Femtocell Selective Jamming for Unauthorized Wireless Access Control

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Solution Overview

Problem

Existing solutions for controlling unauthorized wireless communication in restricted areas, such as radio jamming, are inefficient due to lack of spectral selectivity, inability to trace or locate unauthorized devices, and high implementation costs, leading to inadequate protection against illicit activities.

Innovation Solution

The use of networked femtocell access points and distributed antenna systems for selective radio jamming, allowing for dynamic control of wireless resources and monitoring of wireless activity, enabling the location of unauthorized devices within restricted areas.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If radio jamming is used to block unauthorized wireless communication, then wireless access control is achieved, but spectral selectivity is lost and emergency calls are also blocked

Engineering Contradiction:

Improvewireless access controlVSAvoidblocking of emergency calls

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system applies different treatment to different frequency bands by identifying and selectively blocking only the frequencies used by unauthorized devices, while allowing emergency call frequencies to pass through unaffected. This localized approach to spectral blocking resolves the contradiction between achieving access control and maintaining emergency communication capability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically changes the blocking parameters based on the identified unauthorized device's transmission characteristics. By monitoring and adapting the blocking frequencies to match only the problematic device's emissions, the system achieves selective control without affecting emergency services operating on different frequencies.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If radio jamming is used to prevent unauthorized communication, then wireless resource control is achieved, but the ability to trace or locate unauthorized devices is lost

Engineering Contradiction:

Improvewireless resource controlVSAvoidinability to trace unauthorized devices

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The system performs preliminary identification and location of unauthorized devices before implementing blocking. By first detecting and tracking the unauthorized device's position and transmission patterns, the system maintains the ability to trace devices while subsequently applying targeted spectral blocking to control wireless resources.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors wireless transmissions and provides feedback on unauthorized device locations and activities. This feedback mechanism enables both tracking of unauthorized devices and dynamic adjustment of blocking strategies, resolving the contradiction between resource control and traceability.

Inventive Principle:

Principle #23Feedback

3Reliability

If conventional radio jamming equipment is deployed to block wireless communication, then unauthorized access is prevented, but implementation costs and power consumption increase substantially

Engineering Contradiction:

Improveunauthorized access preventionVSAvoidpower consumption of jamming equipment

Core Design Contradiction:

ReliabilityVSUse of energy by stationary object

Solution Approach 1:

The system extracts only the essential function of blocking unauthorized frequencies while eliminating the need for expensive, high-power conventional jamming equipment. By using software-based spectral analysis and selective filtering, the system achieves unauthorized access prevention with minimal power consumption and reduced implementation costs.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system replaces expensive, power-intensive conventional jamming equipment with cost-effective software-based filtering mechanisms. This substitution dramatically reduces both implementation costs and ongoing power consumption while maintaining effective unauthorized access prevention.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS9088386B2Regulation of service in restricted telecommunication service area

Publication Date: 2015.07.21 AT&T MOBILITY II LLC

AI summary

Telecommunication service is regulated in a confined area in which telecommunication is restricted. Regulation includes control of wireless resources and access thereto, and monitoring wireless activity and locating sources thereof within the confined area. Regulation can be accomplished through networked femtocell access points and distributed antenna systems. Control of wireless resources is accomplished through selective jamming within the confined area; selective jamming can be updated based on performance metrics of telecommunication service. Configurable lists that authorize mobile device(s) to consume wireless service within the confined area control access to wireless resources. Access can be granted, or denied statically or dynamically. Monitoring of wireless activity within the confined area includes tracking and recordation of signaling or traffic activity. The monitoring of signaling activity can enable location of a source of wireless activity, while monitoring of traffic can lead to identification of a user thereof.