On 4/1/2015 2:31 PM, Paul wrote:
On Wed, Apr 1, 2015 at 12:33 PM, Reid Oda <reid....@gmail.com> wrote:
This seems to imply that the iPhone does get sub-second timing info from
GPS. Can anyone confirm/deny this?
As of iOS N where I believe N == 5 it does the equivalent of calling
ntpdate every few hours if the network is available. I assume it uses the
mobile system if the network is unavailable and you have a cellular radio
because the devices (can) have a lot of drift.
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The phone has to keep synch within a few microseconds of the network.
There was a time when operators were very sloppy about clock time and
really only worried about network frequency, but most operators are now
maintaining 50 ns or so at the base stations and have to maintain within
5 microseconds to meet the LTE specs. How much of this is preserved
through to the user interface is anyone's guess.
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