Portable Terminal Position Estimation Using Reference Data
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Solution Overview
Problem
Portable terminals using assisted GPS mode face delays in detecting initial position due to poor network conditions, which prevent communication with position information servers, leading to failed position detection.
Innovation Solution
The portable terminal employs a position estimating unit that uses stored reference information to estimate its position, allowing it to acquire a position based on this information if server communication fails, and then updates this estimate with more accurate information from the server when available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If assisted GPS mode is used to quickly detect position, then position detection speed is improved, but reliability deteriorates when network conditions are poor
Solution Approach 1:
The portable terminal prestores reference information including base station IDs and their corresponding position data before actual position detection is needed. When assisted GPS mode is activated, the terminal can immediately use this pre-stored reference information to estimate position without waiting for server communication, thus maintaining fast position detection even when network conditions are poor or server communication fails.
2Reliability
If stand-alone GPS mode is used to detect position, then reliability is improved, but position detection time increases
Solution Approach 1:
The position detection process is segmented into two complementary methods: assisted GPS mode using pre-stored reference information for quick estimation, and stand-alone GPS mode for accurate determination. The terminal can switch between or combine these methods based on network conditions and accuracy requirements, thus achieving both fast response and reliable position detection without relying solely on one method.
Data Source
AI summary
An apparatus for acquiring a position of a portable terminal includes a position estimating unit for estimating a position of a portable terminal based on prestored reference information, and a control unit for detecting—the position of the portable terminal using information from a server, wherein when there is a failure to acquire the position information of the portable terminal using the information from the server, the position estimating unit acquires the position of the portable terminal based on the estimated position of the portable terminal.