Good Evening,

this is a bit of speculation but Keith showed me a trace with some network delay that makes a case for using FSM for the lchan itself.

It seems the following can happen:

* LU REJECT * Start Channel Release ** Send RR Release to the MS ** Deactivate SACCH ** Start Timer

... network transmission issues... at least 5s

* SACCH deactivate timeout ** Start error release procedure..

...

* LATE RELEASE INDICATION arrives triggering other release procedure?

So with a proper FSM we would have transitioned into the error path and would just ignore the RELEASE INDICATION. The question is if someone has budget to do a FSM transition here? I will try to build a simulated testcase for that.

The other part that seems to happen (and I don't understand yet):

* Allocating a lchan before it is fully freed?! * The BTS sending us RF Channel Releasse ACK twice

cheers holger