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Handle Release request during handover

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If we release a request from a DU during, handle as follows:

- from the source: Handover is still ongoing, so ignore it by
  acknowledging the release, and marking handover as done. In this case,
  we did not receive an acknowledgement from the target, but since the
  source DU does not keep the UE context, we could not cancel the
  handover anymore either. The UE might come back on any DU through
  reestablishment (or simply be connected on the target)
- from the target: consider this to be a genuine release, and forward to
  AMF.

Co-authored-by: batuhanduyuler <batuhan.duyuler@firecell.io>
Co-authored-by: rmagueta <rmagueta@allbesmart.pt>
This commit is contained in:
Robert Schmidt
2024-10-25 20:10:26 +02:00
co-authored by batuhanduyuler rmagueta
parent a2da391e70
commit 145fd2b415
1 changed files with 27 additions and 2 deletions
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openair2/RRC/NR/rrc_gNB.c
+27 -2
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@@ -1895,7 +1895,7 @@ static void rrc_CU_process_ue_context_setup_response(MessageDef *msg_p, instance
}
}
static void rrc_CU_process_ue_context_release_request(MessageDef *msg_p)
static void rrc_CU_process_ue_context_release_request(MessageDef *msg_p, sctp_assoc_t assoc_id)
{
const int instance = 0;
f1ap_ue_context_release_req_t *req = &F1AP_UE_CONTEXT_RELEASE_REQ(msg_p);
@@ -1906,6 +1906,31 @@ static void rrc_CU_process_ue_context_release_request(MessageDef *msg_p)
return;
}
gNB_RRC_UE_t *UE = &ue_context_p->ue_context;
if (UE->ho_context != NULL) {
nr_ho_source_cu_t *source_ctx = UE->ho_context->source;
bool from_source_du = source_ctx && source_ctx->du->assoc_id == assoc_id;
if (from_source_du) {
// we received release request from the source DU, but HO is still
// ongoing; free the UE, and remove the HO context.
LOG_W(NR_RRC, "UE %d: release request from source DU ID %ld during HO, marking HO as complete\n", UE->rrc_ue_id, source_ctx->du->setup_req->gNB_DU_id);
RETURN_IF_INVALID_ASSOC_ID(source_ctx->du->assoc_id);
f1ap_ue_context_release_cmd_t cmd = {
.gNB_CU_ue_id = UE->rrc_ue_id,
.gNB_DU_ue_id = source_ctx->du_ue_id,
.cause = F1AP_CAUSE_RADIO_NETWORK,
.cause_value = 5, // 5 = F1AP_CauseRadioNetwork_interaction_with_other_procedure
.srb_id = DCCH,
};
rrc->mac_rrc.ue_context_release_command(assoc_id, &cmd);
nr_rrc_finalize_ho(UE);
return;
}
// if we receive the release request from the target DU (regardless if
// successful), we assume it is "genuine" and ask the AMF to release
nr_rrc_finalize_ho(UE);
}
/* TODO: marshall types correctly */
LOG_I(NR_RRC, "received UE Context Release Request for UE %u, forwarding to AMF\n", req->gNB_CU_ue_id);
rrc_gNB_send_NGAP_UE_CONTEXT_RELEASE_REQ(instance,
@@ -2430,7 +2455,7 @@ void *rrc_gnb_task(void *args_p) {
break;
case F1AP_UE_CONTEXT_RELEASE_REQ:
rrc_CU_process_ue_context_release_request(msg_p);
rrc_CU_process_ue_context_release_request(msg_p, msg_p->ittiMsgHeader.originInstance);
break;
case F1AP_UE_CONTEXT_RELEASE_COMPLETE: