JP6965876B2 - Optical network controller and optical path setting method - Google Patents

Description

The present invention relates to an optical network control device and an optical path setting method, and more particularly to an optical network control device and an optical path setting method having a recovery function from a failure.

The optical network provides a function of communicating the required traffic of a client device via an optical fiber communication path connecting bases. In an optical network, after multiplexing a plurality of client signals using various multiplexing methods, communication is performed via a larger capacity optical fiber communication path. As the multiplexing method, a wavelength division multiplexing (WDM) method, a time division multiplexing (TDM) method, or the like is used.

In recent years, in optical networks, for example, high-capacity traffic communication of 100 Gbps (Giga bit per second) class per wavelength has been performed. Therefore, the importance of technology for high-speed recovery from a failure (communication disconnection) caused by a disconnection of a communication path or a failure of an optical node device is increasing. An example of a failure recovery technique in such an optical network is described in Patent Document 1.

The related communication system described in Patent Document 1 has a transmission node, a management device, and a management database. The transmission node is composed of an electric signal switching device, a plurality of transmitters / receivers a to f, an optical cross-connect device, and a control device.

Here, the management device determines the transmitter / receiver a as the active system for the input signal A, and the transmitter / receiver b as the exclusive primary standby system for the input signal A. Further, the management device determines the transmitter / receiver c as the active system for the input signal B and the transmitter / receiver d as the active system for the input signal C. Further, the management device determines the transmitter / receiver e as a shared primary backup system for the input signal B and the input signal C, and determines the transmitter / receiver f as a shared secondary standby system shared between redundant configurations.

With such a redundant configuration, the transmitter / receiver a of the active system and the transmitter / receiver b of the occupied primary standby system are provided for the input signal A, and the redundant system of (1 + 1) is configured. Further, for the input signal B and the input signal C, the transmitter / receiver c and d of the active system and one transmitter / receiver e of the primary standby system shared type are provided, respectively, and a (2: 1) redundant system is constructed. NS. Further, the transmitter / receiver f is shared as a shared secondary standby system between the (1 + 1) redundant configuration of the input signal A and the (2: 1) redundant configuration of the input signal B and the input signal C.

In this case, in the input signal A, when one failure occurs in either the active system or the primary standby system, if there is a failure in the active system, after switching to the primary standby system and restoring, the secondary standby system is used. Is used with a probability of 1/2 to reconstruct the redundant system of the active system and the primary standby system. If this reconstruction is successful, switching recovery is possible even if a second failure occurs in the reconstructed active system and the redundant system of the primary standby system.

In this way, according to the optical path protection method in which multiple spare paths are set in advance on different physical paths and switched to the remaining spare paths in the event of a failure, it is possible to recover from multiple failures at high speed. Is.

JP-A-2015-165609 Japanese Unexamined Patent Publication No. 2005-0576669

In order to preset a plurality of spare paths in case of simultaneous failure at a plurality of locations by the above-mentioned optical path protection method, it is necessary to search for an alternative route that does not overlap with the operation path. However, for example, when searching for two routes as alternative routes, the physical route length of the second route tends to be very large. Therefore, the frequency utilization efficiency is lowered. Further, in this case, it is necessary to add a reproduction repeater, which causes an increase in delay. Also, depending on the network topology, there may be only one alternative route for the request traffic. Further, for a request traffic for which there is no available spare path, it is necessary to search for a route that bypasses the failure location by a restoration function (see, for example, Patent Document 2) after the failure occurs. In this case, the recovery time becomes long.

As described above, in the optical network, there is a problem that it is difficult to realize high-speed recovery from a failure at a plurality of locations without causing a decrease in frequency utilization efficiency.

An object of the present invention is to solve the above-mentioned problem that it is difficult to realize high-speed recovery from a failure at a plurality of locations in an optical network without causing a decrease in frequency utilization efficiency. It is an object of the present invention to provide an optical network control device and an optical path setting method.

The optical network control device of the present invention includes an optical path setting means for setting a plurality of first optical paths in a route candidate including a specific communication path in which duplication of a plurality of optical paths is allowed, and a plurality of first opticals. An optical path selection means for preliminarily selecting a second optical path is provided as a path that minimizes the number of shared communication paths shared by the paths.

In the optical path setting method of the present invention, a plurality of first optical paths are set in a route candidate including a specific communication path in which duplication of a plurality of optical paths is allowed, and shared by the plurality of first optical paths. A second optical path is selected in advance as the path that minimizes the number of communication paths.

According to the optical network control device and the optical path setting method of the present invention, high-speed recovery from a failure at a plurality of locations of the optical network can be realized without causing a decrease in frequency utilization efficiency.

It is a block diagram which shows the structure of the optical network control apparatus which concerns on 1st Embodiment of this invention. It is a block diagram which shows the structure of the optical communication system which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the connection structure of the optical network control device and the optical node device which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the structure of the optical node apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart for demonstrating operation of the optical network control apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart for demonstrating the failure recovery operation of the optical network control apparatus which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the structure of the optical communication system which concerns on 3rd Embodiment of this invention. It is a block diagram which shows the structure of the optical node apparatus which concerns on 3rd Embodiment of this invention. It is a flowchart for demonstrating operation of the optical network control apparatus which concerns on 3rd Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 3rd Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 3rd Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 3rd Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 3rd Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 3rd Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 3rd Embodiment of this invention. It is a flowchart for demonstrating operation of the optical network control apparatus which concerns on 4th Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 4th Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 4th Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 4th Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 4th Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 4th Embodiment of this invention. It is a block diagram which shows the structure of the optical network control apparatus which concerns on 5th Embodiment of this invention. It is a flowchart for demonstrating operation of the optical network control apparatus which concerns on 5th Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 5th Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 5th Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 5th Embodiment of this invention. It is a figure for demonstrating the preliminary path allocation operation of the optical network control apparatus which concerns on 5th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a block diagram showing a configuration of an optical network control device 10 according to a first embodiment of the present invention. The optical network control device 10 includes an optical path setting means 11 and an optical path selection means 12.

The optical path setting means (optical path setting unit) 11 sets a plurality of first optical paths in a route candidate including a specific communication path in which duplication of a plurality of optical paths is allowed. The optical path selection means (optical path selection unit) 12 selects in advance a second optical path as a path that minimizes the number of shared communication paths shared by the plurality of first optical paths.

As described above, in the optical network control device 10, the optical path setting means 11 sets a plurality of first optical paths in the route candidates including the specific communication paths where duplication is allowed. Therefore, even when optical paths are set for a plurality of routes, it is possible to select a short-distance route. Therefore, it is possible to avoid a decrease in frequency utilization efficiency due to a longer physical path length. Here, the optical path selection means 12 has a configuration in which a second optical path is selected in advance as a path that minimizes the number of shared communication paths. Therefore, when a failure occurs in the shared communication path, it is not necessary to search for a route that bypasses the failure location by the restorative function. Therefore, high-speed recovery is possible.

Next, the optical path setting method according to the present embodiment will be described.

In the optical path setting method according to the present embodiment, first, a plurality of first optical paths are set in a route candidate including a specific communication path in which duplication of a plurality of optical paths is allowed. Then, the second optical path is selected in advance as the path that minimizes the number of shared communication paths shared by the plurality of first optical paths.

Alternatively, the computer may be made to perform each of the above steps. That is, a program for making the computer function as an optical path setting means and an optical path selection means can be used. Here, the optical path setting means sets a plurality of first optical paths in a route candidate including a specific communication path where duplication of a plurality of optical paths is allowed. Then, the optical path selection means selects the second optical path in advance as the path that minimizes the number of shared communication paths shared by the plurality of first optical paths.

As described above, according to the optical network control device 10 and the optical path setting method of the present embodiment, high-speed recovery from a failure at a plurality of locations of the optical network can be realized without causing a decrease in frequency utilization efficiency. Can be done.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. FIG. 2 shows the configuration of the optical communication system 1000 according to the present embodiment. As shown in the figure, the optical communication system 1000 includes an optical network control device 100 and an optical network 200.

FIG. 2 shows an example in which nine optical node devices 301 to 309 are connected by an optical fiber communication path 401 to form an optical network 200. In the figure, an operation path and a plurality of spare paths (first to third spare paths) are set between the optical node devices, and between the optical node device 301 and the optical node device 304, and between the optical node device 306 and the optical node device. An exemplary case where a failure occurs between 309 is shown.

The optical network control device 100 according to the present embodiment includes a route candidate limiting means 110, a shared metric calculation means 120, an optical path allocating means 130, a communication path extracting means 140, a recovery path selecting means (second path selecting means) 150, and The setting notification interface 160 is provided.

The route candidate limiting means (route candidate limiting unit) 110 determines an allocation route candidate to be included in the communication path to which the optical path is assigned among the communication paths constituting the optical network 200. The shared metric calculation means (shared metric calculation unit) 120 calculates the degree of sharing of a plurality of optical paths to be assigned to the route candidates including the allocation route candidates. Then, the optical path allocating means (optical path allocating unit) 130 determines the path and wavelength slot of the plurality of first optical paths accommodating the required traffic based on the degree of sharing. The above-mentioned route candidate limiting means 110, shared metric calculation means 120, and optical path assigning means 130 constitute an optical path setting means, and a plurality of route candidates including a specific communication path where duplication of a plurality of optical paths is allowed Set the first optical path.

The communication path extraction means (communication channel extraction unit) 140 extracts a shared communication path shared by a plurality of first optical paths. The recovery path selection means (recovery path selection unit) 150 selects the second optical path as the path that minimizes the number of shared communication paths included. The communication path extraction means 140 and the recovery path selection means (second path selection means) 150 described above constitute the optical path selection means, and the path is such that the number of shared communication paths shared by the plurality of first optical paths is minimized. , The second optical path is selected in advance.

The setting notification interface (setting notification means) 160 is selected by the recovery path selection means 150 and the first optical path information which is information on the paths and wavelength slots of the plurality of first optical paths determined by the optical path allocation means 130. The second optical path information, which is information about the second optical path, is notified to the optical node devices 301 to 309.

FIG. 3 shows the connection configuration of the above-mentioned optical network control device 100 and the optical node device, and the configuration of the optical node device. Each of the optical node devices 301 to 309 includes an optical node device setting notification interface 310, an optical node device control means 320, and an optical path switching means 330, respectively.

The optical node device setting notification interface (optical node device setting notification means) 310 receives the above-mentioned first optical path information and second optical path information from the setting notification interface (setting notification means) 160 included in the optical network control device 100. .. The optical path switching means 330 transmits signal light modulated based on the client signal constituting the request traffic to the optical fiber communication path (optical communication path) 401. The optical node device control means 320 controls the optical path switching means 330 based on the first optical path information and the second optical path information.

Here, the setting notification interface 160 and the optical node device setting notification interfaces 310-1 and 310-2 are connected. Further, the optical path switching means 330-1 included in the optical node device 301 and the optical path switching means 330-2 included in the optical node device 302 are connected by an optical fiber communication path 401.
FIG. 4 shows the configuration of the optical node device in more detail. The optical path switching means 330 included in the optical node device 300 includes a client device 331-13-331-4, a variable optical transponder 332-1, 332-2, and a variable large particle size switching device 333. As the variable large particle size switching device 333, for example, an optical cross-connect device, a band variable wavelength selection switch, or the like can be used.

The optical node device control means 320 includes a wavelength control means 321 and a direction control means 322. The wavelength control means 321 controls the wavelength setting of the variable optical transponders 332-1 and 332-2 and the variable large particle size switching device 333. The direction control means 322 controls the direction of the variable large particle size switching device 333.

Next, the operation of the optical network control device 100 according to the present embodiment will be described. FIG. 5 is a flowchart for explaining the operation of the optical network control device 100 according to the present embodiment.

First, the optical network control device 100 extracts one required traffic (step S110), and allocates an optical path accommodating the required traffic to the optical network 200 (step S120).

Specifically, first, it is determined whether it is necessary to set a preliminary path for the extracted request traffic (step S121).

When it is determined that it is necessary to set a preliminary path (step S121 / YES), the optical path allocating means 130 searches for the shortest path connecting the start point node and the end point node without overlapping each other (step S122). At this time, as the route search algorithm, a linear programming method, a k-th shortest path search method, a genetic algorithm, or the like can be used. When it is determined that it is not necessary to set a spare path (step S121 / NO), one shortest path connecting the start point node and the end point node is searched for (step S123).

With respect to the result of searching for the shortest path, it is determined whether or not the number of paths that do not overlap each other is sufficient for the number of required optical paths (search is successful) (step S124).

When the number of routes that do not overlap with each other is insufficient for the number of required optical paths (step S124 / NO), the route candidate limiting means 110 allows duplication in a specific communication path and updates the route search candidate. Then, the shortest path is searched again, and the path that minimizes the overlap with other optical paths is determined based on the shared metric (sharing degree) calculated by the shared metric calculation means 120 (step S125).

The optical path allocating means 130 calculates a required number of wavelength slots based on the communication path quality of the optical path allocating path and the reachability of the optical path in the re-searched path (step S126), and determines the wavelength slots to be allocated. (Step S127). As the communication path quality, the communication path distance, the number of hops, the optical signal noise ratio (Optical Signal-to-Noise Ratio: OSNR), and the like can be used.

The route candidate limiting means 110 sets the communication path connected to the optical node device whose number of paths is smaller than the number of the plurality of assigned optical paths (first optical path) as a communication path (specific communication path) where duplication is allowed. can do. Here, assuming that there are three types of assigned optical paths, an operation path, a first spare path, and a second spare path, a communication path connected to an optical node device having 2 or less paths (4 or less directions). Can be a specific communication path. Not limited to this, the number of optical path allocations or used wavelength slots, the amount of allocated optical paths accommodated, the number of wavelength fragmentation slots, etc. are below the threshold set in advance by the network operator of the telecommunications carrier. May be a specific communication path.

The shared metric calculation means 120 is shared based on at least one of the number of communication paths shared by a plurality of optical paths accommodating the request traffic, the number of shared optical paths, and the number of each type of shared optical path. It can be configured to calculate the metric (sharing degree). The assigned wavelength slot may be shared among a plurality of optical paths accommodated in the shared communication path.
Next, the optical path for restoration is selected (step S130).

The communication path extraction means 140 extracts a communication path (shared communication path) shared by a plurality of optical paths (first optical paths) accommodating the request traffic (step S131). Then, the recovery path selection means 150 selects an optical path (second optical path) for recovery when a failure occurs in the shared communication path extracted by the communication path extraction means 140 (step S132). At this time, the recovery path is selected assuming a failure occurrence pattern in which failures for the maximum number of spare paths occur at the same time, and the selection result is retained.

By performing the above-mentioned operation (steps S110 to S132) for all the required traffic (step S140 / YES), the setting of the optical path allocation is completed.

The setting notification interface 160 notifies the optical node device setting notification interface 310 provided in each of the optical node devices 301 to 309 for the setting of the optical path allocation. The optical node device control means 320 controls the direction and wavelength of the optical path switching means 330 based on the above notification. That is, the optical path switching means 330 uses the variable optical transponders 332-1 and 332-2 to generate an optical path based on the number of wavelength slots determined according to the path quality of the optical path, and the optical fiber communication path 401. Assign an optical path to. As a result, the optical node device 300 establishes communication.

Next, the failure recovery operation of the optical network control device 100 according to the present embodiment will be described. FIG. 6 is a flowchart for explaining the failure recovery operation of the optical network control device 100 according to the present embodiment.

When the optical node devices 301 to 309 detect the occurrence of a failure, the failure location is notified to the optical network control device 100 via the setting notification interface 160. The recovery path selection means 150 extracts one recovery target operation path interrupted due to a failure (step S210), and refers to the recovery path selected in advance according to the failure location (step S221). If a recovery path selected in advance exists (step S222 / YES), the recovery path is switched to the operating state (step S223). In order to switch this recovery path to the operating state, the setting notification interface 160 notifies the optical node devices 301 to 309 of the optical path switching setting.

When the recovery path selection means 150 determines that recovery cannot be performed with the recovery path selected in advance (step S222 / NO), the route candidate limiting means 110 excludes the failed communication path from the route search candidates. In this state, the optical path allocating means 130 searches for an alternative route that bypasses the fault location (step S231). If the search is successful (step S232 / YES), the required number of wavelength slots for the optical path of the search result path is calculated based on the communication path quality and the reachability of the optical path in the optical path allocation path (step S234). ), The assigned wavelength slot is determined (step S235).

On the other hand, when an additional spare path is required after the failure occurs for the request traffic (step S224 / YES), the route candidate limiting means 110 excludes the communication path of the failure communication path and the recovery path route from the route search candidates. In that state, the optical path allocating means 130 searches for an alternative route for the additional preliminary path (step S231). If no alternative route is found as a result of the route search (step S232 / NO), the route candidate limiting means 110 allows duplication in a specific communication path and updates the route search candidate. Then, the shortest path is searched again, and the path that minimizes the overlap with other optical paths is determined based on the shared metric (sharing degree) calculated by the shared metric calculation means 120 (step S233).

The optical path allocating means 130 calculates a required number of wavelength slots based on the communication path quality of the optical path allocating path and the reachability of the optical path in the re-searched path (step S234), and determines the wavelength slots to be allocated. (Step S235).

After that, the recovery path selection means 150 selects an optical path for recovery when a failure occurs in the shared communication path extracted by the communication path extraction means 140 (step S240).

By performing the above-mentioned operation (steps S210 to S240) for all the optical paths interrupted by the failure (step S250 / YES), the communication recovery process is completed.

7A to 7F show an example of assigning a spare path between the optical node devices 301 to 309 for the request traffic.

As shown in FIG. 7A, when the required number of preliminary paths for the request traffic is two, the optical path allocating means 130 first allocates the operation path and the first preliminary path on paths that do not overlap with each other. However, no route for the second preliminary path can be found on a route that does not overlap with each other.

Next, the route candidate limiting means 110 includes the communication path 410 connected to the optical node devices 301, 303, 307, and 309 having 4 or less directions shown in FIG. 7B as the route search candidate. After that, a route search is performed. At this time, the shared metric calculation means 120 calculates the "number of shared communication paths" and the "number of shared optical paths for each type" for the route candidates (A), (B), and (C) shown in FIG. 7C ( (See FIG. 7D), the second preliminary path is assigned to the path (C) having the smallest value (FIG. 7E).

The communication path extraction means 140 extracts a shared communication path shared with another optical path. Then, the recovery path selection means 150 selects a recovery path when a failure occurs in this common communication path. The selection result of the recovery path is shown in FIG. 7F.

By the operation of the optical network control device 100 of the present embodiment described above, it is possible to increase the number of substantially set spare paths in preparation for a situation in which a failure occurs at a plurality of locations on the communication path at the same time. Further, the failure recovery performance can be improved by selecting in advance a recovery path when a failure occurs in a communication path shared between a plurality of optical paths.

Next, the optical path setting method according to the present embodiment will be described.

In the optical path setting method according to the present embodiment, first, among the communication paths constituting the optical network, allocation route candidates to be included in the communication path to which the optical path is allocated are determined. The degree of sharing of a plurality of optical paths to be assigned to the route candidates including this allocation route candidate is calculated. Then, based on this degree of sharing, the paths and wavelength slots of the plurality of first optical paths accommodating the required traffic are determined. As described above, a plurality of first optical paths are set in the route candidate including the specific communication path where the overlap of the plurality of optical paths is allowed.

Further, a shared communication path shared by a plurality of first optical paths is extracted. Then, the second optical path is selected as the path that minimizes the number of shared communication paths included. As a result, the second optical path is selected in advance as the path that minimizes the number of shared communication paths shared by the plurality of first optical paths.

Alternatively, the computer may be made to perform each of the above steps. That is, a program for making the computer function as a route candidate limiting means, a shared metric calculation means, an optical path assigning means, a communication path extracting means, and a second path selection means can be used.

Here, the route candidate limiting means determines an allocation route candidate to be included in the communication path to which the optical path is allocated among the communication paths constituting the optical network. The shared metric calculation means calculates the degree of sharing of a plurality of optical paths to be assigned to the route candidates including the allocation route candidates. Then, the optical path assigning means determines the path and wavelength slot of a plurality of first optical paths accommodating the required traffic based on this degree of sharing.

Further, the communication path extraction means extracts a shared communication path shared by a plurality of first optical paths. The second path selection means selects the second optical path as the path that minimizes the number of shared communication paths included.

As described above, according to the optical network control device 100 and the optical path setting method of the present embodiment, even when the number of alternative routes independent of the operation path is limited, a substantial preliminary path can be used. The number of settings can be increased. This makes it possible to prepare for a situation in which a failure occurs at a plurality of locations at the same time. Furthermore, it is possible to improve the recovery performance by determining in advance the recovery path when a failure occurs in a physical path that overlaps between a plurality of optical paths. Therefore, it is possible to maintain the reliability of the network by updating the recovery path allocation in the event of a failure.

As described above, according to the optical network control device 100 and the optical path setting method of the present embodiment, it is possible to realize high-speed recovery from a failure at a plurality of locations of the optical network without causing a decrease in frequency utilization efficiency. ..

Further, since the overlapping points of the physical routes are limited to each request traffic, the calculation scale for determining the recovery path in advance is small. Further, the calculation scale and the work scale can be reduced by excluding the preliminary optical path whose frequency utilization efficiency is lowered when the optical path allocation is updated.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. FIG. 8 shows the configuration of the optical communication system 1001 according to the present embodiment. As shown in the figure, the optical communication system 1001 includes an optical network control device 101 and an optical network 201.

FIG. 8 shows an example in which nine optical node devices 301 to 309 are connected by an optical fiber communication path 401 to form an optical network 201. In the figure, an operation path and a plurality of spare paths (first spare path, second spare path 1, second spare path 2) are set between the optical node devices, and between the optical node device 301 and the optical node device 304, An example shows a case where a failure occurs between the optical node device 306 and the optical node device 309.

The optical network control device 101 according to the present embodiment includes a route candidate limiting means 110, a shared metric calculation means 120, an optical path allocating means 130, a communication path extracting means 140, a recovery path selecting means 150, and a setting notification interface 160. The configuration up to this point is the same as the configuration of the optical network control device 100 according to the second embodiment.

The optical network control device 101 according to the present embodiment further includes a containment traffic dividing means (accommodation traffic division unit) 170. Here, the optical path allocation means 130 selects a plurality of allocation routes independent of each other to which the first optical path is allocated, and accommodates the request traffic in the plurality of first optical paths divided into the plurality of allocation paths. Then, the accommodation traffic dividing means 170 divides the transfer rate of the requested traffic into the number of a plurality of allocated routes.

FIG. 9 shows the configuration of the optical node device 301. The optical node device 301 includes an optical node device setting notification interface 310, an optical node device control means 320, and an optical path switching means 340. The optical path switching means 340 includes client devices 341-1 to 341-4, variable optical transponders 342-1 and 342-2, and a variable large particle size switching device 343. For example, a multi-flow optical transponder can be used as the variable optical transponders 342-1 and 342-2. The multi-flow optical transponder can assign a band-variable optical path to each of a plurality of directions.

Next, the operation of the optical network control device 101 according to the present embodiment will be described. FIG. 10 is a flowchart for explaining the operation of the optical network control device 101 according to the present embodiment.

First, the optical network control device 101 extracts one request traffic (step S310), and allocates an optical path accommodating the request traffic to the optical network 201 (step S320).

Specifically, first, it is determined whether it is necessary to set a preliminary path for the extracted request traffic (step S321).

When it is determined that it is not necessary to set a spare path (step S321 / NO), one shortest path connecting the start point node and the end point node is searched for (step S323).

When it is determined that it is necessary to set a preliminary path (step S321 / YES), the optical path allocating means 130 searches for the shortest path connecting the start point node and the end point node without overlapping each other (step S322).

With respect to the result of searching for the shortest path, it is determined whether or not the number of paths that do not overlap each other is sufficient for the number of required optical paths (search is successful) (step S324).

When the number of paths that do not overlap each other is insufficient for the number of required optical paths (step S324 / NO), the route candidate limiting means 110 allows overlap with other optical paths in a specific communication path, and routes. Update search candidates. Then, the shortest path is searched again using the shared metric calculated by the shared metric calculation means 120 (step S325).

As a result of performing the route search again, when there is a communication path shared with another optical path (step S328 / YES), the route candidate limiting means 110 excludes the shared communication path from the route search candidates, and then again. The search for the shortest route is performed (step S329). This makes it possible to eliminate the case where the communication path is shared in triplicate. At this time, the route candidate limiting means 110 may designate the entire route found by the re-route search as a communication route to be excluded from the route search candidates.

If the search for the shortest path is successful again (step S330 / YES), the accommodation traffic dividing means 170 divides the transfer rate of the accommodation traffic (certified information rate, Committed Information Rate: CIR) into the number of allocated routes of the search result. (Step S331). Then assign an optical path.

The optical path allocation means 130 calculates a required number of wavelength slots based on the communication path quality of the allocation route (step S326), and determines the wavelength slots to be allocated (step S327).

The accommodation traffic dividing means 170 can be configured to change the division ratio of the transfer rate according to the number of required wavelength slots of the optical path assigned to the division path. That is, the accommodation traffic dividing means 170 can determine the ratio of dividing the transfer rate based on the frequency utilization efficiency of the plurality of assigned optical paths (first optical paths). Not limited to this, the accommodation traffic dividing means 170 may be equally divided into the number of physical routes to which the transfer rate (CIR) of the requested traffic is allocated.

Next, the optical path for restoration is selected (step S340).

The communication channel extraction means 140 extracts a communication channel (shared communication channel) shared by a plurality of optical paths accommodating the request traffic (step S341). Then, the recovery path selection means 150 selects an optical path for recovery when a failure occurs in the shared communication path extracted by the communication path extraction means 140 (step S342). At this time, the recovery path is selected assuming a failure occurrence pattern in which failures for the maximum number of spare paths occur at the same time, and the selection result is retained.

By performing the above-mentioned operation (steps S310 to S342) for all the required traffic (step S350 / YES), the setting of the optical path allocation is completed.

The setting notification interface 160 notifies the optical node device setting notification interface 310 provided in each of the optical node devices 301 to 309 of the setting result of the optical path allocation. The optical node device control means 320 controls the direction and wavelength of the optical path switching means 340 based on the above notification. That is, the optical path switching means 340 generates an optical path by using the variable optical transponders 342-1 and 342-2 based on the number of wavelength slots determined according to the path quality of the optical path, and the optical fiber communication path 401. Assign an optical path to. As a result, the optical node device 301 establishes communication.

11A to 11F show an example of assigning a spare path between the optical node devices 301 to 309 for the request traffic.

When the required number of preliminary paths for the request traffic is two, the optical path allocating means 130 first allocates the operation path and the first preliminary path on routes that do not overlap with each other, as shown in FIG. 11A. Then, as shown in FIG. 11B, the optical path allocating means 130 allocates the route of the second preliminary path.

Next, as shown in FIG. 11C, the route candidate limiting means 110 excludes the shared communication channels 501 and 504 from the route search candidates, and then performs the route search. At this time, the shared metric calculation means 120 calculates the "number of shared communication paths" and the "number of shared optical paths for each type" for the divided route candidates (D) and (E) shown in FIG. 11C (see FIG. 11D). ), Select the minimum division path (E) and assign the second preliminary path.

Here, as a result of performing the route search, the number of allocated routes of the second preliminary path is two, so the accommodation traffic dividing means 170 divides the transfer rate (CIR value) of the requested traffic into two. Then, as shown in FIG. 11E, the optical path allocating means 130 assigns each optical path (second preliminary path 1 and second preliminary path 2) to each path.

In this way, by arranging the optical paths in a distributed manner on a plurality of (N, N> 1) physical paths, it is possible to improve the fault tolerance and disperse the risk. In this case, if the distributed arrangement is performed while the CIR value remains the same as the required traffic, the required CIR value becomes N times, and the optical frequency resource is excessively consumed. However, in the optical network control device 101 of the present embodiment, as described above, the CIR value is divided into N and then distributed and arranged on the N physical paths, so that the overall CIR value does not change. This makes it possible to avoid allocating an excessive reserve path.

Subsequently, the communication channel extraction means 140 extracts shared communication channels 501 to 504 shared with other optical paths. Then, the recovery path selection means 150 selects a recovery path when a failure occurs in this common communication path. The selection result of the recovery path is shown in FIG. 11F.

After that, the optical network control device 101 notifies the optical node device 301 of the allocation result of the optical path via the setting notification interface 160. The optical node device 301 sets the optical path switching means 340 based on the notified allocation result. The variable optical transponder 342-1 can set a second preliminary path by setting an optical path having a CIR value of half for each path.

If the CIR value of the recovery path falls below the CIR value of the original requested traffic due to the occurrence of a failure, the variable transponders 342-1 and 342-2 back pressure on their respective client devices 341-1 to 341-4. Send a signal and adjust the CIR value.

The operation of the optical network control device 101 of the present embodiment described above makes it possible to set a highly reliable spare path in preparation for a situation in which a failure occurs at a plurality of locations on the communication path at the same time. Further, the failure recovery performance can be improved by selecting in advance a recovery path when a failure occurs in a communication path shared between a plurality of optical paths.

As described above, according to the optical network control device 101 of the present embodiment, it is possible to realize high-speed recovery from a failure at a plurality of locations of the optical network without causing a decrease in frequency utilization efficiency.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described. The configuration of the optical network control device according to the present embodiment is the same as the configuration of the optical network control device 101 according to the third embodiment shown in FIG. 8, but the operation is different.

The operation of the optical network control device according to the present embodiment will be described below. FIG. 12 is a flowchart for explaining the operation of the optical network control device according to the present embodiment.

The optical network control device first extracts one required traffic (step S110), and assigns an optical path accommodating the required traffic to the optical network (step S120). The allocation of the optical path (step S120) is the same as the operation of the optical network control device 100 according to the second embodiment. That is, the optical path allocating means 130 searches for a route connecting the start point node and the end point node (steps S121 to S125). Then, the optical path allocating means 130 calculates a required number of wavelength slots based on the communication path quality of the optical path allocating path and the reachability of the optical path in the searched path (step S126), and assigns the wavelength slots to be assigned. Determine (step S127).

Next, the optical path for restoration is selected (step S430).

The communication path extraction means 140 extracts a communication path (shared communication path) shared by a plurality of optical paths (first optical paths) accommodating the request traffic (step S431). Then, the recovery path selection means 150 selects an optical path (second optical path) for recovery when a failure occurs in the shared communication path extracted by the communication path extraction means 140 (step S432). At this time, the recovery path is selected assuming a failure occurrence pattern in which failures for the maximum number of spare paths occur at the same time, and the selection result is retained.

When the result selected by the recovery path selection means 150 is an assumed failure pattern for allocating the recovery path to the alternative route (step S433 / YES), the optical path allocation means 130 sets a spare path for the alternative route that does not overlap with each other. assign. At this time, the accommodation traffic dividing means 170 divides the CIR of the required traffic into the number of failure patterns (step S421).

In this case, the optical path allocating means 130 calculates the required number of wavelength slots based on the communication path quality of the optical path allocating path and the reachability of the optical path in the path searched here (step S126), and allocates the wavelength slots. The wavelength slot is determined (step S127). It should be noted that the CIR of the required traffic may be divided including the nth preliminary path for the requested traffic in which the number of required preliminary paths is n.

By performing the above-mentioned operation (steps S110 to S433) for all the required traffic (step S440 / YES), the setting of the optical path allocation is completed.

13A to 13E show an example of assigning a spare path between the optical node devices 301 to 309 for the request traffic.

As shown in FIG. 13A, when the required number of preliminary paths for the request traffic is two, the optical path allocating means 130 allocates the first preliminary path and the second preliminary path.

The communication path extraction means 140 extracts shared communication paths 501 and 504 shared with other optical paths (FIG. 13B). Then, the recovery path selection means 150 selects a recovery path when a failure occurs in the common communication paths 501 and 504. The selection result of the recovery path is shown in FIG. 13C.

Here, in the case of an assumed failure pattern in which failures occur simultaneously in the common communication path 501 and the common communication path 504, a recovery path is assigned on the alternative path. Therefore, the accommodation traffic dividing means 170 divides the CIR of the required traffic into two according to the total number of routes of the alternative route and the second preliminary path. Then, as shown in FIG. 13D, the optical path allocating means 130 assigns each optical path (second preliminary path 1 and second preliminary path 2) to each path. The selection result of the recovery path in this case is shown in FIG. 13E.

As described above, in the optical network control device, when the plurality of optical paths for which the degree of sharing is calculated do not include the recovery optical path (second optical path), the optical path allocating means 130 is included in the sharing. An optical path (first optical path) is assigned to an alternative path that minimizes the number of communication paths. Therefore, it is possible to reduce the amount of calculation when the optical network control device searches for a route.

After that, the optical network control device notifies the optical node device 301 of the allocation result of the optical path via the setting notification interface 160. The optical node device 301 sets the optical path switching means 340 based on the notified allocation result. The variable optical transponder 342-1 can set a second preliminary path by setting an optical path having a CIR value of half for each path.

If the CIR value of the recovery path falls below the CIR value of the original required traffic due to the occurrence of a failure, the variable optical transponders 342-1 and 342-2 back up to their respective client devices 341-1 to 341-4. A pressure signal is sent to adjust the CIR value.

By the operation of the optical network control device of the present embodiment described above, it is possible to set a highly reliable spare path in preparation for a situation in which a failure occurs at a plurality of locations in the communication path at the same time. Further, in a physical path in which a plurality of optical paths overlap, the failure recovery performance can be improved by pre-allocating a spare path on the alternative path.

As described above, according to the optical network control device of the present embodiment, it is possible to realize high-speed recovery from a failure at a plurality of locations of the optical network without causing a decrease in frequency utilization efficiency.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described. FIG. 14 shows the configuration of the optical network control device 102 according to the present embodiment.

The optical network control device 102 according to the present embodiment includes a route candidate limiting means 110, a shared metric calculation means 120, an optical path allocating means 130, a communication path extracting means 140, a recovery path selecting means 150, and a setting notification interface 160. The configuration up to this point is the same as the configuration of the optical network control device 100 according to the second embodiment.

The optical network control device 102 according to the present embodiment further includes a wavelength candidate limiting means (wavelength candidate limiting unit) 180. The wavelength candidate limiting means 180 specifies an assigned wavelength slot region to which wavelength slots of a plurality of optical paths (first optical paths) belong in common. At this time, the optical path allocating means 130 determines that the wavelength slots of the plurality of optical paths (first optical paths) are included in the allocated wavelength slot region.

Next, the operation of the optical network control device 102 according to the present embodiment will be described. FIG. 15 is a flowchart for explaining the operation of the optical network control device 102 according to the present embodiment.

First, the optical network control device 102 extracts one request traffic (step S110), and allocates an optical path accommodating the request traffic to the optical network (step S520).

The operation until the required number of wavelength slots in the optical path allocation (step S520) is calculated (step S126) is the same as the operation of the optical network control device 100 according to the second embodiment. That is, the optical path allocating means 130 searches for a route connecting the start point node and the end point node (steps S121 to S125). Then, the optical path allocating means 130 calculates the required number of wavelength slots based on the communication path quality of the optical path allocating path and the reachability of the optical path in the searched path (step S126).

If shared protection is possible for the request traffic (step S521 / YES) and there is a channel section shared with other spare paths (step S522 / YES), the allocated wavelength slot area is limited to the same (step S521 / YES). Step S523). That is, the wavelength candidate limiting means 180 limits the allotted wavelength slot regions of the spare paths of the shared communication path section to be the same. Then, the optical path allocation means 130 performs wavelength allocation (step S524).

By the above operation, it becomes possible to share a communication path and a wavelength among a plurality of spare paths. In this way, when combined with wavelength sharing protection, the amount of wavelength resources required to accommodate the spare path can be reduced.

Next, the optical path for restoration is selected (step S130).

The communication path extraction means 140 extracts a communication path (shared communication path) shared by a plurality of optical paths accommodating the request traffic (step S131). Then, the recovery path selection means 150 selects an optical path for recovery when a failure occurs in the shared communication path extracted by the communication path extraction means 140 (step S132). At this time, the recovery path is selected assuming a failure occurrence pattern in which failures for the maximum number of spare paths occur at the same time, and the selection result is retained.

Here, the highest priority spare path is established among the plurality of shared spare paths, and the wavelength slot is reserved for the other shared spare paths. Then, a spare path is established when it is selected as the recovery path. When sharing spare paths for different request traffic, the communication path extraction means 140 may extract the shared communication path, and the recovery path selection means 150 may select the optical path for the recovery path.

By performing the above-mentioned operation (steps S110 to S132) for all the required traffic (step S140 / YES), the setting of the optical path allocation is completed.

16A to 16C show an example of assigning a spare path between the optical node devices 301 to 309 for the request traffic.

As shown in FIG. 16A, when the required number of preliminary paths for the request traffic is two, the optical path allocating means 130 first allocates the operation path and the first preliminary path on physical paths that do not overlap with each other. Further, as shown in FIG. 16B, the optical path allocating means 130 allocates the second spare path on the paths that overlap with the operation path and the first spare path in the shared communication paths 501 and 504.

The wavelength candidate limiting means 180 limits the range of wavelength slots that can be commonly assigned in the operation path and the second preliminary path to the assigned wavelength slot region (FIG. 16C). Then, the optical path assigning means 130 determines the wavelength assigned to the optical path.

The optical network control device 102 notifies the optical node devices 301 to 309 of the allocation result of the optical path via the setting notification interface 160. The optical node devices 301 to 309 establish communication for the operation path and the first spare path, and reserve the assigned wavelength slot for the second spare path.

The recovery path selection means 150 realizes failure recovery by establishing the second spare path in the reserved wavelength slot when a failure occurs in which the second spare path is set as the operation path. The selection result of the recovery path is shown in FIG. 16D.

By the operation of the optical network control device 102 of the present embodiment described above, a highly reliable preliminary path is set in preparation for a situation in which a failure occurs at a plurality of locations of the communication path at the same time while preventing a decrease in network utilization efficiency. Will be possible. Further, in a physical path in which a plurality of optical paths overlap, the failure recovery performance can be improved by pre-allocating a spare path on the alternative path.

As described above, according to the optical network control device 102 of the present embodiment, it is possible to realize high-speed recovery from a failure at a plurality of locations of the optical network without causing a decrease in frequency utilization efficiency.

Some or all of the above embodiments may also be described, but not limited to:

(Appendix 1) The optical path setting means for setting a plurality of first optical paths in a route candidate including a specific communication path in which duplication of a plurality of optical paths is allowed is shared by the plurality of first optical paths. An optical network control device including an optical path selection means for preliminarily selecting a second optical path as a path that minimizes the number of shared communication paths.

(Appendix 2) Among the communication paths constituting the optical network, the optical path setting means includes a route candidate limiting means for determining an allocation route candidate to be included in the communication path to which the optical path is allocated, and the route including the allocation route candidate. A shared metric calculation means that calculates the degree of sharing of a plurality of optical paths to be assigned to candidates, and the optical path that determines the path and wavelength slot of the plurality of first optical paths that accommodate the request traffic based on the degree of sharing. The optical path selection means has the allocation means, and the number of the communication path extraction means for extracting the shared communication path shared by the plurality of first optical paths and the number of the shared communication paths included is the minimum. The optical network control device according to Appendix 1, which has a second path selection means for selecting the second optical path as a path.

(Appendix 3) When the second optical path is not included in the plurality of optical paths for which the degree of sharing is calculated, the number of the shared communication paths included in the optical path assigning means is minimized. The optical network control device according to Appendix 2, which assigns the first optical path to an alternative path.

(Appendix 4) The accommodation traffic dividing means is further provided, and the optical path assigning means selects a plurality of allocation routes independent of each other to allocate the first optical path, and divides the requested traffic into the plurality of allocation routes. The optical network control device according to Appendix 2 or 3, which is accommodated in a plurality of the first optical paths and the accommodation traffic dividing means divides the transfer rate of the requested traffic into the number of the plurality of allocated routes.

(Appendix 5) Further, a wavelength candidate limiting means for designating an assigned wavelength slot region to which the wavelength slots of the plurality of first optical paths belong in common is provided, and the optical path assigning means of the plurality of first optical paths. The optical network control device according to any one of Supplementary note 2 to 4, which determines that the wavelength slot is included in the assigned wavelength slot region.

(Appendix 6) The first optical path information, which is information about the paths and wavelength slots of the plurality of first optical paths determined by the optical path assigning means, and the second light selected by the second path selecting means. The optical network control device according to any one of Appendix 2 to 5, further comprising a setting notification means for notifying the optical node device of the second optical path information which is information about the path.

(Appendix 7) The optical node device setting notification means that receives the first optical path information and the second optical path information from the setting notification means included in the optical network control device described in Appendix 6 and the request traffic are configured. An optical path switching means that sends signal light modulated based on a client signal to an optical communication path, and light that controls the optical path switching means based on the first optical path information and the second optical path information. An optical node device having a node device control means, and.

(Appendix 8) The number of shared communication paths shared by a plurality of first optical paths set in a route candidate including a specific communication path in which duplication of a plurality of optical paths is allowed. An optical path setting method in which a second optical path is selected in advance for the path that minimizes.

(Appendix 9) When setting the plurality of first optical paths, among the communication paths constituting the optical network, allocation route candidates to be included in the communication path to which the optical path is allocated are determined, and the allocation route candidates are included. The degree of sharing of the plurality of optical paths assigned to the path candidates is calculated, and based on the degree of sharing, the paths and wavelength slots of the plurality of first optical paths accommodating the request traffic are determined, and the second light When selecting a path in advance, the shared communication path shared by the plurality of first optical paths is extracted, and the second optical path is selected as the path that minimizes the number of included shared communication paths. The optical path setting method described in 8.

(Appendix 10) A plurality of allocation paths independent of each other to which the first optical path is assigned are selected, and the request traffic is accommodated in the plurality of first optical paths divided into the plurality of allocation paths, and the request traffic is accommodated in the plurality of first optical paths. The optical path setting method according to Appendix 9, which divides the transfer rate of the above into the number of the plurality of allocated routes.

(Supplementary Note 11) The optical network according to any one of Supplementary note 1 to 6, wherein the specific communication path is a communication path connected to an optical node device whose number of paths is smaller than the number of the plurality of first optical paths. Control device.

(Appendix 12) The shared metric calculation means is based on at least one of the number of communication paths shared by the plurality of optical paths, the number of shared optical paths, and the number of shared optical paths for each type. The optical network control device according to any one of Supplementary note 2 to 6 for calculating the degree of sharing.

(Appendix 13) The optical network control device according to Appendix 4, wherein the accommodation traffic dividing means determines the ratio for dividing the transfer rate based on the frequency utilization efficiency of the plurality of first optical paths.

(Appendix 14) When the second optical path is not included in the plurality of optical paths for which the degree of sharing is calculated, the first alternative path has the minimum number of included shared communication paths. The optical path setting method according to Appendix 9 or 10 for assigning an optical path.

(Appendix 15) An assigned wavelength slot region to which the wavelength slots of the plurality of first optical paths belong in common is specified, and it is determined that the wavelength slots of the plurality of first optical paths are included in the allocated wavelength slot region. The optical path setting method according to any one of Supplementary note 9, 10, and 14.

(Supplementary note 16) The specific communication path is any one of Supplementary note 8 to 10, 14, and 15 which is a communication path connected to an optical node device whose number of paths is smaller than the number of the plurality of first optical paths. Optical path setting method described in.

(Appendix 17) The degree of sharing is calculated based on at least one of the number of communication paths shared by the plurality of optical paths, the number of shared optical paths, and the number of shared optical paths for each type. The optical path setting method according to any one of Appendix 9, 10, and 14 to 16.

(Appendix 18) The optical path setting method according to Appendix 10, wherein the ratio for dividing the transfer rate is determined based on the frequency utilization efficiency of the plurality of first optical paths.

(Appendix 19) An optical path setting means for setting a plurality of first optical paths in a route candidate including a specific communication path in which duplication of a plurality of optical paths is allowed for a computer, and the plurality of first optical paths A program for functioning as an optical path selection means for preselecting a second optical path in a path that minimizes the number of shared communication paths to be shared.

(Appendix 20) Among the communication paths constituting the optical network, the optical path setting means includes a route candidate limiting means for determining an allocation route candidate to be included in the communication path to which the optical path is allocated, and the route including the allocation route candidate. A shared metric calculation means that calculates the degree of sharing of a plurality of optical paths to be assigned to candidates, and the optical path that determines the path and wavelength slot of the plurality of first optical paths that accommodate the request traffic based on the degree of sharing. The optical path selection means includes the allocation means, and the number of the communication path extraction means for extracting the shared communication path shared by the plurality of first optical paths and the number of the shared communication paths included in the optical path selection means are minimized. The program according to Appendix 19, which has a second path selection means for selecting the second optical path as a path.

Although the invention of the present application has been described above with reference to the embodiment, the invention of the present application is not limited to the above embodiment. Various changes that can be understood by those skilled in the art can be made within the scope of the present invention in terms of the structure and details of the present invention.

This application claims priority on the basis of Japanese application Japanese Patent Application No. 2016-0817772 filed on April 15, 2016, and incorporates all of its disclosures herein.

10, 100, 101, 102 Optical network controller 11 Optical path setting means 12 Optical path selection means 110 Route candidate limiting means 120 Shared metric calculation means 130 Optical path allocation means 140 Communication path extraction means 150 Recovery path selection means 160 Setting notification interface 170 Containment traffic dividing means 180 Wavelength candidate limiting means 200, 201 Optical network 300 to 309 Optical node device 310 Optical node device setting notification interface 320 Optical node device control means 321 Wavelength control means 322 Direction control means 330, 340 Optical path switching means 331, 341 Client device 332, 342 Variable optical transponder 333, 343 Variable large particle size switching device 401 Optical fiber communication path 410 Communication path 501-504 Shared communication path 1000, 1001 Optical communication system

Claims (10)

An optical path setting means for setting a plurality of first optical paths in a route candidate including a specific communication path that allows duplication of a plurality of optical paths, and an optical path setting means.
An optical network control device including an optical path selection means for preliminarily selecting a second optical path as a path that minimizes the number of shared communication paths shared by the plurality of first optical paths. In the optical network control device according to claim 1,
The optical path setting means
Of the communication paths that make up the optical network, the route candidate limiting means that determines the allocation route candidates to be included in the communication path to which the optical path is allocated, and the route candidate limiting means.
A shared metric calculation means for calculating the degree of sharing of a plurality of optical paths assigned to the route candidate including the assigned route candidate, and
Based on the shared degree, the plurality of first light path allocation means that determine a path and wavelength slot of light paths to accommodate the request traffic, has a capital,
The optical path selection means is
A communication path extraction means for extracting a shared communication path shared by the plurality of first optical paths, and
An optical network control device including a second path selection means for selecting the second optical path as a path that minimizes the number of shared communication paths included.


In the optical network control device according to claim 2.
When the second optical path is not included in the plurality of optical paths for which the degree of sharing is calculated, the optical path assigning means is set to an alternative path that minimizes the number of the shared communication paths included. An optical network controller that allocates a first optical path. In the optical network control device according to claim 2 or 3.
Further equipped with containment traffic division means,
The optical path assigning means selects a plurality of allocation paths independent of each other to which the first optical path is assigned, and accommodates the request traffic in the plurality of first optical paths divided into the plurality of allocation paths.
The accommodation traffic dividing means is an optical network control device that divides the transfer rate of the requested traffic into the number of the plurality of allocated routes. In the optical network control device according to any one of claims 2 to 4.
Further provided with wavelength candidate limiting means for designating an assigned wavelength slot region to which the wavelength slots of the plurality of first optical paths belong in common.
The optical path assigning means is an optical network control device that determines that the wavelength slots of the plurality of first optical paths are included in the assigned wavelength slot region. In the optical network control device according to any one of claims 2 to 5.
The first optical path information, which is information about the paths and wavelength slots of the plurality of first optical paths determined by the optical path assigning means, and the information about the second optical path selected by the second path selecting means. An optical network control device further comprising a setting notification means for notifying a second optical path information to an optical node device. An optical node device setting notification means that receives the first optical path information and the second optical path information from the setting notification means included in the optical network control device according to claim 6.
An optical path switching means for transmitting signal light modulated based on a client signal constituting the required traffic to an optical communication path, and
An optical node device having an optical node device control means that controls the optical path switching means based on the first optical path information and the second optical path information. A plurality of first optical paths are set for a route candidate including a specific communication path where duplication of a plurality of optical paths is allowed.
An optical path setting method in which a second optical path is selected in advance as a path that minimizes the number of shared communication paths shared by the plurality of first optical paths. In the optical path setting method according to claim 8,
When setting the plurality of first optical paths,
Among the communication paths that make up the optical network, determine the allocation route candidates to be included in the communication path to which the optical path is allocated.
The degree of sharing of a plurality of optical paths to be assigned to the route candidate including the allocation route candidate is calculated.
Based on the degree of sharing, the paths and wavelength slots of the plurality of first optical paths accommodating the required traffic are determined.
When selecting the second optical path in advance,
The shared communication path shared by the plurality of first optical paths is extracted, and the shared communication path is extracted.
An optical path setting method for selecting the second optical path as a path that minimizes the number of shared communication paths included. An optical path setting means for setting a plurality of first optical paths in a route candidate including a specific communication path that allows the computer to overlap a plurality of optical paths, and a shared communication shared by the plurality of first optical paths. the path number of the road is minimized, the light path selection means for preselecting a second optical path, the program to function as.

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