OTN Client Signal Block Mapping Sub-Structure
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Solution Overview
Problem
The existing mapping methods for client signals in Optical Transport Networks (OTNs) are complex and inefficient, particularly when handling multi-rate services, as they require intricate sigma-delta calculations for each clock cycle, complicating the process of mapping and demapping client signals.
Innovation Solution
The method involves block mapping of client signals using a mapping granularity of blocks, dividing the OPUk payload area into sub-blocks of N bytes, and using mapping overhead information to simplify the mapping process, allowing for flexible and efficient handling of multi-rate services by uniformly distributing client signal sub-blocks and stuff sub-blocks within the payload area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing mapping methods based on GMP are used to map client signal to OPU0, then the mapping can be completed, but the mapping process becomes complicated due to requiring 16 times of sigma-delta calculation in each clock cycle
Solution Approach 1:
The OPUk payload area is divided into multiple sub-blocks, each sub-block independently mapped with client signal sub-blocks. This segmentation allows parallel processing and reduces the computational burden on each clock cycle by distributing the mapping operations across multiple smaller units rather than processing the entire payload area sequentially.
Solution Approach 2:
Instead of performing complete sigma-delta calculations for all 16 times in each clock cycle as required by existing GMP methods, the patent performs partial mapping operations on sub-blocks. The mapping overhead information indicates which sub-blocks need mapping in each clock cycle, allowing the system to perform only the necessary partial actions rather than redundant complete calculations, thereby reducing complexity while maintaining mapping accuracy.
2Device complexity
If block mapping with N-byte granularity is implemented, then the mapping process is simplified, but the device complexity increases due to needing to divide payload area into sub-blocks and manage mapping overhead information
Solution Approach 1:
The payload area is pre-divided into sub-blocks of N bytes before the actual mapping operation. Mapping overhead information is prepared in advance to indicate which sub-blocks contain client signal data and which contain stuff sub-blocks. This preliminary structuring simplifies the subsequent mapping process by providing a ready-made framework that guides the mapping operations without requiring complex real-time decisions.
Solution Approach 2:
Mapping overhead information serves as an intermediary between the payload area structure and the mapping operation. This overhead information contains indication information that mediates the mapping process by specifying which sub-blocks need mapping and where client signal sub-blocks are located, thereby simplifying the mapping logic without requiring direct complex analysis of the entire payload area structure during mapping operations.
Data Source
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AI summary
A method and a device for mapping and demapping a client signal are provided. The method for mapping a client signal includes: dividing a part or all of a payload area of an Optical Channel Payload Unit (OPU) or Optical channel Data Tributary Unit (ODTU) into several sub-blocks, in which the sub-blocks have a size of N bytes, and N is greater than or equal to 1; and mapping a client signal to be transported to the sub-blocks of the payload area with an N-byte granularity. In the technical solutions, when the client signal is mapped, block mapping of the client signal is performed by using a mapping granularity of a block, so that the complexity of the mapping process of the client signal can be reduced, thereby meeting requirements of multi-rate services.