NTN-TN Cell Reselection for Paging-Aware RNA Changes
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing transitions between terrestrial and non-terrestrial networks, particularly in scenarios involving radio access network changes and state transitions for wireless transmit-receive units.
Innovation Solution
The system enables wireless transmit-receive units (WTRUs) to evaluate and perform cell reselections between terrestrial and non-terrestrial networks based on specific conditions, such as signal strength and priority, while monitoring for paging messages and transitioning between RRC states to optimize network connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a WTRU performs cell reselection evaluation for TN cells while camping on an NTN cell, then the WTRU can maintain connectivity with terrestrial networks, but the device complexity and processing overhead increase
Solution Approach 1:
The patent segments the cell reselection evaluation process by introducing specific conditions and parameters for NTN-TN interworking. The WTRU evaluates TN cells separately from NTN cells using distinct criteria, including checking whether the WTRU is configured to monitor for paging messages from the NTN cell before performing TN cell reselection evaluation. This segmentation reduces processing complexity by avoiding unnecessary evaluations.
Solution Approach 2:
The patent applies preliminary action by configuring the WTRU with specific parameters and conditions before cell reselection evaluation. The network provides configuration information indicating whether the WTRU should evaluate TN cells, and the WTRU checks this configuration beforehand. This preliminary setup prevents unnecessary processing and reduces device complexity while maintaining adaptability.
2Reliability
If a WTRU monitors for paging messages from NTN cell in RRC_INACTIVE state, then the WTRU can receive network notifications, but the monitoring time and energy consumption increase
Solution Approach 1:
The patent implements periodic action by configuring the WTRU to monitor for paging messages at specific intervals rather than continuously. The network provides configuration information that defines when and how the WTRU should monitor for paging messages from the NTN cell. This periodic monitoring approach maintains reliability while reducing time loss compared to continuous monitoring.
Solution Approach 2:
The patent applies partial action by having the WTRU monitor for paging messages only under specific conditions rather than always. The WTRU checks whether it is configured to monitor for paging messages from the NTN cell before initiating monitoring. This conditional monitoring reduces time consumption while maintaining necessary reliability for receiving important network notifications.
3Reliability
If a WTRU performs cell reselection based on multiple conditions including paging message monitoring configuration, then the network interworking reliability improves, but the processing time and complexity increase
Solution Approach 1:
The patent uses preliminary action by pre-configuring the WTRU with all necessary parameters and conditions for cell reselection before the actual reselection process. The network provides configuration information indicating whether the WTRU should evaluate TN cells and under what conditions. This preliminary configuration allows the WTRU to perform fast cell reselection decisions without extensive real-time processing, thus improving reliability while minimizing processing time.
Solution Approach 2:
The patent segments the cell reselection decision process into distinct evaluation stages. The WTRU first checks configuration conditions, then evaluates TN cells only if specific conditions are met (such as being configured to monitor for paging messages). This segmented approach organizes the processing logically, improving reliability through systematic evaluation while reducing overall processing time by avoiding unnecessary evaluation steps.
Data Source
AI summary
A wireless transmit-receive unit (WTRU) may camp on a non-terrestrial network (NTN) cell and evaluate one or more terrestrial network (TN) cells, for example, to determine whether to change a radio access network (RAN) based notification area (RNA). In examples, the WTRU may receive an indication to change from a first TN cell to the NTN cell. The WTRU may perform, based on the indication, a cell reselection to the NTN cell. The first TN cell may be associated with a first RNA. The WTRU may evaluate a second TN cell associated with a second RNA. The WTRU may determine that a cell reselection condition associated with the second TN cell is satisfied. The WTRU may perform, based on the determination that the cell reselection condition is satisfied, a cell reselection to the second TN cell.