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.
A wireless communications terminal stores owner information and function states. A terminal control device transmits, to the wireless communications terminal, control data including control target information for specifying a terminal to be controlled and function state change information indicating a change made in the function states of the terminal. The wireless communications terminal determines, based on the received control target information and the stored owner information, whether or not a function state(s) is to be changed, and changes the stored function states in accordance with the determination result. The wireless communications terminal transmits, to the terminal control device, a process end notification including the terminal's own identification information and indicating whether or not the function state(s) has been changed.
The test results found that the EMI impact depended on the UWB power that fell within the receiver passband. Specifically, EMI occurred when the average power in the receiver passband was approximately equal to the desired signal level of the receiver. One waveform, TW7, did not cause EMI because the average power was too low. Three waveforms, TW1, TW2, and TW6 only caused EMI when the receiver was tuned to the frequency of the UWB spectral component. Three waveforms, TW3, TW4, and TW5, caused EMI at all receiver frequencies. As noted, these tests were performed to determine the susceptibility of various RF receiver (radars and communications systems) devices to UWB signals. The tests were not intended to evaluate the use of UWB signals for jamming purposes.
A selective blocker for targeted mobile terminals. A signal monitor determines when a targeted mobile terminal is transmitting a signal to a base station. A signal analyzer identifies characteristics of the terminal signal and a processor produces a blocking response based on one or more characteristics. The blocking response is transmitted to the targeted mobile terminal to block communications between the targeted mobile terminal and the base station using the minimum power needed to effectively block the terminal signal so as to limit interference with non-targeted mobile terminals.
The disclosed invention makes mobile terminals physically impossible to use in specific spaces without using radio waves of so high intensity as to affect medical devices and without requiring telephone companies that operate wireless communications systems (WCS) to take special measures. Cooperation of a telephone company on the implementation of making mobile terminals physically impossible to use in specific spaces makes mobile terminals provided by the telephone company easy to use. Pseudo signals of downlink pilot signal in WCS are emitted off the pilot timing in specific spaces. Uplink channel radio waves in cooperative telephone compannies' WCS are relayed and communication path is disconnected if the uplink channel radio waves are for communication of an attribute banned in the space. Communication path can be disconnected without increasing the intensity of radio waves so high. In cooperative telephone compannies' WCS, only the path of communication of an attribute banned in the space is disconnected.
A system and method for interfacing equipment with flight Aircraft Equipment without causing interference between same. An isolation module includes transmission and power control functionality for ensuring safe and secure operation of the equipment on the aircraft.
