Polar Code Bit Mapping for Reliable Broadcast Signaling
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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, leading to suboptimal mapping and encoding.
Innovation Solution
A method that determines the payload of broadcast signaling includes CRC bits and predictable information bits, maps these bits to low-reliability and high-reliability information bits respectively within a polar code, and performs polar encoding to enhance transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If predictable information bits and CRC bits are mapped to information bits of polar code without differentiation, then the mapping process is simple, but the transmission reliability is suboptimal
Solution Approach 1:
The patent applies local quality by differentiating the mapping positions for predictable information bits and CRC bits within the polar code structure. Specifically, predictable information bits are mapped to first information bits while CRC bits are mapped to second information bits, creating different reliability characteristics for different parts of the code. This resolves the contradiction by improving transmission reliability through differentiated mapping while maintaining relatively simple mapping complexity through systematic position assignment.
2Reliability
If all information bits in polar code are treated equally, then the encoding process is straightforward, but valuable information bits may be mapped to low-reliability positions
Solution Approach 1:
The patent implements local quality by assigning different mapping strategies to different types of information bits. Predictable information bits are specifically mapped to first information bits of the polar code, while other information bits are mapped to second information bits. This ensures that valuable predictable information bits receive appropriate protection while maintaining a systematic encoding process that does not excessively increase encoding complexity.
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.