Sidelink PRS Retransmission Using Quality Feedback for Fast Ranging
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Solution Overview
Problem
Sidelink positioning and ranging requirements have not been adequately supported in existing New Radio (NR) technologies, leading to issues such as resource inefficiency and higher latency in retransmitting positioning reference signals (PRS), which are crucial for applications like self-driving cars and public safety, especially when Global Navigation Satellite System (GNSS) coverage is unavailable.
Innovation Solution
A method for retransmitting sidelink PRS based on quality estimation, where supporting UEs determine the need for retransmission by comparing the received PRS quality with a threshold, and send feedback to the target UE using different sequences indicating satisfied or unsatisfied quality, thereby optimizing resource use and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink PRS retransmission is implemented without quality estimation feedback, then positioning reliability is improved, but resource consumption increases and latency increases
Solution Approach 1:
The patent implements a feedback mechanism where the receiving UE measures the quality of the received sidelink PRS and sends feedback information to the transmitting UE. This feedback indicates whether the PRS quality meets a threshold, enabling the transmitting UE to make informed retransmission decisions. This resolves the contradiction by allowing reliable positioning (through selective retransmission) while conserving resources (by avoiding unnecessary retransmissions).
Solution Approach 2:
The patent makes the retransmission process dynamic by adjusting retransmission behavior based on real-time quality feedback. Instead of fixed retransmission strategies, the system adapts its behavior according to the measured PRS quality and feedback received, optimizing the balance between reliability and resource consumption dynamically.
2Reliability
If sidelink PRS retransmission is implemented without quality estimation feedback, then positioning reliability is improved, but latency increases
Solution Approach 1:
The feedback mechanism provides timely quality information to the transmitting UE, enabling rapid retransmission decisions. This reduces latency by avoiding unnecessary waiting and retransmission delays, while still ensuring reliability through quality-based retransmission triggers.
Solution Approach 2:
The receiving UE performs quality estimation and prepares feedback information in advance, allowing the transmitting UE to make prompt retransmission decisions when needed. This preliminary action reduces the overall latency of the positioning process while maintaining reliability.
Data Source
AI summary
Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of retransmission of sidelink positioning reference signal (PRS). The method comprises transmitting, to a second device, a first sidelink reference signal associated with a positioning or ranging procedure of the first device; and receiving, from the second device, a second sidelink reference signal associated with the positioning or ranging procedure, the second sidelink reference signal comprising information indicating whether the first sidelink reference signal needs to be retransmitted. In this way, the retransmission of the sidelink PRS can be triggered without extra resource consumption and a fast RTT estimation for sidelink ranging and positioning can be achieved.