Sidelink Reference Signals for Terminal Positioning and Ranging
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Solution Overview
Problem
Existing sidelink (SL) technologies in communication systems, such as 5G NR and LTE, are inadequate for advanced V2X services like positioning services beyond basic safety-type communications.
Innovation Solution
Implementing a sidelink SL-based positioning method and apparatus that utilizes SL reference signals for determining the location, relative location, or distance between terminals, including features like sequence, pattern, frequency, and time domain characteristics to enhance positioning capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If basic SL transmission technology is used, then basic safety-type V2X communication is satisfied, but advanced positioning services cannot be provided
Solution Approach 1:
The SL reference signal is designed to serve multiple functions: it enables both basic safety communication and advanced positioning services through the same transmission mechanism. The signal can be used for channel quality assessment, distance measurement, and location determination, allowing the system to provide versatile services without requiring separate dedicated signals for each function.
Solution Approach 2:
The patent utilizes different signal parameters (time domain characteristics, frequency domain characteristics, sequence characteristics) to enable positioning functionality within the existing SL transmission framework. By manipulating these parameters, the system can extract positioning information from the same reference signals used for basic communication, thereby enhancing adaptability without compromising reliability.
2Measurement precision
If SL reference signal is sent for positioning, then positioning accuracy is improved, but signal resources are consumed
Solution Approach 1:
The SL reference signal performs dual purposes: it maintains channel quality for communication while simultaneously enabling positioning measurements. This multi-functionality reduces the need for separate dedicated positioning signals, thereby improving positioning accuracy without proportionally increasing signal resource consumption.
Solution Approach 2:
The system uses the same reference signal structure for both communication and positioning, but extracts only the necessary positioning information (time of arrival, frequency offset) without requiring additional full-duplex positioning signals. This partial extraction approach achieves adequate positioning accuracy while avoiding excessive resource consumption.
Data Source
AI summary
A sidelink SL-based positioning method, an apparatus, and a terminal are disclosed. The method includes: a first terminal sends an SL reference signal; where the SL reference signal is used for at least one of the following: determining a location of the first terminal; determining a relative location between the first terminal and at least one second terminal; determining a location of at least one of second terminal; or determining a distance between the first terminal and at least one of second terminal.