Polar Code Retransmission Using Fixed Reliable Channel Mapping
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Solution Overview
Problem
Existing polar code retransmission methods require high complexity in recalculating channel reliability during each retransmission, which hampers transmission performance and user experience.
Innovation Solution
A method that determines a polar channel sequence based on channel reliability and adjusts information bits accordingly, mapping information bits to the most reliable channels without recalculating channel reliability for each retransmission, using a coding parameter that includes the quantity of information bits and code rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel reliability is recalculated during each retransmission, then transmission reliability is improved, but system complexity increases excessively
Solution Approach 1:
The polar channel sequence is determined in advance based on initial channel reliability before retransmission begins. This preliminary determination avoids the need to recalculate channel reliability during each retransmission, thereby reducing system complexity while maintaining transmission reliability through consistent use of the pre-determined channel sequence
Solution Approach 2:
The same polar channel sequence is reused across multiple retransmissions for different transport blocks. This universal approach allows the system to handle multiple retransmission scenarios using a single predetermined sequence, reducing computational overhead and complexity while ensuring reliable transmission through proven channel assignments
2Device complexity
If the same polar channel sequence is used for all retransmissions, then retransmission complexity is reduced, but transmission performance may deteriorate
Solution Approach 1:
Different transport blocks are assigned to different positions within the predetermined polar channel sequence based on their specific requirements. This local customization within a global framework allows each transport block to utilize the most appropriate channels from the predetermined sequence, maintaining transmission performance while avoiding the complexity of dynamic recalculation
Solution Approach 2:
The system adjusts which transport blocks are transmitted on which channels by changing the assignment parameters rather than changing the channel sequence itself. This allows optimization of transmission performance through flexible block-to-channel mapping while maintaining the simplicity of a fixed channel sequence
Data Source
AI summary
Embodiments of this application provide a polar code retransmission method and apparatus, to reduce retransmission complexity and improve transmission performance. The method includes: determining a first polar channel sequence including N polar channels and reliability of each of the N polar channels; determining, based on a coding parameter for an mth data transmission, a quantity Km of information bits that need to be transmitted during the mth data transmission, where the coding parameter includes at least one of the quantity of information bits and a code rate; determining Km polar channels with highest reliability in the first polar channel sequence; determining Km information bits based on locations, of information bits that need to be transmitted during first m−1 data transmissions, in the first polar channel sequence; and mapping the Km information bits to the Km polar channels for transmission.