Sidelink Ranging Using PRS Types for UE-to-UE Positioning
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Solution Overview
Problem
Current wireless communication systems lack efficient support for UE-to-UE range determination, which is essential for relative positioning applications across various vertical services such as V2X, public safety, and industrial IoT, due to the absence of effective sidelink ranging methods.
Innovation Solution
The implementation of sidelink ranging procedures using different positioning reference signal (PRS) types, including PRS Type 1, 2, and 3, which enable enhanced range and orientation estimation between UEs through improved round-trip time and angle-based measurements, utilizing pulse-based waveforms and signaling frameworks for accurate and energy-efficient positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning frameworks are used, then network coverage is maintained, but UE-to-UE range determination capability is insufficient
Solution Approach 1:
The patent segments the positioning function by introducing dedicated sidelink positioning reference signals (SL-PRS) that operate independently from traditional network-based positioning. This allows UE-to-UE range determination to be performed directly between user equipment without requiring network infrastructure, thereby improving measurement precision for relative positioning while maintaining adaptability across different service scenarios.
Solution Approach 2:
The patent introduces positioning reference signals as an intermediary mechanism that enables direct measurement between UEs. These reference signals serve as a mediator that carries timing and spatial information, allowing UEs to determine range and orientation without direct network involvement, thus resolving the contradiction between measurement precision and adaptability.
2Measurement precision
If multiple PRS types are implemented, then positioning accuracy is improved, but system complexity increases
Solution Approach 1:
The patent applies local quality by configuring different PRS types (PRS Type 1, 2, and 3) with specific characteristics suited for different positioning scenarios. Each PRS type has localized optimization for specific conditions, allowing the system to achieve high positioning accuracy by selecting appropriate signal types for specific environments without requiring all types to be simultaneously processed, thus managing complexity.
Solution Approach 2:
The patent utilizes parameter changes by configuring PRS resources with varying parameters such as time offsets, frequency shifts, and spatial filters based on deployment scenarios. This allows the system to adapt positioning accuracy to different conditions by adjusting parameters rather than implementing fundamentally different signal processing architectures, thereby improving accuracy while controlling complexity.
3Use of energy by moving object
If pulse-based waveforms are used, then energy efficiency is improved, but signal processing difficulty increases
Solution Approach 1:
The patent employs periodic action by using pulse-based waveforms that transmit energy in discrete, periodic bursts rather than continuous signals. This periodic transmission pattern improves energy efficiency by allowing the transmitter to remain inactive between pulses. The periodic nature also creates predictable signal patterns that simplify detection and measurement processes, resolving the contradiction between energy efficiency and detection difficulty.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for sidelink ranging for positioning reference signal types. One apparatus (1400) includes a transceiver (1425) that transmits a sidelink (“SL”) ranging configuration comprising one or more SL ranging methods corresponding to a ranging session to a responder device, transmits a SL positioning reference signal (“PRS”) to the responder device, and receives, according to the one or more SL ranging methods and in response to the SL PRS, a ranging reply and measurement report from the responder device. The apparatus (1400) includes a processor (1405) that estimates ranging information based on the ranging reply and measurement report received from the responder device to determine a range between the initiator apparatus and the responder device.