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.
67
11
GPS Application Scenarios
11.1 Introduction to GPS
11.1.1
GPS Positioning Methods
Table 11-1
GPS positioning methods
Positioning
methods
Description
Benefits
Drawbacks
Standalone
This is a traditional GPS
positioning method. Using
this method, a module
receives satellite signals
directly and makes
calculations to obtain
positioning results.
No communication with the
network is invoked, incurring
no data traffic between the
module and the network.
Long time to first
fix (TTFF) in code
mode.
Mobile Station
Based (MSB)
positioning
using the User
Plane Protocol
Requests the assistant
data from the network to
assist and accelerate the
positioning. This method is
one of the Assisted GPS
(A-GPS) methods.
Significantly reduces the
TTFF after cold start and
increases the rate of
successful positioning.
Enables positioning in
environments with very poor
satellite signals.
Requires the
assistant data from
the network,
incurring network
traffic.
Mobile Station
Assisted (MSA)
using the User
Plane Protocol
Requests data from the
network to assist and
accelerate the positioning.
After receiving satellite
data, the module sends the
satellite data to the
network for calculations,
and the network returns
the calculation results to
the module. This method is
one of the A-GPS
methods.
Reduces the TTFF after cold
start and increases the rate
of successful positioning.
Hands most workload to the
network, reducing the
module's workload.
Enables positioning in
environments with poor
satellite signals (network
dependent).
Requires complex
interaction with the
network, incurring
network traffic.
