Flexible Response Indication for HARQ Code Block Groups
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Solution Overview
Problem
In communications systems using code block groups (CBGs) for data transmission, the existing response indication methods lack flexibility, leading to a poor balance between indication precision and resource efficiency, particularly in hybrid automatic repeat request (HARQ) processes.
Innovation Solution
The proposed solution involves using different indication manners for responses sent at different times to indicate the transmission results of target data, allowing for flexible adjustment of response indications to ensure precision while reducing transmission resources, by varying the number and arrangement of indication bits and data blocks indicated by each bit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single response indication manner is used for all transmissions, then the system is simple to implement, but the flexibility and adaptability of the response indication method is poor
Solution Approach 1:
The patent implements dynamic response indication by allowing the receiving device to select from multiple indication manners (full indication, partial indication, or no indication) based on the actual transmission scenario and channel conditions. This dynamic selection mechanism enables the system to adapt flexibly to different situations without requiring a completely fixed complex structure for all possible scenarios.
Solution Approach 2:
The patent applies local quality by allowing different indication manners to be used for different code block groups (CBGs) within the same transmission. Specifically, the receiving device can selectively indicate which CBGs were received correctly and which require retransmission, rather than applying a uniform indication method to all CBGs. This localized differentiation improves overall system flexibility.
2Measurement precision
If more indication bits are used in the response payload, then the indication precision is improved, but the transmission resources of the response increase
Solution Approach 1:
The patent implements partial indication by allowing the receiving device to send only the necessary portion of feedback information based on actual needs. When full retransmission is required, minimal indication is sent; when only specific CBGs need retransmission, selective indication is sent. This partial action approach provides sufficient indication precision for each scenario while minimizing the total transmission resources consumed by responses.
Solution Approach 2:
The patent changes the parameter of indication bit quantity dynamically based on the transmission scenario. The receiving device adjusts the number of indication bits in the response payload according to factors such as channel conditions, transmission importance, and which specific CBGs were received correctly. This parameter adjustment enables the system to maintain adequate indication precision while reducing unnecessary transmission overhead.
3Reliability
If the entire TB is retransmitted when a small part is received incorrectly, then the transmission reliability is maintained, but the transmission resources are wasted
Solution Approach 1:
The patent divides the transport block (TB) into multiple code block groups (CBGs) and implements independent indication and retransmission for each CBG. When only certain CBGs are received incorrectly, the receiving device sends selective indication for those specific CBGs, and the sending device retransmits only the indicated CBGs rather than the entire TB. This segmentation approach maintains transmission reliability for affected segments while significantly reducing retransmission resource consumption.
Data Source
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AI summary
A communication method and a communications device are disclosed. In this solution, a first device in a communications system separately sends, to a second device, responses used to indicate a transmission result of target data: a first response and a second response, wherein an indication manner of the first response is different from an indication manner of the second response. This solution can improve flexibility of a response indication manner. Therefore, the communications system can flexibly adjust indication manners of responses sent at different times to ensure indication precision of the responses while reducing transmission resources of the responses.