diff --git a/openair1/PHY/defs_UE.h b/openair1/PHY/defs_UE.h
old mode 100644
new mode 100755
index 55f8c9639a..0a4bd36731
--- a/openair1/PHY/defs_UE.h
+++ b/openair1/PHY/defs_UE.h
@@ -889,6 +889,7 @@ typedef struct {
 struct rx_tx_thread_data {
   PHY_VARS_UE    *UE;
   UE_rxtx_proc_t *proc;
+  uint16_t       ue_thread_id;
 };
 
 
diff --git a/targets/RT/USER/lte-softmodem.h b/targets/RT/USER/lte-softmodem.h
index 9682bb0a56..56598a6c14 100755
--- a/targets/RT/USER/lte-softmodem.h
+++ b/targets/RT/USER/lte-softmodem.h
@@ -148,6 +148,7 @@
 {"emul-iface",                 CONFIG_HLP_EMULIFACE,  0,                strptr:&emul_iface,                 defstrval:"lo", TYPE_STRING,   100},   \
 {"L2-emul",                    NULL,  		      0,                u8ptr:&nfapi_mode,                  defuintval:3, TYPE_UINT8,   0}, \
 {"num-ues",            	       NULL,		      	  0,		u16ptr:&(NB_UE_INST),	    defuintval:1,   	TYPE_UINT16,	   0},     \
+{"nums_ue_thread"  ,          NULL,                   0,                 u16ptr:&(NB_THREAD_INST),    defuintval:1,       TYPE_UINT16,        0},   \
 {"r"  ,                        CONFIG_HLP_PRB,        0,                u8ptr:&(frame_parms[0]->N_RB_DL),   defintval:25,   TYPE_UINT8,    0},     \
 {"dlsch-demod-shift",     	 CONFIG_HLP_DLSHIFT,	0,		  iptr:(int32_t *)&dlsch_demod_shift,	defintval:0,			   TYPE_INT,	  0},			   \
 {"usrp-args",               CONFIG_HLP_USRP_ARGS,   0,                      strptr:(char **)&usrp_args,         defstrval:"type=b200",          TYPE_STRING,    0},                     \
diff --git a/targets/RT/USER/lte-uesoftmodem.c b/targets/RT/USER/lte-uesoftmodem.c
index 0081e7be8b..2a2c874a91 100755
--- a/targets/RT/USER/lte-uesoftmodem.c
+++ b/targets/RT/USER/lte-uesoftmodem.c
@@ -823,7 +823,7 @@ int main( int argc, char **argv )
   // Default value for the number of UEs. It will hold,
   // if not changed from the command line option --num-ues
   NB_UE_INST=1;
-
+  NB_THREAD_INST=1;
 #if defined (XFORMS)
   int ret;
 #endif
@@ -859,6 +859,16 @@ printf("~~~~~~~~~~~~~~~~~~~~successfully get the parallel config[%d], worker con
 
   printf("NFAPI_MODE value: %d \n", nfapi_mode);
 
+  // Checking option of nums_ue_thread.
+  if(NB_THREAD_INST < 1){
+    printf("Running with 0 UE rxtx thread, exiting.\n");
+    abort();
+  }
+  // Checking option's relation between nums_ue_thread and num-ues
+  if(NB_UE_INST <NB_THREAD_INST ){
+    printf("Number of UEs < number of UE rxtx threads, exiting.\n");
+    abort();
+  }
   // Not sure if the following is needed here
   /*if (CONFIG_ISFLAGSET(CONFIG_ABORT)) {
       if (UE_flag == 0) {
@@ -1051,7 +1061,7 @@ printf("~~~~~~~~~~~~~~~~~~~~successfully get the parallel config[%d], worker con
   
   
 #if defined(ENABLE_ITTI)
-    if (create_tasks_ue(1) < 0) {
+    if (create_tasks_ue(NB_UE_INST) < 0) {
       printf("cannot create ITTI tasks\n");
       exit(-1); // need a softer mode
     }