Sidelink-Assisted UE Positioning Measurement Reporting
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Solution Overview
Problem
The existing Long-Term Evolution (LTE) Positioning Protocol lacks definitions for sidelink (SL)-based assisted measurements, which are essential for accurate positioning of User Equipment (UE) using the SL interface, particularly in determining the location of a target UE.
Innovation Solution
The proposed solution involves obtaining and reporting specific measurements, such as Reference Signal Time Difference (RSTD) and Round Trip Time (RTT), using the SL interface between UEs and a base station, within a predetermined time window, to facilitate accurate positioning. This includes using a base station as a reference node for RSTD determination and employing transparent or advanced modes for RTT measurements, with angle-based measurements also considered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SL-based assisted measurements are implemented for UE positioning, then positioning accuracy is improved, but protocol definition complexity increases
Solution Approach 1:
The patent introduces an intermediary layer (SL-based measurement framework) between existing Uu interface measurements and UE positioning. This framework adapts and integrates SL-specific measurements (RSTD, RTT, AoA) into the positioning protocol, allowing accurate positioning without requiring complete protocol redesign. The intermediary layer handles the complexity of SL measurements while presenting standardized positioning data to upper layers.
2Reliability
If multiple measurement types (RSTD, RTT, AoA) are collected within a time window, then positioning reliability is improved, but measurement and reporting overhead increases
Solution Approach 1:
The patent merges multiple measurement types (RSTD, RTT, AoA) into a unified measurement report structure. Instead of handling each measurement type separately, the framework combines them into a single reporting mechanism with a common time window, reducing the number of separate reporting procedures and overhead associated with multiple independent measurement processes.
Solution Approach 2:
The patent performs preliminary configuration of measurement parameters, time windows, and reporting structures before actual measurements begin. The location server pre-configures the UE with measurement opportunities, time window parameters, and reporting formats, so that during the measurement phase, the UE can efficiently collect multiple measurement types without repeated negotiation or configuration overhead.
Data Source
AI summary
According to embodiments herein, the use of an SL interface in the positioning of a UE can include additional reporting from the UE or an anchor UE related to a reference signal sent via the SL interface. This information can include information regarding the received power and/or timing of the reference signal, the angle at which it was received, and orientation of a receiving UE, and various other considerations that may not be needed in a Uu interface with a base station.