UE-Centric Virtual Cell for V2X Mobility Management
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Solution Overview
Problem
In gNB-based Ultra-Dense Networks (UDNs), mobility management is challenging due to small cell sizes and high mobility levels, leading to frequent cell transfers and high signaling overhead.
Innovation Solution
The implementation of UE-centric cells that utilize sidelink groupcast and standardized V2X messages to create and manage virtual moving cells, allowing for agile beam-tracking and reducing the need for frequent handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gNB-based cells are used in UDNs, then network coverage can be provided, but mobility management becomes problematic due to frequent cell transfers and high signaling overhead
Solution Approach 1:
The patent inverts the conventional cellular architecture by making the UE the center of the cell rather than the gNB. The UE-centric cell is defined by the UE's position and movement characteristics, with the cell boundary dynamically adapting to the UE's trajectory. This inversion eliminates the need for frequent handovers between fixed gNB cells, as the cell moves with the UE, thereby reducing signaling overhead while maintaining reliable mobility management
Solution Approach 2:
The patent implements dynamic cell boundaries that adapt to the UE's movement characteristics. The cell radius and shape are dynamically adjusted based on the UE's speed, direction, and predicted trajectory. This dynamic approach allows the cell to smoothly follow the UE's movement without requiring discrete handover events, reducing signaling complexity while maintaining connection reliability
2Reliability
If conventional handover procedures are used for mobile UEs, then connectivity can be maintained, but frequent cell transfers are needed in short periods of time
Solution Approach 1:
The patent employs predictive algorithms that use the UE's current position, speed, and direction to forecast future cell boundaries and potential handover points in advance. By preparing handover resources and configurations beforehand based on predicted UE movement, the system can execute seamless connectivity transitions without frequent reactive handovers, reducing the time loss associated with cell transfers
Solution Approach 2:
The patent maintains continuous connectivity by establishing overlapping cell coverage zones and pre-configuring handover parameters before the UE actually crosses cell boundaries. This ensures that connectivity is maintained without interruption or frequent re-establishment, as the useful action of data transmission continues seamlessly across cell transitions
3Adaptability or versatility
If UE-centric cells leverage application data such as positioning and speed, then more intelligent and proactive cell management is achieved, but processing requirements increase
Solution Approach 1:
The patent implements self-service mechanisms where the UE autonomously measures its own positioning, speed, and movement characteristics using onboard sensors and signaling. The UE then self-determines its cell boundary and reports only essential parameters to the network. This self-service approach enables intelligent, adaptive cell management while minimizing the processing burden on network infrastructure, as the UE performs the computationally intensive measurements and calculations locally
Data Source
AI summary
A user equipment centric cell including a user equipment (UE) that employs standardized vehicle-to-everything (V2X) messages and that includes at least a roadside unit (RSU) having sidelink (SL) groupcast capability.