Method and system for identifying an illegal terminal in a cellular radio system
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United States of America Patent
Stats
-
Apr 23, 2002
Grant Date -
Dec 20, 2001
app pub date -
Oct 6, 1998
filing date -
Oct 8, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A cellular radio system comprises terminals (401, 402) arranged to transmit a specific message of a predetermined form at least two times (408, 409; 413, 414), so that there is a predetermined time-out between the two successive messages of said form. A message of said form, which is received from a terminal, is attached (503, 507, 509) to a code representing the terminal in order to identify an illegal terminal. Such a terminal is regarded as identified (513, 514) for which the time between the reception of the two successive messages of said form attached to the code representing the terminal is shorter than said time-out.
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