UWB Access Control With Door-Side Detection and Travel-Time Checks
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Solution Overview
Problem
Access control systems face challenges in accurately determining the side of a door from which a user approaches, leading to potential unauthorized access when an authorized user looks through a peephole, as existing systems may unlock without proper credential verification.
Innovation Solution
An access control device uses ultra-wideband (UWB) technology to determine the side of a passageway by analyzing UWB data, including distance and signal-to-noise ratio, and estimates travel time to accurately identify whether a user is on a secure or unsecure side, enabling automatic lock control without user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access control device uses traditional credential verification systems, then the user can gain access by presenting a credential, but the system cannot accurately determine the side of the door from which the user approaches, leading to potential unauthorized access
Solution Approach 1:
The patent introduces UWB (Ultra-Wideband) technology as an intermediary measurement system between the access control device and the user. The UWB subsystem measures the distance to the mobile device and analyzes signal characteristics (SNR differences across multiple antennas) to indirectly determine which side of the door the user is on, without requiring direct line-of-sight or physical contact with the credential
Solution Approach 2:
The patent replaces traditional mechanical or contact-based credential verification with wireless UWB-based ranging and signal analysis. Instead of requiring physical presentation of a credential to a reader, the system uses electromagnetic wave propagation characteristics (distance measurements, signal-to-noise ratios) to infer user location and intent, eliminating the need for active physical actions
2Productivity
If the access control device automatically unlocks when a credential is detected, then access is granted quickly, but the system may unlock when the user is on the secure side (e.g., looking through peephole), creating security vulnerabilities
Solution Approach 1:
The patent performs preliminary determination of the user's side of the door using UWB distance and SNR analysis before granting access. The system calculates the expected distance if the user were on the unsecure side and compares it with the measured distance, making an access decision based on this preliminary location assessment, thereby preventing unauthorized access before it can occur
Solution Approach 2:
The patent implements a feedback mechanism where the UWB subsystem continuously provides distance and signal quality information to the access control device. The system uses multiple UWB antennas to measure signal-to-noise ratios and compares these measurements against expected values for different door sides, adjusting the access decision based on this feedback loop
3Ease of operation
If the access control device requires active physical action from the user, then credential verification is straightforward, but the system lacks the ability to infer user intent and automatically control access
Solution Approach 1:
The patent enables the system to automatically determine user intent and make access decisions without requiring the user to actively present credentials or interact with the device. The UWB subsystem passively measures distance and signal characteristics, and the access control device autonomously interprets these measurements to infer whether the user intends to enter, granting access automatically when conditions are met
Solution Approach 2:
The patent monitors changes in UWB measurement parameters (distance, signal-to-noise ratio) over time to infer user intent. By tracking how these parameters change as the user moves, the system can determine whether the user is approaching the door with intent to enter, enabling automatic access control based on dynamic parameter analysis
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 security by ensuring the door remains locked when approached from the secure side and allows seamless access when intended, reducing the risk of unauthorized entry.
Implementation Method 1
receiving, from an ultra wideband (UWB) subsystem of an access control device, UWB data indicative of a distance of a mobile device relative to the access control device
Implementation Method 2
a signal-to-noise ratio (SNR) of signals received by a plurality of UWB antennas of the UWB subsystem
Data Source
AI summary
A method according to an embodiment includes receiving UWB data indicative of a distance of a mobile device relative to the access control device and a SNR of signals received by a plurality of UWB antennas, inferring a side of the passageway at which the mobile device is located based on the distance of the mobile device relative to the access control device and also based on the SNR of the signals, estimating a travel time of the mobile device to the passageway based on the UWB data if the inferred side of the passageway based on the distance of the mobile device is different from the side of the passageway inferred based on the SNR of the signals, and determining the side of the passageway at which the mobile device is located to be an unsecure side of the passageway if the travel time exceeds a predefined threshold time.