Huawei MU609 Application Manual page 93

HUAWEI MU609 HSPA LGA Module
Application Guide
Positioning
methods
XTRA
positioning
Cell ID
Global
navigation
satellite
system
(abbreviated
as GNSS)
Issue 02 (2013-09-18)
Description
Downloads XTRA
data from the
Qualcomm's XTRA
server to assist
positioning. The
XTRA data is valid
for 7 days.
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
.
Uses both the GPS
and GLONASS for
positioning.
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GPS Application Scenarios
Benefits Drawbacks
 Reduces the 
TTFF after cold
start.
 Long valid
period for the

XTRA data,
eliminating
frequent data
downloading.
This mode can be Very low accuracy.
use when other
optioning
methods are
failed.
Using more
satellites,
increases the
successful
positioning rate
and the
positioning
accuracy.
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.
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