Frame synchronization method and apparatus

A technology of framing and frame header, applied in the field of framing methods and devices, can solve problems such as waste of resources, and achieve the effect of saving resources

Active Publication Date: 2016-03-16
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the waste of resources caused by setting a framing module for each channel in the related art, the present invention provides a framing method and device to at least solve the above problems

Method used

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  • Frame synchronization method and apparatus

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Embodiment 1

[0072] In this embodiment, the framing processing of the GFP-F packets encapsulated in multiple independent ODUs mainly includes the following steps:

[0073] Step 1: Converge the GFP-F data packets encapsulated in multiple independent ODUs in the OTN, and convert the extracted payload data into one-way time-division data after arbitration and channel numbering, and use the channel number to distinguish.

[0074] Step 2, register the lowest four bytes of the input valid data, and at the same time extract the historical four-byte data of the current channel and splice it with the current cycle data, starting from the high-order, each group of four bytes forms N window for descrambling.

[0075] Step 3, perform CRC16 calculation on the first two bytes of each window at the same time, compare with the last two bytes, output 1 if they are the same, and output 0 if they are not connected, and use one bit for each window. At the same time, compare the idle frame for each window, if...

Embodiment 2

[0081] In this embodiment, use TS (time slot, TimeSlot), VC-n (n order virtual container, Virtual container) to transmit the space division data of GFP-F packet in E1 / SDH (Synchronous Digital Hierarchy, SynchronousDigitalHierarchy) and carry out framing , mainly including the following steps:

[0082] Step 1: After channelizing the payload of the space-division data of the GFP-F data packet transmitted by TS and VC-n in E1 / SDH according to the configuration information, it becomes time-division output transmission.

[0083] Step 2, and then decapsulate the GFP-F to extract its internally encapsulated payload. When extracting the payload, the GFP-F frame needs to be framed at first, and the frame can be framed by using the GFP-F multiplexing frame method provided by the embodiment of the present invention.

[0084] Step 3, the last four bytes of data in each beat of the same channel and the next N bytes of data in the channel form N windows for CRC16 calculation and comparison...

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Abstract

The invention discloses a frame synchronization method and apparatus. The method comprises the steps of converting generic framing procedure data of each channel of a plurality channels into a path of time division data which carries a channel identifier of the corresponding channel; and performing frame delimitation of each path of time division data after conversion based on the channel identifier carried in each path of time division data.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a frame fixing method and device. Background technique [0002] GFP (Generic Framing Procedure, Generic Framing Procedure) provides a general mechanism for encapsulating high-level data signals on the transmission network. Transmission in a high-speed physical transmission channel. The data frame can be in PDU (packet data unit, packet data unit) format, or it can be a block-encoded constant bit-rate stream. Therefore, GFP currently defines two data signal encapsulation modes: one is framing mapping GFP (GFP-F), which encapsulates a complete signal frame into a GFP frame before transmission, and the other is transparent mapping GFP ( GFP-T), which encapsulates part of the client signal characters into a GFP frame for transmission. [0003] GFP frames need to rely on some special characters for frame delimitation and provide control information, and for the reserved character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH04J14/08H04Q11/04
Inventor 路海良
Owner ZTE CORP
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