WO2020001487A1

WO2020001487A1 - Overhead transmission method and apparatus, and device and computer-readable storage medium

Info

Publication number: WO2020001487A1
Application number: PCT/CN2019/093071
Authority: WO
Inventors: 蒙万洲; 李雯雯
Original assignee: 南京中兴软件有限责任公司
Priority date: 2018-06-28
Filing date: 2019-06-26
Publication date: 2020-01-02
Also published as: CN110661745B; CN110661745A

Abstract

Disclosed are an overhead transmission method and apparatus, and a device and a computer-readable storage medium. The method comprises: extracting overhead data, and caching the overhead data as an overhead frame, wherein the overhead frame comprises: a channel number, a line number and the overhead data; encapsulating the overhead frame into a user-defined overhead data frame; and performing serial transmission of the overhead data according to the type of the user-defined overhead data frame.

Description

Overhead transmission method, device, device and computer-readable storage medium

Technical field

This application relates to the field of communications.

Background technique

In Optical Transport Network (OTN), powerful network maintenance and management functions are implemented through overhead. Overhead processing plays an important role in OTN, such as Automatic Protection Switching / Protection Communication Channel , APS / PCC), General Communication Channel (GCC), etc. In addition, some reserved overhead can also be used to transmit custom information related to the device or user.

As the speed and capacity of OTN equipment continue to increase, for large-capacity equipment, Field Programmable Gate Array (FPGA) resources appear increasingly tight. For example, in some cases, the processing of overhead is relatively independent, usually implemented separately in an FPGA; and if the overhead information is transmitted in parallel, the logic processing is more complex and takes up more hardware pins.

Summary of the invention

According to an aspect of the present invention, an overhead transmission method is provided, including: extracting overhead data and buffering the overhead data as an overhead frame, the overhead frame includes: a channel number, a line number, and overhead data; and the overhead is transmitted. The frame is encapsulated as a custom overhead data frame; and serial transmission of overhead data is performed according to the type of the custom overhead data frame.

According to another aspect of the present invention, an overhead transmission device is provided, including: an extraction module configured to extract overhead data and cache the overhead data as an overhead frame, where the overhead frame includes: a channel number, a line number, and Overhead data; an encapsulation module configured to encapsulate the overhead frame into a custom overhead data frame; and a transmission module configured to perform serial transmission of overhead data according to the type of the custom overhead data frame.

According to yet another aspect herein, an electronic device is provided, including a memory, a processor, and at least one application program stored in the memory and configured to be executed by the processor, when the application program is executed This causes the overhead transmission method described above to be performed.

According to yet another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the above-mentioned overhead transmission method is implemented.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flowchart of an overhead transmission method according to an embodiment of the present disclosure;

2 is a schematic structural diagram of overhead data provided according to an embodiment of the present disclosure;

3 is a schematic structural diagram of a custom overhead data frame according to an embodiment of the present disclosure;

4 is a flowchart of an overhead transmission method according to another embodiment of the present disclosure;

5 is a flowchart of an overhead transmission method according to another embodiment of the present disclosure;

6 is a schematic structural diagram of an overhead data frame provided according to an embodiment of the present disclosure;

7 is an exemplary structural block diagram of an overhead transmission device according to an embodiment of the present disclosure;

8 is an exemplary structural block diagram of an overhead transmission device according to another embodiment of the present disclosure; and

FIG. 9 is a block diagram of an exemplary structure of the transmission module in FIG. 7.

The implementation, functional characteristics and advantages of the purpose of this article will be further explained with reference to the embodiments and the drawings.

detailed description

In order to make the technical problems, technical solutions, and beneficial effects to be solved more clear and comprehensible, the following further describes this article in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this document and are not intended to limit this document.

As shown in FIG. 1, an overhead transmission method according to an embodiment of the present disclosure includes steps S10-S30.

In step S10, overhead data is extracted, and the overhead data is buffered as an overhead frame, where the overhead frame includes: a channel number, a line number, and overhead data.

In step S20, the overhead frame is encapsulated into a custom overhead data frame.

In step S30, serial transmission of overhead data is performed according to the type of the custom overhead data frame.

In the embodiment of the present disclosure, by adding identifiers such as channel numbers and line numbers before the overhead and sequentially buffering them, packaging them into a custom package for serial transmission of OTN overhead, the insertion and extraction of overhead across FPGAs is realized, and the structure is simple. , High portability, greatly saving OTN device pins.

In the embodiment of the present disclosure, the overhead data is extracted from the overhead interface, and written into the cache in the order of the channel number, the line number, and the overhead data (overhead information), and waited for one frame of data to be transmitted to the encapsulation unit together. FIG. 2 is a structure diagram of overhead data of each row.

In the embodiment of the present disclosure, FIG. 3 is a schematic structural diagram of a custom overhead data frame. The frame header includes bytes such as a packet type field, a request channel number, and a request multiframe. The packet type indicates the type of the overhead frame. There are three types of data frame, request frame and data request frame. The payload part is the overhead to be transmitted. The length of the overhead data can be set according to the requirements. Finally, there is a 4-byte check byte FCS. Specifically, the custom overhead data frame may include, for example, the following fields: Pre & SFD, pkg_type, req_ch_id, reqmfas, oh valid, SA, Len / Type, 18 × 20 lines of overhead information, and FCS.

As shown in FIG. 4, in the embodiment of the present disclosure, before step S20, the method further includes step S101.

In step S101, an overhead request and a requested multiframe value are obtained.

A certain initial value may be used as the requested multiframe value MFAS, and then the requested multiframe value is sequentially superimposed.

The insert data packet (insert overhead data frame) is the overhead data that is sent to the initiator after processing by the feedback end. There is a delay from sending the overhead request to receiving the insert data packet. In order to continuously insert overhead into the service, some overhead data needs to be buffered. Need to design the cache pipeline and appropriate request interval control.

In the embodiment of the present disclosure, step S20 includes: obtaining a cache pipeline from the overhead frame; and packaging the overhead frame into a custom overhead data frame according to the overhead request and the cache pipeline.

Specifically, the overhead frame type is determined according to the overhead request and the buffer pipeline (one frame of data information), the state machine jump is started, and a packet process is started; if the overhead request is received, the channel number and the multiframe value MFAS lock will be requested Save, and return a response signal. The sending unit of the initiator sends the custom overhead frame to the feedback terminal; the feedback terminal receives the custom overhead data frame of the initiator and sends it to the de-framing unit, parses the overhead information in the custom overhead data frame, and outputs a valid channel number, Line number and overhead data.

In the embodiment of the present disclosure, the types of the custom overhead data frames include: a data frame, a request frame, and a data request frame.

FIG. 5 is a flowchart of an overhead transmission method according to another embodiment of the present disclosure, which may show a specific operation of step S30 in FIG. 1. As shown in FIG. 5, step S30 includes: steps S31-S33.

In step S31, it is determined whether the type of the custom overhead data frame is a data frame. If yes, go to step S32; if no, go to step S33.

In step S32, extraction is performed according to the line number to output the corresponding channel number, requested multiframe value, and overhead data.

In step S33, the overhead request, the channel number, and the requested multiframe value are extracted and buffered, and a framing operation is performed according to the channel number and the requested multiframe value, and encapsulated into an overhead data frame for transmission.

In the embodiment of the present disclosure, since the overhead is transmitted in rows, only the first row can extract the multi-frame value MFAS. In this case, the channel number can be used as the write address in the first line, MFAS can be stored in the random access memory (RAM), and the channel number is used as the read address in the subsequent lines 2, 3, and 4, for example. Read MFAS information from RAM.

In the embodiment of the present disclosure, step S33 may further include: extracting and caching the request indication, the request channel number, and the requested multiframe value, maintaining a state machine, and when the framing unit is idle and the cache is not empty, the overhead of the cache is Read the request information; select the overhead bytes to be inserted according to the requested channel number and the requested multiframe, and output the overhead to be inserted into the framing unit; when the overhead insertion request is valid, start the state machine to perform the framing operation, and set the overhead to be inserted according to A certain format is encapsulated as an insert overhead data frame. The certain format is, for example, the format shown in FIG. 6.

FIG. 6 is a schematic structural diagram of an inserted overhead data frame according to an embodiment of the present disclosure. As shown in FIG. 6, the frame header part includes the frame length; the payload part includes the requested channel number, the overhead bytes of the requested insertion, and the overhead enable. The length of the insertion overhead can be set according to requirements. The check byte is a 4-byte cyclic redundancy (CRC) check. Specifically, the inserted overhead data frame may include the following fields: ch_id, MFAS, GCC0, GCC1, GCC2, APS / PCC, INS_EN, DMT, RES, Pre & SFD, DA, SA, Len / Type, 16x10 frame overhead information, FCS .

In the embodiment of the present disclosure, after step S33, the method may further include: the sending unit at the feedback end sends the customized insertion overhead frame to the initiator; the initiator receives the insertion overhead frame at the feedback end and sends it to the decapsulation unit; Decapsulate to obtain the overhead information, and simultaneously latch the channel number, and store them in the cache together. After the buffering of one frame, read the overhead data and output it to the insert cache control unit; according to the latched channel number, insert the overhead cost to each channel. In the RAM corresponding to the overhead, one frame overhead is stored. After the MFAS value is equal, the overhead data with the same channel number and the overhead insertion request channel number is output to the overhead insertion unit; the overhead to be inserted is loaded into the OTN frame. According to the overhead insert enable, decide whether to insert, the enable signal is configured by software.

FIG. 7 is an exemplary structural block diagram of an overhead transmission apparatus according to an embodiment of the present disclosure. As shown in FIG. 7, an overhead transmission device includes: an extraction module 10, an encapsulation module 20, and a transmission module 30.

The extraction module 10 is configured to extract overhead data and cache the overhead data as an overhead frame, where the overhead frame includes: a channel number, a line number, and overhead data.

The encapsulation module 20 is configured to encapsulate the overhead frame into a custom overhead data frame.

The transmission module 30 is configured to perform serial transmission of overhead data according to the type of the custom overhead data frame.

In the embodiment of the present disclosure, the overhead data is extracted from the overhead interface, and written into the cache in the order of the channel number, line number, and overhead data, and waits for one frame of data to be transmitted to the encapsulation unit together. Figure 2 shows the overhead data for each row. Schematic diagram of the structure.

In the embodiment of the present disclosure, FIG. 3 is a schematic structural diagram of a custom overhead data frame. The frame header includes bytes such as a packet type field, a request channel number, and a request multiframe. The packet type indicates the type of the overhead frame. There are three types of data frame, request frame and data request frame. The payload part is the overhead to be transmitted. The length of the overhead information can be set according to the requirements. Finally, there is a 4-byte check byte FCS.

As shown in FIG. 8, in the embodiment of the present disclosure, in addition to the extraction module 10, the encapsulation module 20, and the transmission module 30, the overhead transmission device further includes an insertion module 40.

The inserting module 40 is configured to obtain an overhead request and request a multiframe value.

The insert data packet is the overhead data that is sent to the initiator after being processed by the feedback end. There is a delay from sending the overhead request to receiving the insert data packet. In order to continuously insert the overhead into the service, some overhead data needs to be buffered. Need to design the cache pipeline and appropriate request interval control.

In the embodiment of the present disclosure, the encapsulation module 20 may be further configured to: obtain a cache pipeline from the overhead frame; and encapsulate the overhead frame into a custom overhead data frame according to the overhead request and the cache pipeline. .

FIG. 9 is a block diagram of an exemplary structure of the transmission module in FIG. 7. As shown in FIG. 9, the transmission module includes a determination unit 31, a first transmission unit 32, and a second transmission unit 33.

The determining unit 31 is configured to determine whether the type of the custom overhead data frame is a data frame.

The first transmission unit 32 is configured to: when the type of the custom overhead data frame is a data frame, perform extraction according to a line number to output a corresponding channel number, a requested multiframe value, and overhead data.

The second transmitting unit 33 is configured to: when the type of the custom overhead data frame is a request frame or a data request frame, extract and cache the overhead request, the channel number, and the requested multiframe value, and according to the The channel number and the requested multiframe value are used for framing operations, and are encapsulated into an overhead data frame for transmission.

In the embodiment of the present disclosure, the second transmission unit may be further configured to extract and cache the request indication, the request channel number, and the requested multiframe value, and maintain a state machine. When the framing unit is idle and the cache is not empty, the second transmission unit Read out the buffered overhead request information; select the overhead bytes to be inserted according to the requested channel number and the requested multiframe, and output the overhead to be inserted to the framing unit; when the overhead insertion request is valid, start the state machine for framing operation and wait for the The insertion overhead is encapsulated into an insertion overhead data frame according to, for example, the format shown in FIG. 6, where, as shown in FIG. 6, the frame header part includes the frame length. The payload part includes the request channel number, the overhead bytes requested for insertion, and the overhead enable. The length of the insertion overhead can be set according to requirements. The check byte is a 4-byte CRC check.

In the embodiment of the present disclosure, the second transmission unit may be further configured as: the sending unit at the feedback end sends the custom insertion overhead frame to the initiator; the initiator receives the insertion overhead frame at the feedback end and sends it to the decapsulation unit; the insertion overhead The frame is decapsulated to obtain the overhead information, and the channel number is latched and stored together in the cache. After the frame is cached, the overhead data is read out and output to the insert cache control unit; the overhead is inserted into the cache according to the latched channel number. One frame overhead is stored in the RAM corresponding to each overhead. After the MFAS value is equal, the overhead data with the same channel number and overhead insertion request channel number is output to the overhead insertion unit; the overhead to be inserted is loaded into the OTN frame. According to the overhead insert enable, decide whether to insert, the enable signal is configured by software.

An embodiment of the present disclosure further provides an electronic device. The electronic device may include: a memory, a processor, and at least one application program stored in the memory and configured to be executed by the processor, when the application program is executed Causes the overhead transmission method according to the above embodiments to be executed.

An embodiment of the present disclosure provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the methods described in the foregoing embodiments are implemented.

It should be noted that the embodiments of the device, device, and computer-readable storage medium belong to the same concept as the above method embodiments, so the specific implementation process can refer to the method embodiment, and the technical features in the method embodiment are implemented in the device The examples are applicable, so I won't repeat them here.

In the overhead transmission method, device, device, and computer-readable storage medium according to the embodiments of the present disclosure, overhead data can be extracted and cached as overhead frames. The overhead frames include: channel number, line number, and overhead data. ; Encapsulate the overhead frame into a custom overhead data frame; perform serial transmission of overhead data according to the type of the custom overhead data frame. By adding identifiers such as channel numbers and line numbers before the overhead and sequentially buffering them, they are packaged into a custom package for serial transmission of OTN overhead, which realizes the insertion and extraction of overhead across FPGAs, with a simple structure, high portability, and great savings. OTN device pins.

Through the description of the foregoing implementation manners, those skilled in the art can clearly understand that the methods in the foregoing embodiments can be implemented by means of software plus a necessary universal hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the technical solution of the present disclosure that is essentially or contributes to the existing technology can be embodied in the form of a software product that is stored in a storage medium (such as ROM / RAM, magnetic disk, The optical disc) includes several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods of the embodiments of the present disclosure.

The exemplary embodiments of the present disclosure have been described above with reference to the accompanying drawings, and thus do not limit the scope of rights of the present disclosure. Any modification, equivalent replacement, and improvement made by those skilled in the art without departing from the scope and substance of the present disclosure shall fall within the scope of rights of the present disclosure.

Claims

An overhead transmission method includes:

Extracting overhead data and buffering the overhead data into an overhead frame, where the overhead frame includes: a channel number, a line number, and overhead data;

Encapsulating the overhead frame into a custom overhead data frame; and

Perform serial transmission of overhead data according to the type of the custom overhead data frame.
The method for transmitting overhead according to claim 1, wherein before the encapsulating the overhead frame into a custom overhead data frame, the method further comprises:

Gets the overhead request and the requested multiframe value.
The overhead transmission method according to claim 2, wherein the encapsulating the overhead frame into a custom overhead data frame comprises:

Obtaining a cache pipeline from the overhead frame; and

Encapsulate the overhead frame into a custom overhead data frame according to the overhead request and the cache pipeline.
The overhead transmission method according to claim 3, wherein the type of the custom overhead data frame comprises: a data frame, a request frame, and a data request frame, and the overhead is performed according to the type of the custom overhead data frame. The serial transmission of data includes:

Determining whether the type of the custom overhead data frame is a data frame,

If the type of the custom overhead data frame is a data frame, extracting according to the line number to output the corresponding channel number, requested multiframe value, and overhead data;

If the type of the custom overhead data frame is not a data frame, the overhead request, the channel number, and the requested multiframe value are extracted and buffered, and a framing operation is performed according to the channel number and the requested multiframe value, and the package is encapsulated. Transmission for inserting overhead data frames.
An overhead transmission device includes:

An extraction module configured to extract overhead data and cache the overhead data as an overhead frame, where the overhead frame includes: a channel number, a line number, and overhead data;

An encapsulation module configured to encapsulate the overhead frame into a custom overhead data frame; and

A transmission module configured to perform serial transmission of overhead data according to the type of the custom overhead data frame.
The overhead transmission device according to claim 5, further comprising:

Inserting a module, which is set to obtain an overhead request and request a multiframe value.
The overhead transmission device according to claim 6, wherein the encapsulation module is further configured to:

Obtaining a cache pipeline from the overhead frame; and

Encapsulate the overhead frame into a custom overhead data frame according to the overhead request and the cache pipeline.
The overhead transmission device according to claim 7, wherein the type of the custom overhead data frame includes: a data frame, a request frame, and a data request frame, and the transmission module includes:

A judging unit, configured to judge whether the type of the custom overhead data frame is a data frame;

A first transmission unit, which is configured to: when the type of the custom overhead data frame is a data frame, extract according to a line number to output a corresponding channel number, a requested multiframe value, and overhead data;

A second transmission unit configured to extract and buffer the overhead request, channel number, and requested multiframe value when the type of the custom overhead data frame is a request frame or a data request frame, and according to the channel The number and the requested multiframe value are used for framing operation, and are encapsulated into an overhead data frame for transmission.
An electronic device includes a memory, a processor, and at least one application program stored in the memory and configured to be executed by the processor, wherein when the application program is executed, execution of claims 1- The overhead transmission method according to any one of 4.
A computer-readable storage medium, in which a computer program is stored, and when the program is executed by a processor, the overhead transmission method according to any one of claims 1-4 is implemented.