CN102638404A - Optical network protection resource allocation method based on service differentiation - Google Patents
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Abstract
The invention discloses an optical network protection resource allocation method based on service differentiation. According to the optical network protection resource allocation method based on service differentiation, all kinds of services in an optical network are divided into high-level services, middle-level services and low-level services according to priority levels; and when a service request arrives, an operating path is dynamically selected through judging the real-time load of a link, and the sharing of the protection paths of all levels of services is realized. The optical network protection resource allocation method based on service differentiation disclosed by the invention has the advantages that the high-level services have low blocking rate and short service transfer time in an optical network environment with high complexity, and the overall resource utilization rate of the network can also be increased.
Description
Technical Field
The invention relates to an optical network, in particular to an optical network protection resource allocation method which grades service and adopts a corresponding protection strategy according to the grade.
Background
Protection is an important method for improving network survivability, and means that when one working channel fails, the working signal is maintained to be normally transmitted through a preset protection channel by using the switching of standby equipment. When a fault occurs, the protection can complete the switching work within 50ms under the control of the local network element or the remote network element, so that the service can be recovered to be normal in time, and the intervention of an external network management system is not needed. Therefore, protection schemes are often adopted for some important services. But once resources are allocated for protection purposes, they cannot be used for rerouting, so its resource utilization is often low.
Aiming at the defect of low resource utilization rate of the traditional protection method, the proposed improvement method comprises the following steps:
the method comprises the following steps: shared channel protection. [ Help.A shared path protection algorithm with traffic grooming capability in WDM mesh networks, proceedings of northeast university, 2003.4 ]. For a working path with two separate links, a protection path may be established with both working paths being link-separated. Because the protection path is only used when the working path fails, as long as two working path links are separated, when a single link fails, the two working paths cannot fail at the same time, and the protection paths corresponding to the two working paths cannot be started at the same time, the protection paths corresponding to the two working paths can share resources, thereby improving the resource utilization rate of the whole network.
The second method comprises the following steps:Pand (4) protecting the ring. Reconfigurable in WDM networkPStudy of Ring model optical communication study, 2008.7]。PThe ring protection method realizes the rapid protection in the grid network through the ring channel preset by idle resources, and simultaneously allows the working channel to select the shortest direct route on the network resource graph.PThe setting of the circle occurs before any network failure and the required real-time switching action is pre-designed.PThe ring not only provides protection against link failures on the ring, but also provides protection against cross-over segment failures. For a protectionPAnd each link is configured with single-time protection resources, double working capacity protection can be realized for a cross-over link, single-time working capacity protection can be realized for a link on the circle, and the resource utilization rate is obviously improved.
In summary, some existing optical network protective methods are directed to improving resource utilization, but ignore differences between services. With the increase of the current service types, the division of the priority of each service also becomes a necessary trend, so that the current protective method cannot effectively distinguish the services.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the defects of the existing optical network protection method, and provide an optical network protection resource allocation method based on service differentiation, which adopts a corresponding protection mode according to the difference between services.
The invention solves the technical problems by adopting the following technical scheme.
A method for distributing optical network protection resources based on service differentiation is disclosed, wherein each service is divided into three grades: high-level, medium-level, low-level services; for the newly arrived current service, firstly, a shortest path is found out by adopting a shortest routing algorithm, and the current load of a link where the shortest path is located is considered:
when the current load of the link where the shortest path is located is smaller than a preset first threshold, directly taking the shortest path as a working path of the current service, and searching a shortest path from the remaining paths by using a shortest routing algorithm to serve as a protection path of the current service;
when the current load of the link where the shortest path is located is greater than or equal to a preset first threshold and less than a preset second threshold, if the current service is a medium-level or high-level service, taking the shortest path as a working path of the current service, and searching a shortest path from the remaining paths by using a shortest routing algorithm as a protection path of the current service; if the current service is a low-level service, searching a shortest path from the rest paths by using a shortest routing algorithm as a protection path of the current service, and searching a shortest path from paths except the shortest path and the protection path of the current service by using the shortest routing algorithm as a working path of the current service;
when the current load of the link where the shortest path is located is greater than or equal to a second threshold, if the current service is a high-level service, taking the shortest path as a working path of the current service, and searching a shortest path from the remaining paths by using a shortest routing algorithm as a protection path of the current service; if the current service is a medium-level service, searching a shortest path from the rest paths by using a shortest routing algorithm as a protection path of the current service, and searching a shortest path of which the current load of a link is smaller than a second threshold value from paths except the shortest path and the protection path of the current service by using the shortest routing algorithm as a working path of the current service; if the current service is a low-level service, searching a shortest path from the rest paths by using a shortest routing algorithm as a protection path of the current service, and searching a shortest path of which the current load of a link is smaller than a first threshold value from paths except the shortest path and the protection path of the current service by using the shortest routing algorithm as a working path of the current service;
the link load refers to the proportion of the number of the wavelengths distributed on the link to the total number of the wavelengths of the link; the first and second thresholds satisfy: the first threshold value < the second threshold value < 1.
Preferably, the shortest routing algorithm is Dijkstra shortest routing algorithm. Of course, other shortest routing algorithms, such as the SPFA algorithm (shortest path fast algorithm) and Bellman-Ford algorithm, etc., may be used.
Compared with the prior art, the invention can ensure that the high-grade service (namely the most important service) has lower blocking rate and shorter fault recovery time, and the overall resource utilization rate of the network is also improved.
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Fig. 1 is a flowchart of a method for allocating optical network protection resources based on service differentiation according to the present invention;
fig. 2 is a flowchart of a specific embodiment, where 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 are node numbers in an optical network, a solid line with an arrow indicates a working path, and a dotted line with an arrow indicates a protection path.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings:
the idea of the invention is as follows: when a service request comes, a working path is dynamically selected by judging the real-time load of a link, and protection path sharing among services at all levels is realized. The method ensures that the high-grade service has lower blocking rate and shorter service transmission time in the optical network environment with higher complexity, and improves the utilization rate of the overall network resources.
In the invention, various services in the optical network are divided into three priority levels: high-level services, medium-level services, low-level services. The specific service classification method may be determined according to actual conditions, for example, according to the following methods:
the method comprises the following steps: the relatively important traffic has a higher priority, while the general traffic has a lower priority, divided according to the importance of the traffic. The business of important organizations such as civil aviation, bank, etc. is determined as high-grade business; the business of some companies and organizations is classified as middle-level business; whereas the services of a typical individual user are destined to low-level services.
The second method comprises the following steps: and dividing the sensitivity of the service to the time delay according to the sensitivity of the service to the time delay, wherein the sensitivity of different services to the time delay is different. Some services with higher requirements for delay have higher priority, and services with lower requirements for delay have lower priority. For example, some conversational services have a high requirement on delay and are defined as advanced services; some mails, fax type services generally require time delay and are defined as medium level services; and some background services can accept larger time delay and are determined as low-level services.
The third method comprises the following steps: according to the business service quality division, according to the difference of user payment cost, dividing a high-level user, a medium-level user and a low-level user, and respectively providing different service qualities.
In the present invention, the current load of the link (in terms of load)bExpressed) refers to the ratio of the number of wavelengths used on the link to the total number of wavelengths of the link; the invention presets two link load thresholdspAndqis used to mark the current busy level of the link, andp<q<1。
as shown in fig. 1, the method for allocating optical network protection resources based on service differentiation specifically includes the following steps:
step 1, initializing a network, judging whether a service connection request exists at the current moment, and if the service connection request exists, turning to step 2;
step 3-1 uses the idle resources in the shortest link to allocate a working path for the service connection request, then deletes the shortest link in the network topology, and finds out a shortest path as a protection path of the service by using Dijkstra shortest route algorithm;
step 3-2, judging the grade of the current service, and if the grade is a medium-grade service or a high-grade service, turning to step 3-1; if the service is low-level service, turning to step 3-4;
step 3-3, judging the grade of the current service, and if the grade is a high-grade service, turning to step 3-1; if the service is the medium-grade service, turning to the step 3-5; if the service is a low-level service, turning to step 3-6;
step 3-4 deleting the shortest link and the link passed by the service protection path on the link in the network topology, and finding out a link with the shortest link by using Dijkstra routing algorithmLoad less thanpThe shortest path of the protection link is used as a working path of the current service, and the protection path on the protection link deleted just now is used as a protection path;
step 3-5 deleting the shortest link and the link passed by the service protection path on the link in the network topology, and finding out a link with the load smaller than that of the link by using Dijkstra shortest route algorithmqThe shortest path of the intermediate-level service is used as a working path of the intermediate-level service, and a protection path on the protection link which is just deleted is used as a protection path;
step 3-6 deleting the shortest link and the link passed by the service protection path on the link in the network topology, and finding out a link with the load smaller than that of the link by using Dijkstra shortest route algorithmpThe shortest path of (a) is taken as the working path for the low-level traffic and the protection path on the protection link just deleted is taken as the protection path.
To facilitate understanding of the technical solutions of the present invention by the public, a simpler example is further described below. In the pan-european COST239 network topology shown in fig. 1, there are ten network nodes 0-9. For the selection of the working path and the protection path of each level of service with the source node being 0 and the destination node being 9, the following details are provided:
(1) firstly, the shortest link is calculated to be 0-9 by using the shortest routing algorithm, if the load on the link is less thanpTaking the idle path on the link as a working path, removing the link from 0 to 9, using the shortest routing algorithm to obtain a shortest link from 0 to 8 to 9, and using the idle path of the link as a protection path.
(2) If the link load between 0 and 9 isbSatisfy the following requirementsp≤b<qFor medium and high grade service, the idle path on the 0-9 link is continuously used as the working path, and 0-8-9 is used as the protection link; for low-level traffic, two links, 0-9 and 0-8-9, are removed, and a shortest link, 0-7-6-9, is solved. Judging the link load of 0-7-6-9, if less thanpThen 0-7-6-9 is used as the working path and 0-8-9 is used as the protectionA path. Otherwise, solving the secondary short link 0-5-10-9, and continuously judging the load of the link until finding a link with the load smaller than that of the linkpThe working path is allocated with 0-8-9 as the protection path.
(3) If the load is between 0 and 9, the load is satisfiedq≤b<1，For the high-level service, the link 0-9 is continuously used as a working path, and the link 0-8-9 is used as a protection link; for the medium-level service, two links of 0-9 and 0-8-9 are removed, and a shortest link of 0-7-6-9 is solved. Judging the link load of 0-7-6-9, if less thanqThen 0-7-6-9 is used as the working path and 0-8-9 as the protection path. Otherwise, solving the secondary short link 0-5-10-9, and continuously judging the load of the link until finding a link with the load smaller than that of the linkqThe working path is allocated by the link of (1), and 0-8-9 is taken as a protection path; for low-level service, two links of 0-9 and 0-8-9 are removed to solve the shortest path 0-7-6-9, and the load of the path is judged, if the load is less than the load of the pathpThen this shortest path is used as the working path and 0-8-9 as the protection path. Otherwise, solving the secondary short link 0-5-10-9, and continuously judging the load of the link until finding a link with the load smaller than that of the linkpThe working path is allocated with 0-8-9 as the protection path.
(4) When the working paths of the high, medium and low services have faults, the paths of the services with different levels can be switched to the protection paths 0-8-9.
Therefore, the sharing among the high-level service protection link, the medium-level service protection link and the low-level service protection link is realized, and the higher-level service has more shorter link options, so that the blocking rate and the service transmission time are reduced.
Claims (3)
1. A method for distributing optical network protection resources based on service differentiation is characterized in that various services are divided into three levels: high-level, medium-level, low-level services; for the newly arrived current service, firstly, a shortest path is found out by adopting a shortest routing algorithm, and the current load of a link where the shortest path is located is considered:
when the current load of the link where the shortest path is located is smaller than a preset first threshold, directly taking the shortest path as a working path of the current service, and searching a shortest path from the remaining paths by using a shortest routing algorithm to serve as a protection path of the current service;
when the current load of the link where the shortest path is located is greater than or equal to a preset first threshold and less than a preset second threshold, if the current service is a medium-level or high-level service, taking the shortest path as a working path of the current service, and searching a shortest path from the remaining paths by using a shortest routing algorithm as a protection path of the current service; if the current service is a low-level service, searching a shortest path from the rest paths by using a shortest routing algorithm as a protection path of the current service, and searching a shortest path from paths except the shortest path and the protection path of the current service by using the shortest routing algorithm as a working path of the current service;
when the current load of the link where the shortest path is located is greater than or equal to a second threshold, if the current service is a high-level service, taking the shortest path as a working path of the current service, and searching a shortest path from the remaining paths by using a shortest routing algorithm as a protection path of the current service; if the current service is a medium-level service, searching a shortest path from the rest paths by using a shortest routing algorithm as a protection path of the current service, and searching a shortest path of which the current load of a link is smaller than a second threshold value from paths except the shortest path and the protection path of the current service by using the shortest routing algorithm as a working path of the current service; if the current service is a low-level service, searching a shortest path from the rest paths by using a shortest routing algorithm as a protection path of the current service, and searching a shortest path of which the current load of a link is smaller than a first threshold value from paths except the shortest path and the protection path of the current service by using the shortest routing algorithm as a working path of the current service;
the link load refers to the proportion of the number of the wavelengths distributed on the link to the total number of the wavelengths of the link; the first and second thresholds satisfy: the first threshold value < the second threshold value < 1.
2. The method of claim 1, wherein the shortest routing algorithm is Dijkstra's shortest routing algorithm.
3. The method for allocating optical network protection resources based on service differentiation according to claim 1, wherein the service classification specifically follows the following method:
dividing according to the importance degree of the service, wherein the relatively important service has higher priority, and the general service has lower priority; or,
dividing according to the sensitivity of the service to the time delay, wherein the service with higher time delay requirement has higher priority, and the service with lower time delay requirement has lower priority; or,
according to the service quality division, different service qualities are respectively provided according to different payment fees of users.
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