WO2009026853A1 - Method, device and system for setting and maintaining wavelength path - Google Patents

Abstract

Method, device and system for setting wavelength path are provided by the present invention. The method includes: updating signaling message according to physical signal damage parameter information and adjustable physical signal damage parameter range information of the adjustable unit in the wavelength path during process of setting the wavelength path; the destination node judging whether or not the signal quality meets the destination node signal quality threshold according to the physical signal damage parameter included in the signaling message, if it does meet, each node of the current route setting wavelength path based on the current route, otherwise making a further judgment that whether or not the signal quality would meet the destination node signal quality threshold by adjusting the physical signal damage parameter in the adjustable physical signal damage range parameter, if it does, informing relative nodes in the current route to adjust the physical signal damage parameter, and then each node of the current route setting the wavelength path based on the current route. Method, device and system for managing wavelength path are also provided by the present invention.

Description

 FIELD OF THE INVENTION The present invention relates to wavelength division multiplexing network routing and wavelength assignment techniques, and more particularly to a method, apparatus and system for establishing and maintaining wavelength paths.

Background technique

 At present, in optical networks, the establishment of optical transmission paths is mainly divided into centralized and distributed. Centralized is that all path calculations in a domain are performed by a centralized network element (such as NMS, Network Management System) or path. The calculation unit (port (PCE, Path Computation Element) is completed; distributed is that each network unit is responsible for the calculation of the path and the establishment of the optical transmission path by the respective optical network control plane, wherein the distributed network control mechanism is more robust and applied more some more. Distributed can be divided into "signal-based" and "route-based", "signal-based" methods are mainly for extending the GMPLS signaling protocol, RWA based on TE link parameters For optimal route calculation, each node of the link collects physical signal impairment parameters of each passing node during the propagation of the setup message, such as optical power size, polarization mode dispersion (PMD, Polarization Mode Dispersion), dispersion, and attenuation. s, Amplified Emission Spontaneous, signal-to-noise ratio of the optical path, the destination node verifies whether all accumulated physical signal impairment parameters match the quality of service (QoS) of the service request, if Then, the response information is sent back to establish a light path, otherwise the optical transmission path is refused to be established and an attempt is made to re-establish it using other routes.

 The "route-based" method is mainly used to: Extend the GMPLS routing protocol, such as the Open Shortest Path First-TE (OSPF-TE) protocol, except for the TE attribute. It is also necessary to include physical signal impairment parameter information.

In an actual network, in order to improve the scalability of the network, there are often many adjustable units in the network, such as an optical power adjustment unit, a dispersion adjustment unit, etc., in the optical transmission path establishment process. The destination node establishes according to the collected physical signal damage parameter check whether it matches the QoS of the service request, and after the establishment is successful, according to the collected network performance monitoring data, by adjusting the physical signal damage parameter of the adjustable unit, Dynamically adjust and monitor the network. The tunable unit is not considered in the process of establishing the optical transmission path. If the collected physical signal impairment parameter does not match the QoS of the service request, the source node may not be sent from the optional route to select another A route is used as the current routing message, but the signal quality is matched with the QoS of the service request by adjusting the physical signal impairment parameter of the tunable unit, so that the signal quality on the established optical transmission path reaches or approaches the QoS of the service request, thereby avoiding The signal quality of the optical transmission path is determined based on the existing physical signal impairment parameters. It may be necessary to frequently select another route from the optional route as the current route, resulting in waste of network resources and even optical transmission paths. Failure to establish due to the inability to find the right resources. At the same time, when the user maintains the established connection, the tunable parameters in the network are mainly adjusted by manual manual adjustment. Such maintenance is complicated, error-prone, and the cost is high.

Summary of the invention

 In view of this, a main object of embodiments of the present invention is to provide a method for establishing a wavelength path, which improves the success rate of establishing a wavelength path.

Another object of the embodiments of the present invention is to provide an apparatus for establishing a wavelength path, which improves the success rate of establishing a wavelength path. It is still another object of embodiments of the present invention to provide a system for establishing a wavelength path to improve the success rate of wavelength path establishment. Still another object of embodiments of the present invention is to provide a method for maintaining a wavelength path, which reduces the complexity of connection maintenance in a network. Another object of the embodiments of the present invention is to provide an apparatus for maintaining a wavelength path, which reduces the complexity of connection maintenance in a network. Still another object of embodiments of the present invention is to provide a system for maintaining a wavelength path, which reduces the complexity of connection maintenance in a network. To achieve the above objective, the technical solution of the embodiment of the present invention is specifically implemented as follows: A method for establishing a wavelength path, the method includes:

 The source node calculates an optional route from itself to the destination node, and selects one route as the current route to send signaling messages;

 Each node through which the signaling message passes updates the signaling message by its physical signal impairment parameter information and the adjustable physical signal impairment range parameter information;

 After updating the received signaling message, the destination node determines, according to the physical signal impairment parameter included in the signaling message, whether the received signaling message signal quality meets a preset target node signal quality threshold, if the result is determined If yes, the current routing node establishes a wavelength path according to the current route. Otherwise, it is further determined whether the physical signal impairment parameter is adjusted within a range of the adjustable physical signal damage of the received signaling message, so that the signal quality satisfies the purpose. The node signal quality threshold value, if the determination result is yes, notifying the current routing nodes to perform physical signal impairment parameter adjustment, and then the current routing nodes establish a wavelength path according to the current route.

 a node device, where the node device includes a receiving module, a sending module, a determining module, a processing module, and a routing module, where

 The receiving module is configured to receive a message and send the message to the determining module.

 The determining module is configured to receive a message sent by the receiving module, and determine whether the message is a resource reservation message or an advertisement message, and if the message is a resource reservation message, send the resource reservation message to the a processing module, if the message is an advertisement message, sending the advertisement message to the routing module;

The processing module is configured to receive the resource reservation message sent by the determining module, and if the resource reservation message includes a calculated physical signal impairment parameter adjustment quantity, according to the calculated physical signal impairment parameter The adjustment amount is used to adjust the physical signal impairment parameter, and the resource is reserved; if the resource reservation message does not include the calculated physical signal impairment parameter adjustment amount information, the resource is reserved, and the physical component including the node device itself is sent to the sending module. Signal impairment parameters, adjustable physical signal impairment range parameters, and signaling messages for routing information; The routing module is configured to receive the advertisement message sent by the determining module, select a route from the optional route as the current route, and send the calculated routing information to the processing module;

 The sending module is configured to receive the signaling message sent by the processing module, and send the signaling message.

 a node device, where the node device includes a receiving module, a processing module, a determining module, and a sending module, where

 The receiving module is configured to receive a signaling message and send the message to the processing module.

 The processing module is configured to receive the signaling message sent by the receiving module, update the signaling message by using a physical signal impairment parameter of the node device and an adjustable physical signal damage range parameter, and send the updated signaling message to The determining module;

 The determining module is configured to receive the updated signaling message from the processing module, and determine, according to the physical signal impairment parameter included in the signaling message, whether the quality of the message signal meets a preset signal quality threshold If the judgment result is yes, the resource reservation message is sent to the sending module, otherwise it is further determined whether the physical signal damage parameter is adjusted within the range of the adjustable physical signal damage of the received signaling message, so that the signal quality satisfies the signal. a quality threshold, if the determination result is yes, sending a resource reservation message to the sending module, where the resource reservation message includes the calculated physical signal damage parameter adjustment amount and the calculated physical signal damage parameter Corresponding node information, otherwise, sending an announcement message to the sending module;

 The sending module is configured to send the resource reservation message or the notification message.

A system for establishing a wavelength path, the system comprising: a source node and a destination node, wherein the source node is configured to determine an optional route from the self to the destination node, select a route as the current route, and send a signaling message. The node that passes the signaling message updates the signaling message by using its physical signal damage parameter information and the adjustable physical signal damage range parameter information; receiving the message, if the message includes the calculated physical signal impairment parameter adjustment amount information , physical signal impairment parameter adjustment, resource reservation; if the message does not include the calculated physical signal damage Parameter adjustment amount information, resource reservation;

 The destination node is configured to receive a message, update the signaling message by using the physical signal impairment parameter and the tunable physical signal damage range parameter information, and after updating the received signaling message, according to the physics included in the signaling message The signal impairment parameter determines whether the received signaling message signal quality meets a preset target node signal quality threshold. If the determination result is yes, a resource reservation message is sent, and each node of the current route establishes a wavelength path according to the current route. Otherwise, it is further determined whether the signal quality meets the target node signal quality threshold by adjusting the physical signal impairment parameter within the adjustable physical signal damage range, and if the determination result is yes, the resource reservation message is sent, including the calculated physical The signal impairment parameter adjustment quantity information is used to notify each node of the current route to perform physical signal impairment parameter adjustment, and then each node of the current route establishes a wavelength path according to the current route.

 A method of maintaining a wavelength path, including:

 When the monitoring node detects that the parameter is equal to or lower than a preset monitoring node signal quality threshold, the monitoring node notifies the adjustment start node to start parameter adjustment;

 After receiving the notification, the adjustment start node sends a signaling message to the monitoring node; each node that passes the signaling message updates the signaling message by using its physical signal impairment parameter information and the adjustable physical signal damage range parameter information. ;

 After receiving the update signaling message, the calculating unit calculates the parameter adjustment data according to the physical signal damage parameter and the adjustable physical signal damage range parameter information included in the signaling message;

 Each node between the monitoring node and the adjustment start node adjusts parameters according to the parameter adjustment data.

 A node device, comprising:

a receiving module, configured to receive a message, where the message includes parameter adjustment information or a signaling message; a processing module, configured to receive a message sent by the receiving module, and if the parameter is adjusted, perform physical signal impairment parameter adjustment; And causing the message to update the signaling message by using the physical signal impairment parameter of the node device and the adjustable physical signal damage range parameter, and determining, according to the physical signal impairment parameter included in the updated signaling message, determining the message signal Quality Whether the preset signal quality threshold is met, and if the judgment result is yes, the updated signaling message is sent; otherwise, the notification message is sent;

 And a sending module, configured to receive the signaling message processed by the processing module, and send an updated signaling message according to the determination result of the processing module, if yes, otherwise; send an advertisement message.

 A node device, where the node device includes a receiving module, a sending module, a determining module, a processing module, and a routing module, where

 a receiving module, configured to receive a message, and send the message to the determining module;

 a judging module, configured to receive a message sent by the receiving module, and determine whether the message is a parameter adjustment message or an advertisement message, if the message is a parameter adjustment message, sent to a processing module, if the message is an advertisement message, send To the routing module.

 The processing module is configured to receive the message sent by the determining module, and perform physical signal impairment parameter adjustment according to the calculated physical signal damage parameter adjustment amount included in the message.

 a routing module, configured to receive a message sent by the determining module, select a route from the optional connected route as the current route, and send the calculated routing information to the processing module;

 The sending module is configured to receive a signaling message sent by the processing module, and send the signaling message. A system for maintaining a wavelength path, comprising: a monitoring node and an adjustment start node, wherein the monitoring node is configured to receive a signaling message, and update the physical signal impairment parameter and the adjustable physical signal damage range parameter information by using the physical signal impairment parameter And signaling, according to the physical signal impairment parameter included in the updated signaling message, determining whether the received signaling message signal quality meets the monitoring node signal quality threshold, and if the determination result is yes, sending the updated Signaling message, otherwise sending an advertisement message to the adjustment start node, notifying the adjustment start node to start maintenance of parameter adjustment;

The adjustment start node is configured to receive the notification information sent by the monitoring node, perform parameter adjustment maintenance, and send a signaling message; the signaling message includes its physical signal damage parameter information and an adjustable physical signal damage range. Parameter information. It can be seen from the above technical solution that a method, device and system for establishing a wavelength path in the embodiment of the present invention take into account the range of adjustable physical signal impairment parameters of the adjustable unit on the wavelength path in the process of establishing the wavelength path, The tunable physical signal damage parameter and its range parameter of each adjustable unit in the path are collected, and each node passing through the signaling message updates the signaling message by its physical signal damage parameter information and the adjustable physical signal damage range parameter information. When the destination node determines that the signal quality of the signaling message cannot meet the signal quality threshold of the destination node, it determines whether the physical signal impairment parameter can be adjusted within the range of the adjustable physical signal damage, so that the signal quality satisfies the target node signal quality threshold. The relevant node may perform physical signal impairment parameter adjustment, thereby improving the utilization of network resources and the success rate of wavelength path establishment. Meanwhile, a method for maintaining a wavelength path according to an embodiment of the present invention considers the range of the adjustable physical signal damage parameter of the adjustable unit on the monitoring wavelength path during the maintenance process, and the monitoring node determines that the quality of the monitoring parameter signal cannot be satisfied. When monitoring the preset signal quality threshold of the node, the monitoring node announces that the adjustment start node starts parameter adjustment maintenance, and the adjustment start node sends a signaling message to the monitoring node, and the signaling is adjustable along the path collection monitoring path. The physical signal damage parameter and its range parameter, each node passing through the signaling message updates the signaling message by its physical signal damage parameter information and the adjustable physical signal damage range parameter information, and the calculating unit calculates the update signaling message according to the received update signal message. The parameter adjusts the data, and sends the signaling message to each node along the monitoring node and the adjustment start node, and each node adjusts the parameter according to the parameter adjustment data included in the signaling message, thereby reducing connection maintenance in the network. The complexity.

DRAWINGS

 FIG. 1 is a schematic structural diagram of a system for establishing a wavelength path according to an embodiment of the present invention; FIG.

 FIG. 1b is a schematic structural diagram of a source node according to an embodiment of the present invention;

 Figure lc is a schematic structural diagram of an intermediate node according to an embodiment of the present invention;

 FIG. 1d is another schematic structural diagram of an intermediate node according to an embodiment of the present invention;

 Figure le is a schematic structural diagram of a destination node according to an embodiment of the present invention;

2 is a schematic structural diagram of a system for establishing and maintaining a wavelength path according to Embodiments 1 and 3 of the present invention; 3 is a schematic flowchart of a method for establishing a wavelength path according to Embodiment 2 of the present invention;

 4a is a schematic structural diagram of a system for maintaining a wavelength path according to an embodiment of the present invention;

 4b is a schematic structural diagram of a monitoring node according to an embodiment of the present invention;

 4c is another schematic structural diagram of a monitoring node according to an embodiment of the present invention;

 4d is a schematic structural diagram of an intermediate node according to an embodiment of the present invention;

 4e is a schematic structural diagram of adjusting a start node according to an embodiment of the present invention;

 FIG. 5 is a schematic flowchart of a method for maintaining a wavelength path according to an embodiment of the present invention;

 FIG. 6 is a schematic structural diagram of a system for maintaining a wavelength path according to Embodiment 4 of the present invention.

detailed description

 The present invention will be further described in detail below with reference to the drawings and embodiments.

 In a wavelength division multiplexing (WDM) optical network, any two nodes are connected by one or more optical fibers, each fiber can support multiple wavelengths, and the input and output optical transmission paths between the two nodes Cross-connection can be performed to dynamically reconstruct the optical network. When the client layer service arrives, the wavelength division multiplexing optical network needs to allocate routes and select wavelengths for each service, establish an optical transmission path for service transmission, and provide light according to the service. Transmission path requirements, in order to establish an optical transmission path connection, it is necessary to calculate a route and allocate a corresponding wavelength. This process is called Route and Wavelength Assignment (RWA), and its corresponding calculation method is called RWA algorithm. The RWA algorithm of optical transmission path is one of the core problems of optical network. It is to solve how to find a suitable optical transmission path and reasonably allocate the wavelength used by the channel, so that limited resources can fully play to provide as much as possible. Communication capacity, improve the efficiency of the network.

The RWA algorithm involves optimization problems. The complexity of some optimization methods increases sharply with the increase of the network scale. Therefore, the RWA problem is often broken into the selection routing sub-problem and the wavelength assignment sub-problem, which are solved in two steps. For example, for the dynamic RWA algorithm, route routing is first performed, and the routes are classified into three types: fixed route, alternate route, adaptive route, fixed route using Shortest Path algorithm; alternate route is multiple shortest paths, The wavelength resource is not on the first path When it is enough, try again. The adaptive routing is based on the state of the network. The number of optical transmission paths on each fiber is balanced as much as possible. After selecting a route, the wavelength is allocated. (FF, First-Fit) algorithm, Max-Sum, LI, Least Influence, MU, Most-Used, or Least-Used Algorithms are used to assign wavelengths.

 In addition, a multi-protocol label switching (MPLS) protocol router can also be used. In order to support non-packet-type networks, a generalized multi-protocol label switching (GMPLS, Generalized MPLS) protocol and a GMPLS-based resource are proposed. GMPLS RSVP-TE (GMPLS Resource Reservation Protocol-Traffic Engineering) can extend MPLS to the optical layer. After GMPLS is used, a unified optical network control plane can be implemented.

 In the embodiment of the present invention, the tunable physical signal damage parameter range of the tunable unit on the wavelength path is taken into consideration in the process of establishing the wavelength path, and the routing protocol of the GMPLS is not modified, in the original "signal-based manner" The method is optimized, according to the existing route calculation method, the selectable route is calculated and a route is selected as the current route, and each node passing through the signaling message is updated by its physical signal damage parameter information and the adjustable physical signal damage range parameter information. The signaling message, after the destination node updates the received signaling message, determines whether the quality of the received signaling message satisfies the preset target node signal quality threshold according to the physical signal impairment parameter included in the signaling message, Then, each node of the current route establishes a wavelength path according to the current route, and further determines whether the physical signal impairment parameter can be adjusted within a range of the adjustable physical signal damage of the received signaling message, so that the signal quality satisfies the target node signal. Quality threshold, you can inform the station Related nodes physical damage parameter adjustment signal current route, the current route and the wavelength path established by each node of the current route. The method for establishing a wavelength path in the "route-based manner" is not included in the scope of the embodiment of the present invention, and details are not described herein again.

 In order to achieve the above object, an embodiment of the present invention proposes a system for establishing a wavelength path.

FIG. 1 is a schematic structural diagram of a system for establishing a wavelength path according to an embodiment of the present invention. See Figure la, the department The system includes: a source node 11, an intermediate node 12, and a destination node 13, wherein

 The source node 11 is configured to determine an optional route from the self to the destination node 13, select a route as the current route, and send a signaling message, including the physical signal impairment parameter information and the adjustable physical signal damage range parameter information. The next node sends; receives the resource reservation message sent by the next node, if the resource reservation message includes the calculated physical signal impairment parameter adjustment amount information, performs corresponding physical signal impairment parameter adjustment and resource reservation, if the received resource is pre- The remaining message does not include the calculated physical signal impairment parameter adjustment amount information, and performs resource reservation; receives the advertisement message sent by the destination node 13, and selects another route from the optional route as the current route;

 The intermediate node 12 is configured to receive the signaling message sent by the previous node and the resource reservation message sent by the next node. If it is a signaling message, the physical signal impairment parameter and the adjustable physical signal damage range parameter update signaling are used. The message is sent to the next node. If the message is reserved for the resource, and the resource reservation message includes the calculated physical signal impairment parameter adjustment amount information, the corresponding physical signal impairment parameter adjustment is performed, and the resource is reserved and the resource reservation message is forwarded. Up to the previous node, if the resource reservation message does not include the calculated physical signal impairment parameter adjustment amount information, perform resource reservation and forward the resource reservation message to the previous node;

 The destination node 13 and the preset target node signal quality threshold are used for receiving the signaling message from the previous node, and updating the signaling message by using the physical signal impairment parameter and the adjustable physical signal damage range parameter information, after the update is completed. After receiving the signaling message, determining, according to the physical signal impairment parameter included in the signaling message, whether the quality of the received signaling message signal satisfies the target node signal quality threshold, and sending a resource reservation message to the upper node, otherwise Further determining whether the physical signal impairment parameter is adjusted within the adjustable physical signal damage range, so that the signal quality can meet the target node signal quality threshold, and then the physical signal impairment parameter is adjusted, and the resource reservation message is sent to the upper node. The resource reservation message includes the calculated physical signal impairment parameter adjustment amount information. Otherwise, the advertisement message is sent to the source node 11, and the source node 11 is notified to select another route from the optional route as the current route.

FIG. 1b is a schematic structural diagram of a source node according to an embodiment of the present invention. See Figure lb, where source node 11 The receiving module 111, the processing module 112, the determining module 114, the routing module 115, and the sending module 116, where

 The receiving module 111 is configured to receive a message and send the message to the determining module 114.

 The determining module 114 is configured to receive the message sent by the module 111, and determine whether the message is a resource reservation message or an advertisement message. If the message is a resource reservation message, send the message to the processing module 112. If the message is an advertisement message, the routing module 115 is sent to the routing module 115. Send

 The processing module 112 is configured to receive the message sent by the determining module 114. If the message includes the calculated physical signal impairment parameter adjustment amount information, perform corresponding physical signal impairment parameter adjustment, and reserve resources, if the message does not include the calculated physical signal. The parameter of the impairment parameter is adjusted, and the resource is reserved; the signaling message is sent to the sending module 116, including the physical signal impairment parameter, the adjustable physical signal damage range parameter, and the routing information;

 The routing module 115 is configured to receive the notification message sent by the determining module 114, select a route from the optional route as the current route, and send the calculated routing information to the processing module 112. The sending module 116 is configured to receive the processing module 112. The signaling message is sent, and the signaling message is sent out.

 FIG. 1c is a schematic structural diagram of an intermediate node according to an embodiment of the present invention. Referring to FIG. 1c, the intermediate node 12 includes a receiving module 121, a processing module 122, and a sending module 126, where

 The receiving module 121 is configured to receive a message and send the message to the processing module 122.

The processing module 122 is configured to receive the message sent by the receiving module 121, if the message is a signaling message, update the signaling message by using the physical signal impairment parameter of the node device and the adjustable physical signal damage range parameter, and the updated signaling message Sending to the sending module 126; if the message is a resource reservation message, according to whether the resource reservation message includes the calculated physical signal damage parameter adjustment amount information, if the resource reservation message includes the calculated physical signal damage parameter adjustment amount information, After the corresponding physical signal impairment parameter adjustment and resource reservation, the resource reservation message is sent to the sending module 126. If the resource reservation message does not include the calculated physical signal impairment parameter adjustment amount information, the resource reservation message is performed after the resource reservation is performed. Send to the sending module 126; The sending module 126 is configured to receive the signaling message and the resource reservation message sent by the processing module 122, and send the message.

 In an actual application, the intermediate node 12 may further include a determining module 124;

 FIG. 1d is another schematic structural diagram of an intermediate node according to an embodiment of the present invention. Referring to Figure Id, the intermediate node 12 includes a receiving module 121, a processing module 122, a determining module 124, and a sending module 126, wherein the receiving module 121 is configured to receive a message and send it to the processing module 122.

 The processing module 122 is configured to receive the message sent by the receiving module 121, and if the message is a signaling message, update the signaling message by using the physical signal impairment parameter of the node device and the adjustable physical signal damage range parameter, and the updated signaling message Sending to the judging module 124; if the message is a resource reservation message, according to whether the resource reservation message includes the calculated physical signal damage parameter adjustment amount information, if the resource reservation message includes the calculated physical signal damage parameter adjustment amount information, After the corresponding physical signal impairment parameter adjustment and resource reservation, the resource reservation message is sent to the sending module 126. If the resource reservation message does not include the calculated physical signal impairment parameter adjustment amount information, the resource reservation message is performed after the resource reservation is performed. Send to the sending module 126;

 The determining module 124 is configured to receive the signaling message output by the processing module 122, and determine, according to the physical signal impairment parameter included in the signaling message, whether the received signal quality meets a preset target node signal quality threshold, and then sends the signal to the target node. The module 126 forwards the signaling message. Otherwise, it is further determined whether the physical signal impairment parameter can be adjusted within the tunable physical signal damage range, so that the signal quality meets the target node signal quality threshold, and the signaling message can be forwarded to the sending module 126. If not, sending an advertisement message to the sending module 126, informing the source node 11 to select another route from the optional route as the current route;

 The sending module 126 is configured to receive the signaling message sent by the determining module 124, the notification message, and the resource reservation message sent by the processing module 122, and send the message.

FIG. 3 is a schematic structural diagram of a target node according to an embodiment of the present invention. Referring to the diagram, the destination node 13 includes a receiving module 131, a processing module 132, a determining module 134, and a sending module 136, wherein the receiving module 131 is configured to receive a message and send it to the processing module 132. The processing module 132 is configured to receive the signaling message sent by the receiving module 131 and the resource reservation message sent by the determining module 134. If the signaling message is used, the physical signal impairment parameter of the node device itself and the adjustable physical signal damage range parameter are updated. The signaling message is sent to the judging module 134; if the resource reservation message is used, according to whether the resource reservation message includes the calculated physical signal impairment parameter adjustment amount information, if the resource reservation message includes the calculated physical signal impairment parameter adjustment amount After the physical signal impairment parameter adjustment and the resource reservation are performed, the resource reservation message is sent to the sending module 136. If the resource reservation message does not include the calculated physical signal impairment parameter adjustment amount information, the resource is reserved after the resource reservation. The reservation message is sent to the sending module 136;

 The determining module 134 is configured to receive the signaling message sent by the processing module 132, and determine, according to the physical signal impairment parameter included in the signaling message, whether the quality of the received signaling message signal meets a preset target node signal quality threshold, Then, the resource reservation message is sent to the processing module 132. Otherwise, it is further determined whether the physical signal impairment parameter can be adjusted within the range of the adjustable physical signal damage, so that the signal quality satisfies the target node signal quality threshold, and the physical signal impairment parameter is Performing adjustment, sending a resource reservation message to the processing module 132, including the calculated physical signal impairment parameter adjustment amount information; otherwise, sending an advertisement message to the sending module 136;

 The sending module 136 is configured to receive the resource reservation message sent by the processing module 132 and the notification message sent by the determining module 134, and send the message.

 The specific embodiments of the present invention will be described in detail below with reference to two embodiments.

 Embodiment 1:

FIG. 2 is a schematic structural diagram of a system for establishing a wavelength path according to an embodiment of the present invention. Referring to FIG. 2, in this embodiment, the network includes five network elements (NE, Network Element), which are respectively NE A, NE B, NE C, NE D, and NE E, and NE A is connected to NE B and NE D respectively. NE E is connected to NE C and NE D respectively, NE B is connected to NE A, NE C and NE D respectively, and NE C is connected to NE B, NE D and NE E respectively. NE A is the source network unit, NE E is the destination network unit, and the optical power is assumed to be the only physical signal impairment parameter considered by the embodiment of the present invention. The variable optical attenuation unit (VOA, Variable Optical Attenuator) is the only consideration for the adjustable pair. Physical signal impairment parameter The unit that performs the adjustment.

 If there is a connection request between NE A and NE E, the optical power of the received signal required by NE E cannot be lower than -18dbm. According to the foregoing, the physical signal impairment is not considered in the routing algorithm from NE A to NE E. It is assumed that the ADE-based algorithm calculates the ADE path as the current route, and NE A includes the signaling RSVP-TE PATH message in the setup message. The optical power value parameter and the optical power adjustable range parameter, each of the passed network elements, before the signaling message is transmitted, the signaling message is updated by the optical power value parameter of the own unit and the optical power adjustable range parameter, In the embodiment, only the intermediate network unit NE D, the NE D updates the signaling message by using the optical power value parameter of the own network unit and the optical power adjustable range parameter, and outputs the signal to the NE E, and the NE E passes its own optical power value parameter and The optical power adjustable range parameter update signaling message, after the NE E updates the received signaling message, compares the optical power value parameter included in the signaling message with the optical power threshold parameter required by the NE E;

 Assume that NE E determines that the received optical power is -17dbm, which is higher than the optical power threshold required by NE E - 18dbm, and each node of the current route establishes a wavelength path according to the current route;

 Assume that NE E judges that the received optical power is - 20dbm, which is lower than the optical power threshold required by NE E - 18dbm, but NE E can be adjusted by adjusting the optical power adjustable range parameter of the received signaling message. The light attenuation of NE D is 2db, so that the optical power value received by NE E can reach the optical power threshold required by NE E. In practical applications, it can also adjust NE A or NE E or any of the three network elements. The optical attenuation of two network elements or all three network elements, so that the optical power value received by NE E can reach the optical power threshold required by NE E. Therefore, the NE E sends a resource reservation message, such as a signaling RSVP-TE RESV message (the RESV message format of the original RSVP-TE needs to be extended, the following is the same), and the RSVP-TE RESV message is sent back to the NE A along the EDA. Each node in the current route performs reserved resources, and the related nodes perform optical attenuation adjustment in the dimming attenuation unit of the corresponding network unit;

Assume that NE E judges that the received optical power is - 30dbm, which is lower than the optical power threshold required by NE E - 18dbm, while NE E adjusts the optical power range of NE A, NE D, NE E, and finds anyway. The adjustment can not make the receiving optical power value of NE E reach -18dbm or more. At this time, NE E通 The notification message is sent to the NE A. The NE A receives the notification message and re-selects a route for calculation. Assume that the NE A selects the route ABCE. In the same way, the NE A generates a signaling RSVP-TE PATH message, and the message includes its own light. The power value parameter and the optical power adjustable range parameter, each of the passed network elements, before the signaling message is transmitted, the signaling message is updated by the optical power value parameter of the own network unit and the optical power adjustable range parameter, and the NE E is updated. After receiving the signaling message, the optical power value parameter included in the signaling message is compared with the optical power threshold parameter required by NE E. It is assumed that NE E determines that the received optical power is -25dbm, which is lower than NE E. The required optical power threshold is -18dbm, but the optical power can be adjusted by the VOA of NE A and NE C, so that the optical power value received by NE E can reach the optical power threshold of -18dbm required by NE E. Therefore, the RSVP-TE RES V message is sent back to NE A along ECB-A. Each node in the current route NE E, NE C, NE B, NE A reserves resources, and the VOA of NE Α and NE C adjusts the optical fading.

 Assume that NE E judges that the received optical power is -25dbm, which is lower than the optical power threshold required by NE E - 18dbm, but can adjust the optical power of NE E, NE D and NE A to receive the optical power of NE E. The value of the optical power threshold of the NE E is more than 18 dbm. Therefore, the NE E notifies the NE A to adjust the optical power parameter through the notification message. The current route recalculates the optical power value parameter, and the NE A receives the notification message to generate the signaling RSVP. - TE PATH message, each traversing network element, before propagating the signaling message, adjusts the optical power to the recommended value in the notification message through the VOA of the network element, and then updates the optical power value through the network unit. After the message is updated, the NE E compares the received optical signal value with the optical power threshold parameter required by the NE E, if the NE E determines the light received at this time. The power is -17dbm, which is higher than the optical power threshold required by NE E - 18dbm. Then NE E sends an RSVP-TE RESV message back to NE A along the EDA. Each node in the current route reserves resources; If the received optical power is lower than the optical power threshold required by NE E - 18dbm, NE E notifies NE A to re-select another route from the optional route as the current route.

If there are multiple parameters of the tunable physical signal damage range to be considered, and there is a certain correlation between multiple parameters, the destination network unit can adjust multiple correlations according to certain strategies and algorithms. The physical signal damage range parameters are adjusted to establish a preferred wavelength path.

 Embodiment 2:

 FIG. 3 is a schematic flowchart of a method for establishing a wavelength path according to Embodiment 2 of the present invention. Referring to Figure 3, the process includes:

 Step 301: Calculate an optional route from the source node to the destination node, and select a route as the current route to send signaling messages.

 In this step, the target node signal quality threshold is set in advance, and various physical signal impairment parameters in the network are not considered, and the optional route from the source node to the destination node is calculated according to the TE link parameter and the existing route calculation method. And selecting a route from the optional route as the current route, sending a signaling message.

 Step 302: Each node that passes the signaling message updates the signaling message by using its physical signal impairment parameter and the adjustable physical signal damage range parameter information.

 In this step, the PATH message format of the original RSVP-TE needs to be extended. In the following description, the RSVP-TE PATH message indicates that the original PATH message format of the original RSVP-TE is extended. The source node is in the setup. The signaling RSVP-TE PATH information in the message includes its own physical signal impairment parameter and the adjustable physical signal impairment range parameter, and the intermediate node passes the physical signal impairment parameter and the adjustable physical signal impairment of the node before propagating the signaling message. The range parameter updates the signaling message up to the destination node.

 In practical applications, the physical signal impairment parameter and the adjustable physical signal damage range parameter may be - corresponding, such as the optical power parameter corresponding to the tunable optical power range parameter; or may not be - corresponding, such as the set physical signal If the damage parameter is not adjustable, there is no corresponding adjustable physical signal damage range parameter. The updating of the signaling message by each node through its physical signal impairment parameter information and the adjustable physical signal impairment range parameter information may be performed according to a preset setting.

In practical applications, when transmitting signaling messages along the current route, each node updates the signaling message by its physical signal impairment parameter information and the tunable physical signal damage range parameter information, and may also reserve each node resource at the same time. First take up, to avoid subsequent wavelength paths At this time, the node resource has been occupied by other wavelength path request requests.

 Step 303: After updating the received signaling message, the destination node determines, according to the physical signal impairment parameter included in the signaling message, whether the received signal quality satisfies the target node signal quality threshold, and the current routing node is currently The route establishes a wavelength path. If not, step 304 is performed. In this step, the destination node receives the RSVP-TE PATH information that is transmitted through the current route, and the physical information damage parameter information and the adjustable physical signal damage range parameter. The information update signaling message may be obtained by accumulating the physical signal impairment parameter, or by saving the physical signal impairment parameter, accumulating by the destination node, and storing the adjustable physical signal damage range parameter, the destination node. And determining, according to the updated physical signal impairment parameter, if the signal quality of the destination node meets the target node signal quality threshold, sending a resource reservation message to the source node; if the target node signal quality threshold is not met, performing step 304.

 If the resource of each node is reserved in step 302, if the signal quality of the destination node satisfies the signal quality threshold of the destination node, the resource reservation success message is directly sent to the source node, and the reserved node is not required. The step of resources, if the target node signal quality threshold is not met, step 304 is performed.

 Step 304: Determine, according to the tunable physical signal damage range parameter information included in the signaling message, if the signal quality can meet the target node signal quality threshold by adjusting the parameter, notify each node to reserve the resource by using a resource reservation message. The message includes the node information corresponding to the calculated physical signal damage parameter adjustment amount and the calculated physical signal damage parameter adjustment amount, and the current routing related node, that is, the calculated physical signal damage parameter adjustment amount, performs physical signal damage parameter adjustment or The parameter is adjusted by using the parameter information included in the resource reservation success message. If the parameter is not satisfied, the source node is notified by the notification message to select another route from the optional route as the current route, and step 301 is performed.

In this step, the parameter adjustment may be to adjust some parameters of the adjustable physical signal damage range parameter, or may adjust the adjustable physical signal damage range parameter of all nodes in the entire current route, and multiple adjustable physical signal damages. Range parameters are related, the destination node is last According to the correlation, the specific method of the adjustment may be determined by the destination node according to its own strategy and the corresponding algorithm; the resource reservation message may be implemented by extending the resource reservation protocol (RESV) of the RSVP-TE protocol. The source node is returned along the path opposite to the current route. At the same time, each node of the current route reserves resources and performs physical signal impairment parameter adjustment at the corresponding node.

 If the destination node determines that the signal quality cannot meet the signal quality threshold after adjusting the parameters, it can directly send an advertisement message to the source node, informing the source node to select another route from the optional route as the current route.

 If the resources of each node are reserved in step 302, if the physical signal impairment parameter is adjusted within the tunable physical signal impairment range, the signal quality can satisfy the target node signal quality threshold, and the relevant node in the current route is notified. Performing physical signal impairment parameter adjustment, sending a resource reservation success message to the source node, and then the current routing node establishes a wavelength path according to the current route according to the reserved resource, otherwise, sending an advertisement message to the source node to release each node. Reserved resources.

 In addition, if an intermediate node is included between the source node and the destination node, the intermediate node may also initiate a judgment on the received signal quality. When it is determined that the received signal quality cannot meet the quality of service requirement through the physical signal impairment parameter adjustment, the source node is The notification message is sent, and another route is selected as the current route from the optional route. The signaling message is continuously transmitted to the destination node only when it is judged that the received signal quality meets the quality of service requirement.

If, in step 302, the signaling message is transmitted along the current route, each node reserves the signaling message while updating the signaling message by using the physical signal impairment parameter information and the adjustable physical signal impairment range parameter information, and then step 304 is: After updating the received signaling message, the destination node determines whether the received signal quality satisfies the target node signal quality threshold according to the physical signal impairment parameter included in the signaling message, and the current routing node establishes the wavelength path according to the current route. Otherwise, it is further determined whether the physical signal impairment parameter can be adjusted within the range of the tunable physical signal damage of the received signaling message, so that the signal quality satisfies the target node signal quality threshold, if the physical signal impairment parameter is adjusted , so that the signal quality satisfies the target node signal quality threshold, then Knowing that the relevant node in the current route performs physical signal impairment parameter adjustment, and then the current routing node establishes a wavelength path according to the current route. If not, the notification message is used to notify the source node to select another route from the optional route as the current route, and Release the reserved node resources.

 In the actual application, in step 304, in order to increase the reliability of the wavelength path establishment, the resource reservation message includes the calculated physical signal damage parameter adjustment amount information, the calculated node information corresponding to the physical signal damage parameter adjustment amount, and The wavelength path re-authentication information, when the resource reservation message returns a source node or an intermediate node of the current route along a path opposite to the current route, the adjusted physical signal impairment parameter is included in the resource reservation message, and is calculated according to the destination node. The tunable physical signal damage range parameter is parameter-adjusted at the node corresponding to the calculated physical signal impairment parameter adjustment amount, and may also be directly advertised from the destination node to the source node or an intermediate node of the current route, the source node or the current route. An intermediate node receives a resource reservation message including wavelength path re-authentication information, and each node of the current route re-propagates the signaling message along the current route, and the source node or an intermediate node of the current route updates the signaling message again along the foregoing path, and the purpose is Node is updating After receiving the signaling message, determining, according to the physical signal impairment parameter included in the signaling message, whether the received signaling message signal quality can meet the target node signal quality threshold, and the current routing node establishes the wavelength according to the current route. Path; if not, that is, the received signaling message signal quality does not satisfy the target node signal quality threshold, and further can determine whether the physical signal impairment can be adjusted within the range of the adjustable physical signal impairment of the received signaling message. The parameter is such that the signal quality satisfies the target node signal quality threshold, and the current routing related node may perform physical signal impairment parameter adjustment, and then the current routing node establishes a wavelength path according to the current route; , the source node is notified to select another route from the optional route as the current route. In this way, the reliability of the wavelength path can be further verified, especially in the case that there are many parameters of the adjustable physical signal damage range that need to be adjusted, that is, the reliability of the established wavelength path may be low due to consideration of more physical factors. In this case, the current route is verified for reliability again, which increases the reliability of the wavelength path establishment.

In order to achieve the above object, an embodiment of the present invention also provides a system for maintaining a wavelength path. 4a is a schematic structural diagram of a system for maintaining a wavelength path according to an embodiment of the present invention. Referring to FIG. 4a, the system includes: a monitoring node 41, an intermediate node 42 and an adjustment start node 43, wherein

 The monitoring node 41, the preset monitoring node signal quality threshold value, is used for receiving the signaling message, updating the signaling message by its physical signal impairment parameter and the adjustable physical signal damage range parameter information, and updating the received signaling after updating After the message, according to the physical signal impairment parameter included in the signaling message, it is determined whether the received signaling message signal quality meets the monitoring node signal quality threshold. If the judgment result is yes, the next node sends a signaling message, otherwise An announcement message is sent to the adjustment start node 43, and the adjustment start node 43 is notified to start maintenance of parameter adjustment. And the corresponding physical signal damage parameter adjustment can be performed according to the received parameter adjustment data.

 The intermediate node 42 is configured to receive the signaling message sent by the previous node, and send the signaling message to the next node by using its physical signal impairment parameter and the adjustable physical signal impairment range parameter update signaling message.

 The adjustment start node 43 is configured to receive the notification information sent by the monitoring node 41, perform parameter adjustment maintenance, and send a signaling message; the signaling message includes its physical signal damage parameter information and the adjustable physical signal damage range parameter. information. The adjustment start node may perform corresponding physical signal impairment parameter adjustment according to the received parameter adjustment data.

 FIG. 4b is a schematic structural diagram of a monitoring node 41 according to an embodiment of the present invention. Referring to FIG. 4b, the monitoring node 41 includes a receiving module 411, a processing module 412, a determining module 414, and a sending module 416, wherein the receiving module 411 is configured to receive a message and send it to the processing module 412;

 The processing module 412 is configured to receive a message sent by the receiving module 411, where the message includes parameter adjustment information or a signaling message, and if it is parameter adjustment information, perform corresponding physical signal impairment parameter adjustment; if it is a signaling message, pass the node The device's own physical signal damage parameter and adjustable physical signal damage range parameter update the message, sent to the judgment module 414;

The determining module 414 is configured to receive the message from the processing module 412, and determine whether the quality of the message signal meets a preset signal quality threshold according to the physical signal impairment parameter included in the signaling message, and directly send the signaling message To the sending module 416, otherwise sending an announcement message to the sending module 416; The sending module 416 is configured to send a signaling message or an announcement message.

 In another case, the monitoring node 41 also includes a computing module 415.

 FIG. 4c is another schematic structural diagram of the monitoring node 41 according to an embodiment of the present invention. Referring to FIG. 4c, the monitoring node 41 includes a receiving node 41, a receiving module 411, a processing module 412, a determining module 414, a calculating module 415, and a sending module 416, where

 The receiving module 411 is configured to receive a message and send the message to the processing module 412.

 The processing module 412 is configured to receive a message sent by the receiving module 411, where the message includes parameter adjustment information or a signaling message, and if it is parameter adjustment information, perform corresponding physical signal impairment parameter adjustment; if it is a signaling message, pass the node The physical signal impairment parameter of the device itself and the adjustable physical signal damage range parameter update the signaling message, and sent to the determining module 414;

 The determining module 414 is configured to receive the message from the processing module 412, and determine whether the quality of the message signal meets a preset signal quality threshold according to the physical signal impairment parameter included in the signaling message, and directly send the signaling message To the sending module 416, otherwise it is determined whether the signaling message is transmitted from the adjustment start node 43, if yes, the signaling message is sent to the calculation module 415, otherwise the notification message is sent to the sending module 416;

 The calculation module 415 is configured to receive the signaling message sent by the determining module 414, calculate the parameter adjustment data according to the signaling message, and send the signaling message including the parameter adjustment data to the sending module 416.

 The sending module 416 is configured to send a signaling message or an announcement message.

 FIG. 4d is a schematic structural diagram of an intermediate node 42 according to an embodiment of the present invention. Referring to FIG. 4d, the intermediate node 42 includes a receiving module 421, a processing module 422, and a sending module 426, where

 The receiving module 421 is configured to receive a message and send the message to the processing module 422.

 The processing module 422 is configured to receive the signaling message sent by the receiving module 421, and send the updated signaling message to the sending module 426 by using the physical signal impairment parameter of the node device and the adjustable physical signal damage range parameter update signaling message. .

The sending module 426 is configured to receive the signaling message sent by the processing module 422 and send it out. 4e is a schematic structural diagram of adjusting a start node according to an embodiment of the present invention. Referring to FIG. 4e, the adjustment start node 43 includes a receiving module 431, a processing module 432, a determining module 434, a routing module 435, and a sending module 436, where

 The receiving module 431 is configured to receive a message and send the message to the determining module 434.

 The determining module 434 is configured to receive the message sent by the receiving module 431, and determine whether the message is a parameter adjustment information or an announcement message. If the parameter adjustment information is sent to the processing module 432, perform corresponding physical signal impairment parameter adjustment; The signaling message is updated by the physical signal impairment parameter of the node device itself and the adjustable physical signal damage range parameter, and sent to the determining module 414; if the message is an announcement message, sent to the routing module 435;

 The processing module 432 is configured to receive the message sent by the determining module 434, perform corresponding physical signal impairment parameter adjustment, and send the signaling message to the sending module 436, including the physical signal impairment parameter, the adjustable physical signal damage range parameter, and the routing information;

 The routing module 435 is configured to receive the notification message sent by the determining module 434, select a route from the optional connected route as the current route, and send the calculated routing information to the processing module 432;

 The sending module 436 is configured to receive the signaling message sent by the processing module 432, and send the signaling message.

 In order to achieve yet another object, embodiments of the present invention provide a method of maintaining a wavelength path. FIG. 5 is a schematic flowchart of a method for maintaining a wavelength path according to Embodiment 3 of the present invention. Referring to Figure 5, the process includes:

 Step 501: Determine whether the monitoring node meets the preset monitoring node signal quality threshold. If the condition is not met, go to step 502. If the condition is met, return to step 501.

In this step, the monitoring node may be any node other than the source node, and the default configuration is the destination node, and the monitored threshold is pre-configured on the monitoring node. If the monitoring node detects that the parameter does not meet the preset monitoring node signal quality threshold, the user may also be notified that the user determines whether to start parameter adjustment. Step 502: The monitoring node announces that the adjustment start node starts maintenance of parameter adjustment.

 In this step, the adjustment start node may be any node between the monitoring node and the source node, but the adjustment start node and the monitoring node cannot be the same node, and the default configuration is the source node.

 Step 503: The adjustment start node sends a signaling message to the monitoring node.

 In practical applications, the signaling message sent by the adjustment starting node to the monitoring node generally uses the Path message in the RSVP-TE.

 Step 504: Each node that passes the signaling message updates the signaling message by using its physical signal impairment parameter and the adjustable physical signal impairment range parameter information.

 Step 505: After receiving the update signaling message, the calculating unit calculates the parameter adjustment data according to the physical signal impairment parameter and the adjustable physical signal damage range parameter information included in the signaling message.

 In this step, the computing unit may be a monitoring node or a centralized computing unit. The updated signaling message including the physical signal impairment parameter and the adjustable physical signal impairment range parameter information is reported to the centralized computing unit by the monitoring node for calculation.

 In practice, the calculation unit may also send the calculated parameter adjustment data to the user, and the user may determine whether to receive, and the user may also actively correct the parameter adjustment data calculated by the calculation unit.

 Step 506: The calculation unit sends parameter adjustment data to each node between the monitoring node and the adjustment start node, and each node along the way adjusts the parameter according to the parameter adjustment data.

 In this step, if the calculation unit is a monitoring node, the monitoring node sends a signaling message including parameter adjustment data to the adjustment start node, and each node along the monitoring node and the adjustment start node receives the parameter adjustment data. After the signaling message, adjust its own parameters. If the calculation unit is a centralized calculation unit, the instruction including the parameter adjustment data is directly distributed by the centralized calculation unit to the monitoring node, the adjustment start node, and the nodes along the monitoring node and the adjustment start node, and the above nodes receive the parameter adjustment. After the data command, adjust its own parameters.

The specific embodiments of the present invention will be described in detail below with reference to two embodiments. Embodiment 3:

 FIG. 2 is a schematic structural diagram of a system for maintaining a wavelength path according to Embodiment 3 of the present invention. Referring to FIG. 2, in this embodiment, NE A is a source network element, NE E is a destination network element, and 4 optical power is the only physical signal impairment parameter considered in the embodiment of the present invention, and VOA is the only consideration for the adjustable pair. A unit that regulates physical signal impairment parameters.

 If there are two connection paths from NE A to NE E, namely ADE and ADCE, and the set monitoring node is NE E, the monitoring threshold requires that the received signal optical power exceeds -16dbm, and NE A is set as the adjustment start node. . When the parameter value monitored by the monitoring node NE E is equal to or less than -16dbm, for example, NE E monitors the ADE optical power to be -16dbm and the ADCE optical power is -17dbm. In order to reach the monitoring threshold, the monitoring node NE E can There are two choices, one is to automatically announce the adjustment start node NE A to start the parameter adjustment maintenance; the second is to report this information to the user, and the user determines whether to start the parameter adjustment maintenance, if the user does not require parameter adjustment maintenance, unless If the monitoring node detects that the information has reached the monitoring threshold, the event will always exist on the user interface. If the user requests parameter adjustment maintenance, the monitoring node NE E notifies the adjustment start node NE A to start maintenance of parameter adjustment.

 The adjustment start node NE A sends RS VP-TE Path information to the monitoring node NE E, and the signaling message collects physical signal impairment parameters and adjustable physical signal damage range parameters corresponding to each node of the two connections along the ADE and ADCE, respectively. Information, the monitoring node NE E receives the updated signaling message, and calculates the parameter adjustment data: by adjusting the light attenuation ldb of the NE D, the optical power of the corresponding ADE is increased by ldb, and the light attenuation of the NE C is adjusted by 2db. The optical power of the corresponding ADCE is increased by 2db. In practical applications, it is also possible to adjust the optical power of NE E or NE E or any two network elements of four network elements or all four network elements, so that the optical power value received by NE E can reach NE E requirements. Above the optical power threshold.

After the calculation is completed, the monitoring node NE E has two choices at this time: First, the signaling message including the parameter adjustment data is directly transmitted back to the adjustment start node NE A through the EDA and the ECDA; second, the parameter adjustment data is sent to User, the user determines whether to receive, and the user can also The parameter adjustment data is actively corrected. Finally, the parameter adjustment data confirmed by the user is returned to the monitoring node NE E, and the signaling message including the parameter adjustment data is returned by the NE E to the adjustment start node NE A through the EDA and the ECDA. The relevant nodes perform light attenuation adjustment according to the parameter adjustment data in the dimming attenuation unit of the corresponding network unit, so that the optical power of the monitoring node NE E satisfies the monitoring threshold requirement.

 Embodiment 4:

 FIG. 6 is a schematic structural diagram of a system for maintaining a wavelength path according to Embodiment 4 of the present invention. Referring to FIG. 6, in this embodiment, NE A is a source network element, NE E is a destination network element, and WG is a network management, and the optical power is assumed to be the only physical signal impairment parameter considered in the embodiment of the present invention, and VOA is the only consideration. A unit that adjusts the physical signal impairment parameters.

 If there are two connection paths from NE A to NE E, namely ADE and ADCE, and the set monitoring node is NE D, the monitoring threshold requires the received signal optical power to exceed -16dbm, and set NE A as the adjustment start node. . When the parameter value monitored by the monitoring node NE D is equal to or smaller than -16 dbm, for example, the ADE optical power and the ADCE optical power are both -17 dbm monitored by the NE D at a certain time. In order to reach the monitoring threshold, the monitoring node NE D may have 2 One is to automatically notify the adjustment start node NE A to start the parameter adjustment maintenance; the second is to report this information to the WG network management to inform the user, the user determines whether to start the parameter adjustment maintenance, if the user does not require parameter adjustment maintenance, Unless the monitoring node detects that the information has reached the monitoring threshold, the event will always exist on the user interface. If the user requests parameter adjustment maintenance, the monitoring node NE D notifies the adjustment start node NE A to start the maintenance of the parameter adjustment.

The adjustment start node NE A sends the RS VP-TE Path information to the monitoring node NE D, and the signaling message collects the physical signal damage parameter and the adjustable physical signal damage range parameter corresponding to each node of the two connections along the ADE and the ADCE, respectively. The information, the monitoring node NE D receives the updated signaling message and reports it to the WG network management system, and the WG network management receives the update information and calculates the parameter adjustment data: adjusts the optical power of the corresponding ADE by adjusting the light attenuation 1 db of the NE D 1 db, by adjusting the light attenuation ldb of NE A, the optical power of the corresponding ADCE is increased by ldb. In practical applications, it can also pass Adjust the optical attenuation of NE A or NE D or two network elements, so that the optical power value received by NE D can reach the optical power threshold required by NE D.

 After the WG network management is completed, the WG network management has two options: First, the instruction including the parameter adjustment data is directly sent to the corresponding network unit, such as NE A and NE D; Second, the parameter adjustment data is sent to the user. The user can judge whether to receive, and the user can also actively correct the parameter adjustment data, and finally return the parameter adjustment data confirmed by the user to the WG network management, and then the WG network management sends the instruction including the parameter adjustment data to the corresponding network. unit. The relevant nodes perform light attenuation adjustment according to the parameter adjustment data in the dimming attenuation unit of the corresponding network unit, so that the optical power of the monitoring node NE D satisfies the monitoring threshold requirement.

 Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary hardware platform, and of course, all can be implemented by hardware, but in many cases, the former is better. Implementation. Based on such understanding, all or part of the technical solution of the present invention contributing to the background art may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM, a magnetic disk, an optical disk, or the like. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

 The above description is only for the specific embodiments of the present invention, and is not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are within the scope of the present invention, should be included in the scope of the present invention. Inside.

Claims

Claim A method of establishing a wavelength path, the method comprising:  The source node calculates an optional route from itself to the destination node, and selects one route as the current route to send a signaling message;  Each node through which the signaling message passes updates the signaling message by its physical signal impairment parameter information and the adjustable physical signal impairment range parameter information;  After updating the received signaling message, the destination node determines, according to the physical signal impairment parameter included in the signaling message, whether the received signaling message signal quality meets a preset target node signal quality threshold, if the result is determined. If yes, the current routing node establishes a wavelength path according to the current route. Otherwise, it is further determined whether the physical signal impairment parameter is adjusted within a range of the adjustable physical signal damage of the received signaling message, so that the signal quality satisfies the purpose. The node signal quality threshold value, if the determination result is yes, notifying the current routing nodes to perform physical signal impairment parameter adjustment, and then the current routing nodes establish a wavelength path according to the current route.  2. The method of establishing a wavelength path according to claim 1, wherein the physical signal impairment parameter comprises: an optical power magnitude, a polarization mode dispersion PMD, a dispersion, an amplifier spontaneous emission ASE, or a signal to noise ratio of the optical path or more. Any combination of any.  3. The method of establishing a wavelength path according to claim 1, wherein the method further comprises:  The current routing node performs resource reservation before establishing a wavelength path according to the current route, and then establishes a wavelength path according to the current route according to the reserved resource.  4. The method of establishing a wavelength path according to claim 1, wherein the method further comprises:  When the current routing node updates the signaling message by its physical signal impairment parameter and the adjustable physical signal impairment range parameter information, the node resource is reserved at the same time; The signal quality of the signaling message received by the destination node meets a preset target node signal quality threshold When the value is adjusted, or the physical signal impairment parameter is adjusted within the range of the adjustable physical signal, so that the signal quality meets the target node signal quality threshold, the destination node notifies the current routing node to perform physical signal impairment parameter adjustment. Sending a resource reservation success message to the source node, and then the current route node establishes a wavelength path according to the current route according to the reserved resource; otherwise, the destination node sends an advertisement message to the source node, to Release the reserved resources of each node of the current route.  The method for establishing a wavelength path according to claim 1, wherein the step of adjusting the physical signal impairment parameter by the current routing node includes:  And the destination node sends a resource reservation message after the adjustment of the physical signal impairment parameter is performed in the range of the tunable physical signal of each node of the current route according to the preset policy, where the resource reservation message includes Calculating a good physical signal impairment parameter adjustment amount and node information corresponding to the calculated physical signal impairment parameter adjustment amount;  The current routing node adjusts the physical signal impairment parameter, reserves resources, and sends a resource reservation message after adjusting the physical signal impairment parameter until the resource reservation message is along a path opposite to the current route. Return to the source node.  The method of establishing a wavelength path according to any one of claims 1 to 5, wherein the method further comprises:  And the destination node sends a resource reservation message after the adjustment of the physical signal impairment parameter is performed in the tunable physical signal damage range of each node of the current route according to the preset policy, where the resource reservation message is further The wavelength path re-authentication information is included, and the resource reservation message is returned to the source node along a path opposite to the current route, and the source node receives a resource reservation message according to a wavelength path included in the resource reservation message. Verifying information, sending a signaling message, and each node passing through the signaling message updates the signaling message by using its physical signal impairment parameter information and the adjustable physical signal impairment range parameter information; After updating the received signaling message, the destination node determines, according to the physical signal impairment parameter included in the signaling message, whether the received signaling message signal quality meets a preset target node signal quality threshold, and is current Each node of the route establishes a wavelength path according to the current route. 7. The method of establishing a wavelength path according to claim 1, wherein the method further comprises: if the physical signal impairment parameter is adjusted within a range of the tunable physical signal of the received signaling message, the signal quality cannot be satisfied. And sending, by the source node, an advertisement message to the source node, to notify the source node to select another route from the optional route as the current route.  The method for establishing a wavelength path according to claim 1, wherein the method further comprises: the intermediate node determining, according to the physical signal impairment parameter included in the signaling message, whether the quality of the received signaling message signal satisfies pre-storage The target node signal quality threshold value, if the judgment result is yes, sending a signaling message to the next node, otherwise further determining whether to adjust the physical signal by the adjustable physical signal damage range of the received signaling message The damage parameter is such that the signal quality satisfies the target node signal quality threshold. If the judgment result is yes, the signaling message is sent to the next node.  9. The method of establishing a wavelength path according to claim 8, further comprising: if the physical signal impairment parameter is adjusted within a range of the tunable physical signal of the received signaling message, the signal quality cannot satisfy the purpose The node signal quality threshold is sent to the source node to notify the source node to select another route from the optional route as the current route.  A node device, comprising: a receiving module, a sending module, a determining module, a processing module, and a routing module, wherein  The receiving module is configured to receive a message and send the message to the determining module.  The determining module is configured to receive a message sent by the receiving module, and determine whether the message is a resource reservation message or an advertisement message, and if the message is a resource reservation message, send the resource reservation message to the a processing module, if the message is an advertisement message, sending the advertisement message to the routing module; The processing module is configured to receive the resource reservation message sent by the determining module, and if the resource reservation message includes a calculated physical signal impairment parameter adjustment amount, according to the calculated physical signal impairment parameter The adjustment amount is used to adjust the physical signal impairment parameter, and the resource is reserved; if the resource reservation message does not include the calculated physical signal impairment parameter adjustment amount information, the resource is reserved, and the physical component including the node device itself is sent to the sending module. Signal damage parameter, adjustable physical signal damage range Signaling message of parameters and routing information;  The routing module is configured to receive the advertisement message sent by the determining module, select a route from the optional route as the current route, and send the calculated routing information to the processing module; And receiving the signaling message sent by the processing module, and sending the signaling message.  A node device, comprising: a receiving module, a processing module, a determining module, and a sending module, where  The receiving module is configured to receive a signaling message and send the message to the processing module.  The processing module is configured to receive the signaling message sent by the receiving module, update the signaling message by using a physical signal impairment parameter of the node device and an adjustable physical signal damage range parameter, and send the updated signaling message to The determining module;  The determining module is configured to receive the updated signaling message from the processing module, and determine whether the quality of the message signal meets a preset signal quality threshold according to a physical signal impairment parameter included in the signaling message. If the judgment result is yes, the resource reservation message is sent to the sending module, otherwise it is further determined whether the physical signal damage parameter is adjusted within the range of the adjustable physical signal damage of the received signaling message, so that the signal quality satisfies the signal. a quality threshold, if the determination result is yes, sending a resource reservation message to the sending module, where the resource reservation message includes the calculated physical signal damage parameter adjustment amount and the calculated physical signal damage parameter Corresponding node information, otherwise, sending an announcement message to the sending module;  The sending module is configured to send the resource reservation message or the notification message.  12. A system for establishing a wavelength path, the system comprising: a source node and a destination node, wherein The source node is configured to determine an optional route from the self to the destination node, and select a route as the current route, and send a signaling message, where each node that the signaling message passes through its physical signal damage parameter information And adjusting the physical signal damage range parameter information to update the signaling message; receiving the message, if the message includes the calculated physical signal damage parameter adjustment amount information, performing physical signal damage Parameter adjustment, resource reservation; if the message does not include the calculated physical signal impairment parameter adjustment amount information, resource reservation;  The destination node is configured to receive a message, update the signaling message by using the physical signal impairment parameter and the tunable physical signal damage range parameter information, and after updating the received signaling message, according to the physics included in the signaling message The signal impairment parameter determines whether the received signaling message signal quality meets a preset target node signal quality threshold. If the determination result is yes, a resource reservation message is sent, and each node of the current route establishes a wavelength path according to the current route. Otherwise, it is further determined whether the signal quality meets the target node signal quality threshold by adjusting the physical signal impairment parameter within the adjustable physical signal damage range, and if the determination result is yes, the resource reservation message is sent, including the calculated physical The signal impairment parameter adjustment quantity information is used to notify each node of the current route to perform physical signal impairment parameter adjustment, and then each node of the current route establishes a wavelength path according to the current route.  13. The system for establishing a wavelength path according to claim 12, wherein said system further comprises an intermediate node,  An intermediate node, configured to receive a message, if the message is a signaling message, update the signaling message by using its physical signal impairment parameter and the adjustable physical signal impairment range parameter, and send the updated signaling message to the next node; The message is a resource reservation message, and determines whether the resource reservation message includes the calculated physical signal impairment parameter adjustment amount information, and if the resource reservation message includes the calculated physical signal damage parameter adjustment amount information, performing physical signal damage parameter adjustment. And the resource reserves and forwards the resource reservation message. If the resource reservation message does not include the calculated physical signal impairment parameter adjustment amount information, the resource reservation is performed and the resource reservation message is forwarded.  14. A method of maintaining a wavelength path, the maintenance method comprising:  When the monitoring node detects that the parameter is equal to or lower than a preset monitoring node signal quality threshold, the monitoring node notifies the adjustment start node to start parameter adjustment;  After receiving the notification, the adjustment start node sends a signaling message to the monitoring node; Each node that passes the signaling message updates the signaling message by its physical signal damage parameter information and the adjustable physical signal damage range parameter information; After receiving the update signaling message, the calculating unit calculates the parameter adjustment data according to the physical signal impairment parameter and the adjustable physical signal damage range parameter information included in the signaling message;  Each node between the monitoring node and the adjustment start node adjusts parameters according to the parameter adjustment data.  The method for maintaining a wavelength path according to claim 14, wherein the calculating unit is a monitoring node, and the monitoring node sends a signaling message including parameter adjustment data to the adjustment start node, where the monitoring node and Each node between the adjustment start nodes receives parameter adjustment data.  The method for maintaining a wavelength path according to claim 14, wherein the calculating unit is a centralized computing unit that receives data reported by the monitoring node.  17. The method of maintaining a wavelength path according to claim 16, wherein the centralized computing unit is a network management.  18. The method of maintaining a wavelength path according to claim 16, wherein each node between the monitoring node and the adjustment start node receives parameter adjustment data by adjusting the parameter by the centralized calculation unit. Data is distributed to the nodes.  The method for maintaining a wavelength path according to claim 14, wherein the monitoring node notifying the adjustment start node to start parameter adjustment is specifically:  The monitoring node directly sends an announcement information to the adjustment start node; or  The monitoring node sends an announcement to the user, and the user sends an announcement message to the adjustment start node.  20. The method of maintaining a wavelength path according to claim 14, wherein the method further comprises:  After the calculation unit calculates the parameter adjustment data, the parameter adjustment data calculated by the calculation unit is corrected according to a user setting.  A node device, comprising: a receiving module, configured to receive a message, where the message includes parameter adjustment information or a signaling message; a processing module, configured to receive a message sent by the receiving module, and if it is parameter adjustment information, enter Performing physical signal impairment parameter adjustment; if it is a signaling message, updating the signaling message by the physical signal impairment parameter of the node device itself and the adjustable physical signal impairment range parameter, according to the physical signal included in the updated signaling message The damage parameter is judged to determine whether the quality of the message signal meets a preset signal quality threshold. If the judgment result is yes, the updated signaling message is sent; otherwise, the notification message is sent;  And a sending module, configured to receive the signaling message processed by the processing module, and send an updated signaling message according to the determination result of the processing module, if the determination result is yes; otherwise, send the notification message.  The node device according to claim 21, wherein the processing module further comprises:  And a calculation module, configured to calculate parameter adjustment data according to the updated signaling message, and send a signaling message including the parameter adjustment data to the sending module.  A node device, comprising: a receiving module, a sending module, a determining module, a processing module, and a routing module, wherein  a receiving module, configured to receive a message, and send the message to the determining module;  a judging module, configured to receive a message sent by the receiving module, and determine whether the message is a parameter adjustment message or an advertisement message, if the message is a parameter adjustment message, sent to a processing module, if the message is an advertisement message, send To the routing module;  a processing module, configured to receive a message sent by the determining module, and perform physical signal impairment parameter adjustment according to the calculated physical signal damage parameter adjustment amount included in the message;  a routing module, configured to receive a message sent by the determining module, select a route from the optional connected route as the current route, and send the calculated routing information to the processing module;  The sending module is configured to receive a signaling message sent by the processing module, and send the signaling message. A system for maintaining a wavelength path, the system comprising: a monitoring node and an adjustment starting node, wherein The monitoring node is configured to receive a signaling message, and through its physical signal damage parameter and an adjustable object The signal impairment range parameter information is updated to the signaling message, and according to the physical signal impairment parameter included in the updated signaling message, it is determined whether the received signaling message signal quality satisfies the monitoring node signal quality threshold, and if the determination result is If yes, the updated signaling message is sent, otherwise, an notification message is sent to the adjustment start node, and the adjustment start node is notified to start maintenance of parameter adjustment; the adjustment start node is configured to receive the monitoring node. The notification information sent, the parameter adjustment maintenance, and the sending of the signaling message; the signaling message includes its own physical signal impairment parameter information and the adjustable physical signal damage range parameter information.  25. The system for maintaining a wavelength path according to claim 24, wherein the monitoring node and the adjustment start node perform physical signal impairment parameter adjustment according to the received parameter adjustment data.  26. The system for maintaining a wavelength path according to claim 24, wherein said system further comprises an intermediate node,  The intermediate node is configured to receive the signaling message sent by the previous node, update the signaling message by using its physical signal impairment parameter and the adjustable physical signal impairment range parameter, and send the updated signaling message to the next node.