Hi,<br /><br />&gt; ok, i see that there is also a &quot;one shot&quot; scheduler with full frame<br />&gt; number range. (sched_gsmtime.c) i think that i can use this to modify<br />&gt; the current channel set. i have code to test it.<br /><br />Yes, I&#39;m pretty sure that&#39;s the one I pointed you to. That&#39;s the one used for RACH scheduling as well.<br /><br />&gt; i don&#39;t know if the<br />&gt; callback function of the scheduled event is called before or after the<br />&gt; actual transmission/reception of the burst, which also sets the right<br />&gt; frequency. even if not, there will be only one frame lost.<br /><br />It&#39;s undefined I think. Because the one-shot scheduler will push it&#39;s event in the same pool as the other events once in range.<br /><br />But a priority associated with each task would be useful. Something like:<br /><br />-1 Before any burst<br />0...7 Timeslot (so that task can be scheduled in order of timeslot, would allow sdcch [4..7] )<br />8 After all bursts<br /><br />   Sylvain