CN114727175A - Data transmission method and equipment - Google Patents
Data transmission method and equipment Download PDFInfo
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- CN114727175A CN114727175A CN202110005421.3A CN202110005421A CN114727175A CN 114727175 A CN114727175 A CN 114727175A CN 202110005421 A CN202110005421 A CN 202110005421A CN 114727175 A CN114727175 A CN 114727175A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0071—Provisions for the electrical-optical layer interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0086—Network resource allocation, dimensioning or optimisation
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Abstract
The embodiment of the invention provides a data transmission method and equipment, belonging to the technical field of optical communication. The data transmission method applied to the first node comprises the following steps: accessing an optical layer overhead of a target service signal, wherein the optical layer overhead comprises an optical layer index overhead and an optical layer performance overhead; determining transmission path information of the target service according to 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 the data transmission equipment can solve the problems of weak monitoring capability of an all-optical domain, long protection switching time, limited coverage range and the like.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a data transmission method and equipment.
Background
As the traffic carrying particles of the optical network grow from GE, 10GE to 100GE or even 400GE, the traffic carrying particles become larger. In order to implement efficient scheduling of large-granule services, an optical cross-connection technology needs to be introduced to implement direct scheduling of wavelength-level services.
The wavelength-level service scheduling is mainly completed by optical node equipment such as ROADM or OXC, firstly, group signals are input to the optical node equipment from a line optical fiber, the node equipment firstly demultiplexes signals in the line, for example, 60 wavelength signals exist in the line, the signals are firstly demultiplexed into 60 single wavelengths, and then, the 60 wavelengths are crossly scheduled to different line directions or downlink through the prior configuration.
Disclosure of Invention
The embodiment of the invention aims to provide a data transmission method and equipment, which can solve the problems of weak monitoring capability of an all-optical domain, long protection switching time, limited coverage range and the like.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present invention provides a data transmission method, applied to a first node, including: accessing an optical layer overhead of a target service signal, wherein the optical layer overhead comprises an optical layer index overhead and an optical layer performance overhead; determining transmission path information of the target service according to 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.
In an exemplary embodiment of the present application, further comprising: receiving an optical cross connection instruction sent by a network manager;
and configuring an optical path to the transmission direction of the target service through optical cross according to the optical cross connection instruction.
In an exemplary embodiment of the present application, the optical layer overhead is configured by a network administrator.
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.
In an exemplary embodiment of the present application, the optical layer index overhead includes at least one of: optical layer identification, alarm indication, management and protection recovery overhead;
the optical layer performance overhead includes at least one of: optical layer channel performance, link performance, and optical path tuning performance overhead.
In an exemplary embodiment of the present application, the optical layer overhead configuration is carried by a set-top signal, the set-top signal comprising: frame preamble, frame header, frame symbol and frame tail.
In an exemplary embodiment of the present application, further comprising: and determining resource information of the adjacent node through a data communication network, wherein the resource information comprises port information and link information, and sending the data of the target service to the adjacent node.
In a second aspect, an embodiment of the present invention provides a data transmission method, which is applied to an intermediate node, and is characterized in that the method includes:
receiving 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 a transmission path of the target service;
receiving the electric layer overhead configuration of the target service sent by the network manager;
if the optical layer performance overhead indicates that no electrical relay is needed, transmitting the data of the target service to the next node at the optical layer direct connection;
if the optical layer performance overhead indicates that electrical relay is required, the optical layer drop enters an electrical cross-bar matrix for regenerative relay or wavelength conversion.
In a third aspect, an embodiment of the present invention provides a data transmission method applied to a second node, including:
receiving optical layer overhead configuration of a target service sent by a network manager, wherein the optical layer overhead includes: optical layer
The optical layer index overhead comprises transmission path information of the target service, and the optical layer performance overhead comprises performance information of each node on the transmission path of the target service;
receiving the electric layer overhead configuration of the target service sent by the network manager;
determining a branch interface of the target service according to the optical layer index overhead;
and sending the data of the target service at the branch interface.
In an exemplary embodiment of the present application, further comprising:
receiving an optical cross connection instruction sent by a network manager;
according to the optical cross connection instruction, dispatching the first line interface to a second line interface matched with electric cross;
receiving an electric cross connection instruction sent by a network manager;
and dispatching the second line interface to a branch service interface through electric crossing according to the electric crossing connection instruction so as to convert the second line interface into the data of the target service.
In a fourth aspect, an embodiment of the present invention provides a node, where the node is a first node, and the node includes:
the access module is used for accessing optical layer overhead of a target service signal, wherein the optical layer overhead comprises optical layer index overhead and optical layer performance overhead;
a path information determining module, configured to determine transmission path information of the target service according to the optical layer index overhead;
a transmission direction determining module, configured to determine a transmission direction of the target service based on the transmission path information of the target service;
and the first sending module is used for sending the data of the target service in the transmission direction.
In an exemplary embodiment of the present application, further comprising:
the first instruction receiving module is used for receiving an optical cross connection instruction sent by a network manager;
and the transmission direction configuration module is used for configuring the optical path to the transmission direction of the target service through optical cross according to the optical cross connection instruction.
In an exemplary embodiment of the present application, the optical layer overhead is configured by a network administrator.
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.
In an exemplary embodiment of the present application, the optical layer indexing overhead comprises at least one of: optical layer identification, alarm indication, management and protection recovery overhead;
the optical layer performance overhead includes at least one of: optical layer channel performance, link performance, and optical path tuning performance overhead.
In an exemplary embodiment of the present application, the optical layer overhead configuration is carried by a set-top signal, the set-top signal comprising: frame preamble, frame header, frame symbol and frame tail.
In an exemplary embodiment of the present application, further comprising:
and the resource information determining module is used for determining the resource information of the adjacent node through a data communication network, wherein the resource information comprises port information and link information, and the data of the target service is sent to the adjacent node.
In a fifth aspect, an embodiment of the present invention provides a node, where the node is an intermediate node, and includes:
a first receiving module, configured to receive optical layer overhead configuration of a target service sent by a network manager, where the optical layer overhead includes: the optical layer index overhead comprises transmission path information of the target service, and the optical layer performance overhead comprises performance information of each node on the transmission path of the target service;
the second receiving module is used for receiving the electric layer overhead configuration of the target service sent by the network manager;
a data transmission module, configured to transmit data of a target service to a next node at the optical layer if the optical layer performance overhead indicates that no electrical relay is required;
and the electric relay module is used for entering the optical layer lower circuit into an electric cross matrix for regenerative relay or wavelength conversion if the optical layer performance overhead indicates that electric relay is needed.
In a sixth aspect, an embodiment of the present invention provides a node, where the node is a second node, and the node includes:
a third receiving module, configured to receive optical layer overhead configuration of a target service sent by a network manager, where the optical layer overhead configuration is an optical layer overhead configuration of the target service sent by the network manager
The overhead includes: the optical layer index overhead comprises transmission path information of the target service, and the optical layer performance overhead comprises performance information of each node on the transmission path of the target service;
the fourth receiving module is used for receiving the electric layer overhead configuration of the target service sent by the network manager;
a branch interface determining module, configured to determine a branch interface of the target service according to the optical layer index overhead;
and the second sending module is used for sending the data of the target service at the branch interface.
In an exemplary embodiment of the present application, further comprising:
the second instruction receiving module is used for receiving the optical cross-connection instruction sent by the network manager;
the first scheduling module is used for scheduling the first line interface to a second line interface adaptive to electric cross according to the optical cross connection instruction;
the third instruction receiving module is used for receiving an electric cross connection instruction sent by a network manager;
and the second scheduling module is used for scheduling the second line interface to the branch service interface through electric crossing according to the electric crossing connection instruction so as to convert the second line interface into the data of the target service.
In a seventh aspect, an embodiment of the present invention provides a communication device, including: a processor, a memory storing a computer program which, when executed by the processor, performs the method as described in the first aspect above, or performs the method as described in the second aspect above, or performs the method as described in the third aspect above.
In an eighth aspect, the present invention provides a readable storage medium, which is characterized in that the readable storage medium stores thereon a program or instructions, and the program or instructions, when executed by a processor, implement the method of the first aspect, or implement the steps of the method of the second aspect, or implement the steps of the method of the third aspect.
According to the data transmission method and the data transmission equipment, in the optical-electrical fusion OTN network, the service is automatically opened through the interactive optical layer overhead among the nodes, the processes of layered setting and electrical layer processing can be reduced, the dependence on a control plane is reduced, and the service is opened end to end in one key mode.
According to the data transmission method and the data transmission equipment, the optimization of the service path is realized by constructing a novel service opening and fault recovery mode.
Drawings
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 attached drawings. The drawings described below are only some embodiments of the present application, and other drawings may be derived from those drawings by those skilled in the art without inventive effort.
Fig. 1 is a flow chart illustrating a method of data transmission according to an example embodiment.
Fig. 2 is a flow chart illustrating another method of data transmission according to an example embodiment.
Fig. 3 is a flow chart illustrating another method of data transmission according to an example embodiment.
Fig. 4 is a block diagram illustrating a first node according to an example embodiment.
Fig. 5 is a block diagram illustrating an intermediate node in accordance with an exemplary embodiment.
Fig. 6 is a block diagram illustrating a second node according to an example embodiment.
Fig. 7 is a block diagram illustrating a structure of a communication device according to an example embodiment.
Fig. 8 is a schematic diagram of an opto-electric hybrid crossover device shown in accordance with an example embodiment.
Fig. 9 is a prior art electrical layer OAM and optical layer OAM architecture.
Fig. 10 is an end-to-end provisioning flow diagram for a service shown in accordance with an example embodiment.
Fig. 11 is a flow diagram illustrating a line degradation process according to an example embodiment.
FIG. 12 is a flow diagram illustrating a line break or node failure process according to an example embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/", and generally means that the former and latter related objects are in an "or" relationship.
The inventor of the present application finds that in the prior art, wavelength-level service scheduling is in an all-optical domain, but the all-optical domain has the disadvantages of weak monitoring capability, long protection switching time, limited coverage range, and the like. The method comprises the following specific steps: (1) weak monitoring capability: due to all-optical cross, the transmission performance information of the service information carried by each wavelength cannot be monitored, such as bit error rate; (2) the coverage is limited, and the manual configuration is complex: after an optical signal is transmitted for a certain distance, the performance of the optical signal is reduced, or service transmission wavelength conflicts across different sections occur in the networking process, so that the coverage area of the all-optical network is limited, an electrical regeneration relay station needs to be manually set in advance for performance regeneration or wavelength conversion, and the network construction cost and the operation and maintenance cost are increased.
In view of various difficulties in the prior art, the scheme provides a data transmission method and device, which can solve the problems of weak monitoring capability of an all-optical domain, long protection switching time, limited coverage range and the like.
Fig. 1 is a flow chart illustrating a method of data transmission according to an example embodiment. As shown in fig. 1, the data transmission method of the present application, applied to a first node, includes at least steps S102 to 108.
S102: and accessing optical layer overhead of the target service signal, wherein the optical layer overhead comprises optical layer index overhead and optical layer performance overhead.
S104: and determining the transmission path information of the target service according to the optical layer index overhead.
S106: and determining the transmission direction of the target service based on the transmission path information of the target service.
S108: and sending the data of the target service in the transmission direction.
Wherein, still include: receiving an optical cross connection instruction sent by a network manager;
and configuring an optical path to the transmission direction of the target service through optical cross according to the optical cross connection instruction.
Wherein the optical layer overhead is configured by a network manager.
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.
Wherein the optical layer index overhead comprises at least one of: optical layer identification, alarm indication, management and protection recovery overhead; the optical layer performance overhead includes at least one of: optical layer channel performance, link performance, and optical path tuning performance overhead.
Wherein the optical layer overhead configuration is carried by a tune-to-top signal, the tune-to-top signal comprising: frame preamble, frame header, frame symbol and frame tail.
Wherein, still include: and determining resource information of the adjacent node through a data communication network, wherein the resource information comprises port information and link information, and sending the data of the target service to the adjacent node.
According to the data transmission method and the data transmission equipment, in the optical-electrical fusion OTN network, the service is automatically opened through the interactive optical layer overhead among the nodes, the processes of layered setting and electrical layer processing can be reduced, the dependence on a control plane is reduced, and the service is opened end to end in one key mode.
According to the data transmission method and the data transmission equipment, the optimization of the service path is realized by constructing a novel service opening and fault recovery mode.
In the optical-electrical fusion OTN network, a service opening process is to establish an optical layer path and a channel, determine a wavelength, establish an electrical layer ODUk, and finally configure cross connection of a client-line interface, wherein different layers are required to be configured respectively, and service opening time is long. With the increase of the number of the access services, the service opening time is influenced by the original service opening process.
The method and the device add an optical layer index overhead and an optical layer performance overhead in the service signal through a top-adjusting mechanism, represent the routing information and the transmission performance of the service, and complete the processing of the service signal by the device on the premise that the optical layer signal is not restored to the electrical layer signal, so that the service is opened, the efficiency of service configuration is improved, and the time for opening the service is shortened.
Fig. 2 is a flowchart illustrating another data transmission method according to an exemplary embodiment, and as shown in fig. 2, a data transmission method of the present application, applied to an intermediate node, includes at least steps 202 to 208.
S202: receiving optical layer overhead configuration of a target service sent by a network manager, where the optical layer overhead includes: the system comprises an optical layer index overhead and an optical layer performance overhead, wherein the optical layer index overhead comprises transmission path information of the target service, and the optical layer performance overhead comprises performance information of each node on the transmission path of the target service.
S204: and receiving the electric layer overhead configuration of the target service sent by the network manager.
S206: if the optical layer performance overhead indicates that no electrical relay is needed, the data of the target service is transmitted to the next node at the optical layer pass-through.
S208: if the optical layer performance overhead indicates that electrical relay is needed, the optical layer drop enters an electrical cross matrix for regenerative relay or wavelength conversion.
Fig. 3 is a flow chart illustrating another method of data transmission according to an example embodiment. As shown in fig. 3, a data transmission method of the present application, applied to a second node, includes at least steps 302 to 308.
S302: receiving optical layer overhead configuration of a target service sent by a network manager, wherein the optical layer overhead includes: the system comprises an optical layer index overhead and an optical layer performance overhead, wherein the optical layer index overhead comprises transmission path information of the target service, and the optical layer performance overhead comprises performance information of each node on the transmission path of the target service.
S304: and receiving the electric layer overhead configuration of the target service sent by the network manager.
S306: and determining a branch interface of the target service according to the optical layer index overhead.
S308: and sending the data of the target service at the branch interface.
Wherein, still include:
receiving an optical cross connection instruction sent by a network manager;
according to the optical cross connection instruction, dispatching the first line interface to a second line interface matched with electric cross;
receiving an electric cross connection instruction sent by a network manager;
and dispatching the second line interface to a branch service interface through electric crossing according to the electric crossing connection instruction so as to convert the second line interface into the data of the target service.
Fig. 4 is a block diagram illustrating a first node according to an example embodiment. As shown in fig. 4, the first node of the present application includes an access module 402, a path information determining module 404, a transmission direction determining module 406, and a first sending module 408.
An access module 402, configured to access an optical layer overhead of a target service signal, where the optical layer overhead includes an optical layer index overhead and an optical layer performance overhead.
A path information determining module 404, configured to determine transmission path information of the target service according to the optical layer index overhead.
A transmission direction determining module 406, configured to determine a transmission direction of the target service based on the transmission path information of the target service.
A first sending module 408, configured to send data of the target service in the transmission direction.
In an exemplary embodiment of the present application, further comprising:
the first instruction receiving module is used for receiving an optical cross connection instruction sent by a network manager;
and the transmission direction configuration module is used for configuring the optical path to the transmission direction of the target service through optical cross according to the optical cross connection instruction.
In an exemplary embodiment of the present application, the optical layer overhead is configured by a network administrator.
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.
In an exemplary embodiment of the present application, the optical layer indexing overhead comprises at least one of: optical layer identification, alarm indication, management and protection recovery overhead;
the optical layer performance overhead includes at least one of: optical layer channel performance, link performance, and optical path tuning performance overhead.
In an exemplary embodiment of the present application, the optical layer overhead configuration is carried by a set-top signal, the set-top signal comprising: frame preamble, frame header, frame symbol and frame tail.
In an exemplary embodiment of the present application, further comprising:
and the resource information determining module is used for determining the resource information of the adjacent node through a data communication network, wherein the resource information comprises port information and link information, and the data of the target service is sent to the adjacent node.
Fig. 5 is a block diagram illustrating an intermediate node in accordance with an exemplary embodiment. As shown in fig. 5, the intermediate node of the present application includes: a first receiving module 502, a second receiving module 504, a data transmitting module 506, and an electrical relay module 508.
A first receiving module 502, configured to receive optical layer overhead configuration of a target service sent by a network manager, where the optical layer overhead includes: the system comprises an optical layer index overhead and an optical layer performance overhead, wherein the optical layer index overhead comprises transmission path information of the target service, and the optical layer performance overhead comprises performance information of each node on the transmission path of the target service.
A second receiving module 504, configured to receive an electrical layer overhead configuration of the target service sent by the network manager.
A data transfer module 506, configured to transfer data of the target service to a next node at the optical layer direct if the optical layer performance overhead indicates that no electrical relay is needed.
An electrical relay module 508, configured to, if the optical layer performance overhead indicates that electrical relay is needed, enter an electrical cross matrix for regenerative relay or wavelength conversion by the optical layer downstream.
Fig. 6 is a block diagram illustrating a second node according to an example embodiment. As shown in fig. 6, 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.
A third receiving module 602, configured to receive optical layer overhead configuration of a target service sent by a network manager, where the optical layer overhead includes: the system comprises an optical layer index overhead and an optical layer performance overhead, wherein the optical layer index overhead comprises transmission path information of the target service, and the optical layer performance overhead comprises performance information of each node on the transmission path of the target service.
A fourth receiving module 604, configured to receive an electrical layer overhead configuration of the target service sent by the network manager.
A branch interface determining module 606, configured to determine a branch interface of the target service according to the optical layer index overhead.
A second sending module 608, configured to send data of the target service at the tributary interface.
In an exemplary embodiment of the present application, further comprising:
the second instruction receiving module is used for receiving the optical cross-connection instruction sent by the network manager;
the first scheduling module is used for scheduling the first line interface to a second line interface adaptive to electric cross according to the optical cross connection instruction;
the third instruction receiving module is used for receiving an electric cross connection instruction sent by a network manager;
and the second scheduling module is used for scheduling the second line interface to the branch service interface through electric crossing according to the electric crossing connection instruction so as to convert the second line interface into the data of the target service.
Fig. 7 is a block diagram illustrating a structure of a communication device according to an example embodiment. As shown in fig. 7, an embodiment of the present disclosure further provides a communication device 70, where the communication device is a terminal or a network device, and the terminal includes: a memory 73; the transceiver 72 and the processor 71, and the transceiver 72 and the memory 73 may be connected by a bus interface, and the functions of the transceiver 72 may be implemented by the processor 71, and the functions of the processor 71 may also be implemented by the transceiver 72.
An embodiment of the present invention further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and the program or the instruction, when executed by a processor, implements each process of the data transmission method embodiment applied to the first node, or the program or the instruction, when executed by the processor, implements each process of the data transmission method embodiment applied to the intermediate node, and when executed by the processor, implements each process of the data transmission method embodiment applied to the second node, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
Wherein, 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 Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.
In the prior art, an optical-electrical fusion OTN device is introduced, and two independent technologies of electrical layer crossing and optical layer crossing are combined together, but various operations including service provisioning are still performed on two layers, for example, configuring an end-to-end service needs to be performed on two layers, as shown in fig. 8.
The method comprises the following steps: firstly, a line port of a wavelength used by a source end is selected through a management and control platform on an optical layer, a cross connection instruction is issued, an optical path is configured to a selected direction in an optical cross matrix, then all parameters passing through an optical amplifier on the optical path are configured, a processing mode of an intermediate node is manually determined according to data of service signal transmission distance, if the optical path passes through an intermediate photoelectric fusion OTN node, an electric relay is not needed, the optical path is directly transmitted to a next node on the optical layer, and if an electric regeneration relay is needed, the optical path firstly enters the electric cross matrix from a lower path of the optical layer to perform regeneration relay. By analogy, each intermediate node needs to be configured until the optical path is configured to the sink node line port. At this time, the light path between the source end and the sink end is matched.
Step two: and at the source end node, configuring the client side service to the source end line port in the step one through the cross matrix of the electrical layer, and then at the destination end node, configuring the signal of the destination end line port to the corresponding client side through the cross matrix of the electrical layer. And completing the end-to-end opening of the service in the photoelectric fusion OTN network.
The existing OTN technology defines the type and frame structure of the electrical layer overhead in detail, including the definition of performance and function OAM, but for each optical layer overhead, only the definition of identification and alarm indication is given, and the detailed definition of the frame structure is lacking, as shown in table 1. The optical layer overhead and the electrical layer overhead are independent and have no synergistic value.
Fig. 9 is a prior art electrical layer OAM and optical layer OAM architecture.
Table 1 shows that the existing optical layer overhead is only related to the LOSs of signal (LOS), wavelength value, frequency spectrum, optical signal to noise ratio (OSNR), power and other indicators of optical performance. The electric layer overhead contains rich information such as identification, network discovery, protection switching, alarm, error code and the like.
The existing optical layer overhead does not have optical layer index overhead, and single wave information cannot detect topology information of the single wave information; the performance overhead of a light layer is avoided, the single-wave power detection is polled and scanned through the 1 × N multi-port spectrum analysis unit, and the efficiency is low; topology information and performance data are associated through some software based on paths, the problems of synchronization of upstream and downstream power detection time of multiple network elements, complex protocol and the like exist, and real-time and simultaneous positioning of multiple wavelength channels cannot be basically realized.
TABLE 1 optical layer overhead and electrical layer overhead distribution
In order to improve convenience and flexibility of all-optical networking scheduling, the patent proposes that interoperation of photoelectric fusion is realized by adding an optical layer OAM, technical conversion from photoelectric separation to photoelectric fusion is realized, ODUk (sub-wavelength) networking application based on an electric layer and wavelength networking application based on an optical layer are organically combined together, advantages of a wavelength/sub-wavelength cross connection function are brought into play together, and transmission, multiplexing, switching, monitoring and protection recovery are provided for client signals. The optical layer completes the crossing of large-particle services, and the electrical layer completes the convergence multiplexing of small-particle services and the electrical relay of services needing electrical relay.
The application provides a data transmission method and equipment, so that the optical layer and the electric layer of a photoelectric fusion node are linked. Firstly, defining and perfecting optical layer overhead and monitoring capability, and secondly realizing photoelectric overhead cooperation:
1. adding optical layer identification/alarm indication/management/protection recovery overhead definition, and defining frame structure detail definition;
2. newly adding overhead standards such as optical layer channel performance, link performance, debugging and the like, and defining a bearing mode (OSC or LS) and a frame structure (single frame/multiframe and byte position);
3. photoelectric overhead coordination: the expenses of the optical layer and the electric layer are fused to support the operation and maintenance of the photoelectric integrated network.
As shown in Table 2, Table 2 shows the new optical layer overhead and electrical layer overhead distributions.
TABLE 2 newly added photosphere cost and electrical layer cost distribution
In the setting of optical layer overhead, there are two types:
1. cost per index of the road-light layer: the OTU (optical forwarding unit) index overhead for transmitting and receiving wavelength signals comprises network element/subframe/single board/port information where the OTU is located, the OTU outputs a code pattern and a central frequency point/frequency spectrum width of the wavelength, the information can represent routing information of services, and the information is visible in real time when passing through each station on a path.
2. Overhead associated with the performance of the lightlayer: including information such as single-wave power, OSNR, etc. of each station on the path. When the performance of the receiving end OTU is degraded, the problem point of single-wave degradation on the path can be judged by detecting the performance overhead degradation and determining the physical path according to the index overhead, so that the single-wave fault point can be efficiently and accurately positioned. The problem of weak monitoring capability in the prior art can be solved.
Through the prejudgment of relevant indexes in the performance overhead, the selection of an optical signal processing mode is accurately and quickly realized, firstly, the performance degradation can be quickly monitored, the network fault can be identified, the optical layer protection or recovery operation can be carried out, and the problem that the coverage is limited in the prior art is solved; then, the optical signal is selectively processed, the optical signal whose transmission performance satisfies the index is transparently transmitted, and the optical signal whose performance is deteriorated during transmission is electrically regenerated.
In order to realize effective bearing and processing of optical layer overhead, the optical layer overhead is adopted, the top modulation technology is that a low-frequency sine or cosine modulation with small amplitude is superposed on each wavelength at an emission end OTU, and when a low-frequency sine or cosine signal is superposed on the optical wavelength, a modulation amplitude is arranged at the top of the optical wavelength. The optical layer can be quickly detected in the optical layer by adopting a top-adjusting mode without analyzing an electric layer signal.
Different wavelength identifiers are adopted for different wavelengths, and different optical wavelengths are identified by detecting the frequency of a tuning signal, wherein the tuning signal comprises the different frequency identifiers; the information carried includes the optical layer index overhead and the optical layer performance overhead.
For the application of the optical layer overhead, respectively in the service opening stage and the operation and maintenance stage:
stage one: service provisioning
1) After the customer service package enters the OTU, the network manager calculates an initial path according to the service source node information and the destination node information (stored in the TTI overhead) and according to a certain rule (for example, the conditions of shortest distance, least passing node, minimum link cost, shortest delay, or a combination of several conditions);
2) and writing information including network element/subframe/single board/port information where the OTU is located, passing intermediate node and port information, code pattern of output wavelength of the OTU, central frequency point/frequency spectrum width and the like into index overhead of a set-top signal, wherein the information is visible in real time when passing through each station on a path.
As shown in fig. 10, a service is established between nodes a and Z, and the processing flow of the service at each node is as follows:
1) the control single board of the node A automatically identifies the optical layer overhead of the signal entering the equipment, reads the service attribute information in the tuning signal, and determines the information of the client service at the source node according to the pre-calculated path information (the service is configured to the corresponding line intersection through electrical cross connection, and the line interface is scheduled to the line direction through optical cross);
2) through DCN interaction, discovering resource information (ports and links) of adjacent nodes, and transmitting the service to corresponding intermediate nodes;
3) the intermediate node appropriately processes the service according to the performance information such as optical power, OSNR and the like in the overhead: if the performance allows, the optical cross-pass is performed. If the performance can not pass through the node, the optical cross-connection is firstly carried out to a local electrical cross-connection matrix for electrical relay: as shown in fig. 3, at intermediate nodes D and E, the optical layer device reads optical power and OSNR (optical signal to noise ratio) information included in the optical layer performance overhead in the tune-top information, and performs corresponding processing on the signal: if the electric relay is not needed, the optical layer is directly transmitted to the next node, and if the electric regenerative relay is needed, the existing optical layer lower circuit enters an electric cross matrix to perform regenerative relay or wavelength conversion. Whether or not to perform electrical relay at the intermediate node is that the source node has already calculated and written into the optical layer performance overhead of the tune-to-top information. And so on until the optical path is passed to the sink node. In the process, the photoelectric fusion OTN equipment node performs related operations according to the read set top information, and a control platform is not required to participate.
4) The sink node firstly schedules the line interface to the line interface adapted to the electrical cross by the optical cross and the electrical cross connects the line interface service to the tributary interface via the cross according to the TTI information: at the destination node Z, the optical cross unit crosses the signal to the corresponding line port according to the information in the top-tuning overhead, and accesses the signal to the module of the electrical cross unit, and the electrical cross unit crosses the signal to the corresponding branch port, and converts the signal into a customer service signal, so as to complete the transmission of the customer signal. In the process, as the photoelectric fusion OTN device node performs related operations according to the read information in the set top overhead, instructions under the control platform are not required to be managed.
And integrating the information source node equipment to complete the related cross configuration and service transmission.
And a second stage: business operation and maintenance
After the source node calculates the path of the service, the passed nodes and paths are fixed, so that the transmission performance of the optical signal is basically clear, that is, the performance parameters (optical power, OSNR, bit error rate and the like) of each node along the path of the signal can be calculated and predicted, so that the source node adds the related optical layer index overhead into the top-modulated signal, and writes the performance parameters predicted when the signal passes through each node along the path into the optical layer performance overhead. The intermediate node thus wavelength-passes the signal through, or enters the electrical layer for electrical regeneration, or enters electrical layer wavelength conversion, depending on the information in the optical layer performance overhead.
In the scene that the whole course is optical layer through, the quality of the signal transmission performance cannot be accurately judged due to no electrical layer access, and meanwhile, optical layer overhead is written in an active OTU port of a source node, so that the optical layer overhead cannot be rewritten in the intermediate through state, so that information in the optical layer performance overhead cannot be updated in real time when performance degradation occurs, and at the moment, related processing can be performed by depending on the nearest adjacent electrical node to update optical layer performance overhead information or index overhead information. The method comprises the following steps:
1) a downstream node Z with electrical processing capability finds signal degradation (non-fiber break fault) by analyzing signals at the electrical layer, and it must be the optical path or equipment between two upstream and downstream nodes that has a problem, as shown in fig. 11, where fig. 11 is a flow chart of the line degradation process according to an exemplary embodiment. The node Z finds that the received signal is degraded, the error rate detected by the service in the electric layer is degraded and is different from the error rate predicted in the optical layer performance overhead, the node Z writes the degraded information into the optical layer performance overhead of the reverse signal, and the information is reversely transmitted to the upstream node A;
2) the upstream node a may determine that the optical path or device between the two nodes is not suitable for use, and recalculate a new path a-B-C-Z to avoid the currently used optical path or device a-D-E-Z.
3) When an optical cable interruption or node failure occurs in the middle of the optical path, the downstream node Z and the upstream node A cannot receive signals with the top-adjusting information, the optical path between the nodes A and Z is no longer available, the upstream node A can judge that the optical path or equipment between the two nodes is no longer available, and a new path A-B-C-Z is recalculated to avoid the currently used optical path or equipment A-D-E-Z.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element identified by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present application may 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 instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (14)
1. A data transmission method is applied to a first node, and is characterized by comprising the following steps:
accessing an optical layer overhead of a target service signal, where 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 a transmission path of the target service;
determining transmission path information of the target service according to 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.
2. The method of claim 1, further comprising:
receiving an optical cross connection instruction sent by a network manager;
and configuring an optical path to the transmission direction of the target service through optical cross according to the optical cross connection instruction.
3. The method of claim 1, wherein the optical layer overhead is configured by a network administrator.
4. The data transmission method of claim 1,
the optical layer index overhead includes at least one of: optical layer identification, alarm indication, management and protection recovery overhead;
the optical layer performance overhead includes at least one of: optical layer channel performance, link performance, and optical path tuning performance overhead.
5. The data transmission method of claim 1, wherein the optical layer overhead configuration is carried by a capping signal, the capping signal comprising: frame preamble, frame header, frame symbol and frame tail.
6. The data transmission method of claim 1, further comprising:
and determining resource information of the adjacent node through a data communication network, wherein the resource information comprises port information and link information, and sending the data of the target service to the adjacent node.
7. A data transmission method is applied to an intermediate node, and is characterized by comprising the following steps:
receiving optical layer overhead configuration of a target service sent by a network manager, wherein the optical layer overhead includes: the optical layer index overhead comprises transmission path information of the target service, and the optical layer performance overhead comprises performance information of each node on the transmission path of the target service;
receiving the electric layer overhead configuration of the target service sent by the network manager;
if the optical layer performance overhead indicates that no electrical relay is needed, transmitting 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 needed, the optical layer drop enters an electrical cross matrix for regenerative relay or wavelength conversion.
8. A data transmission method applied to a second node, comprising:
receiving optical layer overhead configuration of a target service sent by a network manager, where the optical layer overhead includes: the optical layer index overhead comprises transmission path information of the target service, and the optical layer performance overhead comprises performance information of each node on the transmission path of the target service;
receiving the electric layer overhead configuration of the target service sent by the network manager;
determining a branch interface of the target service according to the optical layer index overhead;
and sending the data of the target service at the branch interface.
9. The data transmission method of claim 8, further comprising:
receiving an optical cross connection instruction sent by a network manager;
dispatching the first line interface to a second line interface adaptive to electric cross according to the optical cross connection instruction;
receiving an electric cross connection instruction sent by a network manager;
and dispatching the second line interface to a branch service interface through electric crossing according to the electric cross connection instruction so as to convert the second line interface into the data of the target service.
10. A node, the node being a first node, comprising:
the access module is used for accessing optical layer overhead of a target service signal, wherein the optical layer overhead comprises optical layer index overhead and optical layer performance overhead;
a path information determining module, configured to determine transmission path information of a target service according to the optical layer index overhead;
a transmission direction determining module, configured to determine a transmission direction of the target service based on the transmission path information of the target service;
and the first sending module is used for sending the data of the target service in the transmission direction.
11. A node, the node being an intermediate node, comprising:
a first receiving module, configured to receive optical layer overhead configuration of a target service sent by a network manager, where the optical layer overhead includes: the optical layer index overhead comprises transmission path information of the target service, and the optical layer performance overhead comprises performance information of each node on the transmission path of the target service;
the second receiving module is used for receiving the electric layer overhead configuration of the target service sent by the network manager;
a data transmission module, configured to transmit data of a target service to a next node at the optical layer direct connection if the optical layer performance overhead indicates that no electrical relay is required;
and the electric relay module is used for entering the optical layer lower circuit into an electric cross matrix for regenerative relay or wavelength conversion if the optical layer performance overhead indicates that electric relay is needed.
12. A node, the node being a second node, comprising:
a third receiving module, configured to receive optical layer overhead configuration of a target service sent by a network manager, where the optical layer overhead includes: the optical layer index overhead comprises transmission path information of the target service, and the optical layer performance overhead comprises performance information of each node on the transmission path of the target service;
the fourth receiving module is used for receiving the electric layer overhead configuration of the target service sent by the network manager;
a branch interface determining module, configured to determine a branch interface of the target service according to the optical layer index overhead;
and the second sending module is used for sending the data of the target service at the branch interface.
13. A communication device, comprising: a processor, a memory storing a computer program which, when executed by the processor, performs the method of any of claims 1 to 6, or the method of claim 7, or the method of any of claims 8 to 9.
14. A readable storage medium, characterized in that a program or instructions are stored thereon, which program or instructions, when executed by a processor, carry out the method of any one of claims 1-6, or carry out the steps of the method of claim 7, or carry out the steps of the method of any one of claims 8 to 9.
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