Multi-TRP HARQ-ACK Feedback Control for Overlapping PDSCH
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Solution Overview
Problem
In current NR specifications, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) feedback is not appropriately controlled when multiple transmission/reception points (TRPs) are used, leading to suppressed spatial diversity gain and communication throughput in multi-TRP scenarios.
Innovation Solution
A user terminal is equipped with a receiving section to handle PDSCHs from multiple TRPs and a control section to transmit separate or joint HARQ-ACK feedback on different or shared PUCCH/PUSCH resources, respectively, enabling flexible HARQ-ACK control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-TRP transmission is used to increase communication throughput and spatial diversity gain, then communication performance is improved, but HARQ-ACK feedback control becomes inappropriate under current NR specifications
Solution Approach 1:
The patent segments the HARQ-ACK feedback mechanism by introducing separate feedback channels for different TRPs. When multiple PDSCHs from different TRPs overlap in time-frequency resources, the system divides the feedback control into TRP-specific segments, allowing independent HARQ-ACK management for each TRP while maintaining overall system coordination. This segmentation resolves the control conflict arising from multi-TRP transmissions.
2Reliability
If multi-TRP is implemented without appropriate HARQ-ACK control, then spatial diversity gain and high rank transmission cannot be achieved, but adding complex HARQ-ACK control increases system complexity
Solution Approach 1:
The patent implements dynamic HARQ-ACK control mechanisms that adapt to multi-TRP transmission scenarios. The system dynamically selects appropriate feedback modes (joint or separate feedback) based on the specific transmission configuration and channel conditions. This dynamic approach enables spatial diversity gain and high rank transmission while avoiding the need for permanently complex control mechanisms in all scenarios.
Data Source
AI summary
A user terminal according to an aspect of the present disclosure includes a receiving section that receives a first PDSCH (Physical Downlink Shared Channel) from a first transmission/reception point (TRP), and a second PDSCH from a second TRP, the second PDSCH overlapping the first PDSCH in at least one of time and frequency resources, and a control section that performs control for transmitting both a first Hybrid Automatic Repeat request ACKnowledgement (HARQ-ACK) for the first PDSCH and a second HARQ-ACK for the second PDSCH to one of the first. TRP and the second TRP. According to an aspect of the present disclosure, the HARQ-ACK control can be preferably implemented even in a case of using the multi-TRP.