SUPL Area Event Handling During Network Handover
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Solution Overview
Problem
The existing Secure User Plane Location (SUPL) architecture struggles to effectively process area events when a registered network changes, particularly during handovers between different service providers or networks.
Innovation Solution
A method is introduced where new event trigger parameters are requested when a network change occurs, involving the exchange of session messages between the home and visited SUPL Location Platforms (H-SLP and V-SLP) to determine cell IDs and initiate periodic positioning checks, ensuring accurate location tracking across network boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing SUPL architecture is used for area event processing, then the basic location service can be provided, but the area event cannot be properly processed when a registered network changes
Solution Approach 1:
The patent applies dynamics by making the SUPL architecture adaptive to network changes. When a terminal detects a network change (handover between different service providers or networks), the system dynamically updates the area event trigger parameters and re-establishes the positioning session with the new visited network's SLP. This dynamic adjustment ensures that area event processing continues reliably across network boundaries without interruption.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal periodically reports its current network status and location information to the H-SLP. When a network change is detected, the terminal provides feedback about the new network identity (MCC/MNC or Network ID/System ID), enabling the H-SLP to identify the appropriate V-SLP in the visited network and re-establish the area event triggering session with updated parameters.
2Measurement precision
If location information is transferred between terminal and location server, then location service is provided, but considerable signaling and location information transfer is required
Solution Approach 1:
The patent applies preliminary action by pre-configuring area event trigger parameters (such as target area, event type, and positioning period) during the initial SUPL session establishment. These parameters are stored and used by the terminal to autonomously determine when area events occur, reducing the need for continuous signaling during normal operation. Only when network changes occur does the system need to re-transmit these parameters, significantly reducing overall signaling complexity while maintaining location measurement accuracy.
Data Source
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AI summary
Disclosed is a location information system based upon a SUPL(Secure User Plane Location) architecture, and more particularly, to a location positioning method based on an area event in handover between networks. The method comprises: if a network is changed or if a terminal is outside of the coverage area of a serving network while an area event is ongoing, requesting, by the terminal, new event trigger parameters to a home network through a first message; determining, by the home network, a serving network of the terminal by using location identifier included in the first message; receiving, the home network, the location identifier of a target area for which the positioning is requested from the determined serving network; and transmitting, the home network, the new event trigger parameters including the area identifier to the terminal through a second message.