Multi-Cell HARQ Feedback Through Slot-Spacing Sets
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Solution Overview
Problem
The challenge of implementing HARQ feedback when one DCI schedules PDSCHs on multiple cells is not adequately addressed in existing technologies, leading to inefficiencies in signaling overhead management.
Innovation Solution
A method and device that enable HARQ feedback by determining a first set indicating the number of slots between PDSCH and PUCCH, and processing this set using a second spacing to obtain a second set, which is used to determine the reception occasion of PDSCHs corresponding to a static HARQ codebook for each cell, thereby facilitating HARQ feedback across multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If one DCI schedules PDSCHs on multiple cells, then signaling overhead is reduced, but HARQ feedback implementation becomes complex
Solution Approach 1:
The patent segments the HARQ feedback process by determining reception occasions for PDSCH on each cell separately using cell-specific parameters (K0, K1, K2) and then combining them through a unified determination process. The feedback is divided into cell-specific HARQ-ACK information that is aggregated, allowing complex multi-cell feedback to be handled through structured segmentation of the problem space.
Solution Approach 2:
The patent creates a universal HARQ feedback mechanism that works for both single-cell and multi-cell scheduling scenarios. By establishing a unified method to determine reception occasions using the same parameters (K0, K1, K2) and DCI format regardless of the number of cells, the system achieves multi-functionality where the same feedback mechanism serves both single-cell and multi-cell operations.
2Ease of operation
If HARQ feedback is dedicated for one DCI to schedule a PDSCH on one cell, then feedback implementation is simple, but signaling overhead increases
Solution Approach 1:
The patent merges multiple cell-specific HARQ feedback processes into a unified feedback mechanism. By combining the reception occasion determination for multiple cells and aggregating the HARQ-ACK information, the system reduces the total signaling overhead while maintaining the operational simplicity of dedicated feedback through the use of a unified DCI format and aggregated feedback structure.
3Productivity
If one DCI schedules PDSCHs on multiple cells, then resource allocation efficiency is improved, but determining reception occasions for HARQ feedback becomes difficult
Solution Approach 1:
The patent applies preliminary action by pre-defining the reception occasions for PDSCH on each cell using the parameters K0 (offset between DCI and PDSCH), K1 (offset between PDSCH and HARQ-ACK), and K2 (offset between DCI and HARQ-ACK). These preliminary determinations for each cell are then aggregated to establish the overall reception occasions, making the detection and measurement process systematic rather than ad hoc.
Solution Approach 2:
The patent uses the parameters K0, K1, and K2 as intermediaries to bridge the DCI scheduling information and the HARQ feedback reception occasions. These intermediary parameters serve as the connecting elements that translate the multi-cell scheduling decisions into specific reception occasion determinations, simplifying the overall process by breaking it into manageable parameter-based steps.
Data Source
AI summary
A HARQ feedback method and device are provided, which relates to the field of communications technology. The method is performed by a terminal and includes: receiving downlink control information (DCI), the DCI scheduling PDSCHs of multiple cells, the DCI indicating a number of slots between a latest PDSCH in the scheduled PDSCHs of the cells and a PUCCH; determining a first set, the first set comprising a first spacing, the first spacing being used to indicate a number of slots between the PDSCH and the PUCCH; processing the first set according to the second spacing to obtain the second set, the second spacing being used to indicate a number of slots between the DCI and the PDSCH; determining, according to the second set, a reception occasion of the PDSCH that is scheduled by the DCI and corresponds to a static HARQ codebook of each cell.