diff --git a/openair1/PHY/INIT/nr_init.c b/openair1/PHY/INIT/nr_init.c
index 67eedd5da7..b8f98af55c 100644
--- a/openair1/PHY/INIT/nr_init.c
+++ b/openair1/PHY/INIT/nr_init.c
@@ -77,7 +77,7 @@ int l1_north_init_gNB() {
 
 int phy_init_nr_gNB(PHY_VARS_gNB *gNB,
                     unsigned char is_secondary_gNB,
-                    unsigned char abstraction_flag) {
+                    unsigned char lowmem_flag) {
   // shortcuts
   NR_DL_FRAME_PARMS *const fp       = &gNB->frame_parms;
   nfapi_nr_config_request_scf_t *cfg = &gNB->gNB_config;
@@ -95,6 +95,15 @@ int phy_init_nr_gNB(PHY_VARS_gNB *gNB,
 
   while(gNB->configured == 0) usleep(10000);
 
+  if (lowmem_flag == 1) {
+    gNB->number_of_nr_dlsch_max = 2;
+    gNB->number_of_nr_ulsch_max = 2;
+  }
+  else {
+    gNB->number_of_nr_dlsch_max = NUMBER_OF_NR_DLSCH_MAX;
+    gNB->number_of_nr_ulsch_max = NUMBER_OF_NR_ULSCH_MAX;
+  }  
+
   load_dftslib();
 
   LOG_D(PHY,"[MSC_NEW][FRAME 00000][PHY_gNB][MOD %02"PRIu8"][]\n", gNB->Mod_id);
@@ -250,7 +259,7 @@ int phy_init_nr_gNB(PHY_VARS_gNB *gNB,
 
   int N_RB_UL = cfg->carrier_config.ul_grid_size[cfg->ssb_config.scs_common.value].value;
 
-  for (int ULSCH_id=0; ULSCH_id<NUMBER_OF_NR_ULSCH_MAX; ULSCH_id++) {
+  for (int ULSCH_id=0; ULSCH_id<gNB->number_of_nr_ulsch_max; ULSCH_id++) {
     pusch_vars[ULSCH_id] = (NR_gNB_PUSCH *)malloc16_clear( sizeof(NR_gNB_PUSCH) );
     pusch_vars[ULSCH_id]->rxdataF_ext           = (int32_t **)malloc16(Prx*sizeof(int32_t *) );
     pusch_vars[ULSCH_id]->rxdataF_ext2          = (int32_t **)malloc16(Prx*sizeof(int32_t *) );
@@ -335,7 +344,7 @@ void phy_free_nr_gNB(PHY_VARS_gNB *gNB)
   free_and_zero(prach_vars->prach_ifft[0]);
   free_and_zero(prach_vars->rxsigF[0]);
 */
-  for (int ULSCH_id=0; ULSCH_id<NUMBER_OF_NR_ULSCH_MAX; ULSCH_id++) {
+  for (int ULSCH_id=0; ULSCH_id<gNB->number_of_nr_ulsch_max; ULSCH_id++) {
     for (int i = 0; i < 2; i++) {
       free_and_zero(pusch_vars[ULSCH_id]->rxdataF_ext[i]);
       free_and_zero(pusch_vars[ULSCH_id]->rxdataF_ext2[i]);
@@ -533,9 +542,9 @@ void init_nr_transport(PHY_VARS_gNB *gNB) {
     AssertFatal(gNB->pucch[i]!=NULL,"Can't initialize pucch %d \n", i);
   }
 
-  for (i=0; i<NUMBER_OF_NR_DLSCH_MAX; i++) {
+  for (i=0; i<gNB->number_of_nr_dlsch_max; i++) {
 
-    LOG_I(PHY,"Allocating Transport Channel Buffers for DLSCH %d/%d\n",i,NUMBER_OF_NR_DLSCH_MAX);
+    LOG_I(PHY,"Allocating Transport Channel Buffers for DLSCH %d/%d\n",i,gNB->number_of_nr_dlsch_max);
 
     for (j=0; j<2; j++) {
       gNB->dlsch[i][j] = new_gNB_dlsch(fp,1,16,NSOFT,0,grid_size);
@@ -543,9 +552,9 @@ void init_nr_transport(PHY_VARS_gNB *gNB) {
     }
   }
 
-  for (i=0; i<NUMBER_OF_NR_ULSCH_MAX; i++) {
+  for (i=0; i<gNB->number_of_nr_ulsch_max; i++) {
 
-    LOG_I(PHY,"Allocating Transport Channel Buffer for ULSCH  %d/%d\n",i,NUMBER_OF_NR_ULSCH_MAX);
+    LOG_I(PHY,"Allocating Transport Channel Buffer for ULSCH  %d/%d\n",i,gNB->number_of_nr_ulsch_max);
 
     for (j=0; j<2; j++) {
       // ULSCH for data
diff --git a/openair1/PHY/INIT/phy_init.h b/openair1/PHY/INIT/phy_init.h
index 2cbf926a4d..d79f812eed 100644
--- a/openair1/PHY/INIT/phy_init.h
+++ b/openair1/PHY/INIT/phy_init.h
@@ -399,7 +399,7 @@ int init_nr_ue_signal(PHY_VARS_NR_UE *ue,int nb_connected_eNB,uint8_t abstractio
 void init_nr_ue_transport(PHY_VARS_NR_UE *ue,int abstraction_flag);
 void init_N_TA_offset(PHY_VARS_NR_UE *ue);
 void nr_dump_frame_parms(NR_DL_FRAME_PARMS *frame_parms);
-int phy_init_nr_gNB(PHY_VARS_gNB *gNB, unsigned char is_secondary_gNB, unsigned char abstraction_flag);
+int phy_init_nr_gNB(PHY_VARS_gNB *gNB, unsigned char is_secondary_gNB, unsigned char lowmem_flag);
 void nr_phy_config_request(NR_PHY_Config_t *gNB);
 void nr_phy_config_request_sim(PHY_VARS_gNB *gNB,int N_RB_DL,int N_RB_UL,int mu,int Nid_cell,uint64_t position_in_burst);
 void phy_free_nr_gNB(PHY_VARS_gNB *gNB);
diff --git a/openair1/PHY/NR_TRANSPORT/nr_dci_tools.c b/openair1/PHY/NR_TRANSPORT/nr_dci_tools.c
index 3814c78295..a1a7201c1b 100644
--- a/openair1/PHY/NR_TRANSPORT/nr_dci_tools.c
+++ b/openair1/PHY/NR_TRANSPORT/nr_dci_tools.c
@@ -239,7 +239,7 @@ void nr_fill_dci(PHY_VARS_gNB *gNB,
     //uint64_t *dci_pdu = (uint64_t*)pdcch_pdu_rel15->dci_pdu[i].Payload;
 
     int dlsch_id = find_nr_dlsch(pdcch_pdu_rel15->dci_pdu[i].RNTI,gNB,SEARCH_EXIST_OR_FREE);
-    if( (dlsch_id<0) || (dlsch_id>=NUMBER_OF_NR_DLSCH_MAX) ){
+    if( (dlsch_id<0) || (dlsch_id>=gNB->number_of_nr_dlsch_max) ){
       LOG_E(PHY,"illegal dlsch_id found!!! rnti %04x dlsch_id %d\n",(unsigned int)pdcch_pdu_rel15->dci_pdu[i].RNTI,dlsch_id);
       return;
     }
diff --git a/openair1/PHY/NR_TRANSPORT/nr_dlsch.c b/openair1/PHY/NR_TRANSPORT/nr_dlsch.c
index 1cce5e1174..56cf0b4bb3 100644
--- a/openair1/PHY/NR_TRANSPORT/nr_dlsch.c
+++ b/openair1/PHY/NR_TRANSPORT/nr_dlsch.c
@@ -132,7 +132,7 @@ uint8_t nr_generate_pdsch(PHY_VARS_gNB *gNB,
   time_stats_t *dlsch_interleaving_stats=&gNB->dlsch_interleaving_stats;
   time_stats_t *dlsch_segmentation_stats=&gNB->dlsch_segmentation_stats;
 
-  for (int dlsch_id=0;dlsch_id<NUMBER_OF_NR_DLSCH_MAX;dlsch_id++) {
+  for (int dlsch_id=0;dlsch_id<gNB->number_of_nr_dlsch_max;dlsch_id++) {
     dlsch = gNB->dlsch[dlsch_id][0];
     if (dlsch->slot_tx[slot] == 0) continue;
 
@@ -430,6 +430,6 @@ void dump_pdsch_stats(PHY_VARS_gNB *gNB) {
 
 void clear_pdsch_stats(PHY_VARS_gNB *gNB) {
 
-  for (int i=0;i<NUMBER_OF_NR_DLSCH_MAX;i++)
+  for (int i=0;i<gNB->number_of_nr_dlsch_max;i++)
     memset((void*)&gNB->dlsch_stats[i],0,sizeof(gNB->dlsch_stats[i]));
 }
diff --git a/openair1/PHY/NR_TRANSPORT/nr_dlsch_tools.c b/openair1/PHY/NR_TRANSPORT/nr_dlsch_tools.c
index 05d6c4c112..543002827d 100644
--- a/openair1/PHY/NR_TRANSPORT/nr_dlsch_tools.c
+++ b/openair1/PHY/NR_TRANSPORT/nr_dlsch_tools.c
@@ -260,7 +260,7 @@ int16_t find_nr_dlsch(uint16_t rnti, PHY_VARS_gNB *gNB,find_type_t type) {
    int16_t first_free_index=-1;
  
    AssertFatal(gNB!=NULL,"gNB is null\n");
-   for (i=0; i<NUMBER_OF_NR_DLSCH_MAX; i++) {
+   for (i=0; i<gNB->number_of_nr_dlsch_max; i++) {
      AssertFatal(gNB->dlsch[i]!=NULL,"gNB->dlsch[%d] is null\n",i);
      AssertFatal(gNB->dlsch[i][0]!=NULL,"gNB->dlsch[%d][0] is null\n",i);
      LOG_D(PHY,"searching for rnti %x : dlsch_index %d=> harq_mask %x, rnti %x, first_free_index %d\n", rnti,i,
@@ -286,7 +286,7 @@ void nr_fill_dlsch(PHY_VARS_gNB *gNB,
   nfapi_nr_dl_tti_pdsch_pdu_rel15_t *rel15 = &pdsch_pdu->pdsch_pdu_rel15;
  
   int dlsch_id = find_nr_dlsch(rel15->rnti,gNB,SEARCH_EXIST);
-  AssertFatal( (dlsch_id>=0) && (dlsch_id<NUMBER_OF_NR_DLSCH_MAX),
+  AssertFatal( (dlsch_id>=0) && (dlsch_id<gNB->number_of_nr_dlsch_max),
               "illegal or no dlsch_id found!!! rnti %04x dlsch_id %d\n",rel15->rnti,dlsch_id);
   NR_gNB_DLSCH_t  *dlsch = gNB->dlsch[dlsch_id][0];
   NR_DL_gNB_HARQ_t *harq  = &dlsch->harq_process;
diff --git a/openair1/PHY/NR_TRANSPORT/nr_ulsch.c b/openair1/PHY/NR_TRANSPORT/nr_ulsch.c
index 0040f01544..e6e8fdb01b 100644
--- a/openair1/PHY/NR_TRANSPORT/nr_ulsch.c
+++ b/openair1/PHY/NR_TRANSPORT/nr_ulsch.c
@@ -41,7 +41,7 @@ int16_t find_nr_ulsch(uint16_t rnti, PHY_VARS_gNB *gNB,find_type_t type) {
   int16_t first_free_index=-1;
 
   AssertFatal(gNB!=NULL,"gNB is null\n");
-  for (i=0; i<NUMBER_OF_NR_ULSCH_MAX; i++) {
+  for (i=0; i<gNB->number_of_nr_ulsch_max; i++) {
     AssertFatal(gNB->ulsch[i]!=NULL,"gNB->ulsch[%d] is null\n",i);
     AssertFatal(gNB->ulsch[i][0]!=NULL,"gNB->ulsch[%d][0] is null\n",i);
     LOG_D(PHY,"searching for rnti %x : ulsch_index %d=> harq_mask %x, rnti %x, first_free_index %d\n", rnti,i,gNB->ulsch[i][0]->harq_mask,gNB->ulsch[i][0]->rnti,first_free_index);
@@ -62,7 +62,7 @@ void nr_fill_ulsch(PHY_VARS_gNB *gNB,
 
  
   int ulsch_id = find_nr_ulsch(ulsch_pdu->rnti,gNB,SEARCH_EXIST_OR_FREE);
-  AssertFatal( (ulsch_id>=0) && (ulsch_id<NUMBER_OF_NR_ULSCH_MAX),
+  AssertFatal( (ulsch_id>=0) && (ulsch_id<gNB->number_of_nr_ulsch_max),
               "illegal or no ulsch_id found!!! rnti %04x ulsch_id %d\n",ulsch_pdu->rnti,ulsch_id);
 
   NR_gNB_ULSCH_t  *ulsch = gNB->ulsch[ulsch_id][0];
@@ -139,7 +139,7 @@ void nr_ulsch_unscrambling_optim(int16_t* llr,
 
 void dump_pusch_stats(PHY_VARS_gNB *gNB) {
 
-  for (int i=0;i<NUMBER_OF_NR_ULSCH_MAX;i++)
+  for (int i=0;i<gNB->number_of_nr_ulsch_max;i++)
     if (gNB->ulsch_stats[i].rnti>0) 
       LOG_I(PHY,"ULSCH RNTI %x: round_trials %d(%1.1e):%d(%1.1e):%d(%1.1e):%d, current_Qm %d, current_RI %d, total_bytes RX/SCHED %d/%d\n",
 	    gNB->ulsch_stats[i].rnti,
@@ -159,6 +159,6 @@ void dump_pusch_stats(PHY_VARS_gNB *gNB) {
 
 void clear_pusch_stats(PHY_VARS_gNB *gNB) {
 
-  for (int i=0;i<NUMBER_OF_NR_ULSCH_MAX;i++)
+  for (int i=0;i<gNB->number_of_nr_ulsch_max;i++)
     memset((void*)&gNB->ulsch_stats[i],0,sizeof(gNB->ulsch_stats[i]));
 }
diff --git a/openair1/PHY/defs_gNB.h b/openair1/PHY/defs_gNB.h
index b7923adb0b..3bc45f023b 100644
--- a/openair1/PHY/defs_gNB.h
+++ b/openair1/PHY/defs_gNB.h
@@ -706,7 +706,8 @@ typedef struct PHY_VARS_gNB_s {
   //  nfapi_nr_dl_tti_pdcch_pdu    *pdcch_pdu;
   //  nfapi_nr_ul_dci_request_pdus_t  *ul_dci_pdu;
   nfapi_nr_dl_tti_ssb_pdu      ssb_pdu;
-
+  int                number_of_nr_dlsch_max;
+  int                number_of_nr_ulsch_max;
   uint16_t num_pdsch_rnti[80];
   NR_gNB_PBCH         pbch;
   nr_cce_t           cce_list[MAX_DCI_CORESET][NR_MAX_PDCCH_AGG_LEVEL];
diff --git a/openair1/SCHED_NR/fapi_nr_l1.c b/openair1/SCHED_NR/fapi_nr_l1.c
index d65d3b54bb..307ceb83db 100644
--- a/openair1/SCHED_NR/fapi_nr_l1.c
+++ b/openair1/SCHED_NR/fapi_nr_l1.c
@@ -161,7 +161,7 @@ void nr_schedule_response(NR_Sched_Rsp_t *Sched_INFO){
 
   int pdcch_received=0;
   gNB->num_pdsch_rnti[slot]=0;
-  for (int i=0; i<NUMBER_OF_NR_DLSCH_MAX; i++) {
+  for (int i=0; i<gNB->number_of_nr_dlsch_max; i++) {
     gNB->dlsch[i][0]->rnti=0;
     gNB->dlsch[i][0]->harq_mask=0;
   }
@@ -257,4 +257,4 @@ void nr_schedule_response(NR_Sched_Rsp_t *Sched_INFO){
     
   }
 
-}
\ No newline at end of file
+}
diff --git a/openair1/SCHED_NR/phy_procedures_nr_gNB.c b/openair1/SCHED_NR/phy_procedures_nr_gNB.c
index 9d7422745e..d403e860d3 100644
--- a/openair1/SCHED_NR/phy_procedures_nr_gNB.c
+++ b/openair1/SCHED_NR/phy_procedures_nr_gNB.c
@@ -475,7 +475,7 @@ void fill_ul_rb_mask(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx) {
           }
         }
       }
-      for (int ULSCH_id=0;ULSCH_id<NUMBER_OF_NR_ULSCH_MAX;ULSCH_id++) {
+      for (int ULSCH_id=0;ULSCH_id<gNB->number_of_nr_ulsch_max;ULSCH_id++) {
         NR_gNB_ULSCH_t *ulsch = gNB->ulsch[ULSCH_id][0];
         int harq_pid;
         NR_UL_gNB_HARQ_t *ulsch_harq;
@@ -607,7 +607,7 @@ void phy_procedures_gNB_uespec_RX(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx)
     }
   }
 
-  for (int ULSCH_id=0;ULSCH_id<NUMBER_OF_NR_ULSCH_MAX;ULSCH_id++) {
+  for (int ULSCH_id=0;ULSCH_id<gNB->number_of_nr_ulsch_max;ULSCH_id++) {
     NR_gNB_ULSCH_t *ulsch = gNB->ulsch[ULSCH_id][0];
     int harq_pid;
     int no_sig;
diff --git a/openair1/SIMULATION/NR_PHY/dlschsim.c b/openair1/SIMULATION/NR_PHY/dlschsim.c
index 00983553d8..41d73ff861 100644
--- a/openair1/SIMULATION/NR_PHY/dlschsim.c
+++ b/openair1/SIMULATION/NR_PHY/dlschsim.c
@@ -357,7 +357,7 @@ int main(int argc, char **argv)
 	frame_parms->Ncp = extended_prefix_flag ? EXTENDED : NORMAL;
 	crcTableInit();
 	nr_phy_config_request_sim(gNB, N_RB_DL, N_RB_DL, mu, Nid_cell,SSB_positions);
-	phy_init_nr_gNB(gNB, 0, 0);
+	phy_init_nr_gNB(gNB, 0, 1); //lowmem
 	//init_eNB_afterRU();
 	frame_length_complex_samples = frame_parms->samples_per_subframe;
 	//frame_length_complex_samples_no_prefix = frame_parms->samples_per_subframe_wCP;
diff --git a/openair1/SIMULATION/NR_PHY/dlsim.c b/openair1/SIMULATION/NR_PHY/dlsim.c
index 1f3edd8faf..a445672abb 100644
--- a/openair1/SIMULATION/NR_PHY/dlsim.c
+++ b/openair1/SIMULATION/NR_PHY/dlsim.c
@@ -694,7 +694,7 @@ int main(int argc, char **argv)
   rrc_mac_config_req_gNB(0,0,1,pusch_tgt_snrx10,pucch_tgt_snrx10,scc,0,0,NULL);
   // UE dedicated configuration
   rrc_mac_config_req_gNB(0,0,1,pusch_tgt_snrx10,pucch_tgt_snrx10,NULL,1,secondaryCellGroup->spCellConfig->reconfigurationWithSync->newUE_Identity,secondaryCellGroup);
-  phy_init_nr_gNB(gNB,0,0);
+  phy_init_nr_gNB(gNB,0,1); // lowmem
   N_RB_DL = gNB->frame_parms.N_RB_DL;
   NR_UE_info_t *UE_info = &RC.nrmac[0]->UE_info;
   UE_info->num_UEs=1;
diff --git a/openair1/SIMULATION/NR_PHY/prachsim.c b/openair1/SIMULATION/NR_PHY/prachsim.c
index 03cc07cc66..5eeea03511 100644
--- a/openair1/SIMULATION/NR_PHY/prachsim.c
+++ b/openair1/SIMULATION/NR_PHY/prachsim.c
@@ -576,7 +576,7 @@ int main(int argc, char **argv){
 
   memcpy((void*)&ru->config,(void*)&RC.gNB[0]->gNB_config,sizeof(ru->config));
   RC.nb_nr_L1_inst=1;
-  phy_init_nr_gNB(gNB,0,0);
+  phy_init_nr_gNB(gNB,0,1); //lowmem
   nr_phy_init_RU(ru);
   gNB->common_vars.rxdata = ru->common.rxdata;
   set_tdd_config_nr(&gNB->gNB_config, mu, 7, 6, 2, 4);
diff --git a/openair1/SIMULATION/NR_PHY/ulschsim.c b/openair1/SIMULATION/NR_PHY/ulschsim.c
index 6f2af73a1d..a2f272500e 100644
--- a/openair1/SIMULATION/NR_PHY/ulschsim.c
+++ b/openair1/SIMULATION/NR_PHY/ulschsim.c
@@ -394,7 +394,7 @@ int main(int argc, char **argv)
 
   nr_phy_config_request_sim(gNB, N_RB_UL, N_RB_UL, mu, Nid_cell, SSB_positions);
 
-  phy_init_nr_gNB(gNB, 0, 0);
+  phy_init_nr_gNB(gNB, 0, 1); //lowmem
 
   //configure UE
   UE = malloc(sizeof(PHY_VARS_NR_UE));
diff --git a/openair1/SIMULATION/NR_PHY/ulsim.c b/openair1/SIMULATION/NR_PHY/ulsim.c
index ae3e1afafc..1a8ffe3123 100644
--- a/openair1/SIMULATION/NR_PHY/ulsim.c
+++ b/openair1/SIMULATION/NR_PHY/ulsim.c
@@ -651,7 +651,7 @@ int main(int argc, char **argv)
   rrc_mac_config_req_gNB(0,0,1,pusch_tgt_snrx10,pucch_tgt_snrx10,scc,0,0,NULL);
   // UE dedicated configuration
   rrc_mac_config_req_gNB(0,0,1,pusch_tgt_snrx10,pucch_tgt_snrx10,NULL,1,secondaryCellGroup->spCellConfig->reconfigurationWithSync->newUE_Identity,secondaryCellGroup);
-  phy_init_nr_gNB(gNB,0,0);
+  phy_init_nr_gNB(gNB,0,1); //lowmem
   N_RB_DL = gNB->frame_parms.N_RB_DL;