> > I can't say for sure, but I think the tricky part is that we have to > communicate to the modem for this. And that is not trivial. >
So much of this _is_ trivial. The almanac+ephmeris data is freely published. It is a few kb of data in a CSV file, so the data itself is trivial. A web service for this would be trivial. The problem is the GPS chipset vendors. They have no interface to put downloaded AGPS info on the GPS chip (well QC does, they have a proprietary protocol for this). They are stuck in a mindset that mobile internet connections are not ubiquitous enough or reliable enough that they can be used to initialize the GPS with AGPS data. There _is_ still a need for SUPL to maximize AGPS coverage and reliability (if you are a surveyor, or need mission-critical geolocation, etc.), but for average consumer level mobile phone GPS use, network AGPS would perform excellently. And it would work better than SUPL in cases where people travel, since the SUPL servers can be location-specific (depending on the commercial provider). Your phone with SUPL for one location may not have a contract with a SUPL provider in another location. _______________________________________________ dev-b2g mailing list [email protected] https://lists.mozilla.org/listinfo/dev-b2g
