Polar Bit Mapping for Reliable Broadcast Channel Coding
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Solution Overview
Problem
Existing polar coding methods for physical broadcast channels do not adequately enhance the transmission reliability of broadcast signaling.
Innovation Solution
A polar encoding method that determines the payload of broadcast signaling includes cyclic redundancy check (CRC) bits and predictable information bits, maps these bits to appropriate reliability levels within a polar code, and performs polar encoding on the mapped bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polar coding is used for physical broadcast channel, then encoding and decoding complexity is low, but transmission reliability of broadcast channel is insufficient
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different bit positions within the polar code. Specifically, it identifies and processes reliable bit positions versus unreliable bit positions separately, applying different mapping strategies for CRC bits and predictable information bits based on their respective reliability requirements. This localized differentiation enhances overall transmission reliability without requiring complete redesign of the coding system.
Solution Approach 2:
The patent implements preliminary action by pre-identifying and pre-processing CRC bits and predictable information bits before the actual polar encoding process. The method determines which bits fall into reliable versus unreliable positions in advance, and performs appropriate mapping operations beforehand. This preliminary classification and processing reduces the complexity of the main encoding operation while ensuring optimal reliability enhancement.
2Reliability
If bit mapping is performed without considering reliability positions, then encoding process is simple, but transmission reliability cannot be enhanced
Solution Approach 1:
The patent applies segmentation by dividing the polar code bits into distinct categories based on reliability: reliable bit positions and unreliable bit positions. It further segments the information to be encoded into CRC bits and predictable information bits. This multi-level segmentation allows each segment to be processed with appropriate mapping strategies, enhancing reliability while keeping the mapping process structured and manageable rather than overly complex.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the mapping of different bit types based on their reliability parameters. Specifically, it changes the mapping destination for CRC bits versus predictable information bits according to their respective reliability requirements and the identified reliable/unreliable positions in the polar code. This parameter-based adaptive mapping enhances transmission reliability while maintaining a systematic approach that avoids excessive 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.