Angle of Arrival Authentication for Wireless Pairing

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Solution Overview

Problem

Existing wireless communication authentication methods, such as those using Bluetooth Low Energy (BLE), face challenges in accurately restricting access to devices due to reliance on visible password codes, button presses, or received signal strength, which can lead to undesired pairings with non-selected devices within communication range.

Innovation Solution

Implementing angle of arrival (AoA) authentication to restrict pairing or bonding to devices transmitting signals from a predefined permitted range relative to the orientation of the first wireless device, allowing only authorized devices to establish connections without requiring physical access or password input.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If RSSI-based filtering is used to restrict access, then device proximity authentication is attempted, but authentication accuracy deteriorates due to strong radio signals being received from devices outside the desired threshold distance range

Engineering Contradiction:

Improveauthentication accuracyVSAvoidproximity measurement accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent changes the authentication parameter from RSSI (signal strength) to AoA (angle of arrival). By measuring the directional angle of incoming signals instead of their strength, the system can accurately identify which device a user is pointing at, eliminating the problem of strong signals from unintended devices causing false authentication.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If visible password codes are used for authentication, then access restriction is achieved, but ease of operation deteriorates because users need visual access to the device to see the printed password code

Engineering Contradiction:

Improveaccess securityVSAvoidauthentication convenience

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the mechanical/visual authentication system (printed password codes requiring visual access) with a wireless directional system. The user simply points their device at the target device, and the AoA measurement automatically identifies the intended target, eliminating the need for visual code reading while maintaining security.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The directional authentication system serves multiple functions: it provides access security, eliminates the need for visual access to password codes, prevents unintended pairings, and works without requiring physical contact or button presses on the target device.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If button presses or display touches are required for authentication, then access control is achieved, but device complexity increases due to additional hardware components

Engineering Contradiction:

Improveaccess controlVSAvoidhardware requirements

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system uses the wireless communication signals themselves to carry authentication information. The target device's own transmitted signals are analyzed for their angle of arrival, eliminating the need for separate buttons, displays, or physical interfaces. The authentication is performed using the existing wireless communication infrastructure.

Inventive Principle:

Principle #25Self-service

4Measurement precision

If directional authentication using AoA is implemented, then pairing accuracy with intended devices is improved, but ease of operation may worsen due to requiring antenna positioning within a predefined permitted range

Engineering Contradiction:

Improvedevice identification accuracyVSAvoidauthentication simplicity

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The system dynamically adjusts the permitted AoA range based on the specific application and environment. The authentication system can accommodate different levels of directional precision requirements, allowing flexibility in balancing security and ease of use depending on the use case.

Inventive Principle:

Principle #15Dynamics

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

Ensures secure and accurate pairing or bonding with intended devices by directional authentication, preventing unwanted connections from other devices within range, while simplifying the user experience by eliminating the need for physical access or password entry.

Implementation Method 1

determine whether to initially authenticate a wireless connection with a second wireless device based on a comparison between an angle of arrival (AoA) of a first wireless signal received from the second wireless device

Methodology Applied

Scientific EffectAngle of arrival (AoA):

Data Source

PatentUS11805414B2Systems and methods for initial authentication of wireless communication

Publication Date: 2023.10.31 SILICON LABORATORIES INC

AI summary

Systems and methods are provided that may be implemented to use angle of arrival (AoA) of a signal transmitted between two Bluetooth Low Energy (BLE) wireless devices to initially authenticate a connection between the two BLE devices. In one example, bonding or pairing with a first BLE device may be restricted to only those other BLE devices having an antenna currently positioned to transmit a signal to the first BLE device from an allowed direction and within a predefined permitted range of AoA relative to the first BLE device.