Reference Location Timing for Predictive NTN Cell Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing handover procedures in non-terrestrial networks (NTN) due to high propagation delays and dynamic satellite movements, leading to suboptimal network performance and user experience.
Innovation Solution
Implementing a location-based conditional handover (CHO) mechanism that utilizes reference location information to predict and prepare for upcoming cell changes, enhancing the accuracy and efficiency of handover decisions in NTN environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used in NTN, then network coverage is maintained, but handover latency increases and network stability deteriorates due to high propagation delays and dynamic satellite movements
Solution Approach 1:
The patent applies preliminary action by configuring reference locations and associated time points in advance before handover occurs. The wireless device receives configuration including multiple reference locations with respective time points, allowing the device to predict upcoming cell changes and prepare handover parameters beforehand. This advance preparation reduces handover latency and improves network stability in NTN environments with high propagation delays.
2Productivity
If location-based CHO mechanism is implemented, then handover accuracy and efficiency improve, but system complexity increases due to additional reference location information management
Solution Approach 1:
The patent applies universality by configuring reference locations that serve multiple purposes: they provide timing information for handover preparation, enable prediction of satellite movement patterns, and facilitate efficient cell change decisions. The same reference location information supports both timing synchronization and handover optimization, reducing the need for separate complex mechanisms.
Solution Approach 2:
The patent implements feedback by having the wireless device report measured time differences between reference locations and actual signal arrival times. This feedback information is used to adjust handover parameters and improve the accuracy of handover predictions, creating a closed-loop system that adapts to actual NTN conditions while managing complexity through data-driven optimization.
Data Source
AI summary
A method can include receiving, by a wireless device from a base station, one or more radio resource control (RRC) messages. The messages indicate multiple reference locations of a cell. Each reference location of the multiple reference locations corresponds to a respective time point of multiple time points. The messages also indicate a starting time offset of the multiple time points and a periodicity of the multiple time points. The messages further indicate multiple other reference locations of another cell. Each other reference location of the multiple other reference locations corresponds to a respective other time point of multiple other time points. The messages additionally indicate another starting time offset of the multiple other time points and another periodicity of the multiple other time points.