Wireless Link Termination via Motion Sensor Feedback
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Solution Overview
Problem
Portable wireless communication devices, such as cellular telephones, face issues when used with remote user interface devices as they often remain connected even after the user has exited the vehicle, leading to unnecessary power consumption and diversion of cellular communications.
Innovation Solution
Incorporating motion sensors in both the portable communication device and the remote user interface device to automatically terminate the wireless communication link and enter a power-conserving mode when the user exits the vehicle, using accelerometers to detect motion and determine when to disconnect the link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the remote user interface device remains connected to the portable communication device after the user exits the vehicle, then the wireless communication link maintains availability for incoming calls, but unnecessary power is consumed and cellular communications may be diverted
Solution Approach 1:
The system performs preliminary detection of user presence/absence conditions before automatically disconnecting the wireless communication link. Motion sensors detect when the portable device is removed from the vehicle, and the system verifies this condition before terminating the connection, ensuring appropriate timing for disconnection to occur only when the user has truly exited the vehicle.
Solution Approach 2:
The system continuously monitors motion sensor feedback from both devices to determine the appropriate time for disconnection. The portable communication device and remote user interface device exchange motion status information, creating a feedback loop that enables intelligent decision-making about when to terminate the wireless link based on real-time detection of user absence.
2Measurement precision
If motion sensors continuously monitor device movement to detect user exit, then accurate determination of disconnect timing is achieved, but device complexity increases
Solution Approach 1:
The motion detection function is segmented between two separate devices: the portable communication device contains its own motion sensor, and the remote user interface device contains its own motion sensor. Each device independently monitors its own movement status and communicates this information to the other, dividing the monitoring task rather than requiring a single complex centralized system.
Solution Approach 2:
The wireless communication link serves as an intermediary that carries motion status information between the two devices. Rather than requiring direct physical connection or complex wired sensing systems, the devices use the existing wireless communication infrastructure to exchange motion detection data, simplifying the overall system architecture while maintaining accurate detection capabilities.
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 solution effectively conserves power and prevents unintended diversion of cellular communications by accurately determining when the user has left the vehicle, ensuring efficient operation and user convenience.
Implementation Method 1
The portable communication device and the remote user interface device each include a motion sensor, which will be described as an accelerometer
Data Source
AI summary
A portable communication device, such as a cellular telephone, communicates via a wireless communication link with a remote user interface device, such as a hands-free interface. The portable communication device and the remote user interface device each comprises a motion sensor, by which each device can determine motion of the device with respect to the earth. The devices may share, via the wireless communication link, motion messages. The wireless communication link may be terminated as a function of the motion of the devices. After the wireless communication link is terminated, the remote user interface device may automatically enter a low-power mode.