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hnbgw: f_iuh2iu_disconnect: allow more time 

Increase timeout for expecting an SCCP RLSD from osmo-hnbgw.

Affects tests
HNBGW_Tests.TC_ranap_cs_mo_disconnect
HNBGW_Tests.TC_ranap_ps_mo_disconnect

Rationale:

For the case

 RUA --id-Disconnect--> HNBGW  ----release-SCCP---- CN

the tests expect behavior not exactly specified.
3GPP TS 48.006 9.2 Connection release:

 The MSC sends a SCCP released message. This message shall not contain
 any user data field.

So what we should expect is this:

                           HNBGW                    MSC
 RUA --id-Disconnect-------> | ---Data-Form-1(!)---> |  Iu-ReleaseComplete
                             | <--Released---------- |  (no data)

Instead, we expect the HNBGW to immediately send a RLSD to the MSC:

                           HNBGW                    MSC
 RUA --id-Disconnect-------> | ---Released---------> |  Iu-ReleaseComplete

osmo-hnbgw is being fixed in that respect: it will soon give time for
the CN to send an SCCP RLSD, and only if that times out will osmo-hnbgw
send an SCCP RLSD to the CN.

So HNBGW_Tests.ttcn should still ensure that osmo-hnbgw will eventually
send an SCCP RLSD if the CN fails to do so, but it should allow more
time to accomodate the release timeout.

Related: osmo-hnbgw I6ff7e36532ff57c6f2d3e7e419dd22ef27dafd19
Related: SYS#6297
Change-Id: Ibf6eaeb1b82d43e4f208f64a71f2f6e889883a11
This commit is contained in:
Neels Hofmeyr 2023-02-20 14:26:31 +01:00 committed by laforge
parent dd0027540c
commit 99b7d40e7b
1 changed files with 15 additions and 1 deletions
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16
hnbgw/HNBGW_Tests.ttcn
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@ -561,11 +561,25 @@ runs on ConnHdlr return RANAP_PDU {
return rx;
}
/* 3GPP TS 48.006 9.2 Connection release:
*
* The MSC sends a SCCP released message. This message shall not contain
* any user data field.
*
* So what we expect normally is:
*
* HNBGW MSC
* RUA --id-Disconnect-------> | ---Data-Form-1(!)---> | Iu-ReleaseComplete
* | <--Released---------- | (no data)
*
* This function tests osmo-hnbgw behavior if the CN fails to send a RLSD:
* after some timeout, osmo-hnbgw should send a RLSD to the CN.
*/
function f_iuh2iu_disconnect(template (present) RANAP_PDU tx, RUA_IEs.Cause cause,
template RANAP_PDU exp_rx := omit)
runs on ConnHdlr return RANAP_PDU {
var RANAP_PDU rx
timer T := 5.0;
timer T := 10.0;
if (istemplatekind(exp_rx, "omit")) {
exp_rx := tx;