RSTD Report Resolution Adaptation for 5G NR Positioning
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Solution Overview
Problem
Current 5G NR positioning technologies face challenges in defining accurate Reference Signal Time Difference (RSTD) report resolution and accuracy, which affects the trade-off between user equipment complexity and positioning performance, especially with flexible configurations in New Radio (NR) Positioning Reference Signals (PRS).
Innovation Solution
The techniques involve adapting RSTD report resolution based on the allocation bandwidth of PRSs, selecting between a reference timing unit (Ts) and a minimal timing unit (Tc) depending on PRS bandwidth, and adjusting signal-to-noise ratio (SNR) side conditions according to the number of reference resource elements, to optimize measurement accuracy and reporting granularity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RSTD report resolution is increased to improve positioning accuracy, then positioning performance is improved, but user equipment complexity increases
Solution Approach 1:
The patent applies dynamics by making the RSTD report resolution configurable and adaptable based on positioning requirements. The system dynamically selects between different resolution levels (e.g., 0.5μs, 1μs, 2μs, 4μs, 8μs, 16μs, 32μs, 64μs) depending on the specific positioning scenario, allowing the UE to adjust its reporting granularity to match the actual positioning needs without always operating at maximum complexity.
Solution Approach 2:
The patent changes the resolution parameter of RSTD reports based on positioning accuracy requirements. By allowing the resolution parameter to be adjusted (e.g., through gNB configuration or UE autonomous selection), the system can optimize the balance between positioning accuracy and UE complexity for different scenarios, rather than using a fixed high-resolution reporting mechanism.
2Device complexity
If RSTD report resolution is decreased to reduce user equipment complexity, then user equipment complexity is reduced, but positioning accuracy deteriorates
Solution Approach 1:
The system dynamically adapts the RSTD report resolution to the specific positioning scenario. When high positioning accuracy is required, the UE uses finer resolution reporting; when lower accuracy suffices, coarser resolution is used, thereby reducing UE complexity only when appropriate for the positioning needs.
Solution Approach 2:
The resolution parameter is changed based on positioning requirements rather than being fixed. The UE or gNB can select from multiple resolution levels, adjusting the parameter to achieve the necessary positioning accuracy while minimizing UE complexity when high precision is not required.
3Measurement precision
If SNR side conditions are adjusted to improve measurement accuracy, then measurement accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies local quality by adjusting SNR side conditions specifically for RSTD measurements rather than applying uniform processing to all signal types. The gNB can configure UE-specific SNR thresholds and side conditions tailored to the positioning scenario, allowing optimized measurement accuracy only where needed for positioning without increasing processing complexity for other functions.
Data Source
AI summary
An apparatus for use in a UE includes processing circuitry coupled to a memory. To configure the UE for Reference Signal Time Difference (RSTD)-based 5G-NR positioning. The processing circuitry is to determine a first PRS BW associated with a first PRS received from a first gNB associated with a first cell. A second PRS BW is determined, which is associated with a second PRS received from a second gNB of a second cell. An RSTD report resolution is determined based on the first PRS BW and the second PRS BW. A receive (Rx) timing difference between the first cell and the second cell is measured based on reception times of the first PRS and the second PRS. The measured Rx timing difference is mapped into an RSTD report for transmission to the first gNB, based on the RSTD report resolution.