Multi-Codeword HARQ Feedback With Adaptive CBG Granularity
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in hybrid automatic repeat request (HARQ) feedback for code block group (CBG)-based transmissions, leading to unnecessary signaling overhead, computational resource waste, and increased latency due to uniform feedback granularity for transport blocks with varying parameters.
Innovation Solution
Implementing enhanced feedback mechanisms for UEs and network entities to provide differentiated feedback quantities for transport blocks, allowing for transport block-based feedback with one bit and CBG-based feedback with a configurable number of bits based on configured threshold quantities, optimizing feedback according to transport block parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform feedback granularity is used for all transport blocks, then implementation simplicity is maintained, but signaling overhead increases and spectral efficiency decreases
Solution Approach 1:
The patent applies local quality by differentiating feedback granularity based on transport block characteristics. Specifically, CBG-based feedback with higher granularity is applied to transport blocks where it benefits performance, while transport block-based feedback with lower granularity is applied to other blocks, optimizing the balance between accuracy and overhead for each individual block.
Solution Approach 2:
The patent implements dynamics by making feedback granularity adaptive rather than static. The feedback mechanism dynamically adjusts between CBG-based and transport block-based approaches based on transport block parameters such as size, modulation and coding scheme, and channel conditions, allowing the system to optimize performance under varying operational conditions.
2Measurement precision
If CBG-based feedback is used for all transport blocks, then measurement precision improves, but signaling overhead and computational resource consumption increase
Solution Approach 1:
The patent applies local quality by selectively applying CBG-based feedback precision only to transport blocks where it provides measurable benefit, such as larger blocks or those with specific MCS configurations. For other transport blocks, particularly smaller ones, the patent uses coarser transport block-based feedback, thereby avoiding unnecessary precision that would increase feedback bit quantity without proportional performance gains.
Solution Approach 2:
The patent changes the feedback granularity parameter based on transport block parameters. By monitoring transport block characteristics such as size, MCS index, and code block group configuration, the system dynamically adjusts the feedback precision level, transitioning between CBG-based and transport block-based feedback modes to optimize the trade-off between measurement precision and feedback overhead.
3Productivity
If differentiated feedback quantities are implemented for transport blocks, then spectral efficiency improves, but device complexity increases
Solution Approach 1:
The patent segments the feedback processing into distinct pathways based on transport block characteristics. By dividing transport blocks into categories that require different feedback granularities, the system can apply simplified processing rules to each segment rather than implementing complex unified processing, thereby reducing overall device complexity while maintaining spectral efficiency benefits.
Solution Approach 2:
The patent reduces device complexity through dynamic decision-making based on pre-defined criteria. Rather than implementing complex algorithms to determine optimal feedback granularity, the system uses dynamic but rule-based selection that adapts to transport block parameters, achieving spectral efficiency improvements through straightforward conditional logic rather than complex processing.
4Quantity of substance
If transport block-based feedback with one bit is used, then signaling overhead is reduced, but retransmission efficiency decreases
Solution Approach 1:
The patent applies local quality by using transport block-based feedback with one bit for transport blocks where coarse granularity is sufficient, such as smaller blocks or those in favorable channel conditions. For transport blocks where fine-grained retransmission control is beneficial, the patent applies CBG-based feedback, thereby optimizing retransmission efficiency locally for each block while keeping overall signaling overhead low.
Solution Approach 2:
The patent changes feedback granularity based on transport block parameters to optimize retransmission efficiency. By adjusting the feedback bit quantity according to transport block characteristics such as size, MCS, and channel quality, the system ensures that transport blocks requiring precise retransmission control receive CBG-based feedback, while others use compact one-bit feedback, thereby maintaining high retransmission efficiency across diverse traffic conditions.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may receive a grant of resources scheduling a first transport block and a second transport block during a reception occasion on a component carrier. The UE may receive the first transport block and the second transport block during the reception occasion. The UE may transmit a feedback message associated with hybrid automatic repeat request feedback. The feedback message may include a first quantity of feedback bits for the first transport block and a second quantity of feedback bits for the second transport block, where the first quantity of feedback bits is different from the second quantity of feedback bits.