improve sib1 code for aggregation levels

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.c

@@ -4015,7 +4015,7 @@ void fill_coresetZero(NR_ControlResourceSet_t *coreset0, NR_Type0_PDCCH_CSS_conf
 
 }
 
-uint8_t fill_searchSpaceZero(NR_SearchSpace_t *ss0, NR_Type0_PDCCH_CSS_config_t *type0_PDCCH_CSS_config, int L) {
+void fill_searchSpaceZero(NR_SearchSpace_t *ss0, NR_Type0_PDCCH_CSS_config_t *type0_PDCCH_CSS_config) {
 
   if(ss0 == NULL) ss0=calloc(1,sizeof(*ss0));
   if(ss0->controlResourceSetId == NULL) ss0->controlResourceSetId=calloc(1,sizeof(*ss0->controlResourceSetId));
@@ -4033,7 +4033,6 @@ uint8_t fill_searchSpaceZero(NR_SearchSpace_t *ss0, NR_Type0_PDCCH_CSS_config_t
   AssertFatal(type0_PDCCH_CSS_config!=NULL,"No type0 CSS configuration\n");
 
   max_agg = (type0_PDCCH_CSS_config->num_symbols*type0_PDCCH_CSS_config->num_rbs)/6;
-  if (L>max_agg) return 0;
 
   symbols = (1-(1<<type0_PDCCH_CSS_config->num_symbols))<<type0_PDCCH_CSS_config->first_symbol_index;
   duration = type0_PDCCH_CSS_config->search_space_duration;
@@ -4066,28 +4065,11 @@ uint8_t fill_searchSpaceZero(NR_SearchSpace_t *ss0, NR_Type0_PDCCH_CSS_config_t
   // max values are set according to TS38.213 Section 10.1 Table 10.1-1
   ss0->nrofCandidates->aggregationLevel1 = NR_SearchSpace__nrofCandidates__aggregationLevel1_n0;
   ss0->nrofCandidates->aggregationLevel2 = NR_SearchSpace__nrofCandidates__aggregationLevel2_n0;
-  switch(L){
-    case 4:
   ss0->nrofCandidates->aggregationLevel4 = (((max_agg>>2) > 4)? 4 : max_agg>>2);
-      ss0->nrofCandidates->aggregationLevel8 = NR_SearchSpace__nrofCandidates__aggregationLevel8_n0;
-      ss0->nrofCandidates->aggregationLevel16 = NR_SearchSpace__nrofCandidates__aggregationLevel16_n0;
-      break;
-    case 8:
-      ss0->nrofCandidates->aggregationLevel4 = NR_SearchSpace__nrofCandidates__aggregationLevel4_n0;
   ss0->nrofCandidates->aggregationLevel8 = (((max_agg>>3) > 2)? 2 : max_agg>>3);
-      ss0->nrofCandidates->aggregationLevel16 = NR_SearchSpace__nrofCandidates__aggregationLevel16_n0;
-      break;
-    case 16:
-      ss0->nrofCandidates->aggregationLevel4 = NR_SearchSpace__nrofCandidates__aggregationLevel4_n0;
-      ss0->nrofCandidates->aggregationLevel8 = NR_SearchSpace__nrofCandidates__aggregationLevel8_n0;
   ss0->nrofCandidates->aggregationLevel16 = (((max_agg>>4) > 1)? 1 : max_agg>>4);
-      break;
-  default:
-    AssertFatal(1==0,"Invalid aggregation level %d for SS0\n",L);
-  }
 
   ss0->searchSpaceType->present = NR_SearchSpace__searchSpaceType_PR_common;
-  return 1;
 }
 
 

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.h

@@ -150,7 +150,7 @@ void get_info_from_tda_tables(int default_abc,
                               int *nrOfSymbols);
 
 void fill_coresetZero(NR_ControlResourceSet_t *coreset0, NR_Type0_PDCCH_CSS_config_t *type0_PDCCH_CSS_config);
-uint8_t fill_searchSpaceZero(NR_SearchSpace_t *ss0, NR_Type0_PDCCH_CSS_config_t *type0_PDCCH_CSS_config, int L);
+void fill_searchSpaceZero(NR_SearchSpace_t *ss0, NR_Type0_PDCCH_CSS_config_t *type0_PDCCH_CSS_config);
 
 uint16_t compute_pucch_prb_size(uint8_t format,
                                 uint8_t nr_prbs,

openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c

@@ -2000,11 +2000,8 @@ void nr_ue_sib1_scheduler(module_id_t module_idP,
   if(mac->search_space_zero == NULL) mac->search_space_zero=calloc(1,sizeof(*mac->search_space_zero));
   if(mac->coreset0 == NULL) mac->coreset0 = calloc(1,sizeof(*mac->coreset0));
 
-  for (int i=0; i<3; i++) { // loop over possible aggregation levels
-
   fill_coresetZero(mac->coreset0, &mac->type0_PDCCH_CSS_config);
-    ret = fill_searchSpaceZero(mac->search_space_zero, &mac->type0_PDCCH_CSS_config,4<<i);
-    if (ret) {
+  fill_searchSpaceZero(mac->search_space_zero, &mac->type0_PDCCH_CSS_config,4<<i);
   rel15 = &dl_config->dl_config_list[dl_config->number_pdus].dci_config_pdu.dci_config_rel15;
   rel15->num_dci_options = 1;
   rel15->dci_format_options[0] = NR_DL_DCI_FORMAT_1_0;
@@ -2025,8 +2022,7 @@ void nr_ue_sib1_scheduler(module_id_t module_idP,
   }
   LOG_D(MAC,"Calling fill_scheduled_response, type0_pdcch, num_pdus %d\n",dl_config->number_pdus);
   fill_scheduled_response(&scheduled_response, dl_config, NULL, NULL, module_idP, cc_id, frame_s, slot_s, 0); // TODO fix thread_id, for now assumed 0
-    }
-  }
+
   if (dl_config->number_pdus) {
     if(mac->if_module != NULL && mac->if_module->scheduled_response != NULL)
       mac->if_module->scheduled_response(&scheduled_response);

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_bch.c

@@ -335,10 +335,7 @@ uint32_t schedule_control_sib1(module_id_t module_id,
     gNB_mac->sched_ctrlCommon = calloc(1,sizeof(*gNB_mac->sched_ctrlCommon));
     gNB_mac->sched_ctrlCommon->search_space = calloc(1,sizeof(*gNB_mac->sched_ctrlCommon->search_space));
     gNB_mac->sched_ctrlCommon->coreset = calloc(1,sizeof(*gNB_mac->sched_ctrlCommon->coreset));
-    for (int i=0; i<3; i++){ // loop over possible aggregation levels
-      ret = fill_searchSpaceZero(gNB_mac->sched_ctrlCommon->search_space,type0_PDCCH_CSS_config,4<<i);
-      if (ret == 1) break;
-    }
+    ret = fill_searchSpaceZero(gNB_mac->sched_ctrlCommon->search_space,type0_PDCCH_CSS_config);
     AssertFatal(ret==1,"No aggregation level for type0_PDCCH_CSS found\n");
     fill_coresetZero(gNB_mac->sched_ctrlCommon->coreset,type0_PDCCH_CSS_config);
   }
@@ -349,7 +346,11 @@ uint32_t schedule_control_sib1(module_id_t module_id,
   gNB_mac->sched_ctrlCommon->num_total_bytes = num_total_bytes;
 
   uint8_t nr_of_candidates;
-  find_aggregation_candidates(&gNB_mac->sched_ctrlCommon->aggregation_level, &nr_of_candidates, gNB_mac->sched_ctrlCommon->search_space,4);
+
+  for (int i=0; i<3; i++) {
+    find_aggregation_candidates(&gNB_mac->sched_ctrlCommon->aggregation_level, &nr_of_candidates, gNB_mac->sched_ctrlCommon->search_space,4<<i);
+    if (nr_of_candidates>0) break; // choosing the lower value of aggregation level available
+  }
   AssertFatal(nr_of_candidates>0,"nr_of_candidates is 0\n");
   gNB_mac->sched_ctrlCommon->cce_index = allocate_nr_CCEs(RC.nrmac[module_id],
                                                           NULL,