Directional Beacon WLAN Client Location
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Solution Overview
Problem
Existing WLAN technologies face challenges in accurately determining the location of client stations without requiring hardware changes to Access Points or client devices, and existing methods often rely on encrypted connections or network association, limiting their effectiveness.
Innovation Solution
The method involves Access Points transmitting beacon signals with direction-specific information in multiple directions using beam-forming technology, allowing client devices to calculate their location based on received signals from multiple Access Points without encryption or network association, using triangulation and signal strength analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional WLAN location methods (RSS, TDOA) are used, then location determination is possible, but accuracy is insufficient and requires hardware modifications or encrypted connections
Solution Approach 1:
The Access Point uses its existing multiple antennas to transmit beacon signals in different directions without requiring additional location determination hardware. The system leverages the AP's own infrastructure (antennas and beacon transmission capability) to provide location services, eliminating the need for specialized hardware modifications while achieving accurate location determination through directional beacon analysis
2Ease of operation
If encrypted connections or network association are required for location determination, then security is maintained, but accessibility and ease of operation are reduced
Solution Approach 1:
The location determination function is extracted from the encrypted network association process. By using unencrypted beacon signals that contain directional information, the system separates location determination from authenticated network connection, allowing clients to determine their location without needing to establish secure encrypted connections or associate with the network, thereby improving accessibility while maintaining security for actual data transmission
3Measurement precision
If directional beacon signals with identifier information are transmitted, then location determination accuracy is improved, but signal transmission complexity increases
Solution Approach 1:
The beacon signal serves multiple functions simultaneously: it provides standard WLAN network information for client association and contains additional directional identifier information for location determination. By making the beacon signal multi-functional, the system transmits location information using existing protocol infrastructure without requiring separate dedicated location signals, thereby improving accuracy while minimizing additional complexity
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 enables accurate location determination of client stations without hardware modifications, improving accuracy by up to 80% over traditional methods like RSS and TDOA, and can be implemented with existing WLAN protocols, supporting both indoor and outdoor environments.
Implementation Method 1
The method involves Access Points transmitting beacon signals with direction-specific information in multiple directions using beam-forming technology
Data Source
Figure 1A~1B
Figure 1C
Figure 2
AI summary
An access point device, in particular for a wireless local area network (WLAN), including a plurality of antennas, a transmitter configured to transmit a first beacon signal in a first direction, using at least one of the antennas, and transmit a second beacon signal in a second direction, which is different from the first direction in azimuth and/or elevation, using at least one of the antennas. A client device, in particular for a WLAN, including at least one antenna, and a processor configured to receive at least two beacon signals from at least two access point devices, and estimate location information, in particular longitude, latitude, and/or height of each of the at least two access point devices, based on the at least two beacon signals, in particular based on a content of the signal and/or a power value of the signal. Related apparatus and methods are also described.