diff --git a/openair1/SIMULATION/NR_PHY/ulsim.c b/openair1/SIMULATION/NR_PHY/ulsim.c
index 767c90e7e2..3cea63975f 100644
--- a/openair1/SIMULATION/NR_PHY/ulsim.c
+++ b/openair1/SIMULATION/NR_PHY/ulsim.c
@@ -150,7 +150,7 @@ int main(int argc, char **argv)
   NR_DL_FRAME_PARMS *frame_parms;
   int loglvl = OAILOG_WARNING;
   uint64_t SSB_positions=0x01;
-  uint16_t nb_symb_sch = 14;
+  uint16_t nb_symb_sch = 12;
   int start_symbol = 0;
   uint16_t nb_rb = 50;
   uint8_t Imcs = 9;
@@ -441,18 +441,6 @@ int main(int argc, char **argv)
   }
 
   unsigned char harq_pid = 0;
-  unsigned int TBS;
-  unsigned int available_bits;
-  uint8_t nb_re_dmrs = UE->dmrs_UplinkConfig.pusch_maxLength*(UE->dmrs_UplinkConfig.pusch_dmrs_type == pusch_dmrs_type1?6:4);
-  uint8_t length_dmrs = 1;
-  unsigned char mod_order;
-  uint16_t code_rate;
-
-  mod_order      = nr_get_Qm_ul(Imcs, 0);
-  code_rate      = nr_get_code_rate_ul(Imcs, 0);
-  available_bits = nr_get_G(nb_rb, nb_symb_sch, nb_re_dmrs, length_dmrs, mod_order, 1);
-  TBS            = nr_compute_tbs(mod_order, code_rate, nb_rb, nb_symb_sch, nb_re_dmrs*length_dmrs, 0, precod_nbr_layers);
-
 
   NR_gNB_ULSCH_t *ulsch_gNB = gNB->ulsch[UE_id][0];
   //nfapi_nr_ul_config_ulsch_pdu *rel15_ul = &ulsch_gNB->harq_processes[harq_pid]->ulsch_pdu;
@@ -481,7 +469,7 @@ int main(int argc, char **argv)
   unsigned char mod_order;
   uint16_t code_rate;
 
-  for (i = 0; i < NR_SYMBOLS_PER_SLOT; i++)
+  for (i = start_symbol; i < nb_symb_sch; i++)
       number_dmrs_symbols += is_dmrs_symbol(i,
                                             0,
                                             0,
@@ -541,8 +529,8 @@ int main(int argc, char **argv)
       pusch_pdu->rnti = n_rnti;
       pusch_pdu->mcs_index = Imcs;
       pusch_pdu->mcs_table = 0; 
-      pusch_pdu->target_code_rate = nr_get_code_rate_ul(pusch_pdu->mcs_index,pusch_pdu->mcs_table); 
-      pusch_pdu->qam_mod_order = nr_get_Qm_ul(pusch_pdu->mcs_index,pusch_pdu->mcs_table) ;
+      pusch_pdu->target_code_rate = code_rate;
+      pusch_pdu->qam_mod_order = mod_order;
       pusch_pdu->transform_precoding = 0;
       pusch_pdu->data_scrambling_id = 0;
       pusch_pdu->nrOfLayers = 1;
@@ -561,13 +549,7 @@ int main(int argc, char **argv)
       pusch_pdu->pusch_data.rv_index = 0;
       pusch_pdu->pusch_data.harq_process_id = 0;
       pusch_pdu->pusch_data.new_data_indicator = 0;
-      pusch_pdu->pusch_data.tb_size = nr_compute_tbs(pusch_pdu->mcs_index,
-						     pusch_pdu->target_code_rate,
-						     pusch_pdu->rb_size,
-						     pusch_pdu->nr_of_symbols,
-						     nb_re_dmrs*length_dmrs,
-						     0,
-						     pusch_pdu->nrOfLayers = 1);
+      pusch_pdu->pusch_data.tb_size = TBS;
       pusch_pdu->pusch_data.num_cb = 0;