HARQ-ACK Codebook K1 Set Extension for Multi-Slot Scheduling
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Solution Overview
Problem
In wireless communication systems, especially in new radio (NR) scenarios, the existing Type 1 HARQ-ACK codebook fails to completely contain all slots of PDSCHs scheduled by DCI due to the introduction of multi-slot PDSCH scheduling, leading to incomplete HARQ-ACK feedback.
Innovation Solution
A method is provided to determine an extended K1 set for the Type 1 HARQ-ACK codebook by adjusting the K1 set based on the K0 set and HARQ feedback bundling value N, ensuring that all PDSCHs scheduled by DCI can be fed back within a single HARQ-ACK PUCCH resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing Type 1 HARQ-ACK codebook is used, then the codebook size is fixed and feedback is simple, but the codebook fails to contain all slots of PDSCHs scheduled by DCI in multi-slot scheduling scenarios
Solution Approach 1:
The patent applies dynamics by transforming the static, fixed K1 set into a dynamic, extended K1 set that adapts to multi-slot PDSCH scheduling requirements. The extension mechanism allows the codebook to flexibly incorporate additional time slot information when multiple PDSCHs are scheduled, ensuring complete HARQ-ACK feedback while maintaining the underlying fixed codebook structure for simplicity.
Solution Approach 2:
The patent segments the K1 set into a basic K1 set and an extended K1 set. The basic K1 set handles single-slot scheduling, while the extended K1 set is constructed by adding offset values to accommodate multi-slot PDSCH scheduling. This segmentation allows the system to maintain simplicity for common cases while providing extended capability when needed.
2Reliability
If the K1 set is extended to accommodate multi-slot PDSCH scheduling, then complete HARQ-ACK feedback is achieved, but the determination process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-defining the extension method for constructing the extended K1 set. The network device determines the extended K1 set in advance based on the basic K1 set and configured parameters, and notifies the terminal of the extension method. This allows both devices to efficiently determine the codebook without complex real-time calculations, maintaining ease of operation while achieving complete feedback.
3Productivity
If a fixed K1 set is used, then the feedback window is well-defined, but PDSCHs in multi-slot scheduling cannot be completely contained in the feedback window
Solution Approach 1:
The patent uses dynamics to extend the feedback window coverage by adapting the K1 set to multi-slot scheduling requirements. The extended K1 set dynamically adjusts the time slot offsets to ensure all PDSCHs scheduled by DCI are contained within the feedback window, preventing information loss while maintaining efficient feedback processing.
Data Source
AI summary
A method for determining or decoding a HARQ-ACK codebook, includes: determining a second K1 set in a second scheduling method based on a first K1 set in a first scheduling method, a K0 set in the second scheduling method, and an HARQ feedback bundling value N; and determining the HARQ-ACK codebook based on the second K1 set; in the first scheduling method, one piece of downlink control information (DCI) schedules one PDSCH; and in the second scheduling method, one piece of DCI schedules a plurality of PDSCHs.