LDPC Bit-to-Symbol Mapping with Priority-Based Error Protection
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Solution Overview
Problem
Conventional transmission coding solutions for wireless communication networks, such as those used in 5G NR communications, do not provide the desired level of speed or customization for efficient operation.
Innovation Solution
A method and apparatus for wireless communications that involve encoding a code block using a low-density parity-check (LDPC) code to generate prioritized encoded bits, which are then arranged within modulation symbols based on their relative priority, and transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transmission coding solutions are used, then the system is simple to implement, but the speed and customization level are insufficient for efficient operation
Solution Approach 1:
The patent implements dynamic bit prioritization where the mapping of encoded bits to modulation symbols is not fixed but adapts based on the degree of each bit. This allows the system to optimize transmission efficiency dynamically by assigning higher priority bits to more significant symbol positions, resolving the contradiction between transmission speed and implementation complexity through adaptive rather than static coding approaches
2Adaptability or versatility
If conventional transmission coding solutions are used, then the implementation is straightforward, but the customization level is insufficient for efficient operation
Solution Approach 1:
The patent applies local quality by treating different encoded bits differently based on their degree. Instead of uniform treatment, each bit position is assigned a specific priority level (first degree, second degree, etc.), and bits with the same degree are grouped together. This localized differentiation enables customization of transmission priorities for different data importance levels, achieving adaptability without requiring complete redesign of the coding framework
3Reliability
If bits are transmitted without prioritization, then the transmission process is simple, but the reliability and error correction performance are reduced
Solution Approach 1:
The patent implements preliminary action by determining the degree of each encoded bit and establishing their priority relationships before the actual modulation and transmission process. The encoder groups bits by degree and pre-determines their mapping positions in modulation symbols, ensuring that higher priority bits are placed in more significant positions. This advance preparation improves reliability without adding complexity during the actual transmission execution
Data Source
AI summary
A new radio (NR) bit prioritization procedure that may be executed by a UE and a base station is disclosed, resulting in transmission and reception of modulation symbols having prioritized bits. For example, a transmitter may encode a code block using low-density parity-check code to generate a stream of encoded bits. The transmitter may arrange the encoded bits in one or more modulation symbols according to a relative priority of the encoded bits. The highest priority bits may be located in the most significant bits of the modulation symbol, and therefore be less likely to experience errors. A receiver may receive the modulation symbols and reorder the encoded bits according to the coding scheme based on the relative priority prior to decoding the encoded bits. The prioritization of the bits within the modulation symbols may provide improved block error rates over sequential mapping of encoded bits to symbols.