BLE UHF Vehicle Access With Multi-Event RSSI Positioning
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Solution Overview
Problem
The existing 'hands-free' access systems for vehicles using Bluetooth Low Energy (BLE) communication struggle with precise location detection of portable items due to imprecise RSSI measurements, leading to delayed vehicle unlocking and potential security risks, as they require multiple measurements and are limited by the Android operating system's transmission period.
Innovation Solution
An ultra-high-frequency communication method using BLE protocol between 2.4 GHz and 2.5 GHz, where additional signaling events with distinct identifiers are transmitted during a predetermined period, allowing for multiple RSSI measurements within the same time frame, thereby improving location precision and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple RSSI measurements are taken to improve location precision, then measurement precision improves, but loss of time increases due to the Android operating system's transmission period limitation
Solution Approach 1:
The system performs preliminary actions by transmitting multiple signaling events with distinct identifiers within a single advertising period, preparing multiple RSSI measurements in advance. This allows the vehicle to have location precision data ready before the unlocking decision is needed, eliminating the delay caused by sequential measurements.
Solution Approach 2:
The patent maintains continuity of useful action by continuously transmitting multiple signaling events without interruption within the advertising period. Instead of waiting for one measurement to complete before taking the next, the system continuously generates multiple measurements simultaneously, ensuring uninterrupted data flow for immediate unlocking decisions.
2Productivity
If multiple signaling events are transmitted within a predetermined period, then productivity improves by increasing RSSI measurements per unit time, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the signaling process into multiple distinct signaling events, each with a unique identifier. Instead of one complex continuous signal, the system segments the transmission into discrete, identifiable events (first signaling event, second signaling event, etc.), making the complex task of multiple measurements manageable and organized.
Solution Approach 2:
The system changes parameters by varying the event identifier parameter across different signaling events within the same advertising period. By modifying this identifier parameter (first event identifier, second event identifier, etc.), the system can distinguish between multiple measurements without changing the fundamental communication protocol, thus increasing productivity while controlling 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 method enables faster and more reliable detection of the portable item's presence around the vehicle, reducing the 'wall effect' and enhancing security by increasing the number of RSSI measurements per unit time, allowing for quicker activation of vehicle functions.
Implementation Method 1
an ultra-high-frequency communication method using BLE protocol between 2.4 GHz and 2.5 GHz
Implementation Method 2
The measurement of the power of the signal, originating from each LF antenna, received by the portable item of equipment is received and analyzed by a locating device on board the vehicle
Data Source
AI summary
A UHF communication method for activating a motor vehicle function with a portable item of user equipment, based on the presence of the portable item of equipment in predetermined areas around the vehicle. The portable item transmitting a first signaling event at a predetermined period on at least one signaling channel. The first event including at least one signaling frame having a data block. The method including: a predetermined number of additional signaling events transmitted to the vehicle during the period; a request signal received from the vehicle, for each signaling frame of each event received by the vehicle; sending a response frame upon receipt of the request signal by the portable item; determining the presence of the portable item in one of the predetermined areas based on the strength values of the received signal; activating a vehicle function based on the determined presence of the portable item of equipment.