초록 ▼

A method and device for achieving reliable prevention of cellular telephone calls, within a given area. In the preferred embodiment, the device and method operate to block the control frequencies of the cellular system within a given area. The device broadcasts a blocking signal with a low power out

A method and device for achieving reliable prevention of cellular telephone calls, within a given area. In the preferred embodiment, the device and method operate to block the control frequencies of the cellular system within a given area. The device broadcasts a blocking signal with a low power output, which interferes with the reception ability and decoding of signals and commands broadcast at the control frequency. Thus, the handshake routine of the telephone/cellular subscriber with the local cellular system is prevented. Operation of the device is achieved in several ways, manually, automatically, and/or by remote control. Its operation prevents cellular communication ability by subscribers within the area or within the effective blocking range, which is derived from the effective radiated power (ERP) of the blocking signal, its type and the type of communications/or blocked system. Using the inventive device, a given area normally accessible by cellular communications is blocked from such access, thus providing a security-related, cultural or other safeguard. The given area is thereby isolated from cellular communications, and access can only be achieved by physically relocating the user of a blocked cellular telephone.

대표청구항 ▼

1. A method for prevention of cellular telephone calls in a cellular communication system within a given area, said method comprising:determining a plurality of control frequency existing within the area for establishing cellular telephone calls, said at least one control frequency containing inform

1. A method for prevention of cellular telephone calls in a cellular communication system within a given area, said method comprising:determining a plurality of control frequency existing within the area for establishing cellular telephone calls, said at least one control frequency containing information thereon, said information being transmitted as coded signals and commands; and generating an interference signal which interferes with said at least one control frequency by preventing decoding of said signals and commands, said interference signal preventing generation of handshake signals in the system, to prevent establishment of a cellular phone call with a portable cellular telephone, wherein said interference signal is generated continuously on said at least one control frequency; and wherein generating comprises mixing said determined control frequency with a predetermined frequency to develop a phase modulated signal, wherein the interference signal blocks decoding of a forward control channel signal by introducing phase noise in said portable cellular telephone.