Multi-TRP HARQ-ACK Control for Uplink Feedback
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Solution Overview
Problem
In next-generation mobile communication systems, specifically in the New Radio (NR) specifications, the use of multiple transmission/reception points (TRPs) leads to inadequate control of Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) feedback, resulting in suppressed communication throughput and inability to achieve spatial diversity gain and high rank transmission.
Innovation Solution
A user terminal is designed to receive Physical Downlink Shared Channels (PDSCH) from multiple TRPs and control the transmission of HARQ-ACK feedback independently or jointly on separate or shared Physical Uplink Control Channel (PUCCH) resources, allowing for flexible HARQ-ACK control even with multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-TRP transmission is implemented, then communication throughput and spatial diversity gain can be improved, but HARQ-ACK feedback control becomes inadequate and complex
Solution Approach 1:
The patent segments the HARQ-ACK feedback control by introducing separate feedback mechanisms for different TRPs. Each TRP can independently receive and process HARQ-ACK feedback, allowing for granular control and resolution of the feedback control inadequacy while maintaining multi-TRP transmission benefits
Solution Approach 2:
The patent introduces an intermediary mechanism where the user terminal performs separate HARQ-ACK processing for each TRP, acting as a mediator that enables proper feedback control between multiple TRPs and the network, thus resolving the control inadequacy
2Reliability
If multi-TRP transmission is implemented, then spatial diversity gain can be achieved, but device complexity increases
Solution Approach 1:
The patent divides the HARQ-ACK control mechanism into separate, independent control paths for each TRP, reducing the overall complexity by making each control path manageable and modular rather than requiring a single complex unified control mechanism
Solution Approach 2:
The patent applies local quality by allowing different HARQ-ACK control strategies to be applied to different TRPs based on their specific characteristics, enabling optimized control for each TRP rather than a one-size-fits-all approach
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 a first Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) for the first PDSCH to the first TRP, and transmitting a second HARQ-ACK for the second PDSCH to the second TRP. According to an aspect of the present disclosure, the HARQ-ACK control can be preferably implemented even in the case of using the multi-TRP.