Appeal No. 1998-2672
Application No. 07/955,768
failure, an alternate signal, such as a Long Range Navigation
(LORAN) signal, is used to provide redundant synchronization.
In order to achieve the degree of accuracy provided by the GPS
signal when using the alternate signal, the alternate signal
is characterized by utilizing the GPS signal during times when
the GPS signal is present.
Claim 1 is illustrative of the invention and reads as
follows:
1. An apparatus for providing synchronization for a
base-station in a communication system, the apparatus
comprising:
means for receiving a first clocking signal from
a source external to the base station, the first clocking
signal having a first frequency with a first stability
and utilized for synchronization when available;
means for providing a second clocking signal
having
a second frequency with a second stability, the second
stability being less than the first stability;
means for characterizing the second stability of
the second clocking signal utilizing said first clocking
signal to produce characterization information; and
means, coupled to said means for characterizing,
for employing said second clocking signal and said
characterization information for synchronization when
said first clocking signal is absent.
2
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