Sidelink PRS Timing Measurement for Accurate Round-Trip Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately measuring round-trip-time on a sidelink interface, which is crucial for precise positioning and communication in 5G/NR networks, particularly in scenarios involving direct device-to-device connections.
Innovation Solution
A user equipment (UE) is equipped with a transceiver to receive a first sidelink positioning reference signal (PRS) and a processor to measure receive timing, determine reference transmit timing, and calculate the sidelink Rx-Tx time difference, enabling the generation of a report based on this time difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If round-trip-time measurement is performed on sidelink interface in existing wireless communication systems, then positioning and communication functions can be implemented, but measurement accuracy is insufficient
Solution Approach 1:
The patent segments the round-trip-time measurement process into distinct components: determining transmit timing of uplink signals, measuring receive timing of downlink signals, and calculating the time difference. This segmentation allows each component to be optimized independently, improving overall measurement accuracy while maintaining system reliability
Solution Approach 2:
The patent implements feedback mechanisms where the measured Rx-Tx time difference is reported back to the network, enabling compensation for timing variations and propagation delays. This feedback loop continuously refines the positioning accuracy, resolving the contradiction between measurement precision and positioning reliability
2Productivity
If direct device-to-device connections are used in 5G/NR networks, then communication efficiency is improved, but timing measurement challenges arise
Solution Approach 1:
The patent creates a universal timing measurement framework that works across different connection types (network-assisted and direct device-to-device). By defining standardized procedures for determining transmit and receive timings that apply universally, the patent maintains measurement precision while enabling efficient direct communications
Solution Approach 2:
The patent adjusts timing parameters dynamically based on the connection type and propagation conditions. By changing parameters such as timing advance values and measurement windows according to specific scenarios, the patent achieves both communication efficiency and measurement accuracy in direct device-to-device connections
Data Source
AI summary
A method of operating a user equipment (UE) is provided. The method includes receiving, from a second UE, a first sidelink (SL) positioning reference signal (PRS) in slot m; measuring a receive (Rx) timing of the first SL PRS in the slot m; and determining a reference transmit (Tx) timing of the slot m. The method further includes determining a first SL Rx−Tx time difference as a difference between the Rx timing of the first SL PRS in the slot m and the reference Tx timing of the slot m and determine information for a first report based on the first SL Rx−Tx time difference.