Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2009-04-29
2011-10-18
Liu, Harry (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C342S357520
Reexamination Certificate
active
08040277
ABSTRACT:
A method and a mobile device configured to obtain position information from a position broadcast system, the position broadcast system comprising a plurality of transmitters that each broadcast a respective signal containing position information for the respective transmitter. The method comprising: measuring signal strengths of signals from a plurality of the transmitters of the position broadcast system; and determining that the mobile device is out of range of the position broadcast system if the measured signals strengths satisfy at least one out of range criterion.
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Liu Harry
Research In Motion Limited
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