nr_dlsim: fix low-SNR performance by using DCI aggregation level 8

cmake_targets/autotests/test_case_list.xml

@@ -1134,7 +1134,7 @@
                   -n100 -s2 -U 2 1 3
                   -n10 -s20 -U 3 0 0 2 -gR -x1 -y4 -z4
                   -n10 -s20 -U 3 0 0 2 -gR -x2 -y4 -z4
-                  -n100 -e0 -t99 -S0.2 -i</main_exec_args>
+                  -n100 -e0 -t99 -S-1.4 -i</main_exec_args>
       <tags>nr_dlsim.test1 nr_dlsim.test2 nr_dlsim.test3 nr_dlsim.test4 nr_dlsim.test5 nr_dlsim.test6 nr_dlsim.test7 nr_dlsim.test8 nr_dlsim.test9 nr_dlsim.test10 nr_dlsim.test11 nr_dlsim.test12 nr_dlsim.test13 nr_dlsim.test14 nr_dlsim.test15 nr_dlsim.test16 nr_dlsim.test17 nr_dlsim.test18 nr_dlsim.test19 nr_dlsim.test20 nr_dlsim.test21 nr_dlsim.test22 nr_dlsim.test23</tags>
       <search_expr_true>PDSCH test OK</search_expr_true>
       <search_expr_false>segmentation fault|assertion|exiting|fatal</search_expr_false>

openair1/PHY/NR_UE_TRANSPORT/dci_nr.c

@@ -888,7 +888,7 @@ uint8_t nr_dci_decoding_procedure(PHY_VARS_NR_UE *ue,
               proc->frame_rx, proc->nr_slot_rx,n_rnti,nr_dci_format_string[rel15->dci_format_options[k]],CCEind,dci_length,*(unsigned long long*)dci_estimation);
         uint16_t mb = nr_dci_false_detection(dci_estimation,tmp_e,L*108,n_rnti, NR_POLAR_DCI_MESSAGE_TYPE, dci_length, L);
         ue->dci_thres = (ue->dci_thres + mb) / 2;
-        if (mb > (ue->dci_thres+20)) {
+        if (mb > (ue->dci_thres+30)) {
           LOG_W(PHY,"DCI false positive. Dropping DCI index %d. Mismatched bits: %d/%d. Current DCI threshold: %d\n",j,mb,L*108,ue->dci_thres);
           continue;
         }

openair1/SIMULATION/NR_PHY/dlsim.c

@@ -275,10 +275,17 @@ void nr_dlsim_preprocessor(module_id_t module_id,
   /* manually set free CCE to 0 */
   const int target_ss = NR_SearchSpace__searchSpaceType_PR_ue_Specific;
   sched_ctrl->search_space = get_searchspace(NULL, scc, sched_ctrl->active_bwp ? sched_ctrl->active_bwp->bwp_Dedicated : NULL, target_ss);
-  uint8_t nr_of_candidates;
+  uint8_t nr_of_candidates = 0;
+  if (g_mcsIndex < 4) {
+    find_aggregation_candidates(&sched_ctrl->aggregation_level,
+                                &nr_of_candidates,
+                                sched_ctrl->search_space,8);
+  }
+  if (nr_of_candidates == 0) {
     find_aggregation_candidates(&sched_ctrl->aggregation_level,
                                 &nr_of_candidates,
                                 sched_ctrl->search_space,4);
+  }
   sched_ctrl->coreset = get_coreset(module_id, scc, sched_ctrl->active_bwp->bwp_Dedicated, sched_ctrl->search_space, target_ss);
   sched_ctrl->cce_index = 0;
 

openair2/RRC/NR/rrc_gNB_reconfig.c

@@ -528,13 +528,16 @@ void fill_default_secondaryCellGroup(NR_ServingCellConfigCommon_t *servingcellco
  ss2->nrofCandidates=calloc(1,sizeof(*ss2->nrofCandidates));
  ss2->nrofCandidates->aggregationLevel1 = NR_SearchSpace__nrofCandidates__aggregationLevel1_n0;
  ss2->nrofCandidates->aggregationLevel2 = NR_SearchSpace__nrofCandidates__aggregationLevel2_n0;
- if (curr_bwp < 48)
+ if (curr_bwp < 48) {
    ss2->nrofCandidates->aggregationLevel4 = NR_SearchSpace__nrofCandidates__aggregationLevel4_n1;
- else if (curr_bwp < 96)
+   ss2->nrofCandidates->aggregationLevel8 = NR_SearchSpace__nrofCandidates__aggregationLevel8_n0;
+ } else if (curr_bwp < 96) {
    ss2->nrofCandidates->aggregationLevel4 = NR_SearchSpace__nrofCandidates__aggregationLevel4_n2;
- else
+   ss2->nrofCandidates->aggregationLevel8 = NR_SearchSpace__nrofCandidates__aggregationLevel8_n1;
+ } else {
    ss2->nrofCandidates->aggregationLevel4 = NR_SearchSpace__nrofCandidates__aggregationLevel4_n4;
- ss2->nrofCandidates->aggregationLevel8 = NR_SearchSpace__nrofCandidates__aggregationLevel8_n0;
+   ss2->nrofCandidates->aggregationLevel8 = NR_SearchSpace__nrofCandidates__aggregationLevel8_n2;
+ }
  ss2->nrofCandidates->aggregationLevel16 = NR_SearchSpace__nrofCandidates__aggregationLevel16_n0;
  ss2->searchSpaceType=calloc(1,sizeof(*ss2->searchSpaceType));
  ss2->searchSpaceType->present = NR_SearchSpace__searchSpaceType_PR_ue_Specific;