There have been several comments that A-GPS does not work in the Telecom XT network.  Nokia Assisted GPS is working fine for me, and is very worthwhile for speeding up time to get a location with the integrated GPS receiver in my Nokia E71. In a new location I get a GPS fix in 15-50 seconds, instead of several minutes without Assisted GPS.  
 

I am referring to "Assisted GPS" in the Nokia E71 menu Tools ... Settings...General...Positioning...Positioning Methods.



The reason that Nokia Assisted GPS works in the Telecom XT network is that Nokia Assisted GPS does not require the network operator to implement any special location technology.  It works by using a packet data connection to send Mobile Country Code, Mobile Network Code and Cell ID to Nokia's SUPL server, to obtain current satellite frequencies serving your country (and maybe network, although XT is nation-wide).  This helps the integrated GPS receiver to listen to the most appropriate satellite frequencies and not waste time listening to the others.  If you can't get adequate GPS satellite signals, e.g. indoors and in canyons of buildings, asssisted GPS won't help immediately but its information will be cached by the phone and will be used when you move outdoors or to a window, at which time a GPS location fix will be obtained rapidly.

 

The source of the confusion may be that the term A-GPS is used loosely in the industry, to refer to a variety of mechanisms for assisting a device to obtain a location.

The mechanism that is not implemented (yet?) in Telecom XT network is what Nokia calls the "Network based" positioning method (in the same menu as above).  This mechanism requires positioning technology within the cellular network.  To obtain a location it requires the phone to obtain cellular signal from several cells. The location is very approximate.  The advantage of this method is that it works in places where you can't get adequate GPS satellite signals, e.g. indoors and in canyons of buildings.




My Assisted GPS settings that work are:

Main Menu...Tools ... Settings...General...Positioning...Positioning Methods








  • (ticked) Assisted GPS





  • (ticked) Integrated GPS





  • (unticked) Network based    (No functional effect.  Maybe tick it in future to see if Telecom XT has implemented this in its network)








Main Menu...Tools ... Settings...General...Positioning...Positioning Server








  • Access Point = TelecomContent.  (Must be packet data. WLAN access points are not supported by Nokia's SUPL protocol)





  • Server address = supl.nokia.com     (was already configured in the phone)








Maps application ...Options...Tools...Settings...Internet








  • Go online at start-up = No  (No = avoid data usage - this access point is used for online searching, synchronising landmarks with ovi, and obtaining new maps - see below).  You still have the option to Go Online while using Maps, e.g. to do an Online Search (which is wider area than an Offline Search).  This setting is not relevant to Assisted GPS, which uses the access point mentioned above.





  • Default access point = TelecomContent    (alternatively TelecomDefault works too)








I am using Nokia Maps 2.0.  Phone's firmware version is 110.07.127, which is old but Nokia SoftwareUpdater tells me it is the most recent for the particular model of RM-407 that Telecom supplied me this week.



When I start the Nokia Maps application it triggers Assisted GPS which uses 3-10kBytes of packet data over the connection.  This costs a fraction of a cent if you have a data plan (but contributes to minimum $1/day charge if you don't have a data plan, i.e. Casual).  

 

Aside from automatic download of new maps over the 3G network via the second access point, there are 2 alternative ways to get the maps into your phone:






  1. Set the "Default access point" (Maps application ...Options...Tools...Settings...Internet) to your home broadband wireless LAN.  Let the device obtain the maps then set the default access point back to TelecomContent so you have the option to go online when using Maps when you are out and about.





  2. Load the maps into the phone using Nokia Maploader





hope this helps...


Edited 20 Aug 2009

Edited 21 Aug 2009