diff --git a/fr/FR_Tests.ttcn b/fr/FR_Tests.ttcn
index 973f262..5777856 100644
--- a/fr/FR_Tests.ttcn
+++ b/fr/FR_Tests.ttcn
@@ -89,15 +89,25 @@
 
 type record UE_Pars {
 	hexstring imsi,
-	OCT4 tlli
+	OCT4 tlli,
+	float tguard
 };
 
 type function void_fn(charstring id) runs on UE_CT;
 
+private altstep as_ue_tguard() runs on UE_CT {
+[] g_Tguard.timeout {
+	setverdict(fail, "Tguard timeout after ", g_pars.tguard);
+	self.stop;
+	}
+}
+
 function f_handler_init(void_fn fn, charstring id, UE_Pars pars) runs on UE_CT {
 	g_pars := pars;
 	llc := f_llc_create(false);
 	f_bssgp_client_register(g_pars.imsi, g_pars.tlli);
+	g_Tguard.start(g_pars.tguard);
+	activate(as_ue_tguard());
 
 	fn.apply(id);
 	f_bssgp_client_unregister(g_pars.imsi);
@@ -126,7 +136,8 @@
 	var UE_CT ue_comp;
 	var UE_Pars ue_pars := {
 		imsi := f_gen_imsi(imsi_suffix),
-		tlli := f_gprs_tlli_random()
+		tlli := f_gprs_tlli_random(),
+		tguard := t_guard
 	};
 
 	ue_comp := UE_CT.create(id);