Priority Bit Mapping in LDPC Symbols for Lower NR Block Errors
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Solution Overview
Problem
Conventional transmission coding solutions in wireless communication networks, such as those for 5G NR communications, do not provide the desired level of speed or customization for efficient operation, particularly in handling prioritized data transmission.
Innovation Solution
The method involves encoding a code block using a low-density parity-check (LDPC) code to generate systematic and parity bits, determining their degrees, assigning relative priorities, and arranging these bits within modulation symbols based on priority, enabling more reliable transmission by mapping higher priority bits to more significant locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transmission coding solutions are used, then the system is simple to implement, but the transmission speed and customization capability are insufficient
Solution Approach 1:
The patent performs preliminary actions by determining the degree and priority of each encoded bit before mapping to modulation symbols. The encoder calculates the degree of each bit based on the LDPC code structure, assigns priorities accordingly, and arranges bits in priority order before modulation. This preliminary organization enables faster and more efficient transmission by optimizing the mapping process in advance.
2Adaptability or versatility
If conventional transmission coding solutions are used, then the implementation is straightforward, but the customization capability is limited
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the system to adjust bit prioritization based on different service requirements. The encoder can dynamically determine bit degrees and priorities according to varying channel conditions, modulation schemes, and service types (e.g., eMBB, URLLC, mMTC). This dynamic approach enables customization without requiring multiple separate coding schemes.
3Reliability
If bits are mapped without priority consideration, then the mapping process is simple and fast, but the transmission reliability is reduced
Solution Approach 1:
The patent applies local quality by treating different encoded bits differently based on their importance. Instead of uniform mapping, the system determines the degree of each bit (how many check equations it participates in) and assigns higher priorities to bits with higher degrees. This localized differentiation ensures that more critical bits are mapped to more reliable modulation symbol positions, improving overall transmission reliability.
4Productivity
If higher order modulation schemes are used, then the data transmission rate increases, but the susceptibility to interference increases
Solution Approach 1:
The patent changes the mapping parameters by introducing priority-based arrangement of encoded bits before modulation. In higher order modulation schemes like 256-QAM, the system maps high-priority bits to more significant bit positions within modulation symbols, which are less susceptible to interference. This parameter change in bit arrangement allows the system to maintain high data rates while improving resistance to interference through intelligent bit positioning.
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.