Multi-Panel UE HARQ Feedback Coordination via DCI
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently scheduling and coordinating the use of multiple antenna panels for reliable and efficient data transmission and acknowledgment feedback, leading to suboptimal performance in terms of reliability, speed, and bandwidth.
Innovation Solution
The system employs a method where a base station transmits downlink control information (DCI) to schedule physical downlink shared channel (PDSCH) and indicates the number of physical uplink control channel (PUCCH) repetitions for acknowledgment (ACK)/negative ACK (NACK) feedback, allowing user equipment (UE) to receive and transmit data through multiple panels, enabling coordinated feedback and improved communication reliability and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antenna panels are used for data transmission and acknowledgment feedback, then reliability and bandwidth are improved, but device complexity and coordination difficulty increase
Solution Approach 1:
The patent divides the acknowledgment feedback into multiple separate PUCCH transmissions, with each transmission carrying feedback for a specific panel or panel group. This segmentation allows the base station to receive and process feedback from multiple panels independently, improving reliability while managing complexity through structured division of feedback channels.
Solution Approach 2:
The patent introduces a new dimension of panel identification by incorporating a panel ID field in DCI formats and associating specific panels with specific PUCCH resources. This dimensional approach to organizing multi-panel feedback enables systematic coordination without exponentially increasing complexity, as each panel can be independently tracked and managed.
2Reliability
If multiple PUCCH repetitions are used for ACK/NACK feedback, then feedback reliability is improved, but processing workload and time requirements increase
Solution Approach 1:
The base station pre-configures multiple PUCCH resources and associates them with specific panels through RRC signaling before actual data transmission occurs. This preliminary configuration allows the UE to immediately use the pre-established feedback channels without additional processing delay, achieving reliable multi-panel feedback while minimizing time loss.
Solution Approach 2:
Each panel independently generates and transmits its own acknowledgment feedback through dedicated PUCCH resources. This self-service approach allows parallel processing of feedback from multiple panels without requiring centralized sequential handling, thereby improving feedback reliability while reducing overall processing time through concurrent operations.
Data Source
AI summary
Aspects presented herein may improve the accuracy and/or the efficiency of HARQ feedback for a UE communicating with a base station or multiple TRPs using multiple antenna panels. In one aspect, an apparatus receives DCI scheduling a PDSCH to be received by a first plurality of panels and indicating a second plurality of PUCCH repetitions for providing ACK/NACK feedback. The apparatus receives the PDSCH through the first plurality of panels. The apparatus transmits ACK/NACK feedback in the indicated second plurality of PUCCH repetitions based on the received PDSCH.