Polar Coding 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 are mapped to high-reliability positions, then transmission reliability is improved, but the structure becomes more complex
Solution Approach 1:
The information bits are segmented into two distinct groups: predictable information bits and other information bits. This segmentation allows different mapping strategies to be applied to different bit types, with predictable bits being mapped to high-reliability positions while other bits are mapped to remaining positions, thereby improving transmission reliability without requiring complete remapping of all bits
Solution Approach 2:
Different reliability requirements are applied locally to different types of information bits. Predictable information bits, which are more susceptible to errors, are assigned to high-reliability positions in the polar code, while other bits are assigned to remaining positions. This local differentiation of quality ensures that critical bits receive enhanced protection without unnecessarily complicating the overall mapping process
2Reliability
If all information bits are treated equally in mapping, then the encoding process is simpler, but transmission reliability is reduced
Solution Approach 1:
Before the actual polar encoding process, a preliminary classification and mapping step is performed where predictable information bits are identified and assigned to high-reliability positions. This preliminary action ensures that bits requiring higher reliability are protected beforehand, and the subsequent encoding process can proceed with this optimized mapping in place
Solution Approach 2:
The reliability parameter is changed differently for different types of information bits. By identifying predictable information bits and assigning them to high-reliability positions with different characteristics than standard positions, the patent modifies the reliability parameter locally to improve overall broadcast channel reliability while maintaining manageable 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.