JP2010199891A - Network design management method and apparatus, and optical network system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve the optimum arrangement of a wavelength and a route and shortening of optical path setting time in a transparent optical network. <P>SOLUTION: A set number of routes are reserved as reserved optical paths for the ground beforehand, the route and the wavelength are allocated and reserved for each reserved optical path, and ground information, wavelength information and route information are preserved for each reserved optical path. When an optical path opening request is acquired, the reserved optical path having the same ground as the optical path opening request and the using state information of the reserved optical path are retrieved, an unused reserved optical path is allocated to an opening request optical path, an optical path setting message is notified to respective node devices configuring the route of the reserved optical path, wavelength switching setting is performed, and the optical path is opened. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a network design management method and apparatus and an optical network system, and more particularly, to a network design management method and apparatus in a network composed of node devices that switch optical signals according to wavelength and do not perform wavelength conversion, and optical. Related to network system.

  Research and development of large-capacity optical network systems are progressing against the background of increasing demand for lines. As shown in FIG. 15, a transparent optical network composed of node devices that perform only switching according to the wavelength of light without performing regenerative relaying or wavelength conversion of optical signals can realize an economical optical network system. In particular, studies are in progress (see, for example, Non-Patent Document 1). The following methods have been proposed as a method for accommodating optical paths in such a transparent optical network. As shown in FIG. 16, the optical path design management method searches for an empty path and an empty wavelength that can be opened, every time an optical path setting request occurs, and further, an optical signal-to-noise ratio ( This method evaluates the effect of transmission degradation factors such as OSNR (Optical Signal Noise Ratio) and Polarization Mode Dispersion (PMD) on communication quality, and sets the optical path when transmission characteristics can be maintained. (For example, refer nonpatent literature 2).

C. T. Politi, et al., "Integrated Design and Operation of a Transparent Optical Network: A systematic Approach to Include Physical Layer Awareness and Cost Function", IEEE Com. Mag., Pp. 40-47, February 2007. Y. Huang, et al., "Connection Provisioning With Transmission Impairment Consideration in Optical WDM Networks With High-Speed Channels", J. Light Techno., Vol. 23, NO. 3, pp.982-993, March, 2005

  However, in a transparent optical network, there is a limitation in accommodation design because the signal light wavelength does not change in each optical path (route from the node device serving as the signal start point to the node device serving as the end point). For this reason, in the conventional optical network design management method, problems occur in wavelength and route optimization and optical path setting speed.

  That is, in the conventional design management method for a transparent optical network, whenever an optical path establishment request is generated as shown in FIG. 16, first, an empty path and an empty wavelength for setting an optical path are searched, and this empty path is further searched. This is a design management method in which the wavelength and path are assigned to the optical path after determining the influence of the transmission characteristics on the signal light degradation. In this design management method, one wavelength and one path are allocated for each request for opening an optical path, so that a local optimum solution is obtained and the optical network as a whole cannot always accommodate an optimized wavelength and path. For example, in the conventional optical network design management method, as shown in FIG. 17A, the wavelength λ1 is set for the optical path of the node equipment A-C, the wavelength λ2 is set for the optical path of the node equipment AB, and the node equipment B-C. There is a possibility that the wavelength λ3 is assigned to the optical path. Here, when an optical path is further set for the node equipment A-C, if a wavelength of λ2 or λ3 is assigned to this, a wavelength collision occurs, so it is impossible to set such an optical path. . For this reason, the fourth wavelength λ4 is required for the optical path newly set in the node equipment A-C (note that the wavelength is added to the optical path of the node equipment A-C, as shown in FIG. 17B). If wavelength λ2 is assigned to the optical path of node device A-B and wavelength λ2 is assigned to the optical path of node device BC, no wavelength collision occurs when an optical path is added to node device A-C. Three wavelengths are sufficient).

  Further, since it is necessary to search for an empty line and an empty wavelength from the entire optical network for each request for opening an optical path, it is difficult to quickly open an optical path.

  The present invention has been made in view of the above points, and in a transparent optical network, a network design management method and apparatus, and an optical network system for realizing optimal arrangement of wavelengths and paths, and shortening of optical path setting time The purpose is to provide.

  FIG. 1 is a diagram for explaining the principle of the present invention.

According to the present invention (claim 1), transmission degradation information and wavelength allocation in a transmission line or node device are applied to an optical network having a mesh configuration configured of node devices that switch optical signals according to wavelength and do not perform wavelength conversion. An optical network design management method in an optical network design management apparatus that allocates an optical path based on information,
Optical network design means
In advance, a set number of routes are reserved as reserved optical paths for the ground, which is a combination of a node device that is a starting point and an end device that is an optical path (step 1).
For each reserved optical path, route and wavelength allocation reservation is performed (step 2),
For each reserved optical path, perform an optical network design step for storing ground information, wavelength information, and route information in the accommodation design result database (step 3),
Optical network management means
When an optical path opening request is acquired (step 4), a reserved optical path having the same ground as the optical path opening request is searched from the accommodation design result database (step 5).
Search the reserved optical path use state information from the resource management information database (step 6),
An unused optical path among the reserved optical paths is assigned to the opening request optical path (step 7),
An optical path setup message is notified to each node device constituting the reserved optical path route, and each node device constituting the reserved optical path route uses the wavelength of the optical path setup message to determine the ground optical path. The wavelength switching of each node device is set to be configured (step 8). The optical network management step is performed.

  According to the present invention (claim 2), when the optical network management means distributes the optical path setting message, the optical path setting message is distributed to the node device that is the starting point of the reserved optical path, and the node device Wavelength switching is set by sequentially distributing to the end node device along the route of the reserved light path to the node devices constituting the reserved light path.

  According to the present invention (Claim 3), when the optical network management means distributes the optical path setting message, the optical path setting message is directly distributed to the node devices constituting the reserved optical path. Sets wavelength switching.

  FIG. 2 is a principle configuration diagram of the present invention.

According to the present invention (Claim 4), transmission degradation information and wavelength allocation in a transmission line or node device are applied to an optical network having a mesh configuration configured by node devices that switch optical signals according to wavelength and do not perform wavelength conversion. An optical network design management device that assigns an optical path based on information,
An optical network design means 100 and an optical network management means 200;
The optical network design means 100
An optical path reservation unit 121 that reserves a set number of optical paths as reserved optical paths in advance for each ground, which is a combination of a node device that is a starting point and an end point of an optical path;
A route / wavelength assignment unit 122 for making a reservation of route and wavelength assignment for each reserved optical path;
Output means 130 for storing ground information, wavelength information, and path information in the accommodation design result database 101 for each reserved light path;
Have
The optical network management means 200
For each optical path opening request, a reserved optical path having the same ground as the opening requested optical path is searched from the accommodation design result database 101, and further, usage status information of the reserved optical path is searched from the resource management information database 102. Database search means 220;
As a result of searching the resource management information database 102, the resource management information database is updated with the usage status information of the optical path requesting the establishment of a reserved optical path that is not in use as “used status”, and the accommodation design based on the reserved optical path The optical path setting message set with the wavelength information and path information read from the result database 101 is notified to each node apparatus constituting the reserved optical path path, and each node apparatus configuring the reserved optical path path is notified of the wavelength. Wavelength switching setting means 230 for setting wavelength switching of the node device so as to constitute a ground optical path based on the wavelength of information.

Further, according to the present invention (Claim 5), when the optical network management unit 200 is provided in each node device, the optical path establishment request is related to the optical device provided in the start-point node device of the establishment request optical path. When done for network management means,
The optical network management means 200
An optical path setting message is sequentially distributed from the starting node device along with the reserved optical path of the optical path setting message to the end node device, and the optical path setting of the node device constituting the reserved optical path is performed. Means to do.

According to the present invention (Claim 6), when one network management unit 200 is installed for an optical network, when an optical path establishment request is made to the network management unit,
The optical network management means 200
Means for directly distributing the optical path setting message to all the node devices constituting the route of the reserved optical path of the optical path setting message and setting the optical path of the node device constituting the reserved path;

The present invention (Claim 7) is an optical network system having a mesh configuration composed of node devices that switch optical signals according to wavelength and do not perform wavelength conversion.
An optical network design means, and an optical network management means, comprising an optical network design management device for assigning an optical path based on transmission degradation information and wavelength assignment information in a transmission path or node device,
Optical network design management device
Optical path reservation means for reserving a preset number of optical paths as reserved optical paths for each ground, which is a combination of a node device that is a starting point of an optical path and a node device that is an end point,
Route / wavelength allocation means for performing reservation reservation of route and wavelength for each reserved optical path;
Output means for storing ground information, wavelength information, and route information in the accommodation design result database for each reserved optical path;
An optical network design means comprising:
For each optical path opening request, search for a reserved optical path having the same ground as the opening request optical path from the accommodation design result database, and further search a database search for searching the usage status information of the reserved optical path from the resource management information database Means,
As a result of the search of the resource management information database, the resource management information database is updated with the usage status information of the optical path requesting optical path of the reserved optical path that is not in use as “usage status”, and the accommodation design result based on the reserved optical path An optical path setting message in which the wavelength information and path information read from the database are set is notified to each node device constituting the reserved optical path route, and each node device constituting the reserved optical path route is notified of the wavelength information. Wavelength switching setting means for setting wavelength switching of the node device so as to constitute a ground optical path based on the wavelength; and
And an optical network management means.

According to the present invention (Claim 8), when the optical network management means is provided in each node device, the optical network management means in which the optical path opening request is provided in the starting node device of the opening request optical path. When done against
Optical network management means
The optical path setting message is sequentially distributed from the start node device provided along with the reserved optical path of the optical path setting message to the end node device, and the optical path setting of the node device configuring the reserved optical path is performed. Including means.

According to the present invention (Claim 9), when one network management unit is installed for an optical network, an optical path establishment request is made to the network management unit.
Optical network management means
Means for directly distributing the optical path setting message to all the node devices constituting the route of the reserved optical path of the optical path setting message and setting the optical path of the node device constituting the reserved path;

  In the present invention, a predetermined number of routes are reserved as reserved optical paths in advance for each ground (between node devices), and a route and wavelength allocation reservation is made for each reserved path. Since the reserved optical path assigns paths and wavelengths in advance before setting the actual optical path, the wavelength collision as shown in FIG. 17 (a) is reduced, and the wavelength as shown in FIG. 17 (b) is reduced. Thus, a design capable of setting many optical paths can be performed.

  Also, in the present invention, by preparing a reserved optical path in which a route and a wavelength are set in advance for each ground, when a request for opening an optical path is generated, a reserved optical path that meets the requirements (ground) of the request is generated. Wavelength information and route information can be provided in a short time.

It is a figure for demonstrating the principle of this invention. It is a principle block diagram of this invention. It is a flowchart of the network design operation | movement of the network design management method in the 1st Embodiment of this invention. It is an example (the 1) of the optical network management system in the 1st Embodiment of this invention. It is a flowchart of the network management operation | movement of the network design management method in the 1st Embodiment of this invention. It is an example (the 2) of the optical network management system in the 1st Embodiment of this invention. It is a path establishment sequence by the 2 way signaling system in the 2nd Embodiment of this invention. It is a path opening sequence in the 3rd Embodiment of this invention. It is a block diagram of the optical network design management apparatus in the 4th Embodiment of this invention. It is a block diagram of the optical network design function part in the 4th Embodiment of this invention. It is a block diagram of the optical network management function part in the 4th Embodiment of this invention. It is a block diagram of the optical network design management apparatus in the 5th Embodiment of this invention. It is a block diagram of the optical network design management apparatus in the 6th Embodiment of this invention. It is a block diagram of the optical network system in the 7th Embodiment of this invention. It is a figure which shows the outline | summary of a transparent optical network. It is a figure which shows the network design method of the conventional transparent optical network. It is a figure which shows the subject of a transparent optical network.

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

  First, terms used below will be described.

  The “node device” in this specification is a device that switches signal light without changing the wavelength. For example, an optical cross connect, an optical switch, a 2-D MEMS (Micro Electro Mechanical Systems) switch, a 3-D This applies to MEMS switches.

  The “optical network” in this specification is a connection of these nodes in a mesh shape.

  The “optical path” in this specification is also generally called a wavelength path, and the start point and the end point are node devices. For example, a TDM path, Ethernet (registered trademark), MPLS Label Switched Path, VCAT (Virtual Concatenation), Link Aggregation, or the like grouped as a client signal is superimposed on this optical path.

  The “optical path setup message” in this specification is a message including control information for allocating resources or assigning resources, optical path route information, and wavelength information.

  Further, the “resource assignment message” in this specification is a message including control information for assigning resources to the node device.

  In addition, “wavelength switching setting” in this specification means that an optical signal demultiplexed from a wavelength multiplexed signal light input from an input optical transmission line port into a signal of each wavelength is transmitted to a predetermined output optical transmission line port. Setting to output at a wavelength (optical cross-connect).

  The “optical network design device and optical network management device (optical network design management device)” in this specification is a device that selects and sets a wavelength and a route in response to an optical path opening request. (Network Management System), NRM (Network Resource Manager), PCE (Path computation Element), EMS (Element Management System), etc. are applicable.

  Further, the “client device” in this specification is a device that terminates or relays a client signal before being superimposed on an optical path, and includes, for example, a TDM cross-connect, a PBT (Provider Backbone Transport) device, an MSPP (Multi- Service Provisioning Platform), router, T-MPLS (Transport-Multi Protocol Switching), Layer 2 switch, etc. are applicable.

  Of the node devices, the one that becomes the start point, the relay point, and the end point of the optical path are referred to as Ingres (start point node device), Transit (relay node device), and Egress (end point node device), respectively. As for Ingress and Egress, when the optical network design apparatus or the optical network management apparatus performs optical path setting, what is set first is called Ingress, and what is set later is called Egress.

[First Embodiment]
This embodiment corresponds to claim 1.

  FIG. 3 shows the operation of the optical network design management method according to the first embodiment of the present invention.

In the optical network design method of the present invention,
・ Optical network physical topology information;
・ Number of ground-to-ground optical path settings;
-Basic information on transmission degradation information;
・ Transmission method information;
Node device configuration information;
・ Reliability class information;
Based on the above, accommodation design is performed, and route information and wavelength allocation information for each optical path are determined. As a result of the accommodation design, a path and wavelength assigned are referred to as an “optical path”.

  Here, “physical topology information” represents connection configuration information between a node device and a transmission path. The “number of ground optical path settings” is the number of optical path settings, and is a numerical value determined in advance based on external factors such as demand or demand prediction. “Transmission degradation information” refers to degradation information in a node device and degradation information of a transmission path (optical fiber), and specifically includes OSNR, PMD, power loss, dispersion, nonlinear effect, crosstalk, etc. It is information about deterioration characteristics. “Transmission method information” is information related to the transmission method of signals transmitted through the optical path, specifically, various transmissions such as DQPSK (Differential Quadrature Phase Shift Keying), OFDM (Orthogonal Frequency Division Multiplexing), and intensity modulation. It is method information. “Node device configuration information” indicates UNI port route restriction information. “Reliability class information” refers to path redundancy classes such as a 1 + 1 protection class that secures the first path and the second path, and an unprotected class of only the first path.

In optical network design,
1) All route search processing (step 101);
2) Candidate route filtering process (step 102);
3) Route / wavelength assignment processing (step 103);
These three operations are sequentially performed.

  Step 101) The all-route search process searches for all routes in the optical network based on the physical topology information of the optical network. Examples of the route search method include a width priority search algorithm and a depth priority algorithm.

  Step 102) The candidate route filtering process calculates a degradation value on the route from the routes obtained in Step 101, and selects a route within the transmission degradation restriction range. Here, a route is selected based on transmission degradation information that is characteristic information of the node device and the transmission path. At that time, since degradation factors such as PMD have different effects depending on the transmission method, the degradation value on the path is evaluated in more detail using transmission method information. In addition, routes that cannot be realized due to port route restrictions in the node device are excluded from route candidates based on the node device configuration information.

  Step 103) The route / wavelength assignment process is to determine the route / wavelength of the optical path based on the number of ground-to-ground optical path settings among the routes narrowed down in Step 102. At that time, with the objective function of minimizing the equipment cost such as wavelength, transmission path, and port of node equipment, wavelength allocation in the optical network is determined under the constraint condition without wavelength conversion, and ground information, wavelength information, route Store the information in the accommodation design result database. An example of the route / wavelength assignment method is a mixed integer programming method. As a formulation method without wavelength conversion, for example, there is a method described in “Michal Pioro: Routing, Flow, and Capacity Design in Communication and Computer Networks. Morgan Kaufmann Publishers 2004”. Depending on the degree of reliability requirement, it may be necessary to prepare a spare optical path in case of failure. Therefore, for optical paths that are scheduled for reliability requirements such as duplexing based on reliability class information Prepare a detour route.

  FIG. 4 shows an example of the optical network management system according to the first embodiment of the present invention, and shows a state in which the route and wavelength allocation are determined for the reserved optical path. Through the above, route allocation is determined for the reserved optical path.

  On the other hand, the optical network management method shown in FIG. 5 assigns, for each path establishment request, a reserved optical path having the same ground as the establishment request optical path. Specifically, when there is a path opening request (step 201), a reservation light path having the same ground as the opening request light path is searched from the above-described accommodation design result database (step 202), and then the searched reservation light is searched. Based on the path, an unused optical path is selected from the matching reserved paths from the resource management information database that manages the state of the resource (steps 203 to 205), and the route assigned to the unused reserved optical path Information and wavelength information are allocated to the opening request optical path (step 206). For allocation to the optical path for requesting opening, the wavelength switching setting of each node device is performed so that the corresponding path can be configured with the corresponding wavelength. FIG. 6 is an example of the optical network management method in the first embodiment of the present invention, and shows a state in which reserved optical paths are allocated.

  According to the procedure described above, the optical network design management method according to claim 1 is realized.

[Second Embodiment]
This embodiment corresponds to claim 2.

  FIG. 7 shows a path establishment sequence in the 2-way signaling method according to the second embodiment of the present invention. In the following description, it is assumed that an optical path establishment request is made with the node equipment A (Ingress) and the node equipment C (Egress) as the ground.

  When an optical path establishment request is made (step 301), the optical network design management device searches the accommodation design result database, and searches for a reserved path having the ground from the node device A to the node device C (step 302). Further, the optical network design management apparatus searches the resource management information database, selects one of the reserved optical paths that is not used (step 303), and also selects the wavelength of the selected reserved path. Information and route information are output (step 304). Thereafter, the optical network design management device sequentially distributes an optical path setting message including route information and wavelength information from the start node device A to the end node device C along the route of the reserved optical path to reserve resources. (Step 305). Next, the received end node device C performs wavelength switching setting by sequentially distributing the resource allocation message to the start point node device A along the route of the reserved optical path (step 306), and is selected in step 304. The resource management information database is updated with the optical path as “in use” (step 307).

  According to the procedure described above, the optical network design management method according to claim 2 is realized.

[Third Embodiment]
This embodiment corresponds to claim 3.

  FIG. 8 shows a path opening sequence according to the third embodiment of the present invention. In the following description, it is assumed that an optical path establishment request is made with the node equipment A (Ingress) and the node equipment C (Egress) as the ground.

  When an optical path establishment request is made (step 401), the optical network design management device searches the accommodation design result database, and searches for a reserved path having a ground from the node device A to the node device C (step 402). Further, the optical network design management device searches the resource management information database (step 403), selects one of the reserved optical paths from the unused ones, and also selects the wavelength of the selected reserved path. Information and route information are output (step 40). Thereafter, the optical network design management device performs wavelength switching setting by directly distributing an optical path setting message including route information and wavelength information to all the node devices constituting the reserved optical path, and sends a response to the optical network. Return to the design management device (step 405).

  The optical network design management method according to claim 3 is realized by the procedure described above.

[Fourth Embodiment]
This embodiment corresponds to claim 4.

  In this embodiment, a network design management apparatus will be described.

  The network design management apparatus includes an optical network design function unit 100 and an optical network management function unit 200, as shown in FIG. Hereinafter, the description will be divided into the optical network design function unit 100 and the optical network management function unit 200.

  FIG. 10 shows the configuration of the optical network design function unit in the fourth embodiment of the present invention.

  The optical network design function unit 100 shown in the figure includes an input unit 110, a calculation unit 120, and an output unit 130.

  The input unit 110 inputs the following information and passes it to the calculation unit 120.

・ Optical network physical topology information;
・ Number of ground-to-ground optical path settings;
-Basic information on transmission degradation information;
・ Transmission method information;
Node device configuration information;
・ Reliability class information;
The details of each of the above input information are as described in the first embodiment.

  The calculation unit 120 includes an all-route search function unit 121, a candidate route filtering function unit 122, and a route / wavelength assignment function unit 123.

  The all-route search function unit 121 of the calculation unit 120 temporarily stores each piece of information input from the input unit 110 in a memory (not shown), and then stores the information in the optical network based on the physical topology information of the optical network. Search all routes. Examples of the route search method include a width priority search algorithm and a depth priority algorithm.

  The candidate route filtering function unit 122 of the calculation unit calculates a deterioration value on the route among the routes searched by the all-route search function unit 121, and selects a route within the transmission deterioration restriction range. Here, a route is selected based on the input node device and transmission degradation information which is characteristic information of the transmission route. At that time, since degradation factors such as PMD have different effects depending on the transmission method, the degradation value on the path is evaluated in more detail using the input transmission method information. Also, a route that cannot be realized due to port route restrictions in the node device is excluded from the route candidates by the input node device configuration information.

  The route / wavelength assignment function unit 123 of the calculation unit 120 determines the route / wavelength of the optical path based on the number of ground-to-ground optical path settings among the routes narrowed down by the candidate route filtering function unit 122. At that time, wavelength allocation in the optical network is determined under the constraint condition without wavelength conversion, with the objective function of minimizing the equipment cost such as wavelength, transmission path, node device port and the like. An example of the route / wavelength assignment method is a mixed integer programming method. As a formulation method without wavelength conversion, for example, there is a method described in “Michal Pioro: Routing, Flow, and Capacity Design in Communication and Computer Networks. Morgan Kaufmann Publishers 2004”. Depending on the degree of reliability requirement, it may be necessary to prepare a spare optical path in case of a failure. Therefore, based on the reliability class information, the optical path scheduled for reliability such as duplexing is bypassed. Prepare a route.

  The output unit 130 stores ground information, wavelength information, and route information for each reserved light path in the accommodation design result database (DB) 101 as reserved path information.

  Next, the optical network design function unit 200 will be described.

  FIG. 11 shows the configuration of the optical network management function unit in the fourth embodiment of the present invention.

  The optical network management function unit 200 shown in FIG. 1 includes an input unit 210, a database search unit 220, a wavelength switching setting unit 230, and a database rewrite unit 240. The resource management information DB 102 connected to the database search unit 220 manages used / unused for each reservation destination path.

  The input unit 210 acquires opening request path information (ground information) and passes it to the database search unit 220.

  The database search unit 220 searches the accommodation design result DB 101 for a reserved light path having the same ground as the opening request path. Furthermore, based on the reserved light path, the usage status information of the reserved light path is searched from the resource management information DB 102.

  The wavelength switching setting unit 230 determines whether there is a reserved optical path that matches the optical path establishment request in the reserved optical path read from the accommodation design result DB 10, and if there is not, there is no compatible reserved optical path. The optical path opening request source is notified. If there is, the usage status information in the resource management information DB 102 is referred to based on a suitable reserved optical path, and it is determined whether there is an unused optical path. The wavelength / route of the unused reserved optical path is notified to the optical transmission apparatus and optical reception apparatus on the optical network 300, and the wavelength switching setting is performed.

  The database rewriting unit 240 updates the resource management information DB 102 with the usage status information of the reserved optical path being used as “usage status”.

  According to the configuration of the optical network design management apparatus described above, the optical network design management apparatus according to claim 4 is realized.

[Fifth Embodiment]
This embodiment corresponds to claim 5.

  FIG. 12 shows the configuration of an optical network design management apparatus according to the fifth embodiment of the present invention. This is an example in which the optical network management function unit 200 of the optical network design management apparatus shown in FIG. Each node device has a control unit, a switch function unit, a wavelength demultiplexing function unit, and an Add / Drop function unit, and a client device is connected to the Add / Drop function unit. Each node device is connected by an optical fiber.

  In the above configuration, the description will be made assuming that the optical path establishment request is made to the optical network management function unit 200A provided in the start node device (Ingress) of the optical path of the optical path establishment request. When the optical network management function unit 200A acquires the optical path establishment request, the optical network management function unit 200A sequentially distributes an optical path setting message from the start point node device to the end point node along the route of the reserved optical path. The configuration of the optical network management function unit 200 is the same as that shown in FIG.

In the example of FIG. 12, when an optical path establishment request is made, the optical network management function unit 200A searches the accommodation design result database 101, and searches for a reserved path having the ground from the node device A to the node device C. Further, the optical network management function unit 200A searches the resource management information database 102, selects one unused optical path from among the reserved optical paths, and the wavelength information of the selected reserved path and Output route information. Then, the optical network management function unit 200A sequentially distributes the optical path setting message including the wavelength information and the route information from the start point node device A to the end point node device C along the route of the reserved optical path. The optical network design management apparatus according to claim 5 is realized by the configuration of the optical network design management apparatus that performs optical path setting.

[Sixth Embodiment]
This embodiment corresponds to claim 6.

  FIG. 13 shows the configuration of an optical network design management apparatus according to the sixth embodiment of the present invention. In the figure, one optical network management function unit 200 of the optical network design management apparatus is installed for the optical network, and an optical path establishment request is made to the optical network management function unit 200. The configuration of the optical network management function unit 200 is the same as that shown in FIG.

  In the following description, it is assumed that an optical path setting request is made to the optical network management function unit 200 with the node device A (Ingress) and the node device C (Egress) as the ground.

  When an optical path establishment request is made, the optical network management function unit 200 searches the accommodation design result database 101 and searches for a reserved path having a ground from the node device A to the node device C. Further, the optical network management function unit 200 searches the resource management information database 102, selects one of the reserved optical paths from the unused optical paths, and the wavelength of the selected reserved path. Information and route information are output. Then, the optical network management function unit 200 directly distributes the optical path setting message including the wavelength information and the path information to all the node apparatuses A, B, and C that constitute the reserved optical path, so that the light of each node apparatus Set the path.

  The optical network design management apparatus according to the sixth aspect is realized by the configuration of the optical network design management apparatus.

[Seventh Embodiment]
This embodiment corresponds to claim 7.

  FIG. 14 shows the configuration of an optical network system in the seventh embodiment of the present invention.

  The optical network system shown in the figure includes an optical network design management device 10, an optical transmission device 310, node devices 320, 330, and 340, and an optical reception device 350 that are connected to the accommodation design result DB 101 and the resource management DB 102. The device 310, the node devices 320, 330, and 340 and the optical receiving device 350 are connected by an optical fiber 360. The optical network has a mesh configuration including node devices that have a function of switching an optical signal according to a wavelength and that do not perform wavelength conversion. The optical network design management device 10 includes an optical network design function unit 100 and an optical network management function unit 200, and their configurations are as shown in FIGS.

  The optical network design function unit 100 of the optical network design management apparatus 10 searches for all paths in the optical network based on the physical topology information of the optical network using a breadth-first search algorithm or a depth-first algorithm. Next, among the searched paths, a degradation value on the path is calculated, and a path within the transmission degradation constraint range is selected based on transmission degradation information that is characteristic information of the node device and the transmission path. At that time, since degradation factors such as PMD have different effects depending on the transmission method, the degradation value on the path is evaluated in more detail using transmission method information. In addition, routes that cannot be realized due to port route restrictions in the node device are excluded from route candidates based on the node device configuration information. Of the routes narrowed down in this way, the route / wavelength of the optical path is determined based on the number of ground-to-ground optical path settings. At that time, wavelength allocation in the optical network is determined under the constraint condition without wavelength conversion, with the objective function of minimizing the equipment cost such as wavelength, transmission path, node device port and the like. Depending on the degree of reliability requirement, it may be necessary to prepare a spare optical path in case of failure. Therefore, for optical paths that are scheduled for reliability requirements such as duplexing based on reliability class information Prepare a detour route. The ground information, wavelength information, and route information for each determined reserved light path are stored in the accommodation design result DB 101.

  The optical network management function unit 200 of the optical network design apparatus 10 assigns a reserved optical path having the same ground as the opening request optical path for each path opening request. Specifically, when there is a path opening request, a reserved optical path whose ground is the same as the opening request optical path is searched from the accommodation design result DB 101, and whether there is a reserved optical path that matches the optical path opening request in the reserved optical path. If not, the optical path establishment request source is notified that there is no suitable reserved optical path. If there is, the resource management information DB 102 is searched based on a suitable reserved light path, and the use state information of the reserved light path is referred to and it is determined whether there is an unused light path. Route information and wavelength information assigned to an unused reserved optical path are assigned to the opening request optical path. The allocation to the opening request optical path is performed by allocating the corresponding wavelength to the optical transmission device 310 and the optical receiving device 350, and setting the wavelength switching of the node devices 320, 330, and 340 so that the corresponding path can be configured with the corresponding wavelength. Do.

  The optical network system according to claim 7 is realized by the configuration of the optical network.

[Eighth Embodiment]
This embodiment corresponds to claim 8.

  Hereinafter, a description will be given with reference to FIG.

  In the system shown in the figure, a plurality of optical network management function units 200A, 200B, and 200C exist on the optical network, and these share the accommodation design result DB 101 and the resource management information DB 102. Node device A, node device B, and node device C are connected by an optical fiber. The optical network has a mesh configuration including node devices that have a function of switching an optical signal according to a wavelength and that do not perform wavelength conversion. The optical network design management device 10 includes an optical network design function unit 100 and an optical network management function unit 200, and their configurations are as shown in FIGS.

  In the following, an optical path setting request with the node device A (Ingress) and the node device C (Egress) as the ground is issued to the optical network management function unit 200A, and the optical network management function unit 200A becomes the start node. Assume that an optical path message is transmitted to the node equipment A.

  When an optical path establishment request is made, the optical network management function unit 200A searches the accommodation design result DB 101 and searches for a reserved path having the ground from the node equipment A to the node equipment C. Furthermore, the optical network management function unit 200A searches the resource management information database 102, selects one of the reserved optical paths that is not used, and wavelength information of the selected reserved path, Output route information. Thereafter, the optical network management function unit 200A sequentially distributes an optical path setting message including wavelength information and route information from the start point node device A to the end point node device C along the route of the reserved optical path. Set the optical path.

  The optical network system according to claim 8 is realized by the configuration of the optical network.

[Ninth Embodiment]
This embodiment corresponds to claim 9.

  Hereinafter, a description will be given based on FIG.

  In the system shown in the figure, an accommodation design result DB 101 and a resource management information DB 102 are connected to the optical network management function unit 200, and a plurality of node devices A, B, and C are connected to the optical network management device 200. Yes. Node devices A, B, and C are connected by optical fibers. The optical network has a mesh configuration including node devices that have a function of switching an optical signal according to a wavelength and do not perform wavelength conversion. The optical network design management device 10 includes an optical network design function unit 100 and an optical network management function unit 200, and their configurations are as shown in FIGS.

  In the following description, it is assumed that an optical path setting request is made to the optical network management function unit 200 with the node device A (Ingress) and the node device C (Egress) as the ground.

  When an optical path establishment request is made, the optical network management function unit 200 searches the accommodation design result DB 101 and searches for a reserved path having a ground from the node device A to the node device C. Further, the optical network management function unit 200 searches the resource management information DB 102, selects one of the reserved optical paths from the unused ones, and wavelength information and route of the selected reserved path. Output information. After that, the optical network management function unit 200 directly distributes the optical path setting message including the wavelength information and the route information to all the node apparatuses A, B, and C that constitute the reserved optical path, so that the optical of the node apparatus Set the path.

  The optical network system according to claim 9 is realized by the configuration of the optical network.

  Further, the operation of the optical network design function unit 100 and the optical network management function unit 200 of the optical network design management device 10 is constructed as a program and installed in a computer used as the optical network design management device, or the network is installed. It is possible to circulate through.

  Further, the constructed program can be stored in a portable storage medium such as a hard disk, a flexible disk, or a CD-ROM, and can be installed or distributed in a computer.

  The present invention is not limited to the above-described embodiment, and various modifications and applications can be made within the scope of the claims.

  The present invention is applicable to an optical path setting technique for an optical network.

100 optical network design means, optical network design function unit 101 accommodation design result database (DB)
102 Resource management information database (DB)
DESCRIPTION OF SYMBOLS 110 Input part 120 Calculation part 121 Optical path reservation means, All-route search function part 122 Candidate route filtering function part 123 Path | route / wavelength allocation means, Path | route / wavelength allocation function part 130 Output means, Output part 200 Optical network management means, Optical network Management function unit 220 Database search unit 230 Wavelength setting unit 234 Wavelength setting unit 240 Database rewriting unit 300 Optical network 310 Optical transmission device 320, 330 Node device 350 Optical reception device 360 Optical fiber

Claims (9)

Light that assigns an optical path based on transmission degradation information and wavelength assignment information in a transmission path or node device to an optical network with a mesh configuration that consists of node devices that switch optical signals according to wavelength and do not perform wavelength conversion An optical network design management method in a network design management device,
Optical network design means
In advance, a set number of routes are reserved as reserved optical paths for the ground, which is a combination of a node device that is the start point of an optical path and a node that is an end point,
Reservation of route and wavelength allocation for each reserved optical path,
For each reserved optical path, perform an optical network design step of storing ground information, wavelength information, and route information in a storage design result database,
Optical network management means
When an optical path opening request is acquired, a reserved optical path having the same ground as the optical path opening request is searched from the accommodation design result database,
Search the usage status information of the reserved light path from the resource management information database,
Of the reserved optical path, assign an unused optical path to the opening request optical path,
An optical path setup message is notified to each node device that constitutes the reserved optical path route, and each node device that constitutes the reserved optical path route sends the optical path to the ground at the wavelength of the optical path setup message. An optical network management step of setting wavelength switching of each node device to configure; and
An optical network design management method characterized by: When the optical network management means delivers the optical path setting message,
The optical path setup message is distributed to the node device that is the starting point of the reserved optical path, and from the node device to the node device that configures the reserved optical path, to the end node device along the route of the reserved optical path The optical network design management method according to claim 1, wherein setting of wavelength switching is performed by sequentially distributing. When the optical network management means delivers the optical path setting message,
The optical network design management method according to claim 1, wherein the optical path setting message sets wavelength switching by being directly distributed to a node device constituting the reserved optical path. Light that assigns an optical path based on transmission degradation information and wavelength assignment information in a transmission path or node device to an optical network with a mesh configuration that consists of node devices that switch optical signals according to wavelength and do not perform wavelength conversion A network design management device,
An optical network design means and an optical network management means,
The optical network design means includes:
Optical path reservation means for reserving a preset number of optical paths as reserved optical paths for each ground, which is a combination of a node device that is a starting point of an optical path and a node device that is an end point,
A path / wavelength allocation means for performing a reservation of a path and a wavelength for each reserved optical path;
Output means for storing ground information, wavelength information, and path information in the accommodation design result database for each reserved optical path;
Have
The optical network management means includes:
For each optical path opening request, a database that searches the reserved design result database for a reserved optical path having the same ground as the opening request optical path, and further searches the resource management information database for usage status information of the reserved optical path Search means;
As a result of the search of the resource management information database, the usage status information of the optical path requesting optical path for the reserved optical path that is not in use is updated to “usage status”, and the resource management information database is updated, and the accommodation design based on the reserved optical path The optical path setting message including the wavelength information and the path information read from the result database is notified to each node apparatus configuring the reserved optical path path, and each node apparatus configuring the reserved optical path path Wavelength switching setting means for setting wavelength switching of the node device so as to configure the ground optical path based on the wavelength of information;
An optical network design management device comprising: When the optical network management means is provided in each node device, the optical path opening request is made to the optical network management means provided in the start node device of the opening request optical path. ,
The optical network management means includes:
The optical path setting message is sequentially distributed from the start node device provided along with the reserved optical path of the optical path setting message to the end node device, and the optical path setting of the node device constituting the reserved optical path is performed. The optical network design management apparatus according to claim 4, further comprising: When one network management unit is installed for the optical network, when the optical path establishment request is made to the network management unit,
The optical network management means includes:
5. The means for directly delivering the optical path setup message to all the node devices constituting the route of the reserved optical path of the optical path setup message, and setting the optical path of the node device constituting the reserved path. The optical network design management device described. In an optical network system having a mesh configuration composed of node devices that switch optical signals according to wavelength and do not perform wavelength conversion,
An optical network design means, and an optical network management means, comprising an optical network design management device for assigning an optical path based on transmission degradation information and wavelength assignment information in a transmission path or the node device,
The optical network design management device includes:
Optical path reservation means for reserving a preset number of optical paths as reserved optical paths for each ground, which is a combination of a node device that is a starting point of an optical path and a node device that is an end point,
A path / wavelength allocation means for performing a reservation of a path and a wavelength for each reserved optical path;
Output means for storing ground information, wavelength information, and path information in the accommodation design result database for each reserved optical path;
An optical network design means comprising:
For each optical path opening request, a database that searches the reserved design result database for a reserved optical path having the same ground as the opening request optical path, and further searches the resource management information database for usage status information of the reserved optical path Search means;
As a result of the search of the resource management information database, the resource management information database is updated with the usage status information of the optical path requesting optical path of the reserved optical path that is not in use as “used status”, and the accommodation based on the reserved optical path An optical path setting message including wavelength information and path information read from the design result database is notified to each node apparatus constituting the reserved optical path path, and each node apparatus configuring the reserved optical path path is Wavelength switching setting means for setting wavelength switching of the node device so as to constitute the ground optical path based on the wavelength of the wavelength information;
An optical network management means comprising:
An optical network system comprising: When the optical network management means is provided in each node device, the optical path opening request is made to the optical network management means provided in the start node device of the opening request optical path. ,
The optical network management means includes:
The optical path setting message is sequentially distributed from the start node device provided along with the reserved optical path of the optical path setting message to the end node device, and the optical path setting of the node device constituting the reserved optical path is performed. The optical network system according to claim 7, comprising means for performing When one network management unit is installed for the optical network, when the optical path establishment request is made to the network management unit,
The optical network management means includes:
8. The optical path setup message is directly distributed to all node devices constituting the reserved optical path route of the optical path setup message, and includes means for setting an optical path of the node device constituting the reserved path. The optical network system described.

Images