OTN Client Signal Mapping with Code Blocks for Low-Rate Traffic
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Solution Overview
Problem
Existing optical transport network (OTN) technologies suffer from significant bandwidth waste when transmitting low-rate signals due to a minimum slot granularity of 1.25 G, leading to inefficiencies in carrying traffic lower than 1.25 G, such as fast ethernet (FE) and synchronous transfer module-1 (STM-1) signals.
Innovation Solution
A method involving mapping client signals into predetermined containers, such as optical service unit (OSU) or ODU containers, and dividing the payload area of optical transport network frames into code blocks using a sigma-delta algorithm to insert idle code blocks for rate adjustment, ensuring efficient bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the minimum slot granularity of 1.25 G is used for signal mapping, then the OTN standard compliance is improved, but the bandwidth utilization deteriorates when carrying low-rate signals
Solution Approach 1:
The patent segments the fixed 1.25G slot into multiple variable-sized sub-slots (e.g., 66b code blocks of approximately 200Mb each). This allows low-rate signals to occupy only the necessary portion of the slot, reducing bandwidth waste while maintaining OTN standard compliance through proper framing and overhead structures.
Solution Approach 2:
The patent introduces dynamic slot allocation where the number and size of sub-slots within a 1.25G slot can be adjusted based on the actual signal rate being carried. This dynamic configuration allows efficient bandwidth utilization for varying signal rates while preserving the fixed 1.25G slot structure required by OTN standards.
2Device complexity
If fixed-size slots are used for mapping, then the device complexity is reduced, but the adaptability to different signal rates deteriorates
Solution Approach 1:
The patent divides each fixed 1.25G slot into multiple standardized 66b code blocks that can be dynamically allocated. This segmentation maintains the simplicity of fixed-size block structures while enabling flexible adaptation to different signal rates by varying the number of blocks assigned to each signal.
Solution Approach 2:
The patent creates a universal mapping structure where the same 1.25G slot format and 66b code block structure can carry signals of various rates (from 2M E1 to 10G Ethernet). The multi-functionality is achieved through flexible allocation of code blocks within the standardized slot, eliminating the need for different mapping structures for different signal types.
Data Source
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AI summary
Provided are a client signal transmission method, apparatus and system and a computer-readable storage medium. The method includes mapping a client signal into a predetermined container corresponding to the client signal; mapping the predetermined container into the corresponding number of first code blocks in a payload area of an optical transport network frame and inserting special idle code blocks during the mapping for rate compensation, where the first code blocks are obtained by dividing the payload area of the optical transport network frame; and sending the optical transport network frame carrying the predetermined container and configuration information of the predetermined container.