20 Aug
2025
20 Aug
'25
7:02 p.m.
pespin has uploaded this change for review. (
https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/40894?usp=email )
Change subject: 5gc: Add helper to get incremental PTI field
......................................................................
5gc: Add helper to get incremental PTI field
Change-Id: I9d32024b58799bbd3ef547cdc73ee73d7f7275d2
---
M 5gc/C5G_Tests.ttcn
M 5gc/ConnHdlr.ttcn
2 files changed, 18 insertions(+), 2 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/94/40894/1
diff --git a/5gc/C5G_Tests.ttcn b/5gc/C5G_Tests.ttcn
index f9a9057..ae8260c 100644
--- a/5gc/C5G_Tests.ttcn
+++ b/5gc/C5G_Tests.ttcn
@@ -103,6 +103,7 @@
ran_id := idx,
amf_id := omit,
guti := omit,
+ pti := '00'O,
sess_pars := ts_PDUSessionParams(id := 1,
run_prog_pars := ts_RunProgParams(idx),
ran_gtpu_teid := int2oct(idx + 1, 4))
diff --git a/5gc/ConnHdlr.ttcn b/5gc/ConnHdlr.ttcn
index ccee880..ebac2ae 100644
--- a/5gc/ConnHdlr.ttcn
+++ b/5gc/ConnHdlr.ttcn
@@ -87,6 +87,7 @@
RAN_UE_NGAP_ID ran_id,
AMF_UE_NGAP_ID amf_id optional,
octetstring guti optional,
+ ProcedureTransactionIdentifier pti,
PDUSessionParams sess_pars
};
@@ -168,6 +169,19 @@
}
}
+/* 3GPP TS 24.501 9.6, 3GPP TS 24.007 11.2.3.1a.
+ * 0 = "No procedure transaction identity assigned", 255 =
"Reserved". */
+private function f_next_pti() runs on ConnHdlr return ProcedureTransactionIdentifier
+{
+ var integer i := oct2int(g_pars.ue_pars.pti);
+ if (i >= 254) {
+ g_pars.ue_pars.pti := '01'O;
+ } else {
+ g_pars.ue_pars.pti := int2oct(i + 1, 1);
+ }
+ return g_pars.ue_pars.pti;
+}
+
/* 3GPP TS 24.501 5.4.1.3.2, 3GPP TS 33.501 6.1.3.2 */
private altstep as_ngap_handle_auth(boolean allow_resync := true) runs on ConnHdlr {
var NG_NAS_DL_Message_Type rx_nas;
@@ -342,9 +356,10 @@
var template (value) NG_NAS_UL_Message_Type nas_ul_msg;
var NAS_PDU nas_pdu;
var NG_NAS_DL_Message_Type rx_nas, inner_nas;
+ var ProcedureTransactionIdentifier pti := f_next_pti();
var OCT1 pdu_sess_id := int2oct(g_pars.ue_pars.sess_pars.id, 1);
- nas_ul_msg := cs_NG_PDU_SESSION_ESTABLISHMENT_REQUEST(cs_NG_PDU_SessionIdV(pdu_sess_id),
'01'O,
+ nas_ul_msg := cs_NG_PDU_SESSION_ESTABLISHMENT_REQUEST(cs_NG_PDU_SessionIdV(pdu_sess_id),
pti,
p_IntegrityProtMaxDataRate := cs_IntegrityProtMaxDataRateV('FF'O,
'FF'O),
p_PDU_SessionType := cs_PDU_SessionTypeTV('001'B), /* IPv4 */
p_SSC_Mode := cs_SSC_ModeTV('001'B));
@@ -559,7 +574,7 @@
var template (value) NG_NAS_UL_Message_Type nas_ul_msg;
var NAS_PDU nas_pdu;
var NG_NAS_DL_Message_Type rx_nas, inner_nas;
- var ProcedureTransactionIdentifier pti := '02'O;
+ var ProcedureTransactionIdentifier pti := f_next_pti();
var NAS_CauseValue_Type cause_val := c_5GSM_Cause_RegularDeactivation;
var OCT1 pdu_sess_id := int2oct(g_pars.ue_pars.sess_pars.id, 1);
--
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Gerrit-MessageType: newchange
Gerrit-Project: osmo-ttcn3-hacks
Gerrit-Branch: master
Gerrit-Change-Id: I9d32024b58799bbd3ef547cdc73ee73d7f7275d2
Gerrit-Change-Number: 40894
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <pespin(a)sysmocom.de>