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osmo-ttcn3-hacks
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msc: MME emulation should send TAI during SGs LU for CSFB support 

3GPP TS 23.272 sec 4.3.3:
"During the SGs location update procedure, obtaining the last used LTE
PLMN ID via TAI in SGsAP-LOCATION-UPDATE-REQUEST as specified in TS
29.118".

Related: SYS#5337
Change-Id: I7057a7c41794d62f7cbc412da3e805c1f0c69511
This commit is contained in:
Pau Espin 2021-04-28 14:24:23 +02:00
parent 3acd19ea41
commit 3768a6fc34
2 changed files with 29 additions and 3 deletions
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29
library/SGsAP_Templates.ttcn
View File

@ -13,6 +13,7 @@ module SGsAP_Templates {
import from SGsAP_Types all;
import from GSM_Types all;
import from General_Types all;
import from Osmocom_Types all;
import from MobileL3_CommonIE_Types all;
/* 9.4.2 */
@ -162,6 +163,29 @@ function tr_SGsAP_IE_Lai_omit(template LocationAreaIdValue lai) return template
}
}
/* 9.4.21a */
template (value) TrackingAreaIdentityValue ts_SGsAP_TAI(GsmMcc mcc, GsmMnc mnc, uint16_t tac) := {
mccDigit1 := mcc[0],
mccDigit2 := mcc[1],
mccDigit3 := mcc[2],
mncDigit3 := f_enc_mnc_digit3(mnc),
mncDigit1 := mnc[0],
mncDigit2 := mnc[1],
tAC := int2oct(tac, 2)
}
template (value) TrackingAreaIdentity ts_SGsAP_IE_TAI(template (value) TrackingAreaIdentityValue tai) := {
iEI := '00100011'B,
lengthIndicator := 5,
iD := tai
}
function ts_SGsAP_IE_TAI_omit(template (omit) TrackingAreaIdentityValue tai)
return template (omit) TrackingAreaIdentity {
if (istemplatekind(tai, "omit")) {
return omit;
} else {
return ts_SGsAP_IE_TAI(tai);
}
}
/* 9.4.12 */
@ -505,7 +529,8 @@ template PDU_SGsAP tr_SGsAP_LU_REJECT(template hexstring imsi,
template (value) PDU_SGsAP ts_SGsAP_LU_REQ(hexstring imsi,
template (value) octetstring mme_name,
template (value) EPS_location_update_type eps_lu_type,
template (value) LocationAreaIdValue new_lai) := {
template (value) LocationAreaIdValue new_lai,
template (omit) TrackingAreaIdentityValue tAI := omit) := {
sGsAP_LOCATION_UPDATE_REQUEST := {
messageType := '00001001'B,
iMSI := ts_SGsAP_IMSI(imsi),
@ -515,7 +540,7 @@ template (value) PDU_SGsAP ts_SGsAP_LU_REQ(hexstring imsi,
oldLocationAreaId := omit,
tMSI_Status := omit,
iMEI_SV := omit,
tAI := omit,
tAI := ts_SGsAP_IE_TAI_omit(tAI),
eCGI := omit,
tMSI_NRI := omit,
cS_DomainOperator := omit

3
msc/MSC_Tests.ttcn
View File

@ -4541,7 +4541,8 @@ function f_sgs_perform_lu() runs on BSC_ConnHdlr {
f_create_gsup_expect(hex2str(g_pars.imsi));
lur := valueof(ts_SGsAP_LU_REQ(g_pars.imsi, mme_name, IMSI_attach,
ts_SGsAP_LAI('901'H, '70'H, 2342)));
ts_SGsAP_LAI('901'H, '70'H, 2342),
ts_SGsAP_TAI('901'H, '70'H, 555)));
/* Old LAI, if MS sends it */
/* TMSI status, if MS has no valid TMSI */
/* IMEISV, if it supports "automatic device detection" */