NTN Moving-Cell Mobility Configuration for Accurate UE Handover Timing
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Solution Overview
Problem
Existing mobility management solutions for UEs in non-terrestrial networks (NTN) with earth-moving cells face challenges in IDLE or INACTIVE mode due to issues in indicating cell reference location, calculating distance, determining stop serving time, and feeder link switch time, which are not adequately addressed for quasi-earth-fixed cells.
Innovation Solution
The UE and RAN node provide configurations for determining cell reference location, distance metric evaluation, UE-specific stop serving time, and feeder link switch time using movement information, location offsets, and dedicated signaling to enhance mobility management in earth-moving cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing mobility management solutions are used for NTN with earth-moving cells, then network coverage is provided, but mobility management accuracy and power consumption are insufficient
Solution Approach 1:
The patent introduces dynamic configurations for cell reference location, distance metric evaluation, stop serving time, and feeder link switch time that adapt to the moving nature of earth-moving cells. These dynamic parameters enable accurate mobility management while reducing unnecessary measurements and calculations, thereby lowering power consumption.
Solution Approach 2:
The patent modifies existing mobility management parameters by introducing new configurations specific to earth-moving cells, including variable cell reference locations, updated distance metrics, and adjusted time values. These parameter changes enable precise mobility management tailored to the dynamic characteristics of satellite-based networks.
2Measurement precision
If cell reference location is indicated with movement information, then mobility management accuracy is improved, but message complexity increases
Solution Approach 1:
The patent segments the cell reference location information into multiple components: movement information, additional cell reference locations, location offsets, and validity durations. This segmentation allows the UE to process and store location data in a structured manner, improving accuracy while managing complexity through organized information presentation.
Solution Approach 2:
The patent provides preliminary configurations for cell reference location and movement information in advance, allowing the UE to pre-calculate and store necessary data. This preliminary action reduces the computational burden during actual mobility management operations, effectively managing message complexity while maintaining high accuracy.
3Measurement precision
If UE-specific stop serving time is determined, then mobility management accuracy is improved, but processing time increases
Solution Approach 1:
The patent determines UE-specific stop serving time values in advance based on configured parameters and movement information. By performing this calculation preliminarily, the UE avoids complex real-time computations during critical mobility decisions, thereby improving accuracy while minimizing processing time delays.
Solution Approach 2:
The patent enables the UE to autonomously determine its own stop serving time based on received configurations and stored movement information. This self-service approach eliminates the need for continuous network signaling and complex real-time processing, improving accuracy while reducing processing time through local autonomous decision-making.
4Measurement precision
If distance metric evaluation is enhanced, then mobility management accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent introduces enhanced distance metric configurations including RSRP thresholds, RSRP variation thresholds, and time thresholds that enable more accurate distance measurements. By providing these specialized parameters, the patent achieves improved accuracy while managing computational complexity through targeted measurements rather than comprehensive calculations.
Solution Approach 2:
The patent applies partial distance metric evaluations based on configured thresholds and conditions. Instead of performing complete distance calculations in all scenarios, the UE uses selective measurements triggered by specific conditions (e.g., RSRP changes, time thresholds), thereby improving accuracy when needed while reducing overall computational complexity through selective processing.
Data Source
AI summary
The present application relates to methods and apparatuses for mobility enhancements. An embodiment of the present disclosure provides a user equipment (UE), comprising: a transceiver, and a processor coupled with the transceiver and configured to: receive a message associated with a moving cell, wherein the message indicates at least one of the following: a first configuration associated with a cell reference location; a second configuration associated with distance metric evaluation; a third configuration associated with a cell stop serving time value; or a fourth configuration associated with a feeder link switch time value; determine the cell reference location of the moving cell or a UE-specific stop serving time value based on the message.