Roaming Network Selection With Timer-Based PLMN Switching
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Solution Overview
Problem
In roaming scenarios, user equipment (UE) in a connected state cannot perform PLMN reselection without affecting ongoing high-priority services, leading to potential service interruptions.
Innovation Solution
Implement a timer-based system where a network side device issues roaming information with a PLMN list and a timer, allowing terminals to switch to a higher-priority VPLMN after the timer expires, unless a rejection instruction is received during a non-emergency service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PLMN reselection is performed in connected state, then network priority optimization is improved, but service interruption occurs
Solution Approach 1:
The system performs preliminary network selection in idle state and stores the result, then uses this pre-selected network as the default during connected state. When roaming information becomes available, the system can switch networks without interrupting ongoing services, as the switching occurs after the service has been established on the target network.
Solution Approach 2:
The system dynamically adjusts network selection behavior based on service state. In idle state, automatic PLMN selection is performed to optimize network priority. In connected state, the system maintains the current network connection to ensure service continuity, but can dynamically switch to a pre-selected network when roaming information is received and services allow it.
2Reliability
If automatic PLMN selection is performed only in idle state, then service interruption is avoided, but network optimization opportunity is lost
Solution Approach 1:
The system performs automatic PLMN selection in advance during idle state and stores the selected network information. This preliminary action ensures that when the device needs to switch networks during connected state, the target network is already prepared, allowing optimization without service interruption.
Solution Approach 2:
The system introduces an intermediary mechanism (timer-based notification system) that mediates between network optimization requirements and service continuity. The timer allows the system to prepare network switching information in advance while the notification mechanism ensures user awareness and consent before actual switching occurs.
3Ease of operation
If timer-based network switching is implemented, then user experience is improved, but system complexity increases
Solution Approach 1:
The system implements self-service by automatically managing the timer and network switching process without requiring manual user intervention. The timer automatically expires after a predetermined duration, triggering the network switching process automatically based on pre-configured parameters, reducing the need for complex user interaction mechanisms.
Solution Approach 2:
The system uses parameter changes (timer duration, notification timing, switching conditions) to simplify the overall system complexity. By adjusting these parameters, the system achieves smooth network switching with minimal user impact, avoiding the need for complex real-time monitoring and decision-making mechanisms.
Data Source
AI summary
The present invention provides a roaming network selection method, a system, an electronic device and a storage medium, which are applicable to a terminal in a connected state at a roaming place. Said method includes receiving steering of roaming information containing a PLMN list and a timer issued by a network side device; determining whether a current service is an emergency service; starting the timer when the current service is a non-emergency service, and outputting notification information, so as to notify that network switching is to be performed after the timer expires; and performing network selection according to the PLMN list after the timer expires when no switching rejection instruction in response to the notification information is received. The present invention enables UE in a connected state at a roaming place to access a VPLMN with a higher priority, without affecting the running high-priority service.