Data transmission method and device

Abstract

The embodiment of the present invention provides a data transmission method and device, which belongs to the field of optical communication technology. The data transmission method applied to the first node includes: accessing the optical layer overhead of the target service signal, the optical layer overhead including the optical layer index overhead and the optical layer performance overhead; determining the transmission path information of the target service based on the optical layer index overhead; determining the transmission direction of the target service based on the transmission path information of the target service; and sending the data of the target service in the transmission direction. The data transmission method and device involved in this application can solve problems such as weak full optical domain monitoring capability, long protection switching time, and limited coverage.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of communication technology, and in particular to a data transmission method and device. Background Art

[0002] As the granularity of services carried by optical networks increases from GE and 10GE to 100GE and even 400GE, the granularity of services carried is getting larger and larger. To achieve efficient scheduling of large-granularity services, it is necessary to introduce optical cross-connect technology to enable direct scheduling of wavelength-level services.

[0003] The scheduling of wavelength-level services is mainly completed by optical node devices such as ROADM or OXC. First, the group signal is input from the line fiber to the optical node device. The node device first demultiplexes the signal in the line. For example, if there are 60 wavelength signals in the line, they are first demultiplexed into 60 individual wavelengths. Then, after pre-configuration, the 60 wavelengths are cross-scheduled to different line directions or drop channels. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a data transmission method and device that can solve the problems of weak full optical domain monitoring capability, long protection switching time, and limited coverage.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In the first aspect, an embodiment of the present invention provides a data transmission method, applied to a first node, including: accessing the optical layer overhead of the target service signal, the optical layer overhead including the optical layer index overhead and the optical layer performance overhead; determining the transmission path information of the target service based on the optical layer index overhead; determining the transmission direction of the target service based on the transmission path information of the target service; and sending the data of the target service in the transmission direction.

[0007] In an exemplary embodiment of the present application, the method further includes: receiving an optical cross-connect instruction sent by a network manager;

[0008] According to the optical cross-connect instruction, an optical path is configured to the transmission direction of the target service through optical cross-connection.

[0009] In an exemplary embodiment of the present application, the optical layer overhead is configured by a network management.

[0010] In an exemplary embodiment of the present application, the optical layer index overhead includes transmission path information of the target service, and the optical layer performance overhead includes performance information of each node on the transmission path of the target service.

[0011] In an exemplary embodiment of the present application, the optical layer index overhead includes at least one of the following: an optical layer identifier, an alarm indication, a management and protection restoration overhead;

[0012] The optical layer performance overhead includes at least one of the following: optical layer channel performance, link performance and optical path commissioning performance overhead.

[0013] In an exemplary embodiment of the present application, the optical layer overhead configuration is carried by a top modulation signal, and the top modulation signal includes: a frame preamble, a frame header, a frame symbol, and a frame trailer.

[0014] In an exemplary embodiment of the present application, the method further includes: determining resource information of an adjacent node through a data communication network, wherein the resource information includes port information and link information, and sending the data of the target service to the adjacent node.

[0015] In a second aspect, an embodiment of the present invention provides a data transmission method, applied to an intermediate node, characterized by comprising:

[0016] Receive an optical layer overhead configuration of a target service sent by a network manager, where the optical layer overhead includes an optical layer index overhead and an optical layer performance overhead, where the optical layer index overhead includes transmission path information of the target service, and the optical layer performance overhead includes performance information of each node on the transmission path of the target service;

[0017] Receive the electrical layer overhead configuration of the target service sent by the network management;

[0018] If the optical layer performance overhead indicates that electrical relay is not required, the data of the target service is directly transmitted to the next node at the optical layer;

[0019] If the optical layer performance overhead indicates that electrical relaying is required, the optical layer drop enters the electrical cross-connect matrix for regeneration relaying or wavelength conversion.

[0020] In a third aspect, an embodiment of the present invention provides a data transmission method applied to a second node, including:

[0021] Receive the optical layer overhead configuration of the target service sent by the network management, the optical layer overhead includes:

[0022] Index overhead and optical layer performance overhead, wherein the optical layer index overhead includes transmission path information of the target service, and the optical layer performance overhead includes performance information of each node on the transmission path of the target service;

[0023] Receive the electrical layer overhead configuration of the target service sent by the network management;

[0024] determining a tributary interface of the target service according to the optical layer index overhead;

[0025] The data of the target service is sent on the branch interface.

[0026] In an exemplary embodiment of the present application, it further includes:

[0027] Receive optical cross-connect instructions sent by the network management;

[0028] dispatching the first line interface to the second line interface adapted to the electrical cross-connection according to the optical cross-connection instruction;

[0029] Receive electrical cross-connection instructions sent by the network management;

[0030] According to the electrical cross-connection instruction, the second line interface is dispatched to the branch service interface through electrical cross-connection to convert the data into the target service.

[0031] In a fourth aspect, an embodiment of the present invention provides a node, where the node is a first node and includes:

[0032] An access module, configured to access an optical layer overhead of a target service signal, wherein the optical layer overhead includes an optical layer index overhead and an optical layer performance overhead;

[0033] a path information determination module, configured to determine transmission path information of a target service based on the optical layer index overhead;

[0034] A transmission direction determining module, configured to determine the transmission direction of the target service based on the transmission path information of the target service;

[0035] The first sending module is configured to send the data of the target service in the transmission direction.

[0036] In an exemplary embodiment of the present application, it further includes:

[0037] A first instruction receiving module is used to receive an optical cross-connect instruction sent by a network management;

[0038] The transmission direction configuration module is used to configure the optical path to the transmission direction of the target service through the optical cross connection instruction.

[0039] In an exemplary embodiment of the present application, the optical layer overhead is configured by a network management.

[0040] In an exemplary embodiment of the present application, the optical layer index overhead includes transmission path information of the target service, and the optical layer performance overhead includes performance information of each node on the transmission path of the target service.

[0041] In an exemplary embodiment of the present application, the optical layer index overhead includes at least one of the following: an optical layer identifier, an alarm indication, a management and protection restoration overhead;

[0042] The optical layer performance overhead includes at least one of the following: optical layer channel performance, link performance and optical path commissioning performance overhead.

[0043] In an exemplary embodiment of the present application, the optical layer overhead configuration is carried by a top modulation signal, and the top modulation signal includes: a frame preamble, a frame header, a frame symbol, and a frame trailer.

[0044] In an exemplary embodiment of the present application, it further includes:

[0045] The resource information determination module is used to determine the resource information of the adjacent node through the data communication network, wherein the resource information includes port information and link information, and send the data of the target service to the adjacent node.

[0046] In a fifth aspect, an embodiment of the present invention provides a node, which is an intermediate node, including:

[0047] A first receiving module is configured to receive an optical layer overhead configuration of a target service sent by a network manager, wherein the optical layer overhead includes an optical layer index overhead and an optical layer performance overhead, wherein the optical layer index overhead includes transmission path information of the target service, and the optical layer performance overhead includes performance information of each node on the transmission path of the target service;

[0048] The second receiving module is used to receive the electrical layer overhead configuration of the target service sent by the network management;

[0049] A data transmission module is configured to transmit the data of the target service to the next node at the optical layer if the optical layer performance overhead indicates that electrical relay is not required;

[0050] The electrical relay module is used to enable the optical layer drop to enter the electrical cross-connect matrix for regeneration relay or wavelength conversion if the optical layer performance overhead indicates that electrical relay is required.

[0051] In a sixth aspect, an embodiment of the present invention provides a node, where the node is a second node, including:

[0052] The third receiving module is used to receive the optical layer overhead configuration of the target service sent by the network management.

[0053] The overhead includes: an optical layer index overhead and an optical layer performance overhead, wherein the optical layer index overhead includes the transmission path information of the target service, and the optical layer performance overhead includes the performance information of each node on the transmission path of the target service;

[0054] The fourth receiving module is used to receive the electrical layer overhead configuration of the target service sent by the network management;

[0055] A tributary interface determination module, configured to determine a tributary interface of the target service according to the optical layer index overhead;

[0056] The second sending module is configured to send the data of the target service on the branch interface.

[0057] In an exemplary embodiment of the present application, it further includes:

[0058] A second instruction receiving module is used to receive an optical cross-connect instruction sent by the network management;

[0059] A first scheduling module is configured to schedule the first line interface to a second line interface adapted to the electrical cross-connection according to the optical cross-connection instruction;

[0060] A third instruction receiving module is used to receive an electrical cross-connect instruction sent by the network management;

[0061] The second scheduling module is configured to schedule the second line interface to the branch service interface through electrical cross connection according to the electrical cross connection instruction, so as to convert the data into the target service.

[0062] In the seventh aspect, an embodiment of the present invention provides a communication device, comprising: a processor and a memory storing a computer program, wherein when the computer program is executed by the processor, the method described in the first aspect above is executed, or the method described in the second aspect above is executed, or the method described in the third aspect above is executed.

[0063] In the eighth aspect, an embodiment of the present invention provides a readable storage medium, characterized in that a program or instruction is stored on the readable storage medium, and when the program or instruction is executed by the processor, it implements the method described in the first aspect above, or implements the steps of the method described in the second aspect above, or implements the steps of the method described in the third aspect above.

[0064] According to the data transmission method and device of the present application, in the optoelectronic converged OTN network, the service is automatically activated by exchanging optical layer overhead between the nodes themselves, which can reduce the process of layered setting and electrical layer processing, reduce the dependence on the control plane, and realize end-to-end one-click activation of services.

[0065] According to the data transmission method and device of the present application, a new service activation and fault recovery mode is constructed to achieve optimization of service paths. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The above and other objects, features, and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings. The drawings described below are merely some embodiments of the present application, and it is clear to those skilled in the art that other drawings can be derived from these drawings without inventive effort.

[0067] Figure 1 The figure is a flowchart showing a data transmission method according to an exemplary embodiment.

[0068] Figure 2 The figure is a flowchart showing another data transmission method according to an exemplary embodiment.

[0069] Figure 3 The figure is a flowchart showing another data transmission method according to an exemplary embodiment.

[0070] Figure 4 The figure is a structural block diagram of a first node according to an exemplary embodiment.

[0071] Figure 5 The figure is a structural block diagram of an intermediate node according to an exemplary embodiment.

[0072] Figure 6 The figure is a structural block diagram of a second node according to an exemplary embodiment.

[0073] Figure 7 The figure is a structural block diagram of a communication device according to an exemplary embodiment.

[0074] Figure 8 FIG. 1 is a schematic diagram of an optoelectronic hybrid crossbar device according to an exemplary embodiment.

[0075] Figure 9 It is the existing electrical layer OAM and optical layer OAM architecture.

[0076] Figure 10 The figure is a flowchart of end-to-end service activation according to an exemplary embodiment.

[0077] Figure 11 The figure is a flowchart of a line degradation process according to an exemplary embodiment.

[0078] Figure 12 The figure is a flowchart of processing line interruption or node failure according to an exemplary embodiment. DETAILED DESCRIPTION

[0079] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0080] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0081] The inventors of this application have discovered that, in the prior art, wavelength-level service scheduling is performed in the full optical domain, but the full optical domain suffers from shortcomings such as weak monitoring capabilities, long protection switching time, and limited coverage. Specifically, (1) Weak monitoring capabilities: Due to the full optical cross-connection, the transmission performance information of the service information carried by each wavelength cannot be monitored, such as the bit error rate; (2) Limited coverage and complex manual configuration: The performance of the optical signal will degrade after being transmitted over a certain distance, or conflicts may occur in the wavelengths of service transmission across different segments during the networking process, resulting in limited coverage of the full optical network. This requires manual pre-configuration of electrical regeneration relay stations for performance regeneration or wavelength conversion, which increases network construction and operation and maintenance costs.

[0082] In view of the various difficulties existing in the existing technology, this solution proposes a data transmission method and equipment, which can solve the problems of weak full-optical domain monitoring capability, long protection switching time, and limited coverage.

[0083] Figure 1 FIG. 1 is a flow chart showing a data transmission method according to an exemplary embodiment. Figure 1 As shown, the data transmission method of the present application is applied to the first node and at least includes steps S102 to S108.

[0084] S102: Access the optical layer overhead of the target service signal, where the optical layer overhead includes an optical layer index overhead and an optical layer performance overhead.

[0085] S104: Determine transmission path information of the target service according to the optical layer index overhead.

[0086] S106: Determine the transmission direction of the target service based on the transmission path information of the target service.

[0087] S108: Send the data of the target service in the transmission direction.

[0088] The method further includes: receiving an optical cross-connect instruction sent by a network management system;

[0089] According to the optical cross-connect instruction, an optical path is configured to the transmission direction of the target service through optical cross-connection.

[0090] The optical layer overhead is configured by a network management system.

[0091] The optical layer index overhead includes the transmission path information of the target service, and the optical layer performance overhead includes the performance information of each node on the transmission path of the target service.

[0092] Among them, the optical layer index overhead includes at least one of the following: optical layer identification, alarm indication, management and protection recovery overhead; the optical layer performance overhead includes at least one of the following: optical layer channel performance, link performance and optical path commissioning performance overhead.

[0093] The optical layer overhead configuration is carried by a top adjustment signal, and the top adjustment signal includes: a frame preamble, a frame header, a frame symbol, and a frame trailer.

[0094] The method further includes: determining resource information of adjacent nodes through a data communication network, wherein the resource information includes port information and link information, and sending the target service data to the adjacent nodes.

[0095] According to the data transmission method and device of the present application, in the optoelectronic converged OTN network, the service is automatically activated by exchanging optical layer overhead between the nodes themselves, which can reduce the process of layered setting and electrical layer processing, reduce the dependence on the control plane, and realize end-to-end one-click activation of services.

[0096] According to the data transmission method and device of the present application, a new service activation and fault recovery mode is constructed to achieve optimization of service paths.

[0097] In an optoelectronic converged OTN network, the service provisioning process begins with establishing optical layer paths and channels, determining wavelengths, establishing electrical layer ODUk, and finally configuring cross-connections between the customer and line interfaces. This requires separate configuration at each layer, resulting in a long service provisioning time. As the number of access services increases, the existing service provisioning process will impact service provisioning time.

[0098] This application adds an optical layer index overhead and an optical layer performance overhead to the service signal through a top adjustment mechanism to characterize the routing information and transmission performance of the service. The device completes the processing of the service signal by itself without converting the optical layer signal to an electrical layer signal, thereby enabling the service to be activated, improving the efficiency of service configuration, and accelerating the time for service activation.

[0099] Figure 2 is a flow chart showing another data transmission method according to an exemplary embodiment. Figure 2 As shown, a data transmission method of the present application is applied to an intermediate node and at least includes steps 202 to 208.

[0100] S202: Receive the optical layer overhead configuration of the target service sent by the network manager, where the optical layer overhead includes: optical layer index overhead and optical layer performance overhead. The optical layer index overhead contains the transmission path information of the target service, and the optical layer performance overhead contains the performance information of each node on the transmission path of the target service.

[0101] S204: Receive the electrical layer overhead configuration of the target service sent by the network management.

[0102] S206: If the optical layer performance overhead indicates that electrical relay is not required, the data of the target service is directly transmitted to the next node at the optical layer.

[0103] S208: If the optical layer performance overhead indicates that electrical relaying is required, the optical layer drop enters the electrical cross-connect matrix for regeneration relaying or wavelength conversion.

[0104] Figure 3 FIG. 1 is a flow chart showing another data transmission method according to an exemplary embodiment. Figure 3 As shown, a data transmission method of the present application is applied to the second node and at least includes steps 302 to 308.

[0105] S302: Receive the optical layer overhead configuration of the target service sent by the network manager, where the optical layer overhead includes: optical layer index overhead and optical layer performance overhead. The optical layer index overhead contains the transmission path information of the target service, and the optical layer performance overhead contains the performance information of each node on the transmission path of the target service.

[0106] S304: Receive the electrical layer overhead configuration of the target service sent by the network management.

[0107] S306: Determine the tributary interface of the target service according to the optical layer index overhead.

[0108] S308: Send the target service data on the branch interface.

[0109] Among them, also include:

[0110] Receive optical cross-connect instructions sent by the network management;

[0111] dispatching the first line interface to the second line interface adapted to the electrical cross-connection according to the optical cross-connection instruction;

[0112] Receive electrical cross-connection instructions sent by the network management;

[0113] According to the electrical cross-connection instruction, the second line interface is dispatched to the branch service interface through electrical cross-connection to convert the data into the target service.

[0114] Figure 4 FIG. 1 is a structural block diagram of a first node according to an exemplary embodiment. Figure 4 As shown, the first node of the present application includes an access module 402 , a path information determination module 404 , a transmission direction determination module 406 , and a first sending module 408 .

[0115] The access module 402 is configured to access the optical layer overhead of the target service signal, where the optical layer overhead includes an optical layer index overhead and an optical layer performance overhead.

[0116] The path information determination module 404 is configured to determine the transmission path information of the target service according to the optical layer index overhead.

[0117] The transmission direction determining module 406 is configured to determine the transmission direction of the target service based on the transmission path information of the target service.

[0118] The first sending module 408 is configured to send the data of the target service in the transmission direction.

[0119] In an exemplary embodiment of the present application, it further includes:

[0120] A first instruction receiving module is used to receive an optical cross-connect instruction sent by a network management;

[0121] The transmission direction configuration module is used to configure the optical path to the transmission direction of the target service through the optical cross connection instruction.

[0122] In an exemplary embodiment of the present application, the optical layer overhead is configured by a network management.

[0123] In an exemplary embodiment of the present application, the optical layer index overhead includes transmission path information of the target service, and the optical layer performance overhead includes performance information of each node on the transmission path of the target service.

[0124] In an exemplary embodiment of the present application, the optical layer index overhead includes at least one of the following: an optical layer identifier, an alarm indication, a management and protection restoration overhead;

[0125] The optical layer performance overhead includes at least one of the following: optical layer channel performance, link performance and optical path commissioning performance overhead.

[0126] In an exemplary embodiment of the present application, the optical layer overhead configuration is carried by a top modulation signal, and the top modulation signal includes: a frame preamble, a frame header, a frame symbol, and a frame trailer.

[0127] In an exemplary embodiment of the present application, it further includes:

[0128] The resource information determination module is used to determine the resource information of the adjacent node through the data communication network, wherein the resource information includes port information and link information, and send the data of the target service to the adjacent node.

[0129] Figure 5 FIG. 1 is a structural block diagram of an intermediate node according to an exemplary embodiment. Figure 5 As shown, the intermediate node of the present application includes: a first receiving module 502 , a second receiving module 504 , a data transmission module 506 , and an electrical relay module 508 .

[0130] The first receiving module 502 is used to receive the optical layer overhead configuration of the target service sent by the network manager. The optical layer overhead includes: optical layer index overhead and optical layer performance overhead. The optical layer index overhead contains the transmission path information of the target service, and the optical layer performance overhead contains the performance information of each node on the transmission path of the target service.

[0131] The second receiving module 504 is configured to receive the electrical layer overhead configuration of the target service sent by the network management.

[0132] The data transmission module 506 is configured to transmit the target service data to the next node directly at the optical layer if the optical layer performance overhead indicates that electrical relay is not required.

[0133] The electrical relay module 508 is configured to, if the optical layer performance overhead indicates that electrical relay is required, cause the optical layer drop to enter the electrical cross-connect matrix for regeneration relay or wavelength conversion.

[0134] Figure 6 FIG. 1 is a structural block diagram of a second node according to an exemplary embodiment. Figure 6 As shown, the second node of the present application includes: a third receiving module 602 , a fourth receiving module 604 , a branch interface determining module 606 , and a second sending module 608 .

[0135] The third receiving module 602 is used to receive the optical layer overhead configuration of the target service sent by the network manager. The optical layer overhead includes: optical layer index overhead and optical layer performance overhead. The optical layer index overhead contains the transmission path information of the target service, and the optical layer performance overhead contains the performance information of each node on the transmission path of the target service.

[0136] The fourth receiving module 604 is configured to receive the electrical layer overhead configuration of the target service sent by the network management.

[0137] The tributary interface determination module 606 is configured to determine the tributary interface of the target service according to the optical layer index overhead.

[0138] The second sending module 608 is configured to send the target service data on the branch interface.

[0139] In an exemplary embodiment of the present application, it further includes:

[0140] A second instruction receiving module is used to receive an optical cross-connect instruction sent by the network management;

[0141] A first scheduling module is configured to schedule the first line interface to a second line interface adapted to the electrical cross-connection according to the optical cross-connection instruction;

[0142] A third instruction receiving module is used to receive an electrical cross-connect instruction sent by the network management;

[0143] The second scheduling module is configured to schedule the second line interface to the branch service interface through electrical cross connection according to the electrical cross connection instruction, so as to convert the data into the target service.

[0144] Figure 7 FIG. 1 is a structural block diagram of a communication device according to an exemplary embodiment. Figure 7 As shown, an embodiment of the present disclosure also provides a communication device 70, which is a terminal or a network device. The terminal includes: a memory 73; a transceiver 72 and a processor 71, and the transceiver 72 and the memory 73 can be connected through a bus interface. The function of the transceiver 72 can be implemented by the processor 71, and the function of the processor 71 can also be implemented by the transceiver 72.

[0145] An embodiment of the present invention also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by the processor, the various processes of the above-mentioned data transmission method embodiment applied to the first node are implemented, or when the program or instruction is executed by the processor, the various processes of the above-mentioned data transmission method embodiment applied to the intermediate node are implemented. When the program or instruction is executed by the processor, the various processes of the above-mentioned data transmission method embodiment applied to the second node are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0146] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), random access memory (RAM), a magnetic disk, or an optical disk.

[0147] Existing technology introduces optoelectronic converged OTN equipment, combining the two independent technologies of electrical layer cross-connection and optical layer cross-connection. However, various operations including service activation are still performed at the two layers. For example, configuring an end-to-end service needs to be performed at the two layers separately. Figure 8 shown.

[0148] Step 1: First, at the optical layer, the control platform selects the line port of the wavelength used by the source end and issues a cross-connect command. This optical path is then configured in the optical cross-connect matrix to the selected direction. The parameters of all optical amplifiers passing through the optical path are then configured. The processing method at intermediate nodes is manually determined based on the service signal transmission distance. If the signal passes through an intermediate optoelectronic converged OTN node and does not require electrical relaying, it is directly transmitted to the next node at the optical layer. If electrical regeneration relaying is required, it is first dropped from the optical layer and sent to the electrical cross-connect matrix for regeneration relaying. This configuration is repeated at each intermediate node until the optical path is configured to the line port of the sink node. At this point, the optical path between the source and sink ends is established.

[0149] Step 2: At the source node, the client-side service is configured to the source line port in Step 1 through the electrical layer's cross-connect matrix. Then, at the sink node, the signal from the sink line port is configured to the corresponding client side through the electrical layer's cross-connect matrix. This completes the end-to-end service provisioning in the optoelectronic converged OTN network.

[0150] Existing OTN technology defines the types and frame structures of electrical layer overhead in detail, including performance and OAM functionality. However, for each optical layer overhead, only the identifiers and alarm indications are defined, lacking a detailed definition of the frame structure, as shown in Table 1. Optical and electrical layer overheads are independent and lack synergy.

[0151] Figure 9 It is the existing electrical layer OAM and optical layer OAM architecture.

[0152] Table 1 shows that existing optical layer overhead only covers optical performance indicators such as loss of signal (LOS), wavelength, spectrum, optical signal-to-noise ratio (OSNR), and power. However, electrical layer overhead includes a wealth of information, including identification, network discovery, protection switching, alarms, and bit errors.

[0153] The existing optical layer overhead lacks optical layer index overhead, and single-wavelength information cannot detect its topology information. There is no optical layer performance overhead, and single-wavelength power detection is performed through polling scanning by a 1*N multi-port spectrum analysis unit, which is inefficient. Some software associates topology information and performance data based on paths, but there are problems with time synchronization of upstream and downstream power detection of multiple network elements and complex protocols, making it basically impossible to achieve real-time and simultaneous problem location of multiple wavelength channels.

[0154] Table 1 Distribution of optical layer overhead and electrical layer overhead

[0155]

[0156] To enhance the convenience and flexibility of all-optical networking scheduling, this patent proposes to achieve interoperability of optoelectronic fusion by adding optical layer OAM, realizing the technological transition from optoelectronic separation to optoelectronic fusion. This organically combines electrical layer-based ODUk (sub-wavelength) networking applications with optical layer-based wavelength networking applications, leveraging the advantages of wavelength / sub-wavelength cross-connection capabilities to provide transmission, multiplexing, switching, monitoring, and protection and restoration for customer signals. The optical layer completes the cross-connection of large-granularity services, while the electrical layer completes the aggregation and multiplexing of small-granularity services and performs electrical relaying for services that require electrical relaying.

[0157] This application proposes a data transmission method and device to achieve the linkage between the optical layer and the electrical layer of the optoelectronic fusion node. First, define and improve the optical layer overhead and monitoring capabilities, and then achieve optoelectronic overhead coordination:

[0158] 1. Add the definition of optical layer identification / alarm indication / management / protection and recovery overhead, and clarify the definition of frame structure details;

[0159] 2. New overhead standards for optical layer channel performance, link performance, and commissioning are added, and the bearer mode (OSC or LS) and frame structure (single frame / multiframe, byte position) are defined.

[0160] 3. Optical and electrical overhead coordination: The optical and electrical layer overheads are integrated to support integrated optical and electrical network operation and maintenance.

[0161] As shown in Table 2, Table 2 shows the distribution of newly added optical layer overhead and electrical layer overhead.

[0162] Table 2 New optical layer overhead and electrical layer overhead distribution

[0163]

[0164] There are two types of optical layer overhead settings:

[0165] 1. Path-associated optical layer index overhead: The OTU (optical transponder unit, which transmits and receives wavelength signals) index overhead includes information about the network element / subrack / board / port where the OTU is located, the code type, center frequency, and spectrum width of the OTU's output wavelength. This information represents the routing information of the service and is visible in real time at each station along the path.

[0166] 2. Path-associated optical layer performance overhead: This includes information such as single-wavelength power and OSNR at each station along the path. When the receiving OTU performance degrades, the system first detects performance overhead degradation and then determines the physical path based on the index overhead. This allows the point of single-wavelength degradation along the path to be identified, effectively and accurately locating the single-wavelength fault. This addresses the weak monitoring capabilities of existing technologies.

[0167] By predicting relevant indicators in performance overhead, the optical signal processing method can be accurately and quickly selected. First, it can quickly monitor performance degradation, identify network faults, and carry out optical layer protection or recovery operations, solving the limited coverage range in existing technologies. Secondly, it can selectively process optical signals, transparently transmit optical signals whose transmission performance meets the indicators, and electrically regenerate optical signals whose performance degrades during transmission.

[0168] To effectively carry and process optical layer overhead, path-associated optical layer overhead is used. Top modulation (TM) superimposes a small, low-frequency sine or cosine modulation on each wavelength at the transmitting OTU. When this low-frequency sine or cosine signal is superimposed on the optical wavelength, it modulates the top of the wavelength. Using TM at the optical layer enables rapid detection at the optical layer without analyzing electrical layer signals.

[0169] Different wavelengths are identified by using different frequency identifiers. Different optical wavelengths are identified by detecting the frequency of the top-modulation signal. The top-modulation signal contains the information carried, including the optical layer index overhead and the optical layer performance overhead.

[0170] For the application of optical layer overhead, the following are performed during the service activation and operation and maintenance phases:

[0171] Phase 1: Service Activation

[0172] 1) After the customer service is encapsulated and enters the OTU, the network management system calculates an initial path based on the service source node information and sink node information (stored in the TTI overhead) and certain rules (such as shortest distance, fewest nodes passed, lowest link cost, shortest delay, or a combination of these conditions).

[0173] 2) Information including the network element / subrack / board / port information where the OTU is located, the intermediate nodes and ports passed through, the code type of the OTU output wavelength, the center frequency / spectrum width, etc. is written into the index overhead of the top modulation signal. This information is visible in real time when passing through each station on the path.

[0174] like Figure 10 As shown in the figure, a business is established between nodes A and Z. The business processing flow at each node is as follows:

[0175] 1) The control board of node A automatically identifies the optical layer overhead of the signal entering the device, reads the service attribute information in the modulation signal, and determines the source node information of the customer service based on the pre-calculated path information (the service is configured to the corresponding line interface through the electrical cross-connect, and the optical cross-connect dispatches the line interface to the line direction);

[0176] 2) Discover the resource information (ports and links) of adjacent nodes through DCN interaction and transfer the service to the corresponding intermediate node;

[0177] 3) The intermediate node processes the service appropriately based on the performance information such as optical power and OSNR in the overhead: if the performance allows, the service is directly connected via an optical cross-connect. If the performance cannot pass through the node, the service is first dropped via the optical cross-connect to the local electrical cross-connect matrix for electrical relay: Figure 3 As shown, at intermediate nodes D and E, the optical layer equipment reads the optical power and OSNR (Optical Signal-to-Noise Ratio) information contained in the optical layer performance overhead in the top-of-band information and processes the signal accordingly: if electrical relaying is not required, it is directly transmitted to the next node at the optical layer. If electrical regeneration relaying is required, the existing optical layer drop path enters the electrical cross-connect matrix for regeneration relay or wavelength conversion. Whether electrical relaying is performed at the intermediate node is calculated by the source node and written into the optical layer performance overhead in the top-of-band information. This process continues until the optical path is delivered to the sink node. During this process, since the optoelectronic converged OTN equipment nodes perform relevant operations based on the read top-of-band information, no management and control platform involvement is required.

[0178] 4) Based on the TTI information, the sink node first schedules the line interface to a line interface compatible with the electrical cross-connect via an optical cross-connect. The electrical cross-connect then connects the line interface service to the tributary interface via a cross-connect. At sink node Z, the optical cross-connect unit (OCU) cross-connects the signal to the corresponding line port based on the information in the top-to-top overhead. The signal is then connected to the module of the electrical cross-connect unit, which then cross-connects the signal to the corresponding tributary port and converts it into a customer service signal, completing the transmission of the customer signal. In this process, since the optical-electrical converged OTN device node performs relevant operations based on the information read from the top-to-top overhead, no instructions from the management and control platform are required.

[0179] The above information source node equipment completes the relevant cross-configuration and service transmission.

[0180] Phase 2: Business Operation and Maintenance

[0181] After the source node calculates the service path, the nodes and paths it passes through are fixed, so the transmission performance of the optical signal is essentially clear. This means that the signal's performance parameters (optical power, OSNR, bit error rate, etc.) at each node along the way can be predicted through calculation. Therefore, the source node adds the relevant optical layer index overhead to the top-modulated signal and also writes the predicted performance parameters at each node along the way into the optical layer performance overhead. Based on the information in the optical layer performance overhead, intermediate nodes then pass the signal through the wavelength, either forwarding it to the electrical layer for electrical regeneration or forwarding it to the electrical layer for wavelength conversion.

[0182] In the scenario where the entire process is optical layer direct, the signal transmission performance cannot be accurately determined due to the lack of electrical layer access. At the same time, the optical layer overhead is written through the active OTU port of the source node. Therefore, in the intermediate direct state, these optical layer overheads cannot be rewritten. Therefore, when performance degradation occurs, the information in the optical layer performance overhead cannot be updated in real time. At this time, relevant processing can be performed by relying on the nearest adjacent electrical node to update the optical layer performance overhead information or index the overhead information. The steps are as follows:

[0183] 1) A downstream node Z with electrical processing function analyzes the signal at the electrical layer and finds that the signal is degraded (not a fiber interruption fault). This means that there must be a problem in the optical path or equipment between the two upstream and downstream nodes, such as Figure 11 As shown, Figure 11 This is a flowchart illustrating line degradation processing according to an exemplary embodiment. Node Z discovers that the received signal is degraded. The service detects a deteriorating bit error rate at the electrical layer, which differs from the bit error rate predicted in the optical layer performance overhead. Node Z writes this degradation information into the optical layer performance overhead of the reverse signal, which is then transmitted back to upstream node A.

[0184] 2) Upstream node A determines that the optical path or device between the two nodes is not suitable for use, and recalculates a new path ABCZ to avoid the currently used optical path or device ADEZ.

[0185] 3) If an optical cable is disconnected or a node fails in the middle of the optical path, neither the downstream node Z nor the upstream node A can receive the signal with the top adjustment information, indicating that the optical path between A and Z is no longer available. Upstream node A will determine that the optical path or device between the two nodes is completely unavailable and recalculate a new path ABCZ to avoid the currently used optical path or device ADEZ.

[0186] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0187] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0188] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A data transmission method, applied to a first node in an optoelectronic integrated OTN network, characterized in that: include: The optical layer overhead for accessing the target service signal is configured by the network management. The optical layer overhead includes an optical layer index overhead and an optical layer performance overhead. The optical layer index overhead includes transmission path information of the target service, and the optical layer performance overhead includes performance information of each node on the transmission path of the target service. determining transmission path information of a target service according to the optical layer index overhead; Determining a transmission direction of the target service based on the transmission path information of the target service; Sending data of the target service in the transmission direction; Before sending the data of the target service in the transmission direction, the method further includes: receiving an optical cross-connect instruction sent by a network manager; According to the optical cross-connect instruction, an optical path is configured to the transmission direction of the target service through optical cross-connection.

2. The data transmission method according to claim 1, wherein: The optical layer index overhead includes at least one of the following: optical layer identification, alarm indication, management and protection recovery overhead; The optical layer performance overhead includes at least one of the following: optical layer channel performance, link performance and optical path commissioning performance overhead.

3. The data transmission method according to claim 1, wherein: The optical layer overhead is carried by a top adjustment signal, and the top adjustment signal includes: a frame preamble, a frame header, a frame symbol, and a frame trailer.

4. The data transmission method according to claim 1, wherein: Also includes: The resource information of the adjacent node is determined through a data communication network, wherein the resource information includes port information and link information, and the data of the target service is sent to the adjacent node.

5. A data transmission method, applied to an intermediate node in an OTN network, characterized in that: include: Receive an optical layer overhead configuration of a target service sent by a network manager, where the optical layer overhead includes an optical layer index overhead and an optical layer performance overhead, where the optical layer index overhead includes transmission path information of the target service, and the optical layer performance overhead includes performance information of each node on the transmission path of the target service; Receive the electrical layer overhead configuration of the target service sent by the network management; If the optical layer performance overhead indicates that electrical relay is not required, transmitting the data of the target service to the next node at the optical layer; If the optical layer performance overhead indicates that electrical relaying is required, the optical layer drop enters the electrical cross-connect matrix for regeneration relaying or wavelength conversion.

6. A data transmission method, applied to a second node in an OTN network, characterized in that: include: Receive the optical layer overhead configuration of the target service sent by the network management. The optical layer overhead includes: Optical layer index overhead and optical layer performance overhead, wherein the optical layer index overhead includes transmission path information of the target service, and the optical layer performance overhead includes performance information of each node on the transmission path of the target service; Receive the electrical layer overhead configuration of the target service sent by the network management; determining a tributary interface of the target service according to the optical layer index overhead; Sending data of the target service on the tributary interface; Before the tributary interface sends the data of the target service, the method further includes: Receive optical cross-connect instructions sent by the network management; dispatching the first line interface to the second line interface adapted to the electrical cross-connection according to the optical cross-connection instruction; Receive electrical cross-connection instructions sent by the network management; According to the electrical cross-connection instruction, the second line interface is dispatched to the branch service interface through electrical cross-connection to convert the data into the target service.

7. A node, which is a first node in an OTN network, characterized in that: include: An access module for accessing the optical layer overhead of the target service signal, wherein the optical layer overhead is configured by the network management and includes an optical layer index overhead and an optical layer performance overhead; the optical layer index overhead includes the transmission path information of the target service, and the optical layer performance overhead includes the performance information of each node on the transmission path of the target service; a path information determination module, configured to determine transmission path information of a target service based on the optical layer index overhead; A transmission direction determining module, configured to determine the transmission direction of the target service based on the transmission path information of the target service; The first sending module is configured to send the data of the target service in the transmission direction.

8. A node, which is an intermediate node in an OTN network, characterized in that: include: A first receiving module is configured to receive an optical layer overhead configuration of a target service sent by a network manager, wherein the optical layer overhead includes an optical layer index overhead and an optical layer performance overhead, wherein the optical layer index overhead includes transmission path information of the target service, and the optical layer performance overhead includes performance information of each node on the transmission path of the target service; The second receiving module is used to receive the electrical layer overhead configuration of the target service sent by the network management; A data transmission module is configured to transmit the target service data to the next node directly at the optical layer if the optical layer performance overhead indicates that electrical relay is not required; The electrical relay module is used to enable the optical layer drop to enter the electrical cross-connect matrix for regeneration relay or wavelength conversion if the optical layer performance overhead indicates that electrical relay is required.

9. A node, which is a second node in an OTN network, characterized in that: include: The third receiving module is used to receive the optical layer overhead configuration of the target service sent by the network management, wherein the optical layer overhead includes: an optical layer index overhead and an optical layer performance overhead, wherein the optical layer index overhead includes the transmission path information of the target service, and the optical layer performance overhead includes the performance information of each node on the transmission path of the target service; The fourth receiving module is used to receive the electrical layer overhead configuration of the target service sent by the network management; A tributary interface determination module, configured to determine a tributary interface of the target service according to the optical layer index overhead; The second sending module is configured to send the data of the target service on the branch interface.

10. A communication device comprising: A processor and a memory storing a computer program, wherein when the computer program is executed by the processor, the method according to any one of claims 1 to 4, or the method according to claim 5, or the method according to claim 6 is executed.

11. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, it implements the method according to any one of claims 1 to 4, or implements the steps of the method according to claim 5, or implements the steps of the method according to claim 6.

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