
In the precomputation strategy, the route of recovering optical channel be before fault takes place according to certain calculative strategy calculated off-line, can not take into full account the variation of Internet traffic and the available resources of network.Calculative strategy is meant just to calculate after fault takes place and recovers path in real time, compare with the precomputation strategy, the calculative strategy resume speed is slower in real time, but the calculating of its restoration route can be considered current network topology and available resources, thereby has higher recovery efficient (success rate) and network resource utilization.What the present invention proposed is a kind of protection of real-time calculating.
Summary of the invention:
The object of the present invention is to provide a kind of guard method at optical wavelength in the single-link, the link nodes that this method relates to has the light wavelength conversion ability.This method has been introduced the notion of wavelength utilization rate, requires network can calculate the wavelength utilization rate of each wavelength in the transmission link according to the situation of transport service in the unit interval section, and the result of calculation descending leaves in the array, belongs to the protection of real-time calculating.When the wavelength in the link broke down, at first the idle wavelength of search in this link transmitted if there is idle wavelength then to substitute with idler progress row; If do not have; then in the array of depositing the wavelength utilization rate, extract the wavelength utilization rate of this wavelength; the minimum wavelength of inverted order search wavelength utilization rate substitutes transmission (the business time-out of original transmission on the protection wavelength in this array then; after the end of transmission to be protected; recover original professional transmission again), the wavelength utilization rate of claimed wavelength can not be higher than the wavelength utilization rate of fault wavelength.The maximum protection that this has just realized the transmission wavelength that the wavelength utilization rate is higher is applicable to the protection of important service and big capacity business; Sharing of the interior idle wavelength resource of link improved the utilance of resource in the link simultaneously; The accuracy and the flexibility of protection have further been improved based on the protection of wavelength.In addition, this wavelength protection method both had been applicable to the protection of link wavelength in the territory, also was applicable to the protection of domain-to-domain link wavelength in the multiple-domain network.
This method particular content is as follows:
1, a kind of wavelength protection method based on wavelength utilization rate in the single-link, the link nodes that relates to has the light wavelength conversion ability, and carrying out this method needs following process:
A. detection failure determines that fault is the wavelength fault in the link, and fault location is to the concrete link of certain bar;
B. calculate the wavelength utilization rate situation of all wavelengths in this link: U
i=m/n, wherein m represents: the occupied number of times of a certain wavelength in the unit interval section, n represents: the total professional number of wavelength transmission is arranged, U in the unit interval section in this faulty link more
iWavelength utilization rate for a certain definite wavelength;
C. the wavelength utilization rate of all wavelengths is put into array w[by descending], identical wavelength utilization rate all keeps, and all leaves w[in by computation sequence] in;
D. implement protection at the fault wavelength on this link, basic thought is: search idle wavelength earlier, the protection of then using is arranged, then do not utilize the minimum wavelength of wavelength utilization rate to seize the type protection, the specific implementation step is as follows:
Does step 1: detecting have idle wavelength available in this link? if have, then selecting wherein, an available free wavelength substitutes transmission;
Step 2: if do not have, at array w[] in extract the wavelength utilization rate of this fault wavelength, be assumed to w[p], and at w[] in the backward operation wavelength that searches out wavelength utilization rate minimum (being assumed to w[q) protect;
Step 3: judge w[p]＞w[q]? invalid words, the protection failure; Setting up, is w[q with the wavelength utilization rate] operation wavelength replacement wavelength utilization rate be w[p] the fault wavelength transmit.
The present invention has introduced the notion of wavelength utilization rate; it is a kind of real-time guard method; under share protect mechanism, adopt the protected mode of the type of seizing (can seize the wavelength resource of low wavelength utilization rate when being resource contention); guaranteed the wavelength protection of high wavelength utilization rate; improve the transmission reliability of important service and important wavelength, be applicable to the transmission of big capacity important service.
Use the guard method among the present invention that the higher wavelength of utilization rate is effectively protected; Protection at wavelength requires link nodes to have wavelength conversion capability and very strong fault location ability.This wavelength protection method both had been applicable to the protection of link wavelength in the territory, also was applicable to the protection of domain-to-domain link wavelength in the multiple-domain network.When being applied to the protection of wavelength between the territory, require the boundary node in each territory to have wavelength conversion capability and very strong fault location ability equally, so the cost of protection is higher, be adapted to the protection of big capacity important service.
Description of drawings:
Fig. 1 is the wavelength protection flow chart at the wavelength fault.Circle is represented link nodes, and the straight line of band arrow is represented link, the curve representation wavelength of link.
Fig. 2 is the guard method flow chart of this invention.
Fig. 3 is based on the specific implementation flow chart of the guard method of wavelength utilization rate.
Embodiment:
Below we illustrate the process of wavelength protection with an object lesson.
First kind of situation, when idle wavelength is arranged in the link:
A. in the drawings, link k detects fault, and link nodes determines that the wavelength in the k breaks down.
B. calculate the wavelength utilization rate situation of all wavelengths in this link: U
i=m/n.
C. the wavelength utilization rate of all wavelengths is put into array w[by descending], identical wavelength utilization rate all keeps, and all leaves w[in by computation sequence] in.
D. at first search idle wavelength: can search idle wavelength in the case, utilize the wavelength Conversion function of node to realize of the protection transmission of idle wavelength to the fault wavelength.
In this case, though do not use the array of wavelength utilization rate, still be necessary to the calculating of wavelength utilization rate; because concerning the real-time guard of all wavelengths; can save amount of calculation effectively like this, shorten computing time, improve the speed of protection.
Second kind of situation: do not have idle wavelength in the link
A. in the drawings, link k detects fault, and link nodes determines that the wavelength in the link k breaks down;
B. calculate the wavelength utilization rate situation of all wavelengths in this link: U
i=m/n;
C. the wavelength utilization rate of all wavelengths is put into array w[by descending], identical wavelength utilization rate all keeps, and all leaves w[in by computation sequence] in;
D. at first search idle wavelength: search in the case less than idle wavelength, skip to next step;
E. at array w[] in extract the wavelength utilization rate of this fault wavelength, be assumed to w[p], and at w[] in backward search out the minimum operation wavelength of wavelength utilization rate and protect, be assumed to w[q];
F. judge w[p]＞w[q]? setting up, is w[q with the wavelength utilization rate] operation wavelength replacement wavelength utilization rate be w[p] the fault wavelength transmit; Invalid words, protection failure (the wavelength utilization rate that the fault wavelength is described is too low).
Claims (2)
1, a kind of wavelength protection method based on wavelength utilization rate in the single-link, it is characterized in that: the link nodes that this method relates to has the light wavelength conversion ability, and its concrete steps are:
A. detection failure determines that fault is the wavelength fault in the link, and determines the concrete link that breaks down;
B. calculate the wavelength utilization rate situation of all wavelengths in this link: U
i=m/n, wherein m represents: the occupied number of times of i wavelength in the unit interval section, n represents: the total professional number of all wavelengths transmission in this faulty link in the unit interval section, U
iWavelength utilization rate for the i wavelength;
C. the wavelength utilization rate of all wavelengths is put into array w[by descending], identical wavelength utilization rate all keeps, and all leaves w[in by computation sequence] in;
D. implement protection at the fault wavelength on this link, search idle wavelength earlier, have then to substitute the fault wavelength, then do not utilize the lower wavelength of wavelength utilization rate to substitute the fault wavelength with idle wavelength.
2, guard method as claimed in claim 1 is characterized in that: the concrete steps that the fault wavelength described in the steps d is implemented protection are as follows:
Step 1: detect whether idle wavelength available is arranged in this link; If have, then selecting wherein, an available free wavelength substitutes transmission;
Step 2: if do not have, at array w[] in the wavelength utilization rate w[p of this fault wavelength of extraction], and at array w[] in backward search out have lowest wavelength utilization rate w[q] operation wavelength;
Step 3: judge w[p]＞w[q] whether set up; If be false, then protection failure; If set up, be w[q then with the wavelength utilization rate] operation wavelength replacement wavelength utilization rate be w[p] the fault wavelength transmit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100861739A CN101582718B (en) | 2009-06-12 | 2009-06-12 | Wavelength protection method based on wavelength utilization rate in single link |
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| CN2009100861739A CN101582718B (en) | 2009-06-12 | 2009-06-12 | Wavelength protection method based on wavelength utilization rate in single link |
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| CN101582718A true CN101582718A (en) | 2009-11-18 |
| CN101582718B CN101582718B (en) | 2011-09-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106464412A (en) * | 2014-06-03 | 2017-02-22 | 华为技术有限公司 | Optical packet sending method and device, processing method and optical switching device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101257352B (en) * | 2008-03-07 | 2012-08-22 | 北京大学 | ROF base station uplink of wavelength-division multiplex passive optical network and its system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106464412A (en) * | 2014-06-03 | 2017-02-22 | 华为技术有限公司 | Optical packet sending method and device, processing method and optical switching device |
| CN106464412B (en) * | 2014-06-03 | 2018-11-13 | 华为技术有限公司 | Sending method, equipment, processing method and the optical switching device of light packet |
| US10149025B2 (en) | 2014-06-03 | 2018-12-04 | Huawei Technologies Co., Ltd. | Optical packet sending method and device, optical packet processing method, and optical switching device |
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| CN101582718B (en) | 2011-09-21 |
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