Portable Terminal Dual Communication UWB Shielding Alert
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Solution Overview
Problem
Smart key systems using ultra-wideband (UWB) wireless communication for vehicle authentication face challenges with high-frequency wave shielding by human bodies or metal objects, leading to unreliable communication and difficulty in accurately detecting the presence of portable terminal devices.
Innovation Solution
A portable terminal device equipped with dual communication units for UHF and UWB communication, along with a notification unit, controls wireless communication for authentication and distance measurement, alerting users when high-frequency waves are shielded, allowing for easier communication establishment and precise presence detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UWB communication using high-frequency waves is used for distance measurement, then measurement precision is improved, but reliability deteriorates due to shielding by human bodies or metal objects
Solution Approach 1:
The patent introduces a low-frequency communication unit as an intermediary channel to transmit distance measurement results and status information when high-frequency UWB communication is blocked. This intermediary low-frequency path ensures that authentication and information exchange can continue even when the primary high-frequency path is shielded, thus maintaining system reliability without compromising the precision of distance measurement.
2Measurement precision
If high-frequency waves are used for distance measurement, then measurement precision is improved, but ease of operation worsens due to communication unavailability
Solution Approach 1:
The low-frequency communication unit serves as a mediator that automatically takes over when high-frequency communication fails. The notification unit informs users of the shielding condition, and the system seamlessly switches to using the low-frequency path for transmitting distance measurement results, making the operation transparent and easy for users without requiring manual intervention.
Solution Approach 2:
The patent changes the frequency parameter of the communication waves based on the shielding condition. When high-frequency UWB waves are blocked, the system switches to low-frequency waves for communication, allowing distance measurement to continue with minimal user effort while adapting to the changed environmental conditions.
3Reliability
If dual communication units are added for both UHF and UWB, then reliability is improved, but device complexity increases
Solution Approach 1:
The notification unit is designed with multi-functionality, serving both to inform users of shielding conditions and to coordinate the switching between high-frequency and low-frequency communication paths. The controller integrates the management of both communication units, allowing a single component to handle multiple functions including authentication, distance measurement coordination, and communication path selection, thereby reducing overall system 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
Enhances security and service quality by accurately limiting the operational range of portable terminal devices, reducing unnecessary notifications and improving communication reliability through user alerts and precise distance measurement.
Implementation Method 1
a second communication unit configured to perform ultra-wideband wireless communication using a second frequency band including a frequency higher than a frequency of the first frequency band
Implementation Method 2
the notification unit may have a vibrator or a speaker, and the first controller may control the notification unit to perform the notification operation by generating vibration from the vibrator or generating sound from the speaker
Data Source
AI summary
A portable terminal device of an authentication system includes a first communication unit that performs wireless communication with a vehicle-mounted device by using a first frequency band, a second communication unit that performs ultra-wideband wireless communication using a second frequency band, a notification unit configured to perform a predetermined notification operation, and a first controller that controls the first communication unit, the second communication unit, and the notification unit. The first controller controls the first communication unit to perform wireless communication for authentication with the vehicle-mounted device, and controls the second communication unit to perform wireless communication for measuring a distance from the portable terminal device to the vehicle-mounted device. The first controller causes the notification unit to perform a predetermined notification operation when the first communication unit receives a radio signal indicating that distance measurement fails from the vehicle-mounted device.