PUCCH Resource Allocation for Multi-DCI HARQ-ACK Feedback
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Solution Overview
Problem
Current 3GPP New Radio (NR) specifications do not adequately address PUCCH resource allocation and HARQ-ACK codebook determination when multiple downlink control information (DCI) messages are scheduled in a single slot, leading to inefficiencies in aligning user equipment (UE) with the evolved Node B (gNB) for HARQ-ACK feedback.
Innovation Solution
The proposed solution enhances PUCCH resource allocation and HARQ-ACK codebook determination by defining priority orders for determining PUCCH resources based on component carrier index, PDCCH monitoring occasion index, control resource set index, starting CCE index, and search space index, ensuring accurate alignment between UE and gNB even when multiple DCIs are transmitted in a slot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple DCI messages are scheduled in a single slot, then the scheduling flexibility and throughput are improved, but the PUCCH resource allocation and HARQ-ACK codebook determination become ambiguous and unreliable
Solution Approach 1:
The patent segments the determination of PUCCH resources by introducing priority levels based on DCI format types and scheduling scenarios. Different DCI formats (e.g., format 1_0, 1_1, 0_0, 01) are assigned different priorities, and the UE determines PUCCH resources based on the highest priority DCI format detected in the slot. This segmentation resolves the ambiguity by providing a clear hierarchical decision-making process for resource allocation when multiple DCI messages are present.
2Reliability
If priority orders are defined for PUCCH resource determination, then the alignment between UE and gNB is improved, but the complexity of the specification and implementation increases
Solution Approach 1:
The patent establishes priority orders for PUCCH resource determination in advance, before the actual scheduling occurs. The specification pre-defines which DCI formats have higher or lower priority in different scenarios (e.g., format 11 has higher priority than format 10, format 00 has higher priority than format 01). This preliminary establishment of rules allows UEs to automatically determine the correct PUCCH resources without complex real-time negotiations, reducing implementation complexity while ensuring reliable alignment between UE and gNB.
Data Source
AI summary
A device, system, method, machine readable medium. The method includes: decoding a physical downlink control channel (PDCCH) from a Node B, the PDCCH scheduling a physical downlink shared channel (PDSCH); determining at least one of a control resource set (CORESET) index or a starting control channel element (CCE) index of the PDCCH; decoding the PDSCH; determining, based the at least one of the CORESET index or the CCE index, a physical uplink control channel (PUCCH) resource to carry hybrid automatic repeat request (HARQ) acknowledgment (ACK) (HARQ-ACK) feedback corresponding to the PDSCH to the Node B; and causing transmission of the HARQ-ACK feedback based on the PUCCH resource.