Separate PUCCH Feedback for Semi-Persistent Scheduling Wireless
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Solution Overview
Problem
In wireless communication systems, the overlap of PUCCH resources for separate HARQ feedback transmissions in different CORESET pools can lead to reduced reliability and increased latency, as existing methods do not effectively manage non-overlapping uplink resources for separate feedback transmissions.
Innovation Solution
The implementation of separate PUCCH resource lists for each CORESET pool, allowing the UE to select non-overlapping uplink resources for feedback transmissions based on control signaling, ensuring that each uplink resource is configured to be non-overlapping in the time domain, thereby supporting reliable and low-latency HARQ-Ack transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate PUCCH resources are allocated for different CORESET pools, then reliability of HARQ feedback is improved, but resource configuration complexity increases
Solution Approach 1:
The PUCCH resource set is segmented into multiple subsets, where each subset corresponds to a specific CORESET pool. This segmentation allows the UE to select appropriate PUCCH resources based on which CORESET pool the PDSCH belongs to, thereby avoiding resource conflicts and improving HARQ feedback reliability while maintaining manageable configuration complexity through structured organization.
Solution Approach 2:
Different PUCCH resource configurations are applied locally to different CORESET pools based on their specific requirements. Each CORESET pool can have its own dedicated PUCCH resource subset with optimized parameters, allowing tailored resource allocation that improves reliability without requiring complete reconfiguration of all PUCCH resources.
2Loss of time
If non-overlapping PUCCH resources are enforced in time domain, then latency is reduced, but resource allocation flexibility decreases
Solution Approach 1:
PUCCH resources are divided into multiple non-overlapping subsets in the time domain, each associated with a specific CORESET pool. This segmentation ensures that feedback transmissions from different pools occur at different times, eliminating latency caused by resource conflicts while maintaining allocation flexibility through the structured subset organization that allows independent configuration of each subset.
Solution Approach 2:
The system dynamically selects which PUCCH resource subset to use based on which CORESET pool the PDSCH belongs to. This dynamic selection mechanism allows the system to adapt resource allocation to specific transmission scenarios while ensuring non-overlapping timing, thus reducing latency without sacrificing overall allocation flexibility.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may support separate feedback for multiple semi-persistent scheduling (SPS) configurations. The UE may be configured with a set of uplink resources that includes a first subset of uplink resources associated with a first control resource set (CORESET) pool and a second subset of uplink resources associated with a second CORESET pool. The UE may receive first and second SPS downlink transmissions associated with the first and second CORESET pools, respectively. The UE may select a first uplink resource from the first subset of uplink resources and a second uplink resource from the second subset of uplink resources based on the SPS downlink transmissions or a payload of a respective feedback transmission. The UE may transmit one or more feedback transmissions in the first uplink resource or the second uplink resource.