HUAWEI ME909u-523 LTE LGA Module
Application Guide
GPS Application Scenarios
Issue 04 (2014-12-08)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
68
Positioning
methods
Description
Benefits
Drawbacks
XTRA
positioning
Downloads XTRA data
from the Qualcomm's
XTRA server to assist
positioning. The XTRA
data is valid for 7 days.
Reduces the TTFF after cold
start.
Long valid period for the
XTRA data, eliminating
frequent data downloading.
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.
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
.
This mode can be use when
other optioning methods are
failed.
Very low accuracy.
Global
navigation
satellite system
(abbreviated as
GNSS)
Uses both the GPS and
GLONASS for positioning.
Using more satellites,
increases the successful
positioning rate and the
positioning accuracy.