Dynamic Tracking Area Lists for High-Mobility Location Management
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Solution Overview
Problem
Existing location management systems in wireless communication networks face inefficiencies due to high signaling and processing overheads when dealing with high mobility scenarios, particularly with non-stationary base stations like satellites and drones, leading to frequent registration area updates and increased processing complexity at the user equipment.
Innovation Solution
Implementing a list of time variant transmission points with associated validity information and a dynamic tracking area list that includes time windows to manage UE location efficiently, reducing signaling and processing overheads by allowing partial list processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional location management system is used with stationary base stations, then the network can maintain simple location tracking, but it cannot efficiently handle high mobility scenarios with non-stationary base stations like satellites and drones
Solution Approach 1:
The patent introduces a dynamic tracking area list (TAL) that is updated based on the UE's mobility state and current location. Unlike static TAL approaches, this dynamic TAL adapts to changing mobility conditions, allowing the system to efficiently handle both stationary and high-mobility scenarios. The TAL is modified based on whether the UE is in high mobility state, enabling the network to respond dynamically to changing conditions without requiring completely different management systems.
Solution Approach 2:
The patent changes key parameters of the location management system including introducing time windows (validity periods) for TAL entries, modifying TAL update triggers based on mobility detection, and adjusting the frequency of location updates. These parameter changes allow the system to optimize performance for different mobility scenarios without increasing overall complexity, as the same basic framework adapts through parameter adjustment rather than structural overhaul.
2Measurement precision
If the UE frequently updates its registration area due to high mobility, then the network can maintain accurate location tracking, but the signaling overhead and processing complexity increase significantly
Solution Approach 1:
The patent implements partial TAL updates rather than complete updates on every location change. When the UE detects it has left its current tracking area, it performs a selective update of the TAL based on its mobility state and predicted movement pattern. This partial action approach maintains sufficient location tracking accuracy while significantly reducing the signaling overhead compared to complete frequent updates, as the UE only updates location information when necessary rather than continuously.
Solution Approach 2:
The network performs preliminary TAL configuration based on the UE's subscription information and expected mobility patterns before the UE actually moves. This allows the initial TAL to be pre-optimized for the UE's likely movement, reducing the need for frequent reactive updates. The preliminary setup includes configuring appropriate tracking areas and validity periods that anticipate future location changes, thereby maintaining accuracy while minimizing subsequent signaling.
3Reliability
If the TAL is updated frequently to track high mobility UEs, then the network can maintain current location information, but the processing complexity at the UE increases
Solution Approach 1:
The patent introduces periodic TAL updates with time windows (validity periods) associated with each tracking area in the list. Instead of continuous or event-driven updates that require constant UE processing, the system uses periodic updates at predetermined intervals. The UE simply checks whether the current time exceeds the validity period of its TAL entries, which is a computationally simple operation that maintains reliable location information without burdening the UE with complex continuous processing.
4Ease of manufacture
If the network uses a static TAL for location management, then the system is simple to implement, but it cannot adapt to changing mobility patterns and non-stationary base stations
Solution Approach 1:
The patent segments the TAL into multiple entries, each associated with a specific time window or validity period. This segmentation allows different parts of the TAL to serve different purposes - some entries for stationary areas, others for mobile trajectories. The segmented structure maintains the simplicity of a list-based approach while enabling adaptability, as individual segments can be updated or expired independently based on mobility patterns without requiring complete system redesign.
Data Source
AI summary
A wireless communication system, including: a plurality of time variant transmission points for communicating with a user device, UE, wherein the UE is in a tracking region, wherein the UE is configured to receive and store a list including identifiers, IDs, of time variant transmission points for the tracking region, and wherein the list includes IDs of time variant transmission points which are available or visible for the UE in the one tracking region at different times or time periods.