Cell Reselection via Network Time Triggers in NTN
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Solution Overview
Problem
In non-terrestrial wireless communication networks, sudden feeder or service link switches by satellites can lead to delayed cell reselection measurements, causing service disruptions due to reliance on signal quality measurements from serving cells.
Innovation Solution
A cell reselection method that uses time information provided by the network to trigger terminal measurements and reselections, ensuring timely cell reselections even during satellite link changes, by including service start and stop times of serving and neighboring cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cell reselection measurement is triggered based on signal quality of serving cell, then measurement accuracy is improved, but in NTN scenario the measurement cannot be started in time when satellite link switches causing service disruption
Solution Approach 1:
The network side device sends indication information in advance to notify the terminal about upcoming link switches or service changes. This allows the terminal to perform cell reselection measurements before the serving cell stops service, ensuring timely reselection without waiting for signal quality degradation. The indication information includes timing details that enable the terminal to proactively initiate measurements and complete reselection before service interruption occurs.
2Reliability
If terminal waits for signal quality threshold to trigger measurement, then measurement reliability is improved, but service disruption occurs in NTN when satellite link switches suddenly
Solution Approach 1:
The network side device provides feedback information to the terminal about satellite link status and service continuity. This feedback mechanism allows the terminal to adjust its measurement triggering strategy based on network conditions. When the network indicates an upcoming link switch or service change, the terminal receives this feedback and proactively initiates measurements, combining the reliability of threshold-based triggering with the responsiveness needed for NTN scenarios.
Data Source
AI summary
A cell reselection method is provided. The method is performed by a terminal. The method includes receiving a first message, in which the first message includes time information for triggering the terminal to perform a cell reselection.