MDT Location Signaling for High-Mobility UE Accuracy
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Solution Overview
Problem
Existing 5G NR technologies face challenges in accurately determining the location of mobile user equipment (UE) during minimization of drive tests (MDT), as location fixes may become outdated due to high speeds, leading to incorrect network configurations and performance degradation.
Innovation Solution
UEs are configured to periodically calculate their location based on MDT configurations, using metrics such as RSRP, mobility, and Doppler spread to adjust the frequency of location fixes, and network nodes receive uncertainty metrics to improve network planning and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If location fixes are performed less frequently to reduce signaling overhead, then signaling overhead is reduced, but location accuracy deteriorates due to high UE mobility
Solution Approach 1:
The patent implements dynamic adaptation of location fix frequency based on UE mobility state. The network node determines whether to configure periodic location fixes or event-triggered location fixes based on measured mobility parameters (Doppler spread, cell reselection rate). This dynamic configuration optimizes the balance between signaling overhead and location accuracy according to actual UE movement conditions.
Solution Approach 2:
The patent employs feedback mechanisms where the network node receives location information and mobility measurements from the UE, then uses this feedback to adjust the location fix configuration. The network node can update the MDT configuration based on observed mobility patterns, creating a closed-loop system that adapts to changing conditions and maintains optimal performance.
2Measurement precision
If periodic location fixes are configured for mobile UEs, then location accuracy is improved, but battery consumption increases
Solution Approach 1:
The patent dynamically adjusts location fix frequency based on UE mobility state. For high-mobility UEs, event-triggered location fixes are configured instead of frequent periodic fixes, reducing battery consumption while maintaining adequate location accuracy. The configuration adapts to actual mobility conditions rather than applying a fixed periodic schedule to all UEs.
Solution Approach 2:
The patent changes the operational parameters of location fixing based on mobility conditions. By modifying the trigger conditions (from time-based periodic to event-based) and frequency parameters according to measured mobility metrics, the system optimizes the balance between location accuracy and energy consumption for each UE scenario.
3Use of energy by moving object
If event-triggered location fixes are used instead of periodic fixes, then battery consumption is reduced, but location accuracy deteriorates during high mobility
Solution Approach 1:
The patent implements a dynamic configuration system that selects between periodic and event-triggered location fixes based on real-time mobility assessment. For UEs exhibiting high mobility characteristics (high Doppler spread, frequent cell reselection), the system configures periodic location fixes to ensure adequate location accuracy, while for low-mobility UEs, event-triggered fixes suffice to conserve battery.
Solution Approach 2:
The patent modifies the operational parameters of the location fixing mechanism based on mobility conditions. By changing the trigger type (periodic vs. event-based) and associated parameters according to measured mobility metrics, the system achieves optimal balance between energy consumption and location accuracy for each specific UE scenario.
4Measurement precision
If location fixes are performed more frequently to maintain accuracy, then location accuracy is improved, but network signaling overhead increases
Solution Approach 1:
The patent employs dynamic configuration of location fix frequency based on UE mobility state. The network node assesses mobility parameters and configures appropriate location fix intervals or trigger conditions. This dynamic approach ensures adequate location accuracy for mobile UEs while avoiding excessive signaling overhead by not applying uniform high-frequency periodic fixes to all UEs regardless of mobility.
Solution Approach 2:
The patent adjusts the operational parameters of location fixing based on mobility conditions. By modifying frequency, periodicity, and trigger conditions according to measured mobility metrics, the system optimizes the balance between location accuracy and signaling overhead, applying higher frequency only when mobility characteristics justify the additional overhead.
Data Source
AI summary
A network node may configure a minimization of drive test (MDT) configuration. The network node may transmit, for a user equipment (UE), the MDT configuration. The UE may obtain the minimization of drive test (MDT) configuration. The UE may calculate at least one of a location of the UE or an MDT uncertainty metric based on the MDT configuration. The UE may transmit at least one of a first indicator of the calculated location of the UE or a second indicator of the calculated MDT uncertainty metric. The network node may receive at least one of the first indicator of a location of the UE or the second indicator of the MDT uncertainty metric based on the MDT configuration.