adapting msg2&3 scheduling to FR2 beamforming constraints

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c

@@ -359,10 +359,23 @@ void nr_schedule_msg2(uint16_t rach_frame, uint16_t rach_slot,
   if ((scc->tdd_UL_DL_ConfigurationCommon->pattern1.nrofDownlinkSymbols > 0) || (scc->tdd_UL_DL_ConfigurationCommon->pattern1.nrofUplinkSymbols > 0))
     tdd_period_slot++;
 
+
   // computing start of next period
-  uint8_t start_next_period = (rach_slot-(rach_slot%tdd_period_slot)+tdd_period_slot)%nr_slots_per_frame[mu];
+  int FR = *scc->downlinkConfigCommon->frequencyInfoDL->frequencyBandList.list.array[0] >= 257 ? nr_FR2 : nr_FR1;
+  uint8_t start_next_period;
+
+  if (FR==nr_FR1) {
+    start_next_period = (rach_slot-(rach_slot%tdd_period_slot)+tdd_period_slot)%nr_slots_per_frame[mu];
     *msg2_slot = start_next_period + last_dl_slot_period; // initializing scheduling of slot to next mixed (or last dl) slot
     *msg2_frame = (*msg2_slot>(rach_slot))? rach_frame : (rach_frame +1);
+  }
+  else {
+    // in FR2 we need to wait till the second half frame for msg2 since all beams are taken in first half frame by SSBs
+    if (rach_slot<30) start_next_period = 40;
+    else start_next_period = 50;
+    *msg2_slot = start_next_period;
+    *msg2_frame = (*msg2_slot>(rach_slot))? rach_frame : (rach_frame +1);
+  }
  
   switch(response_window){
     case NR_RACH_ConfigGeneric__ra_ResponseWindow_sl1:

targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band261.tm1.32PRB.usrpn300.conf

@@ -135,6 +135,9 @@ gNBs =
         # this is SS=0 L=12
         initialULBWPstartSymbolAndLength_1    = 69;
 
+        initialULBWPk2_2                      = 4;
+        initialULBWPmappingType_2             = 1;
+        initialULBWPstartSymbolAndLength_2    = 52;
 
         msg3_DeltaPreamble                                          = 1;
         p0_NominalWithGrant                                         =-90;