NR-U Positioning Enhancement via LBT Feedback and Extended Measurement
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Solution Overview
Problem
Legacy UE positioning systems in NR-U bands face inaccuracies due to LBT failures, which lead to undetectable PRSs and reduced anchor points, impacting positioning accuracy.
Innovation Solution
The implementation of capability signaling by UE to indicate support for positioning operations in NR-U spectrum, allowing the network to configure assistance data accordingly, and extending measurement periods to detect PRSs in unlicensed carriers, ensuring successful RSTD measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT procedure is performed in NR-U spectrum, then channel access is achieved, but PRS transmission may be muted due to LBT failures
Solution Approach 1:
The network performs preliminary actions by transmitting indication information about channel occupancy status and LBT failure status before positioning measurements are affected. This allows the UE to know in advance whether PRS transmissions will occur, enabling proper measurement planning and reducing positioning failures.
Solution Approach 2:
The system implements feedback mechanisms where the network provides LBT failure status and channel occupancy information to the UE. This feedback loop allows the positioning system to adapt to actual channel conditions, distinguishing between LBT-induced PRS absence and other causes, thereby maintaining positioning reliability.
2Measurement precision
If measurement period is extended to detect PRS in unlicensed carriers, then positioning accuracy is improved, but measurement time increases
Solution Approach 1:
The network provides preliminary indication information about channel occupancy and LBT success status before the measurement period begins. This allows the UE to focus measurements only on time periods when PRS transmissions are expected, reducing the effective measurement time needed while maintaining positioning accuracy.
Solution Approach 2:
The measurement strategy becomes dynamic based on received indication information. The UE can adapt its measurement window timing and duration according to the network's channel occupancy status, optimizing the balance between measurement precision and time consumption rather than using a fixed extended measurement period.
3Adaptability or versatility
If capability signaling is implemented for NR-U positioning support, then positioning operations can be configured appropriately, but signaling complexity increases
Solution Approach 1:
Capability signaling is performed preliminarily during initial network setup and registration phases. The UE's NR-U positioning capability is established early, allowing the network to configure appropriate positioning parameters without requiring complex real-time signaling adjustments during actual positioning operations.
Solution Approach 2:
The capability signaling mechanism is designed to be universal, handling multiple positioning scenarios (OTDOA, channel occupancy indication, LBT failure indication) through a unified capability framework. This reduces overall signaling complexity compared to implementing separate signaling mechanisms for each positioning feature.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods to provide positioning enhancements on unlicensed spectrum.