ubuntu-phone team mailing list archive

[Thomas Voß <thomas.voss@xxxxxxxxxxxxx>]

On Mon, Jan 4, 2016 at 12:43 PM, Krzysztof Tataradziński <
ktatar156@xxxxxxxxx> wrote:

> 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?
>


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 <
>> 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
>>>
>>> <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     : ubuntu-phone@xxxxxxxxxxxxxxxxxxx
>>> Unsubscribe : https://launchpad.net/~ubuntu-phone
>>> More help   : https://help.launchpad.net/ListHelp
>>>
>>>
>>
>