limiting the number of DCI candidates at UE according to available CCEs

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.c

@@ -4554,13 +4554,12 @@ void fill_searchSpaceZero(NR_SearchSpace_t *ss0,
     ss0->monitoringSymbolsWithinSlot->buf[0] |= ((symbols>>i)&0x01)<<(7-i);
   }
 
-  const uint16_t max_agg = (type0_PDCCH_CSS_config->num_symbols*type0_PDCCH_CSS_config->num_rbs)/6;
   // 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;
-  ss0->nrofCandidates->aggregationLevel4 = (((max_agg>>2) > 4)? 4 : max_agg>>2);
-  ss0->nrofCandidates->aggregationLevel8 = (((max_agg>>3) > 2)? 2 : max_agg>>3);
-  ss0->nrofCandidates->aggregationLevel16 = (((max_agg>>4) > 1)? 1 : max_agg>>4);
+  ss0->nrofCandidates->aggregationLevel4 = 4;
+  ss0->nrofCandidates->aggregationLevel8 = 2;
+  ss0->nrofCandidates->aggregationLevel16 = 1;
 
   ss0->searchSpaceType->present = NR_SearchSpace__searchSpaceType_PR_common;
 }

openair2/LAYER2/NR_MAC_UE/nr_ue_dci_configuration.c

@@ -56,7 +56,6 @@ void fill_dci_search_candidates(const NR_SearchSpace_t *ss,
                                 maxL);
     if (number_of_candidates > 0) {
       LOG_D(NR_MAC,"L %d, number of candidates %d, aggregation %d\n", maxL, number_of_candidates, aggregation);
-      rel15->number_of_candidates += number_of_candidates;
       int N_cce_sym = 0; // nb of rbs of coreset per symbol
       for (int f = 0; f < 6; f++) {
         for (int t = 0; t < 8; t++) {
@@ -64,9 +63,12 @@ void fill_dci_search_candidates(const NR_SearchSpace_t *ss,
         }
       }
       int N_cces = N_cce_sym * rel15->coreset.duration;
-      for (int j = 0; j < number_of_candidates; i++, j++) {
+      // limit the number of candidates to the ones fitting current configuration
+      int max_candidates = min(N_cces / aggregation, number_of_candidates);
+      rel15->number_of_candidates += max_candidates;
+      for (int j = 0; j < max_candidates; i++, j++) {
         int first_cce = aggregation * ((Y + ((j * N_cces) / (aggregation * number_of_candidates)) + 0) % (N_cces / aggregation));
-        LOG_D(NR_MAC,"Candidate %d of %d first_cce %d (L %d N_cces %d Y %d)\n", j, number_of_candidates, first_cce, aggregation, N_cces, Y);
+        LOG_D(NR_MAC,"Candidate %d of %d first_cce %d (L %d N_cces %d Y %d)\n", j, max_candidates, first_cce, aggregation, N_cces, Y);
         rel15->CCE[i] = first_cce;
         rel15->L[i] = aggregation;
       }

openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.c

@@ -1165,8 +1165,8 @@ int nr_ue_dl_indication(nr_downlink_indication_t *dl_info)
           continue;
         fapi_nr_dci_indication_pdu_t *dci_index = dl_info->dci_ind->dci_list+i;
 
-        /* The check below filters out UL_DCIs (format 7) which are being processed as DL_DCIs. */
-        if (dci_index->dci_format == 7 && mac->ra.ra_state == RA_SUCCEEDED) {
+        /* The check below filters out UL_DCIs which are being processed as DL_DCIs. */
+        if (dci_index->dci_format != NR_DL_DCI_FORMAT_1_0 && dci_index->dci_format != NR_DL_DCI_FORMAT_1_1) {
           LOG_D(NR_MAC, "We are filtering a UL_DCI to prevent it from being treated like a DL_DCI\n");
           continue;
         }