scheduling PRACH and filling fapi PRACH PDU

nfapi/open-nFAPI/nfapi/public_inc/nfapi_nr_interface_scf.h

@@ -1028,10 +1028,12 @@ typedef struct
 {
   uint16_t phys_cell_id;
   uint8_t  num_prach_ocas;
+  // SCF PRACH PDU format field does not consider A1/B1 etc. possibilities
+  // We added 9 = A1/B1 10 = A2/B2 11 A3/B3
   uint8_t  prach_format;
   uint8_t  num_ra;
   uint8_t  prach_start_symbol;
-  uint16_t num_cs;//
+  uint16_t num_cs;
   nfapi_nr_ul_beamforming_t beamforming;
 
 } nfapi_nr_prach_pdu_t;

openair1/PHY/NR_TRANSPORT/nr_prach.h

@@ -37,18 +37,6 @@ uint16_t nr_du[838];
 /*************************************
 * The following tables defined for NR
 **************************************/
-// Table 6.3.3.1-5 (38.211) NCS for preamble formats with delta_f_RA = 1.25 KHz
-uint16_t NCS_unrestricted_delta_f_RA_125[16] = {0,13,15,18,22,26,32,38,46,59,76,93,119,167,279,419};
-uint16_t NCS_restricted_TypeA_delta_f_RA_125[15]   = {15,18,22,26,32,38,46,55,68,82,100,128,158,202,237}; // high-speed case set Type A
-uint16_t NCS_restricted_TypeB_delta_f_RA_125[13]   = {15,18,22,26,32,38,46,55,68,82,100,118,137}; // high-speed case set Type B
-
-// Table 6.3.3.1-6 (38.211) NCS for preamble formats with delta_f_RA = 5 KHz
-uint16_t NCS_unrestricted_delta_f_RA_5[16] = {0,13,26,33,38,41,49,55,64,76,93,119,139,209,279,419};
-uint16_t NCS_restricted_TypeA_delta_f_RA_5[16]   = {36,57,72,81,89,94,103,112,121,132,137,152,173,195,216,237}; // high-speed case set Type A
-uint16_t NCS_restricted_TypeB_delta_f_RA_5[14]   = {36,57,60,63,65,68,71,77,81,85,97,109,122,137}; // high-speed case set Type B
-
-// Table 6.3.3.1-7 (38.211) NCS for preamble formats with delta_f_RA = 15 * 2mu KHz where mu = {0,1,2,3}
-uint16_t NCS_unrestricted_delta_f_RA_15[16] = {0,2,4,6,8,10,12,13,15,17,19,23,27,34,46,69};
 
 //Table 6.3.3.1-3: Mapping from logical index i to sequence number u for preamble formats with L_RA = 839
 uint16_t prach_root_sequence_map_0_3[838] = {

openair1/PHY/NR_TRANSPORT/nr_prach_common.c

@@ -218,9 +218,9 @@ void compute_nr_prach_seq(uint16_t rootSequenceIndex,
     
     AssertFatal(zeroCorrelationZoneConfig<=15,
 		"FATAL, Illegal Ncs_config for unrestricted format %"PRIu8"\n", zeroCorrelationZoneConfig );
-    if (prach_fmt<3)  NCS = NCS_unrestricted_delta_f_RA_125[zeroCorrelationZoneConfig];
+   /* if (prach_fmt<3)  NCS = NCS_unrestricted_delta_f_RA_125[zeroCorrelationZoneConfig];
     if (prach_fmt==3) NCS = NCS_unrestricted_delta_f_RA_5[zeroCorrelationZoneConfig];
-    if (prach_fmt>3)  NCS = NCS_unrestricted_delta_f_RA_15[zeroCorrelationZoneConfig];
+    if (prach_fmt>3)  NCS = NCS_unrestricted_delta_f_RA_15[zeroCorrelationZoneConfig];*/
     
     num_preambles = (NCS==0) ? 64 : ((64*NCS)/N_ZC);
 
@@ -235,7 +235,7 @@ void compute_nr_prach_seq(uint16_t rootSequenceIndex,
 
     AssertFatal(zeroCorrelationZoneConfig<=14,
 		"FATAL, Illegal Ncs_config for restricted format %"PRIu8"\n", zeroCorrelationZoneConfig );
-    if (prach_fmt<3){
+ /*   if (prach_fmt<3){
       if (restricted_Type == 0) NCS = NCS_restricted_TypeA_delta_f_RA_125[zeroCorrelationZoneConfig]; // for TypeA, this is hardcoded. FIXME
       if (restricted_Type == 1) NCS = NCS_restricted_TypeB_delta_f_RA_125[zeroCorrelationZoneConfig]; // for TypeB, this is hardcoded. FIXME
     }
@@ -245,7 +245,7 @@ void compute_nr_prach_seq(uint16_t rootSequenceIndex,
     }
     if (prach_fmt>3){
 
-    }
+    }*/
 
     nr_fill_du(prach_fmt);
 

openair1/SCHED_NR/phy_procedures_nr_gNB.c

@@ -391,15 +391,15 @@ void phy_procedures_gNB_common_RX(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx)
 void phy_procedures_gNB_uespec_RX(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx) {
 
   nfapi_nr_ul_tti_request_t     *UL_tti_req  = &gNB->UL_tti_req;
-  int num_pusch_pdu = UL_tti_req->n_pdus;
+  int num_pdus = UL_tti_req->n_pdus;
 
-  LOG_D(PHY,"phy_procedures_gNB_uespec_RX frame %d, slot %d, num_pusch_pdu %d\n",frame_rx,slot_rx,num_pusch_pdu);
+  LOG_D(PHY,"phy_procedures_gNB_uespec_RX frame %d, slot %d, num_pdus %d\n",frame_rx,slot_rx,num_pdus);
 
   gNB->UL_INFO.rx_ind.rx_indication_body.number_of_pdus  = 0;
 
-  for (int i = 0; i < num_pusch_pdu; i++) {
+  for (int i = 0; i < num_pdus; i++) {
     switch (UL_tti_req->pdus_list[i].pdu_type) {
-    case NFAPI_NR_UL_CONFIG_PUSCH_PDU_TYPE:{
+      case NFAPI_NR_UL_CONFIG_PUSCH_PDU_TYPE:
         LOG_D(PHY,"frame %d, slot %d, Got NFAPI_NR_UL_CONFIG_PUSCH_PDU_TYPE\n",frame_rx,slot_rx);
 
         nfapi_nr_pusch_pdu_t  *pusch_pdu = &UL_tti_req->pdus_list[0].pusch_pdu;
@@ -418,7 +418,13 @@ void phy_procedures_gNB_uespec_RX(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx)
         nr_ulsch_procedures(gNB, frame_rx, slot_rx, ULSCH_id, harq_pid);
         nr_fill_rx_indication(gNB, frame_rx, slot_rx, ULSCH_id, harq_pid);  // indicate SDU to MAC
         nr_fill_crc_indication(gNB, frame_rx, slot_rx, ULSCH_id, 0);
-      }
+        break;
+      case NFAPI_NR_UL_CONFIG_PUCCH_PDU_TYPE:
+	LOG_D(PHY,"frame %d, slot %d, Got NFAPI_NR_UL_CONFIG_PUCCH_PDU_TYPE\n",frame_rx,slot_rx);
+        break;
+      case NFAPI_NR_UL_CONFIG_PRACH_PDU_TYPE:
+	LOG_D(PHY,"frame %d, slot %d, Got NFAPI_NR_UL_CONFIG_PRACH_PDU_TYPE\n",frame_rx,slot_rx);
+        break;
     }
   }
 }

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.c

@@ -32,6 +32,52 @@
 
 #include "LAYER2/NR_MAC_gNB/mac_proto.h"
 
+// Table 6.3.3.1-5 (38.211) NCS for preamble formats with delta_f_RA = 1.25 KHz
+uint16_t NCS_unrestricted_delta_f_RA_125[16] = {0,13,15,18,22,26,32,38,46,59,76,93,119,167,279,419};
+uint16_t NCS_restricted_TypeA_delta_f_RA_125[15]   = {15,18,22,26,32,38,46,55,68,82,100,128,158,202,237}; // high-speed case set Type A
+uint16_t NCS_restricted_TypeB_delta_f_RA_125[13]   = {15,18,22,26,32,38,46,55,68,82,100,118,137}; // high-speed case set Type B
+
+// Table 6.3.3.1-6 (38.211) NCS for preamble formats with delta_f_RA = 5 KHz
+uint16_t NCS_unrestricted_delta_f_RA_5[16] = {0,13,26,33,38,41,49,55,64,76,93,119,139,209,279,419};
+uint16_t NCS_restricted_TypeA_delta_f_RA_5[16]   = {36,57,72,81,89,94,103,112,121,132,137,152,173,195,216,237}; // high-speed case set Type A
+uint16_t NCS_restricted_TypeB_delta_f_RA_5[14]   = {36,57,60,63,65,68,71,77,81,85,97,109,122,137}; // high-speed case set Type B
+
+// Table 6.3.3.1-7 (38.211) NCS for preamble formats with delta_f_RA = 15 * 2mu KHz where mu = {0,1,2,3}
+uint16_t NCS_unrestricted_delta_f_RA_15[16] = {0,2,4,6,8,10,12,13,15,17,19,23,27,34,46,69};
+
+uint16_t get_NCS(uint8_t index, uint16_t format0, uint8_t restricted_set_config) {
+
+  if (format0 < 3) {
+    switch(restricted_set_config){
+      case 0:
+        return(NCS_unrestricted_delta_f_RA_125[index]);
+      case 1:
+        return(NCS_restricted_TypeA_delta_f_RA_125[index]);
+      case 2:
+        return(NCS_restricted_TypeB_delta_f_RA_125[index]);
+    default:
+      AssertFatal(1==0,"Invalid restricted set config value %d",restricted_set_config);
+    }
+  }
+  else {
+    if (format0 == 3) {
+      switch(restricted_set_config){
+        case 0:
+          return(NCS_unrestricted_delta_f_RA_5[index]);
+        case 1:
+          return(NCS_restricted_TypeA_delta_f_RA_5[index]);
+        case 2:
+          return(NCS_restricted_TypeB_delta_f_RA_5[index]);
+      default:
+        AssertFatal(1==0,"Invalid restricted set config value %d",restricted_set_config);
+      }
+    }
+    else
+       return(NCS_unrestricted_delta_f_RA_15[index]);
+  }
+}
+
+
 // Table 6.3.3.2-2: Random access configurations for FR1 and paired spectrum/supplementary uplink
 // the column 5, (SFN_nbr is a bitmap where we set bit to '1' in the position of the subframe where the RACH can be sent.
 // E.g. in row 4, and column 5 we have set value 512 ('1000000000') which means RACH can be sent at subframe 9.

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.h

@@ -53,6 +53,8 @@ int get_nr_prach_info_from_index(uint8_t index,
                                  uint8_t *N_t_slot,
                                  uint8_t *N_dur);
 
+uint16_t get_NCS(uint8_t index, uint16_t format, uint8_t restricted_set_config);
+
 typedef enum {
   NR_DL_DCI_FORMAT_1_0 = 0,
   NR_DL_DCI_FORMAT_1_1,

openair2/LAYER2/NR_MAC_gNB/config.c

@@ -122,13 +122,23 @@ void config_common(int Mod_idP, int pdsch_AntennaPorts, NR_ServingCellConfigComm
     }
   }
 
+  lte_frame_type_t frame_type;
+  uint16_t band;
+  int32_t offset;
+
+  get_band((cfg->carrier_config.dl_frequency.value)*1000,
+           &band,
+           &offset,
+           &frame_type);
+
+  RC.nrmac[Mod_idP]->common_channels[0].frame_type = frame_type;
 
   // Cell configuration
   cfg->cell_config.phy_cell_id.value = *scc->physCellId;
   cfg->cell_config.phy_cell_id.tl.tag = NFAPI_NR_CONFIG_PHY_CELL_ID_TAG;
   cfg->num_tlv++;
 
-  cfg->cell_config.frame_duplex_type.value = 1;
+  cfg->cell_config.frame_duplex_type.value = frame_type;
   cfg->cell_config.frame_duplex_type.tl.tag = NFAPI_NR_CONFIG_FRAME_DUPLEX_TYPE_TAG;
   cfg->num_tlv++;
 

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c

@@ -263,18 +263,122 @@ void schedule_nr_SRS(module_id_t module_idP, frame_t frameP, sub_frame_t subfram
 }
 */
 
-/*
-void schedule_nr_prach(module_id_t module_idP, frame_t frameP, sub_frame_t subframeP) {
-
-  gNB_MAC_INST *gNB = RC.nrmac[module_idP];
-
-  // schedule PRACH for iniital BWP 
 
-  if (is_initialBWP_prach_subframe(frameP,subframeP)<0) return;
+void schedule_nr_prach(module_id_t module_idP, frame_t frameP, sub_frame_t slotP) {
 
-  // fill FAPI
+  gNB_MAC_INST *gNB = RC.nrmac[module_idP];
+  NR_COMMON_channels_t *cc = gNB->common_channels;
+  NR_ServingCellConfigCommon_t *scc = cc->ServingCellConfigCommon;
+  nfapi_nr_ul_tti_request_t *UL_tti_req = &RC.nrmac[module_idP]->UL_tti_req[0];
+
+  uint8_t config_index = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->rach_ConfigGeneric.prach_ConfigurationIndex;
+  uint8_t mu,N_dur,N_t_slot,start_symbol;
+  uint16_t format;
+
+  if (scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->msg1_SubcarrierSpacing)
+    mu = *scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->msg1_SubcarrierSpacing;
+  else
+    mu = scc->downlinkConfigCommon->frequencyInfoDL->scs_SpecificCarrierList.list.array[0]->subcarrierSpacing;
+
+  // prach is scheduled according to configuration index and tables 6.3.3.2.2 to 6.3.3.2.4
+  if ( get_nr_prach_info_from_index(config_index,
+                                    (int)frameP,
+                                    (int)slotP,
+                                    scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA,
+                                    mu,
+                                    cc->frame_type,
+                                    &format,
+                                    &start_symbol,
+                                    &N_t_slot,
+                                    &N_dur) ) {
+
+    int fdm = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->rach_ConfigGeneric.msg1_FDM;
+    uint16_t format0 = format&0xff;      // first column of format from table
+    uint16_t format1 = (format>>8)&0xff; // second column of format from table
+
+    UL_tti_req->SFN = frameP;
+    UL_tti_req->Slot = slotP;
+    for (int n=0; n<(1<<fdm); n++) { // one structure per frequency domain occasion
+      UL_tti_req->pdus_list[UL_tti_req->n_pdus].pdu_type = NFAPI_NR_UL_CONFIG_PRACH_PDU_TYPE;
+      UL_tti_req->pdus_list[UL_tti_req->n_pdus].pdu_size = sizeof(nfapi_nr_prach_pdu_t);
+      nfapi_nr_prach_pdu_t  *prach_pdu = &UL_tti_req->pdus_list[UL_tti_req->n_pdus].prach_pdu;
+      memset(prach_pdu,0,sizeof(nfapi_nr_prach_pdu_t));
+      UL_tti_req->n_pdus+=1;
+
+      // filling the prach fapi structure
+      prach_pdu->phys_cell_id = *scc->physCellId;
+      prach_pdu->num_prach_ocas = N_t_slot;
+      prach_pdu->prach_start_symbol = start_symbol;
+      prach_pdu->num_ra = n;
+      prach_pdu->num_cs = get_NCS(scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->rach_ConfigGeneric.zeroCorrelationZoneConfig,
+                                  format0,
+                                  scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->restrictedSetConfig);
+      // SCF PRACH PDU format field does not consider A1/B1 etc. possibilities
+      // We added 9 = A1/B1 10 = A2/B2 11 A3/B3
+      if (format1!=0xff) {
+        switch(format0) {
+          case 0xa1:
+            prach_pdu->prach_format = 9;
+            break;
+          case 0xa2:
+            prach_pdu->prach_format = 10;
+            break;
+          case 0xa3:
+            prach_pdu->prach_format = 10;
+            break;
+        default:
+          AssertFatal(1==0,"Only formats A1/B1 A2/B2 A3/B3 are valid for dual format");
+        }
+      }
+      else{
+        switch(format0) {
+          case 0xa1:
+            prach_pdu->prach_format = 0;
+            break;
+          case 0xa2:
+            prach_pdu->prach_format = 1;
+            break;
+          case 0xa3:
+            prach_pdu->prach_format = 2;
+            break;
+          case 0xb1:
+            prach_pdu->prach_format = 3;
+            break;
+          case 0xb2:
+            prach_pdu->prach_format = 4;
+            break;
+          case 0xb3:
+            prach_pdu->prach_format = 5;
+            break;
+          case 0xb4:
+            prach_pdu->prach_format = 6;
+            break;
+          case 0xc0:
+            prach_pdu->prach_format = 7;
+            break;
+          case 0xc2:
+            prach_pdu->prach_format = 8;
+            break;
+          case 0:
+            // long formats are handled @ PHY
+            break;
+          case 1:
+            // long formats are handled @ PHY
+            break;
+          case 2:
+            // long formats are handled @ PHY
+            break;
+          case 3:
+            // long formats are handled @ PHY
+            break;
+        default:
+          AssertFatal(1==0,"Invalid PRACH format");
+        }
+      }
+    }
+  }
 }
-*/
+
 
 /*
 void copy_nr_ulreq(module_id_t module_idP, frame_t frameP, sub_frame_t slotP)
@@ -382,7 +486,7 @@ void gNB_dlsch_ulsch_scheduler(module_id_t module_idP,
   // Phytest scheduling
   if (phy_test && slot_txP==1){
     nr_schedule_uss_dlsch_phytest(module_idP, frame_txP, slot_txP,NULL);
-    nr_schedule_RA(module_idP, frame_txP, slot_txP);
+    //nr_schedule_RA(module_idP, frame_txP, slot_txP);
     // resetting ta flag
     gNB->ta_len = 0;
   }
@@ -396,6 +500,9 @@ void gNB_dlsch_ulsch_scheduler(module_id_t module_idP,
   } //is_nr_DL_slot
 
   if (is_nr_UL_slot(cc->ServingCellConfigCommon,slot_rxP)) { 
+
+    schedule_nr_prach(module_idP, frame_rxP, slot_rxP);
+
     if (phy_test && slot_rxP==8){
       nr_schedule_uss_ulsch_phytest(module_idP, frame_rxP, slot_rxP);
     }

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_phytest.c

@@ -716,11 +716,11 @@ void nr_schedule_uss_ulsch_phytest(int Mod_idP,
 
   UL_tti_req->SFN = frameP;
   UL_tti_req->Slot = slotP;
-  UL_tti_req->n_pdus = 1;
-  UL_tti_req->pdus_list[0].pdu_type = NFAPI_NR_UL_CONFIG_PUSCH_PDU_TYPE;
-  UL_tti_req->pdus_list[0].pdu_size = sizeof(nfapi_nr_pusch_pdu_t);
-  nfapi_nr_pusch_pdu_t  *pusch_pdu = &UL_tti_req->pdus_list[0].pusch_pdu;
+  UL_tti_req->pdus_list[UL_tti_req->n_pdus].pdu_type = NFAPI_NR_UL_CONFIG_PUSCH_PDU_TYPE;
+  UL_tti_req->pdus_list[UL_tti_req->n_pdus].pdu_size = sizeof(nfapi_nr_pusch_pdu_t);
+  nfapi_nr_pusch_pdu_t  *pusch_pdu = &UL_tti_req->pdus_list[UL_tti_req->n_pdus].pusch_pdu;
   memset(pusch_pdu,0,sizeof(nfapi_nr_pusch_pdu_t));
+  UL_tti_req->n_pdus+=1;  
   
   LOG_D(MAC, "Scheduling UE specific PUSCH\n");
   //UL_tti_req = &nr_mac->UL_tti_req[CC_id];

openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h

@@ -141,6 +141,7 @@ typedef struct {
   int p_gNB;
   int Ncp;
   int nr_band;
+  lte_frame_type_t frame_type;
   uint64_t dl_CarrierFreq;
   NR_BCCH_BCH_Message_t *mib;
   NR_ServingCellConfigCommon_t *ServingCellConfigCommon;