diff --git a/openair1/SIMULATION/NR_PHY/ulsim.c b/openair1/SIMULATION/NR_PHY/ulsim.c
index 83c1c31826..f6222c4c84 100644
--- a/openair1/SIMULATION/NR_PHY/ulsim.c
+++ b/openair1/SIMULATION/NR_PHY/ulsim.c
@@ -249,7 +249,9 @@ int main(int argc, char *argv[])
   InitSinLUT();
 
   int c;
-  while ((c = getopt(argc, argv, "--:O:a:b:c:d:ef:g:h:i:jk:m:n:p:q:r:s:t:u:v:w:y:z:A:C:F:G:H:I:M:N:PR:S:T:U:L:ZW:E:X:")) != -1) {
+  bool setAffinity=false;
+  char gNBthreads[128]="n";
+  while ((c = getopt(argc, argv, "--:O:a:b:c:d:ef:g:h:i:jk:m:n:p:q:r:s:t:u:v:w:y:z:A:C:F:G:H:I:M:N:PR:S:T:U:L:ZW:E:X:Y:")) != -1) {
     /* ignore long options starting with '--', option '-O' and their arguments that are handled by configmodule */
     /* with this opstring getopt returns 1 for non-option arguments, refer to 'man 3 getopt' */
     if (c == 1 || c == '-' || c == 'O')
@@ -494,6 +496,13 @@ int main(int argc, char *argv[])
       AssertFatal(filename_csv != NULL, "strdup() error: errno %d\n", errno);
       break;
 
+    case 'Y':
+      threadCnt = sizeof(gNBthreads)-1;
+      strncpy(gNBthreads, optarg, threadCnt);
+      gNBthreads[threadCnt]=0;
+      setAffinity=true;
+      break;
+
     case 'Z':
       transform_precoding = transformPrecoder_enabled;
       num_dmrs_cdm_grps_no_data = 2;
@@ -592,7 +601,11 @@ int main(int argc, char *argv[])
   gNB->RU_list[0] = calloc(1, sizeof(**gNB->RU_list));
   gNB->RU_list[0]->rfdevice.openair0_cfg = openair0_cfg;
 
-  initFloatingCoresTpool(threadCnt, &gNB->threadPool, false, "gNB-tpool");
+  if (setAffinity == false)
+    initFloatingCoresTpool(threadCnt, &gNB->threadPool, false, "gNB-tpool");
+  else
+    initNamedTpool(gNBthreads, &gNB->threadPool, true, "gNB-tpool");
+
   initNotifiedFIFO(&gNB->respDecode);
 
   initNotifiedFIFO(&gNB->respPuschSymb);