Inter-Base Station Uu Link Setup for NTN Mobility Signaling
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Solution Overview
Problem
Existing non-terrestrial networks (NTN) face challenges in managing inter-node mobility due to the dynamic nature of satellite positions and the need for efficient communication between base stations, particularly in scenarios involving satellite payloads with different capabilities and configurations.
Innovation Solution
Implementing a system where a first base station determines connection establishment conditions based on satellite position, initiates a random access channel procedure, and establishes a Uu link with a second base station through a satellite link, enabling mobility management signaling and deactivation of WTRU capabilities as needed, while establishing a Uu interface for inter-gNB communication and tunneling Xn interface information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter-base station communication is established through satellite link in NTN, then mobility management between base stations is enabled, but communication reliability deteriorates due to dynamic satellite positions and link instability
Solution Approach 1:
The patent establishes Xn interface connections between base stations in advance before handover is needed. The source base station and target base station pre-establish communication links through the satellite, so that when handover occurs, the signaling path is already available. This preliminary connection establishment mitigates the reliability issues caused by dynamic satellite positions during actual mobility management operations.
Solution Approach 2:
The satellite acts as an intermediary node that relays communication between geographically separated base stations. The patent utilizes the satellite's positioning and signaling capabilities to facilitate Xn interface establishment, where the satellite serves as a mediator that enables inter-base station communication despite the challenging NTN environment with moving platforms and varying link conditions.
2Productivity
If dedicated resources are allocated for inter-base station communication, then signaling efficiency is improved, but resource utilization deteriorates due to dedicated allocation
Solution Approach 1:
The patent allocates dedicated random access resources specifically for inter-base station signaling purposes, while other resources remain available for normal user communication. This local quality differentiation allows the system to optimize signaling efficiency in the specific context of handover management without permanently dedicating all resources, thereby maintaining overall resource utilization through selective allocation only when needed for base station communication.
3Ease of operation
If WTRU capability is activated for establishing Uu link, then inter-base station communication is enabled, but device complexity increases due to capability management
Solution Approach 1:
The patent implements dynamic activation and deactivation of WTRU capabilities in the base station based on real-time handover requirements. The WTRU capability is activated only when a handover is initiated and deactivated when not needed, transforming a static complex configuration into a dynamic on-demand resource. This approach enables inter-base station communication when required while minimizing the operational complexity by limiting the active duration of the capability.
Solution Approach 2:
The base station temporarily activates WTRU capability, uses it for establishing the Uu link and completing handover signaling, then deactivates and recovers the resource. This pattern of discarding the capability after use and recovering it for future handovers reduces the persistent device complexity while maintaining the ability to perform inter-base station communication when needed.
Data Source
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.