Mobile Station SNPN Selection for Emergency Service Continuity
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Solution Overview
Problem
Current 5G New Radio (NR) technologies face challenges in handling changes in CAG validity between met and not met conditions, particularly in emergency service scenarios, which affect the stability and efficiency of localized service provision in standalone non-public networks (SNPNs).
Innovation Solution
A method is implemented in a mobile station (MS) to determine if an emergency service is ongoing and, if not, perform a SNPN selection procedure upon specific events, such as changes in access validity or emergency PDU session status, ensuring seamless transition and service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MS performs SNPN selection procedure continuously to ensure service availability, then service reliability is improved, but device complexity and energy consumption increase
Solution Approach 1:
The MS performs SNPN selection procedure in advance when validity information changes (before actual service is needed), ensuring the selected SNPN is ready for immediate emergency service access. This preliminary action stores valid SNPN information for future use, avoiding complex real-time selection during emergencies.
Solution Approach 2:
The MS autonomously monitors its own validity information and automatically triggers SNPN selection when validity changes, without requiring external network intervention. This self-service mechanism reduces device complexity by implementing a simple validity-check-triggered selection logic.
2Reliability
If the MS releases all emergency PDU sessions when validity is no longer met, then service integrity is improved, but loss of time occurs during session reestablishment
Solution Approach 1:
The MS performs SNPN selection procedure in advance when validity information changes, ensuring a valid SNPN is already selected and stored before emergency service is needed. This preliminary action prevents time loss during actual emergency sessions by having the network selection pre-configured.
Solution Approach 2:
The system dynamically adjusts the number of active emergency PDU sessions based on validity status: maintaining one session when valid, releasing all when invalid, and allowing rapid reestablishment after validity is restored. This dynamic behavior ensures service integrity while minimizing time loss through efficient session management.
3Duration of action of stationary object
If the MS maintains emergency PDU sessions continuously, then service continuity is improved, but energy consumption increases
Solution Approach 1:
The MS dynamically manages emergency PDU sessions based on SNPN validity status: maintaining one session when validity is met (ensuring continuity), and releasing all sessions when validity is no longer met (reducing energy consumption). This dynamic adaptation balances service continuity with energy efficiency.
Solution Approach 2:
The MS discards (releases) all emergency PDU sessions when SNPN validity is no longer met to conserve energy, and recovers (reestablishes) sessions when validity is restored. This discard-recover mechanism ensures service continuity is maintained only when necessary, optimizing energy consumption.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The method may be performed by a MS. In certain configurations, the MS supports access to a selected standalone non-public network (SNPN) providing access for localized services and is in automatic SNPN selection mode. The MS determines whether the MS has an emergency service ongoing. In response to determining the MS does not have the emergency service ongoing, the MS perform a SNPN selection procedure upon a first event being triggered. In response to determining the MS has the emergency service ongoing, the MS determines whether validity information for the selected SNPN is no longer met. In response to determining that the validity information for the selected SNPN is no longer met, the MS performs local release of all emergency PDU sessions except for an emergency PDU session.