Polar Bit Placement for Broadcast Signaling Reliability
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Solution Overview
Problem
Current polar coding methods for physical broadcast channels do not fully optimize the reliability of data transmission, as they do not effectively differentiate between predictable and unpredictable information bits and cyclic redundancy check (CRC) bits in terms of reliability, leading to suboptimal encoding and decoding processes.
Innovation Solution
A polar encoding method that maps predictable information bits to low-reliability positions and CRC bits to high-reliability positions within the polar code, improving the reliability of broadcast signaling by prioritizing bit placement based on ascending order of subchannel reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If predictable information bits and CRC bits are mapped to the same reliability positions in polar code, then the encoding process is simple, but the transmission reliability of broadcast signaling is insufficient
Solution Approach 1:
The patent applies local quality by differentiating the mapping positions for different bit types based on their reliability requirements. Predictable information bits are mapped to low-reliability positions (higher index values) while CRC bits are mapped to high-reliability positions (lower index values) in the polar code, creating localized quality differences that optimize overall transmission reliability
Solution Approach 2:
The patent segments the information bits into distinct categories (predictable information bits and CRC bits) and assigns them to different reliability positions in the polar code. This segmentation allows the system to treat different bit types differently, with predictable bits occupying less critical positions and CRC bits occupying more critical positions for error detection
2Reliability
If all information bits are treated equally in polar code mapping, then the mapping process is straightforward, but the error resistance of broadcast signaling is reduced
Solution Approach 1:
The patent implements local quality by creating distinct mapping strategies for different bit types. Predictable information bits are systematically mapped to low-reliability positions using one mapping rule, while CRC bits are mapped to high-reliability positions using a different mapping rule, thereby optimizing error resistance through localized quality differentiation
3Reliability
If CRC bits are mapped to low-reliability positions, then the mapping is simple, but the detection capability of error detection is weakened
Solution Approach 1:
The patent applies preliminary action by pre-determining the mapping positions for CRC bits in the polar code before encoding. By systematically assigning CRC bits to high-reliability positions (lower index values) based on the polar code structure, the system ensures optimal error detection capability is established in advance, allowing receivers to effectively detect errors without requiring complex real-time adjustments
Data Source
AI summary
Embodiments of this application provide a method for coding in a wireless communication network. A communication device interleave a first bit sequence to obtain a first interleaved sequence having sequence number starting with a sequence number of 0, wherein the first bit sequence comprises bits for indicating timing, wherein the bits for indicating timing comprises a set of bits for indicating synchronization signal block index (SSBI); wherein the set of bits for indicating SSBI are placed in positions indicated by sequence numbers of 2, 3 and 5 in the first interleaved sequence. The devices add d first CRC bits on the first interleaved sequence to obtain a second bit sequence, interleave on the second bit sequence according to an interleave pattern to obtain a second interleaved sequence, and polar encode the second interleaved sequence to obtain the encoded sequence.