RSSI-Based Position Determination for Portable Internet Terminals
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Solution Overview
Problem
Existing position determination methods for mobile communication terminals in portable Internet systems face challenges in accurately determining location, especially when signals from neighbor Base Stations (BS) are weak or obstructed, leading to reduced accuracy and success rates.
Innovation Solution
A method and system utilizing the Received Signal Strength Indicator (RSSI) to determine the position of a mobile communication terminal by scanning neighbor BSs, measuring signal strengths, and using the ID of the BS with the strongest signal above a threshold to enhance position determination accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If GPS signal-based position determination is used, then position determination is easy when sky is clear, but position determination becomes impossible in shadow areas or indoors where GPS signal is weak
Solution Approach 1:
The patent changes the measurement parameter from GPS signal strength to RSSI (Received Signal Strength Indicator) of base station signals. This parameter change enables position determination to work reliably in indoor and shadow area environments where GPS signals are blocked, while maintaining operational simplicity through automated RSSI-based location identification.
2Measurement precision
If pilot signal-based position determination is used, then position can be determined using signals from neighbor BSs, but detection fails when terminal is very close to a BS causing signal strengthening
Solution Approach 1:
Instead of relying on weak neighbor BS signals to determine position (which fails when close to a BS), the patent inverts the approach by using the strong signal from the serving BS and identifying the terminal's location based on which BS has the strongest RSSI. This inversion resolves the detection failure issue by turning the strong signal from the nearest BS into a useful positioning indicator rather than an interference problem.
3Measurement precision
If RSSI-based position determination is used, then position accuracy is enhanced in portable Internet system, but requires scanning and measuring multiple BS signals
Solution Approach 1:
The patent makes the RSSI measurement process multi-functional by having the terminal scan and measure base station signals for both connection management and position determination purposes. This universal approach allows the same signal strength measurements to serve dual functions, reducing the need for separate complex measurement procedures and simplifying the overall process despite the enhanced positioning capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases the success rate and accuracy of position determination by effectively using RSSI to identify the strongest signal, even when signals from neighbor BSs are weak or obstructed, thereby improving positional accuracy and performance.
Implementation Method 1
scanning the neighbor BSs while measuring RSSIs for the main BS and the neighbor BSs
Data Source
AI summary
Provided are a system and method for determining a position based on portable Internet in a portable Internet system. The method includes receiving, by the terminal, information on neighbor base stations (BSs) from a main BS, scanning the neighbor BSs while measuring Received Signal Strength Indicators (RSSIs) for the main BS and the neighbor BSs, determining whether the RSSI for the main BS is greater than a preset threshold value, and deciding, as a position of the terminal, a position associated with an IDentification (ID) of the main BS when the RSSI is greater than the threshold value.