diff --git a/openair2/UTIL/LOG/vcd_signal_dumper.c b/openair2/UTIL/LOG/vcd_signal_dumper.c
index a026cfb081a70e1ffd8ab833dd711c329b6ee33e..607fe857031ca1a06ea747bae8e1b36d26396c11 100644
--- a/openair2/UTIL/LOG/vcd_signal_dumper.c
+++ b/openair2/UTIL/LOG/vcd_signal_dumper.c
@@ -89,9 +89,6 @@ const char* eurecomVariablesNames[] = {
   "subframe_TX1_UE",
   "subframe_RX0_UE",
   "subframe_RX1_UE",
-  "missed_slot_enb",
-  "daq_mbox",
-  "rx_offset_mbox",
   "ue_rx_offset",
   "diff2",
   "hw_subframe",
@@ -222,7 +219,10 @@ const char* eurecomFunctionsNames[] = {
   "ue_lock_mutex_rxtx_for_cnt_decrement1",
   "ue_lock_mutex_rxtx_for_cnt_increment0",
   "ue_lock_mutex_rxtx_for_cnt_increment1",
-
+  /* simulation signals */
+  "do_DL_sig",
+  "do_UL_sig",
+  "UE_trx_read",
  /* RRH signals  */ 
   "eNB_tx",
   "eNB_rx",
diff --git a/openair2/UTIL/LOG/vcd_signal_dumper.h b/openair2/UTIL/LOG/vcd_signal_dumper.h
index a47cdc059d1a8236b78255b28d457ad8979613e5..c610883c22476d3fef48acb33acb84a9dca2af71 100644
--- a/openair2/UTIL/LOG/vcd_signal_dumper.h
+++ b/openair2/UTIL/LOG/vcd_signal_dumper.h
@@ -65,9 +65,6 @@ typedef enum {
   VCD_SIGNAL_DUMPER_VARIABLES_SUBFRAME_NUMBER_TX1_UE,
   VCD_SIGNAL_DUMPER_VARIABLES_SUBFRAME_NUMBER_RX0_UE,
   VCD_SIGNAL_DUMPER_VARIABLES_SUBFRAME_NUMBER_RX1_UE,
-  VCD_SIGNAL_DUMPER_VARIABLES_MISSED_SLOTS_ENB,
-  VCD_SIGNAL_DUMPER_VARIABLES_DAQ_MBOX,
-  VCD_SIGNAL_DUMPER_VARIABLES_UE_OFFSET_MBOX,
   VCD_SIGNAL_DUMPER_VARIABLES_UE_RX_OFFSET,
   VCD_SIGNAL_DUMPER_VARIABLES_DIFF,
   VCD_SIGNAL_DUMPER_VARIABLES_HW_SUBFRAME,
@@ -199,7 +196,10 @@ typedef enum {
   VCD_SIGNAL_DUMPER_FUNCTIONS_UE_LOCK_MUTEX_RXTX_FOR_CNT_DECREMENT1,
   VCD_SIGNAL_DUMPER_FUNCTIONS_UE_LOCK_MUTEX_RXTX_FOR_CNT_INCREMENT0,
   VCD_SIGNAL_DUMPER_FUNCTIONS_UE_LOCK_MUTEX_RXTX_FOR_CNT_INCREMENT1,
-
+  /* SIMULATION signals */ 
+  VCD_SIGNAL_DUMPER_FUNCTIONS_SIM_DO_DL_SIGNAL,
+  VCD_SIGNAL_DUMPER_FUNCTIONS_SIM_DO_UL_SIGNAL,
+  VCD_SIGNAL_DUMPER_FUNCTIONS_SIM_UE_TRX_READ,
   /* RRH signals  */ 
   VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_TX,
   VCD_SIGNAL_DUMPER_FUNCTIONS_eNB_RX,
diff --git a/targets/RT/USER/rfsim.c b/targets/RT/USER/rfsim.c
index d8e5fbc825413812193020c54f60b98ed7ab2717..cc9b70295af459467b135dafaed50e12fb03ee4b 100644
--- a/targets/RT/USER/rfsim.c
+++ b/targets/RT/USER/rfsim.c
@@ -51,6 +51,7 @@
 #include "common/ran_context.h"
 #include "PHY/defs_UE.h"
 #include "PHY/defs_eNB.h"
+#include "vcd_signal_dumper.h"
 
 RAN_CONTEXT_t RC;
 extern PHY_VARS_UE ***PHY_vars_UE_g;
@@ -192,7 +193,7 @@ int ru_trx_read(openair0_device *device, openair0_timestamp *ptimestamp, void **
       LOG_D(SIM,"RU_trx_read generating UL subframe %d (Ts %llu, current TS %llu)\n",
 	    subframe,(unsigned long long)*ptimestamp,
 	    (unsigned long long)sim.current_ru_rx_timestamp[ru_id][CC_id]);
-      
+      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_SIM_DO_UL_SIGNAL,1);      
       do_UL_sig(&sim,
 		subframe,
 		0,  // abstraction_flag
@@ -200,6 +201,7 @@ int ru_trx_read(openair0_device *device, openair0_timestamp *ptimestamp, void **
 		0,  // frame is only used for abstraction
 		ru_id,
 		CC_id);
+      VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_SIM_DO_UL_SIGNAL,0);
     }
     sim.last_ru_rx_timestamp[ru_id][CC_id] += RC.ru[ru_id]->frame_parms.samples_per_tti;
     sample_count += RC.ru[ru_id]->frame_parms.samples_per_tti;
@@ -211,6 +213,7 @@ int ru_trx_read(openair0_device *device, openair0_timestamp *ptimestamp, void **
 
 int UE_trx_read(openair0_device *device, openair0_timestamp *ptimestamp, void **buff, int nsamps, int cc)
 {
+  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_SIM_UE_TRX_READ,1);
   int UE_id = device->Mod_id;
   int CC_id  = device->CC_id;
 
@@ -264,6 +267,7 @@ int UE_trx_read(openair0_device *device, openair0_timestamp *ptimestamp, void **
 	  UE_id,nsamps,subframe,
 	  (int)(sim.last_UE_rx_timestamp[UE_id][CC_id]%sptti));
 
+    VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_SIM_DO_DL_SIGNAL,1);
     do_DL_sig(&sim,
 	      subframe,
 	      sim.last_UE_rx_timestamp[UE_id][CC_id]%sptti,
@@ -272,6 +276,7 @@ int UE_trx_read(openair0_device *device, openair0_timestamp *ptimestamp, void **
 	      &PHY_vars_UE_g[UE_id][CC_id]->frame_parms,
 	      UE_id,
 	      CC_id);
+    VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_SIM_DO_DL_SIGNAL,0);
     LOG_D(PHY,"UE %d: DL simulation 6: UE_trx_read @ TS %"PRIi64" (%"PRIi64")=> frame %d, subframe %d\n",
 	  UE_id, sim.current_UE_rx_timestamp[UE_id][CC_id],
 	  sim.last_UE_rx_timestamp[UE_id][CC_id],
@@ -286,7 +291,7 @@ int UE_trx_read(openair0_device *device, openair0_timestamp *ptimestamp, void **
 
   }
 
-
+  VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_SIM_UE_TRX_READ,0);
   return(nsamps);
 }
 
diff --git a/targets/RT/USER/rru_if4p5_simulator.gtkw b/targets/RT/USER/rru_if4p5_simulator.gtkw
new file mode 100644
index 0000000000000000000000000000000000000000..40ed3b5c7d385ea23574b27dea87fb0e3f45cfa5
--- /dev/null
+++ b/targets/RT/USER/rru_if4p5_simulator.gtkw
@@ -0,0 +1,42 @@
+[*]
+[*] GTKWave Analyzer v3.3.58 (w)1999-2014 BSI
+[*] Tue Jun  5 12:44:02 2018
+[*]
+[dumpfile] "/tmp/openair_dump_UE.vcd"
+[dumpfile_mtime] "Tue Jun  5 12:38:07 2018"
+[dumpfile_size] 21826387
+[savefile] "/home/knopp/oai/openairinterface5g/targets/RT/USER/rru_if4p5_simulator.gtkw"
+[timestart] 6591570000
+[size] 1301 716
+[pos] 309 0
+*-22.793451 29983948856 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
+[sst_width] 312
+[signals_width] 262
+[sst_expanded] 1
+[sst_vpaned_height] 294
+@29
+functions.UE_trx_read
+@28
+functions.trx_read
+functions.trx_write
+@24
+variables.trx_write_flags[63:0]
+@28
+functions.trx_write_if
+functions.send_if4
+functions.trx_read_if
+functions.recv_if4
+@24
+variables.trx_ts[63:0]
+variables.trx_tst[63:0]
+variables.frame_number_RX0_RU[63:0]
+variables.subframe_number_RX0_RU[63:0]
+variables.frame_number_TX0_RU[63:0]
+variables.subframe_number_TX0_RU[63:0]
+@28
+functions.do_DL_sig
+functions.do_UL_sig
+functions.phy_procedures_ru_feprx0
+functions.phy_procedures_ru_feptx_ofdm0
+[pattern_trace] 1
+[pattern_trace] 0
diff --git a/targets/RT/USER/rru_if4p5_usrp.gtkw b/targets/RT/USER/rru_if4p5_usrp.gtkw
index 1a13e6d15f1e243af267b137390b0145a2956bec..93bac4981209952bd86f947296d8276fb38e94b9 100644
--- a/targets/RT/USER/rru_if4p5_usrp.gtkw
+++ b/targets/RT/USER/rru_if4p5_usrp.gtkw
@@ -1,23 +1,23 @@
 [*]
 [*] GTKWave Analyzer v3.3.58 (w)1999-2014 BSI
-[*] Sun Jan 15 07:26:50 2017
+[*] Tue Jun  5 09:36:17 2018
 [*]
-[dumpfile] "/tmp/openair_dump_eNB.vcd"
-[dumpfile_mtime] "Sun Jan 15 07:04:19 2017"
-[dumpfile_size] 18140627
-[savefile] "/home/uprru1/oai/openairinterface5g/targets/RT/USER/rru_if4p5_usrp.gtkw"
-[timestart] 29977510000
+[dumpfile] "/tmp/openair_dump_UE.vcd"
+[dumpfile_mtime] "Tue Jun  5 09:22:52 2018"
+[dumpfile_size] 23057775
+[savefile] "/home/knopp/oai/openairinterface5g/targets/RT/USER/rru_if4p5_usrp.gtkw"
+[timestart] 25050480000
 [size] 1301 716
 [pos] 309 0
 *-21.793451 29983948856 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
-[sst_width] 284
+[sst_width] 312
 [signals_width] 262
 [sst_expanded] 1
 [sst_vpaned_height] 294
 @28
 functions.trx_read
 functions.trx_write
-@25
+@24
 variables.trx_write_flags[63:0]
 @28
 functions.trx_write_if
@@ -27,23 +27,10 @@ functions.recv_if4
 @24
 variables.trx_ts[63:0]
 variables.trx_tst[63:0]
-@28
-functions.eNB_thread_rxtx0
-@24
-variables.frame_number_RX0_eNB[63:0]
-variables.subframe_number_RX0_eNB[63:0]
-variables.frame_number_TX0_eNB[63:0]
-variables.subframe_number_TX0_eNB[63:0]
-@28
-functions.eNB_thread_rxtx1
-@24
-variables.frame_number_RX1_eNB[63:0]
-variables.subframe_number_RX1_eNB[63:0]
-variables.frame_number_TX1_eNB[63:0]
-variables.subframe_number_TX1_eNB[63:0]
-@28
-functions.phy_eNB_ofdm_mod_l
-functions.phy_eNB_slot_fep
-functions.phy_enb_prach_rx
+variables.frame_number_RX0_RU[63:0]
+variables.subframe_number_RX0_RU[63:0]
+variables.frame_number_TX0_RU[63:0]
+@25
+variables.subframe_number_TX0_RU[63:0]
 [pattern_trace] 1
 [pattern_trace] 0