Multi-TRP HARQ-ACK Control via PUCCH Resource Segmentation
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Solution Overview
Problem
Current Next-Generation Radio (NR) specifications do not adequately account for multiple transmission/reception points (TRPs), leading to inadequate Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) control, which prevents the achievement of space diversity gain and high-rank transmission, thereby suppressing communication throughput.
Innovation Solution
A user terminal that receives downlink shared channels from multiple TRPs and employs a control section to identify correspondence relationships among Physical Uplink Control Channel (PUCCH) resources, groups for TRPs, and spatial relation information (SRI), enabling suitable HARQ-ACK control even in multi-TRP scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current NR specifications are followed, then device complexity is reduced, but HARQ-ACK control becomes inadequate in multi-TRP scenarios
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple groups, where each group corresponds to a specific TRP. This segmentation allows independent control and optimization of HARQ-ACK feedback for each transmission point, resolving the contradiction by enabling reliable multi-TRP control without requiring a complete redesign of the specification framework.
Solution Approach 2:
The patent introduces a new dimension of TRP grouping into the existing HARQ-ACK feedback mechanism. By organizing PDSCH receptions into TRP groups and assigning separate codebook groups, the system adds organizational structure without fundamentally changing the underlying feedback protocol, thus improving reliability while maintaining manageable complexity.
2Productivity
If multiple TRPs are used for downlink transmission, then communication throughput increases, but HARQ-ACK control becomes inadequate
Solution Approach 1:
The patent divides the HARQ-ACK codebook into multiple groups corresponding to different TRPs. Each group independently manages feedback for PDSCH receptions from its associated TRP, enabling reliable control while supporting multiple TRPs for enhanced throughput.
Solution Approach 2:
The patent performs preliminary grouping of PDSCH receptions by TRP before generating HARQ-ACK feedback. This pre-organization of data into TRP-specific groups enables the system to handle multiple TRPs effectively, ensuring both throughput enhancement and reliable control.
3Productivity
If space diversity gain and high-rank transmission are achieved through multiple TRPs, then communication throughput increases, but HARQ-ACK control fails
Solution Approach 1:
The patent segments the HARQ-ACK feedback into TRP-specific groups, ensuring that feedback information for each TRP is independently managed and transmitted. This prevents information loss by organizing feedback in a structured manner that accommodates multiple TRPs and their associated spatial diversity and high-rank transmission capabilities.
Solution Approach 2:
The patent adds the TRP grouping dimension to the HARQ-ACK feedback structure, allowing the system to maintain complete feedback information across multiple TRPs. This organizational approach ensures that space diversity gain and high-rank transmission benefits are preserved without compromising feedback integrity.
Data Source
AI summary
A user terminal according to an aspect of the present disclosure includes a receiving section that receives downlink shared channels (Physical Downlink Shared Channels (PDSCHs)) from a plurality of transmission/reception points (TRPs), and a control section that identifies, based on a correspondence relationship among Physical Uplink Control Channel (PUCCH)) resources, groups for TRPs, and groups for spatial relation information (SRI), the TRP and SRI associated with a PUCCH for the PDSCHs. According to an aspect of the present disclosure, HARQ-ACK control can be suitably implemented even in a case where multiple TRPs are used.