Lower-Layer Mobility Cell Grouping to Reduce Aerial UE Signaling
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Solution Overview
Problem
Aerial UEs experience frequent de-configuration and re-configuration of candidate cells due to their mobility characteristics, leading to significant signaling overhead and inefficiencies in Layer 1 or Layer 2 triggered mobility (LTM) operations, particularly when conventional conditional LTM conditions are not suitable.
Innovation Solution
Implementing LTM using activated groups of candidate cells, where UEs measure and report only a subset of activated cells, reducing measurement and signaling overhead, and performing conditional LTM based on conditions relevant to aerial UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional LTM operations are used for aerial UEs, then cell switching can be performed, but frequent de-configuration and re-configuration of candidate cells occurs leading to significant signaling overhead
Solution Approach 1:
The patent segments the candidate cells into multiple groups (first group, second group, etc.) where each group contains a subset of candidate cells. The UE is configured with multiple LTM operations, each associated with a different group. This segmentation allows the network to manage aerial UEs more efficiently by activating only relevant cell groups based on UE location and mobility patterns, thereby reducing the frequency of de-configuration and re-configuration events and lowering signaling overhead.
2Loss of information
If all candidate cells are measured and reported, then complete mobility information is available, but measurement and signaling overhead increases significantly
Solution Approach 1:
The patent extracts and processes only a subset of candidate cells at any given time by organizing them into groups. Instead of measuring and reporting on all candidate cells simultaneously, the UE measures cells within activated groups. The network can activate different groups based on UE location, ensuring that sufficient mobility information is available while significantly reducing measurement and reporting overhead.
3Adaptability or versatility
If conditional LTM conditions are not tailored for aerial UEs, then general mobility management is maintained, but efficacy of conditional LTM decreases for aerial platforms
Solution Approach 1:
The patent applies local quality by configuring different LTM conditions and candidate cell groups tailored to aerial UE-specific characteristics such as altitude, velocity, and flight patterns. Rather than using uniform conditions for all UEs, the network can activate specific groups of candidate cells based on aerial UE mobility patterns, thereby improving the efficacy and reliability of conditional LTM for aerial platforms.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. Some aspects relate to Layer 1 or Layer 2 triggered mobility (LTM) using groups of candidate cells. Some aspects more specifically relate to performing LTM operations, such as measurement, reporting, or switching, for cells of an activated group of candidate cells for LTM. In some aspects, a user equipment (UE) may measure an activated group of candidate cells in accordance with the activated group of candidate cells being activated. For example, the UE may not measure candidate cells that do not belong to an activated group of candidate cells. In some aspects, the activated group of candidate cells may include a subset of all candidate cells configured for the UE. For example, the UE may perform measurement and reporting for the subset of candidate cells, instead of all candidate cells configured for the UE.