Type “B” Device: INTELLIGENT CELLULAR DISABLERS

Type “B” Device: INTELLIGENT CELLULAR DISABLERS

Unlike jammers, Type “B” devices do not transmit an interfering signal on the control channels. The device, when located in a designated ‘quiet' area, functions as a ‘detector'. It has a unique identification number for communicating with the cellular base station. When a Type “B” device detects the presence of a mobile phone in the quiet room; the ‘filtering' (i.e. the prevention of authorization of call establishment) is done by the software at the base station.
When the base station sends the signaling transmission to a target user, the device after detecting simultaneously the presence of that signal and the presence of the target user, signals the base station that the target user is in a ‘quiet' room; therefore, do not establish the communication. Messages can be routed to the user's voice- mail box, if the user subscribes to a voice-mail service. This process of detection and interruption of call establishment is done during the interval normally reserved for signaling and handshaking. For ‘emergency users', the intelligent detector device makes provisions for designated users who have emergency status. These users must pre-register their phone numbers with the service providers. When an incoming call arrives, the detector recognizes that number and the call are established for a specified maximum duration, say two minutes. The emergency users are also allowed to make out going calls. Similarly, the system is capable of recognizing and allowing all emergency calls routed to “911”.
It should be noted that the Type “B” detector device being an integral part of the cellular/PCS systems, would need to be provisioned by the cellular/PCS service providers or provisioned by a third-party working cooperatively with full support of the cellular/PCS service providers.