SNPN Satellite RNA Update After RRC Inactive Cell Reselection
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Solution Overview
Problem
The challenge lies in transitioning a UE operating in a stand-alone non-public network (SNPN) access mode to an RRC inactive state and efficiently performing a registration update with a satellite cell/base station, particularly in scenarios where the UE does not include a public land mobile network (PLMN) identifier in notification area information.
Innovation Solution
A method involving a UE in SNPN access mode receives an RRC release message with suspension configuration information, enters an RRC inactive state, performs cell reselection, and triggers an RNA update if the selected cell is not within the registered SNPN's notification area, utilizing a transceiver and controller to manage this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the UE transitions to RRC inactive state in SNPN access mode, then power saving and network resource efficiency are improved, but the complexity of managing notification area information and performing registration updates increases
Solution Approach 1:
The notification area is segmented into multiple cells, each with its own identification information. The UE stores this segmented cell information in its non-volatile memory, allowing it to efficiently determine whether a newly selected cell falls within the notification area without requiring complex area-wide queries. This segmentation enables simple and efficient tracking area update decisions while maintaining power savings in RRC inactive state.
2Reliability
If the UE performs registration update with satellite cell/base station, then communication reliability is improved, but the time required for transition and registration increases
Solution Approach 1:
The base station performs preliminary action by including suspension configuration information with notification area cell information in the RRC release message before the UE actually needs to perform registration update. This allows the UE to pre-load necessary cell information into its non-volatile memory during the transition to RRC inactive state, so that when registration update is needed, the UE can quickly determine the appropriate actions without time-consuming queries or re-transmissions.
3Speed
If the UE stores cell information in non-volatile memory, then the speed of determining notification area membership is improved, but the memory requirements and device complexity increase
Solution Approach 1:
The UE stores only the necessary cell identification information (such as cell global identifier or equivalent) in its non-volatile memory rather than storing complete cell configuration data. This partial storage approach provides sufficient information for the UE to quickly determine whether a selected cell falls within the notification area through simple comparison operations, while minimizing the memory footprint and avoiding excessive storage requirements.
Data Source
AI summary
The present invention relates to a method performed by a terminal operating in a stand-alone non-public network (SNPN) connection mode in a communication system. The method comprises the steps of: receiving, from a base station, a radio resource control (RRC) release message including reservation configuration information; entering an RRC deactivation state on the basis of the RRC release message; performing a cell reselection procedure; and triggering an RNA update procedure when a cell selected according to the reselection procedure is not included in cell information included in notification area information.