UE Speed-Based Configuration Selection for Wireless Mobility
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Solution Overview
Problem
In wireless communication systems, especially in 5G and LTE, there is a gap between actual UE speed and estimated UE speed, leading to inaccurate mobility-related parameter settings, which can cause handover failures due to the inability of the gNB to update mobility parameters in real-time as UE speed changes.
Innovation Solution
A method where UE selects a configuration for measurement reporting based on its measured speed using GPS, scaling values accordingly, and switches between two configurations provided by the network, ensuring timely updates of mobility-related parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gNB estimates UE speed based on cell change information, then the mobility parameters can be set initially, but the speed estimation becomes inaccurate when UE speed continues to increase after entering a cell
Solution Approach 1:
The UE performs speed measurement using GPS in advance before handover decisions are made. The measured speed is reported to the gNB, which then uses this pre-acquired speed information to configure appropriate mobility parameters, eliminating the delay inherent in post-entry speed estimation.
Solution Approach 2:
GPS speed measurement serves as an intermediary source of accurate speed information between the UE's physical motion and the gNB's mobility parameter configuration. This intermediary measurement mechanism provides real-time speed data that bridges the gap between actual UE speed and the gNB's estimated speed.
2Reliability
If the gNB updates mobility parameters in real-time, then the handover failure rate decreases, but the system complexity and signaling overhead increase
Solution Approach 1:
The UE autonomously measures its own speed using GPS and self-reports this information to the gNB. This self-service approach eliminates the need for complex gNB-side speed estimation algorithms and reduces signaling overhead compared to continuous real-time parameter updates, while still achieving reliable handovers through accurate speed-aware configuration.
Solution Approach 2:
The UE provides feedback about its measured speed to the gNB, which then configures mobility parameters accordingly. This feedback mechanism enables the system to adapt to changing UE speed conditions without requiring continuous real-time updates, balancing reliability with system complexity.
3Measurement precision
If the UE uses GPS for speed measurement, then the speed accuracy improves, but the energy consumption increases
Solution Approach 1:
The UE uses GPS for speed measurement partially - only when needed for mobility parameter configuration rather than continuously. This partial action approach maintains measurement accuracy when required while reducing overall energy consumption compared to continuous GPS operation.
Data Source
AI summary
Provided are a method of selecting configuration based on UE speed and a device supporting the method. According to one embodiment of the present invention, a method for selecting configuration based on UE speed in a wireless communication system includes: receiving a first configuration and a second configuration from a network; if the UE is able to measure a speed of the UE by using a global positioning system (GPS), selecting the first configuration, and scaling values in the first configuration based on the speed of the UE; and if the UE is not able to measure the speed of the UE by using the GPS, selecting the second configuration.