Semi-Static HARQ-ACK Codebook Determination for DCI and SPS
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Solution Overview
Problem
Current communication systems face challenges in determining the semi-static HARQ-ACK codebook, which is essential for accurate HARQ feedback, leading to inconsistencies in understanding the HARQ-ACK bits between terminals and networks.
Innovation Solution
A method and terminal equipment are developed to determine the semi-static HARQ-ACK codebook based on candidate transmission occasions, including those scheduled by downlink control information (DCI) and physical downlink shared channel (PDSCH) scheduled by semi-persistent scheduling (SPS), enabling accurate feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal equipment determines the semi-static HARQ-ACK codebook based on candidate transmission occasions including both DCI-scheduled and SPS-scheduled transmissions, then the reliability of HARQ feedback is improved, but the device complexity increases due to the need to track and manage multiple scheduling types
Solution Approach 1:
The patent segments the codebook determination process by separately identifying DCI-scheduled transmission occasions and SPS-scheduled transmission occasions, then combining them into a unified semi-static HARQ-ACK codebook. This segmentation allows the terminal to systematically track different scheduling types without overwhelming complexity, as each type can be managed through its own identification rules while contributing to the overall codebook structure.
Solution Approach 2:
The patent applies preliminary action by pre-determining the semi-static HARQ-ACK codebook structure based on all possible candidate transmission occasions before actual feedback transmission. By预先 identifying and ordering all potential ACK/NACK bits corresponding to both DCI and SPS transmissions, the terminal prepares a complete codebook in advance, ensuring reliable feedback without needing to dynamically reconstruct it during transmission, thus balancing reliability with manageable complexity.
2Loss of information
If the semi-static HARQ-ACK codebook includes all candidate transmission occasions (DCI-scheduled and SPS-scheduled), then the completeness of feedback information is improved, but the loss of time increases due to the extended processing required to determine and order all HARQ-ACK bits
Solution Approach 1:
The patent uses preliminary action by establishing predetermined rules for identifying and ordering transmission occasions within the semi-static codebook. The terminal pre-defines the sequence in which DCI-scheduled and SPS-scheduled transmission occasions are considered and assigned HARQ-ACK bit positions. This preliminary structuring allows the complete codebook to be determined systematically without requiring extensive real-time processing, thus achieving information completeness while minimizing time loss.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the codebook structure based on the actual set of candidate transmission occasions. The terminal identifies which transmission occasions actually occurred and accordingly configures the HARQ-ACK codebook to include only relevant ACK/NACK bits in predetermined positions. This parameter adaptation allows the codebook to remain complete for all possible occasions while efficiently representing only the actual transmissions, reducing processing time.
Data Source
AI summary
The embodiments of the application disclose a method and terminal equipment for HARQ feedback. The method includes steps as follows. The terminal equipment determines a semi-static HARQ-ACK codebook according to a candidate transmission occasion. The semi-static HARQ-ACK codebook is used to indicate the feedback information corresponding to the candidate transmission occasion, the candidate transmission occasion comprises a transmission occasion scheduled by a DCI and/or a transmission occasion of a PDSCH scheduled by a SPS, and the transmission occasion scheduled by the DCI comprises a transmission occasion of the PDSCH scheduled by the DCI and/or a transmission occasion corresponding to SPS PDSCH deactivation information scheduled by the DCI. The terminal equipment performs HARQ feedback according to the semi-static HARQ-ACK codebook. The method and terminal equipment of the embodiments of the application can determine the semi-static HARQ-ACK codebook and accordingly perform feedback.