Wireless communications system for identifying unauthorized mobi

Details Wireless communications system for identifying unauthorized mobi Wireless communications system for identifying unauthorized mobi

1996-11-01

1999-09-14

Wolfe, Willis R.

Telecommunications

Radiotelephone system

Security or fraud prevention

455435, 455450, H04Q 738

Patent

active

059536543

ABSTRACT:
A system for identifying the presence of unauthorized mobile units in a communications system is disclosed. The system comprises at least one base station, at least two mobile units, at least one control channel, and at least one voice channel. The base station and a mobile unit first establish a connection on a control channel. Then they re-establish the connection on a voice channel. Subsequently, and while the communication continues on the voice channel, the base station sends a signal on the control channel to all other mobile units using the same identification as the first mobile unit. If any mobile units respond to the subsequent signal on the control channel, then the base station positively identifies the presence of an unauthorized mobile unit.

REFERENCES:
patent: 5293419 (1994-03-01), Hirano
patent: 5553314 (1996-09-01), Grube et al.
patent: 5557652 (1996-09-01), Jonsson
patent: 5557654 (1996-09-01), Maenpaa
patent: 5765107 (1998-06-01), Korowajczuk
patent: 5822691 (1998-10-01), Hosseini

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