Robert Schmidt
b6ccf8aa77
This commit implements reestablishment during handover when occurring at the source DU, either as a handover Failure or "normal" reestablishment (something else went wrong). In this case, the CU will trigger HO cancel, which in F1, means to cancel on the target DU. Also, undo any previous ID changes. Retain the old CellGroupConfig (before handover) for the case of reestablishment at source. If not needed, it is freed after the reconfiguration complete. Reestablishment on target cell during handover cannot be handled by the gNB (yet). It is the same as with a normal reestablishment (not during handover) on a different cell: that cell has no notion of the old UE, so we cannot simply indicate the old UE to reestablish; at least, we would need to cleanup the CellGroupConfig, and I am not sure this works out of the box, either.
78 lines
3.2 KiB
C
78 lines
3.2 KiB
C
/* 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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#ifndef RRC_GNB_MOBILITY_H_
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#define RRC_GNB_MOBILITY_H_
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#include <stdint.h>
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/* forward declarations */
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typedef struct gNB_RRC_INST_s gNB_RRC_INST;
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typedef struct gNB_RRC_UE_s gNB_RRC_UE_t;
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typedef struct nr_rrc_du_container_t nr_rrc_du_container_t;
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typedef struct NR_CellGroupConfig NR_CellGroupConfig_t;
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typedef void (*ho_cancel_t)(gNB_RRC_INST *rrc, gNB_RRC_UE_t *ue);
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typedef struct nr_ho_source_cu {
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/// pointer to the (source) DU structure
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const nr_rrc_du_container_t *du;
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/// (source) DU UE ID; in F1, the DU UE ID will change to the new (target) DU
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/// UE ID during handover, and the CU needs to keep track of this in case of
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/// reestablishment
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uint32_t du_ue_id;
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/// old (source) RNTI (to recognize a UE during reestablishment)
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rnti_t old_rnti;
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/// old (source) CellGroupConfig (to send the cellGroupConfig in case of
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/// reestablishment)
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NR_CellGroupConfig_t *old_cellGroupConfig;
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/// function pointer to announce the handover cancellation, e.g.,
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/// reestablishment
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ho_cancel_t ho_cancel;
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} nr_ho_source_cu_t;
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/* acknowledgement of handover request. buf+len is the RRC Reconfiguration */
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typedef void (*ho_req_ack_t)(gNB_RRC_INST *rrc, gNB_RRC_UE_t *ue, uint8_t *buf, uint32_t len);
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typedef void (*ho_success_t)(gNB_RRC_INST *rrc, gNB_RRC_UE_t *ue);
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typedef struct nr_ho_target_cu {
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/// pointer to the (target) DU structure
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const nr_rrc_du_container_t *du;
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/// (target) DU UE ID; the (source) DU UE ID will change to the new (target)
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/// DU UE ID after sending a reconfiguration, which is later than when
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/// receiving this ID
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uint32_t du_ue_id;
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/// new (target) RNTI (as for du_ue_id)
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rnti_t new_rnti;
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/// function pointer to announce handover request acknowledgment
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ho_req_ack_t ho_req_ack;
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/// function pointer to announce handover success
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ho_success_t ho_success;
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} nr_ho_target_cu_t;
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typedef struct nr_handover_context_s {
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nr_ho_source_cu_t *source;
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nr_ho_target_cu_t *target;
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} nr_handover_context_t;
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void nr_rrc_trigger_f1_ho(gNB_RRC_INST *rrc, gNB_RRC_UE_t *ue, nr_rrc_du_container_t *source_du, nr_rrc_du_container_t *target_du);
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void nr_rrc_finalize_ho(gNB_RRC_UE_t *ue);
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#endif /* RRC_GNB_MOBILITY_H_ */
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