NTN-TN Cell Reselection Using TN Area Filtering
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Solution Overview
Problem
The integration of non-terrestrial and terrestrial communication services in overlapping areas leads to frequent cell reselection, resulting in increased measurement activities, network signaling, higher power consumption, and 'ping-pong' effects, which degrade user experience and battery performance.
Innovation Solution
A method for optimizing cell reselection in NTN-TN overlapping areas by utilizing TN area information from SIB 25 to filter unnecessary frequency measurements and allowing the UE to remain on an NTN cell based on user preference and power-saving modes, thereby reducing unnecessary measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cell reselection is performed frequently in overlapping areas to maintain service continuity, then adaptability is improved, but power consumption increases and user experience deteriorates
Solution Approach 1:
The patent applies preliminary action by providing TN coverage information in advance through SIB 25 before the UE actually needs to perform cell reselection. This allows the UE to pre-know about TN coverage areas and make informed decisions about whether to perform measurements, avoiding unnecessary power consumption while maintaining service continuity.
Solution Approach 2:
The patent enables self-service by allowing the UE to autonomously determine whether to perform cell reselection measurements based on the TN coverage information it receives. The UE can independently evaluate its location relative to TN coverage areas and make intelligent decisions about measurement activities, reducing unnecessary power consumption while maintaining adaptability.
2Reliability
If cell reselection measurements are performed for all neighbor cells to ensure reliable connectivity, then reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies the taking out principle by extracting and providing specific TN coverage information through SIB 25 that is relevant to the current NTN cell. This allows the UE to focus measurements only on specific TN cells within the indicated coverage areas, rather than performing exhaustive measurements on all possible neighbor cells, thereby reducing measurement complexity while maintaining connectivity reliability.
3Adaptability or versatility
If comprehensive TN coverage information is provided to enable accurate cell reselection decisions, then adaptability is improved, but network signaling overhead increases
Solution Approach 1:
The patent applies local quality by providing TN coverage information specifically tailored to the current NTN cell's context through SIB 25. Rather than providing universal or overly comprehensive TN coverage data, the network provides localized information about TN cells that are actually relevant to the UE's current location and situation, achieving accurate reselection decisions with minimized signaling overhead.
Data Source
AI summary
A method for cell selection/reselection in a non-terrestrial network (NTN)-terrestrial network (TN) overlapping coverage area within a communication network is provided. The method includes obtaining, by a user equipment (UE) from an NTN cell, TN area information of one or more neighbor TN areas, obtaining, by the UE from at least one TN cell, frequency information based on the obtained TN area information, determining, by the UE, at least one neighbor TN cell to perform cell selection/reselection measurements based on the obtained frequency information, and performing, by the UE, cell selection/reselection measurements of the at least one determined neighbor TN cell.