Huawei ME909u-523 Application Manual page 68

HUAWEI ME909u-523 LTE LGA Module
Application Guide
Positioning Description
methods
XTRA Downloads XTRA data
positioning from the Qualcomm's
XTRA server to assist
positioning. The XTRA
data is valid for 7 days.
Cell ID
Base station mode, this
approach will be based
on the cell ID number of
the mobile terminal is
located to determine the
location of the user
Global Uses both the GPS and
navigation GLONASS for positioning.
satellite system
(abbreviated as
GNSS)
Issue 04 (2014-12-08)
Benefits
 Reduces the TTFF after cold
start.
 Long valid period for the
XTRA data, eliminating
frequent data downloading.
This mode can be use when
other optioning methods are
failed.
.
Using more satellites,
increases the successful
positioning rate and the
positioning accuracy.
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GPS Application Scenarios
Drawbacks
 Cannot reduce
the TTFF after
cold start as
significantly as
the A-GPS
methods.
The XTRA data's

ability to assist
positioning
declines as time
goes by.
Very low accuracy.
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