NR Positioning Latency Reduction via Dynamic PRS Sampling
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Solution Overview
Problem
Current 5G NR positioning measurement techniques face challenges in reducing latency, particularly in scenarios with non-line-of-sight (NLOS) channels and low signal-to-interference-noise ratio (SINR) conditions, which degrades measurement accuracy and increases latency.
Innovation Solution
The proposed solution involves configuring user equipment (UE) to perform positioning measurements with a reduced number of positioning reference signal (PRS) samples, leveraging higher SINR conditions and adequate PRS bandwidth to maintain accuracy while reducing latency, by dynamically adjusting the number of measurement samples based on channel conditions and SINR thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the number of PRS measurement samples is reduced, then positioning measurement latency is reduced, but measurement accuracy deteriorates
Solution Approach 1:
The patent applies dynamics by making the number of measurement samples adjustable rather than fixed. The UE dynamically configures the number of PRS measurement samples based on current channel conditions, SINR thresholds, and positioning accuracy requirements. This allows the system to adapt between accuracy and latency trade-offs in real-time, resolving the contradiction between measurement precision and loss of time.
Solution Approach 2:
The patent changes the parameter of measurement sample count from a static configuration to a dynamic variable. By adjusting the number of PRS samples based on SINR conditions and channel quality, the system optimizes the balance between measurement accuracy and latency. This parameter change enables the system to achieve both low latency and maintained accuracy under varying network conditions.
2Measurement precision
If the number of PRS measurement samples is reduced, then positioning measurement accuracy may be maintained under high SINR conditions, but reliability deteriorates in NLOS channels
Solution Approach 1:
The patent implements feedback mechanisms where the UE monitors channel conditions and SINR thresholds during measurement. Based on this feedback, the system adjusts the number of measurement samples and determines whether to report measurements. This feedback loop ensures that reliability is maintained by only reducing samples when conditions permit, preventing inaccurate measurements in NLOS scenarios.
Solution Approach 2:
The patent applies preliminary action by having the UE assess channel conditions and SINR thresholds before actually performing the positioning measurement. This preliminary evaluation determines the appropriate number of samples to use, preventing premature or inaccurate measurements in poor channel conditions while enabling reduced-sample measurements when conditions are favorable.
Data Source
AI summary
A computer-readable storage medium stores instructions to configure a UE for NR positioning in a 5G NR network, and to cause the UE to perform operations including decoding configuration signaling received from a location and management function (LMF) node of the 5GNR network. The configuration signaling includes a positioning reference signal (PRS) measurement configuration. A number of measurement samples per a successful measurement reporting can be indicated by the PRS measurement configuration which depends on a specific conditions (e.g., PRS bandwidth, propagation channel, and SINR). A PRS received from a base station is decoded. Downlink PRS (DL-PRS) positioning measurements is performed based on the PRS. The DL-PRS positioning measurements are encoded for transmission to the LMF node using the number of measurement samples.