beam tdd association for ssb

openair2/LAYER2/NR_MAC_gNB/config.c

@@ -320,7 +320,7 @@ void config_common(int Mod_idP, int pdsch_AntennaPorts, NR_ServingCellConfigComm
       LOG_E(MAC,"TDD configuration can not be done\n");
     else {
       LOG_I(MAC,"TDD has been properly configurated\n");
-       RC.nrmac[Mod_idP]->tdd_beam_association = (uint8_t *)malloc16(periods_per_frame*sizeof(uint8_t));
+       RC.nrmac[Mod_idP]->tdd_beam_association = (int16_t *)malloc16(periods_per_frame*sizeof(int16_t));
     }
   }
 

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c

@@ -345,6 +345,12 @@ void gNB_dlsch_ulsch_scheduler(module_id_t module_idP,
       AssertFatal(1==0,"Undefined tdd period %ld\n", scc->tdd_UL_DL_ConfigurationCommon->pattern1.dl_UL_TransmissionPeriodicity);
   }
 
+  if (slot==0 && (*scc->downlinkConfigCommon->frequencyInfoDL->frequencyBandList.list.array[0]>=257)) {
+    // re-initialization of tdd_beam_association at beginning of frame (only for FR2)
+    for (int i=0; i<nb_periods_per_frame; i++)
+      gNB->tdd_beam_association[i] = -1;
+  }
+
   int num_slots_per_tdd = (nr_slots_per_frame[*scc->ssbSubcarrierSpacing])/nb_periods_per_frame;
 
   const int nr_ulmix_slots = tdd_pattern->nrofUplinkSlots + (tdd_pattern->nrofUplinkSymbols!=0);
@@ -386,7 +392,7 @@ void gNB_dlsch_ulsch_scheduler(module_id_t module_idP,
 
 
   // This schedules MIB
-  schedule_nr_mib(module_idP, frame, slot, nr_slots_per_frame[*scc->ssbSubcarrierSpacing]);
+  schedule_nr_mib(module_idP, frame, slot, nr_slots_per_frame[*scc->ssbSubcarrierSpacing],nb_periods_per_frame);
 
   // This schedule PRACH if we are not in phy_test mode
   if (get_softmodem_params()->phy_test == 0) {

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_bch.c

@@ -56,7 +56,11 @@
 extern RAN_CONTEXT_t RC;
 extern uint8_t SSB_Table[38];
 
-void schedule_nr_mib(module_id_t module_idP, frame_t frameP, sub_frame_t slotP, uint8_t slots_per_frame){
+void schedule_nr_mib(module_id_t module_idP,
+                     frame_t frameP,
+                     sub_frame_t slotP,
+                     uint8_t slots_per_frame,
+                     int nb_periods_per_frame){
 
   gNB_MAC_INST *gNB = RC.nrmac[module_idP];
   NR_COMMON_channels_t *cc;
@@ -68,6 +72,9 @@ void schedule_nr_mib(module_id_t module_idP, frame_t frameP, sub_frame_t slotP,
   int mib_sdu_length;
   int CC_id;
   uint8_t beam_index = 0;
+  // re-initializing the cumulative number of ssb transmitted
+  if (slotP==0)
+    gNB->cumul_ssb=0;
   
   for (CC_id = 0; CC_id < MAX_NUM_CCs; CC_id++) {
     cc = &gNB->common_channels[CC_id];
@@ -164,6 +171,7 @@ void schedule_nr_mib(module_id_t module_idP, frame_t frameP, sub_frame_t slotP,
     // checking if there is any SSB in slot
     const int abs_slot = (slots_per_frame * frameP) + slotP;
     const int slot_per_period = (slots_per_frame>>1)<<(*cc->ServingCellConfigCommon->ssb_periodicityServingCell);
+    const int num_tdd_period = slotP/(slots_per_frame/nb_periods_per_frame);
     int eff_120_slot;
     const BIT_STRING_t *shortBitmap = &cc->ServingCellConfigCommon->ssb_PositionsInBurst->choice.shortBitmap;
     const BIT_STRING_t *mediumBitmap = &cc->ServingCellConfigCommon->ssb_PositionsInBurst->choice.mediumBitmap;
@@ -211,8 +219,12 @@ void schedule_nr_mib(module_id_t module_idP, frame_t frameP, sub_frame_t slotP,
           else
             buf = longBitmap->buf[7];
         }
-        if ((eff_120_slot>=0) && (((buf >> (6 - (eff_120_slot << 1))) & 3) != 0))
+        if ((eff_120_slot>=0) && (((buf >> (6 - (eff_120_slot << 1))) & 3) != 0)) {
+          AssertFatal(((buf >> (6 - (eff_120_slot << 1))) & 3)<3,"We only support 1 ssb per slot max in FR2 for the moment\n");
+          gNB->tdd_beam_association[num_tdd_period] = gNB->cumul_ssb;
+          gNB->cumul_ssb++;
           fill_ssb_vrb_map(cc, ssb_offset0 / (ratio * 12) - 10, CC_id);
+        }
         break;
     default:
       AssertFatal(0,"SSB bitmap size value %d undefined (allowed values 1,2,3)\n",

openair2/LAYER2/NR_MAC_gNB/mac_proto.h

@@ -86,7 +86,11 @@ void nr_simple_dlsch_preprocessor(module_id_t module_id,
                                   sub_frame_t slot,
                                   int num_slots_per_tdd);
 
-void schedule_nr_mib(module_id_t module_idP, frame_t frameP, sub_frame_t subframeP, uint8_t slots_per_frame);
+void schedule_nr_mib(module_id_t module_idP,
+                     frame_t frameP,
+                     sub_frame_t subframeP,
+                     uint8_t slots_per_frame,
+                     int nb_periods_per_frame);
 
 /// uplink scheduler
 void nr_schedule_ulsch(module_id_t module_id,

openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h

@@ -548,7 +548,9 @@ typedef struct gNB_MAC_INST_s {
   /// CCE lists
   int cce_list[MAX_NUM_BWP][MAX_NUM_CORESET][MAX_NUM_CCE];
   /// list of allocated beams per period
-  uint8_t *tdd_beam_association;
+  int16_t *tdd_beam_association;
+  /// cumulative number of ssb transmitted
+  uint8_t cumul_ssb;
   /// DL preprocessor for differentiated scheduling
   nr_pp_impl_dl pre_processor_dl;
   /// UL preprocessor for differentiated scheduling