NR PBCH Payload Bit Ordering for Lower Polar Code Error Rates
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Solution Overview
Problem
Existing solutions for the New Radio Physical Broadcast Channel (NR PBCH) do not effectively exploit known or partially known bits during the decoding process, leading to suboptimal polar code performance in 5G wireless communication systems, particularly in high-frequency bands where signal attenuation is significant.
Innovation Solution
The method involves identifying and strategically placing payload bits with known values and introducing Parity Check (PC) bits in specific locations within the polar encoder to enhance polar code performance, using a known-bit interleaver to compensate for the effects of the CRC interleaver and improve error detection and reduction of block error rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polar coding is used for NR PBCH, then the system can achieve basic error correction capability, but the block error rate remains high especially in high-frequency bands with significant signal attenuation
Solution Approach 1:
The patent applies preliminary action by pre-placing known bits (such as frozen bits with predetermined values) at specific positions in the polar code structure before transmission. This allows the receiver to exploit these known positions during decoding to improve reliability and reduce block error rates, particularly counteracting the harmful effects of signal attenuation in high-frequency bands.
2Reliability
If standard polar encoding without bit optimization is used, then the implementation is simpler, but the decoding performance and error detection capability are suboptimal
Solution Approach 1:
The patent applies local quality by optimizing specific bit positions within the polar code structure rather than changing the entire encoding scheme. Known bits are strategically placed at particular locations to enhance error detection capability, while maintaining the overall simplicity of polar coding. This localized optimization improves reliability without proportionally increasing device complexity.
3Reliability
If full decoding process is always executed, then all possible errors can be detected, but the processing time is excessive and early termination is not achieved
Solution Approach 1:
The patent introduces known bit positions as intermediaries that facilitate early termination of the decoding process. These known bits act as reference points that allow the decoder to verify correctness incrementally, enabling early termination when errors are detected or when sufficient confidence is achieved, thus reducing processing time while maintaining error detection completeness.
Data Source
AI summary
Systems and methods are described herein that allow information carrying bits of a transmission block to be placed at higher-reliability positions prior to transmission. An exemplary method includes generating a set of payload bits to be encoded for transmission, wherein the set of payload bits includes at least one known bit, interleaving the set of payload bits to generate an interleaved set of payload bits, wherein the interleaved set includes the at least one known bit in a predetermined position in the interleaved set, providing the interleaved set to a cyclic redundancy check (CRC) encoder to generate CRC-interleaved set of payload bits, wherein the CRC-interleaved set includes the at least one known bit in a predetermined position within the CRC-interleaved set, and encoding the CRC-interleaved set for transmission to a wireless device. Associated network nodes and wireless devices are included.