Code Block Segmentation for Concatenated Turbo-RS Coding
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Solution Overview
Problem
Wireless cellular networks face challenges in achieving low Block Error Rate (BLER) and low latency in backhaul links due to the error floor of turbo codes in high Signal-to-Noise Ratio (SNR) environments, which traditional turbo coding alone cannot overcome.
Innovation Solution
Concatenating Reed-Solomon (RS) codes with turbo codes as an outer code to form a Forward Error Correction (FEC) system, utilizing a symbol interleaver to disperse errors across multiple RS blocks, and employing flexible FEC segmentation and configuration to optimize error correction capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional turbo coding is used alone, then the system is simple to implement, but it cannot achieve low BLER in high SNR environments due to error floor
Solution Approach 1:
The patent segments the turbo code into multiple constituent encoders (first and second constituent encoders) with different generator polynomials. This segmentation allows each encoder to handle specific parts of the code blocks, improving error correction capability in high SNR environments while maintaining manageable complexity through modular design
Solution Approach 2:
The patent creates a composite coding system by combining multiple turbo code constituent encoders with different generator polynomials (e.g., (133,171) and (155,171)) and integrating them with specific interleavers (QPP, RPP, or custom). This composite structure leverages the strengths of different polynomial configurations to achieve BLER below 10^-6 in high SNR conditions
2Reliability
If concatenated RS and turbo coding is implemented, then error correction capability is significantly improved, but the device complexity increases
Solution Approach 1:
The patent divides code blocks into multiple segments and assigns them to different constituent encoders. Each segment is processed by a specific encoder configuration, allowing the system to handle large code blocks efficiently while maintaining low complexity per encoder unit
Solution Approach 2:
The patent implements dynamic selection of interleaver types (QPP, RPP, or custom) and generator polynomial configurations based on channel conditions and code block size. This dynamic adaptation optimizes error correction performance for different scenarios without requiring a fixed complex structure for all cases
3Reliability
If code blocks are segmented into multiple FEC blocks, then error floor is reduced, but the processing complexity increases
Solution Approach 1:
The patent segments each code block into multiple FEC blocks (e.g., 2-8 segments per code block) and processes them through different constituent encoders. This segmentation reduces the error floor by ensuring that errors in one segment do not propagate to others, while the modular processing keeps complexity manageable
Solution Approach 2:
The patent applies different generator polynomials and interleaver configurations to different FEC blocks based on their specific characteristics and position in the code block. This local optimization ensures that each segment is processed with the most appropriate parameters, improving overall error floor performance without uniform complexity increase
Data Source
AI summary
A user equipment (UE) comprises one or more processors and one or more computer-readable storage media coupled to the one or more processors. The one or more computer-readable storage media store instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising: receiving a transport block of data to be transmitted; obtaining modulation and coding scheme (MCS) parameters for the transport block of data; dividing the transport block of data into a plurality of segments; encoding the plurality of segments using inner and outer error control codes based on the MCS parameters; modulating the encoded plurality of segments to produce symbols; and transmitting, via the transmitter, the symbols using one or more resource elements.