ubuntu-phone team mailing list archive

[Krzysztof Tataradziński <ktatar156@xxxxxxxxx>]

Hello,

2016-01-03 21:21 GMT+01:00 Thomas Voß <thomas.voss@xxxxxxxxxxxxx>:

> 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 <
> ktatar156@xxxxxxxxx> 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
>>
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>