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Add NGAP Handover Required message NGAP encoder and RRC callback on source NG-RAN

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This commit introduces the NG Mobility Management Procedure known as
Handover Preparation. The outbound message is sent by the source NG-RAN
and is known as Handover Required.

* introduce NGAP library for Mobility Management
* introduce NGAP IEs encoder functions for Handover Required and relevant common IEs
* handle RRC trigger in NGAP and Send NGAP Handover Required to the AMF

Co-authored-by: batuhan duyuler <batuhan.duyuler@firecell.io>
This commit is contained in:
Guido Casati
2025-09-18 11:34:30 +02:00
co-authored by batuhan duyuler
parent cfb654e77f
commit 20e534d483
13 changed files with 506 additions and 2 deletions
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openair3/NGAP/ngap_common.c
+29
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@@ -112,3 +112,32 @@ ngap_mobility_restriction_t decode_ngap_mobility_restriction(const NGAP_Mobility
TBCD_TO_MCC_MNC(&in->servingPLMN, out.serving_plmn.mcc, out.serving_plmn.mnc, out.serving_plmn.mnc_digit_length);
return out;
}
void encode_ngap_target_id(NGAP_HandoverRequiredIEs_t *out, const target_ran_node_id_t *in)
{
out->id = NGAP_ProtocolIE_ID_id_TargetID;
out->criticality = NGAP_Criticality_reject;
out->value.present = NGAP_HandoverRequiredIEs__value_PR_TargetID;
// CHOICE Target ID: NG-RAN (M)
out->value.choice.TargetID.present = NGAP_TargetID_PR_targetRANNodeID;
asn1cCalloc(out->value.choice.TargetID.choice.targetRANNodeID, targetRan);
// Global RAN Node ID (M)
targetRan->globalRANNodeID.present = NGAP_GlobalRANNodeID_PR_globalGNB_ID;
asn1cCalloc(targetRan->globalRANNodeID.choice.globalGNB_ID, globalGnbId);
globalGnbId->gNB_ID.present = NGAP_GNB_ID_PR_gNB_ID;
MACRO_GNB_ID_TO_BIT_STRING(in->targetgNBId, &globalGnbId->gNB_ID.choice.gNB_ID);
MCC_MNC_TO_PLMNID(in->plmn_identity.mcc, in->plmn_identity.mnc, in->plmn_identity.mnc_digit_length, &globalGnbId->pLMNIdentity);
// Selected TAI (M)
INT24_TO_OCTET_STRING(in->tac, &targetRan->selectedTAI.tAC);
MCC_MNC_TO_PLMNID(in->plmn_identity.mcc,
in->plmn_identity.mnc,
in->plmn_identity.mnc_digit_length,
&targetRan->selectedTAI.pLMNIdentity);
}
void encode_ngap_nr_cgi(NGAP_NR_CGI_t *out, const plmn_id_t *plmn, const uint32_t cell_id)
{
out->iE_Extensions = NULL;
MCC_MNC_TO_PLMNID(plmn->mcc, plmn->mnc, plmn->mnc_digit_length, &out->pLMNIdentity);
NR_CELL_ID_TO_BIT_STRING(cell_id, &out->nRCellIdentity);
}