Method for constructing private network and realizing intelligent management and control in multi-domain OTN (Optical Transport Network)

Abstract

The invention relates to the technical field of optical transport networks, in particular to a method for constructing a private network and realizing intelligent management and control in a multi-domain OTN (Optical Transport Network), which comprises the following steps of: constructing a wide-area private OTN based on customized small private OTN equipment in combination with an operator OTN; on the basis of an independently developed OTN private network management system and a multi-channel intelligent management and control module embedded in the special OTN equipment, the special OTN network is subjected to global management and control. The method can support whole-course end-to-end service scheduling and whole-course protection recovery functions which cannot be realized by a traditional cross-operator OTN special line, has higher service isolation capability and safety compared with a virtual private network based on a network layer, builds a wide-area private OTN network with lower cost, and has a wide-area application prospect. And the requirements of global management and control, efficient service scheduling, whole-process service automatic protection and the like are met.

Description

Technical Field

[0001] The present invention relates to the technical field of optical transport networks, and in particular to a method for building a private network and realizing intelligent management and control in a multi-domain OTN network. Background Art

[0002] At present, the fixed optical network backbone is mainly built by telecom operators based on the OTN (optical transport network) system, using OTN equipment from different manufacturers and adopting a multi-domain networking method to build an OTN network throughout the country to provide communication services covering the whole country. In addition to the public network built by operators, large organizations or enterprises such as government, military, railways, and electricity also build their own private networks. In addition to building private networks at the network layer, some organizations also have the need to build a dedicated optical transmission network covering the whole country. These dedicated optical transmission networks rent a large number of operators' OTN dedicated lines to complete the construction of the dedicated network. The dedicated line services are managed and controlled by the operators. The dedicated optical network thus formed has the following problems:

[0003] A dedicated network composed of multiple operators' dedicated lines across multiple manufacturers' equipment domains relies on different operators to establish services in segments in different manufacturers' equipment domains during the service establishment process. This makes it impossible to achieve fast end-to-end service scheduling and the service scheduling efficiency is low. When a failure occurs in the segmented service, the service protection switching function can only be provided when a failure occurs in the same manufacturer's domain, and automatic protection of the entire service cannot be achieved. The dedicated lines belong to different operators and different manufacturers' equipment networks, and it is difficult for management and control information to be intercommunication, resulting in the inability to independently perform intelligent management and control of the entire network. Summary of the invention

[0004] The purpose of the present invention is to provide a method for constructing a private network and realizing intelligent management and control in a multi-domain OTN network, aiming to solve the problem that a network composed of segmented private lines is difficult to realize autonomous management and control, and cannot realize rapid scheduling and protection recovery of the entire service.

[0005] To achieve the above object, the present invention provides a method for building a private network and realizing intelligent management and control in a multi-domain OTN network, comprising the following steps:

[0006] Build a wide-area dedicated OTN network based on customized small-scale dedicated OTN equipment combined with the operator's OTN network;

[0007] Based on the independently developed OTN private network management system and the multi-channel intelligent management and control module embedded in the dedicated OTN equipment, the dedicated OTN network is fully managed.

[0008] The dedicated OTN equipment is configured with OTU-1 and OTU-2 line interfaces according to the bandwidth requirements of the private network, and can be upgraded to higher capacity interfaces according to demand. The number of interfaces is configured according to the number of different OTN domains connected.

[0009] Among them, the dedicated OTN equipment can flexibly select OTN internal overhead (GCC overhead), VC12 channel / 2M interface, serial interface and Ethernet interface as network management channels, support in-band and out-of-band transmission modes, and realize unified management and control of dedicated OTN equipment across operator network domains.

[0010] Among them, the dedicated OTN equipment and the operator's dedicated line business resources are included in unified management and control to achieve end-to-end rapid scheduling of cross-domain services, and re-routing recovery when the service fails. It has independent operation, management and maintenance capabilities. After the wide-area dedicated OTN network is built, it can independently perform end-to-end service scheduling and service protection and recovery without conflicting with other services of the operator.

[0011] The operator network through which the service passes needs to reserve bandwidth resources, and the dedicated OTN equipment is placed at the boundary of each operator network domain through which the service passes, so as to perform more fine-grained bandwidth service scheduling.

[0012] The present invention discloses a method for constructing a private network and realizing intelligent management and control in a multi-domain OTN network. The method constructs a wide-area private OTN network based on a customized small-scale private OTN device combined with an operator OTN network. The method performs global management and control on the private OTN network based on an independently developed OTN private network management system and a multi-channel intelligent management and control module embedded in the private OTN device. The method realizes end-to-end intelligent service scheduling and fault recovery based on a proprietary routing calculation method, and meets the requirements of efficient service scheduling and highly reliable transmission. The method can support the full-process end-to-end service scheduling and full-process service protection and recovery capabilities that cannot be achieved by traditional cross-operator OTN private lines. Compared with a virtual private network based on a network layer, the method has higher service isolation capability and security. The method constructs a wide-area private OTN network at a relatively low cost, realizes independent management and control of the private network, and meets the requirements of global controllability, efficient service scheduling, and automatic protection of the full-process service. The method solves the problem that a network composed of segmented private lines is difficult to realize independent management and control, and cannot realize rapid scheduling and protection and recovery of the full-process service. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a configuration diagram for building a private network and realizing an intelligent management and control system in the network.

[0015] Figure 2It is a schematic diagram of the architecture and working principle of building a private network and realizing intelligent management and control system in the network.

[0016] Figure 3 It is a flow chart of a method for building a private network and realizing intelligent management and control in a multi-domain OTN network provided by the present invention.

[0017] Figure 4 This is an example diagram of the network construction method of the present invention.

[0018] Figure 5 This is an example diagram of the network management information transmission method of the present invention.

[0019] Figure 6 It is a schematic diagram of the multi-channel intelligent management and control module of the present invention.

[0020] Figure 7 This is an example diagram of the service scheduling path calculation topology of the present invention. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0022] See also Figures 1 to 7 The present invention provides a method for building a private network and realizing intelligent management and control in a multi-domain OTN network, comprising the following steps:

[0023] S1 builds a wide-area dedicated OTN network based on customized small-scale dedicated OTN equipment combined with the operator's OTN network;

[0024] In the embodiment of the present invention, the dedicated OTN equipment is placed between different OTN domains (between OTN networks of different manufacturers or OTN networks of different operators) and at the end of service access. The dedicated OTN equipment can be configured with OTU-1 and OTU-2 line interfaces according to the bandwidth requirements of the dedicated network, and can be upgraded to higher capacity interfaces according to the requirements. The number of interfaces is configured according to the number of different OTN domains connected. The service interface is configured according to the type and number of service interfaces of this site. The dedicated OTN equipment realizes the management of dedicated OTN equipment across networks of different manufacturers through proprietary network management technology, and realizes end-to-end circuit scheduling and protection through centralized calculation and management of the OTN private network management system. The dedicated OTN equipment supports both OTN and SDH cross-matrices, so the cross-granularity can be ODU level or VC level. The dedicated OTN equipment adopts proprietary intelligent multi-channel control information processing technology, and can flexibly select OTN internal GCC overhead, 2M interface, serial interface, and Ethernet interface as network management channels, support in-band and out-of-band transmission modes, and realize unified control of dedicated OTN equipment across operator network domains.

[0025] This wide-area private OTN network can support end-to-end service scheduling and full protection and recovery capabilities that traditional OTN dedicated lines cannot achieve. Compared with network-layer-based virtual private networks, it has higher service isolation capabilities and security.

[0026] S2 performs global management and control of the dedicated OTN network based on the independently developed OTN private network management system and the multi-channel intelligent management and control module embedded in the dedicated OTN equipment.

[0027] In the embodiment of the present invention, the OTN private network management system realizes unified management of the OTN private network across networks of different manufacturers. The configuration of dedicated OTN equipment at each domain boundary through which the service passes is the main feature of this solution and the basis for realizing automatic scheduling and protection and recovery of the entire service.

[0028] Network construction method

[0029] The way to construct the network topology is to first build the topology of the dedicated OTN network according to the business and bandwidth requirements, and then apply for OTN dedicated lines from the operator according to the topology connection and bandwidth requirements to complete the construction and interconnection of the entire network topology. The applied OTN dedicated line should be able to achieve OTN overhead transparent transmission to achieve the traversal of management information, but because the wide area network may involve different operators and manufacturers of equipment, some dedicated lines may not be able to achieve overhead transparent transmission. At this time, the dedicated OTN equipment needs to adopt other methods to transmit management information. For specific solutions, please refer to the section on management and control information processing in this article. For examples of network connection methods, see Figure 4. According to the service bandwidth requirements of the dedicated OTN network, some inter-domain link resources (OTU-1, OTU-2 or higher rate) are separated from the operator's inter-domain link interface, and the link is used to connect the dedicated OTN equipment to the operator's network. (To simplify the drawing, the inter-domain links in the figure only show the links connected to the dedicated OTN equipment, and do not show the inter-domain interconnection links used by the operator itself). Dedicated OTN equipment is configured at each domain boundary through which the service passes to ensure arbitrary access and flexible scheduling capabilities for the entire network service.

[0030] To achieve flexible service access and scheduling, dedicated OTN equipment supports ODU-level cross-connection (ODU1, ODU2) and VC-level cross-connection (VC4, VC12). High-speed interfaces (including OTU-1, OTU-2OTN interfaces, STM-1 / 4 / 16SDH interfaces, 10 / 100 / 1000M Ethernet interfaces, etc.) and low-speed 2M service interfaces can be configured according to service access and scheduling requirements. Each dedicated OTN device can be used as a service access or add / drop node, or a cross-connection node, such as Figure 4 The two dotted lines in the figure represent the service channel from node ② to node ③ via node ⑤, and the service channel from node ① to node ⑦ via node ⑤ and node ④. Other services can also be established between any nodes according to demand to meet different types of service access and intelligent scheduling requirements.

[0031] Control plan

[0032] To build an OTN private network and realize intelligent management and control in the existing operator network, it is necessary to solve the problem of transmitting network management information across different operator networks and realize unified management of dedicated OTN equipment distributed between various sections. The OSC (optical monitoring channel) network management channel of the existing OTN network is generally used internally by each operator and cannot be used to transmit OTN private network management information. This solution combines three transmission methods to meet the control information transmission needs in different scenarios, such as Figure 5 shown.

[0033] When the operator can provide transparent OTU dedicated lines, use OTN's GCC overhead to transmit control information; when GCC overhead cannot be transparently transmitted and no external DCN (data communication network) network is available, the control information can be embedded in the VC12 (2M) service channel for transmission; when the external DCN network is available, consider using the DCN channel (based on Ethernet interface or serial interface) for transmission.

[0034] In order to support the above control information transmission methods, a multi-channel intelligent control module is embedded in the dedicated OTN equipment. The module supports both in-band and out-of-band control information processing, and can use GCC overhead, VC12 (2M) signal, serial signal, and Ethernet as network management channels at the same time. Different network management channels can back up each other to improve reliability; the multi-channel intelligent control module is integrated inside the equipment, and can directly extract the GCC overhead and VC12 (2M) channel in the transmission link as the network management channel; the network management channel has the functions of aggregation and sharing, so that different dedicated OTN equipment can share the same network management channel.

[0035] The principle of the multi-channel intelligent control module is as follows Figure 6 As shown in the figure, the module is developed based on the programmable logic device inside the device and has a built-in multi-port routing function. The multi-channel adapter module can process the control messages from GCC overhead, VC12 and DCN transmission. The interfaces protect each other and can switch to the protection channel when a channel fails to ensure the smooth flow of control information.

[0036] When VC12 is used to transmit control information, the VC12 channel switching may be interrupted due to service scheduling. It is necessary to ensure that the VC12 channel used to transmit control information is not used to transmit service information and does not participate in service scheduling.

[0037] In order to achieve end-to-end service scheduling and protection recovery, it is necessary to include the operator network domain information, the connection link information of the reserved dedicated line and the dedicated OTN equipment into the OTN private network management system database. Since the operator network pipeline (dedicated line) of the service path is preset, during the service scheduling and recovery process, only the cross matrix of the dedicated OTN equipment needs to be configured.

[0038] In this solution, the network topology consists of operator domains and dedicated OTN equipment deployed between the domains. To achieve end-to-end service scheduling, a proprietary routing calculation method is used. This method combines the link detection mechanism of dedicated OTN equipment and network topology abstraction to complete the path selection process.

[0039] For ease of description, based on the example in this article Figure 4 The topology of the example topology graph used for path calculation is generated (see Figure 7 ). Figure 7 In the paper, each operator network domain is abstracted as an operator node, and the dedicated OTN equipment embedded between the operator domains and the links connecting them to the operators on both sides are abstracted as network-side links (including link ②, link ③, link ④, link ⑤, link ⑥) to achieve network interconnection between abstract nodes. Figure 7 It is assumed that the source and sink nodes for service scheduling are Figure 4 The dedicated OTN devices ① and ⑦ in the diagram are connected to the operator domain through the user-side link ( Figure 7 In the figure, there are link ① and link ⑦).

[0040] Based on the example Figure 7 The business intelligent scheduling steps are as follows:

[0041] In the first step, dedicated OTN equipment enables the link management protocol to detect the interconnection between nodes and eliminate unavailable operator domains (virtual nodes) or unavailable links.

[0042] The second step is to calculate the operator domains (virtual nodes) passed through according to the service source (S) node and the end (D) node (the corresponding virtual nodes in the figure are node A and node D), and determine the operator domains passed through according to the shortest path priority principle, that is, determine the domain sequence.

[0043] The third step is to determine the dedicated OTN equipment that the service passes through based on the determined domain sequence. Since this networking solution has a mapping relationship between the operator domain and the dedicated OTN equipment, after the domain sequence is determined, the OTN equipment that the service passes through can be determined through simple mapping. There is no need to perform path calculation based on the independent topology of the dedicated OTN equipment.

[0044] Step 5: According to business needs, issue cross-connection instructions on the dedicated OTN equipment to establish business channels.

[0045] When a service fails, the alarm information is collected by the dedicated OTN equipment and reported to the OTN private network management system. The management system calculates a new service path (fault-eliminating path) and sends cross-connection instructions to the dedicated OTN equipment to establish a new channel to restore the failed service.

[0046] The above disclosure is only a preferred embodiment of a method for building a private network and realizing intelligent management and control in a multi-domain OTN network of the present invention. Of course, this cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for building a private network and realizing intelligent management and control in a multi-domain OTN network, characterized in that: The following steps are involved: Build a wide-area dedicated OTN network based on customized small-scale dedicated OTN equipment combined with the operator's OTN network; Based on the independently developed OTN private network management system and the multi-channel intelligent management and control module embedded in the dedicated OTN equipment, the dedicated OTN network is fully managed.

2. The method for constructing a private network and realizing intelligent management and control in a multi-domain OTN network according to claim 1, characterized in that: The dedicated OTN equipment is deployed at the boundary of each operator network domain through which the service passes, and OTU-1 and OTU-2 line interfaces are configured according to the bandwidth requirements of the private network. It can be upgraded to higher capacity interfaces as needed, and the number of interfaces is configured according to the number of different OTN domains connected.

3. The method for constructing a private network and realizing intelligent management and control in a multi-domain OTN network according to claim 1, characterized in that: The dedicated OTN device can flexibly select OTN internal overhead, VC12 channel / 2M interface, serial interface and Ethernet interface as network management channels, support in-band and out-of-band transmission modes, and realize unified management and control of dedicated OTN devices across operator network domains.

4. The method for constructing a private network and realizing intelligent management and control in a multi-domain OTN network according to claim 1, characterized in that: The dedicated OTN equipment and the operator's dedicated line service resources are brought under unified management and control to achieve end-to-end rapid scheduling of cross-domain services, rerouting and recovery when services fail, and have independent operation, management and maintenance capabilities. After the wide-area dedicated OTN network is built, end-to-end service scheduling and service protection and recovery can be performed independently without conflicting with other services of the operator.

5. The method for constructing a private network and realizing intelligent management and control in a multi-domain OTN network according to claim 4, characterized in that: The operator network through which the service passes needs to reserve bandwidth resources, and the dedicated OTN equipment is placed at the boundary of each operator network domain through which the service passes. Based on a proprietary routing calculation method, this method combines the dedicated OTN equipment link detection mechanism and the operator network topology abstraction to complete path selection and realize end-to-end service scheduling.

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