UE Repositioning Thresholds for Low-Mobility Position Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication networks face inefficiencies in positioning resource utilization and energy consumption due to periodic transmissions of positioning reference signals (PRS/SRS), especially for stationary or low-mobility UEs, leading to resource waste and unnecessary energy consumption.
Innovation Solution
A method that utilizes device-to-device (D2D) communication links and sensor data to locally track UE position changes, triggering repositioning procedures only when significant differences exceed predefined thresholds, thereby optimizing PRS/SRS transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If periodic transmissions of positioning reference signals (PRS/SRS) are performed, then positioning accuracy is maintained, but energy consumption and radio resource utilization deteriorate for stationary or low-mobility UEs
Solution Approach 1:
The system dynamically adjusts the positioning reference signal transmission strategy based on UE mobility state. For stationary or low-mobility UEs, periodic transmissions are reduced or suspended, while for high-mobility UEs, transmissions continue at full frequency. This dynamic adaptation resolves the contradiction by matching transmission intensity to actual positioning needs.
Solution Approach 2:
The network uses feedback mechanisms including UE location reports, mobility state indications, and measurement results to determine when PRS/SRS transmissions are necessary. This feedback loop enables the system to maintain positioning accuracy only when needed, reducing energy consumption during stable periods.
2Measurement precision
If periodic transmissions of positioning reference signals (PRS/SRS) are performed, then positioning accuracy is maintained, but radio resource utilization deteriorates for stationary or low-mobility UEs
Solution Approach 1:
The transmission schedule is dynamically adjusted based on real-time UE mobility assessment. When UEs are detected as stationary or low-mobility, the system reduces transmission frequency to conserve radio resources, while maintaining full transmission when mobility indicates positioning is needed.
Solution Approach 2:
The system changes transmission parameters including time interval, frequency, and duration based on UE state. For stationary UEs, transmission parameters are relaxed (lower frequency, shorter duration), while for mobile UEs, parameters are tightened (higher frequency, longer duration), optimizing resource utilization.
3Loss of energy
If device-to-device (D2D) communication links and sensor data are used to track UE position, then energy and radio resources are saved, but device complexity increases
Solution Approach 1:
The UE's existing sensor suite (GPS, accelerometer, gyroscope, barometer) is made multi-functional by using it not only for navigation but also for positioning reference and mobility detection. This universal use of existing components avoids adding dedicated hardware while achieving energy savings through intelligent positioning.
Solution Approach 2:
The network acts as an intermediary that processes sensor data and D2D communication information to determine positioning needs. Rather than requiring complex local processing at the UE, the network mediates by analyzing available data and making decisions about PRS/SRS transmissions, reducing UE complexity.
Data Source
AI summary
There is provided a method for a user equipment. UE, of a wireless communication network, the method comprising: obtaining a first measurement data associated with a determined position of the UE and second measurement data, the first and second measurement data obtained by performing measurements by the UE; obtaining a difference value indicative of a difference between at least one measurement value of the first measurement data and at least one measurement value of the second measurement data; comparing the difference value with at least one repositioning threshold value provided by the wireless communication network to the UE; and if the difference value exceeds the at least one repositioning threshold value, triggering a transmission of a repositioning request to a network node of the wireless communication network.