OTN Signal Dispatching via Frame Segmentation and Channel Allocation
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Solution Overview
Problem
Existing asynchronous space division dispatching methods in optical transport networks (OTN) are unable to effectively manage OTU3 signals due to non-integer channel allocation, leading to inefficiencies in signal splitting and combination.
Innovation Solution
A method and apparatus for dispatching OTN signals by assigning overhead bytes containing frame alignment data based on sequence numbers and payload/FEC bytes based on location within the frame, allowing for flexible channel allocation and improved signal management across multiple channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing asynchronous space division dispatching methods are used, then OTU1/ODU1 signals can be managed, but OTU3/ODU3 signals cannot be effectively managed due to non-integer channel allocation
Solution Approach 1:
The invention segments the OTU3 signal frame into multiple 2.5G channels by dividing the frame structure. Each frame is split into multiple sub-frames, and each sub-frame is assigned to a specific channel. This segmentation allows the system to handle OTU3 signals (40G) by breaking them down into manageable 2.5G channels, resolving the non-integer allocation problem while maintaining manageable device complexity
Solution Approach 2:
The invention introduces a time dimension to the channel allocation by using frame sequence numbers and sub-frame indices. Instead of attempting to allocate channels spatially in a single dimension, the system uses temporal sequencing (frame 1, frame 2, frame 3...) to assign different portions of the OTU3 signal to different channels across multiple frames, enabling effective OTU3 management through multi-dimensional allocation
2Adaptability or versatility
If OTU3 signals are split into multiple 2.5G channels, then channel flexibility increases, but frame alignment and signal reconstruction become more complex
Solution Approach 1:
The invention performs preliminary actions by pre-assigning frame alignment bytes (FA bytes) to specific channels before the actual signal transmission. The system determines in advance which frames contain FA bytes for each channel based on frame sequence numbers and sub-frame indices. This preliminary assignment simplifies the reconstruction process at the receiving end, as the alignment information is already organized and ready for use
Solution Approach 2:
The system uses frame sequence numbers and sub-frame indices as feedback mechanisms to track and manage the allocation of signal portions to different channels. This feedback allows the receiving end to correctly reassemble the OTU3 signal by knowing exactly which portions belong to which channels and in what order, reducing the complexity of signal reconstruction
3Reliability
If frame alignment bytes are assigned to multiple channels, then signal recovery is enabled, but overhead byte management becomes more complex
Solution Approach 1:
The invention applies local quality by assigning frame alignment bytes selectively to specific channels based on their needs. Not all channels require FA bytes in every frame - the system determines which channels need alignment information based on the frame sequence number and sub-frame index. This selective assignment reduces overall overhead byte management complexity while ensuring that each channel receives the necessary alignment information for reliable signal recovery
Data Source
AI summary
Methods and apparatuses for dispatching OTN signals are disclosed. The method includes receiving an OTN signal frame; determining in sequence whether each byte in the OTN signal frame is an overhead byte; determining, if the byte is an overhead byte, whether the byte includes frame alignment data; and assigning, if the byte includes frame alignment data, the byte in sequence to a corresponding channel based on a sequence number of an OTN signal frame period, or storing, if the byte does not include frame alignment data, the byte in a buffer; or assigning, if the byte is not an overhead byte, the byte in sequence to a corresponding channel based on a location of the byte in the OTN signal frame.