Access Reader Coordination Using BLE and UWB Intent Ranging

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing access control systems using near field communication technologies lack accurate physical tracking of devices, making it difficult to determine user intent for secure area access, leading to potential delays and inefficiencies.

Innovation Solution

Integration of ultra-wide band (UWB) ranging with low-energy wireless protocols like Bluetooth Low Energy (BLE) for secure credential exchange, enabling precise location tracking of credential devices to determine user intent, and coordinating multiple readers for load balancing and efficient access control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If UWB ranging is performed continuously by all readers, then location accuracy is maintained, but power consumption and system complexity increase

Engineering Contradiction:

Improvelocation accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The system dynamically adjusts the ranging operation state of different readers based on real-time credential device locations and access control requirements. Readers transition between active ranging, standby, and inactive states, optimizing power consumption while maintaining location accuracy where needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system performs preliminary credential exchange via BLE to identify potential access candidates before activating UWB ranging. This preliminary action filters down the number of devices requiring precise tracking, reducing overall power consumption while maintaining accuracy for relevant devices.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If multiple readers perform ranging simultaneously, then authentication reliability is improved, but authentication latency increases

Engineering Contradiction:

Improveauthentication reliabilityVSAvoidauthentication latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The authentication process is segmented into two phases: initial credential exchange via BLE and subsequent UWB ranging for verification. This segmentation allows parallel processing of credential validation while sequential execution of precise ranging, improving overall efficiency without sacrificing reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system uses an intermediary coordination mechanism where the first reader that detects a credential device shares authentication context with other readers. This intermediary approach allows coordinated ranging operations that maintain reliability while reducing redundant authentication steps and latency.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If all readers monitor all credential devices, then access control security is enhanced, but system complexity and processing load increase

Engineering Contradiction:

Improveaccess control securityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Each reader is assigned specific monitoring responsibilities based on its location and the proximity of credential devices. Instead of universal monitoring, readers focus their attention locally on devices in their vicinity, reducing system complexity while maintaining security through coordinated coverage.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system performs preliminary filtering using BLE to identify credential devices that are actually attempting access. This preliminary action allows the system to focus complex UWB ranging operations only on relevant device-reader pairs, reducing processing load while maintaining security for genuine access attempts.

Inventive Principle:

Principle #10Preliminary action

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

Enhances access control accuracy to tens of centimeters, reduces authentication latency, and optimizes power consumption by terminating unnecessary ranging, thereby improving system efficiency and user experience.

Implementation Method 1

UWB can be used in radar operations, providing localization accuracies on the scale of tens of centimeters

Methodology Applied

Scientific EffectTime of flight: Time of Flight

Implementation Method 2

Ultra-wide band (UWB) is a radio frequency (RF) technique that uses short, low power, pulses over a wide frequency spectrum

Methodology Applied

Scientific EffectUltra-wide band electromagnetic radiation: Electromagnetic Induction

Data Source

PatentEP4325452B1Reader coordination for access control

Publication Date: 2025.12.10 ASSA ABLOY AB

Figure 1
Figure 2
Figure 3

AI summary

Systems and methods for access control systems includes first and second access facilities, and first and second readers. The first reader is configured to control access through the first access facility, receive a credential using a first communication protocol from a device that stores the credential, and establish a secret with the device using the credential. The second reader is configured to control access through the second access facility. The first reader is configured to provide the secret to the second reader, and the second device is further configured to perform ranging using the secret and a second communication protocol different than the first communication protocol to identify intent information. Access through one of the first facility or the second facility is coordinated using the intent information.