On Thu, Jan 25, 2007 at 02:38:20PM +0100, Michele Manzato wrote: > Some additional questions on this subject: > > 1. Is there any "A-GPS standard" whatsoever?
no. It's a broad term for many variants of GPS > 2. I have heard elsewhere (Wikipedia) that in A-GPS the computation effort > is shared between the device and the A-GPS Server. According to a previous > post, the device just downloads the ephemeris table so there isn't any > actual "computation sharing", but rather a download of a pre-computed table > download. Correct? As far as I understand it: yes. I will ask our GPS engineer to comment on those questions. > 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. > 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 > 5. Are there any known estimations on the overall (A)GPS performance on the > Neo (esp. fix time) There are some numbers in the data sheet of our GPS chipset vendor, but that data sheet is closed. I will ask them to give us some document/numbers that we can publicize. > 6. Coming to the Neo1973. In order to save costs, can the "Assisted" > function in A-GPS be disabled through software API? yes, it can be disabled through preferences. > 7. Is it possible to tell whether A-GPS is actually in use or not? yes. either you have enabled it in preferences or nor ;) > 8. Is it possible to tell/know which is the A-GPS server currently in use? yes. -- - Harald Welte <[EMAIL PROTECTED]> http://openmoko.org/ ============================================================================ Software for the worlds' first truly open Free Software mobile phone _______________________________________________ OpenMoko community mailing list [email protected] https://lists.openmoko.org/mailman/listinfo/community
