HARQ Code Word Decoupling for Balanced Payload Retransmission
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Solution Overview
Problem
Current multiple code word retransmission solutions in wireless communication networks, such as 5G NR, do not provide sufficient speed or customization for efficient operation, leading to inefficient retransmissions where payload is unevenly distributed among code words, affecting performance.
Innovation Solution
Implementing a hybrid automatic repeat request (HARQ) process that decouples code words from original transport blocks, allowing code block groups or code blocks to change code words for retransmission, thereby proportionately balancing payload size across code words for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current multiple code word retransmission solutions are used, then retransmission capability is provided, but payload distribution is uneven and efficiency is reduced
Solution Approach 1:
The patent segments the transport block into code block groups (CBGs) that can be independently allocated to different code words during retransmission. This segmentation allows flexible distribution of payload across multiple code words, ensuring balanced load allocation and improving retransmission efficiency by preventing any single code word from becoming overloaded.
2Adaptability or versatility
If code words are coupled with original transport blocks, then transmission structure is simplified, but retransmission flexibility is limited
Solution Approach 1:
The patent implements dynamic code word allocation where code block groups can be reassigned to different code words during retransmission based on current channel conditions and payload requirements. This dynamic approach allows the system to adapt to varying transmission conditions while maintaining manageable complexity through structured allocation rules.
3Speed
If payload is concentrated in fewer code words, then transmission speed increases, but reliability decreases due to uneven distribution
Solution Approach 1:
The patent applies local quality by distributing payload strategically across different code words based on their individual characteristics and current transmission conditions. Each code word receives an appropriate portion of the payload tailored to its performance characteristics, optimizing both speed and reliability by ensuring no single code word becomes a bottleneck while maintaining overall transmission efficiency.
Data Source
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AI summary
A user equipment (UE) in communication with a base station may utilize multiple code word (MCW) transmissions within a hybrid automatic repeat request (HARQ) process. An original transmission has a first transport block allocated to a first code word and a second transport block allocated to a second code word. Each transport block includes multiple code blocks grouped into code block groups. The UE receives a negative acknowledgement indicating that a subset of the code block groups were not successfully received. The UE retransmits the subset of the code block groups on at least one of the first code word or the second code word in a retransmission in the HARQ process. At least one code block is retransmitted on a different code word in the retransmission than in the original transmission.