Wireless RTT Ranging Using Single Source Address
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Solution Overview
Problem
Computing devices that perform wireless RTT ranging repeatedly consume significant energy, leading to battery drain and user dissatisfaction, especially in battery-powered portable devices providing location-based services.
Innovation Solution
Implementing wireless RTT ranging using fewer than all addresses of a wireless device by identifying situations where multiple source addresses are used and performing RTT ranging with only one address, reducing the number of communications and conserving energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless RTT ranging is performed repeatedly using all addresses of a wireless device, then location-based services can be provided, but energy consumption increases significantly
Solution Approach 1:
The patent extracts and removes redundant RTT ranging operations by identifying that a single RTT measurement can serve multiple addresses associated with the same wireless device. Instead of performing separate RTT ranging for each address, the system performs RTT ranging once and applies the result to all addresses, thereby eliminating unnecessary energy-consuming communications while maintaining location determination accuracy.
Solution Approach 2:
The patent applies partial action by performing RTT ranging with fewer communications than traditionally required. By determining that one RTT measurement suffices for multiple addresses, the system performs only the necessary minimum action rather than excessive repeated measurements, reducing energy consumption while still achieving reliable location-based services.
2Reliability
If wireless RTT ranging is performed repeatedly, then location-based services are maintained, but battery life is reduced
Solution Approach 1:
The patent removes redundant RTT ranging operations by identifying that a single measurement serves multiple addresses. This extraction of unnecessary communications directly reduces battery consumption while maintaining continuous location-based service availability through the shared RTT result.
Solution Approach 2:
The patent implements periodic RTT ranging only when necessary, rather than continuously for each address. By establishing that one RTT measurement can serve multiple addresses over a period, the system reduces the frequency of energy-consuming operations while maintaining service availability throughout the operational duration.
3Loss of information
If RTT ranging is performed with all addresses, then complete location data is obtained, but communication overhead increases
Solution Approach 1:
The patent extracts and eliminates redundant communication by determining that a single RTT ranging operation provides sufficient location data for multiple addresses. This removes unnecessary communication overhead and time consumption while maintaining complete location information through the shared measurement result.
Solution Approach 2:
The patent merges the location data utility across multiple addresses by applying a single RTT measurement result to all addresses associated with the wireless device. This combining approach maintains complete location information availability while significantly reducing communication time and overhead.
Data Source
AI summary
A computing device initiates wireless RTT ranging communication with a wireless device by specifying a source address (e.g., a MAC address or BSSID) of the wireless device in frames sent to the wireless device. The computing device determines situations in which a wireless device is using multiple source addresses. If a wireless device is using multiple source addresses, the computing device performs wireless RTT ranging with the wireless device using less than all (e.g., a single one) of the multiple source addresses. The computing device performs wireless RTT ranging with less than all of the source addresses used by the wireless device because the distance between the computing device and the wireless device is the same regardless of which of the multiple source addresses the wireless device is using.