Polar Code Interleaving for 5G DCI Decoding
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, the traditional methods for channel coding in LTE systems face challenges in optimizing decoding performance due to the continuous nature of bits in Downlink Control Information (DCI) formats, which affects the efficiency of polar code decoding.
Innovation Solution
A method is introduced where a first information block, comprising M sub-information blocks and Q padding bits, is generated and interleaved to create a bit block for polar code channel coding, allowing for discontinuous bit distribution that optimizes decoding performance by rearranging bits based on their reliability coefficients and using a specific interleaving table to improve decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bits in DCI formats are arranged continuously in traditional LTE systems, then the structure is simple and easy to implement, but decoding performance is not optimized
Solution Approach 1:
The information block is divided into multiple sub-information blocks, where each sub-information block corresponds to a specific DCI format type. This segmentation allows different bit arrangements for different DCI formats, optimizing decoding performance for each format while maintaining manageable complexity through structured organization.
Solution Approach 2:
Different bit arrangement strategies are applied to different sub-information blocks based on their specific requirements. Each sub-information block can have its bits arranged discontinuously according to the reliability coefficients of corresponding polar code subchannels, achieving localized optimization without requiring complete reorganization of the entire bit stream.
2Productivity
If bits are interleaved based on reliability coefficients to optimize decoding, then decoding efficiency is improved, but the processing complexity increases
Solution Approach 1:
The bits are pre-interleaved according to the reliability coefficients of polar code subchannels before channel encoding. This preliminary arrangement ensures that after decoding, the bits can be directly mapped to the correct positions without requiring complex post-decoding reorganization, thus improving decoding efficiency while controlling processing complexity through advance preparation.
Solution Approach 2:
The bit positions are changed based on the reliability coefficient parameters of the polar code subchannels. By mapping bits to positions corresponding to subchannels with appropriate reliability coefficients, the system optimizes the likelihood of successful decoding while maintaining a systematic approach to the transformation.
3Reliability
If discontinuous bit distribution is used in sub-information blocks, then decoding performance is optimized, but the bit block structure becomes more complex
Solution Approach 1:
The bit block is segmented into multiple sub-information blocks, each with its own discontinuous bit distribution pattern. This segmentation allows each sub-block to achieve optimized decoding reliability through discontinuous arrangement while the overall structure maintains stability through the consistent framework of multiple organized sub-blocks.
Solution Approach 2:
Discontinuous bit distribution is applied locally within each sub-information block rather than uniformly across the entire bit block. Each sub-block can have its bits arranged according to the specific reliability requirements of its corresponding DCI format, achieving local optimization while preserving the global structural stability of the bit block composition.
Data Source
AI summary
The present disclosure discloses a method and device in user equipment and a base station for wireless communication. The base station equipment sequentially generates a first information block, performs first channel coding and transmits a first radio signal, wherein the first information block includes bits in a first sub-information block and padding bits, the first information block is used to generate a first check bit block, the first information block and the first check bit block are interleaved to generate the first bit block, and the first bit block is used as the input of the first channel coding; the bits in the first sub-information block are discontinuous in the first information block, or the padding bits are discontinuous in the first information block.