H-SLP Triggering for SUPL Positioning Period Reliability
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Solution Overview
Problem
In conventional triggered location services, if the Target SET misses the positioning period due to a timer error or power turn-off, it fails to transmit the SUPL POS INIT message, leading to incomplete location value calculation and disrupted service.
Innovation Solution
The H-SLP and Target SET jointly check the positioning period, with the H-SLP transmitting a positioning initiating message to the Target SET if the SUPL POS INIT message is not received within the specified time, ensuring the service is started reliably.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Target SET autonomously checks the positioning period and transmits the SUPL POS INIT message, then the positioning can be performed according to the scheduled period, but the service reliability deteriorates when the Target SET misses the positioning period due to timer errors or power turn-off
Solution Approach 1:
The H-SLP monitors whether the Target SET has transmitted the SUPL POS INIT message within the expected time window. If the message is not received, the H-SLP sends a triggering message to initiate positioning again. This feedback mechanism ensures that positioning occurs reliably even when the terminal's local timer fails, resolving the contradiction between autonomous operation efficiency and service reliability.
Solution Approach 2:
The H-SLP acts as an intermediary that bridges the gap between the scheduled positioning requirement and the actual message transmission. By introducing the H-SLP's monitoring and re-triggering function, the system ensures that positioning is performed reliably without requiring the terminal to perfectly maintain local timing, thus resolving the reliability issue while preserving efficiency.
2Device complexity
If the H-SLP waits for the SUPL POS INIT message from the Target SET, then the system structure remains simple, but the positioning cannot be started if the Target SET fails to transmit the message within the specific period
Solution Approach 1:
The H-SLP implements a feedback mechanism where it monitors for the SUPL POS INIT message and, upon failure to receive it within the expected period, sends a triggering message to the Target SET. This adds minimal complexity to the system structure while dramatically improving positioning initiation reliability, as the H-SLP actively ensures positioning occurs even when the terminal fails to initiate it.
Solution Approach 2:
The H-SLP performs a preliminary check to determine whether the SUPL POS INIT message has been received before proceeding with positioning. This preliminary action allows the system to detect failures early and trigger corrective action (sending the triggering message) before positioning is delayed or lost, thereby improving reliability without significant structural complexity.
Data Source
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AI summary
A method for providing a location value of a Target (SET) (306) in a location information providing system is provided, wherein an Home Secure User Plane Location (SUPL) Location Platform (H-SLP) (304) also checks a period for a positioning and it transmits a positioning start inducing message (328) to the Target SET (306) if an Secure User Plane Location (SUPL) TRIGGERED START message does not arrive from the Target SET within a specific time interval from a beginning of the corresponding period. Therefore, there is a complementary effect on that the positioning can be performed in the preset period.