Reference Location Reporting for NTN Handover Reliability
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Solution Overview
Problem
Existing wireless communication systems, particularly in non-terrestrial networks (NTN), face challenges in accurately determining and managing handover processes due to high propagation delays and dynamic satellite positions, leading to potential reference location failures (RLF) and handover failures.
Innovation Solution
Wireless devices in NTN environments are equipped with mechanisms to report reference locations and distances, using satellite ephemeris data and antenna angles, to facilitate precise handover management and reduce RLFs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices use traditional handover mechanisms in NTN, then network coverage is maintained, but reference location failures occur due to high propagation delays and dynamic satellite positions
Solution Approach 1:
The patent applies preliminary action by having the wireless device report its reference location to the network node before the actual handover occurs. The reference location is determined based on previous positioning information and is transmitted to the network node in advance, allowing the network to prepare handover parameters beforehand. This proactive approach eliminates the need for complex real-time location determination during handover, reducing propagation delay impacts and preventing reference location failures.
Solution Approach 2:
The patent implements feedback by establishing a mechanism where the wireless device continuously reports its reference location to the network node, and the network node uses this feedback information to manage handovers. The reference location reporting creates a closed-loop system where positioning information is continuously updated and fed back to the network, enabling accurate handover decisions even under high propagation delay conditions in NTN environments.
2Measurement precision
If the network determines location in real-time during handover, then location accuracy is maintained, but handover failures occur due to processing time and propagation delays
Solution Approach 1:
The patent applies preliminary action by determining the reference location before the handover process initiates. The wireless device reports its reference location based on previous positioning information, and the network node stores this information in advance. This eliminates the need for complex real-time location determination during handover, reducing processing time and network complexity while maintaining location accuracy for handover decisions.
3Measurement precision
If the wireless device continuously reports location updates, then handover accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by having the wireless device report location updates only when necessary for handover management, rather than continuously. The reference location is reported at specific trigger events such as when the device enters a new tracking area or when handover is anticipated, providing sufficient location information for accurate handovers while minimizing unnecessary signaling overhead. This selective reporting approach balances handover accuracy with signaling efficiency.
Data Source
AI summary
A method can include transmitting, by a wireless device to a third base station, a report indicating radio link failure (RLF) information comprising at least one of a first reference location associated with a first cell of a first base station; a second reference location associated with a second cell of a second base station; a first distance between a location of the wireless device and the first reference location; and a second distance between the location of the wireless device and the second reference location.