Code Block Group Definitions for Bursty Interference Retransmission
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Solution Overview
Problem
In next-generation wireless communication networks like 5G NR, bursty interference patterns can affect only some code blocks of a transport block, leading to inefficient retransmissions as existing methods often retransmit entire code block groups or transport blocks, rather than just the affected sections, resulting in unnecessary data transfer and reduced efficiency.
Innovation Solution
The implementation of code block group (CBG) definitions that allow for overlapping or symbol-restricted grouping of code blocks, enabling retransmission only of affected CBGs, thereby reducing the overhead of successful CBGs and improving retransmission efficiency by aligning with the duration and pattern of bursty interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If entire transport blocks or code block groups are retransmitted, then reliability of data transmission is improved, but retransmission efficiency deteriorates due to unnecessary data transfer
Solution Approach 1:
The patent segments code blocks into smaller code block groups (CBGs) that can be independently identified and retransmitted. Each CBG contains specific code blocks that can be individually addressed, allowing the system to retransmit only the affected segments rather than entire transport blocks, thus improving retransmission efficiency while maintaining reliability
Solution Approach 2:
The patent applies local quality by creating overlapping CBGs where different CBGs have different compositions of code blocks. This allows selective retransmission of specific CBGs based on which ones were affected by errors, enabling localized retransmission rather than blanket retransmission of all data, thereby improving efficiency without sacrificing reliability
2Loss of information
If code block groups are restricted to corresponding symbols, then feedback overhead is reduced, but adaptability to bursty interference patterns deteriorates
Solution Approach 1:
The patent introduces dynamic CBG configurations that can adapt to different interference scenarios. The system can dynamically select between symbol-restricted CBGs (for reduced overhead) and overlapping CBGs (for better interference adaptation), allowing the feedback mechanism to be flexible and responsive to actual channel conditions rather than being fixed
Solution Approach 2:
The patent changes the parameter of CBG structure by allowing multiple CBG definition modes (symbol-restricted vs. overlapping). This parameter change enables the system to switch between different CBG configurations based on interference characteristics, optimizing the balance between feedback overhead and adaptability to bursty interference patterns
3Productivity
If overlapping code block groups are used, then retransmission efficiency is improved by targeting affected sections, but device complexity increases
Solution Approach 1:
The patent segments the transport block into multiple CBGs with overlapping code blocks. This segmentation allows the receiver to identify and process only the specific CBGs that contain errors, reducing the amount of data that needs to be processed during retransmission and offsetting the increased complexity through selective processing
Solution Approach 2:
The patent enables the receiver to discard correctly received code blocks and only recover and process the erroneous ones within specific CBGs. This selective recovery approach reduces the overall processing burden despite the overlapping structure, as successfully received data is discarded and not reprocessed
Data Source
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.