ubuntu-phone team mailing list archive

[Krzysztof Tataradziński <ktatar156@xxxxxxxxx>]

Hi

2016-01-04 16:39 GMT+01:00 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?
>

Like I said before
"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."
In details, while going to work at moring, I exit my building, turned
mobile data on (on both phones I've got GPS switch turned on all the time),
etc. On Google Maps there is a ring showing accuracy. When app started, I
saw circle with 2-4 meters radius right where I was.

>
> 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
>>>>
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>>>>
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>>>
>>
>