Satellite Uu Link Setup for NTN Inter-Node Mobility Handover
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Solution Overview
Problem
Existing non-terrestrial network (NTN) systems face challenges in managing inter-node mobility due to satellite position changes, leading to inefficiencies in handover processes and resource allocation.
Innovation Solution
Implementing a device and method for inter-node mobility management that includes determining connection establishment conditions based on satellite position, initiating a random access channel procedure, and establishing a Uu link between base stations through a satellite, enabling mobility management signaling and deactivation of capabilities as needed, and establishing dedicated cells for inter-gNB communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional handover implementation is used in NTN systems, then basic satellite location and trajectory considerations are addressed, but inefficiencies remain in handover processes and resource allocation due to satellite position changes
Solution Approach 1:
The system performs preliminary actions by establishing the Uu link between base stations and activating WTRU capabilities before the actual handover is needed. The source gNB initiates RACH procedure and establishes connection with target gNB in advance, so that when handover becomes necessary, the infrastructure is already in place and ready for immediate use, eliminating setup delays during critical handover moments
Solution Approach 2:
The system implements dynamic capability management where WTRU capabilities are activated and deactivated based on real-time satellite position and handover requirements. The deactivation command is sent after handover completion to release resources, creating a dynamic resource allocation system that adapts to changing satellite positions and handover needs, improving both efficiency and resource utilization
2Ease of operation
If inter-base station communication is established through satellite links, then mobility management signaling can be exchanged, but device complexity and resource allocation overhead increase
Solution Approach 1:
The satellite acts as an intermediary medium that enables communication between source and target gNBs without requiring direct terrestrial infrastructure. The Uu link through satellite serves as the mediator that carries mobility management signaling, allowing inter-base station communication in NTN environments where traditional direct links are unavailable
Solution Approach 2:
The system implements self-service through automated RACH procedures and capability management. The source gNB autonomously initiates the RACH procedure to establish the Uu link, and the target gNB automatically responds with activation commands. This automated self-service approach reduces manual configuration complexity while enabling sophisticated mobility management signaling capabilities
Data Source
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AI summary
Devices and techniques for supporting inter-node mobility management. An example device may be a first base station. The first base station may include a processor configured to determine that a connection establishment condition has been satisfied. The connection establishment condition may be associated with a satellite position relative to a location. The first base station may initiate a random access channel (RACH) procedure with a second base station based on the connection establishment condition being satisfied. The first base station may establish a Uu link between the first base station and the second base station. The Uu link may be established through a satellite link. The first base station may receive mobility management signaling from the second base station via the Uu link.