On Thu, 2007-01-25 at 16:24 +0100, Harald Welte wrote: > > 3. A-GPS involves additional data traffic and thus (potential) additional > > costs. Does it use a normal GSM/GPRS IP-based data transfer? does it use > > some out-of-band GSM/GPRS control messages? or does it get data from > > broadcasts in the local cell (e.g. GSM cell-broadcast)? > > AFAIK: GPRS. so its up to you whether you want that extra traffic (and > cost, unless you're flat) or not.
The Global Locate docs state TCP/IP as one possible way. So via USB-network or BT should be possible too. Source (gpsd aka Global Locate Library): http://www.globallocate.com/SEMICONDUCTORS/SEMI_DRIVER_Frameset.htm > > 4. if the answer to above is GPRS: is it possible to estimate in advance how > > much additional traffic (in Kbytes/day of full operation)? > > I am sure it's a quite fixed amount of You need it only once for the first fix. It is ~2KB for all satellites and valid for 2-4 hours. Precomputed for a week maybe 1MB. Marcus _______________________________________________ OpenMoko community mailing list [email protected] https://lists.openmoko.org/mailman/listinfo/community
