Signal Time Delay for Quiet Zone Communication Control
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Solution Overview
Problem
Existing methods to prevent mobile communications in specific areas, such as quiet zones, often interfere with legitimate signals and are illegal in some jurisdictions, making it difficult to manage communications effectively without disrupting navigation or other essential services.
Innovation Solution
Implementing a system that imposes a time delay on communications signals within designated quiet zones using optical fiber spools to create an artificial delay, allowing communications to be terminated or prevented without interfering with legitimate signals by dropping connections as devices enter these zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a jamming signal is used to prevent mobile communications in a quiet zone, then communications are blocked, but legitimate signals such as navigation signals are also interfered with
Solution Approach 1:
The system creates a localized quiet zone by introducing time delay only to signals originating from specific directions (outside the quiet zone), while leaving signals from other sources (legitimate communications, navigation) unaffected. This directional selectivity allows blocking unwanted communications without interfering with legitimate signals.
Solution Approach 2:
The system uses base stations as intermediary elements that receive signals and apply selective time delay processing. The base station acts as a mediator between the quiet zone requirements and the mobile devices, applying delay only to signals that should be blocked while allowing legitimate signals to pass through without interference.
2Object-affected harmful factors
If jamming is used to block all signals in an area, then mobile communications are prevented, but it becomes difficult to distinguish between desired and undesired signals when multiple carriers operate in the area
Solution Approach 1:
The system applies time delay to signals in advance before they reach mobile devices in the quiet zone. By pre-processing signals at the base station level and introducing artificial delay, the system prevents unwanted communications from being established rather than attempting to discriminate and block them after reception.
Solution Approach 2:
The system dynamically adjusts signal timing based on the location of mobile devices relative to quiet zones. When a device enters a quiet zone, the system applies time delay to incoming signals, creating a dynamic response that adapts to changing spatial conditions without requiring complex signal analysis.
3Object-affected harmful factors
If signal time delay is imposed on communications entering a quiet zone, then devices appear out of range and communications are terminated, but this requires precise timing control
Solution Approach 1:
The system changes the timing parameter of incoming signals by introducing a controlled time delay. This parameter modification causes mobile devices to perceive the signal as arriving outside the expected time window, making them appear out of range and automatically terminating communications without requiring complex precision control mechanisms.
Data Source
AI summary
Terminating or otherwise preventing communications in a predefined quiet zone by imposing a time delay. In one embodiment an existing call is terminated during a transition between two wireless access points by imposing a time delay on communications through one of the access points. The time delayed signal is interpreted as noise and causes a base station to drop the call if the noise causes the signal strength from the other access point to fall below a threshold. Within a quiet zone, a signal time delay prevents a client device from responding to a base station connection instruction, which causes the base station to believe that the client device is out of range of a quiet zone access point. The time delay may be imposed by an optical fiber spool between the quiet zone access point and the base station, or other delay mechanism. One embodiment is aboard a vessel.