diff --git a/openair1/PHY/LTE_TRANSPORT/if4_tools.c b/openair1/PHY/LTE_TRANSPORT/if4_tools.c
index f81e423cd3..8353a7fbaf 100644
--- a/openair1/PHY/LTE_TRANSPORT/if4_tools.c
+++ b/openair1/PHY/LTE_TRANSPORT/if4_tools.c
@@ -307,10 +307,12 @@ void recv_IF4p5(RU_t *ru, int *frame, int *subframe, uint16_t *packet_type, uint
 				 0) < 0) {
     perror("ETHERNET read");
     read_cnt++;
+/*
     if (read_cnt == 2) {
       ru->cmd = STOP_RU;
       return;
-    }
+    }*/
+    LOG_E(PHY,"if4p5 read_cnt %d\n",read_cnt);
   }
   if (ru->idx<=1) VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_READ_IF0+ru->idx, 0 );
   if (eth->flags == ETH_RAW_IF4p5_MODE) {
diff --git a/openair1/SCHED/ru_procedures.c b/openair1/SCHED/ru_procedures.c
index c6915e2004..2f7cd86a7a 100644
--- a/openair1/SCHED/ru_procedures.c
+++ b/openair1/SCHED/ru_procedures.c
@@ -97,9 +97,10 @@ void feptx0(RU_t *ru,int slot) {
 					                      fp->nb_prefix_samples,
 					                      CYCLIC_PREFIX);
     else {
-      AssertFatal(ru->generate_dmrs_sync==1 && (fp->frame_type != TDD || ru->is_slave == 1),
-		  "ru->generate_dmrs_sync should not be set, frame_type %d, is_slave %d\n",
-		  fp->frame_type,ru->is_slave);
+      AssertFatal(ru->generate_dmrs_sync == 0 ||
+                  ru->generate_dmrs_sync==1 && (fp->frame_type != TDD || ru->is_slave == 1),
+		  "ru->generate_dmrs_sync should not be set (%d), frame_type %s, is_slave %d\n",
+		  ru->generate_dmrs_sync,(fp->frame_type==1)?"TDD":"FDD",ru->is_slave);
 
       if (ru->generate_dmrs_sync == 1 && slot == 0 && subframe == 1 && aa==0) {
 	generate_drs_pusch((PHY_VARS_UE *)NULL,
diff --git a/targets/RT/USER/lte-ru.c b/targets/RT/USER/lte-ru.c
index 8fdc276def..ff71cd1196 100644
--- a/targets/RT/USER/lte-ru.c
+++ b/targets/RT/USER/lte-ru.c
@@ -2208,10 +2208,11 @@ void init_RU_proc(RU_t *ru) {
     
     if ((ru->if_timing == synch_to_other) ||
 	(ru->function == NGFI_RRU_IF5) ||
-	(ru->function == NGFI_RRU_IF4p5)) 
-	{
-		pthread_create( &proc->pthread_asynch_rxtx, attr_asynch, ru_thread_asynch_rxtx, (void*)ru );
-	}
+	(ru->function == NGFI_RRU_IF4p5)) {
+        LOG_I(PHY,"Starting ru_thread_asynch_rxtx, ru->is_slave %d, ru->generate_dmrs_sync %d\n",
+              ru->is_slave,ru->generate_dmrs_sync);
+	pthread_create( &proc->pthread_asynch_rxtx, attr_asynch, ru_thread_asynch_rxtx, (void*)ru );
+    }
     
     
   }
@@ -2243,7 +2244,7 @@ void init_RU_proc(RU_t *ru) {
 
   if (ru->function == eNodeB_3GPP) {
     usleep(10000);
-    LOG_I(PHY, "Signaling main thread that RU %d (is_slave %d) is ready in state %s\n",ru->idx,ru->is_slave,ru_states[ru->state]);
+    LOG_I(PHY, "Signaling main thread that RU %d (is_slave %d,send_dmrs %d) is ready in state %s\n",ru->idx,ru->is_slave,ru->generate_dmrs_sync,ru_states[ru->state]);
     pthread_mutex_lock(&RC.ru_mutex);
     RC.ru_mask &= ~(1<<ru->idx);
     pthread_cond_signal(&RC.ru_cond);
@@ -2567,7 +2568,15 @@ void init_RU(char *rf_config_file, clock_source_t clock_source,clock_source_t ti
     ru->rf_config_file = rf_config_file;
     ru->idx          = ru_id;              
     ru->ts_offset    = 0;
-    ru->in_synch     = (ru->is_slave == 1) ? 0 : 1;
+    if (ru->is_slave == 1) {
+       ru->in_synch    = 0;
+       ru->dmrssync   = 0;
+    }
+    else {
+       ru->in_synch    = 1;
+       ru->dmrssync    = 0;
+       ru->generate_dmrs_sync=send_dmrssync;
+    }
     ru->cmd	     = EMPTY;
     // use eNB_list[0] as a reference for RU frame parameters
     // NOTE: multiple CC_id are not handled here yet!
@@ -2598,7 +2607,7 @@ void init_RU(char *rf_config_file, clock_source_t clock_source,clock_source_t ti
     //    LOG_I(PHY,"Initializing RRU descriptor %d : (%s,%s,%d)\n",ru_id,ru_if_types[ru->if_south],eNB_timing[ru->if_timing],ru->function);
 
     set_function_spec_param(ru);
-    LOG_I(PHY,"Starting ru_thread %d\n",ru_id);
+    LOG_I(PHY,"Starting ru_thread %d, is_slave %d, send_dmrs %d\n",ru_id,ru->is_slave,ru->dmrssync);
 
     init_RU_proc(ru);
 
diff --git a/targets/RT/USER/rru_if4p5_usrp.gtkw b/targets/RT/USER/rru_if4p5_usrp.gtkw
index 93bac49812..244d464d94 100644
--- a/targets/RT/USER/rru_if4p5_usrp.gtkw
+++ b/targets/RT/USER/rru_if4p5_usrp.gtkw
@@ -1,16 +1,16 @@
 [*]
-[*] GTKWave Analyzer v3.3.58 (w)1999-2014 BSI
-[*] Tue Jun  5 09:36:17 2018
+[*] GTKWave Analyzer v3.3.66 (w)1999-2015 BSI
+[*] Fri Aug 24 12:15:17 2018
 [*]
-[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
+[dumpfile] "/tmp/openair_rru_dump.vcd"
+[dumpfile_mtime] "Fri Aug 24 12:10:15 2018"
+[dumpfile_size] 27839039
+[savefile] "/home/libra/oai/openairinterface5g/targets/RT/USER/rru_if4p5_usrp.gtkw"
+[timestart] 10300310000
 [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] 312
+*-23.793451 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] 391
 [signals_width] 262
 [sst_expanded] 1
 [sst_vpaned_height] 294
@@ -20,9 +20,11 @@ functions.trx_write
 @24
 variables.trx_write_flags[63:0]
 @28
-functions.trx_write_if
 functions.send_if4
-functions.trx_read_if
+@29
+functions.phy_procedures_ru_feprx0
+@28
+functions.phy_procedures_ru_feptx_ofdm0
 functions.recv_if4
 @24
 variables.trx_ts[63:0]
@@ -30,7 +32,6 @@ 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]
-@25
 variables.subframe_number_TX0_RU[63:0]
 [pattern_trace] 1
 [pattern_trace] 0