WO2012065491A1

WO2012065491A1 - Method for protection switching in complicated optical network and network management system

Info

Publication number: WO2012065491A1
Application number: PCT/CN2011/081053
Authority: WO
Inventors: 石丽丽
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-11-16
Filing date: 2011-10-20
Publication date: 2012-05-24
Also published as: CN101984566A

Abstract

The present invention relates to a method for protection switching in a complicated optical network and a network management system. The network management system can be used to acquire the data of the entire network. When a service path has failed, an optimal protection path can be provided to a user to perform protection switching according to preset factors such as the load occupancy rate of each line in the entire network, line aging degree, alarm occurring frequency, signal to noise ratio and so forth, which is advantageous for network optimization and for relieving pressure on the hardware system and the automatic protection switching (APS) bus.

Description

TECHNICAL FIELD The present invention relates to the field of communications technologies, and in particular, to a method and a network management system for complex optical network protection switching. BACKGROUND OF THE INVENTION The rapid development of optical network technologies enables optical transport networks to carry more types and services of more capacity. With the rapid increase in the amount of business data, the survivability of the network, that is, the ability of the network to maintain service continuity in the event of a failure, is directly related to the security of the network service data. This requires the system to provide a powerful automatic protection switching (APS) function. Currently, typical APS includes 1+1 protection, 1:N protection, and ring sharing protection.

A protection group usually refers to a set of hardware set to protect a certain resource (a wavelength channel or a multiplex section, etc.), usually including an APS detector board, an APS controller board, an APS actuator board, etc. . Currently, the protection switching of the protection group is mainly performed by the above-mentioned boards of the NEs in the protection group.

As the complexity of the system configuration increases, when a large number of service boards are configured in the system, the corresponding service boards report all APS alarms at the same time due to line faults. This causes a large pressure on the system APS bus, resulting in the system APS bus. The efficiency and reliability are reduced.

In addition, for a network with a large number of protection nodes (protection nodes are one or a pair of boards that can perform protection switching), a simple example is shown in Figure 1. The non-protected nodes in the path are omitted, if the network includes N Protection node, each protection node is 1:1 protection type. If the path through the protection port is a protection path, the protection path has 2N-1 possibilities, and the optimal path should integrate the load occupancy rate and line of each line. Degree of fiber aging, frequency of alarms on the line The rate and the signal-to-noise ratio of the optical channel are selected. However, the APS controller that the technology relies on can only obtain the alarm information of the local network element, and cannot obtain the entire network data. Therefore, the protection path selected for switching is usually not the most. Good. Summary of the invention

The main purpose of the present invention is to provide a method for the protection switching of a complex optical network and a network management system. When the service path fails, the optimal protection path is selected and provided to the user for reference without affecting the protection switching time. Perform protection switching.

The technical solution adopted by the present invention to solve the technical problem thereof is:

A method for protecting a complex optical network protection, the method comprising:

The network management system searches all paths of the entire network, and obtains the load occupancy rate of the optical link of each multiplex section of the path, the aging degree of each optical transmission layer line, the port and frequency of each optical signal-to-noise ratio and protection switching related alarm;

Determining the faulty service path according to the port where the alarm occurs, and obtaining all optional protection paths of the faulty service path according to the protection relationship;

Sorting the optional protection paths according to the preset load occupancy ratio of each multiplex section fiber link, the aging degree of each optical transmission layer line, the optical signal-to-noise ratio or/and the frequency of protection switching related alarms, and selecting The best path for the user's reference;

The protection switching is performed according to the user's selection of the best path.

Preferably, the protection switching is performed according to the user's selection of the optimal path, if the network management system automatically performs protection switching, the network management system determines that the failed service path and the optimal protection path are not The configuration command is sent to the start and end points of the coincidence part, and the configuration command is sent to the board to perform protection switching. If the protection switching is not performed in advance, the network management system receives the protection switching related alarm. After that, the protection is switched by hardware.

Preferably, the load occupancy rate and each light of each multiplex section fiber link according to a preset setting The aging degree of the transmission layer line, the optical signal-to-noise ratio, and/or the frequency of the protection switching related alarms are sorted by the optional protection path, and the best path is selected for the user's reference.

Calculating the maximum value of the load occupancy of each multiplex section of each optional protection path, the maximum value of the aging degree of each transmission layer, the maximum value of each alarm occurrence frequency, and the signal-to-noise ratio of the channel corresponding to each optional protection path ;

According to pre-set factors, the maximum value of the load occupancy rate of each multiplex section, the maximum value of the line aging degree, and the maximum value of the alarm occurrence frequency are all sorted in descending order, the signal-to-noise ratio is sorted in ascending order, and weighted, calculated a weighted sum of the various optional protection paths in various sorting modes;

Determine the weighted and largest protection path as the best path.

Preferably, the network management system determines a configuration command that needs to be delivered, where the faulty service path and the start and end points of the non-coincident part of the all-inclusive protection path are required to be delivered, and specifically includes:

The part of the current faulty service path that is not coincident with the selected best protection path is found. If the unsuccessful part of the originating board is a reconfigurable optical add/drop multiplexer ROADM board, it needs to be sent to the ROADM board. A wavelength assignment command on the ROADM board: Reassign the currently faulty service path wavelength from the corresponding port of the working path to the corresponding port of the protection path; or

If the unsuccessful part of the originating board is a sub-rate multiplexer (TMUX) board, a cross-configuration command is sent to the TMUX board: the current crossbar switch is switched to the intersection of the selected best protection path; or

If the unsuccessful part of the board is a photo-protected board, it needs to be sent to the relevant board.

APS Actuator A forced protection switching command: Switch the protection switch to the port of the selected best protection path.

The present invention also provides a network management system, the system comprising: a parameter acquisition unit, a protection path acquisition unit, an optimal path selection unit, and a protection switching unit;

The parameter obtaining unit is configured to search all paths of the entire network, and obtain the multiplex section lights of the path. The load occupancy rate of the fiber link, the aging degree of each optical transmission layer line, the port and frequency at which each optical signal-to-noise ratio and protection switching related alarm occurs;

The protection path obtaining unit is configured to determine, according to the port where the alarm occurs, a faulty service path, and obtain all optional protection paths of the faulty service path according to the protection relationship;

The optimal path selection unit is configured to: according to a preset load occupancy rate of each multiplex section fiber link, an aging degree of each optical transmission layer line, each optical signal to noise ratio, and/or a frequency of protection switching related alarm occurrence Perform the sorting of the optional protection paths, and select the best path for the user to refer to;

The protection switching unit is configured to perform protection switching according to a user selection of the optimal path.

Preferably, the protection switching unit is further configured to: if the protection switching is automatically performed by the network management system, the network management system determines that the failed service path and the starting point and the end point of the non-coincident part of the optimal protection path are required to be After the configuration command is sent, the configuration command is sent to the board to perform protection switching. If the protection switching is not performed in advance, the protection switching is performed by the hardware after the network management system receives the protection switching related alarm.

Preferably, the optimal path selection unit further includes:

The parameter calculation sub-unit is configured to calculate a maximum value of the load occupancy rate of each multiplex section of each optional protection path, a maximum value of the aging degree of each transmission layer line, a maximum value of each alarm occurrence frequency, and each optional protection path Corresponding channel signal to noise ratio;

a sorting weighting subunit, configured to sort the maximum value of the load occupancy rate, the maximum value of the line aging degree, and the maximum value of the alarm occurrence frequency in descending order according to a preset factor, and the signal to noise ratio is in ascending order. Sorting, and performing weighting, calculating a weighted sum of the various optional protection paths in various sorting manners;

The best path determination subunit is used to determine the weighted sum and the largest protection path is the best path. Preferably, the protection switching unit is further configured to find a service path that is currently faulty. The portion of the selected best protection path that does not coincide;

If the originating board of the best protection path of the non-coincident part is a ROADM board, you need to send a wavelength assignment command to the ROADM board: Redirect the currently faulty service path wavelength from the corresponding port of the working path. Is assigned to the corresponding port of the protection path; or,

If the non-coincident part of the egress board is a TMUX board, then a cross configuration command is sent to the TMUX board: the current crossbar switch is switched to the intersection of the selected best protection path; or

If the non-coincident part of the board is an OP-type board, you need to send a forced protection switching command to the relevant APS actuator: Switch the protection switch to the port of the selected best protection path.

The technical solution of the present invention has the following beneficial effects: The method for the complex optical network protection switching and the network management system provided by the present invention can obtain the advantages of the whole network data by using the network management system, and when the service path fails, according to the user's concern The load occupancy rate, line aging degree, alarm frequency, signal-to-noise ratio and other factors of each line of the network provide the user with a best protection path for him to perform protection switching, which is beneficial to network optimization and reduces the hardware system and The pressure of the APS bus. DRAWINGS

FIG. 1 is a flowchart of a method according to an embodiment of the present invention;

Figure 2 is a flow chart of step S130 of Figure 1;

3 is a schematic diagram of a network system according to an embodiment of the present invention;

4 is a schematic diagram of a current faulty service path and an optimal protection path of a network management system according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a network management system according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of an optimal path selection unit according to an embodiment of the present invention. detailed description

The implementation, functional features and advantages of the objects of the present invention will be further described in conjunction with the embodiments herein.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment of the invention provides a method for protecting a complex optical network protection switching. As shown in FIG. 1 , the method includes the following steps:

S110. The network management system searches all the paths of the entire network, and obtains the load occupancy rate of the optical links of each multiplex section of the path, the aging degree of each optical transmission layer line, the optical SNR, and the port and frequency of the alarm related to the protection switching.

In this embodiment, the paths of the same-same-same-slots are mutually protected. The load-carrying rate of the optical links of the multiplex sections of the path is usually the number of actual services carried by the links between the two optical amplifier boards. The ratio of the bandwidth of the multiplex section; the network management system collects the input optical power and the output optical power data of each optical transmission layer line, and calculates the aging degree of the line compared with the factory attenuation of the line; and receives the alarm related to the protection switching in the network management system. The network element, board, port, and time information of the alarm are recorded, and the frequency of occurrence of the alarm is calculated.

S120. Determine, according to the port where the alarm occurs, a service path that is faulty, and obtain all optional protection paths of the faulty service path according to the protection relationship.

In this embodiment, the protection relationship is a relationship between a protection path and a service path, that is, a protection path related to the service path.

S130. Perform an order of the optional protection paths according to a preset load ratio of the multiplex section fiber link, the aging degree of each optical layer, the optical SNR, and/or the frequency of the protection switching related alarm. Choose the best path for your reference.

The pre-setting can be based on the load occupancy, the degree of aging, and the signal-to-noise ratio for the above And the degree of interest of the factors such as the frequency of occurrence is set in advance, and the factor of interest may be any one, or may be any combination. In this embodiment, more specifically, as shown in FIG. 2, the step S130 include:

5131. Calculate a maximum value of the load occupancy rate of each multiplex section of each optional protection path, a maximum value of the aging degree of each transmission layer, a maximum value of each alarm occurrence frequency, and a letter of the channel corresponding to each optional protection path. Noise ratio.

5132. According to a pre-set factor (such as: may be customized according to factors that the user cares about, or may be automatically set by the system), the maximum value of the load occupancy rate of each multiplex section, the maximum value of the line aging degree, The maximum value of the alarm occurrence frequency is sorted in descending order, the signal-to-noise ratio is sorted in ascending order, and weighted, and the weighted sum of the various optional protection paths in various sorting modes is calculated.

5133. Determine the weighting and the largest protection path as the best path.

S140. Perform protection switching according to a user selection of the optimal path.

In this embodiment, more specifically, the step S140 includes: if the preset is set in advance (which can be customized for the user, or can be automatically set by the system), the network management system automatically performs protection switching, and the network management system determines that the occurrence occurs. The configuration of the faulty service path and the start and end points of the non-coincident part of the best protection path, such as the wavelength assignment, the cross-configuration, and the mandatory protection switching configuration command, are sent to the board. Protection switching.

In this embodiment, the configuration command is transmitted to the board by using multicast signaling, and the protection switching time is less than 50 ms of the operation requirement. If the network management system is not configured to perform protection switching automatically, the network management system is After receiving the protection switching related alarm through the APS bus, the hardware performs protection switching.

The method provided in this embodiment analyzes the data of the entire network by the network management system, and uniformly delivers the protection switching command. The board does not need to judge and transmit signaling, which not only facilitates network optimization, but also reduces the pressure on the hardware system and the APS bus. In this embodiment, more specifically, taking the service shown in FIG. 3 as an example, the currently faulty service path and the selected optimal protection path are as shown in FIG. 4, wherein, in FIG. 3, except for the protection node 1 Between the protection node 2 and the protection path, the service path and the protection path coincide. In the step S140, the network management system determines the configuration command that needs to be delivered, and the configuration command that needs to be delivered at the start and end points of the non-coincident part of the best protection path, which includes:

Find out the part of the current fault that does not coincide with the selected best protection path, that is, the AB section (service path) and the CD section (protection path) between the protection node 1 and the protection node.

If the unsuccessful part of the board is a reconfigurable optical add-drop multiplexer (ROADM) board, you need to send a wavelength assignment command to the board: The service path wavelength is reassigned from the corresponding port of the working path to the protection path port; or

If the unsuccessful part of the board is a Trans-Multiplexer (TMUX) board, you need to send a cross-configuration command to the associated clock cross-connect (CSU) board: Switch the current cross-switch to protection. Cross on the road; or

If the unsuccessful part of the board is a photo-protection (OP) board, you need to send a forced protection switching command to the relevant APS actuator: Switch the protection switch to the port of the protection section.

In addition, the process of processing at the receiving end for the above three cases is also the same.

The embodiment of the present invention further provides a network management system, which is used to implement the method provided in the foregoing embodiment. As shown in FIG. 5, the network management system includes:

The parameter obtaining unit 510 is configured to search all the paths of the entire network, obtain the load occupancy rate of the optical links of each multiplex section of the path, the aging degree of each optical transmission layer line, the optical SNR, and the port for the protection switching related alarm occurrence. And frequency.

The protection path obtaining unit 520 is configured to determine, according to the port where the alarm occurs, a faulty service path, and obtain all optional protection paths of the faulty service path according to the protection relationship. The optimal path selection unit 530 is configured to perform, according to the preset load occupancy rate of each multiplex section fiber link, the aging degree of each optical transmission layer line, the optical signal to noise ratio, and/or the frequency of the protection switching related alarm occurrence. The sorting of optional protection paths, select the best path for the user's reference.

The protection switching unit 540 is configured to perform protection switching according to the user's selection of the optimal path.

In this embodiment, the protection switching unit 540 is further configured to: if the network management system is automatically configured to perform protection switching, the network management system determines the faulty service path and the optimal protection. The configuration command is sent to the board at the start and end of the non-coincident part. The configuration command is sent to the board to perform protection switching. If the network management system does not set the protection switching automatically, the protection switching is received in the network management system. After the related alarms, the protection switching is performed by hardware.

In addition, in a more specific embodiment, the protection switching unit 540 is further configured to find a part of the current faulty service path that does not coincide with the selected best protection path;

In this embodiment, more specifically, the optimal path selecting unit 530, as shown in FIG. 6, further includes:

The parameter calculation subunit 531 is configured to calculate the load occupation of each multiplex section of each optional protection path. The maximum value of the rate, the maximum value of the aging degree of each transmission layer, the maximum value of each alarm occurrence frequency, and the signal-to-noise ratio of the channel corresponding to each optional protection path.

The sorting weighting subunit 532 is configured to sort the maximum value of the load occupancy rate, the maximum value of the line aging degree, and the maximum value of the alarm occurrence frequency in descending order according to a preset factor, and the signal to noise ratio is Sorting in ascending order, and weighting, calculating the weighted sum of the various optional protection paths in various sorting modes.

The optimal path determining sub-unit 533 is configured to determine the weighted sum and the largest protection path as the optimal path.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, and improvements made within the spirit and scope of the present invention should be included in the scope of the present invention. Inside.

Claims

Claim

A method for protecting a complex optical network protection switching, the method comprising: the network management system searching all the paths of the entire network, obtaining the load occupancy rate of the optical links of each multiplex section of the path, and aging of the optical transmission layer lines The port and frequency at which the degree, the optical signal-to-noise ratio, and the protection switching related alarm occur;

Sorting the optional protection paths according to the preset load occupancy ratio of each multiplex section fiber link, the aging degree of each optical transmission layer line, the optical signal-to-noise ratio, and/or the frequency of protection switching related alarms. The best path for the user's reference;

2. The method according to claim 1, wherein the protection is switched according to a user selection of the optimal path,

If the network management system is configured to automatically perform the protection switching, the network management system determines the configuration command that needs to be delivered, and sends the configuration command to the faulty service path and the starting point and the end point of the non-coincident part of the optimal protection path. The board performs protection switching.

If the protection switching is automatically performed in the network management system, the protection switching is performed by the hardware after the network management system receives the protection switching related alarm.

The method according to claim 2, wherein the load occupancy rate of each multiplex section fiber link according to a preset, the aging degree of each optical transmission layer line, each optical signal to noise ratio, and/or protection The frequency of the relevant alarms is reversed to sort the optional protection paths, and the best path is selected for the user to refer to.

Calculate the maximum value of the load occupancy of each multiplex section of each optional protection path, the maximum value of the aging degree of each transmission layer, the maximum value of each alarm occurrence frequency, and each optional protection path. The signal to noise ratio of the corresponding channel;

According to pre-set factors, the maximum value of the load occupancy rate of each multiplex section, the maximum value of the line aging degree, and the maximum value of the alarm occurrence frequency are all sorted in descending order, the signal-to-noise ratio is sorted in ascending order, and weighted, calculated Weighted sum of the various optional protection paths in various sorting modes^

Determine the weighted and largest protection path as the best path.

The method according to claim 2, wherein the network management system determines that the configuration command to be delivered is required to be sent by the service path of the failure and the start and end points of the non-coincident part of the all-inclusive protection path.

If the unsuccessful part of the board is a photo-protected OP board, you need to send a forced protection switching command to the relevant APS actuator: Switch the protection switch to the port of the selected best protection path.

A network management system, the system comprising: a parameter acquisition unit, a protection path acquisition unit, an optimal path selection unit, and a protection switching unit;

The parameter obtaining unit is configured to search all the paths of the entire network, obtain the load occupancy rate of the optical link of each multiplex section of the path, the aging degree of each optical transmission layer line, the optical SNR and the protection switching related alarm Port and frequency;

The protection path obtaining unit is configured to determine that the fault occurs according to the port where the alarm occurs. a service path, obtaining all optional protection paths of the failed service path according to the protection relationship;

The network management system according to claim 5, wherein the protection switching unit is further configured to: if the network management system is automatically configured to perform protection switching, the network management system determines the faulty service path and the most If the configuration command is sent to the board to perform protection switching, the configuration command is sent to the board to perform protection switching. If the network management system does not perform the protection switching automatically, the network management system receives the configuration. The protection switching is performed by the hardware after the protection related alarm is protected.

The network management system of claim 6, wherein the optimal path selection unit further comprises:

The best path determination subunit is used to determine the weighted sum and the largest protection path is the best path.

The network management system according to claim 6, wherein the protection switching unit is further configured to find a portion of the currently faulty service path that does not coincide with the selected optimal protection path; If the originating board of the best protection path of the non-coincident part is a ROADM board, you need to send a wavelength assignment command to the ROADM board: Redirect the currently faulty service path wavelength from the corresponding port of the working path. Is assigned to the corresponding port of the protection path; or,