HARQ Feedback Transmission via Multi-TRP Selection for Sidelink Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly in sidelink communications, face challenges in efficiently managing resources and selecting transmitter-receiver points (TRPs) for HARQ feedback, leading to potential collisions and imbalanced signal reception, which affects the reliability and success of sidelink transmissions.
Innovation Solution
The method involves determining resources and selecting one or multiple TRPs based on conditions such as received signal strength and quality to optimize HARQ feedback transmission, allowing for simultaneous transmission even in cases of overlapping sidelink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single TRP is used for HARQ feedback transmission, then device complexity is reduced, but signal quality and reliability deteriorate due to imbalanced reception and potential collisions
Solution Approach 1:
The patent implements dynamic TRP selection where the transmitting UE chooses different TRPs based on real-time channel conditions and interference levels. The receiving UE monitors multiple TRPs and selects the optimal one for feedback transmission, adapting to changing network conditions to maintain high reliability without requiring complex static configurations
Solution Approach 2:
The system enables UEs to autonomously select and manage their own TRPs for feedback transmission without requiring complex network coordination. Each UE independently evaluates channel conditions and makes intelligent decisions about which TRP to use, reducing overall system complexity while maintaining reliability
2Reliability
If multiple TRPs are used for simultaneous feedback transmission, then collision resistance improves, but resource management complexity increases
Solution Approach 1:
The patent divides the feedback transmission resource space into multiple segments corresponding to different TRPs. By segmenting the transmission paths, the system allows simultaneous feedback from multiple UEs through different TRPs, reducing collisions while keeping resource management manageable through structured allocation
Solution Approach 2:
The patent introduces the TRP dimension as an additional resource dimension for feedback transmission. Instead of only time-frequency resources, the system now has spatial diversity through multiple TRPs, allowing UEs to select feedback resources in this new dimension to avoid collisions without overly complicating resource management
3Measurement precision
If TRP selection is based on comprehensive conditions, then signal quality maximizes, but processing overhead increases
Solution Approach 1:
The patent performs preliminary measurements and evaluations of TRP conditions during normal operation. The receiving UE pre-assesses channel quality and interference levels for multiple TRPs before feedback transmission is needed, so that when feedback time arrives, the optimal TRP can be selected quickly without extensive real-time processing
Data Source
AI summary
Certain aspects of the present disclosure provide a method for wireless communications by a first user equipment (UE). The method generally includes receiving a first sidelink transmission from a second UE, determining resources for providing a feedback responsive to the first sidelink transmission, selecting one or multiple transmitter receiver points (TRPs), from a set of TRPs of the UE, for transmitting the feedback, based on one or more conditions, and transmitting the feedback on the determined resources using the selected TRPs.