Height-Aware Mobility Management for Aerial Wireless Devices
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Solution Overview
Problem
Aerial UEs experience frequent cell changes due to line-of-sight propagation and interference from multiple cells, leading to signaling overhead and inefficient mobility management in wireless communication systems.
Innovation Solution
A method for wireless devices to perform mobility based on height, involving receiving height-related mobility configurations, monitoring current height, evaluating mobility conditions, and executing mobility to suitable cells such as UAV-specific or nearby cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aerial UEs use traditional mobility management based on signal strength alone, then they can connect to available cells, but they experience frequent cell changes and signaling overhead due to line-of-sight propagation and interference from multiple visible cells
Solution Approach 1:
The patent introduces height as an additional parameter for mobility management decisions. Instead of relying solely on signal strength metrics like RSRP and RSRQ, the system now considers the vertical position of aerial UEs to determine serving cell selection and handover timing, thereby reducing unnecessary cell changes and associated signaling overhead
Solution Approach 2:
The patent introduces a network entity (such as a base station or mobility management function) that acts as an intermediary to evaluate mobility conditions for aerial UEs. This intermediary receives height information, evaluates whether cell changes are necessary, and makes informed decisions to prevent unnecessary handovers, thereby reducing signaling overhead while maintaining connection reliability
2Area of stationary object
If aerial UEs are served by faraway networks using side lobes, then coverage can be extended, but cell coverage becomes fragmented and continuous service cannot be guaranteed
Solution Approach 1:
The patent changes the selection criteria for serving cells by incorporating height information. Instead of allowing aerial UEs to connect to any cell with sufficient signal strength (including faraway networks using side lobes), the system now selects cells based on both signal strength and height compatibility, ensuring that the serving cell is appropriate for the aerial UE's vertical position and maintaining continuous service
Solution Approach 2:
The patent implements preliminary evaluation of mobility conditions based on height information before executing cell changes. By pre-assessing whether a cell is suitable for aerial UEs at specific heights, the system prevents fragmentation of coverage and ensures continuous service without requiring reconnection to inappropriate cells
3Adaptability or versatility
If aerial UEs detect more neighbor cells due to line-of-sight propagation, then more cell options are available, but conditional mobility causes more frequent cell changes and increased signaling overhead
Solution Approach 1:
The patent adds height as a filtering parameter for evaluating neighbor cells. Even though aerial UEs can detect multiple cells with line-of-sight propagation, the system now uses height information to determine which cells are actually suitable for service, thereby reducing the number of candidate cells that trigger conditional mobility procedures and subsequent cell changes
Data Source
AI summary
A method and apparatus for mobility based on height in a wireless communication system is provided. A wireless device receives information on a mobility configuration associated with a height range; monitoring a current height of the wireless device. A wireless device evaluates at least one condition for a mobility based on the mobility configuration, based on the current height of the wireless device being in the height range. A wireless device performs mobility to a target cell among one or more candidate target cells based on the evaluation. The mobility configuration includes information on the one or more candidate target cells.