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CN-122001515-A - Data frame transmission method and device

CN122001515ACN 122001515 ACN122001515 ACN 122001515ACN-122001515-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 sizes of the first payload area and the third payload area are the same, and 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.

Inventors

  • SUN LIANG
  • SU WEI

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, wherein the first data frame comprises a first overhead region and a first payload region, the first payload region and the third payload region have the same size, and the number of bits occupied by the second payload region is greater than or equal to the number of bits occupied by the first overhead region; 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, and 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.
  3. 3. The method of claim 1 or 2, 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.
  4. 4. A method according to claim 3, characterized in that x = y = 8.
  5. 5. The method of any of claims 1-4, wherein the second data frame is 4 rows 82240 columns or 8 rows 82240 columns, the second payload region is located at 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 at a rear 82080 column of the second data frame.
  6. 6. The method according to any one of claims 1 to 5, 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.
  7. 7. The method according to any one of claims 1 to 6, 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.
  8. 8. The method of any of claims 1,3 to 7, 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).
  9. 9. The method according to any of claims 2 to 7, 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).
  10. 10. The method of claim 8 or 9, wherein the second payload region is located in columns 149 to 160 of the second data frame, the second data frame including a second overhead region including 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.
  11. 11. The method of claim 10, wherein the overhead of the multiplex section level includes first indication information indicating a frame header position of the first data frame.
  12. 12. The method of claim 11, wherein the first indication information is located in row 2 through row 4 and row 6 through row 8 of column 4 of the overhead of the multiplex section hierarchy.
  13. 13. The method of any of claims 1, 3 to 7, 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.
  14. 14. The method according to any of claims 2 to 7, 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.
  15. 15. The method of claim 13 or 14, wherein the second payload region is located in columns 153 to 160 of the second data frame, the second data frame including a second overhead region including a multiplexed segment level overhead, the second overhead region being located in a first 152 columns of the second data frame, the multiplexed segment level overhead being located in a last 32 columns of the second overhead region.
  16. 16. The method of claim 15, wherein the first overhead region maps to the second payload region and the first payload region maps to the third payload region.
  17. 17. The method according to any of claims 1 to 16, wherein the first overhead area comprises a multiframe alignment signal, MFAS, overhead, the MFAS overhead being for multiframe alignment, the MFAS overhead being located at row 1, column 7 of the first overhead area, the MFAS occupying a number of bytes of 1 byte.
  18. 18. The method of any one of claims 1 to 17, wherein the first overhead region comprises at least one of a path trace identifying TTI overhead, a delay measurement DM overhead, a channel layer path monitoring PM overhead, a tandem connection monitoring TCM overhead, or an automatic protection switching APS overhead, wherein the TTI overhead, the DM overhead, and the APS overhead are arranged in multiple frames of 4 data frames, and wherein the TTI overhead, the DM overhead, and the APS overhead are located in columns 5 and 6 of the first 3 rows of the first overhead region.
  19. 19. The method of claim 18, wherein the TTI overhead is sent with a period of 13.392ms, the DM overhead is sent with a period of 6.6959ms, and the APS overhead is sent with a period of 0.83699ms or 0.4185ms.
  20. 20. The method of any of claims 1-19, wherein the first overhead region comprises a plurality of CM overheads, each CM overhead of the plurality of CM overheads being transmitted 2 times in the first data frame, the plurality of CM overheads being located in a first 4 columns of the first overhead region.

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 the 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, 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, and 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. 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. It will be appreciated that since the first payload region and the third payload region are the same size, for example, the number of rows and columns occupied by the first payload region and the third payload region are the same. The design mode can realize synchronous mapping, reduce the complexity of mapping processing and reduce power consumption. In addition, based on the fact that the f