Assisted Global Positioning System (A-GPS) assists your device in finding satellites. When using A-GPS, your device receives useful satellite information from an assistance data server over the cellular network. When your device is not receiving assisted data, it tries to detect the available satellites. With the assisted data your device can detect the set of satellites that are worth listening to, that is, the satellites that are on the same side of the planet with your device. A-GPS speeds up the location calculation remarkably. A-GPS is a network service. It is used by default in Nokia devices that support A-GPS, if no service provider specific A-GPS settings are available. A-GPS is available in all countries and does not depend on specific operator services.
What are the advantages and benefits of A-GPS?
A-GPS is designed to enable the device to establish the satellite fix more quickly and reliably than with standalone GPS. For example, positioning is obtained faster in cold-start situations, that is, when the GPS connection has been off for a long time, or if the user has travelled to a different country. With A-GPS, the approximate time to establish a GPS connection decreases significantly. As it may take minutes for a device using GPS to establish a GPS connection in a cold-start situation, A-GPS decreases the required time typically to tens of seconds.
In addition, A-GPS reduces the time the device requires to find its current position, known as ‘Time To First Fix’ (TTFF), for most geographical locations worldwide.
GPS has some restrictions which also apply to A-GPS. For example, the availability and quality of signals may be affected by buildings, natural obstacles, weather conditions, and the location of the user. If you are indoors, move to an open space outdoors. Ensure also that your hand does not cover the GPS receiver, which is located in the bottom of your device.
What kind of cellular network and data connection is used for A-GPS?
A-GPS uses 3G and 2G cellular network connection and GPRS AND EGPRS packet data connection. You must also have an internet access point defined in your compatible device. Wireless LAN (WLAN) access points are not currently supported when using A-GPS.
Where can I use A-GPS?
A-GPS is available worldwide, as long as you have access to the cellular network and a data connection. You can also use the service outside your home network (while roaming). A-GPS does not depend on specific operator services.
What does A-GPS cost?
Downloading assisted data involves the transmission of some amounts of data through your service provider’s network. Typically getting the GPS connection with A-GPS requires less than 10kB of data being transferred.
All data transmission costs are paid by the user. Outside your home cellular network, that is, while roaming, the costs may vary. Contact the service provider for information about data transmission costs.
How do I start using A-GPS with Maps on my mobile device with internal GPS receiver (e.g. Nokia N95)?
When you use Nokia Maps for the first time, you have to define an internet access point for downloading map information and using A-GPS. The device asks: ‘Access point is required for secure positioning. Define now?’ or ‘Assisted GPS and network based positioning requires a network connection. Enable network usage and define access point now?’. The question depends on your device. To define the access point that A-GPS will use, select ‘Yes’. If you select ‘No’, you can define the access point later: select Menu > Tools > Settings > General > Positioning > Positioning Methods > Assisted GPS.
Which settings do I need for using A-GPS on my mobile device with internal GPS receiver (e.g. Nokia N95)?
1. Define the address for the positioning server. The settings should be defined automatically when the device is switched on for the first time. To check the server address, select Menu > Tools > Settings > General > Positioning > Positioning Server.
The address of the A-GPS is supl.nokia.com.
If your network service provider has defined its own A-GPS specific settings for your device, these will override the A-GPS settings when you switch on the device for the first time.
2. Define the access point to be used to connect to the positioning server. To define the access point, select Menu > Tools > Settings > General > Positioning > Positioning Server.
3. Activate A-GPS. To activate A-GPS, select Menu > Tools > Settings > General > Positioning > Positioning Methods > Assisted GPS.
How can I disable A-GPS on my mobile device with internal GPS receiver (e.g. Nokia N95)?
You can disable A-GPS and use standalone GPS instead.
To disable A-GPS, select Menu > Tools > Settings > General > Positioning > Positioning Methods > Assisted GPS.
How can I get the A-GPS to my mobile device with internal GPS receiver (e.g. Nokia N95)?
To download the updated software that has the A-GPS settings built in, use the Nokia Software Updater. It is a free PC application, which allows you to update the device software on compatible Nokia devices.
The link to Nokia Software Updater is available in the most recent versions of Nokia PC Suite software or directly at http://www.nokia.com/softwareupdate
What happens to my navigation license after I have updated the new software to my mobile device with internal GPS receiver (e.g. Nokia N95)?
After a software update, you can manually update your navigation license:
1. Start the Nokia Maps application.
2. Select Options > Extras > My licenses.
3. Select Update.
4. To allow a connection to the license server to check the purchase & license options, select ‘Yes’ and then select the correct internet access point if necessary.
5.A note ‘xxx-day license activated’ is displayed, in which ‘xxx’ refers to the number of days that are left of your license. Alternatively, the device informs you that the license is updated.
This article from Nokia.Com