Bluetooth Geo-Location Using LAP-Derived Time Delays
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Solution Overview
Problem
Existing technologies face challenges in efficiently geo-locating Un-Discoverable Classic Bluetooth Basic Rate (BR) devices, which are essential for various wireless communication applications.
Innovation Solution
A method and system for geo-locating multiple target Bluetooth devices by establishing communications using paging packets with Access Codes derived from the lower address part (LAP) of each device, distinguishing between time delays based on unique LAPs, and determining locations based on these time delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional Bluetooth geo-location methods are used, then single device location can be achieved, but multi-device simultaneous geo-location efficiency is poor
Solution Approach 1:
The patent segments the geo-location process into distinct phases: paging phase (where the master transmits paging packets to multiple slaves simultaneously), connection establishment phase, and time delay measurement phase. By separating these operations and using unique LAPs for each slave during paging, the system enables parallel processing of multiple devices without interfering with each other, thus improving overall productivity.
Solution Approach 2:
The patent applies preliminary action by assigning unique Lower Address Parts (LAPs) to each slave device before the actual geo-location measurement begins. These unique LAPs are embedded in the paging packets transmitted to each slave, allowing the master to pre-configure identification markers that will later be used to distinguish and measure time delays for each individual slave during the geo-location process.
2Reliability
If Un-Discoverable Classic Bluetooth BR devices are targeted, then privacy and security are improved, but device discoverability and geo-location capability deteriorate
Solution Approach 1:
The patent introduces the LAP (Lower Address Part) as an intermediary element that bridges the contradiction between un-discoverability and detectability. The LAP is embedded within the paging packets that are transmitted to and received from Un-Discoverable devices. By using the LAP as an intermediary identifier, the system can measure time delays for geo-location purposes without requiring the devices to be traditionally discoverable, thus maintaining both privacy/security and measurement capability.
Solution Approach 2:
The patent applies local quality by using device-specific unique LAPs that are locally meaningful to each slave device. Each slave receives paging packets with its own unique LAP, allowing the master to distinguish between different slaves based on their individual LAPs. This localized identification mechanism enables precise geo-location of Un-Discoverable devices without compromising their overall un-discoverable status in the Bluetooth network.
Data Source
AI summary
A method and Bluetooth mobile device are disclosed for geo-locating a plurality of target Bluetooth devices. In some embodiments, a method includes distinguishing between time delays associated with received response packets from different target Bluetooth devices based at least in part on Access Codes derived from unique lower address part (LAP) of the received response packets; and determining a location for each of the target Bluetooth devices based at least in part on the time delay associated with the response packet received from the target Bluetooth device.