ubuntu-phone team mailing list archive

[Thomas Voß <thomas.voss@xxxxxxxxxxxxx>]

On Mon, Feb 29, 2016 at 10:32 PM, Alan Bell <alanbell@xxxxxxxxxx> wrote:
> I don't think that is quite the problem, GPS has got every chance to work,
> the problem is the starting time, I don't want it to start thinking about a
> location when I do something that needs one. I want it to already have
> sorted it out before I ask for it. The principal should be "don't make the
> human wait for stuff". There has to be some kind of event that starts it to
> get a fix prior to me doing something that requires a location, that could
> be a regular wakeup every x minutes, it could be that it starts looking when
> the phone gets woken up, or if the browser is started, or if the
> accelerometer indicates that the phone has stopped moving for a while, or
> something else. Whatever it is, I want it to have done it before I press the
> shutter on the camera, or open a web page with location services.
>

I think the key aspect is ttff here, but again: Patches are very
welcome and I would be happy
to work together with you and see if we can come up with a heuristic
that applies to a majority of the
userbase.

  Thomas

> Alan.
>
>
>
>
> On 29/02/16 21:12, Felipe De La Puente wrote:
>
> I think that the weak link here is the GNSS assistance mechanism used in
> ubuntu.
>
> Having a good assistance method the time to first fix should be within
> seconds or worst case a couple of minutes. Am I right?
>
> If the system is able to achieve <1min time to first fix, then you don't
> need to give the last known position to the client apps anymore.
>
> Now, let's say you are inside a building, then you need an alternative
> method to determine your location, like using visible cell towers or
> hotspots.
>
> Best Regards,
> Felipe.
>
>
> On Mon, Feb 29, 2016 at 5:46 PM, Alan Pope <alan.pope@xxxxxxxxxxxxx> wrote:
>>
>> Hi Thomas,
>>
>> On 29 February 2016 at 15:35, Thomas Voß <thomas.voss@xxxxxxxxxxxxx>
>> wrote:
>> > On Mon, Feb 29, 2016 at 12:38 PM, Alan Bell <alanbell@xxxxxxxxxx> wrote:
>> >> it isn't really about that, it is about providing less broken location
>> >> data
>> >> to applications that ask for it. The current situation is that if an
>> >> application requests location data it gets given random coordinates of
>> >> somewhere you may have been to in the last week or so.
>> >
>> > Hmmm, I'm surprised by that statement. The service hands out the last
>> > known good location, together with a timestamp
>> > and the accuracy aged out. If applications fail to handle the
>> > respective data correctly, it is not the service at fault here.
>> >
>>
>> I spent a week in Germany last week. At lunch time we wandered outside
>> from the exhibition centre and opened HERE maps to find a nearby kebab
>> shop (don't ask). Ogra pulled out his MX4 running rc-proposed and used
>> HERE to find a local shop and navigate to it. Our destination seemed a
>> ludicrous distance away from our current location, until we noticed
>> the current location on the map was actually the hotel we left some 5
>> hours previously. Cue a few moments of stabbing to refresh the app to
>> make it realise we've moved (quite a bit as it happened).
>>
>> While this may be "Working As Designed", it's not "Working in a
>> meaningfully useful way". Having a location which is "aged" by over
>> half a working day is pretty useless on a mobile device. Other
>> platforms don't do this (in my experience), neither should we, battery
>> life be dammed, frankly. I want the map to show me where I am now, not
>> where I ate breakfast sometime in the past.
>>
>> >> Then it thinks about
>> >> refreshing the location and refining it over the next few minutes or so
>> >> if
>> >> the application is one that asks where you are again and again. If it
>> >> could
>> >> take a peek at the satellites every so often then it would enable
>> >> several
>> >> additional classes of application and would be less broken for things
>> >> that
>> >> only ask once.
>> >>
>> >
>> > That's incorrect. The service keeps on delivering updates to
>> > applications that have requested continuous location updates.
>>
>> Then there is a bug in the platform. The browser (in which HERE runs)
>> is a default app and the location service is also pre-installed. There
>> is an issue here which clearly need nailing as I'm certain we're not
>> the only 3 people in the world to experience this.
>>
>> Cheers,
>> --
>> Alan Pope
>> Community Manager
>>
>> Canonical - Ubuntu Engineering and Services
>> +44 (0) 7973 620 164
>> alan.pope@xxxxxxxxxxxxx
>> http://ubuntu.com/
>>
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