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Add NGAP Handover Request Acknowledge encoder and RRC callback

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This commit completes the NG Mobility Management Procedure known as
Handover Resource Allocation. The outbound message is sent by the
target NG-RAN and is known as Handover Request Acknowledge.

Major changes:

* add RRC callback to trigger the generation of NG Handover
  Request Acknowledge on the target NG-RAN
* add NG Handover Request Acknowledge encoder

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 461cfb7911
commit fa75484e13
7 changed files with 215 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair2/COMMON/ngap_messages_def.h
+1
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@@ -73,6 +73,7 @@ MESSAGE_DEF(NGAP_PDUSESSION_MODIFY_RESP , MESSAGE_PRIORITY_MED, ngap_pd
MESSAGE_DEF(NGAP_PDUSESSION_RELEASE_RESPONSE , MESSAGE_PRIORITY_MED, ngap_pdusession_release_resp_t , ngap_pdusession_release_resp)
MESSAGE_DEF(NGAP_HANDOVER_REQUIRED, MESSAGE_PRIORITY_MED, ngap_handover_required_t, ngap_handover_required)
MESSAGE_DEF(NGAP_HANDOVER_FAILURE, MESSAGE_PRIORITY_MED, ngap_handover_failure_t, ngap_handover_failure)
MESSAGE_DEF(NGAP_HANDOVER_REQUEST_ACKNOWLEDGE, MESSAGE_PRIORITY_MED, ngap_handover_request_ack_t, ngap_handover_request_ack)
/* NGAP -> RRC messages */
MESSAGE_DEF(NGAP_DOWNLINK_NAS , MESSAGE_PRIORITY_MED, ngap_downlink_nas_t , ngap_downlink_nas )
openair2/COMMON/ngap_messages_types.h
+31
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@@ -68,6 +68,7 @@
#define NGAP_HANDOVER_REQUIRED(mSGpTR) (mSGpTR)->ittiMsg.ngap_handover_required
#define NGAP_HANDOVER_FAILURE(mSGpTR) (mSGpTR)->ittiMsg.ngap_handover_failure
#define NGAP_HANDOVER_REQUEST(mSGpTR) (mSGpTR)->ittiMsg.ngap_handover_request
#define NGAP_HANDOVER_REQUEST_ACKNOWLEDGE(mSGpTR) (mSGpTR)->ittiMsg.ngap_handover_request_ack
#define NGAP_UE_CONTEXT_RELEASE_REQ(mSGpTR) (mSGpTR)->ittiMsg.ngap_ue_release_req
#define NGAP_PDUSESSION_RELEASE_COMMAND(mSGpTR) (mSGpTR)->ittiMsg.ngap_pdusession_release_command
@@ -617,6 +618,36 @@ typedef struct {
nr_guami_t guami;
} ngap_handover_request_t;
/* 9.3.4.11 3GPP TS 38.413 */
typedef struct {
// QoS Flow Setup Response List
uint8_t nb_of_qos_flow;
pdusession_associate_qosflow_t qos_setup_list[QOSFLOW_MAX_VALUE];
// DL NG-U UP TNL Information
uint32_t gtp_teid;
transport_layer_addr_t gNB_addr;
} ho_request_ack_transfer_t;
/* 9.2.3.5 3GPP TS 38.413 */
typedef struct {
// PDU Session ID (M)
uint8_t pdu_session_id;
// Handover Request Acknowledge Transfer (M)
ho_request_ack_transfer_t ack_transfer;
} pdu_session_resource_admitted_t;
typedef struct {
// AMF UE NGAP ID
uint32_t gNB_ue_ngap_id;
// RAN UE NGAP ID
uint64_t amf_ue_ngap_id;
// PDU Session Resource Admitted List
pdu_session_resource_admitted_t pdusessions[NGAP_MAX_PDU_SESSION];
uint8_t nb_of_pdusessions;
// Target to Source Transparent Container
byte_array_t target2source;
} ngap_handover_request_ack_t;
typedef struct ngap_ue_cap_info_ind_s {
uint32_t gNB_ue_ngap_id;
byte_array_t ue_radio_cap;
openair2/RRC/NR/rrc_gNB_NGAP.c
+36
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@@ -1270,6 +1270,42 @@ void rrc_gNB_send_NGAP_UE_CAPABILITIES_IND(gNB_RRC_INST *rrc, gNB_RRC_UE_t *UE,
LOG_I(NR_RRC,"Send message to ngap: NGAP_UE_CAPABILITIES_IND\n");
}
void rrc_gNB_send_NGAP_HANDOVER_REQUEST_ACKNOWLEDGE(gNB_RRC_INST *rrc, gNB_RRC_UE_t *UE, byte_array_t ho_command)
{
LOG_D(NR_RRC, "Sending Handover Request Acknowledge\n");
MessageDef *msg_p = itti_alloc_new_message(TASK_RRC_GNB, 0, NGAP_HANDOVER_REQUEST_ACKNOWLEDGE);
ngap_handover_request_ack_t *msg = &NGAP_HANDOVER_REQUEST_ACKNOWLEDGE(msg_p);
memset(msg, 0, sizeof(*msg));
// RAN UE NGAP ID
msg->gNB_ue_ngap_id = UE->rrc_ue_id;
// AMF UE NGAP ID
msg->amf_ue_ngap_id = UE->amf_ue_ngap_id;
// PDU Session Resource Admitted List
msg->nb_of_pdusessions = UE->nb_of_pdusessions;
for (int i = 0; i < UE->nb_of_pdusessions; i++) {
rrc_pdu_session_param_t *session = &UE->pduSession[i];
session->status = PDU_SESSION_STATUS_ESTABLISHED;
// PDU Session ID
msg->pdusessions[i].pdu_session_id = session->param.pdusession_id;
// Handover Request Acknowledge Transfer
ho_request_ack_transfer_t *transfer = &msg->pdusessions[i].ack_transfer;
transfer->gtp_teid = session->param.n3_outgoing.teid;
memcpy(transfer->gNB_addr.buffer, session->param.n3_outgoing.addr.buffer, session->param.n3_outgoing.addr.length);
transfer->gNB_addr.length = session->param.n3_outgoing.addr.length;
transfer->nb_of_qos_flow = session->param.nb_qos;
for (int q = 0; q < transfer->nb_of_qos_flow; q++) {
transfer->qos_setup_list[q].qfi = session->param.qos[q].qfi;
transfer->qos_setup_list[q].qos_flow_mapping_ind = QOSFLOW_MAPPING_INDICATION_DL;
}
}
// Target to Source Transparent Container
msg->target2source = copy_byte_array(ho_command);
itti_send_msg_to_task(TASK_NGAP, rrc->module_id, msg_p);
}
void rrc_gNB_send_NGAP_PDUSESSION_RELEASE_RESPONSE(gNB_RRC_INST *rrc, gNB_RRC_UE_t *UE, uint8_t xid)
{
int pdu_sessions_released = 0;
openair2/RRC/NR/rrc_gNB_NGAP.h
+2
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@@ -99,4 +99,6 @@ void rrc_gNB_send_NGAP_HANDOVER_FAILURE(gNB_RRC_INST *rrc, ngap_handover_failure
int rrc_gNB_process_Handover_Request(gNB_RRC_INST *rrc, instance_t instance, ngap_handover_request_t *msg);
void rrc_gNB_free_Handover_Request(ngap_handover_request_t *msg);
void rrc_gNB_send_NGAP_HANDOVER_REQUEST_ACKNOWLEDGE(gNB_RRC_INST *rrc, gNB_RRC_UE_t *UE, byte_array_t ho_command);
#endif