adding option for CSI slot

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_dlsch.c

@@ -58,10 +58,15 @@ const int get_dl_tda(const gNB_MAC_INST *nrmac, const NR_ServingCellConfigCommon
   const NR_TDD_UL_DL_Pattern_t *tdd = scc->tdd_UL_DL_ConfigurationCommon ? &scc->tdd_UL_DL_ConfigurationCommon->pattern1 : NULL;
   AssertFatal(tdd || nrmac->common_channels->frame_type == FDD, "Dynamic TDD not handled yet\n");
 
+  // Use special TDA in case of CSI-RS
+  const NR_UE_info_t *UE_info = &nrmac->UE_info;
+  if(UE_info->sched_csirs)
+      return 1;
+
   if (tdd && tdd->nrofDownlinkSymbols > 1) { // if there is a mixed slot where we can transmit DL
     const int nr_slots_period = tdd->nrofDownlinkSlots + tdd->nrofUplinkSlots + 1;
     if ((slot%nr_slots_period) == tdd->nrofDownlinkSlots)
-      return 1;
+      return 2;
   }
   return 0; // if FDD or not mixed slot in TDD, for now use default TDA (TODO handle CSI-RS slots)
 }

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_primitives.c

@@ -2659,6 +2659,8 @@ void nr_csirs_scheduling(int Mod_idP,
   gNB_MAC_INST *gNB_mac = RC.nrmac[Mod_idP];
   uint16_t *vrb_map = gNB_mac->common_channels[CC_id].vrb_map;
 
+  UE_info->sched_csirs = false;
+
   for (int UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id]) {
 
     NR_UE_sched_ctrl_t *sched_ctrl = &UE_info->UE_sched_ctrl[UE_id];
@@ -2691,6 +2693,7 @@ void nr_csirs_scheduling(int Mod_idP,
         if((frame*n_slots_frame+slot-offset)%period == 0) {
 
           LOG_D(NR_MAC,"Scheduling CSI-RS in frame %d slot %d\n",frame,slot);
+          UE_info->sched_csirs = true;
 
           nfapi_nr_dl_tti_request_pdu_t *dl_tti_csirs_pdu = &dl_req->dl_tti_pdu_list[dl_req->nPDUs];
           memset((void*)dl_tti_csirs_pdu,0,sizeof(nfapi_nr_dl_tti_request_pdu_t));

openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h

@@ -710,7 +710,8 @@ typedef struct {
   // UE selected beam index
   uint8_t UE_beam_index[MAX_MOBILES_PER_GNB];
   bool Msg4_ACKed[MAX_MOBILES_PER_GNB];
-
+  /// Sched CSI-RS: scheduling decisions
+  bool sched_csirs;
 } NR_UE_info_t;
 
 typedef void (*nr_pp_impl_dl)(module_id_t mod_id,

openair2/RRC/NR/nr_rrc_config.c

@@ -329,18 +329,20 @@ void nr_rrc_config_dl_tda(NR_ServingCellConfigCommon_t *scc,
   timedomainresourceallocation->mappingType = NR_PDSCH_TimeDomainResourceAllocation__mappingType_typeA;
   timedomainresourceallocation->startSymbolAndLength = get_SLIV(len_coreset,14-len_coreset); // basic slot configuration starting in symbol 1 til the end of the slot
   ASN_SEQUENCE_ADD(&pdsch_TimeDomainAllocationList->list, timedomainresourceallocation);
+  // setting TDA for CSI-RS symbol with index 1
+  struct NR_PDSCH_TimeDomainResourceAllocation *timedomainresourceallocation1 = CALLOC(1,sizeof(NR_PDSCH_TimeDomainResourceAllocation_t));
+  timedomainresourceallocation1->mappingType = NR_PDSCH_TimeDomainResourceAllocation__mappingType_typeA;
+  timedomainresourceallocation1->startSymbolAndLength = get_SLIV(len_coreset,14-len_coreset-1); // 1 symbol CSI-RS
+  ASN_SEQUENCE_ADD(&pdsch_TimeDomainAllocationList->list, timedomainresourceallocation1);
   if(frame_type==TDD) {
     if(scc->tdd_UL_DL_ConfigurationCommon) {
       int dl_symb = scc->tdd_UL_DL_ConfigurationCommon->pattern1.nrofDownlinkSymbols;
       if(dl_symb > 1) {
-        // mixed slot TDA with TDA index 1
-        timedomainresourceallocation = CALLOC(1,sizeof(NR_PDSCH_TimeDomainResourceAllocation_t));
-        // k0: Slot offset between DCI and its scheduled PDSCH (see TS 38.214 clause 5.1.2.1) When the field is absent the UE applies the value 0.
-        //timedomainresourceallocation->k0 = calloc(1,sizeof(*timedomainresourceallocation->k0));
-        //*timedomainresourceallocation->k0 = 0;
-        timedomainresourceallocation->mappingType = NR_PDSCH_TimeDomainResourceAllocation__mappingType_typeA;
-        timedomainresourceallocation->startSymbolAndLength = get_SLIV(len_coreset,dl_symb-len_coreset); // mixed slot configuration starting in symbol 1 til the end of the dl allocation
-        ASN_SEQUENCE_ADD(&pdsch_TimeDomainAllocationList->list, timedomainresourceallocation);
+        // mixed slot TDA with TDA index 2
+        struct NR_PDSCH_TimeDomainResourceAllocation *timedomainresourceallocation2 = CALLOC(1,sizeof(NR_PDSCH_TimeDomainResourceAllocation_t));
+        timedomainresourceallocation2->mappingType = NR_PDSCH_TimeDomainResourceAllocation__mappingType_typeA;
+        timedomainresourceallocation2->startSymbolAndLength = get_SLIV(len_coreset,dl_symb-len_coreset); // mixed slot configuration starting in symbol 1 til the end of the dl allocation
+        ASN_SEQUENCE_ADD(&pdsch_TimeDomainAllocationList->list, timedomainresourceallocation2);
       }
     }
   }