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Handle PDU session resource setup for existing PDU session

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38.413 section 8.2.1.4 says that if PDU session resource setup req
contains an existing PDU session, that one should be reported as failed.
That is rather complicated for us to do; simply reject all PDU sessions
and let the core deal with that.
This commit is contained in:
Robert Schmidt
2025-04-02 08:03:17 +02:00
parent 5625bc63d1
commit 59575b9cde
1 changed files with 15 additions and 0 deletions
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openair2/RRC/NR/rrc_gNB_NGAP.c
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@@ -872,6 +872,21 @@ void rrc_gNB_process_NGAP_PDUSESSION_SETUP_REQ(MessageDef *msg_p, instance_t ins
return;
}
// Reject PDU session if at least one exists already with that ID.
// At least one because marking one as existing, and setting up another, that
// might be more work than is worth it. See 8.2.1.4 in 38.413
for (int i = 0; i < msg->nb_pdusessions_tosetup; ++i) {
const pdusession_t *p = &msg->pdusession_setup_params[i];
rrc_pdu_session_param_t *exist = find_pduSession(UE, p->pdusession_id, false /* don't create */);
if (exist) {
LOG_E(NR_RRC, "UE %d: already has existing PDU session %d rejecting PDU Session Resource Setup Request\n", UE->rrc_ue_id, p->pdusession_id);
ngap_cause_t cause = {.type = NGAP_CAUSE_RADIO_NETWORK, .value = NGAP_CAUSE_RADIO_NETWORK_MULTIPLE_PDU_SESSION_ID_INSTANCES};
send_ngap_pdu_session_setup_resp_fail(instance, msg, cause);
rrc_forward_ue_nas_message(rrc, UE);
return;
}
}
UE->amf_ue_ngap_id = msg->amf_ue_ngap_id;
if (!trigger_bearer_setup(rrc, UE, msg->nb_pdusessions_tosetup, msg->pdusession_setup_params, msg->ueAggMaxBitRateDownlink)) {