Hello, 2016-01-03 21:21 GMT+01:00 Thomas Voß <[email protected]>:
> Hey there, > > thanks for your feedback. Let me try to provide some detail regarding your > questions: > > (1.) Whether you are using a mid-to-high-end or a budget phone does hardly > have any impact on the positioning performance in general. GPS just is > quite slow. > So why in example LG L Fino can find proper location in 1-5 seconds? It is possible to see how they do that and implement the same / similar solution in our Ubuntu phones? > (2.) Assisted GPS, relying on network-based positioning taking into > account wifi hotspots and cell towers is enabled for all production images. > (3.) 30 seconds - 2 minutes for a position estimate with GPS accuracy is > pretty good, actually. Some more details on the timing here: > * ~15 seconds are required to obtain an initial position estimate based > on visible wifi networks and cell towers. The accuracy for this estimate is > typically around ~100m, but > can be as low as ~30m (in typical cases). > * This initial position estimate is fed into the GPS chipset which is > already active, and it takes ~20 seconds - multiple minutes for the chipset > to come back with a > a position estimate. > > That being said, we are working on improving the overall user experience > by caching the last known position estimates and handing those out right > after an > application has requested location services to become active. The > algorithm requires some careful tuning, as with every other caching > approach, though. > > Please note that it is very unlikely that we will provide an option to > keep the gps chipset on all the time. Battery life would be a disaster, as > the GPS chipset > is draining a *lot* of power. We would be talking a few hours for the > battery to discharge, if we kept the chipset active. > > Feel free to file a bug against location services if you think that there > is any specific optimization for minimizing time-to-first-fix that we are > missing: > > https://bugs.launchpad.net/ubuntu/+source/location-service > > HTH, > > Thomas > > > > On Sun, Jan 3, 2016 at 12:48 PM, Krzysztof Tataradziński < > [email protected]> wrote: > >> Hello, >> >> >> We all know that on MX4 getting GPS fix takes really long time (30 sec - >> 2 min), making scopes like NearBy useless in most of cases. I have a look >> at budget LG L Fino with Android and compared it to MX4. >> In both phones test was the same: at start mobile data and WiFi turned >> off. Next step - turning mobile data on, opening GPS app (Google Maps and >> uNav) and waiting for proper location. >> MX4 time - as mentioned above. LG L Fino - I didn't notice when it find >> location - it was that fast (simply when Maps finished opening, I saw >> correct location). Could anyone explain why budget phone can find location >> in 1-2 sec and mid-to-high-end MX4 can't? Is there hardware problem or >> software? Maybe in LG L Fino, system is asking for location all the time >> keeping GPS fix all the time it can? Is there anything we can do with >> data, even at the cost of battery usage? (for now, I can use MX4 even 4-5 >> days without charging - but I would prefer to charge it even 1,5 days if >> that could improve location services) >> >> Best regards, >> Krzysztof Tataradziński >> https://launchpad.net/~ktatar156 >> >> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> >> Ten >> e-mail został wysłany z komputera wolnego od wirusów chronionego przez >> Avast. >> www.avast.com >> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> >> <#15209268ba70d4b1_1520751ab53dee75_DDB4FAA8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >> >> -- >> Mailing list: https://launchpad.net/~ubuntu-phone >> Post to : [email protected] >> Unsubscribe : https://launchpad.net/~ubuntu-phone >> More help : https://help.launchpad.net/ListHelp >> >> >
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