Single-Sided RTT Location Tracking via MAC Address Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately determining the location of user devices within wireless networks, particularly in scenarios where multiple access points and varying network conditions complicate the measurement of round-trip-time data and channel estimation.
Innovation Solution
The method involves transmitting MAC addresses to access points, receiving single-sided round-trip-time data, and performing channel stitching processes to determine user device locations, utilizing tiered communication loops for efficient resource allocation and location tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional two-sided RTT measurement methods are used, then location determination can be performed, but measurement accuracy deteriorates due to network conditions and multiple access points
Solution Approach 1:
The patent segments the RTT measurement process into single-sided measurements performed by individual access points independently. Each access point measures RTT unilaterally without requiring coordination with the target device, dividing the complex two-sided measurement into multiple simpler single-sided measurements that can be aggregated for improved accuracy and reliability.
2Measurement precision
If channel sweeping is performed across multiple frequency bands, then channel estimation accuracy improves, but communication time increases
Solution Approach 1:
The patent performs channel sweeping and estimation in advance before actual data transmission. By pre-establishing channel characteristics across multiple frequency bands, the system prepares channel state information that can be reused for subsequent communications, avoiding repeated time-consuming measurements and reducing real-time communication delays.
Solution Approach 2:
The system implements periodic channel sweeping at scheduled intervals rather than continuously. This periodic approach maintains up-to-date channel estimates for accurate transmission while minimizing the time spent on channel measurements, balancing estimation accuracy with communication efficiency.
3Measurement precision
If single-sided RTT data is collected from multiple access points, then location accuracy improves, but data processing complexity increases
Solution Approach 1:
The patent introduces a location server as an intermediary that centralizes the collection, processing, and triangulation of RTT data from multiple access points. This mediator consolidates the complex computational tasks of aggregating measurements from multiple sources and performing location calculations, simplifying the architecture by centralizing complexity in a dedicated component rather than distributing it across multiple access points and user devices.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may transmit an indication of a media access control (MAC) address associated with an access point to a group of access points included in a network. The network node may receive single-sided round-trip-time (RTT) data associated with a user device associated with the access point, wherein the single-sided RTT data is received from each of the group of access points based at least in part on transmitting the indication of the MAC address to the group of access points. The network node may determine a location of the user device based at least in part on the single-sided RTT data. The network node may transmit an indication of the location of the user device to the access point. Numerous other aspects are described.