Dual SIM Mobile Terminal Emergency Positioning Session Management
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Solution Overview
Problem
Dual SIM mobile terminals face challenges in efficiently managing positioning sessions across multiple subscriptions, particularly during emergency calls, where existing systems lack clear rules for service interactions and data transfer limitations, leading to potential disruptions in location services.
Innovation Solution
A dual SIM mobile terminal system that connects to either SIM card network for positioning sessions, switching between SIM cards if the initial network is unavailable, and prioritizes emergency positioning sessions only on the originating subscription during emergency calls, ensuring no non-emergency sessions are permitted during this time to maintain service fairness and availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mobile terminal allows positioning sessions on both SIM cards simultaneously, then positioning service availability is improved, but service interaction rules become complex and difficult to manage
Solution Approach 1:
The patent segments positioning session management by SIM card state. When a first SIM card is in an active state, positioning sessions are restricted to that SIM card only. When the first SIM card transitions to an inactive state, positioning sessions are then permitted on the second SIM card. This segmentation approach simplifies service interaction rules by creating clear state-dependent permissions for each SIM card.
Solution Approach 2:
The patent implements dynamic positioning session management based on real-time SIM card active/inactive states. The system continuously monitors SIM card states and automatically adjusts which SIM cards are permitted to establish positioning sessions. This dynamic adaptation allows the system to maintain simple service interaction rules while ensuring positioning service availability matches current SIM card operational states.
2Duration of action of stationary object
If the mobile terminal permits positioning sessions on the inactive SIM card, then positioning service continuity is improved, but service fairness and resource allocation become problematic
Solution Approach 1:
The patent applies preliminary action by establishing positioning sessions on the active SIM card before the SIM card transitions to an inactive state. The system proactively manages the lifecycle of positioning sessions, ensuring they are properly terminated or transferred before SIM card state changes occur. This prevents conflicts and ensures service fairness by maintaining clear ownership of positioning sessions throughout state transitions.
Solution Approach 2:
The patent implements feedback mechanisms that continuously monitor SIM card active/inactive states and automatically adjust positioning session permissions accordingly. When a SIM card transitions from active to inactive, the system receives feedback about this state change and responds by restricting new positioning sessions to the remaining active SIM card. This feedback-driven approach maintains service fairness while ensuring continuity of positioning services through proper session management.
Data Source
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AI summary
A dual SIM mobile terminal, such as a Dual SIM Dual Active (DSDA) mobile terminal, connects to a network and performs a user plane or control plane positioning session through the network. When the positioning session is originated by the mobile terminal, either SIM card may be used to connect to its associated network. When the positioning session is originated by another entity in the network, either SIM card may be used for the positioning session. When the mobile terminal connects to a network for an emergency call using either SIM card and an emergency positioning session is performed through the network, the emergency positioning session is permitted only during the emergency call and an emergency callback period and permitted only on a subscription on which the emergency call originated, and no non-emergency positioning sessions with either SIM card is permitted during the emergency positioning session or emergency call.