Multi-TRP HARQ-ACK Feedback via Segmented PUCCH Resources
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Solution Overview
Problem
In multi-Transmit-Receive Point (TRP) transmission scenarios, existing technologies face challenges in transmitting separated Hybrid Automatic Repeat Request-Acknowledge (HARQ-ACK) feedback in a single slot, especially with non-ideal backhaul, leading to overlapping PUCCH resources and reduced reliability.
Innovation Solution
Configuring multiple PUCCH resource sets with distinct detection windows for each TRP, allowing HARQ-ACKs to be transmitted on indicated or reselected PUCCH resources within the same slot, ensuring non-overlapping detection windows and efficient resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separated HARQ-ACK feedback is transmitted for multiple TRPs in a single slot, then the reliability of multi-TRP transmission is improved, but the PUCCH resources may overlap and cause interference
Solution Approach 1:
The patent divides the PUCCH resources into separate resource sets for different TRPs, with each set containing resources dedicated to specific TRPs. This segmentation prevents overlap between HARQ-ACK feedback for different TRPs while enabling simultaneous transmission in a single slot, thus improving reliability without causing interference.
Solution Approach 2:
The patent introduces a new dimension of resource organization by creating multiple PUCCH resource sets indexed by different TRPs, rather than using a single flat resource pool. This dimensional separation allows the system to manage multiple HARQ-ACK feedback streams independently, preventing resource collision while maintaining high reliability.
2Adaptability or versatility
If multiple PUCCH resources are configured for different TRPs, then the system complexity increases, but the HARQ-ACK feedback capability is improved
Solution Approach 1:
The patent creates a universal framework where multiple PUCCH resource sets follow a common structure and configuration pattern, allowing the system to handle multiple TRPs using the same resource management principles. This multi-functional approach enables the system to adapt to different numbers of TRPs without requiring fundamentally different mechanisms, thus improving capability while controlling complexity.
Solution Approach 2:
The patent manages complexity by parameterizing the resource configuration through higher-layer signaling, where the number of PUCCH resource sets, their sizes, and associations with TRPs are configurable parameters. This allows the system to adapt to different deployment scenarios by changing parameters rather than restructuring the entire framework, balancing versatility and complexity.
3Productivity
If PUCCH resources are reselected to avoid overlap, then the resource utilization efficiency is improved, but the detection window constraints may be violated
Solution Approach 1:
The patent performs preliminary configuration of PUCCH resource sets with pre-defined associations to TRPs and detection windows. By establishing these associations in advance through higher-layer signaling, the system ensures that resource selection automatically complies with detection window constraints, eliminating the need for post-selection validation and ensuring both efficiency and reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the network configures PUCCH resource sets based on detected needs and constraints, and the UE provides feedback on resource availability and conflicts. This closed-loop approach allows the system to optimize resource utilization while ensuring detection window compliance through iterative adjustment and validation.
Data Source
AI summary
Embodiments of the present application relate to methods and apparatuses for Hybrid Automatic Repeat Request-Acknowledge (HARQ-ACK) feedback in multi-Transmit-Receive Point (TRP) transmission. According to an embodiment of the present disclosure, a method can include: transmitting configuration information indicating at least one Physical Uplink Control Channel (PUCCH) resource set; indicating a PUCCH resource of the at least one PUCCH resource set via Downlink Control Information (DCI), wherein the indicated PUCCH resource is at least for carrying a HARQ-ACK; and detecting the HARQ-ACK at least on the indicated PUCCH resource. Embodiments of the present disclosure can increase the robustness of multi-TRP transmission.