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fix (RRC): do not trigger N2 HO when no active PDU sessions are present

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Prevent triggering N2 handover when the UE has no active PDU session
by adding an early check in nr_rrc_trigger_n2_ho(), so we avoid building
an invalid HO Required. This aligns with 3GPP TS 38.413 (§9.2.3.1), where
HANDOVER REQUIRED carries a PDU Session Resource List with at least one
PDU Session Resource Item (range 1..maxnoofPDUSessions).
This commit is contained in:
Guido Casati
2026-04-17 16:46:26 +02:00
parent 38dc378224
commit 389d7a0246
1 changed files with 15 additions and 0 deletions
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openair2/RRC/NR/rrc_gNB_mobility.c
+15
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@@ -552,6 +552,21 @@ void nr_rrc_trigger_n2_ho_target(gNB_RRC_INST *rrc, gNB_RRC_UE_t *ue)
* 2) send NGAP Handover Required message */
void nr_rrc_trigger_n2_ho(gNB_RRC_INST *rrc, gNB_RRC_UE_t *ue, const nr_neighbour_cell_t *neighbour_config)
{
bool has_active_pdu_session = false;
FOR_EACH_SEQ_ARR (rrc_pdu_session_param_t *, pduSession, &ue->pduSessions) {
if (pduSession->status == PDU_SESSION_STATUS_DONE || pduSession->status == PDU_SESSION_STATUS_ESTABLISHED) {
has_active_pdu_session = true;
break;
}
}
/* If there are no active PDU sessions, we can't send the Handover Preparation information
* message to the source gNB (3GPP TS 38.413 §9.2.3.1): Handover Required must carry a PDU
* Session Resource List with at least one PDU Session Resource Item */
if (!has_active_pdu_session) {
LOG_W(NR_RRC, "N2 HO not triggered for UE %u: no active PDU sessions\n", ue->rrc_ue_id);
return;
}
byte_array_t hoPrepInfo = rrc_gNB_generate_HandoverPreparationInformation(rrc, ue);
if (hoPrepInfo.len < 0) {
free_byte_array(hoPrepInfo);