CN102238060A - Routing method and apparatus thereof - Google Patents
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Abstract
Embodiments of the invention provide a routing method and an apparatus thereof. The method comprises the following steps: calculating a first reachable route of a wavelength service; acquiring a link attribute parameter in the first reachable route, wherein the link attribute parameter comprises a light amplifier parameter list and a OSNR threshold; calculating a first loss OSNR value of the first reachable route by using the light amplifier parameter list and calculating an end-to-end first OSNR value of the wavelength service; comparing the end-to-end first OSNR value of the wavelength service with the OSNR threshold, simulating and opening the wavelength service on the calculated first reachable route if the end-to-end first OSNR value of the wavelength service is greater than or equals to the OSNR threshold. The embodiments of the invention are mainly used for raising accuracy of wavelength division multiplexing (WDM) automatically switched optical network (ASON) fault simulation during wavelength-division-network long-line high-capacity transmission.
Description
Technical field
The present invention relates to communication technique field, relate in particular to a kind of route selection method and device.
Background technology
At WDM (Wavelength Division Multiplexing, wavelength division multiplexing) photosphere ASON (Automatically Switched Optical Network, ASON) in the equipment network, line fault when taking place in wavelength-division photosphere IN service, whether can recover transmission at other circuit by intelligent protocol influenced by following technical factor: the Wavelength dispatching ability and the optical link resource of a. photosphere WDM ASON equipment: after this factor decision IN service generation line fault, whether can make professional light signal accessibility optical channel between sourcesink in addition; B. optical parametric: professional light signal has damage through closing equipment and various Optical Fiber Transmission such as partial wave plate, image intensifer, if damage is too big, then professional receiving terminal can't normally receive.
Behavior when WDM ASON fault simulation is meant and breaks down with the mode emulation WDM ASON network equipments such as software or optical fiber behind business influenced comprises whether artificial service recovers the route of success and business recovery etc.Existing WDM ASON photosphere fault simulation supposes that light signal can arrive equipment, can normally receive.By the reached light path of software algorithm after trouble-shooting between the professional sourcesink of beeline or balance policy, with this can reach light path as the recovery way of escape of photosphere IN service by.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art: this method of prior art WDM ASON fault simulation can to short transmission distance, low capacity, service signal quality preferably network make approximate simulation, yet the mainstream applications scene of wavelength-division network all is the big volume transport of long transmission line, the Signal Degrade that long transmission line transmission and image intensifer are introduced often causes business can not normally receive on the optical channel that can reach, if still adopt the method simulation under this scene, the emulation accuracy is poor.
Summary of the invention
The embodiment of the invention provides a kind of route selection method and device, is mainly used in the accuracy of WDM ASON fault simulation when improving the big volume transport of wavelength-division network long transmission line.
On the one hand, the embodiment of the invention provides a kind of route selection method, and described method comprises: calculate first of wavelength business and can reach route; Obtain the above-mentioned first link attribute parameter that can reach in the route, above-mentioned link attribute parameter comprises image intensifer parameter list and Optical Signal To Noise Ratio OSNR threshold value; Utilize above-mentioned image intensifer parameter list to calculate the above-mentioned first first loss OSNR value that can reach route, and calculate an above-mentioned wavelength business OSNR value end to end according to the above-mentioned first loss OSNR value; More above-mentioned wavelength business is the size of an OSNR value and above-mentioned OSNR threshold value end to end, if an above-mentioned wavelength business OSNR value end to end then above-mentioned first can reach on the route the above-mentioned wavelength business of opening of simulating what calculate more than or equal to above-mentioned OSNR threshold value.
On the other hand, the embodiment of the invention provides a kind of routing arrangement, and described device comprises: route computing unit is used to calculate first of wavelength business and can reaches route; Parameter acquiring unit is used for obtaining the above-mentioned first link attribute parameter that can reach route, and above-mentioned link attribute parameter comprises image intensifer parameter list and Optical Signal To Noise Ratio OSNR threshold value; OSNR value computing unit is used to utilize above-mentioned image intensifer parameter list to calculate the above-mentioned first first loss OSNR value that can reach route, and calculates an above-mentioned wavelength business OSNR value end to end according to the above-mentioned first loss OSNR value; Comparing unit is used for the more above-mentioned wavelength business size of an OSNR value and above-mentioned OSNR threshold value end to end; The Route Selection unit, be used for if above-mentioned wavelength business end to end an OSNR value then above-mentioned first can reach on the route the above-mentioned wavelength business of opening of simulating more than or equal to above-mentioned OSNR threshold value what calculate.
Technique scheme has following beneficial effect: adopt by assessing the influence that the link attribute parameter receives business more exactly, adopt the link attribute calculation of parameter to select to reach the technological means of route, be mainly used in the accuracy of WDM ASON fault simulation when improving the big volume transport of wavelength-division network long transmission line, come with low-cost simplation examination network performance.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is an embodiment of the invention link model abstract schematic;
Fig. 2 is the embodiment of the invention one a route selection method flow chart;
Fig. 3 is the embodiment of the invention two route selection method flow charts;
Fig. 4 is the embodiment of the invention three route selection method flow charts;
Fig. 5 is the embodiment of the invention four route selection method flow charts;
Fig. 6 is the embodiment of the invention five routing arrangement structural representations;
Fig. 7 is an application example Route Selection schematic diagram of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The embodiment of the invention is considered the influence that the link attribute parameter receives business in the simulation of wavelength-division photosphere, to improve the accuracy of WDM ASON fault simulation.At first with the resource of carrying wavelength business in the network abstract be link, to add up the link property parameters.The wavelength-division light path is divided into two kinds of main optical path and Zhi Guanglu, and the ripple signal is closed in the main optical path transmission, and single ripple signal of an optic path or wave number are closed the ripple signal than what the circuit maximum closed that wave number lacks.Link mainly is divided into 2 classes, OTS (Optical Transmission Section, optical transmission section) link and service link up and down.The optics of the process of main optical path is described with " OTS link ", the optics of the process of Zhi Guanglu is described with " service link up and down ".Details are as follows for the link attribute parameter of abstract mode of model and statistics:
The OTS link:
As shown in Figure 1, be embodiment of the invention link model abstract schematic, closing the transmission ends of ripple signal (for example between website A and website or between website B and website C) wavelength-division between two websites in the network topology abstract is two OTS link, counts source OTS link, place OTS link respectively.Two OTS links of sourcesink are associated, and are used to represent that wavelength-division closes the ripple signal and can be transferred to another OTS link through wherein OTS link the time.
As shown in table 1 below, be the link attribute parameter of adding for OTS link model, be used to describe wavelength-division and close of the various optical parametric influences of ripple signal through this OTS link, wherein " image intensifer parameter list " is the crucial factor of considering, is necessary attribute.
| The OTS link attribute | Attribute specification |
| Distance | The fiber lengths of circuit transmission is described |
| Abbe number | Describe the optical dispersion effect coefficient of circuit transmission, being closed the ripple transmission line influences |
| PMD (Polarization Mode Dispersion, polarization mode dispersion) coefficient | Describe the polarization mode dispersion coefficient of circuit transmission, being closed the ripple transmission line influences |
| Fiber type | Dissimilar optical fiber is different with degree to the type of impairment of light signal generating |
| Incident optical power | OSNR (Optical Signal-to-noise Ratio, the Optical Signal To Noise Ratio) damage of ripple signal is closed in influence |
| The dispersion compensation tabulation | Each time compensation rate of the continuous several times dispersion compensation that the ripple signal is subjected to is closed in description |
| The image intensifer parameter list | Each time optical noise coefficient that the ripple signal amplifies through the continuous several times light signal is closed in description, glistening light of waves power is closed in the nominal that reaches image intensifer |
| PDL (Polarization Dependent Loss, Polarization Dependent Loss) parameter list | The statistic of classification respectively of the influential device number of involutory ripple PDL |
The link attribute parameter of table 1 OTS link model
Service link up and down:
In website, close ripple a corresponding service link up and down, corresponding link of the light signal of a business of generating of every professional light signal to the OTS link.Service link can reach to corresponding OTS link up and down.As shown in table 2 below, for giving the link attribute parameter of service link model interpolation up and down, single ripple service signal can be described through these various optical parametric influences of service link up and down, wherein the OSNR threshold value is a key factor, is necessary attribute:
| Service link attribute up and down | Attribute specification |
| The chromatic dispersion threshold value | The chromatic dispersion thresholding that wavelength conversion unit is collected mail number is described |
| The OSNR threshold value | The OSNR threshold value of wavelength conversion unit is described |
| Signal rate | Describe single wave speed, single wave speed is big more high more to the transmission optics parameter request |
| The Wavelength-encoding type | Under the various wavelength sign indicating number types, there is difference in the light signal damage that wavelength is subjected to |
| The image intensifer parameter list | Each time optical noise coefficient that single ripple signal amplifies through the continuous several times light signal, and the nominal list glistening light of waves power of image intensifer are described |
Table 2 is the link attribute parameter of service link model up and down
OTS link and service link model have up and down embodied the various annexations of the professional transmitting-receiving point of wavelength-division network on the one hand, and the professional end-to-end transmission of wavelength-division can be regarded as at the OTS link and transmits on the service link up and down; On the other hand by the OTS link of professional route process and service link up and down, the above-mentioned link attribute of routing link can be combined again as the factor of the professional light signal of influence damage (OTS link and the relevant link property parameters of service link need the user to be input in the simulation softward in advance) up and down, be used for the subsequent step of analog simulation.
As shown in Figure 2, be the embodiment of the invention one route selection method flow chart, described method comprises:
201, calculate first of wavelength business and can reach route.
Can calculate reached at the route of the back wavelength business that breaks down, also can calculate before fault or in the system initialization, the embodiment of the invention is not as limit.
Optionally, reached at the route of wavelength business can comprise: reached at the route of utilizing nomography simulation calculation wavelength business after aforementioned calculation broke down; Wherein, above-mentioned nomography comprises to be used shortest path calculation road strategy or all accounts the road strategy, and above-mentioned shortest path is calculated the road strategy and comprised the Di Jieshitela algorithm.
202, obtain the above-mentioned first link attribute parameter that can reach in the route, above-mentioned link attribute parameter comprises image intensifer parameter list and Optical Signal To Noise Ratio OSNR threshold value.
Need to prove, reached at route herein by above-mentioned source OTS link, place OTS link and up and down service link form.
203, utilize above-mentioned image intensifer parameter list to calculate the above-mentioned first first loss OSNR value that can reach route, and calculate an above-mentioned wavelength business OSNR value end to end according to the above-mentioned first loss OSNR value.
Original OSNR value-loss OSNR value=wavelength business is the OSNR value end to end, and original OSNR value generally is the fixed value of presetting, and can directly use this value.
204, the more above-mentioned wavelength business size of an OSNR value and above-mentioned OSNR threshold value end to end, if an above-mentioned wavelength business OSNR value end to end then above-mentioned first can reach on the route the above-mentioned wavelength business of opening of simulating what calculate more than or equal to above-mentioned OSNR threshold value.
If an above-mentioned wavelength business OSNR value end to end then as shown in Figure 3, is the embodiment of the invention two route selection method flow charts less than above-mentioned OSNR threshold value, this method not only comprises above-mentioned steps 201-203, also comprises:
305, if above-mentioned wavelength business end to end an OSNR value then calculate above-mentioned wavelength business and second of minimum weights correspondence can reach route in the weights end to end less than above-mentioned OSNR threshold value; Wherein, above-mentioned weights are for the absolute value weighted calculation acquisition of the chromatic dispersion cumulative amount of the loss OSNR value by each link and above-mentioned each link; Above-mentioned loss OSNR value is to obtain by the image intensifer parameter list calculating of above-mentioned each link that obtains; Above-mentioned chromatic dispersion cumulative amount is to calculate and obtain by the abbe number of above-mentioned each link that obtains, dispersion compensation tabulation, distance calculation; Above-mentioned wavelength business end to end weights for the weights addition calculation acquisition by the professional link in end-to-end of above-mentioned wavelength; Owing to do not consider dispersion measure, its weight can be seen as 0% herein, and above-mentioned wavelength business end to end the weight of loss OSNR value can be seen as 100%.
306, obtain the above-mentioned second image intensifer parameter list that can reach in the route.
307, utilize above-mentioned second can reach image intensifer parameter list in the route and calculate the above-mentioned second second loss OSNR value that can reach route, and calculate above-mentioned wavelength business the 2nd OSNR value end to end according to the above-mentioned second loss OSNR value.
308, the more above-mentioned wavelength business size of the 2nd OSNR value and above-mentioned OSNR threshold value end to end, if above-mentioned wavelength business the 2nd OSNR value end to end then above-mentioned second can reach on the route the above-mentioned wavelength business of opening of simulating what calculate more than or equal to above-mentioned OSNR threshold value.Otherwise above-mentioned wavelength business is interrupted in the back of breaking down.
Above-mentioned two method embodiment have only considered two necessary link property parameters (image intensifer parameter list and Optical Signal To Noise Ratio OSNR threshold value), if consider other link attribute parameters, then as shown in Figure 4, be the embodiment of the invention three route selection method flow charts, this method comprises:
401, calculate first of wavelength business and can reach route.
Optionally, reached at the route of wavelength business can comprise: reached at the route of utilizing nomography simulation calculation wavelength business after aforementioned calculation broke down; Wherein, above-mentioned nomography comprises to be used shortest path calculation road strategy or all accounts the road strategy, and above-mentioned shortest path is calculated the road strategy and comprised the Di Jieshitela algorithm.
402, obtain the above-mentioned first link attribute parameter that can reach in the route, obtain the link attribute parameter the routing link end to end from above-mentioned wavelength business, above-mentioned link attribute parameter comprises image intensifer parameter list and Optical Signal To Noise Ratio OSNR threshold value, and above-mentioned link attribute parameter also comprises: abbe number, dispersion compensation tabulation, distance, chromatic dispersion threshold value, polarization mode dispersion PMD coefficient, fiber type, polarized dependent loss PDL parameter list, signal rate, Wavelength-encoding type.
403, utilize above-mentioned image intensifer parameter list to calculate the above-mentioned first first loss OSNR value that can reach route, and utilize above-mentioned PMD coefficient, fiber type, PDL parameter list, signal rate, Wavelength-encoding type to calculate the above-mentioned first OSNR cost value that can reach route, obtain above-mentioned wavelength business the 3rd OSNR value end to end by above-mentioned first loss OSNR value and above-mentioned OSNR cost value then; Utilize above-mentioned abbe number, dispersion compensation tabulation, distance calculation above-mentioned first can reach the chromatic dispersion cumulative amount of route.
404, the more above-mentioned wavelength business size of the 3rd OSNR value and above-mentioned OSNR threshold value end to end, and more above-mentioned first can reach the absolute value of chromatic dispersion cumulative amount of route and the size of above-mentioned chromatic dispersion threshold value, if above-mentioned wavelength business end to end the 3rd OSNR value more than or equal to above-mentioned OSNR threshold value, and above-mentioned first absolute value that can reach the chromatic dispersion cumulative amount of route is less than or equal to above-mentioned chromatic dispersion threshold value, then above-mentioned first can reach on the route simulation and opens above-mentioned wavelength business what calculate.
If above-mentioned wavelength business end to end the 3rd OSNR value less than above-mentioned OSNR threshold value, perhaps above-mentioned first can reach the absolute value of chromatic dispersion cumulative amount of route greater than above-mentioned chromatic dispersion threshold value, then as shown in Figure 5, be the embodiment of the invention four route selection method flow charts, this method not only comprises above-mentioned steps 401-403, also comprises:
505, if above-mentioned wavelength business end to end the 3rd OSNR value less than above-mentioned OSNR threshold value, the perhaps above-mentioned wavelength business absolute value of chromatic dispersion cumulative amount is end to end then calculated above-mentioned wavelength business and the 3rd of minimum weights correspondence the can be reached route in the weights end to end greater than above-mentioned chromatic dispersion threshold value; Wherein, above-mentioned weights are for the absolute value weighted calculation acquisition of the chromatic dispersion cumulative amount of the loss OSNR value by each link and above-mentioned each link; Above-mentioned loss OSNR value is to obtain by the image intensifer parameter list calculating of above-mentioned each link that obtains; Above-mentioned chromatic dispersion cumulative amount is to calculate and obtain by the abbe number of above-mentioned each link that obtains, dispersion compensation tabulation, distance calculation; Above-mentioned wavelength business end to end weights for the weights addition calculation acquisition by the professional link in end-to-end of above-mentioned wavelength.
506, obtain the above-mentioned the 3rd link attribute parameter that can reach route, above-mentioned link attribute parameter comprises the image intensifer parameter list, and above-mentioned link attribute parameter also comprises: abbe number, dispersion compensation tabulation, distance, chromatic dispersion threshold value, polarization mode dispersion PMD coefficient, fiber type, polarized dependent loss PDL parameter list, signal rate, Wavelength-encoding type.
507, utilize above-mentioned image intensifer parameter list to calculate the above-mentioned the 3rd the 3rd loss OSNR value that can reach route, and utilize above-mentioned PMD coefficient, fiber type, PDL parameter list, signal rate, Wavelength-encoding type to calculate above-mentioned wavelength business OSNR cost value end to end, obtain above-mentioned wavelength business the 4th OSNR value end to end by above-mentioned the 3rd loss OSNR value and above-mentioned OSNR cost value then; Utilize above-mentioned abbe number, dispersion compensation tabulation, distance calculation the above-mentioned the 3rd can reach the chromatic dispersion cumulative amount of route.
508, the more above-mentioned wavelength business size of the 4th OSNR value and above-mentioned OSNR threshold value end to end, and the more above-mentioned the 3rd can reach the absolute value of chromatic dispersion cumulative amount of route and the size of above-mentioned chromatic dispersion threshold value, if above-mentioned wavelength business end to end the 4th OSNR value more than or equal to above-mentioned OSNR threshold value, and the above-mentioned the 3rd absolute value that can reach the chromatic dispersion cumulative amount of route is less than or equal to above-mentioned chromatic dispersion threshold value, then the above-mentioned the 3rd can reach on the route simulation and opens above-mentioned wavelength business what calculate.
Embodiment of the invention said method technical scheme is by assessing the influence that the link attribute parameter receives business more exactly, adopt the link attribute calculation of parameter to select to reach route, be mainly used in the accuracy of WDM ASON fault simulation when improving the big volume transport of wavelength-division network long transmission line, come with low-cost simplation examination network performance.
Corresponding to the described scheme of said method embodiment, as shown in Figure 6, be the embodiment of the invention five routing arrangement structural representations, described device comprises:
OSNR value computing unit 603 is used to utilize above-mentioned image intensifer parameter list to calculate the above-mentioned first first loss OSNR value that can reach route, and calculates an above-mentioned wavelength business OSNR value end to end according to the above-mentioned first loss OSNR value;
Comparing unit 604 is used for the more above-mentioned wavelength business size of an OSNR value and above-mentioned OSNR threshold value end to end;
Optionally, above-mentioned route computing unit 601 further can be used to utilize reached at the route of nomography simulation calculation wavelength business; Wherein, above-mentioned nomography can comprise to be used shortest path calculation road strategy or all accounts the road strategy, and above-mentioned shortest path is calculated the road strategy can comprise the Di Jieshitela algorithm.
Optionally, above-mentioned route computing unit 601, also be used for if above-mentioned wavelength business end to end an OSNR value then calculate above-mentioned wavelength business and second of minimum weights correspondence can reach route in the weights end to end less than above-mentioned OSNR threshold value; Wherein, above-mentioned weights are for the absolute value weighted calculation acquisition of the chromatic dispersion cumulative amount of the loss OSNR value by each link and above-mentioned each link; Above-mentioned loss OSNR value is to obtain by the image intensifer parameter list calculating of above-mentioned each link that obtains; Above-mentioned chromatic dispersion cumulative amount is to calculate and obtain by the abbe number of above-mentioned each link that obtains, dispersion compensation tabulation, distance calculation; Above-mentioned wavelength business end to end weights for the weights addition calculation acquisition by the professional link in end-to-end of above-mentioned wavelength; Above-mentioned parameter acquiring unit 602 also is used for obtaining the above-mentioned second image intensifer parameter list that can reach route; Above-mentioned OSNR value computing unit 603, also be used for utilizing the above-mentioned second image intensifer parameter list that can reach route to calculate the above-mentioned second second loss OSNR value that can reach route, and calculate above-mentioned wavelength business the 2nd OSNR value end to end according to the above-mentioned second loss OSNR value; Above-mentioned comparing unit 604 also is used for the more above-mentioned wavelength business size of the 2nd OSNR value and above-mentioned OSNR threshold value end to end; Above-mentioned Route Selection unit 605, also be used for if above-mentioned wavelength business end to end the 2nd OSNR value then above-mentioned second can reach on the route the above-mentioned wavelength business of opening of simulating more than or equal to above-mentioned OSNR threshold value what calculate.
Optionally, above-mentioned link attribute parameter also comprises: abbe number, the dispersion compensation tabulation, distance, the chromatic dispersion threshold value, polarization mode dispersion PMD coefficient, fiber type, the polarized dependent loss PDL parameter list, signal rate, the Wavelength-encoding type, above-mentioned OSNR value computing unit 603, be further used for utilizing above-mentioned image intensifer parameter list to calculate the above-mentioned first first loss OSNR value that can reach route, and utilize above-mentioned PMD coefficient, fiber type, the PDL parameter list, signal rate, the Wavelength-encoding type is calculated the above-mentioned first OSNR cost value that can reach route, obtains above-mentioned wavelength business the 3rd OSNR value end to end by above-mentioned first loss OSNR value and above-mentioned OSNR cost value then; Said apparatus also comprises: chromatic dispersion computing unit 606 is used to utilize above-mentioned abbe number, dispersion compensation tabulation, distance calculation above-mentioned first can reach the chromatic dispersion cumulative amount of route.Above-mentioned comparing unit 604 is used for the more above-mentioned wavelength business size of the 3rd OSNR value and above-mentioned OSNR threshold value end to end, and more above-mentioned first can reach the absolute value of chromatic dispersion cumulative amount of route and the size of above-mentioned chromatic dispersion threshold value; Above-mentioned Route Selection unit 605, be further used for if above-mentioned wavelength business end to end the 3rd OSNR value more than or equal to above-mentioned OSNR threshold value, and above-mentioned first absolute value that can reach the chromatic dispersion cumulative amount of route is less than or equal to above-mentioned chromatic dispersion threshold value, then above-mentioned first can reach on the route simulation and opens above-mentioned wavelength business what calculate.
Optionally, above-mentioned route computing unit 601, also be used for if above-mentioned wavelength business end to end the 3rd OSNR value less than above-mentioned OSNR threshold value, perhaps above-mentioned first absolute value of chromatic dispersion cumulative amount that can reach route is greater than above-mentioned chromatic dispersion threshold value, then calculates above-mentioned wavelength business and the 3rd of minimum weights correspondence the can reach route in the weights end to end; Wherein, above-mentioned weights are for the absolute value weighted calculation acquisition of the chromatic dispersion cumulative amount of the loss OSNR value by each link and above-mentioned each link; Above-mentioned loss OSNR value is to obtain by the image intensifer parameter list calculating of above-mentioned each link that obtains; Above-mentioned chromatic dispersion cumulative amount is to calculate and obtain by the abbe number of above-mentioned each link that obtains, dispersion compensation tabulation, distance calculation; Above-mentioned wavelength business end to end weights for the weights addition calculation acquisition by the professional link in end-to-end of above-mentioned wavelength; Above-mentioned parameter acquiring unit 602, also be used to obtain the above-mentioned the 3rd link attribute parameter that can reach route, above-mentioned link attribute parameter comprises the image intensifer parameter list, and above-mentioned link attribute parameter also comprises: abbe number, dispersion compensation tabulation, distance, chromatic dispersion threshold value, polarization mode dispersion PMD coefficient, fiber type, polarized dependent loss PDL parameter list, signal rate, Wavelength-encoding type; Above-mentioned OSNR value computing unit 603, also be used to utilize above-mentioned image intensifer parameter list to calculate the above-mentioned the 3rd the 3rd loss OSNR value that can reach route, and utilize above-mentioned PMD coefficient, fiber type, PDL parameter list, signal rate, Wavelength-encoding type to calculate above-mentioned wavelength business OSNR cost value end to end, obtain above-mentioned wavelength business the 4th OSNR value end to end by above-mentioned the 3rd loss OSNR value and above-mentioned OSNR cost value then; Above-mentioned chromatic dispersion computing unit 606 also is used to utilize above-mentioned abbe number, dispersion compensation tabulation, distance calculation the above-mentioned the 3rd can reach the chromatic dispersion cumulative amount of route; Above-mentioned comparing unit 604 also is used for the more above-mentioned wavelength business size of the 4th OSNR value and above-mentioned OSNR threshold value end to end, and the more above-mentioned the 3rd can reach the absolute value of chromatic dispersion cumulative amount of route and the size of above-mentioned chromatic dispersion threshold value; Above-mentioned Route Selection unit 605, also be used for if above-mentioned wavelength business end to end the 4th OSNR value more than or equal to above-mentioned OSNR threshold value, and the above-mentioned the 3rd absolute value that can reach the chromatic dispersion cumulative amount of route is less than or equal to above-mentioned chromatic dispersion threshold value, then the above-mentioned the 3rd can reach on the route simulation and opens above-mentioned wavelength business what calculate.
As shown in Figure 7, be application example Route Selection schematic diagram of the present invention, the line length between A, B, each website of C, D is: A-B:20km; A-C:40km; A-D:80km; B-D:90km; C-D:100km.For simple description, be transmitted as example with one way traffic, the initial end to end OSNR value of wavelength business is 60dB, and the OSNR threshold value is different for different business, but also can be identical, and application example hypothesis OSNR threshold value of the present invention is 20dB.Suppose to have the professional x of a wavelength need simulate open-minded, former routed path is A-C-D, if the C website breaks down, according to prior art, such result may appear, select A-D (80km) as the heavy-route path by calculating the professional x of wavelength, perhaps the professional x of wavelength selects another routed path A-B-D (110km) as the heavy-route path:
If the professional x of wavelength directly selects A-B-D (110km) as the heavy-route path, then obtain the link attribute parameter in the above-mentioned A-B-D link, above-mentioned link attribute parameter comprises image intensifer parameter list and Optical Signal To Noise Ratio OSNR threshold value (20dB), utilizes image intensifer parameter list among the above-mentioned route A-B-D to calculate the loss OSNR value (A-B:17dB of above-mentioned route A-B-D; B-D:20dB), and according to above-mentioned loss OSNR value calculate above-mentioned wavelength business end to end the OSNR value be 60dB-17dB-20dB=23dB, 20dB is big than the OSNR threshold value, can go up simulation and opens the professional x of above-mentioned wavelength at the above-mentioned route A-B-D (110km) that reaches that calculates;
If the professional x of wavelength selects A-D (80km) as the heavy-route path, then obtain the link attribute parameter in the above-mentioned A-D link, above-mentioned link attribute parameter comprises image intensifer parameter list and Optical Signal To Noise Ratio OSNR threshold value (20dB); Utilize above-mentioned image intensifer parameter list to calculate the above-mentioned loss OSNR value (42.1dB) that reaches route A-D link, and calculate above-mentioned wavelength business OSNR value end to end according to above-mentioned loss OSNR value (42.1dB), at this moment, the end-to-end OSNR value of x business is 60dB-42.1dB=17.9dB, 20dB is little than the OSNR threshold value, the x business can't be opened, then calculate above-mentioned wavelength business end to end minimum weights in the weights (wherein, above-mentioned weights are for the absolute value weighted calculation acquisition of the chromatic dispersion cumulative amount of the loss OSNR value by each link and above-mentioned each link; Above-mentioned loss OSNR value is to obtain by the image intensifer parameter list calculating of above-mentioned each link that obtains; Above-mentioned chromatic dispersion cumulative amount is to calculate and obtain by the abbe number of above-mentioned each link that obtains, dispersion compensation tabulation, distance calculation; Above-mentioned wavelength business end to end weights for the weights addition calculation acquisition by the professional link in end-to-end of above-mentioned wavelength; Herein owing to do not consider dispersion measure, its weight can be seen as 0%, and above-mentioned wavelength business end to end the weight of loss OSNR value can be seen as 100%, that is this moment can be in the hope of minimal losses OSNR value in the loss OSNR value) another reached at route A-B-D (110km) of correspondence is as the heavy-route path, then obtain the link attribute parameter in the above-mentioned A-B-D link, above-mentioned link attribute parameter comprises the image intensifer parameter list, utilizes image intensifer parameter list among the above-mentioned route A-B-D to calculate the loss OSNR value (A-B:17dB of above-mentioned route A-B-D; B-D:20dB), and according to the above-mentioned second loss OSNR value calculate above-mentioned wavelength business end to end the 2nd OSNR value be 60dB-17dB-20dB=23dB, 20dB is big than the OSNR threshold value, can reach the last simulation of route A-B-D (110km) at above-mentioned another that calculates and open the professional x of above-mentioned wavelength.
As fully visible, application example service analogue accuracy of the present invention is about 100%, probably is higher than existing wavelength service analogue accuracy 50%.
Embodiment of the invention said apparatus technical scheme is by assessing the influence that the link attribute parameter receives business more exactly, adopt the link attribute calculation of parameter to select to reach route, be mainly used in the accuracy of WDM ASON fault simulation when improving the big volume transport of wavelength-division network long transmission line, come with low-cost simplation examination network performance.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct related hardware to finish by program, described program can be stored in the computer read/write memory medium, this program is when carrying out, comprise above-mentioned all or part of step, described storage medium, as: ROM/RAM, disk, CD etc.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a route selection method is characterized in that, described method comprises:
Calculate first of wavelength business and can reach route;
Obtain the described first link attribute parameter that can reach in the route, described link attribute parameter comprises image intensifer parameter list and Optical Signal To Noise Ratio OSNR threshold value;
Utilize described image intensifer parameter list to calculate the described first first loss OSNR value that can reach route, and calculate a described wavelength business OSNR value end to end according to the described first loss OSNR value;
More described wavelength business is the size of an OSNR value and described OSNR threshold value end to end, if a described wavelength business OSNR value end to end then described first can reach on the route the described wavelength business of opening of simulating what calculate more than or equal to described OSNR threshold value.
2. method according to claim 1 is characterized in that reached at the route of described calculating wavelength business comprises:
Utilize reached at the route of nomography simulation calculation wavelength business; Wherein, described nomography comprises to be used shortest path calculation road strategy or all accounts the road strategy, and described shortest path is calculated the road strategy and comprised the Di Jieshitela algorithm.
3. method as claimed in claim 1 or 2 is characterized in that described method also comprises:
If a described wavelength business OSNR value is end to end then calculated described wavelength business and second of minimum weights correspondence can be reached route in the weights end to end less than described OSNR threshold value; Wherein, described weights are for the absolute value weighted calculation acquisition of the chromatic dispersion cumulative amount of the loss OSNR value by each link and described each link; Described loss OSNR value is to obtain by the image intensifer parameter list calculating of described each link that obtains; Described chromatic dispersion cumulative amount is to calculate and obtain by the abbe number of described each link that obtains, dispersion compensation tabulation, distance calculation; Described wavelength business end to end weights for the weights addition calculation acquisition by the professional link in end-to-end of described wavelength;
Obtain the described second image intensifer parameter list that can reach in the route;
Utilize described second can reach image intensifer parameter list in the route and calculate the described second second loss OSNR value that can reach route, and calculate described wavelength business the 2nd OSNR value end to end according to the described second loss OSNR value;
More described wavelength business is the size of the 2nd OSNR value and described OSNR threshold value end to end, if described wavelength business the 2nd OSNR value end to end then described second can reach on the route the described wavelength business of opening of simulating what calculate more than or equal to described OSNR threshold value.
4. method according to claim 1, it is characterized in that, described link attribute parameter also comprises: abbe number, dispersion compensation tabulation, distance, chromatic dispersion threshold value, polarization mode dispersion PMD coefficient, fiber type, polarized dependent loss PDL parameter list, signal rate, Wavelength-encoding type
Utilize described image intensifer parameter list to calculate the described first first loss OSNR value that can reach route, and utilize described PMD coefficient, fiber type, PDL parameter list, signal rate, Wavelength-encoding type to calculate the described first OSNR cost value that can reach route, obtain described wavelength business the 3rd OSNR value end to end by described first loss OSNR value and described OSNR cost value then; Utilize described abbe number, dispersion compensation tabulation, distance calculation described first can reach the chromatic dispersion cumulative amount of route;
Described wavelength business is the size of an OSNR value and described OSNR threshold value end to end, if described wavelength business end to end an OSNR value more than or equal to described OSNR threshold value, then described first can reach on the route simulation and open described wavelength business, comprise what calculate:
More described wavelength business is the size of the 3rd OSNR value and described OSNR threshold value end to end, and more described first can reach the absolute value of chromatic dispersion cumulative amount of route and the size of described chromatic dispersion threshold value, if described wavelength business end to end the 3rd OSNR value more than or equal to described OSNR threshold value, and described first absolute value that can reach the chromatic dispersion cumulative amount of route is less than or equal to described chromatic dispersion threshold value, then described first can reach on the route simulation and opens described wavelength business what calculate.
5. as method as described in the claim 4, it is characterized in that described method also comprises:
If described wavelength business end to end the 3rd OSNR value less than described OSNR threshold value, the perhaps described wavelength business absolute value of chromatic dispersion cumulative amount is end to end then calculated described wavelength business and the 3rd of minimum weights correspondence the can be reached route in the weights end to end greater than described chromatic dispersion threshold value; Wherein, described weights are for the absolute value weighted calculation acquisition of the chromatic dispersion cumulative amount of the loss OSNR value by each link and described each link; Described loss OSNR value is to obtain by the image intensifer parameter list calculating of described each link that obtains; Described chromatic dispersion cumulative amount is to calculate and obtain by the abbe number of described each link that obtains, dispersion compensation tabulation, distance calculation; Described wavelength business end to end weights for the weights addition calculation acquisition by the professional link in end-to-end of described wavelength;
Obtain the described the 3rd link attribute parameter that can reach route, described link attribute parameter comprises the image intensifer parameter list, and described link attribute parameter also comprises: abbe number, dispersion compensation tabulation, distance, chromatic dispersion threshold value, polarization mode dispersion PMD coefficient, fiber type, polarized dependent loss PDL parameter list, signal rate, Wavelength-encoding type;
Utilize described image intensifer parameter list to calculate the described the 3rd the 3rd loss OSNR value that can reach route, and utilize described PMD coefficient, fiber type, PDL parameter list, signal rate, Wavelength-encoding type to calculate described wavelength business OSNR cost value end to end, obtain described wavelength business the 4th OSNR value end to end by described the 3rd loss OSNR value and described OSNR cost value then; Utilize described abbe number, dispersion compensation tabulation, distance calculation the described the 3rd can reach the chromatic dispersion cumulative amount of route;
More described wavelength business is the size of the 4th OSNR value and described OSNR threshold value end to end, and the more described the 3rd can reach the absolute value of chromatic dispersion cumulative amount of route and the size of described chromatic dispersion threshold value, if described wavelength business end to end the 4th OSNR value more than or equal to described OSNR threshold value, and the described the 3rd absolute value that can reach the chromatic dispersion cumulative amount of route is less than or equal to described chromatic dispersion threshold value, then the described the 3rd can reach on the route simulation and opens described wavelength business what calculate.
6. a routing arrangement is characterized in that, described device comprises:
Route computing unit is used to calculate first of wavelength business and can reaches route;
Parameter acquiring unit is used for obtaining the described first link attribute parameter that can reach route, and described link attribute parameter comprises image intensifer parameter list and Optical Signal To Noise Ratio OSNR threshold value;
OSNR value computing unit is used to utilize described image intensifer parameter list to calculate the described first first loss OSNR value that can reach route, and calculates a described wavelength business OSNR value end to end according to the described first loss OSNR value;
Comparing unit is used for the more described wavelength business size of an OSNR value and described OSNR threshold value end to end;
The Route Selection unit, be used for if described wavelength business end to end an OSNR value then described first can reach on the route the described wavelength business of opening of simulating more than or equal to described OSNR threshold value what calculate.
7. as device as described in the claim 6, it is characterized in that described route computing unit is further used for utilizing reached at the route of nomography simulation calculation wavelength business; Wherein, described nomography comprises to be used shortest path calculation road strategy or all accounts the road strategy, and described shortest path is calculated the road strategy and comprised the Di Jieshitela algorithm.
8. as device as described in claim 6 or 7, it is characterized in that,
Described route computing unit, also be used for if described wavelength business end to end an OSNR value then calculate described wavelength business and second of minimum weights correspondence can reach route in the weights end to end less than described OSNR threshold value; Wherein, described weights are for the absolute value weighted calculation acquisition of the chromatic dispersion cumulative amount of the loss OSNR value by each link and described each link; Described loss OSNR value is to obtain by the image intensifer parameter list calculating of described each link that obtains; Described chromatic dispersion cumulative amount is to calculate and obtain by the abbe number of described each link that obtains, dispersion compensation tabulation, distance calculation; Described wavelength business end to end weights for the weights addition calculation acquisition by the professional link in end-to-end of described wavelength;
Described parameter acquiring unit also is used for obtaining the described second image intensifer parameter list that can reach route;
Described OSNR value computing unit, also be used for utilizing the described second image intensifer parameter list that can reach route to calculate the described second second loss OSNR value that can reach route, and calculate described wavelength business the 2nd OSNR value end to end according to the described second loss OSNR value;
Described comparing unit also is used for the more described wavelength business size of the 2nd OSNR value and described OSNR threshold value end to end;
Described Route Selection unit, also be used for if described wavelength business end to end the 2nd OSNR value then described second can reach on the route the described wavelength business of opening of simulating more than or equal to described OSNR threshold value what calculate.
9. as device as described in the claim 6, it is characterized in that, described link attribute parameter also comprises: abbe number, dispersion compensation tabulation, distance, chromatic dispersion threshold value, polarization mode dispersion PMD coefficient, fiber type, polarized dependent loss PDL parameter list, signal rate, Wavelength-encoding type
Described OSNR value computing unit, be further used for utilizing described image intensifer parameter list to calculate the described first first loss OSNR value that can reach route, and utilize described PMD coefficient, fiber type, PDL parameter list, signal rate, Wavelength-encoding type to calculate the described first OSNR cost value that can reach route, obtain described wavelength business the 3rd OSNR value end to end by described first loss OSNR value and described OSNR cost value then;
Described device also comprises: the chromatic dispersion computing unit is used to utilize described abbe number, dispersion compensation tabulation, distance calculation described first can reach the chromatic dispersion cumulative amount of route;
Described comparing unit is used for the more described wavelength business size of the 3rd OSNR value and described OSNR threshold value end to end, and more described first can reach the absolute value of chromatic dispersion cumulative amount of route and the size of described chromatic dispersion threshold value;
Described Route Selection unit, be further used for if described wavelength business end to end the 3rd OSNR value more than or equal to described OSNR threshold value, and described first absolute value that can reach the chromatic dispersion cumulative amount of route is less than or equal to described chromatic dispersion threshold value, then described first can reach on the route simulation and opens described wavelength business what calculate.
10. as device as described in the claim 9, it is characterized in that,
Described route computing unit, also be used for if described wavelength business end to end the 3rd OSNR value less than described OSNR threshold value, perhaps described first absolute value of chromatic dispersion cumulative amount that can reach route is greater than described chromatic dispersion threshold value, then calculates described wavelength business and the 3rd of minimum weights correspondence the can reach route in the weights end to end; Wherein, described weights are for the absolute value weighted calculation acquisition of the chromatic dispersion cumulative amount of the loss OSNR value by each link and described each link; Described loss OSNR value is to obtain by the image intensifer parameter list calculating of described each link that obtains; Described chromatic dispersion cumulative amount is to calculate and obtain by the abbe number of described each link that obtains, dispersion compensation tabulation, distance calculation; Described wavelength business end to end weights for the weights addition calculation acquisition by the professional link in end-to-end of described wavelength;
Described parameter acquiring unit, also be used to obtain the described the 3rd link attribute parameter that can reach route, described link attribute parameter comprises the image intensifer parameter list, and described link attribute parameter also comprises: abbe number, dispersion compensation tabulation, distance, chromatic dispersion threshold value, polarization mode dispersion PMD coefficient, fiber type, polarized dependent loss PDL parameter list, signal rate, Wavelength-encoding type;
Described OSNR value computing unit, also be used to utilize described image intensifer parameter list to calculate the described the 3rd the 3rd loss OSNR value that can reach route, and utilize described PMD coefficient, fiber type, PDL parameter list, signal rate, Wavelength-encoding type to calculate described wavelength business OSNR cost value end to end, obtain described wavelength business the 4th OSNR value end to end by described the 3rd loss OSNR value and described OSNR cost value then;
Described chromatic dispersion computing unit also is used to utilize described abbe number, dispersion compensation tabulation, distance calculation the described the 3rd can reach the chromatic dispersion cumulative amount of route;
Described comparing unit also is used for the more described wavelength business size of the 4th OSNR value and described OSNR threshold value end to end, and the more described the 3rd can reach the absolute value of chromatic dispersion cumulative amount of route and the size of described chromatic dispersion threshold value;
Described Route Selection unit, also be used for if described wavelength business end to end the 4th OSNR value more than or equal to described OSNR threshold value, and the described the 3rd absolute value that can reach the chromatic dispersion cumulative amount of route is less than or equal to described chromatic dispersion threshold value, then the described the 3rd can reach on the route simulation and opens described wavelength business what calculate.
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