On Mon, Jan 4, 2016 at 12:43 PM, Krzysztof Tataradziński < [email protected]> wrote:
> 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? > Please refer to the second part of my answer, explaining in detail that we are taking a very similar approach to what android is doing. We are relying on a different network-based positioning service (namely, Here), though. One other thing: How do you know that you received a gps fix on the LG L Fino? Cheers, Thomas > > >> (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> >>> <#1520c731be467442_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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