Neigbourcell Configuration - Measurement Configuration for Inter gNB - N2 Handover

- NeighbourCell and Measurement Configurations are prepared.

NeighbourCell Configuration includes:
	- neighbour_gNB_ID (This is needed for AMF to identify gNB exists in it's context
	- neighbour_nr_cell_id (This is needed for target gNB)
	- neighbour_physical_cellId (This is needed for UE in the meas report)
	- neighbour_absoluteFrequencySSB (This is needed for UE in meas report)
	- neighbour_subcarrierSpacing (This is needed for UE in meas report)
	- neighbour_mnc (This is needed for AMF)
	- neighbour_mcc (This is needed for AMF)
	- neighbour_mnc_length (This is needed for AMF)
	- neighbour_tracking_area_code (This is needed for AMF)

NR Measurement Event Configuration Includes:
	- enableA2 & enableA3 (gNB activates the event reporting according to these vars)
	- thresholdA2 & A2_TTT (configurable reporting parameters)
	- thresholdA3 & A3_Hysteresis & A3_TTT (configurable reporting parameters)

- These parameters are read in the configuration parsing part and written under RRC structure
- Event Based Measurement Configuration is prepared according to enableA3 parameter.
- Measurement Configuration of UE is cloned under UE Context. When a measurement report comes,
looping through the UE's meas config and matching the measIDs. With this measID, report configs
extracted and processing in different ways.

openair2/GNB_APP/gnb_config.c

@@ -1608,6 +1608,44 @@ void RCconfig_NRRRC(gNB_RRC_INST *rrc)
         char gnbpath[MAX_OPTNAME_SIZE + 8];
         sprintf(gnbpath,"%s.[%i]",GNB_CONFIG_STRING_GNB_LIST,k);
             
+        paramdef_t NeighbourCellParams[] = GNBNEIGHBOURCELLPARAMS_DESC;
+        paramlist_def_t NeighbourCellParamList = {GNB_CONFIG_STRING_NEIGHBOUR_CELL_LIST, NULL, 0};
+
+        config_getlist(config_get_if(), &NeighbourCellParamList, NeighbourCellParams, sizeofArray(NeighbourCellParams), gnbpath);
+        LOG_I(NR_MAC, "HO LOG: Neighbour Cell ELM NUM: %d\n", NeighbourCellParamList.numelt);
+
+        for (uint8_t l = 0; l < NeighbourCellParamList.numelt; ++l) {
+          rrc->neighbourConfiguration[l].neighbour_gNB_ID                 = *(NeighbourCellParamList.paramarray[l][GNB_CONFIG_N_CELL_GNB_ID_IDX].uptr);
+          rrc->neighbourConfiguration[l].neighbour_nrcell_id              = (uint64_t) *(NeighbourCellParamList.paramarray[l][GNB_CONFIG_N_CELL_NR_CELLID_IDX].u64ptr);
+          rrc->neighbourConfiguration[l].physicalCellId                   = *NeighbourCellParamList.paramarray[l][GNB_CONFIG_N_CELL_PHYSICAL_ID_IDX].uptr;
+          rrc->neighbourConfiguration[l].subcarrierSpacing                = *NeighbourCellParamList.paramarray[l][GNB_CONFIG_N_CELL_SCS_IDX].uptr;
+          rrc->neighbourConfiguration[l].absoluteFrequencySSB             = *NeighbourCellParamList.paramarray[l][GNB_CONFIG_N_CELL_ABS_FREQ_SSB_IDX].i64ptr;
+          rrc->neighbourConfiguration[l].neighbour_mcc                    = *NeighbourCellParamList.paramarray[l][GNB_CONFIG_N_CELL_MCC_IDX].uptr;
+          rrc->neighbourConfiguration[l].neighbour_mnc                    = *NeighbourCellParamList.paramarray[l][GNB_CONFIG_N_CELL_MNC_IDX].uptr;
+          rrc->neighbourConfiguration[l].neighbour_mnc_digit_length       = *NeighbourCellParamList.paramarray[l][GNB_CONFIG_N_CELL_MNC_DIGIT_LENGTH_IDX].uptr;
+          rrc->neighbourConfiguration[l].neighbour_tac                    = *NeighbourCellParamList.paramarray[l][GNB_CONFIG_N_CELL_TAC_IDX].uptr;
+        }
+
+        rrc->number_of_neighbours = NeighbourCellParamList.numelt;
+
+        if (rrc->number_of_neighbours > 0) {
+          paramdef_t MeasurementEventParams[] = MEASUREMENT_EVENTS_GLOBALPARAMS_DESC;
+          paramlist_def_t MeasurementEventParamList = {GNB_CONFIG_STRING_MEASUREMENT_EVENTS, NULL, 0};
+          config_getlist(config_get_if(), &MeasurementEventParamList, MeasurementEventParams, sizeofArray(MeasurementEventParams), gnbpath);
+          
+          rrc->measurementConfiguration.enableA2 = (*MeasurementEventParamList.paramarray[0][MEASUREMENT_EVENTS_ENABLE_A2_IDX].i64ptr);
+          if (rrc->measurementConfiguration.enableA2) {
+            rrc->measurementConfiguration.a2_threshold = *MeasurementEventParamList.paramarray[0][MEASUREMENT_EVENTS_ENABLE_A2_THRESHOLD_IDX].i64ptr;    
+            rrc->measurementConfiguration.a2_time_to_trigger = *MeasurementEventParamList.paramarray[0][MEASUREMENT_EVENTS_ENABLE_A2_TIME_TO_TRIGGER_IDX].i64ptr;              
+          }
+          
+          rrc->measurementConfiguration.enableA3 = (*MeasurementEventParamList.paramarray[0][MEASUREMENT_EVENTS_ENABLE_A3_IDX].i64ptr);    
+          if (rrc->measurementConfiguration.enableA3) {
+            rrc->measurementConfiguration.a3_offset = *MeasurementEventParamList.paramarray[0][MEASUREMENT_EVENTS_ENABLE_A3_OFFSET_IDX].i64ptr;    
+            rrc->measurementConfiguration.a3_hysteresis = *MeasurementEventParamList.paramarray[0][MEASUREMENT_EVENTS_ENABLE_A3_HYSTERESIS_IDX].i64ptr;    
+            rrc->measurementConfiguration.a3_time_to_trigger = *MeasurementEventParamList.paramarray[0][MEASUREMENT_EVENTS_ENABLE_A3_TIME_TO_TRIGGER_IDX].i64ptr;
+          }
+        }
         
         paramdef_t PLMNParams[] = GNBPLMNPARAMS_DESC;
 

openair2/GNB_APP/gnb_paramdef.h

@@ -229,6 +229,73 @@ typedef enum {
 /*-------------------------------------------------------------------------------------------------------------------------------------------------*/
 /*-------------------------------------------------------------------------------------------------------------------------------------------------*/		  
 
+/* Neighbour Cell Configurations*/
+#define GNB_CONFIG_STRING_NEIGHBOUR_CELL_LIST                   "neighbour_cell_configuration"
+
+
+#define GNB_CONFIG_STRING_NEIGHBOUR_GNB_ID                      "neighbour_gNB_ID"
+#define GNB_CONFIG_STRING_NEIGHBOUR_NR_CELLID                   "neighbour_nr_cellid"    
+#define GNB_CONFIG_STRING_NEIGHBOUR_CELL_PHYSICAL_ID            "neighbour_physical_cellId"
+#define GNB_CONFIG_STRING_NEIGHBOUR_CELL_ABS_FREQ_SSB           "neighbour_absoluteFrequencySSB"
+#define GNB_CONFIG_STRING_NEIGHBOUR_CELL_SCS                    "neighbour_subcarrierSpacing"
+#define GNB_CONFIG_STRING_NEIGHBOUR_MOBILE_COUNTRY_CODE         "neighbour_mcc"
+#define GNB_CONFIG_STRING_NEIGHBOUR_MOBILE_NETWORK_CODE         "neighbour_mnc"
+#define GNB_CONFIG_STRING_NEIGHBOUR_MNC_DIGIT_LENGTH            "neighbour_mnc_length"
+#define GNB_CONFIG_STRING_NEIGHBOUR_TRACKING_ARE_CODE           "neighbour_tracking_area_code"
+
+
+
+#define GNB_CONFIG_N_CELL_GNB_ID_IDX                         0
+#define GNB_CONFIG_N_CELL_NR_CELLID_IDX                      1
+#define GNB_CONFIG_N_CELL_PHYSICAL_ID_IDX                    2
+#define GNB_CONFIG_N_CELL_ABS_FREQ_SSB_IDX                   3
+#define GNB_CONFIG_N_CELL_SCS_IDX                            4
+#define GNB_CONFIG_N_CELL_MCC_IDX                            5
+#define GNB_CONFIG_N_CELL_MNC_IDX                            6
+#define GNB_CONFIG_N_CELL_MNC_DIGIT_LENGTH_IDX               7
+#define GNB_CONFIG_N_CELL_TAC_IDX                            8
+
+#define GNBNEIGHBOURCELLPARAMS_DESC {                                                                  \
+/*   optname                                                  helpstr                       paramflags  XXXptr     def val          type    numelt */ \
+  {GNB_CONFIG_STRING_GNB_ID,                                NULL,                                    0,           .uptr=NULL,   .defintval=0,                 TYPE_UINT,      0},    \
+  {GNB_CONFIG_STRING_NRCELLID,                              NULL,                                    0,           .u64ptr=NULL, .defint64val=1,               TYPE_UINT64,    0},    \
+  {GNB_CONFIG_STRING_NEIGHBOUR_CELL_PHYSICAL_ID,            "neighbour cell physical id",            0,           .uptr=NULL,   .defuintval=1000,             TYPE_UINT,      0},    \
+  {GNB_CONFIG_STRING_NEIGHBOUR_CELL_ABS_FREQ_SSB,           "neighbour cell abs freq ssb",           0,           .i64ptr=NULL, .defint64val=621312,          TYPE_INT64,     0},    \
+  {GNB_CONFIG_STRING_NEIGHBOUR_CELL_SCS,                    "neighbour cell scs",                    0,           .uptr=NULL,   .defuintval=1,                TYPE_UINT,      0},    \
+  {GNB_CONFIG_STRING_NEIGHBOUR_MOBILE_COUNTRY_CODE,         "mobile country code",                   0,           .uptr=NULL,   .defuintval=1000,             TYPE_UINT,      0},    \
+  {GNB_CONFIG_STRING_NEIGHBOUR_MOBILE_NETWORK_CODE,         "mobile network code",                   0,           .uptr=NULL,   .defuintval=1000,             TYPE_UINT,      0},    \
+  {GNB_CONFIG_STRING_NEIGHBOUR_MNC_DIGIT_LENGTH,            "length of the MNC (2 or 3)",            0,           .uptr=NULL,   .defuintval=0,                TYPE_UINT,      0},    \
+  {GNB_CONFIG_STRING_NEIGHBOUR_TRACKING_ARE_CODE,           NULL,                                    0,           .uptr=NULL,   .defuintval=0,                TYPE_UINT,      0},  \
+}
+
+/* Measurement Event Configurations*/
+#define GNB_CONFIG_STRING_MEASUREMENT_EVENTS              "nr_measurement_event_configuration"
+
+#define MEASUREMENT_EVENTS_ENABLE_A2                      "enableA2"
+#define MEASUREMENT_EVENTS_ENABLE_A3                      "enableA3"
+#define MEASUREMENT_EVENTS_ENABLE_A2_THRESHOLD            "thresholdA2"
+#define MEASUREMENT_EVENTS_ENABLE_A2_TIME_TO_TRIGGER      "A2_timeToTrigger"
+#define MEASUREMENT_EVENTS_ENABLE_A3_OFFSET               "A3_offset"
+#define MEASUREMENT_EVENTS_ENABLE_A3_HYSTERESIS           "A3_hysteresis"
+#define MEASUREMENT_EVENTS_ENABLE_A3_TIME_TO_TRIGGER      "A3_timeToTrigger"
+#define MEASUREMENT_EVENTS_GLOBALPARAMS_DESC { \
+    {MEASUREMENT_EVENTS_ENABLE_A2,                     "enabling a2 event",                       0,               .iptr=NULL,         .defintval=0,       TYPE_INT,  0},    \
+    {MEASUREMENT_EVENTS_ENABLE_A3,                     "enabling a3 event",                       0,               .iptr=NULL,         .defintval=0,       TYPE_INT,  0},    \
+    {MEASUREMENT_EVENTS_ENABLE_A2_THRESHOLD,           "a2 threshold",                            0,               .i64ptr=NULL,         .defint64val=30,      TYPE_INT64,  0},    \
+    {MEASUREMENT_EVENTS_ENABLE_A2_TIME_TO_TRIGGER,     "a2 time to trigger",                      0,               .i64ptr=NULL,         .defint64val=1,       TYPE_INT64,  0},    \
+    {MEASUREMENT_EVENTS_ENABLE_A3_OFFSET,              "a3 offset",                               0,               .i64ptr=NULL,         .defint64val=10,      TYPE_INT64,  0},    \
+    {MEASUREMENT_EVENTS_ENABLE_A3_HYSTERESIS,          "a3 hysteresis",                           0,               .i64ptr=NULL,         .defint64val=0,       TYPE_INT64,  0},    \
+    {MEASUREMENT_EVENTS_ENABLE_A3_TIME_TO_TRIGGER,     "a3 time to trigger",                      0,               .i64ptr=NULL,         .defint64val=1,       TYPE_INT64,  0},    \
+}
+
+#define MEASUREMENT_EVENTS_ENABLE_A2_IDX                    0
+#define MEASUREMENT_EVENTS_ENABLE_A3_IDX                    1
+#define MEASUREMENT_EVENTS_ENABLE_A2_THRESHOLD_IDX          2
+#define MEASUREMENT_EVENTS_ENABLE_A2_TIME_TO_TRIGGER_IDX    3
+#define MEASUREMENT_EVENTS_ENABLE_A3_OFFSET_IDX             4
+#define MEASUREMENT_EVENTS_ENABLE_A3_HYSTERESIS_IDX         5
+#define MEASUREMENT_EVENTS_ENABLE_A3_TIME_TO_TRIGGER_IDX    6
+
 /* PLMN ID configuration */
 
 #define GNB_CONFIG_STRING_PLMN_LIST                     "plmn_list"

openair2/RRC/NR/MESSAGES/asn1_msg.c

@@ -1183,6 +1183,149 @@ NR_MeasConfig_t *get_defaultMeasConfig(uint32_t ssb_arfcn, int band, int scs)
   return mc;
 }
 
+
+NR_MeasConfig_t *get_EventBasedMeasConfig(uint32_t ssb_arfcn, int band, int scs, const nr_measurement_event_configuration_t* measurementConfiguration, nr_neighbour_gnb_configuration_t* neighbourConfiguration, const int numberOfNeighbours){
+
+  bool intraFrequencyNeighbourExists = false;
+  LOG_D(NR_RRC, "HO LOG: Supports only Intra Frequency Meas with SCS:%d ABS ARFCN: %d\n", scs, ssb_arfcn);
+  for (uint8_t nCell = 0; nCell < numberOfNeighbours; nCell++){
+    nr_neighbour_gnb_configuration_t* neighbourCell = &neighbourConfiguration[nCell];
+    if (ssb_arfcn == neighbourCell->absoluteFrequencySSB && scs == neighbourCell->subcarrierSpacing) {
+          LOG_D(NR_RRC, "HO LOG: Intra Frequency Neighbour is Found!\n");
+          intraFrequencyNeighbourExists = true;
+          neighbourCell->intraFrequencyNeighbour = true;
+        }
+  }
+
+  if (!intraFrequencyNeighbourExists){
+      LOG_E(NR_RRC, "HO LOG: Currently Inter Frequency Measurements are not supported!\n");
+      return NULL;
+  }  
+  
+  NR_MeasConfig_t *mc = calloc(1, sizeof(*mc));
+  mc->measObjectToAddModList = calloc(1, sizeof(*mc->measObjectToAddModList));
+  mc->reportConfigToAddModList = calloc(1, sizeof(*mc->reportConfigToAddModList));
+
+  //A3 Configuration  
+  NR_MeasObjectToAddMod_t *mo1 = calloc(1, sizeof(*mo1));
+  mo1->measObjectId = 1;
+  mo1->measObject.present = NR_MeasObjectToAddMod__measObject_PR_measObjectNR;
+  NR_MeasObjectNR_t *monr1 = calloc(1, sizeof(*monr1));
+  asn1cCallocOne(monr1->ssbFrequency, ssb_arfcn);
+  asn1cCallocOne(monr1->ssbSubcarrierSpacing, scs);
+  monr1->referenceSignalConfig.ssb_ConfigMobility = calloc(1, sizeof(*monr1->referenceSignalConfig.ssb_ConfigMobility));
+  monr1->referenceSignalConfig.ssb_ConfigMobility->deriveSSB_IndexFromCell = true;
+  monr1->absThreshSS_BlocksConsolidation = calloc(1, sizeof(*monr1->absThreshSS_BlocksConsolidation));
+  asn1cCallocOne(monr1->absThreshSS_BlocksConsolidation->thresholdRSRP, 36);
+  asn1cCallocOne(monr1->nrofSS_BlocksToAverage, 8);
+  monr1->smtc1 = calloc(1, sizeof(*monr1->smtc1));
+  monr1->smtc1->periodicityAndOffset.present = NR_SSB_MTC__periodicityAndOffset_PR_sf20;
+  monr1->smtc1->periodicityAndOffset.choice.sf20 = 2;
+  monr1->smtc1->duration = NR_SSB_MTC__duration_sf2;
+  monr1->quantityConfigIndex = 1;
+  monr1->ext1 = calloc(1, sizeof(*monr1->ext1));
+  asn1cCallocOne(monr1->ext1->freqBandIndicatorNR, band);
+
+  
+  for (uint8_t nCell = 0; nCell < numberOfNeighbours; nCell++){
+    const nr_neighbour_gnb_configuration_t* neighbourCell = &neighbourConfiguration[nCell];
+    if (!neighbourCell->intraFrequencyNeighbour)
+      continue;
+
+    LOG_D(NR_RRC, "HO LOG: Preparing Meas Config for neighbour Cell with the ID: %d\n", neighbourCell->physicalCellId);
+    if (monr1->cellsToAddModList == NULL) {
+      monr1->cellsToAddModList = calloc(1, sizeof(*monr1->cellsToAddModList));
+    }
+
+    NR_CellsToAddMod_t *cell = calloc(1, sizeof(*cell));
+    cell->physCellId = neighbourCell->physicalCellId;
+    ASN_SEQUENCE_ADD(&monr1->cellsToAddModList->list, cell);    
+  }
+  const int numIntraFreqNeighbours = monr1->cellsToAddModList->list.count;
+  mo1->measObject.choice.measObjectNR = monr1;
+  asn1cSeqAdd(&mc->measObjectToAddModList->list, mo1);
+  
+  NR_ReportConfigToAddMod_t *rc_A3 = calloc(1, sizeof(*rc_A3));
+  rc_A3->reportConfigId = 1;
+  rc_A3->reportConfig.present = NR_ReportConfigToAddMod__reportConfig_PR_reportConfigNR;
+  NR_EventTriggerConfig_t *etrc_A3 = calloc(1, sizeof(*etrc_A3));
+  etrc_A3->eventId.present = NR_EventTriggerConfig__eventId_PR_eventA3;
+  etrc_A3->eventId.choice.eventA3 = calloc(1, sizeof(*etrc_A3->eventId.choice.eventA3));
+  etrc_A3->eventId.choice.eventA3->a3_Offset.present = NR_MeasTriggerQuantityOffset_PR_rsrp;
+  etrc_A3->eventId.choice.eventA3->a3_Offset.choice.rsrp = measurementConfiguration->a3_offset;
+  etrc_A3->eventId.choice.eventA3->reportOnLeave = true;
+  etrc_A3->eventId.choice.eventA3->hysteresis = measurementConfiguration->a3_hysteresis; 
+  etrc_A3->eventId.choice.eventA3->timeToTrigger = measurementConfiguration->a3_time_to_trigger;
+  etrc_A3->rsType = NR_NR_RS_Type_ssb;
+  etrc_A3->reportInterval = NR_ReportInterval_ms1024;
+  etrc_A3->reportAmount = NR_EventTriggerConfig__reportAmount_r4;
+  etrc_A3->reportQuantityCell.rsrp = true;
+  etrc_A3->reportQuantityCell.rsrq = false;
+  etrc_A3->reportQuantityCell.sinr = true;
+  asn1cCallocOne(etrc_A3->maxNrofRS_IndexesToReport, 4);
+  etrc_A3->maxReportCells = numIntraFreqNeighbours;
+  etrc_A3->includeBeamMeasurements = false;
+  NR_ReportConfigNR_t *rcnr_A3 = calloc(1, sizeof(*rcnr_A3));
+  rcnr_A3->reportType.present = NR_ReportConfigNR__reportType_PR_eventTriggered;
+  rcnr_A3->reportType.choice.eventTriggered = etrc_A3;
+  rc_A3->reportConfig.choice.reportConfigNR = rcnr_A3;
+  asn1cSeqAdd(&mc->reportConfigToAddModList->list, rc_A3);
+
+  mc->measIdToAddModList = calloc(1, sizeof(*mc->measIdToAddModList));
+  NR_MeasIdToAddMod_t *measid_A3 = calloc(1, sizeof(*measid_A3));
+  measid_A3->measId = 1;
+  measid_A3->measObjectId = 1;
+  measid_A3->reportConfigId = 1;
+  asn1cSeqAdd(&mc->measIdToAddModList->list, measid_A3);
+
+
+  // A2 Report Configuration
+  if (measurementConfiguration->enableA2) {
+    LOG_D(NR_RRC, "HO LOG: Preparing A2 Event Measurement Configuration!\n");
+      NR_ReportConfigToAddMod_t *rc_A2 = calloc(1, sizeof(*rc_A2));
+      rc_A2->reportConfigId = 2;
+      rc_A2->reportConfig.present = NR_ReportConfigToAddMod__reportConfig_PR_reportConfigNR;
+      NR_EventTriggerConfig_t *etrc_A2 = calloc(1, sizeof(*etrc_A2));
+      etrc_A2->eventId.present = NR_EventTriggerConfig__eventId_PR_eventA2;
+      etrc_A2->eventId.choice.eventA2 = calloc(1, sizeof(*etrc_A2->eventId.choice.eventA2));
+      etrc_A2->eventId.choice.eventA2->a2_Threshold.present = NR_MeasTriggerQuantity_PR_rsrp;
+      etrc_A2->eventId.choice.eventA2->a2_Threshold.choice.rsrp = measurementConfiguration->a2_threshold;
+      etrc_A2->eventId.choice.eventA2->reportOnLeave = false;
+      etrc_A2->eventId.choice.eventA2->hysteresis = 0;
+      etrc_A2->eventId.choice.eventA2->timeToTrigger = measurementConfiguration->a2_time_to_trigger;
+      etrc_A2->rsType = NR_NR_RS_Type_ssb;
+      etrc_A2->reportInterval = NR_ReportInterval_ms480;
+      etrc_A2->reportAmount = NR_EventTriggerConfig__reportAmount_r4;
+      etrc_A2->reportQuantityCell.rsrp = true;
+      etrc_A2->reportQuantityCell.rsrq = false;
+      etrc_A2->reportQuantityCell.sinr = false;
+      asn1cCallocOne(etrc_A2->maxNrofRS_IndexesToReport, 4);
+      etrc_A2->maxReportCells = 1;
+      etrc_A2->includeBeamMeasurements = false;
+      NR_ReportConfigNR_t *rcnr_A2 = calloc(1, sizeof(*rcnr_A2));
+      rcnr_A2->reportType.present = NR_ReportConfigNR__reportType_PR_eventTriggered;
+      rcnr_A2->reportType.choice.eventTriggered = etrc_A2;
+      rc_A2->reportConfig.choice.reportConfigNR = rcnr_A2;
+      asn1cSeqAdd(&mc->reportConfigToAddModList->list, rc_A2);
+
+
+      NR_MeasIdToAddMod_t *measid_A2 = calloc(1, sizeof(*measid_A2));
+      measid_A2->measId = 2;
+      measid_A2->measObjectId = 1;
+      measid_A2->reportConfigId = 2;
+      asn1cSeqAdd(&mc->measIdToAddModList->list, measid_A2);
+ 
+  }
+  mc->quantityConfig = calloc(1, sizeof(*mc->quantityConfig));
+  mc->quantityConfig->quantityConfigNR_List = calloc(1, sizeof(*mc->quantityConfig->quantityConfigNR_List));
+  NR_QuantityConfigNR_t *qcnr3 = calloc(1, sizeof(*qcnr3));
+  asn1cCallocOne(qcnr3->quantityConfigCell.ssb_FilterConfig.filterCoefficientRSRP, NR_FilterCoefficient_fc6);
+  asn1cCallocOne(qcnr3->quantityConfigCell.csi_RS_FilterConfig.filterCoefficientRSRP, NR_FilterCoefficient_fc6);
+  asn1cSeqAdd(&mc->quantityConfig->quantityConfigNR_List->list, qcnr3);   
+  
+  return mc;
+}
+
 void free_defaultMeasConfig(NR_MeasConfig_t *mc)
 {
   ASN_STRUCT_FREE(asn_DEF_NR_MeasConfig, mc);

openair2/RRC/NR/MESSAGES/asn1_msg.h

@@ -143,6 +143,7 @@ int do_RRCReestablishment(rrc_gNB_ue_context_t *const ue_context_pP,
 int do_RRCReestablishmentComplete(uint8_t *buffer, size_t buffer_size, int64_t rrc_TransactionIdentifier);
 
 NR_MeasConfig_t *get_defaultMeasConfig(uint32_t absFreqSSB, int band, int scs);
+NR_MeasConfig_t *get_EventBasedMeasConfig(uint32_t ssb_arfcn, int band, int scs, const nr_measurement_event_configuration_t* measurementConfiguration, nr_neighbour_gnb_configuration_t* neighbourConfiguration, const int numberOfNeighbours);
 void free_defaultMeasConfig(NR_MeasConfig_t *mc);
 uint8_t do_NR_Paging(uint8_t Mod_id, uint8_t *buffer, uint32_t tmsi);
 

openair2/RRC/NR/nr_rrc_defs.h

@@ -96,6 +96,8 @@
 #define NR_UE_MODULE_INVALID ((module_id_t) ~0) // FIXME attention! depends on type uint8_t!!!
 #define NR_UE_INDEX_INVALID  ((module_id_t) ~0) // FIXME attention! depends on type uint8_t!!! used to be -1
 
+#define MAX_NUMBER_OF_NEIGHBOUR_GNBS 6
+
 typedef enum {
   NR_RRC_OK=0,
   NR_RRC_ConnSetup_failed,
@@ -343,6 +345,30 @@ typedef struct {
   int do_drb_integrity;
 } nr_security_configuration_t;
 
+
+typedef struct {
+  uint32_t neighbour_gNB_ID;
+  uint64_t neighbour_nrcell_id;
+  int physicalCellId;
+  int absoluteFrequencySSB;
+  int subcarrierSpacing;
+  uint16_t neighbour_mcc;
+  uint16_t neighbour_mnc;
+  uint8_t  neighbour_mnc_digit_length;
+  uint32_t neighbour_tac;
+  bool intraFrequencyNeighbour;
+} nr_neighbour_gnb_configuration_t;
+
+typedef struct {
+  int enableA2;
+  int enableA3;
+  int a2_threshold;
+  int a2_time_to_trigger;
+  int a3_offset;
+  int a3_hysteresis;
+  int a3_time_to_trigger;
+} nr_measurement_event_configuration_t;
+
 typedef struct nr_mac_rrc_dl_if_s {
   f1_setup_response_func_t f1_setup_response;
   f1_setup_failure_func_t f1_setup_failure;
@@ -405,6 +431,9 @@ typedef struct gNB_RRC_INST_s {
 
   nr_mac_rrc_dl_if_t mac_rrc;
   cucp_cuup_if_t cucp_cuup;
+  nr_neighbour_gnb_configuration_t neighbourConfiguration[MAX_NUMBER_OF_NEIGHBOUR_GNBS];
+  nr_measurement_event_configuration_t measurementConfiguration;
+  uint8_t number_of_neighbours;
 
   RB_HEAD(rrc_du_tree, nr_rrc_du_container_t) dus; // DUs, indexed by assoc_id
   size_t num_dus;

openair2/RRC/NR/rrc_gNB.c

@@ -510,6 +510,16 @@ static void rrc_gNB_process_RRCSetupComplete(const protocol_ctxt_t *const ctxt_p
 #endif
 }
 
+static void clone_MeasConfig(const NR_MeasConfig_t *orig, rrc_gNB_ue_context_t *ue_context_pP)
+{
+  uint8_t buf[16636];
+  asn_enc_rval_t enc_rval = uper_encode_to_buffer(&asn_DEF_NR_MeasConfig, NULL, orig, buf, sizeof(buf));
+  AssertFatal(enc_rval.encoded > 0, "could not clone Meas Config: problem while encoding\n");
+  asn_dec_rval_t dec_rval = uper_decode(NULL, &asn_DEF_NR_MeasConfig, (void **)&ue_context_pP->ue_context.measConfig, buf, enc_rval.encoded, 0, 0);
+  AssertFatal(dec_rval.code == RC_OK && dec_rval.consumed == enc_rval.encoded,
+              "could not clone NR_MeasConfig_t: problem while decodung\n");
+}
+
 //-----------------------------------------------------------------------------
 static void rrc_gNB_generate_defaultRRCReconfiguration(const protocol_ctxt_t *const ctxt_pP, rrc_gNB_ue_context_t *ue_context_pP)
 //-----------------------------------------------------------------------------
@@ -555,8 +565,23 @@ static void rrc_gNB_generate_defaultRRCReconfiguration(const protocol_ctxt_t *co
     /* we cannot calculate the default measurement config without MIB&SIB1, as
      * we don't know the DU's SSB ARFCN */
     uint32_t ssb_arfcn = get_ssb_arfcn(cell_info, du->mib, du->sib1);
+    if (rrc->measurementConfiguration.enableA3 && rrc->number_of_neighbours > 0) {
+      LOG_D(NR_RRC, "HO LOG: Event Based Measurement is Selected!\n");
+      measconfig = get_EventBasedMeasConfig(ssb_arfcn, band, scs, &(rrc->measurementConfiguration), rrc->neighbourConfiguration, rrc->number_of_neighbours);
+    } else{
       measconfig = get_defaultMeasConfig(ssb_arfcn, band, scs);
     }
+  }
+
+  
+  if (ue_p->measConfig != NULL) {
+    free(ue_p->measConfig);
+    ue_p->measConfig = NULL;
+  }
+  
+  if (measconfig != NULL)
+    clone_MeasConfig(measconfig, ue_context_pP);
+      
   NR_SRB_ToAddModList_t *SRBs = createSRBlist(ue_p, false);
   NR_DRB_ToAddModList_t *DRBs = createDRBlist(ue_p, false);
     
@@ -1204,13 +1229,54 @@ fallback_rrc_setup:
 
 static void rrc_gNB_process_MeasurementReport(rrc_gNB_ue_context_t *ue_context, NR_MeasurementReport_t *measurementReport)
 {
+  LOG_D(NR_RRC, "Process Measurement Report\n");
   if (LOG_DEBUGFLAG(DEBUG_ASN1))
     xer_fprint(stdout, &asn_DEF_NR_MeasurementReport, (void *)measurementReport);
 
+
   DevAssert(measurementReport->criticalExtensions.present == NR_MeasurementReport__criticalExtensions_PR_measurementReport
             && measurementReport->criticalExtensions.choice.measurementReport != NULL);
 
   gNB_RRC_UE_t *ue_ctxt = &ue_context->ue_context; 
+  NR_MeasConfig_t *meas_config = ue_ctxt->measConfig;
+  if (meas_config == NULL) {
+    LOG_E(NR_RRC, "%s: %i - meas_config = %p\n", __FUNCTION__, __LINE__, meas_config);
+    return;
+  }
+  // xer_fprint(stdout, &asn_DEF_NR_MeasurementReport, (void *)measurementReport);
+  // xer_fprint(stdout, &asn_DEF_NR_MeasConfig, (void*)ue_ctxt->measConfig);
+  NR_MeasurementReport_IEs_t *measurementReport_IEs = measurementReport->criticalExtensions.choice.measurementReport;
+  const NR_MeasId_t measId = measurementReport_IEs->measResults.measId;
+
+  NR_MeasIdToAddMod_t *meas_id_s = NULL;
+  for (int meas_idx = 0; meas_idx < meas_config->measIdToAddModList->list.count; meas_idx++) {
+    if (measId == meas_config->measIdToAddModList->list.array[meas_idx]->measId) {
+      meas_id_s = meas_config->measIdToAddModList->list.array[meas_idx];
+      break;
+    }
+  }
+
+  if (meas_id_s == NULL){
+    LOG_E(NR_RRC, "Incoming Meas ID with id: %d Can not Found!\n", (int)measId);
+    return;
+  }
+
+  LOG_D(NR_RRC, "HO LOG: Meas Id is found: %d\n", (int)meas_id_s->measId);
+
+  struct NR_ReportConfigToAddMod__reportConfig *report_config = NULL;
+  for (int rep_id = 0; rep_id < meas_config->reportConfigToAddModList->list.count; rep_id++) {
+    if (meas_id_s->reportConfigId == meas_config->reportConfigToAddModList->list.array[rep_id]->reportConfigId) {
+      report_config = &meas_config->reportConfigToAddModList->list.array[rep_id]->reportConfig;
+    }
+  }
+
+  if (report_config == NULL) {
+    LOG_E(NR_RRC, "There is no related report configuration for this measId!\n");
+    return;
+  }
+
+  if (report_config->choice.reportConfigNR->reportType.present == NR_ReportConfigNR__reportType_PR_periodical){
+    LOG_I(NR_RRC, "Periodical Event Report! Do Nothing for now...\n");
     ASN_STRUCT_FREE(asn_DEF_NR_MeasResults, ue_ctxt->measResults);
     ue_ctxt->measResults = NULL;
 
@@ -1220,6 +1286,63 @@ static void rrc_gNB_process_MeasurementReport(rrc_gNB_ue_context_t *ue_context,
     /* we "keep" the measurement report, so set to 0 */
     free(measurementReport->criticalExtensions.choice.measurementReport);
     measurementReport->criticalExtensions.choice.measurementReport = NULL;
+    return;
+  }
+    
+  if (report_config->choice.reportConfigNR->reportType.present != NR_ReportConfigNR__reportType_PR_eventTriggered){
+    LOG_D(NR_RRC, "Incoming Report Type: %d is not supported! \n", report_config->choice.reportConfigNR->reportType.present);
+    return;
+  }
+
+  NR_EventTriggerConfig_t *event_triggered = report_config->choice.reportConfigNR->reportType.choice.eventTriggered;
+  LOG_I(NR_RRC, "HO LOG: Incoming Report Id: %d\n", (int)measId);
+
+
+  int servingCellRSRP = 0;
+  int neighbourCellRSRP = 0;
+
+  switch (event_triggered->eventId.present) {
+    case NR_EventTriggerConfig__eventId_PR_eventA2:
+      LOG_I(NR_RRC, "\nHO LOG: Event A2 (Serving becomes worse than threshold)\n");
+      break;
+
+    case NR_EventTriggerConfig__eventId_PR_eventA3:
+    {
+      LOG_I(NR_RRC, "\nHO LOG: Event A3 Report - Neighbour Becomes Better than Serving!\n");
+      for (int serving_cell_idx = 0; serving_cell_idx < measurementReport->criticalExtensions.choice.measurementReport->measResults.measResultServingMOList.list.count; serving_cell_idx++) {
+        const NR_MeasResultServMO_t* meas_result_serv_MO = measurementReport->criticalExtensions.choice.measurementReport->measResults.measResultServingMOList.list.array[serving_cell_idx];
+        
+        if (meas_result_serv_MO->measResultServingCell.measResult.cellResults.resultsSSB_Cell) {
+          servingCellRSRP =  *(meas_result_serv_MO->measResultServingCell.measResult.cellResults.resultsSSB_Cell->rsrp) - 157;
+        } else {
+          servingCellRSRP =  *(meas_result_serv_MO->measResultServingCell.measResult.cellResults.resultsCSI_RS_Cell->rsrp) - 157;
+        }
+        LOG_D(NR_RRC, "Serving Cell RSRP: %d\n", servingCellRSRP);
+      }
+      //Only Meas Result NR is supported at the moment
+      if (measurementReport->criticalExtensions.choice.measurementReport->measResults.measResultNeighCells == NULL)
+        break;
+
+      if (measurementReport->criticalExtensions.choice.measurementReport->measResults.measResultNeighCells->present != NR_MeasResults__measResultNeighCells_PR_measResultListNR)
+        break;
+
+      for (int neigh_meas_idx = 0; neigh_meas_idx < measurementReport->criticalExtensions.choice.measurementReport->measResults.measResultNeighCells->choice.measResultListNR->list.count; neigh_meas_idx++){
+        const NR_MeasResultNR_t* meas_result_neigh_cell = (measurementReport->criticalExtensions.choice.measurementReport->measResults.measResultNeighCells->choice.measResultListNR->list.array[neigh_meas_idx]);
+        const int neighbourCellId = *(meas_result_neigh_cell->physCellId);
+        if (meas_result_neigh_cell->measResult.cellResults.resultsSSB_Cell) {
+          neighbourCellRSRP =  *(meas_result_neigh_cell->measResult.cellResults.resultsSSB_Cell->rsrp) - 157;
+        } else {
+          neighbourCellRSRP =  *(meas_result_neigh_cell->measResult.cellResults.resultsCSI_RS_Cell->rsrp) - 157;
+        }
+        LOG_I(NR_RRC, "HO LOG: Measurement Report has came for the neighbour: %d with RSRP: %d\n", neighbourCellId, neighbourCellRSRP);
+      }
+
+    }
+      break;
+    default:
+      LOG_D(NR_RRC, "NR_EventTriggerConfig__eventId_PR_NOTHING or Other event report\n");
+      break;
+  }  
 }
 
 static int handle_rrcReestablishmentComplete(const protocol_ctxt_t *const ctxt_pP,