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BSC_Tests: fix a race condition in TC_fh_params_handover_cmd 

As can be seen from ttcn3-bsc-test run #1565 on Jenkins [1], it may
happen that the VTY command requesting handover reaches the IUT earlier
than the SCCP 'SACK CC' message.  In this case, the 'SUBSCR_CONN' FSM
remains in state 'WAIT_CC', so we get an error:

  (bts=0,trx=0,ts=0,ss=0) (ARFCN 871) --> BTS 1 Manually triggering Handover from VTY
  SUBSCR_CONN(msc0-conn204)[0x5633b2877af0]{WAIT_CC}: Received Event HANDOVER_START
  SUBSCR_CONN(msc0-conn204)[0x5633b2877af0]{WAIT_CC}: Event HANDOVER_START not permitted

The easiest way to avoid this is to introduce and artificial delay
after the connection establishment and before triggering the handover.

[1] https://jenkins.osmocom.org/jenkins/view/TTCN3/job/ttcn3-bsc-test/1565/

Change-Id: I19f7ca942e22d7930a56d1a525414f137a9ef831
This commit is contained in:
Vadim Yanitskiy 2021-11-18 20:15:37 +03:00 committed by laforge
parent 2bcea3dec8
commit c18ff4734b
1 changed files with 1 additions and 0 deletions
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bsc/BSC_Tests.ttcn
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@ -8884,6 +8884,7 @@ runs on test_CT {
/* Establish a dedicated channel, so we can trigger handover */
dt := f_est_dchan(f_rnd_ra_cs(), 23, f_rnd_octstring(16));
f_sleep(0.5);
/* Trigger handover from BTS0 to BTS1 */
f_bts_0_cfg(BSCVTY, { "neighbor bts 1" });