WO2011003245A1

WO2011003245A1 - Extra traffic load processing method and apparatus in optical transmission network

Info

Publication number: WO2011003245A1
Application number: PCT/CN2009/073572
Authority: WO
Inventors: 温建中; 吴青
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-07-06
Filing date: 2009-08-27
Publication date: 2011-01-13
Also published as: CN101944950A; CN101944950B

Abstract

An extra traffic load processing method and apparatus in Optical Transmission Network (OTN), which are applied to an intermediate node of a protection path, are provided in the invention. The method includes: detecting Automatic Protection Switch (APS) protection protocol information of the protection path; if the APS protection protocol information indicates that the current state of the protection path is switching from switch state or bridging state to no request state, disconnecting the pass-through connection of the intermediate node, and/or, loading the extra traffic at the intermediate node. According to technical solutions provided in the invention, the extra traffic can be loaded at the intermediate node of the OTN linear protection path, and the use limitation of the extra traffic is reduced.

Description

Additional service loading processing method and device in optical transport network

The present invention relates to the field of communications technologies, and in particular, to an additional service loading processing method and apparatus in an optical transport network in the field of communications. BACKGROUND OF THE INVENTION An optical transmission network (OTN) is a transmission network that is based on a wavelength division multiplexing technology and organizes a network in an optical layer, and is a next-generation backbone transmission network. The emergence of OTN-based transport networks will make the desired intelligent optical network gradually become a reality, providing network operators and customers with a new generation of optical transport platforms that are safe, reliable, cost-effective, manageable and operable. In the optical transport network, a linear protection mechanism is proposed based on the ring network protection characteristics of Optical Data Units (ODUk). At present, the linear protection mechanism based on ODUk is given in the standard OTN standard G.873.1. The linear protection modes of 1 + 1 and 1: N are defined in G.873.1, but in the above two protection methods, only linearity is specified. The control method for protecting the switching between the first and the last nodes and the bridging is required. For the intermediate nodes on the linear protection path, the services that are configured to be fixed through are required to be installed, so that the intermediate nodes of the protection path cannot load additional services, and only the additional services can be loaded at the beginning and end of the protection path. There are certain restrictions on the use of additional services. SUMMARY OF THE INVENTION The present invention has been made in view of the problem in the related art that it is impossible to load additional services in an intermediate node of an OTN linear protection path, thereby limiting the use of additional services. To this end, the main object of the present invention is to provide an improved An additional service loading method and apparatus in the optical transport network to solve at least one of the above problems. According to an aspect of the present invention, an additional service loading processing method in an optical transport network is provided. An additional service loading processing method in an optical transport network according to the present invention is applied to an intermediate node in a protection path, the method comprising: detecting an automatic protection switching APS protection protocol information of the protection path; If the APS protection protocol information indicates that the current state of the protection path is changed from the switched state or the bridged state to the unrequested state, the through-connection of the intermediate node is disconnected, and/or the additional traffic is loaded at the intermediate node. According to another aspect of the present invention, an additional traffic loading processing apparatus in an optical transport network is provided. The additional service loading processing apparatus in the optical transport network of the present invention includes: a detecting unit and a processing unit, wherein the detecting unit is configured to detect APS protection protocol information of the protection path (the APS protection protocol information includes: information indicating a current state of the protection path) And a processing unit, configured to: when the APS protection protocol information indicates that the current state of the protection path is changed from a switching state or a bridge state to a no-request state, disconnect the intermediate node, and/or load the intermediate node business. The present invention provides an additional service loading scheme in an optical transport network, and detects information about the current state transition of the protection path included in the Automatic Protection Switched (APS) protection protocol information of the protection path; The information indicates that the current state of the protection path is changed from the switched state or the bridged state to the unrequested state, the through-connection of the intermediate node is disconnected, and additional services are loaded at the intermediate node. The invention solves the problem that the additional service cannot be loaded on the intermediate node of the OTN linear protection path, so that the use of the extra service is limited, and the additional service can be loaded on the intermediate node of the OTN linear protection path, which is reduced. Restrictions on the use of additional services. Other features and advantages of the invention will be set forth in the description which follows, and The objectives and other advantages of the invention will be realized and attained by the <RTI The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. In the drawings: FIG. 1 is a schematic diagram of a linear protection network based on ODUk granularity according to an embodiment of the present invention; FIG. 2 is a flowchart of an additional service loading processing method in an optical transport network according to an embodiment of the present invention; 3 is a schematic diagram of an intermediate node selecting to access an additional service or performing a protection punch-through connection according to a network state according to an embodiment of the present invention; FIG. 4 is a middle of a protection path in a switching or bridging state according to an embodiment of the present invention; FIG. 5 is a schematic diagram showing a connection state of an intermediate node in a protection path in an unrequested state according to an embodiment of the present invention; FIG. 6 is an additional diagram of an optical transmission network according to an embodiment of the present invention. FIG. 7 is a structural diagram of an additional service loading processing apparatus in an optical transport network according to a preferred embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In view of the problem in the related art that an additional service cannot be loaded on an intermediate node of an OTN linear protection path, thereby limiting the use of additional services, an improved service in the optical transport network is proposed. Loading method and device. In the embodiment of the present invention, a special processing is added to the intermediate pass-through node of the ODUk linear protection, so that the punch-through node can extract the APS protection protocol information and judge the state of the current protection channel, and when the protection channel is found to be in the no-request (idle) state, You can load additional services on the protection path as needed. When the protection channel needs to be occupied by normal services, the extra services are unloaded and the protection channel is set to the punch-through state. The embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The preferred embodiments of the present invention are described in the following with reference to the accompanying drawings, which are intended to illustrate and illustrate the invention. Method Embodiments According to an embodiment of the present invention, an additional service loading processing method in an optical transport network is first provided. The OTN linear protection network is first described below with reference to FIG. 1. FIG. 1 is a schematic diagram of a linear protection network based on ODUk granularity according to an embodiment of the present invention. As shown in Figure 1, the protection is based on the ODUk granularity. The linear protection network consists of two paths: the working path AEFGD and the protection path ABCD, where the working path is used to carry the primary (normal working) service, and the working path cannot carry the current service. In this case, the protection path can be used to carry the services carried by the working path. The above method is a switching method for the sender, and is a bridging method for the receiver. When the protection path is in the unrequested state, additional services can be loaded on it. In order to load additional services on the intermediate nodes of the protection path, it is necessary to add special processing in the intermediate punch-through node, so that the punch-through node can extract the APS protection protocol information and judge the state of the current protection channel, and find that the protection channel is unrequested (idle). In the state, you can load additional services on the protection path as needed. 2 is a flow chart of an additional service loading processing method in an optical transport network according to an embodiment of the present invention. As shown in FIG. 2, the additional service loading method in the optical transport network of the embodiment of the present invention mainly includes the following processing (step S201 - step S203): Step S201: detecting APS protection protocol information of the protection path; wherein, the APS protection protocol information includes : Information indicating the current status of the protection path. Step S203: If the information indicates that the current state of the protection path is changed from the switching state or the bridge state to the no-request state, the through-connection of the intermediate node is disconnected, and/or the additional service is loaded at the intermediate node. Preferably, the foregoing APS protection protocol information is composed of APS bytes. When detecting the APS bytes in the ODUk channel participating in the protection, the APS byte is indicated to be converted by other states (ie, switching occurs at the head and tail nodes or bridging related actions). When there is no request status, there are two ways to deal with it:

(1) If the node is configured with additional services, it sends a command (message) to the service cross-connect unit of the node, disconnects the protection punch-through connection of the node, and connects the extra service to the protected ODUk channel. (2) If the node does not configure additional services, it only disconnects the protection punch-through connection of the node by sending an instruction (message) to the service cross-connect unit of the node. Preferably, if the information indicates that the current state of the protection path is changed from the unrequested state to the switching or bridging state, the intermediate node is set to the punch-through state. If additional services are previously loaded, the additional business is offloaded. If the current status of the protection path is changed from the unrequested state to the switching or bridging state, it indicates that the current protection path needs to carry the normal working service, and the previously loaded additional service needs to be uninstalled, and the protection path is set to the punch-through state. To carry normal business operations. Preferably, after the additional service is loaded, the message needs to be sent to the overhead cross module of the intermediate node, where the message carries information indicating the APS overhead byte channel of the intermediate node. The overhead and the service are in one frame during the transmission process. Because of the jib, after the extra service is loaded, since the protection punch-through connection of the node is disconnected, in order to maintain the overhead connection of the protection path, the APS overhead byte channel needs to be punched through. Through the foregoing embodiments, an additional service loading processing method in an optical transport network is provided. The method can enhance the flexibility of using ODUk linear protection in an OTN network, so that the additional services are not limited to being configured between the first and last nodes. , reducing the restrictions on using additional services. Example If there is an OTN linear protection network as shown in Figure 1, the protection is based on the ODUk granularity, where the working path is AEFGD and the protection path is ABCD. According to OTN protection standard G.873.1, only the first and last nodes A and D perform switching and bridging, and whether to send additional services and other decisions. Additional services can be configured between B and C through the additional service loading processing scheme provided by the embodiment of the present invention. For example, it is necessary to access additional services at point B. As shown in FIG. 3, the node B can select to access additional services according to the network status (that is, disconnect the eastbound ODUk and the westbound ODUk of the node B, and access the additional services. Or perform a protective punch-through connection (ie, the connection between the eastbound ODUk and the westward ODUk of node B). According to the technical solution provided by the example of the present invention, the following processing is performed at the intermediate node B of the protection path:

(1) Detect the APS bytes in the eastward ODUk and the westward ODUk node. If the current state is changed from the non-switching (no request) state to the switching state, execute (2), if the current state is changed from the switching state to the Switching state (no request state), then executing (3);

(2) Send instructions to the service cross-unit of the node to implement the protection punch-through connection between the east ODUk and the west ODUk. See Figure 4. 4 is a schematic diagram showing a connection state of an intermediate node B in a protection path in a switched or bridged state according to an embodiment of the present invention. The protection path needs to carry normal working services, so To uninstall the extra service, that is, disconnect the extra service; and pass through the protection connection, that is, through the east

ODUk and westbound ODUk connection.

(3) Send an instruction to the service cross-unit of the node to connect the extra service to the east ODUk. See Figure 5. (4) Send an instruction to the overhead cross module of the node to cross the APS bytes of the east ODUk and the west ODUk (that is, through the APS overhead byte channel), as shown in FIG. 5. FIG. 5 is a schematic diagram showing the connection state of the intermediate node B in the protection path in the unrequested state according to the embodiment of the present invention. The protection path does not need to carry normal working services, needs to load additional services, and can connect additional services to the east ODUk. After loading the extra service, it is necessary to send a message to the overhead cross module of the intermediate node, and pass through the APS overhead byte channel of the intermediate node B. Apparatus Embodiments According to an embodiment of the present invention, an additional service loading processing apparatus in an optical transport network is also provided. FIG. 6 is a structural block diagram of an additional service loading processing apparatus in an optical transport network according to an embodiment of the present invention. FIG. 7 is a structural block diagram of an additional service loading processing apparatus in an optical transport network in accordance with a preferred embodiment of the present invention. As shown in FIG. 6, an additional service loading device in an optical transport network according to an embodiment of the present invention includes: a detecting unit 1 and a processing unit 2. The detecting unit 1 is configured to detect APS protection protocol information of the protection path, where the APS protection protocol information includes: information indicating a current status of the protection path; and the processing unit 2 is connected to the detection unit 1 for indicating the protection path in the information In the case where the current state is switched from the switched state or the bridged state to the unrequested state, the punch-through connection of the intermediate node is disconnected, and additional traffic is loaded at the intermediate node. Preferably, as shown in FIG. 7, the processing unit 2 may further include: a decision module 20, an overhead cross module 22, and a loading module 24, where the decision module 20 is configured to determine the disconnection middle according to the information indicating the current state of the protection path. a connection of the node; an overhead cross module 22 for disconnecting the intermediate node; and a loading module 24 for loading additional services at the intermediate node. Preferably, the determining module 20 is further configured to determine, according to the information indicating the current state of the protection path, whether to bypass the connection of the intermediate node; the cost cross module 22 is further configured to punch through the intermediate node. The processing unit 2 may further include: an unloading module 26 for offloading additional services at the intermediate node. Preferably, the overhead cross module 22 is further configured to punch through the APS overhead byte channel. Through the above embodiments, an additional service loading processing apparatus in an optical transport network is provided. The extra services on the ODUk protection path can be loaded on any intermediate node without affecting the function of the ODUk protection itself. In summary, with the above embodiment of the present invention, special processing is added to the intermediate punch-through node of the ODUk linear protection, so that the punch-through node can extract the APS protection protocol information and judge the state of the current protection channel, and find that the protection channel is idle. In the state, additional services can be loaded on the protection path as needed, so that additional services on the ODUk protection path can be loaded on any intermediate node, which does not affect the function of the ODUk protection itself, and enhances the ODUk based on the ODUk. The flexibility of linear protection. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

An additional service loading processing method in an optical transport network, which is applied to an intermediate node in a protection path, wherein the method includes:

Detecting automatic protection switching APS protection protocol information of the protection path; if the APS protection protocol information indicates that the current status of the protection path is changed from a switching state or a bridge state to an unrequested state, disconnecting the intermediate node Connecting, and/or, loading additional services at the intermediate node.

The method according to claim 1, wherein the APS protection protocol information comprises: information indicating a current state of the protection path.

3. The method of claim 1 wherein disconnecting the intermediate node from the punch-through connection comprises:

Transmitting, to the service cross-unit of the intermediate node, a first message, where the first message carries information indicating that the punch-through connection of the intermediate node is disconnected;

The service cross-unit disconnects the punch-through connection of the intermediate node according to the indication of the information carried in the first message.

The method according to claim 1 or 2, wherein the method further comprises:

And if the APS protection protocol information indicates that the current status of the protection path is changed from a no-request state to a switching or bridging state, setting the intermediate node to a punch-through state, and/or unloading additional services at the intermediate node.

The method according to claim 1 or 2, wherein after loading the additional service, the method further comprises:

Sending a second message to the overhead cross-module of the intermediate node, where the second message carries information indicating an APS overhead byte channel that passes through the intermediate node;

The overhead cross module bypasses the APS overhead byte channel according to the indication of the information carried in the second message.

An additional service loading and processing device in an optical transport network, comprising: a detecting unit, configured to detect APS protection protocol information of the protection path; wherein, the APS protection protocol information includes: indicating the protection The information about the current state of the path; the processing unit, configured to: when the APS protection protocol information indicates that the current state of the protection path is changed from a switching state or a bridge state to a no-request state, disconnecting the through-connection of the intermediate node And/or, loading additional services at the intermediate node.

The device according to claim 6, wherein the processing unit comprises:

a decision module, configured to determine, according to the information indicating the current state of the protection path, whether to disconnect the intermediate node;

An overhead cross module for disconnecting the intermediate node and loading additional services at the intermediate node.

8. Apparatus according to claim 7 wherein:

The decision module is further configured to determine whether to bypass the connection of the intermediate node according to the information indicating the current state of the protection path;

The overhead cross module is further configured to punch through the connection of the intermediate node and uninstall the additional service at the intermediate node.

9. Apparatus according to claim 7 or claim 8 wherein:

The overhead cross module is further configured to punch through the APS overhead byte channel.