Wireless Device Location Privacy Control via MAC and Power Variation
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Solution Overview
Problem
Existing wireless location services struggle to maintain privacy and security in indoor environments, as GPS is ineffective and WIFI networks may reveal sensitive location information, prompting the need for methods to prevent accurate mapping of wireless devices.
Innovation Solution
Incorporating an Access Point (AP) Mapping Privacy field in Extended Capabilities Information Elements of frames like Beacons and Probe Responses, along with periodic MAC address changes, variable transmit power, and encryption, to control and obscure location data, using ANQP elements and Mobility Services Engine for policy management and monetization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If WIFI networks are employed for providing location services indoors, then location services are available, but location privacy and security are compromised
Solution Approach 1:
The patent introduces an intermediary mechanism where the wireless device itself mediates between location service providers and the user. The device autonomously determines whether to provide location information based on privacy policies, acting as a buffer that prevents direct exposure of location data while still enabling services when appropriate.
Solution Approach 2:
The patent changes the parameter of information disclosure by introducing selective transparency. Instead of always providing location data or never providing it, the system dynamically adjusts the level of information disclosure based on user preferences, policy settings, and contextual factors, allowing location services to operate while maintaining privacy control.
2Object-affected harmful factors
If access point characteristics are made private, then location privacy is protected, but location service functionality is limited
Solution Approach 1:
The patent applies dynamics by making the privacy protection mechanism adaptive rather than static. The system dynamically adjusts its behavior based on real-time conditions such as user presence, policy settings, and service requirements. Location information can be disclosed when needed for legitimate services while remaining private by default, creating a flexible balance between protection and functionality.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors and responds to user preferences, policy changes, and service demands. This feedback loop allows the system to maintain privacy while enabling location services when authorized, adjusting its information disclosure behavior based on ongoing user input and contextual feedback.
3Object-affected harmful factors
If location information is encrypted, then security is improved, but processing complexity increases
Solution Approach 1:
The patent extracts the encryption and decryption operations from the main location processing flow. By separating these security functions into distinct modules handled by the wireless device's processing system, the patent minimizes the complexity impact on core location services while maintaining strong security. The encryption layer is extracted as a dedicated function that operates independently from location determination and service provision.
Data Source
AI summary
In an example embodiment, a wireless device is operable to advertise a policy on the inclusion of the wireless device in a radio frequency map. For example, the wireless device may transmit a signal comprising a field in an extended capabilities information that indicates whether mapping of the wireless device is permissible. As another example, the wireless device may perform certain actions, such as changing media access control address, changing transmit power, and/or vary response times to prevent accurate mapping of the location of the wireless device.