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Forward AMF UE NGAP ID to RRC on DL NAS Message

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In the Initial Context Setup message, the NGAP forwards the AMF UE ID,
but not in the DL NAS Message, although 38.413 says, in $8.3.1.2 either

> The NG-RAN node shall use the AMF UE NGAP ID IE and RAN UE NGAP ID IE
> received in the INITIAL CONTEXT SETUP REQUEST message as identification
> of the logical connection

or in $8.6.2.2

> The NG-RAN node shall use the AMF UE NGAP ID IE and RAN UE NGAP ID IE
> received in the DOWNLINK NAS TRANSPORT message as identification of the
> logical connection

So forward in both cases for harmonization.
This commit is contained in:
Robert Schmidt
2026-01-13 13:27:24 +01:00
parent c003096176
commit f1db9cb158
5 changed files with 15 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair2/COMMON/ngap_messages_types.h
+2
View File
@@ -737,6 +737,8 @@ typedef struct ngap_ue_ctxt_modification_resp_s {
typedef struct ngap_downlink_nas_s {
/* UE id for initial connection to NGAP */
uint32_t gNB_ue_ngap_id;
/* UE id at AMF */
uint64_t amf_ue_ngap_id;
/* NAS pdu */
byte_array_t nas_pdu;
} ngap_downlink_nas_t;
openair2/RRC/NR/rrc_gNB_NGAP.c
+1
View File
@@ -717,6 +717,7 @@ int rrc_gNB_process_NGAP_DOWNLINK_NAS(MessageDef *msg_p, instance_t instance, mu
}
gNB_RRC_UE_t *UE = &ue_context_p->ue_context;
UE->amf_ue_ngap_id = req->amf_ue_ngap_id;
UE->nas_pdu = req->nas_pdu;
rrc_forward_ue_nas_message(rrc, UE);
return 0;
openair3/NGAP/ngap_gNB_itti_messaging.c
+2 -1
View File
@@ -54,7 +54,7 @@ void ngap_gNB_itti_send_sctp_data_req(instance_t instance,
itti_send_msg_to_task(TASK_SCTP, instance, message_p);
}
void ngap_gNB_itti_send_nas_downlink_ind(instance_t instance, uint32_t gNB_ue_ngap_id, uint8_t *nas_pdu, uint32_t nas_pdu_length)
void ngap_gNB_itti_send_nas_downlink_ind(instance_t instance, uint32_t gNB_ue_ngap_id, uint64_t amf_ue_ngap_id, uint8_t *nas_pdu, uint32_t nas_pdu_length)
{
MessageDef *message_p;
ngap_downlink_nas_t *ngap_downlink_nas;
@@ -64,6 +64,7 @@ void ngap_gNB_itti_send_nas_downlink_ind(instance_t instance, uint32_t gNB_ue_ng
ngap_downlink_nas = &message_p->ittiMsg.ngap_downlink_nas;
ngap_downlink_nas->gNB_ue_ngap_id = gNB_ue_ngap_id;
ngap_downlink_nas->amf_ue_ngap_id = amf_ue_ngap_id;
ngap_downlink_nas->nas_pdu = create_byte_array(nas_pdu_length, nas_pdu);
itti_send_msg_to_task(TASK_RRC_GNB, instance, message_p);
openair3/NGAP/ngap_gNB_itti_messaging.h
+5 -1
View File
@@ -40,7 +40,11 @@ void ngap_gNB_itti_send_sctp_data_req(instance_t instance,
uint32_t buffer_length,
uint16_t stream);
void ngap_gNB_itti_send_nas_downlink_ind(instance_t instance, uint32_t gNB_ue_ngap_id, uint8_t *nas_pdu, uint32_t nas_pdu_length);
void ngap_gNB_itti_send_nas_downlink_ind(instance_t instance,
uint32_t gNB_ue_ngap_id,
uint64_t amf_ue_ngap_id,
uint8_t *nas_pdu,
uint32_t nas_pdu_length);
void ngap_gNB_itti_send_sctp_close_association(instance_t instance, sctp_assoc_t assoc_id);
openair3/NGAP/ngap_gNB_nas_procedures.c
+5 -1
View File
@@ -361,7 +361,11 @@ int ngap_gNB_handle_nas_downlink(sctp_assoc_t assoc_id, uint32_t stream, NGAP_NG
NGAP_FIND_PROTOCOLIE_BY_ID(NGAP_DownlinkNASTransport_IEs_t, ie, container,
NGAP_ProtocolIE_ID_id_NAS_PDU, true);
/* Forward the NAS PDU to NR-RRC */
ngap_gNB_itti_send_nas_downlink_ind(ngap_gNB_instance->instance, ue_desc_p->gNB_ue_ngap_id, ie->value.choice.NAS_PDU.buf, ie->value.choice.NAS_PDU.size);
ngap_gNB_itti_send_nas_downlink_ind(ngap_gNB_instance->instance,
ue_desc_p->gNB_ue_ngap_id,
ue_desc_p->amf_ue_ngap_id,
ie->value.choice.NAS_PDU.buf,
ie->value.choice.NAS_PDU.size);
return 0;
}