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source-CU-CP: trigger E1 PDCP Status Request in UE Context Modification Response handler

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The E1 Bearer Context Modification Request shall send a PDCP Status Request IE
during handover, e.g. the HO context is set to source, and it is not target, i.e.
only in N2 not in F1.

The current function "e1_send_bearer_updates" used to fill the E1 Request has been
refactored only for the sake of this commit and to avoid duplicated and redundant code.
The function itself deeper analysis and eventually a refactoring that will not be addressed
in this commit.
This commit is contained in:
Guido Casati
2025-09-18 11:34:31 +02:00
parent e96d7f9576
commit fc5e3ce61d
1 changed files with 29 additions and 14 deletions
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openair2/RRC/NR/rrc_gNB.c
+29 -14
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@@ -2091,20 +2091,34 @@ static void e1_send_bearer_updates(gNB_RRC_INST *rrc, gNB_RRC_UE_t *UE, int n, f
.gNB_cu_up_ue_id = UE->rrc_ue_id,
};
for (int i = 0; i < n; i++) {
const f1ap_drb_setup_t *drb_f1 = &drbs[i];
rrc_pdu_session_param_t *pdu_ue = find_pduSession_from_drbId(UE, drb_f1->id);
if (pdu_ue == NULL) {
LOG_E(RRC, "UE %d: UE Context Modif Response: no PDU session for DRB ID %d\n", UE->rrc_ue_id, drb_f1->id);
continue;
bool is_inter_cu_ho = UE->ho_context && UE->ho_context->source && !UE->ho_context->target;
for (int i = 0; i < MAX_DRBS_PER_UE; i++) {
int drb_id = i + 1;
DRB_nGRAN_to_mod_t drb_to_mod = {0};
if (n > 0) {
/* DRBs to Setup in F1 UE Context Modifcation Response */
if (i == n)
break;
const f1ap_drb_setup_t *drb_f1 = &drbs[i];
drb_id = drb_f1->id;
fill_e1_bearer_modif(&drb_to_mod, drb_f1);
} else if (is_inter_cu_ho) {
/* On-going handover: send PDCP Status Request */
if (UE->established_drbs[i].status == DRB_INACTIVE)
continue;
drb_to_mod.id = drb_id;
// PDCP SN Status Request
drb_to_mod.pdcp_sn_status_requested = true;
LOG_I(NR_RRC, "PDCP Status requested (drb_id=%d)\n", drb_id);
}
pdu_session_to_mod_t *pdu_e1 = find_or_next_pdu_session(&req, pdu_ue->param.pdusession_id);
DevAssert(pdu_e1 != NULL);
pdu_e1->sessionId = pdu_ue->param.pdusession_id;
DRB_nGRAN_to_mod_t *drb_e1 = &pdu_e1->DRBnGRanModList[pdu_e1->numDRB2Modify];
/* Fill E1 bearer context modification */
fill_e1_bearer_modif(drb_e1, drb_f1);
pdu_e1->numDRB2Modify += 1;
rrc_pdu_session_param_t *pdu = find_pduSession_from_drbId(UE, drb_id);
if (!pdu)
continue;
pdu_session_to_mod_t *to_mod = find_or_next_pdu_session(&req, pdu->param.pdusession_id);
DevAssert(to_mod);
to_mod->sessionId = pdu->param.pdusession_id;
// Fill E1 DRB to Modify item
to_mod->DRBnGRanModList[to_mod->numDRB2Modify++] = drb_to_mod;
}
DevAssert(req.numPDUSessionsMod > 0);
DevAssert(req.numPDUSessions == 0);
@@ -2300,7 +2314,8 @@ static void rrc_CU_process_ue_context_modification_response(MessageDef *msg_p, i
}
gNB_RRC_UE_t *UE = &ue_context_p->ue_context;
if (resp->drbs_len > 0) {
bool is_inter_cu_ho = UE->ho_context && UE->ho_context->source && !UE->ho_context->target;
if (resp->drbs_len > 0 || is_inter_cu_ho) {
store_du_f1u_tunnel(resp->drbs, resp->drbs_len, UE);
e1_send_bearer_updates(rrc, UE, resp->drbs_len, resp->drbs);
}