JP2014508429A - Wavelength path control system, wavelength path control method, and wavelength path control program storage medium - Google Patents

Abstract

Wavelength availability is improved without mounting more wavelengths in an optical fiber as network traffic increases.
A wavelength path control system according to an embodiment of the present invention calculates a path for calculating which existing wavelength path needs to be monitored when a new wavelength path setting request or wavelength path construction request is received from a node. Whether to continue or stop the calculation means, the monitoring means for monitoring the signal quality of the existing wavelength path and the new wavelength path that require the monitoring, the setting of the new wavelength path or the construction of the wavelength path, Wavelength path control means for controlling based on the signal quality monitored by the monitoring management means.

Description

  The present invention mainly relates to a wavelength path control system, a wavelength path control method, and a storage medium for storing a wavelength path control program used in a wavelength division multiplexing (WDM) network.

  WDM technology can multiplex optical signals carried by different wavelengths onto a single optical fiber, with each wavelength being treated as an individual path. In order to cope with future network traffic increase or network improvement due to restoration of service provision in the event of network failure, dynamic wavelength path control to set, cancel, or bypass the wavelength path is required. Necessary. In order to dynamically change the wavelength path from one output port to another, reconfiguration function such as wavelength cross connect (WXC) or reconfigurable optical add drop multiplexer (ROADM) is provided. Network elements (NE) can be used.

  However, in the WDM network, the signal quality in the wavelength path deteriorates due to linear distortion or nonlinear distortion. For example, in a plurality of wavelength paths stretched on the same optical fiber, the wavelength paths are mutually affected by nonlinear effects such as four-wave mixing (FWM) and cross phase modulation (XPM). In the wavelength paths whose paths have been changed in the optical node, the wavelength paths are mutually affected by a linear effect such as intra-channel / inter-channel crosstalk generated in the optical switch, the wavelength demultiplexer, and the wavelength multiplexer.

  Usually, the degree of degradation is related to the number of wavelength paths to be multiplexed and the optical power and phase in the wavelength paths. In other words, the dynamic setting / cancellation of wavelength paths and the change in optical characteristics of wavelength paths affect the signal quality of other wavelength paths. If a regenerative repeater that performs optical-electrical-optical (OEO) conversion is used at each node, such an influence can be eliminated, but conversely, the network cost (CAPEX) increases, and all-optical switching is reduced. Transparency, for example transparency about signal formats and protocols, will be lost. In a WDM network that does not have an OEO regenerative relay function, in addition to signal quality of dynamically set wavelength paths, consideration is given to degradation of signal quality of other existing wavelength paths that are affected by the dynamic setting of wavelength paths. There is a need to.

  An example of a technique that considers both the signal quality of a dynamically set wavelength path and the signal quality of a wavelength path that is affected by the dynamic setting is disclosed in Patent Document 1. In that technique, two thresholds are defined to support the decision to continue or stop dynamic configuration. One threshold indicates a signal quality level required for a dynamically set wavelength path. Other thresholds indicate signal quality levels that do not cause errors in the affected wavelength path. An approximated optical signal-to-noise ratio (OSNR) calculation model that takes into account spontaneous emission noise (ASE) in amplification is defined, which model calculates the OSNR for each hop along the newly set wavelength path. Used for. At each hop, the calculated OSNR level is compared to two thresholds. Only when the calculated OSNR is greater than any threshold, new setting of the wavelength path is permitted. With this technique, it is possible to prevent an error from occurring in an existing wavelength path due to a new wavelength path being set.

JP2010-062647

  However, as described above, the signal quality in the wavelength path is degraded by crosstalk, FWM, XPM, and the like. Not considering these deterioration factors leads to overestimation of signal quality. In order to prevent an error from occurring in an existing wavelength path whose signal quality is overestimated, the two threshold values are set sufficiently large in consideration of the effects of deterioration due to crosstalk, FWM, and XPM. If the threshold value is increased, an accurate determination can be guaranteed. However, as a major drawback, the case of rejecting a dynamic wavelength path setting request increases. As a result, the total number of wavelength paths that can be established in the network is limited, and the use efficiency of wavelength resources is reduced. With the rapid increase in Internet traffic, it is desirable to improve the availability of wavelength paths rather than setting more wavelength paths in an optical fiber.

  The present invention has been devised in view of the above situation. An object of the present invention is to provide a wavelength path control system, a wavelength path control method, and a storage medium for storing a wavelength path control program.

  A wavelength path control system according to an embodiment of the present invention includes a path calculation unit that calculates which existing wavelength path needs to be monitored when a new wavelength path setting request or wavelength path construction request is received from a node; Monitoring means for monitoring the signal quality of the existing wavelength path and the new wavelength path that require the monitoring, and whether the setting of the new wavelength path or the construction of the wavelength path is continued or stopped by the monitoring means Wavelength path control means for controlling based on the signal quality.

  The wavelength path control method according to the embodiment of the present invention calculates which existing wavelength path needs to be monitored when a new wavelength path setting request or wavelength path construction request is received from a node, and requires the above. Monitoring the signal quality of the existing wavelength path and the new wavelength path, and controlling whether to continue or stop the setting of the new wavelength path or the construction of the wavelength path based on the monitored signal quality .

  The storage medium storing the wavelength path control program according to the embodiment of the present invention calculates which existing wavelength path needs to be monitored when a new wavelength path setting request or wavelength path construction request is received from a node. Monitor the calculation process, the monitoring process for monitoring the signal quality of the existing wavelength path and the new wavelength path that require the monitoring, and whether to continue or stop the setting of the new wavelength path or the construction of the wavelength path And a control process for controlling based on the signal quality.

  According to the present invention, it is possible to control the wavelength path without causing a potential error in the wavelength path in the network even if the traffic on the network increases.

It is a block diagram which shows the structure of the network apparatus which concerns on 1st embodiment of this invention. It is a flowchart which shows the operation | movement which concerns on 1st embodiment of this invention. It is a block diagram which shows the structure of the optical network which concerns on 2nd embodiment of this invention. It is a block diagram which shows the structure of the node which concerns on 2nd embodiment of this invention. It is a block diagram which shows the structure of the transponder which concerns on 2nd embodiment of this invention. It is a block diagram which shows the structure of the monitoring management part which concerns on 2nd embodiment of this invention. It is a block diagram which shows the structure of the node control part which concerns on 2nd embodiment of this invention. It is a flowchart which shows the operation | movement which concerns on 2nd embodiment of this invention. It is a sequence diagram which shows the operation | movement which concerns on 2nd embodiment of this invention. It is a sequence diagram which shows the operation | movement which concerns on 2nd embodiment of this invention. It is a sequence diagram which shows the operation | movement which concerns on 2nd embodiment of this invention.

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

(First embodiment)
FIG. 1 is a block diagram showing a configuration of a wavelength path control system 1000 according to the first embodiment of the present invention.

  As illustrated in FIG. 1, the wavelength path control system 1000 includes a path calculation unit 1001, a monitoring unit 1002, and a wavelength path control unit 1003.

  FIG. 2 shows the operation of the wavelength path control system 1000. The operation of the wavelength path control system 1000 and the operation of each element included in the wavelength path control system 1000 will be described below.

  First, the path calculation unit 1001 receives a new wavelength path setting request or a wavelength path construction request from a network element not shown in FIG. In step S1001, the path calculation unit 1001 calculates which existing wavelength path needs to be monitored.

  After step S1001, the monitoring unit 1002 monitors the signal quality of the new wavelength path calculated in step S1001 and the existing wavelength path that requires monitoring (step S1002).

  When Step S1002 is started, the wavelength path control unit 1003 controls whether to continue or stop the setting of the new wavelength path or the construction of the wavelength path (Step S1003). The control in step S1003 is executed based on the signal quality monitored in step S1002.

(Excellent effect of the first embodiment)
According to the first embodiment described above, the wavelength path can be controlled without causing degradation of signal quality even when network traffic increases. This is because the monitoring unit 1002 monitors both the new wavelength path calculated by the path calculation unit 1001 and the existing wavelength path that requires monitoring.

(Second embodiment)
FIG. 3 is a block diagram showing the configuration of the optical network according to the second embodiment.

  As shown in FIG. 3, the optical network includes nodes 100 to 105, a network management system (NMS) 300, a monitoring point calculation unit 400, a wavelength path (WP) control unit 500, and a wavelength path database (WP DB) 600.

  The NMS 300 manages the optical network. The monitoring point calculation unit 400 calculates monitoring points on the wavelength path. The WP control unit 500 controls the wavelength path. Details of the nodes 100 to 105 and the above-described units will be described later.

  The nodes 100 to 105 are connected to each other via a bidirectional optical fiber, and optical signals are transmitted bidirectionally through the optical fiber. Optical signals transmitted in the same direction are transmitted using different wavelengths. Each of the nodes 100 to 105 is a network element (NE) type capable of switching a wavelength path.

  The wavelength path in the optical network refers to a wavelength for transmitting an optical signal transmitted from one of the nodes 100 to 105 and received by the other nodes of the nodes 101 to 105. The wavelength path passes through a plurality of nodes 100 to 105 along the optical fiber, but each optical fiber can occupy only a single wavelength. For example, in FIG. 3, the wavelength path WP-A is constructed between the node 100 and the node 105. Normally, the wavelength path is bidirectional, but in FIG. 3, it is described in one direction for ease of explanation. In the path WP-A, the nodes 100, 101, 102, and 105 are routed, and the optical fiber connects the node pair (100, 101), the node pair (101, 102), and the node pair (102, 105). . The wavelength path WP-B is also shown in FIG. In the path WP-B, the nodes 100, 101, 102, and 105 are routed, and the optical fiber connects the node pair (104, 101) and the node pair (101, 102).

  The combination of the nodes 100 to 105 and the optical fiber that play the role of optical signal transmission corresponds to the data plane. On the other hand, the NMS 300, the monitoring point calculation unit 400, the WP control unit 500, and the WP-DB 600 that play a role of wavelength path control, management, and status recording. The combination of these units corresponds to the management / control plane.

  The structure of the node 100 is shown in FIG. Referring to FIG. 4, the node 100 includes an optical amplifier 110, a wavelength demultiplexing / multiplexing (DEMUX / MUX) / switch unit 120, a transponder 130, a monitoring management unit 140, and a node control unit 150. The node 100 is connected to other nodes via the optical fiber 200. The other nodes 101 to 105 have the same structure as the node 100.

  The wavelength path can be switched to a connection from one input-side optical fiber 200 to another output-side optical fiber 200 at the node 100 or can be added / dropped and connected to the transponder 130.

  As shown in FIG. 4, the optical signal is first amplified by the input-side optical amplifier 110 before being processed by the wavelength demultiplexing / switching unit 120 after long-distance transmission along the optical fiber 200. The optical signal is processed by the wavelength DEMUX / MUX / switch unit 120 and then amplified by the output-side optical amplifier 110 in preparation for the next transmission. As the optical amplifier 110, for example, an erbium-doped optical fiber amplifier (EDFA) can be used.

  The optical signal amplified by the input side optical amplifier 110 is first separated into individual wavelengths in the wavelength DEMUX / MUX / switch unit 120. These separated wavelength optical signals can be forwarded to different wavelength ports of different output optical fibers 200 or transponders 130. The optical signal transferred to the optical fiber 200 is multiplexed again by the wavelength DEMUX / MUX / switch unit 120 before being amplified by the output-side optical amplifier 110. The wavelength demultiplexing / multiplexing process can be performed using a passive wavelength device such as an arrayed waveguide grating (AWG).

  The node control unit 150 used to control the optical amplifier 110 and the wavelength DEMUX / MUX / switch unit 120 receives a request from the management / control plane described with reference to FIG. 3, and transmits a response to the management / control plane. . The monitoring manager 140 is used for managing and recording signal quality in different wavelength paths terminated at the node. When the monitoring manager 140 detects that the signal quality is worse than a threshold value indicating that an error may occur, the monitoring manager 140 issues an alarm to the node controller 150, and the node controller 150 An alarm notification is transmitted to the WP control unit 500.

  FIG. 5 shows the structure of the transponder 130. The transponder 130 is used to transmit an optical signal to the wavelength path and receive an optical signal from the wavelength path. Referring to FIG. 5, the transponder 130 includes a WDM transmission unit 131, a WDM reception unit 132, a signal quality monitoring unit 133, a local signal reception unit 134, and a local signal transmission unit 135.

  The WDM signal is received by the WDM receiver 132 and transmitted by the WDM transmitter 131. The input customer signal is received by the local signal receiving unit 134 and transmitted by the local signal transmitting unit 135. Examples of the format of the customer signal include Gigabit Ethernet (registered trademark) (GbE), 10 GbE, STM (Synchronous Transport Module) -4/16/64, OC (Optical Carrier) -12/48/192, and the like.

  The signal quality monitoring unit 133 can evaluate the signal quality by using the number of error correction bits by OSNR (Optical Signal-to-Noise ratio), BER (Bit error rate), FEC (Forward error correction), or the like. . In the second embodiment, a method of counting the number of bits corrected by FEC is used. The monitoring result is transmitted to the monitoring management unit 140. For example, the node control unit 150 can control the WDM signal transmission unit 131 and the reception unit 132 in order to dynamically construct a wavelength path such as adjusting transmission power.

  FIG. 6 shows the structure of the monitoring manager 140. Referring to FIG. 6, the monitoring management unit 140 includes a signal quality database 141 and an alarm determination unit 142. The signal quality database 141 records the signal quality value acquired from the signal quality monitoring unit 133 and periodically updates the record. The alarm determination unit 142 determines whether or not to issue an alarm to the node control unit 150 based on the signal quality database 141.

  The alarm determination unit 142 may use an arbitrary algorithm to determine whether or not to issue an alarm. The algorithm may use a threshold related to signal quality or may use signal reception time. For example, in the alarm determination unit 142, the threshold value X is set, and the calculated value Y is set based on the database 141. When Y> X, the monitoring management unit 140 issues an alarm to the node control unit 150. This alarm means that an error has occurred in the dynamic wavelength path construction procedure. The value Y is calculated by the following equation Y = Bc / Br. In the above equation, Br represents the total number of bits of data received by the transponder 130, and Bc represents the number of bits corrected by FEC within a predetermined period. A large value Y means that transmission conditions on the wavelength path are bad.

  FIG. 7 shows the structure of the node control unit 150. As shown in FIG. 7, the node control unit 150 includes a signal quality alarm control unit 151 and a wavelength management unit 152. When the signal quality alarm control unit 151 receives an alarm from the monitoring management unit 140, the signal quality alarm control unit 151 transmits the notification message to the WP control unit 500.

  The dynamic wavelength path control method will be described below with reference to FIG. 8, FIG. 9, FIG. 10, and FIG. First, FIG. 8 is a flowchart showing a method for processing a dynamic wavelength path construction request.

  In the following description, the wavelength path WP-B is an existing wavelength path, and the wavelength path WP-A is a newly set wavelength path.

  In step S700, the transmission side node issues a dynamic wavelength path construction request. This dynamic wavelength path construction request (hereinafter, “request”) may be a request for requesting establishment of a new wavelength path, or a request for requesting adjustment of transmission power. In the following description, the node 100 is a transmission side node, and the request is a request for requesting establishment of a new wavelength path WP-A.

  The node 100 transmits this request to the NMS 300 and receives a response from the NMS 300. The request includes information on the wavelength path ID, the transmission source node ID, and the transmission destination node ID.

  In step S701, when the NMS 300 receives a request from the node 100, the NMS 300 checks the request type based on the WP DB 600. When the requested wavelength path ID is not included in the WP DB 600, the request is regarded as a new wavelength path setting request. In the case of a request for requesting setting of a new wavelength path, in step S702, the NMS 300 first performs routing and wavelength allocation for the request, and then transfers the route information to the monitoring point calculation unit 400. Arbitrary algorithms can be used for routing and wavelength allocation. As an example of the routing algorithm, there is an OSPF (Open Shortest Path First) algorithm. On the other hand, if the request is not a request for setting a new wavelength path, step S702 is bypassed.

  In step 703, a calculation is made as to which existing wavelength paths are affected by performing the requested dynamic construction. When an existing wavelength path is extended to an optical fiber that has been dynamically constructed in response to a dynamic wavelength path construction request, the existing wavelength path is regarded as an affected wavelength path. The number of affected wavelength paths may be plural. In this calculation, the monitoring point calculation unit 400 extracts wavelength path information from the WP DB 600. In the case of FIG. 3, the existing path WP-B is stretched on the optical fiber (101, 102), and the new path WP-A is also stretched on the optical fiber (101, 102). Corresponds to the affected path.

  After the calculation in step S703 is completed, the monitoring point calculation unit 400 transfers information including the wavelength path ID, transmission source node ID, and transmission destination node ID related to each affected wavelength path to the WP control unit 500.

  In step S704, the WP control unit 500 requests the receiving node of the affected wavelength path and the new wavelength path to start processing to monitor the signal quality of the affected wavelength path and the new wavelength path. Send a request to In the case of FIG. 3, the WP control unit 500 transmits a request to the node 105 that is the receiving side node of WP-A and the node 102 that is the receiving side node of WP-B.

  When the WP control unit 500 confirms that the monitoring management unit 140 of the receiving side nodes 105 and 102 has completed the preparation of the monitoring process (step S705), the transmitting side node 100 starts the dynamic construction process in step S706. To do. In step S706, the transmitting side node 100 transmits the training data bits instead of the actual traffic from the application until notified of the actual traffic transmission. The training data pattern may be arbitrary as long as it does not differ from the actual traffic.

  If an alarm is detected in the affected wavelength path or the new wavelength path while transmitting the training data (step S707), the WP control unit 500 stops the dynamic wavelength path construction. At the same time, in step S708, the WP control unit 500 transmits a failure notification that an error may occur in the existing wavelength path to the transmission side node 100. In step S709, the execution of the monitoring process for the affected wavelength path is stopped. On the other hand, if the alarm is not issued for a certain period, in step S710, the monitoring management unit 140 checks whether or not a satisfactory signal quality is secured with the current configuration. The certain period may be, for example, the time until the wavelength path construction is completed. If satisfactory signal quality is ensured, the transmitting node 100 receives a notification that the dynamic construction has been successful in step S712, and in step S713, execution of the monitoring process for the affected wavelength path is stopped. Is done. On the other hand, if satisfactory signal quality is not ensured, dynamic construction is continued in step S711. Only when the sending node 100 receives a notification that the dynamic construction has been successful, in step S714, actual traffic from the application is transmitted along the wavelength path.

  FIG. 9 is a sequence diagram of signaling used to start the multipoint monitoring process when a dynamic wavelength path construction request is issued. In step S <b> 700, the transmission side node 100 transmits a dynamic wavelength path establishment request message 800 to the NMS 300. Then, after steps S701 and S702 illustrated in FIG. 8 are completed, the NMS 300 transmits a request message 801 to the monitoring point calculation unit 400. When setting a new wavelength path, the request message 801 includes ID information and route information of the new wavelength path. In the case of dynamically adjusting the optical parameter such as the transmission output power as an example, only the wavelength path ID is included in the request.

  In step S703, after the calculation of the affected wavelength path is completed, the monitoring point calculation unit 400 transmits a message 802 to the WP control unit 500. The message 802 includes a list of wavelength paths identified and affected by the wavelength path ID, source node ID, and destination node ID.

  For each wavelength path that is affected and listed in the list, the WP control unit 500 transmits a message 803 to the node control unit 150 of the transmission source node and the transmission destination node of the affected wavelength path. Message 803 is sent after step 704 is completed. The message 803 includes wavelength path ID information and node ID information.

  Then, the node control unit 150 transmits a request message 804 to the monitoring management unit 140 and requests to start the signal quality monitoring process. When the monitoring manager 140 is ready for the investigation process, the monitoring manager 140 returns a response message 805 to the node controller 150.

  The message 806 is returned to the WP control unit 500 by the node control unit 150. The message 806 includes information indicating that the preparation of the monitoring management unit 140 is completed and an ID of the WP control unit 500 such as an IP (Internet Protocol) address.

  When the WP control 500 receives the message 806 from all affected wavelength paths, the WP control unit 500 directly notifies the NMS 300 using the message 807 that the transmitting side node can start the dynamic construction procedure. To do. The message 807 indicates the ID information of the NMS 300 such as the IP address, the wavelength path ID information, and the status that all the monitoring managers 140 are ready to monitor the signal quality variation when building the dynamic wavelength path Contains information about.

  When the sending node 100 receives the message 808 from the NMS 300, it starts dynamic construction. The message 808 includes wavelength path ID information, transmission source node ID information, transmission destination node ID information, and information regarding a state indicating that the transmission side node 100 is permitted to start the dynamic construction procedure.

  FIG. 10 shows the signal sequence when dynamic wavelength path construction causes a potential error for the affected wavelength path. That is, the sequence shown in FIG. 10 corresponds to steps S707 (yes) to S709 in FIG.

  When a condition set in the monitoring management unit (for example, Y is greater than X) is satisfied as a result of calculation by the monitoring management unit 140, the monitoring unit 140 notifies that there is a risk of an error occurring. In addition, a warning message 809 is issued to the node control unit 150. Then, the node control unit 150 notifies the WP control unit 500 using the message 810 that an error has occurred during the construction of the dynamic wavelength path. The message 810 includes an error code indicating an error type and an ID of the WP control unit 500 such as an IP address.

  Since the WP control unit 500 receives the error message 810, the WP control unit 500 uses the message 811 to end the signal quality variation investigation process for the node control units 150 related to all affected wavelength paths. Notice. The message 811 includes wavelength path ID information, transmission source ID information, and transmission destination ID information for each affected wavelength path. When receiving the message 811, the node control unit 150 requests the monitoring management unit 140 to end the monitoring process using the message 812.

  At the same time, the WP control unit 500 also sends a message 813 to the NMS 300 to notify that an error has occurred during execution of the dynamic construction procedure. The message 813 includes ID information of the NMS 300 such as an IP address, wavelength path ID information, and information regarding an error code indicating a failure due to the occurrence of an error in the affected wavelength path.

  Then, the NMS 300 transmits a message 814 for notifying that the dynamic construction process is to be stopped. The message 814 includes wavelength path ID information, transmission source node ID information, transmission destination node ID information, and information regarding an error code indicating a failure due to the occurrence of an error in the affected wavelength path.

  Finally, FIG. 11 shows a signaling sequence when dynamic wavelength path construction is successful. That is, the sequence shown in FIG. 11 corresponds to steps S710 (yes) to S714.

  After steps S710 to S713 are executed, the WP control unit 500 transmits a message 815 to the node control unit 150 in order to stop the signal quality monitoring process. The WP control unit 500 further transmits a message 816 to the NMS 300 to notify the success of dynamic construction.

  The NMS 300 also transmits a message 817 for notifying that preparation for dynamic construction has been completed. Then, the transmission side node 100 starts transmission of actual traffic from the application.

(Advantageous effects of the second embodiment)
According to the second embodiment described above, the wavelength path can be controlled without degrading the signal quality even if the traffic of the optical network increases. Also, the wavelength resource utilization efficiency is improved. This is because the signal quality of both the new wavelength path and the existing path is monitored.

  Furthermore, according to the second embodiment, not only setting of a new wavelength path but also dynamic path construction can be processed. This is because the signal quality of both the new wavelength path and the existing path is monitored.

  Although the invention has been shown and described with reference to embodiments thereof, the invention is not limited to these embodiments. It will be appreciated by those skilled in the art that various changes can be made in form and detail without departing from the spirit and scope of the invention as defined by the claims.

  For example, the operations (the operations shown in the flowcharts and sequence charts) in each of the above-described embodiments can be executed by hardware, software, or a configuration in which hardware and software are combined.

  When processing by software is performed, it is also possible to mount a program recording a processing sequence on a computer mounted on dedicated hardware and execute the program. It is also possible to install this program on a general-purpose computer capable of executing various processes.

  For example, this program can be recorded in advance on a hard disk and a ROM (Read Only Memory) as storage media. In addition, the program can be temporarily or permanently stored in a removable storage medium such as a CD-ROM (Compact Disc Read Only Memory), MO (Magneto optical) disk, DVD (Digital Versatile Disc), magnetic disk, or semiconductor memory. It is also possible to save (record) the file. Such a removable storage medium can be provided as so-called package software.

  In addition, as described above, this program can be read and installed from a removable storage medium. Alternatively, this program can be transferred from a download site to a computer wirelessly. . It is also possible to transfer this program by wired communication via a network such as a LAN (Local Area Network) and the Internet. The computer can receive the transferred program and install it on a storage medium such as a built-in hard disk.

  Further, the system described in the above-described embodiment may have a structure in which a plurality of devices are logically combined, and a configuration in which the functions of the devices are mixed.

  All or part of the above-described embodiments can be described as the following supplementary notes, but is not limited to the following supplementary notes.

(Appendix 1)
A path calculation means for calculating which existing wavelength path needs to be monitored when a new wavelength path setting request or wavelength path construction request is received from a node;
Monitoring means for monitoring the signal quality of the existing wavelength path and the new wavelength path that require the monitoring;
A wavelength path control system comprising: a wavelength path control unit that controls whether the setting of the new wavelength path or the construction of the wavelength path is continued or stopped based on the signal quality monitored by the monitoring management unit. .

(Appendix 2)
The existing wavelength path that needs to be monitored is an affected existing wavelength path that is affected by the setting of the new wavelength path or the construction of the wavelength path.
The wavelength path control system according to attachment 1.

(Appendix 3)
The monitoring means for monitoring the signal quality of the existing wavelength path and the new wavelength path at a receiving node;
The wavelength path control system according to appendix 1 or 2.

(Appendix 4)
Including the monitoring means for issuing a warning to the wavelength path control means when the monitoring means detects a deterioration in signal quality;
The wavelength path control system according to any one of appendices 1 to 3.

(Appendix 5)
The monitoring means for detecting signal quality degradation when the ratio of the number of bits corrected in a predetermined period to the total number of data bits received in the predetermined period is greater than a threshold;
The wavelength path control system according to any one of appendices 1 to 4.

(Appendix 6)
The monitoring means for detecting that the ratio of the number of bits corrected in a predetermined period to the total number of data bits received in the predetermined period is less than or equal to the threshold value;
The wavelength path control system according to any one of appendices 1 to 5.

(Appendix 7)
The bit correction is performed using FEC (Forward Error Correction).
The wavelength path control system according to appendix 5 or 6.

(Appendix 8)
When a new wavelength path setting request or wavelength path construction request is received from a node, calculate which existing wavelength path needs to be monitored,
Monitoring the signal quality of the existing wavelength path and the new wavelength path that require the monitoring;
Controlling whether to continue or stop the setting of the new wavelength path or the construction of the wavelength path based on the monitored signal quality;
Wavelength path control method.

(Appendix 9)
The existing wavelength path that requires monitoring further corresponds to an affected existing wavelength path that is affected by the setting of the new wavelength path or the construction of the wavelength path.
The wavelength path control method according to appendix 8.

(Appendix 10)
Further, the signal quality is monitored at a receiving side node related to the existing wavelength path and the new wavelength path.
The wavelength path control method according to appendix 8 or 9.

(Appendix 11)
Furthermore, a warning is issued when the monitoring unit detects a deterioration in signal quality.
The wavelength path control method according to any one of appendices 8 to 10.

(Appendix 12)
Further, signal quality degradation is detected when the ratio of the number of bits corrected in a predetermined period to the total number of data bits received in the predetermined period is greater than a threshold value.
The wavelength path control method according to any one of appendices 8 to 11.

(Appendix 13)
And detecting that the ratio of the number of bits corrected in the predetermined period to the total number of data bits received in the predetermined period is less than or equal to the threshold.
The wavelength path control method according to any one of appendices 8 to 12.

(Appendix 14)
The bit correction is performed using FEC (Forward Error Correction).
The wavelength path control method described in appendix 12 or 13.

(Appendix 15)
Calculation processing to calculate which existing wavelength path needs to be monitored when a new wavelength path setting request or wavelength path construction request is received from a node;
A monitoring process for monitoring the signal quality of the existing wavelength path and the new wavelength path that require the monitoring;
Control processing for controlling whether to continue or stop the setting of the new wavelength path or the construction of the wavelength path based on the monitored signal quality,
A storage medium for storing a wavelength path control program.

(Appendix 16)
The existing wavelength path that needs to be monitored is an affected existing wavelength path that is affected by the setting of the new wavelength path or the construction of the wavelength path.
A storage medium for storing the wavelength path control program described in Appendix 15.

(Appendix 17)
Furthermore, a monitoring process for monitoring the signal quality at the receiving side node related to the existing wavelength path and the new wavelength path,
A storage medium for storing the wavelength path control program described in Supplementary Note 15 or 16.

(Appendix 18)
Further, it includes a transmission process for issuing a warning when the monitoring unit detects a deterioration in signal quality.
A storage medium for storing the wavelength path control program according to any one of supplementary notes 15 to 17.

(Appendix 19)
A detection process for detecting signal quality degradation when the ratio of the number of bits corrected in the predetermined period to the total number of data bits received in the predetermined period is greater than a threshold;
A storage medium for storing the wavelength path control program according to any one of Supplementary Notes 15 to 18.

(Appendix 20)
And a detection process for detecting that a ratio of the number of bits corrected in the predetermined period to the total number of data bits received in the predetermined period is equal to or less than the threshold.
A storage medium for storing the wavelength path control program according to any one of Supplementary Notes 15 to 19.

(Appendix 21)
The bit correction is performed using FEC (Forward Error Correction).
A storage medium for storing the wavelength path control procedure described in appendix 19 or 20.

(Appendix 22)
Calculation processing to calculate which existing wavelength path needs to be monitored when a new wavelength path setting request or wavelength path construction request is received from a node;
A monitoring process for monitoring the signal quality of the existing wavelength path and the new wavelength path that require the monitoring;
A control process for controlling whether to continue or stop the setting of the new wavelength path or the construction of the wavelength path based on the monitored signal quality,
Wavelength path control program.

(Appendix 23)
The existing wavelength path that needs to be monitored is an affected existing wavelength path that is affected by the setting of the new wavelength path or the construction of the wavelength path.
The wavelength path control program described in appendix 22.

(Appendix 24)
Further comprising a monitoring process for monitoring the signal quality at a receiving side node related to the existing wavelength path and the new wavelength path,
The wavelength path control program described in appendix 22 or 23.

(Appendix 25)
Further includes a sending process for issuing a warning when the monitoring unit detects signal quality degradation;
The wavelength path control program described in any one of appendices 22 to 24.

(Appendix 26)
And a detection process for detecting signal quality degradation when the ratio of the number of bits corrected in the predetermined period to the total number of data bits received in the predetermined period is greater than the threshold.
The wavelength path control program described in any one of Supplementary Notes 22 to 25.

(Appendix 27)
Including a detection process for detecting that a ratio of the number of bits corrected in a predetermined period to a total number of data bits received in the predetermined period is equal to or less than the threshold.
27. The wavelength path control procedure described in any one of appendices 22 to 26.

(Appendix 28)
The bit correction is performed using FEC (Forward Error Correction).
The wavelength path control program according to appendix 26 or 27.

DESCRIPTION OF SYMBOLS 100 Node 110 Optical amplifier 120 Wavelength DEMUX / MUX and switch part 130 Transponder 131 WDM transmission part 132 WDM reception part 133 Signal quality monitoring part 134 Local signal receiving part 135 Local signal transmission part 140 Monitoring management part 141 Signal quality database 142 Warning judgment part 150 Node control unit 151 Signal quality warning control unit 152 Wavelength management unit 200 Optical fiber 300 NMS
400 Monitoring point calculation unit 500, 1003 Wavelength path (WP) control unit 600 Wavelength path database (WPDB)
800, 801, 802, 803, 804, 805, 806, 807, 808, 809, 810, 811, 812, 813, 814, 815, 816, 817 Message 1000 Wavelength path control system 1001 Path calculation unit 1002 Monitoring unit

Claims (21)

A path calculation means for calculating which existing wavelength path needs to be monitored when a new wavelength path setting request or wavelength path construction request is received from a node;
Monitoring means for monitoring the signal quality of the existing wavelength path and the new wavelength path that require the monitoring;
A wavelength path control system comprising wavelength path control means for controlling whether to continue or stop the setting of the new wavelength path or the construction of the wavelength path based on the signal quality monitored by the monitoring management unit. . The existing wavelength path that needs to be monitored is an affected existing wavelength path that is affected by the setting of the new wavelength path or the construction of the wavelength path.
The wavelength path control system according to claim 1. The monitoring means for monitoring the signal quality of the existing wavelength path and the new wavelength path at a receiving node;
The wavelength path control system according to claim 1 or 2. Including the monitoring means for issuing a warning to the wavelength path control unit when the monitoring unit detects signal quality degradation;
The wavelength path control system according to any one of claims 1 to 3. The monitoring means for detecting signal quality degradation when the ratio of the number of bits corrected in a predetermined period to the total number of data bits received in the predetermined period is greater than a threshold;
The wavelength path control system according to any one of claims 1 to 4. The monitoring means for detecting that the ratio of the number of bits corrected in a predetermined period to the total number of data bits received in the predetermined period is less than or equal to the threshold value;
The wavelength path control system according to any one of claims 1 to 5. The bit correction is performed using FEC (Forward Error Correction).
The wavelength path control system according to claim 5 or 6. When a new wavelength path setting request or wavelength path construction request is received from a node, calculate which existing wavelength path needs to be monitored,
Monitoring the signal quality of the existing wavelength path and the new wavelength path that require the monitoring;
Controlling whether to continue or stop the setting of the new wavelength path or the construction of the wavelength path based on the monitored signal quality;
Wavelength path control method. The existing wavelength path that requires monitoring further corresponds to an existing wavelength path that is affected by the setting of the new wavelength path or the construction of the wavelength path.
The wavelength path control method according to claim 8. Further, the signal quality is monitored at a receiving side node related to the existing wavelength path and the new wavelength path.
The wavelength path control method according to claim 8 or 9. Furthermore, a warning is issued when the monitoring unit detects a deterioration in signal quality.
The wavelength path control method according to any one of claims 8 to 10. Further, signal quality degradation is detected when the ratio of the number of bits corrected in a predetermined period to the total number of data bits received in the predetermined period is greater than a threshold value.
The wavelength path control method according to any one of claims 8 to 11. And detecting that the ratio of the number of bits corrected in the predetermined period to the total number of data bits received in the predetermined period is less than or equal to the threshold.
The wavelength path control method according to any one of claims 8 to 12. The bit correction is performed using FEC (Forward Error Correction).
The wavelength path control method according to claim 12 or 13. Calculation processing to calculate which existing wavelength path needs to be monitored when a new wavelength path setting request or wavelength path construction request is received from a node;
A monitoring process for monitoring the signal quality of the existing wavelength path and the new wavelength path that require the monitoring;
Control processing for controlling whether to continue or stop the setting of the new wavelength path or the construction of the wavelength path based on the monitored signal quality,
A storage medium for storing a wavelength path control program. The existing wavelength path that needs to be monitored corresponds to an affected existing wavelength path that is affected by the setting of the new wavelength path or the construction of the wavelength path.
A storage medium for storing the wavelength path control program according to claim 15. Furthermore, a monitoring process for monitoring the signal quality at the receiving side node related to the existing wavelength path and the new wavelength path,
A storage medium for storing the wavelength path control program according to claim 15 or 16. Further, it includes a transmission process for issuing a warning when the monitoring unit detects a deterioration in signal quality.
A storage medium for storing the wavelength path control program according to any one of claims 15 to 17. And a detection process for detecting signal quality degradation when the ratio of the number of bits corrected in the predetermined period to the total number of data bits received in the predetermined period is greater than a threshold.
A storage medium for storing the wavelength path control program according to any one of claims 15 to 18. And a detection process for detecting that a ratio of the number of bits corrected in the predetermined period to the total number of data bits received in the predetermined period is equal to or less than the threshold.
A storage medium for storing the wavelength path control program according to any one of claims 15 to 19. The bit correction is performed using FEC (Forward Error Correction).
A storage medium for storing the wavelength path control program according to claim 19 or 20.

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