Robert Schmidt
7a298e73cd
This commit repairs the reestablishment after the introduction of the CU UE ID in the CU, different from the DU UE ID. Now, the CU uses an identifier different from the RNTI, used in the MAC, to refer to UEs. To repair the reestablishment, a number of changes needed to be introduced: - Handle old_gNB_DU_UE_id in MAC The MAC handles the old_gNB_DU_UE_id field in the DL RRC Message. The commit adds encoding/decoding of the field. The MAC will drop the old UE, but retain the CellGroup of the corresponding UE(!). Because a UE releases the spCellGroup on reestablishment, the MAC does the same; it needs to reapply the old configuration after a reconfiguration. For the latter, introduce new variables to keep a "future" CellGroupConfig to be applied (reconfigCellGroup) and a flag (expect_reconfiguration) that applies the CellGroupConfig if a DL RRC Message transfer on DCCH, which is assumed to be the reconfiguration. - Add RNTI change in RLC The RLC needs to reuse the old UE context. Hence, we simply change the RNTI in the old context, and delete the new one. - No PDCP UE ID change The previous implementation of the PDCP used the RNTI; hence, the ID needed to be switch (as above for the RLC). Since the PDCP now also uses the CU UE ID, no identifier change is needed, and we remove all corresponding code. - No MAC modifications/update from CU As foreseen by the spec, the CU does not modify or change the cellGroupConfig in the RRC during reestablishment. This change will be generalized in the future to all of the RRC. Also, the nr_rrc_mac_remove_ue() function has been removed: the MAC handles any UE changes autonomeously, without being triggered from the RRC explicitly. - Remove reestablish_rnti_map The RRC does not use RNTIs for UE identification. Hence, a reestablish_rnti_map to link two UEs to each other is not necessary anymore.
285 lines
12 KiB
C
285 lines
12 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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/*! \file f1ap_du_rrc_message_transfer.c
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* \brief f1ap rrc message transfer for DU
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* \author EURECOM/NTUST
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* \date 2018
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* \version 0.1
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* \company Eurecom
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* \email: navid.nikaein@eurecom.fr, bing-kai.hong@eurecom.fr
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* \note
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* \warning
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*/
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#include "f1ap_common.h"
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#include "f1ap_encoder.h"
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#include "f1ap_itti_messaging.h"
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#include "f1ap_du_rrc_message_transfer.h"
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#include "uper_decoder.h"
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#include "NR_DL-CCCH-Message.h"
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#include "NR_UL-CCCH-Message.h"
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#include "NR_DL-DCCH-Message.h"
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#include "NR_UL-DCCH-Message.h"
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// for SRB1_logicalChannelConfig_defaultValue
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#include "rrc_extern.h"
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#include "common/ran_context.h"
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#include "openair2/RRC/NR/rrc_gNB_UE_context.h"
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#include "asn1_msg.h"
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#include "intertask_interface.h"
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#include "LAYER2/NR_MAC_gNB/mac_proto.h"
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#include <openair3/ocp-gtpu/gtp_itf.h>
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#include "openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.h"
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/* DL RRC Message Transfer */
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int DU_handle_DL_RRC_MESSAGE_TRANSFER(instance_t instance,
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uint32_t assoc_id,
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uint32_t stream,
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F1AP_F1AP_PDU_t *pdu) {
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F1AP_DLRRCMessageTransfer_t *container;
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F1AP_DLRRCMessageTransferIEs_t *ie;
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int executeDuplication;
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//uint64_t subscriberProfileIDforRFP;
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//uint64_t rAT_FrequencySelectionPriority;
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DevAssert(pdu != NULL);
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container = &pdu->choice.initiatingMessage->value.choice.DLRRCMessageTransfer;
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/* GNB_CU_UE_F1AP_ID */
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F1AP_FIND_PROTOCOLIE_BY_ID(F1AP_DLRRCMessageTransferIEs_t, ie, container,
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F1AP_ProtocolIE_ID_id_gNB_CU_UE_F1AP_ID, true);
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uint32_t cu_ue_f1ap_id = ie->value.choice.GNB_CU_UE_F1AP_ID;
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/* GNB_DU_UE_F1AP_ID */
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F1AP_FIND_PROTOCOLIE_BY_ID(F1AP_DLRRCMessageTransferIEs_t, ie, container,
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F1AP_ProtocolIE_ID_id_gNB_DU_UE_F1AP_ID, true);
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uint32_t du_ue_f1ap_id = ie->value.choice.GNB_DU_UE_F1AP_ID;
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/* optional */
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/* oldgNB_DU_UE_F1AP_ID */
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uint32_t *old_gNB_DU_ue_id = NULL;
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uint32_t old_gNB_DU_ue_id_stack = 0;
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F1AP_FIND_PROTOCOLIE_BY_ID(F1AP_DLRRCMessageTransferIEs_t, ie, container,
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F1AP_ProtocolIE_ID_id_oldgNB_DU_UE_F1AP_ID, false);
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if (ie) {
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/* strange: it is not named OLD_GNB_DU_UE... */
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old_gNB_DU_ue_id_stack = ie->value.choice.GNB_DU_UE_F1AP_ID_1;
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old_gNB_DU_ue_id = &old_gNB_DU_ue_id_stack;
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gtpv1u_update_ue_id(getCxt(false, instance)->gtpInst, old_gNB_DU_ue_id_stack, du_ue_f1ap_id);
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}
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/* mandatory */
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/* SRBID */
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F1AP_FIND_PROTOCOLIE_BY_ID(F1AP_DLRRCMessageTransferIEs_t, ie, container,
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F1AP_ProtocolIE_ID_id_SRBID, true);
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uint64_t srb_id = ie->value.choice.SRBID;
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LOG_D(F1AP, "srb_id %lu \n", srb_id);
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/* optional */
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/* ExecuteDuplication */
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if (0) {
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F1AP_FIND_PROTOCOLIE_BY_ID(F1AP_DLRRCMessageTransferIEs_t, ie, container,
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F1AP_ProtocolIE_ID_id_ExecuteDuplication, true);
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executeDuplication = ie->value.choice.ExecuteDuplication;
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LOG_D(F1AP, "ExecuteDuplication %d \n", executeDuplication);
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}
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// issue in here
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/* mandatory */
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/* RRC Container */
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F1AP_FIND_PROTOCOLIE_BY_ID(F1AP_DLRRCMessageTransferIEs_t, ie, container,
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F1AP_ProtocolIE_ID_id_RRCContainer, true);
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/* optional */
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/* RAT_FrequencyPriorityInformation */
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if (0) {
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F1AP_FIND_PROTOCOLIE_BY_ID(F1AP_DLRRCMessageTransferIEs_t, ie, container,
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F1AP_ProtocolIE_ID_id_RAT_FrequencyPriorityInformation, true);
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switch(ie->value.choice.RAT_FrequencyPriorityInformation.present) {
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case F1AP_RAT_FrequencyPriorityInformation_PR_eNDC:
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//subscriberProfileIDforRFP = ie->value.choice.RAT_FrequencyPriorityInformation.choice.subscriberProfileIDforRFP;
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break;
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case F1AP_RAT_FrequencyPriorityInformation_PR_nGRAN:
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//rAT_FrequencySelectionPriority = ie->value.choice.RAT_FrequencyPriorityInformation.choice.rAT_FrequencySelectionPriority;
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break;
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default:
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LOG_W(F1AP, "unhandled IE RAT_FrequencyPriorityInformation.present\n");
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break;
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}
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}
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f1ap_dl_rrc_message_t dl_rrc = {
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.gNB_CU_ue_id = cu_ue_f1ap_id,
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.gNB_DU_ue_id = du_ue_f1ap_id,
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.old_gNB_DU_ue_id = old_gNB_DU_ue_id,
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.rrc_container_length = ie->value.choice.RRCContainer.size,
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.rrc_container = ie->value.choice.RRCContainer.buf,
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.srb_id = srb_id
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};
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dl_rrc_message_transfer(&dl_rrc);
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return 0;
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}
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/* UL RRC Message Transfer */
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int DU_send_INITIAL_UL_RRC_MESSAGE_TRANSFER(instance_t instanceP, const f1ap_initial_ul_rrc_message_t *msg)
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{
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F1AP_F1AP_PDU_t pdu= {0};
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F1AP_InitialULRRCMessageTransfer_t *out;
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uint8_t *buffer=NULL;
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uint32_t len=0;
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/* Create */
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/* 0. Message Type */
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pdu.present = F1AP_F1AP_PDU_PR_initiatingMessage;
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asn1cCalloc(pdu.choice.initiatingMessage, tmp);
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tmp->procedureCode = F1AP_ProcedureCode_id_InitialULRRCMessageTransfer;
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tmp->criticality = F1AP_Criticality_ignore;
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tmp->value.present = F1AP_InitiatingMessage__value_PR_InitialULRRCMessageTransfer;
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out = &tmp->value.choice.InitialULRRCMessageTransfer;
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/* mandatory */
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/* c1. GNB_DU_UE_F1AP_ID */
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asn1cSequenceAdd(out->protocolIEs.list, F1AP_InitialULRRCMessageTransferIEs_t, ie1);
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ie1->id = F1AP_ProtocolIE_ID_id_gNB_DU_UE_F1AP_ID;
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ie1->criticality = F1AP_Criticality_reject;
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ie1->value.present = F1AP_InitialULRRCMessageTransferIEs__value_PR_GNB_DU_UE_F1AP_ID;
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ie1->value.choice.GNB_DU_UE_F1AP_ID = msg->gNB_DU_ue_id;
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/* mandatory */
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/* c2. NRCGI */
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asn1cSequenceAdd(out->protocolIEs.list, F1AP_InitialULRRCMessageTransferIEs_t, ie2);
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ie2->id = F1AP_ProtocolIE_ID_id_NRCGI;
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ie2->criticality = F1AP_Criticality_reject;
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ie2->value.present = F1AP_InitialULRRCMessageTransferIEs__value_PR_NRCGI;
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//Fixme: takes always the first cell
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addnRCGI(ie2->value.choice.NRCGI, getCxt(DUtype, instanceP)->setupReq.cell);
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/* mandatory */
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/* c3. C_RNTI */ // 16
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asn1cSequenceAdd(out->protocolIEs.list, F1AP_InitialULRRCMessageTransferIEs_t, ie3);
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ie3->id = F1AP_ProtocolIE_ID_id_C_RNTI;
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ie3->criticality = F1AP_Criticality_reject;
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ie3->value.present = F1AP_InitialULRRCMessageTransferIEs__value_PR_C_RNTI;
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ie3->value.choice.C_RNTI = msg->crnti;
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/* mandatory */
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/* c4. RRCContainer */
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asn1cSequenceAdd(out->protocolIEs.list, F1AP_InitialULRRCMessageTransferIEs_t, ie4);
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ie4->id = F1AP_ProtocolIE_ID_id_RRCContainer;
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ie4->criticality = F1AP_Criticality_reject;
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ie4->value.present = F1AP_InitialULRRCMessageTransferIEs__value_PR_RRCContainer;
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OCTET_STRING_fromBuf(&ie4->value.choice.RRCContainer, (const char *)msg->rrc_container, msg->rrc_container_length);
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/* optional */
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/* c5. DUtoCURRCContainer */
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if (msg->du2cu_rrc_container != NULL) {
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asn1cSequenceAdd(out->protocolIEs.list, F1AP_InitialULRRCMessageTransferIEs_t, ie5);
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ie5->id = F1AP_ProtocolIE_ID_id_DUtoCURRCContainer;
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ie5->criticality = F1AP_Criticality_reject;
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ie5->value.present = F1AP_InitialULRRCMessageTransferIEs__value_PR_DUtoCURRCContainer;
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OCTET_STRING_fromBuf(&ie5->value.choice.DUtoCURRCContainer,
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(const char *)msg->du2cu_rrc_container,
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msg->du2cu_rrc_container_length);
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}
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/* mandatory */
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/* c6. Transaction ID (integer value) */
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asn1cSequenceAdd(out->protocolIEs.list, F1AP_InitialULRRCMessageTransferIEs_t, ie6);
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ie6->id = F1AP_ProtocolIE_ID_id_TransactionID;
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ie6->criticality = F1AP_Criticality_ignore;
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ie6->value.present = F1AP_InitialULRRCMessageTransferIEs__value_PR_TransactionID;
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ie6->value.choice.TransactionID = F1AP_get_next_transaction_identifier(0, 0);
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/* encode */
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if (f1ap_encode_pdu(&pdu, &buffer, &len) < 0) {
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LOG_E(F1AP, "Failed to encode F1 INITIAL UL RRC MESSAGE TRANSFER\n");
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return -1;
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}
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f1ap_itti_send_sctp_data_req(false, instanceP, buffer, len, getCxt(DUtype, instanceP)->default_sctp_stream_id);
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return 0;
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}
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int DU_send_UL_NR_RRC_MESSAGE_TRANSFER(instance_t instance, const f1ap_ul_rrc_message_t *msg)
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{
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F1AP_F1AP_PDU_t pdu= {0};
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F1AP_ULRRCMessageTransfer_t *out;
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uint8_t *buffer = NULL;
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uint32_t len;
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LOG_D(F1AP,
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"[DU %ld] %s: size %d UE RNTI %x in SRB %d\n",
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instance,
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__func__,
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msg->rrc_container_length,
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msg->gNB_DU_ue_id,
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msg->srb_id);
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//for (int i = 0;i < msg->rrc_container_length; i++)
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// printf("%02x ", msg->rrc_container[i]);
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//printf("\n");
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/* Create */
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/* 0. Message Type */
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pdu.present = F1AP_F1AP_PDU_PR_initiatingMessage;
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asn1cCalloc(pdu.choice.initiatingMessage, tmp);
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tmp->procedureCode = F1AP_ProcedureCode_id_ULRRCMessageTransfer;
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tmp->criticality = F1AP_Criticality_ignore;
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tmp->value.present = F1AP_InitiatingMessage__value_PR_ULRRCMessageTransfer;
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out = &tmp->value.choice.ULRRCMessageTransfer;
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/* mandatory */
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/* c1. GNB_CU_UE_F1AP_ID */
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asn1cSequenceAdd(out->protocolIEs.list, F1AP_ULRRCMessageTransferIEs_t, ie1);
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ie1->id = F1AP_ProtocolIE_ID_id_gNB_CU_UE_F1AP_ID;
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ie1->criticality = F1AP_Criticality_reject;
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ie1->value.present = F1AP_ULRRCMessageTransferIEs__value_PR_GNB_CU_UE_F1AP_ID;
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ie1->value.choice.GNB_CU_UE_F1AP_ID = msg->gNB_CU_ue_id;
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/* mandatory */
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/* c2. GNB_DU_UE_F1AP_ID */
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asn1cSequenceAdd(out->protocolIEs.list, F1AP_ULRRCMessageTransferIEs_t, ie2);
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ie2->id = F1AP_ProtocolIE_ID_id_gNB_DU_UE_F1AP_ID;
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ie2->criticality = F1AP_Criticality_reject;
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ie2->value.present = F1AP_ULRRCMessageTransferIEs__value_PR_GNB_DU_UE_F1AP_ID;
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ie2->value.choice.GNB_DU_UE_F1AP_ID = msg->gNB_DU_ue_id;
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/* mandatory */
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/* c3. SRBID */
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asn1cSequenceAdd(out->protocolIEs.list, F1AP_ULRRCMessageTransferIEs_t, ie3);
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ie3->id = F1AP_ProtocolIE_ID_id_SRBID;
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ie3->criticality = F1AP_Criticality_reject;
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ie3->value.present = F1AP_ULRRCMessageTransferIEs__value_PR_SRBID;
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ie3->value.choice.SRBID = msg->srb_id;
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// issue in here
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/* mandatory */
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/* c4. RRCContainer */
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asn1cSequenceAdd(out->protocolIEs.list, F1AP_ULRRCMessageTransferIEs_t, ie4);
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ie4->id = F1AP_ProtocolIE_ID_id_RRCContainer;
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ie4->criticality = F1AP_Criticality_reject;
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ie4->value.present = F1AP_ULRRCMessageTransferIEs__value_PR_RRCContainer;
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OCTET_STRING_fromBuf(&ie4->value.choice.RRCContainer,
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(const char *) msg->rrc_container,
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msg->rrc_container_length);
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/* encode */
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if (f1ap_encode_pdu(&pdu, &buffer, &len) < 0) {
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LOG_E(F1AP, "Failed to encode F1 UL RRC MESSAGE TRANSFER \n");
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return -1;
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}
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f1ap_itti_send_sctp_data_req(false, instance, buffer, len, getCxt(DUtype, instance)->default_sctp_stream_id);
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return 0;
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}
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