PUCCH Multiplexing for NR Uplink Control Channel Overlap
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Solution Overview
Problem
In next-generation wireless communication systems, there is a challenge in efficiently multiplexing multiple physical uplink control channels (PUCCHs) in a slot, particularly when semi-persistent scheduling (SPS) HARQ-ACK/SR resources overlap with non-overlapping CSI PUCCH resources, leading to alignment issues between user equipment (UE) and base stations.
Innovation Solution
The solution involves mechanisms for multiplexing multiple PUCCHs by selecting and prioritizing PUCCH resources based on availability and priority, such as multiplexing SPS HARQ-ACK/SR with the earliest or highest priority CSI PUCCH resource, and dropping lower priority CSI reports to ensure alignment and efficient UCI transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple PUCCH resources are allocated for different uplink control information types, then the system supports diverse service scenarios and control information transmission, but resource overlap and alignment issues occur between UE and base station
Solution Approach 1:
The base station pre-configures multiple PUCCH resources and their priorities before uplink control information transmission. The UE uses these pre-configured resources to multiplex different UCI types (HARQ-ACK, SR, CSI) without real-time negotiation, ensuring alignment and avoiding overlap conflicts through advance resource assignment
Solution Approach 2:
The system changes the priority parameter of PUCCH resources based on UCI type and service scenario. By dynamically adjusting priority levels (e.g., HARQ-ACK highest, then SR, then CSI), the system resolves resource conflicts and ensures proper alignment between UE and base station while supporting diverse services
2Productivity
If PUCCH resources are multiplexed to improve transmission efficiency, then resource utilization increases, but complexity of resource management and alignment increases
Solution Approach 1:
The system segments PUCCH resources by UCI type (HARQ-ACK, SR, CSI) and assigns different priority levels to each segment. This segmentation allows independent management of each UCI type's resources, reducing overall management complexity while enabling efficient multiplexing through priority-based selection
Solution Approach 2:
The base station provides a universal PUCCH resource configuration that can handle multiple UCI types (HARQ-ACK, SR, CSI) and diverse service scenarios. This multi-functional resource management approach improves transmission efficiency while keeping the management mechanism unified and not overly complex
Data Source
AI summary
Technology for a UE is disclosed. The UE can identify that a resource for a PUCCH transmission with HARQ-ACK information and/or a resource for a PUCCH associated with a SR overlap in time with two resources for respective PUCCH transmissions with two CSI reports. The UE can select a resource for a PUCCH transmission with a CSI report having a higher priority from the two resources for respective PUCCH transmissions with the two CSI reports. The UE can multiplex the HARQ-ACK information and/or the SR in the selected resource for the PUCCH transmission with the CSI report having the higher priority. The UE can encode the multiplexed HARQ-ACK information and the SR and the CSI report for transmission on the selected resource for the PUCCH transmission to a NR base station. The UE can drop the CSI report and the PUCCH resource having a lower priority.