Code Block Group Configuration for Bursty Interference Retransmission
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Solution Overview
Problem
In next-generation wireless communication networks like 5G NR, bursty interference patterns affect only some code blocks (CBs) of a transport block (TB), leading to inefficient retransmissions as existing systems retransmit entire TBs, which can be improved by retransmitting only affected code block groups (CBGs).
Innovation Solution
Retransmitting only the affected CBGs containing at least one unsuccessfully received CB, while omitting successfully received CBGs, to enhance retransmission efficiency and reduce unnecessary retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If entire transport blocks are retransmitted, then reliability is improved, but transmission efficiency deteriorates
Solution Approach 1:
The transport block is divided into multiple code blocks, which are then grouped into code block groups. This segmentation allows the system to identify and retransmit only the specific CBGs containing erroneous code blocks, rather than retransmitting the entire transport block. The patent implements this by dividing TB into CBs, grouping them into CBGs, and using CBG-level HARQ feedback to target retransmissions.
Solution Approach 2:
The patent extracts only the affected code block groups from the transport block for retransmission. By identifying which specific CBGs contain erroneous CBs through HARQ feedback, the system extracts and retransmits only those specific portions rather than the entire TB, thereby improving efficiency while maintaining reliability.
2Productivity
If code block groups are used for retransmission, then transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the transport block into code blocks and groups them into code block groups, introducing a hierarchical structure (TB→CB→CBG). This segmentation enables finer-grained control over retransmissions but increases system complexity by requiring additional grouping logic and CBG-level feedback mechanisms.
Solution Approach 2:
The patent changes the granularity parameter of HARQ feedback from transport block level to code block group level. This parameter change enables more precise retransmission control but requires modifications to the HARQ feedback mechanism and increases processing complexity at both transmitter and receiver.
3Productivity
If CBG-level HARQ feedback is implemented, then retransmission efficiency is improved, but feedback overhead increases
Solution Approach 1:
The patent segments HARQ feedback from transport block level to code block group level, allowing the receiver to provide feedback on individual CBGs rather than the entire TB. This enables the transmitter to identify exactly which portions need retransmission, improving retransmission efficiency but increasing feedback message size and processing overhead.
Solution Approach 2:
The patent implements CBG-level HARQ feedback where the receiver sends acknowledgment information for each code block group individually. This feedback mechanism enables precise identification of erroneous CBGs and triggers targeted retransmissions, improving overall system efficiency while requiring enhanced feedback processing capabilities.
Data Source
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AI summary
Aspects of the present disclosure provide various apparatuses and methods for retransmitting code blocks (CBs) and code block group (CBG) definitions that can improve CBG-based data retransmission efficiency. When an interference pattern is bursty and does not align with CBG or symbol boundary, the disclosed CBG definitions can reduce or avoid retransmission of successfully received CBs along with the CBs that need to be retransmitted.