Polar Code Bit Mapping for Reliable Broadcast Signaling
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Solution Overview
Problem
Existing polar coding methods for physical broadcast channels do not fully optimize the transmission reliability of broadcast signaling, leaving room for improvement.
Innovation Solution
A polar encoding method that determines the payload of broadcast signaling includes D cyclic redundancy check (CRC) bits and M predictable information bits, maps these bits to appropriate reliability positions in a polar code, and performs polar encoding to obtain encoded bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If predictable information bits are mapped to high-reliability positions and CRC bits to low-reliability positions in polar code, then transmission reliability of broadcast signaling is improved, but the optimal allocation of reliability resources is not achieved
Solution Approach 1:
The patent applies preliminary action by pre-determining the mapping relationship between information bits and polar code positions based on reliability analysis before actual encoding. The encoder pre-calculates which positions in the polar code are high-reliability and low-reliability positions, and pre-establishes the mapping rule that predictable information bits should go to low-reliability positions while CRC bits should go to high-reliability positions. This preliminary preparation enables optimal reliability resource allocation without increasing real-time coding complexity.
Solution Approach 2:
The patent changes the parameter of bit mapping allocation by introducing reliability-based position assignment. Instead of uniform or fixed mapping, the system dynamically adjusts which information bits are assigned to which code positions based on their reliability characteristics. The mapping parameter is changed from static to reliability-dependent, allowing predictable information bits to occupy low-reliability positions and CRC bits to occupy high-reliability positions, thereby optimizing transmission reliability.
2Reliability
If uniform mapping is used for all information bits in polar code, then coding simplicity is maintained, but transmission reliability of broadcast signaling is not optimized
Solution Approach 1:
The patent applies local quality by making different parts of the information bit sequence receive different treatment based on their characteristics. Specifically, predictable information bits are differentiated from other information bits and assigned to different code positions (low-reliability positions) compared to non-predictable bits (high-reliability positions). This localized differentiation optimizes reliability for specific bit types while maintaining overall coding simplicity through a systematic mapping rule.
Solution Approach 2:
The patent changes the mapping parameter from uniform to differentiated based on bit type. The mapping function is modified to consider the predictability characteristic of information bits, creating a reliability-aware mapping parameter that assigns different positions to different bit types. This parameter change enables optimized transmission reliability while keeping the coding process straightforward through predefined mapping rules.
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.