PUCCH Resource Scheduling for Multi-TRP HARQ Feedback
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Solution Overview
Problem
In multi-transmission/reception point (TRP) non-coherent joint transmissions, the single PUCCH resource configured for HARQ feedback delays channel state information (CSI) reporting due to non-ideal wireless backhaul, leading to performance losses and inability to support multiple PUCCH resources-based CSI feedback, and power control does not consider multi-TRP applications, affecting HARQ feedback reception.
Innovation Solution
Scheduling multiple PUCCH resources with TRP-specific precoding and transmit power control, allowing simultaneous TRP-specific HARQ feedback and enabling multiple TRPs to detect and decode HARQ feedback messages, thereby reducing or eliminating CSI reporting delay and improving power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single PUCCH resource is configured for HARQ feedback in multi-TRP non-coherent joint transmissions, then the system configuration is simple, but CSI reporting delay occurs due to non-ideal wireless backhaul and multiple PUCCH resources-based CSI feedback cannot be supported
Solution Approach 1:
The patent divides the single PUCCH resource into multiple PUCCH resources, each associated with different TRPs. This segmentation allows simultaneous transmission of HARQ feedback to multiple TRPs, eliminating the need for sequential transmission and resolving the CSI reporting delay caused by non-ideal backhaul conditions.
Solution Approach 2:
The patent introduces a new dimension of TRP-specific resource allocation by associating different PUCCH resources with different TRPs. This dimensional expansion from single-resource to multi-resource configuration enables parallel feedback paths, overcoming the time delay limitation imposed by backhaul constraints.
2Ease of operation
If a single PUCCH resource is configured for HARQ feedback, then configuration is straightforward, but the system cannot support multiple PUCCH resources-based CSI feedback
Solution Approach 1:
The patent segments the PUCCH resource configuration into TRP-specific subsets, where each subset is optimized for particular TRPs. This segmentation maintains configuration manageability while enabling versatile support for multiple TRP feedback scenarios.
Solution Approach 2:
The patent implements dynamic PUCCH resource selection based on TRP-specific conditions, allowing the system to adaptively choose appropriate resources for different TRPs. This dynamic approach enhances versatility while maintaining operational simplicity through standardized selection procedures.
3Device complexity
If traditional power control is used for PUCCH resources, then power control implementation is simple, but it does not consider multi-TRP applications and affects HARQ feedback reception
Solution Approach 1:
The patent applies TRP-specific power control parameters, where each TRP has its own power control settings optimized for its specific channel conditions. This local quality approach ensures that power control is tailored to each TRP's requirements, improving reception reliability without requiring complex centralized control.
Solution Approach 2:
The patent introduces TRP-specific power control parameters that can be independently adjusted for different TRPs. By changing the power control parameters from unified to differentiated values, the system achieves reliable HARQ feedback reception across multiple TRPs while maintaining manageable implementation complexity.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for scheduling hybrid automatic repeat request (HARQ) feedback and controlling the transmit power of the HARQ feedback. An example method generally includes generating a configuration for physical uplink control channel (PUCCH) resource sets assigned to at least one user equipment (UE), wherein each of the PUCCH resources sets comprises PUCCH resources, transmitting the configuration for the PUCCH resource sets to the at least one UE, generating an uplink control reporting indication indicating the PUCCH resources associated with downlink demodulation reference signal (DMRS) port groups, transmitting the uplink control reporting indication, to the at least one UE, for use in reporting uplink control information (UCI), and receiving at least a part of the UCI associated with at least one of the downlink DMRS port groups from the at least one UE via the PUCCH resources indicated in the uplink control reporting indication.