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.
59 lines
2.5 KiB
C
59 lines
2.5 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 rrc_eNB_UE_context.h
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* \brief rrc procedures for UE context
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* \author Lionel GAUTHIER
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* \date 2015
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* \version 1.0
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* \company Eurecom
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* \email: lionel.gauthier@eurecom.fr
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*/
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#ifndef __RRC_GNB_UE_CONTEXT_H__
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#define __RRC_GNB_UE_CONTEXT_H__
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#include "collection/tree.h"
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#include "COMMON/platform_types.h"
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#include "nr_rrc_defs.h"
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int rrc_gNB_compare_ue_rnti_id(rrc_gNB_ue_context_t* c1_pP, rrc_gNB_ue_context_t* c2_pP);
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RB_PROTOTYPE(rrc_nr_ue_tree_s, rrc_gNB_ue_context_s, entries, rrc_gNB_compare_ue_rnti_id);
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rrc_gNB_ue_context_t* rrc_gNB_allocate_new_ue_context(gNB_RRC_INST* rrc_instance_pP);
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rrc_gNB_ue_context_t* rrc_gNB_get_ue_context(gNB_RRC_INST* rrc_instance_pP, ue_id_t ue);
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rrc_gNB_ue_context_t* rrc_gNB_get_ue_context_by_rnti(gNB_RRC_INST* rrc_instance_pP, rnti_t rntiP);
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void rrc_gNB_free_mem_ue_context(rrc_gNB_ue_context_t* const ue_context_pP);
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void rrc_gNB_remove_ue_context(gNB_RRC_INST* rrc_instance_pP, rrc_gNB_ue_context_t* ue_context_pP);
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rrc_gNB_ue_context_t* rrc_gNB_ue_context_random_exist(gNB_RRC_INST* rrc_instance_pP, const uint64_t ue_identityP);
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rrc_gNB_ue_context_t* rrc_gNB_ue_context_5g_s_tmsi_exist(gNB_RRC_INST* rrc_instance_pP, const uint64_t s_TMSI);
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rrc_gNB_ue_context_t* rrc_gNB_create_ue_context(rnti_t rnti,
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gNB_RRC_INST* rrc_instance_pP,
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const uint64_t ue_identityP,
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uint32_t du_ue_id);
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#endif
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