diff --git a/hnbgw/HNBGW_Tests.ttcn b/hnbgw/HNBGW_Tests.ttcn
index 808db75..97c5644 100644
--- a/hnbgw/HNBGW_Tests.ttcn
+++ b/hnbgw/HNBGW_Tests.ttcn
@@ -1513,6 +1513,7 @@
 	f_rua_expect(tx);
 }
 
+/* RAB release with Cause NAS/Normal (successful/orderly release) */
 testcase TC_rab_release() runs on test_CT {
 	var ConnHdlr vc_conn;
 	g_num_hnbs := 1;
@@ -1524,6 +1525,18 @@
 	f_shutdown_helper();
 }
 
+/* RAB release with Cause abnormal */
+testcase TC_rab_release_abnormal() runs on test_CT {
+	var ConnHdlr vc_conn;
+	g_num_hnbs := 1;
+	f_init();
+
+	vc_conn := f_start_handler_with_pars(refers(f_tc_rab_release), t_pars(8, rab_rel_cause := ts_RanapCause_radio_conn_lost));
+	vc_conn.done;
+
+	f_shutdown_helper();
+}
+
 friend function f_tc_rab_assign_mgcp_to(charstring id, TestHdlrParams pars) runs on ConnHdlr {
 	var MgcpCommand mgcp_cmd;
 	var RANAP_PDU tx;
@@ -2793,6 +2806,7 @@
 	execute(TC_ranap_ps_bidir());
 	execute(TC_rab_assignment());
 	execute(TC_rab_release());
+	execute(TC_rab_release_abnormal());
 	execute(TC_rab_assign_fail());
 	execute(TC_rab_assign_mgcp_to());
 	execute(TC_rab_assign_mgw_iuup_addr_chg());