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CN-122001516-A - Data frame transmission method and device

CN122001516ACN 122001516 ACN122001516 ACN 122001516ACN-122001516-A

Abstract

The application provides a data frame transmission method and a data frame transmission device, which are applied to an optical transmission network and can realize the mapping from a channel layer data frame to a segment layer data frame so as to ensure the transmission performance. The method includes mapping the first data frame to a second payload region and a third payload region of a second data frame, and transmitting the second data frame. The first data frame comprises a first overhead area and a first payload area, the first payload area and the third payload area are the same in size, the number of bits occupied by the second payload area is greater than or equal to the number of bits occupied by the first overhead area, the first overhead area comprises frame alignment signal FAS overhead, and the FAS overhead is used for frame alignment.

Inventors

  • SUN LIANG
  • SU WEI
  • TAN JIEZHEN

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260508
Application Date
20241101

Claims (20)

  1. 1. A method for transmitting a data frame, comprising: Mapping a first data frame to a second payload region and a third payload region of a second data frame, the first data frame including a first overhead region and a first payload region, the first payload region and the third payload region being the same size, the second payload region occupying a number of bits greater than or equal to the number of bits occupied by the first overhead region, the first overhead region including a frame alignment signal overhead, the frame alignment signal overhead being used for frame alignment; and sending the second data frame.
  2. 2. A method for transmitting a data frame, comprising: Receiving a second data frame; Demapping from a second payload area and a third payload area of the second data frame to obtain a first data frame, wherein the first data frame comprises a first overhead area and a first payload area, the first payload area and the third payload area are the same in size, the number of bits occupied by the second payload area is greater than or equal to the number of bits occupied by the first overhead area, the first overhead area comprises frame alignment signal overhead, and the frame alignment signal overhead is used for frame alignment.
  3. 3. The method of claim 1 or 2, wherein the frame alignment signal overhead is located in columns 1 to 4 of row 1 of the first overhead region.
  4. 4. A method according to any one of claims 1 to 3, wherein the first overhead zone further comprises a multiframe alignment signal overhead for multiframe alignment, the multiframe alignment signal overhead being located in column 7 of row 1 of the first overhead zone.
  5. 5. The method of any of claims 1-4, wherein the first overhead zone further comprises customer mapping specific overheads located at columns 7 and 8 of rows 2 through 8 of the first overhead zone.
  6. 6. The method of any of claims 1 to 5, wherein the first overhead region further comprises a path trace identifying TTI overhead, a delay measurement DM overhead, and an automatic protection switching APS overhead, wherein the TTI overhead, the DM overhead, and the APS overhead are arranged in multiple frames of a plurality of data frames, and wherein the TTI overhead, the DM overhead, and the APS overhead occupy columns 5 and 6 of the first 3 rows of each multiple frame.
  7. 7. The method of claim 6, wherein the TTI overhead has a transmission period of 13.392ms, the DM overhead has a transmission period of 6.6959ms, and the APS overhead has a transmission period of 0.83699ms or 0.4185ms.
  8. 8. The method of any of claims 1-7, wherein the first overhead region comprises a plurality of CM overheads, each CM overhead transmitted 2 times in the first data frame, the plurality of CM overheads located in the first 4 columns of the first overhead region.
  9. 9. The method of any of claims 1 to 8, wherein the first data frame is in x rows 82080+y columns, the first overhead region is located in the first y columns of the first data frame, the first payload region is located in the last 82080 columns of the first data frame, and x and y are positive integers.
  10. 10. The method of claim 9, wherein x = y = 8.
  11. 11. The method of any of claims 1 to 10, wherein the second data frame is 4 rows 82240 columns or 8 rows 82240 columns, the second payload region is located in a 149 th column to 160 th column or 153 th column to 160 th column of the second data frame, and the third payload region is located in a last 82080 columns of the second data frame.
  12. 12. The method according to any one of claims 1 to 11, wherein the transmission rate of the first data frame and the transmission rate of the second data frame satisfy: A=B*10261/10280Gbit/s; wherein a represents the transmission rate of the first data frame and B represents the transmission rate of the second data frame.
  13. 13. The method according to any of claims 1 to 12, wherein the transmission rate of the first data frame and the transmission rate of the payload of the second data frame satisfy: A≤B-40ppm; wherein a represents the transmission rate of the first data frame and B represents the transmission rate of the payload of the second data frame.
  14. 14. The method of any of claims 1, 3 to 13, wherein mapping the first data frame to the second payload region and the third payload region in the second data frame comprises: And mapping the first data frame to the second payload area and the third payload area in the second data frame by adopting a General Mapping Procedure (GMP).
  15. 15. The method according to any of claims 2 to 13, wherein demapping the first data frame from the second and third payload areas of the second data frame comprises: And demapping the first data frame from the second payload area and the third payload area of the second data frame by adopting a General Mapping Procedure (GMP).
  16. 16. The method of claim 14 or 15, wherein the second payload region is located in columns 149 to 160 of the second data frame, the second data frame comprising a second overhead region comprising a multiplexed segment level overhead, the second overhead region being located in a first 148 columns of the second data frame, the multiplexed segment level overhead being located in a last 28 columns of the second overhead region.
  17. 17. The method of claim 16, wherein the overhead of the multiplex section level includes first indication information indicating a frame header position of the first data frame.
  18. 18. The method of claim 17, wherein the first indication information is located in lines 2 through 4 and lines 6 through 8 of column 4 of the overhead of the multiplexing segment hierarchy.
  19. 19. The method of any of claims 1, 3 to 13, wherein mapping the first data frame to the second payload region and the third payload region in the second data frame comprises: And mapping the first data frame to the second payload area and the third payload area in the second data frame by adopting a bit synchronous mapping protocol BMP mode.
  20. 20. The method according to any of claims 2 to 13, wherein demapping the first data frame from the second and third payload areas of the second data frame comprises: And demapping the second payload area and the third payload area of the second data frame by adopting a bit synchronous mapping protocol BMP mode to obtain the first data frame.

Description

Data frame transmission method and device Technical Field The present application relates to the field of optical communications, and more particularly, to a method and apparatus for transmitting a data frame. Background Optical networks are gradually evolving towards ultra-high speed transmission technologies, and optical transport network (optical transport network, OTN) technologies such as 100G, 400G, etc. are gradually becoming the main choice of transmission networks. Among them, OTN technology mainly oriented to ultra-large bandwidth transmission, where the transmission speed exceeds 1T bit per second (B1T), is becoming a research hotspot. When the client signal enters the OTN network, the corresponding overhead is added at different levels through multi-layer mapping processing, so that operation, maintenance, management and the like of the corresponding levels of the service are realized. For example, in flexible OTN (flexible optical transport network, flexO) technology, a client signal of over 100Gbit/s ethernet (B100 GE) may be mapped into one or more 100G instances of FlexO-n (e), however, this implementation is only suitable for point-to-point transmission, not flexible enough. Disclosure of Invention The application provides a data frame transmission method and a data frame transmission device, which can realize the mapping from a channel layer data frame to a segment layer data frame, further realize flexible scheduling of a channel layer and ensure transmission performance. In a first aspect, a method for transmitting a data frame is provided. The method may be performed by the transmitting device, and the "transmitting device" in the present application may refer to the transmitting device itself (e.g., an OTN device), a component in the transmitting device (e.g., a communication module, a processor, a circuit, a chip, or a chip system, etc.), or a logic module or software that can implement all or part of the functions of the transmitting device, which is not limited in this application. The method includes mapping a first data frame to a second payload region and a third payload region of a second data frame, the first data frame including a first overhead region and a first payload region, the first payload region and the third payload region being the same size, the second payload region occupying a number of bits greater than or equal to a number of bits occupied by the first overhead region, the first overhead region including (FRAME ALIGNMENT SIGNAL, FAS) overhead, the FAS overhead being used for frame alignment, and transmitting the second data frame. In a second aspect, a method of transmitting a data frame is provided. The method may be performed by the receiving device, and the "receiving device" in the present application may refer to the transmitting device itself (e.g., an OTN device), a component in the receiving device (e.g., a communication module, a processor, a circuit, a chip, or a chip system, etc.), or a logic module or software that can implement all or part of the functions of the receiving device, which is not limited by the present application. The method comprises the steps of receiving a second data frame, and demapping from a second payload area and a third payload area of the second data frame to obtain a first data frame, wherein the first data frame comprises a first overhead area and a first payload area, the first payload area and the third payload area are the same in size, the number of bits occupied by the second payload area is larger than or equal to the number of bits occupied by the first overhead area, the first overhead area comprises frame alignment signal FAS overhead, and the FAS overhead is used for frame alignment. It will be appreciated that the method is applicable to optical transport networks (e.g. OTN). Wherein the mapping of the first data frame to the second payload region and the third payload region of the second data frame is understood as the mapping of the first overhead region and the first payload region of the first data frame to the second payload region and the third payload region of the second data frame by the transmitting device. Wherein the first overhead area is used for bearing overhead information, and the first payload area is used for bearing service data. Based on the above scheme, the sending device maps the first data frame to the second payload area and the third payload area of the second data frame, and correspondingly, the receiving device demaps the first payload area and the first overhead area of the first data frame from the second payload area and the third payload area of the second data frame, so that mapping or adaptation between data frames of different layers can be realized, and further, transmission performance of the data frames is ensured. In addition, an independent FAS is constructed on the first data frame, so that the framing of the first data frame can be completed, and decoupling between d