Roaming Terminal Area Event Triggered Positioning
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Solution Overview
Problem
Existing SUPL-based mobile communication systems lack area-based and area event triggered positioning capabilities for roaming terminals, which are essential for efficient location services.
Innovation Solution
A network-initiated area event triggered positioning method is introduced, where the home network requests and obtains area IDs from the visited network, allowing the roaming terminal to determine if it has entered or exited a specific area, and initiates positioning only when the terminal approaches the specified area, using either proxy or non-proxy modes with the SUPL Positioning Center or Location Center.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous positioning is performed for roaming terminals, then positioning accuracy is maintained, but signaling overhead and network load increase significantly
Solution Approach 1:
The patent implements periodic positioning by establishing area event triggers that initiate positioning only when the terminal enters or exits predefined geographic areas. This transforms continuous positioning into periodic, event-driven positioning, reducing signaling overhead while maintaining positioning accuracy when needed.
Solution Approach 2:
The patent performs preliminary actions by pre-defining area boundaries and event triggers before the terminal arrives. The home SLP pre-configures area information and trigger conditions, so that when the terminal enters the visited network, positioning is automatically initiated only when area events occur, avoiding continuous positioning signaling.
2Productivity
If area-based positioning is implemented for roaming terminals, then positioning efficiency improves, but system complexity increases due to area management
Solution Approach 1:
The patent introduces the home SLP as an intermediary that manages area information and coordinates between the visited network and positioning services. The home SLP receives area event notifications from the visited SLP, retrieves pre-stored area information, and processes positioning requests, thereby simplifying the overall system architecture while enabling area-based positioning.
Solution Approach 2:
The home SLP performs multiple functions: it stores area information for multiple terminals, receives area event notifications from visited networks, initiates positioning requests, and manages trigger conditions. This multi-functionality reduces the need for separate area management systems, simplifying the overall system while improving positioning efficiency.
3Loss of energy
If positioning is initiated only on area events, then network resources are conserved, but positioning response time may increase
Solution Approach 1:
The patent performs preliminary actions by pre-configuring area boundaries, event triggers, and positioning parameters before the terminal enters the visited network. When area events occur, the home SLP can immediately initiate positioning using pre-prepared information, reducing the actual positioning response time while still conserving network resources compared to continuous positioning.
Data Source
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AI summary
A network-initiated area event triggered positioning method for a roaming terminal in a session-based position information system is disclosed. Network-initiation of area-based positioning of a roaming terminal is discriminated according to a proxy mode and a non-proxy mode, and area-based positioning for the roaming terminal is performed in various manners according to whether an SLP for performing the positioning procedure with respect to the discriminated modes is a V-SLP or an H-SLP.