Method and apparatus for determining whether a mobile terminal has moved outside a given locale
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United States of America Patent
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Jun 25, 2013
Grant Date -
Apr 30, 2009
app pub date -
Jun 12, 2006
filing date -
Jun 27, 2005
priority date (Note) -
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Abstract
To determine whether a mobile terminal of a communications system has moved outside a locale, the terminal measures relative time offsets of signals received by the terminal from transmitters of the network, relative to each other or a reference. At a first time when the terminal is within a given locale, the time of receipt of signals received by the terminal from a plurality of the transmitters relative to a reference or each other are measured to create a first set of receive time offsets. At a second time, a second set of receive time offsets is measured. Change(s) in receive time offsets is/are calculated, and change(s) between the first and second times in transmission time offsets of the signals transmitted by at least one transmitter is/are obtained to determine movement indicators that are compared with threshold valuets to determine whether the mobile terminal has moved outside the locale.
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