diff --git a/ns/NS_Tests.ttcn b/ns/NS_Tests.ttcn
index 8bbb43c..9fbd5ab 100644
--- a/ns/NS_Tests.ttcn
+++ b/ns/NS_Tests.ttcn
@@ -626,6 +626,41 @@
 	f_clean_ns_codec();
 }
 
+/* Test if SNS fails when all signalling NSVCs failes
+ * 3GPP TS 48.016 § 7.4b.1.1
+ * 1. do success SNS configuration
+ * 2. change sig weight of the seconds inactive bind
+ * 3. add second bind to SNS
+ * 4. stop reacting to NS_ALIVE on first NSVC (only NSVC with sig weight)
+ * 5. expect SNS SIZE
+ */
+testcase TC_sns_bss_all_signalling_nsvcs_failed() runs on RAW_Test_CT {
+	g_handle_rx_alive := true;
+	f_init_vty();
+	f_init_ns_codec(mp_nsconfig);
+	f_init_ns_codec(mp_nsconfig, 1);
+	f_incoming_sns_size();
+	f_incoming_sns_config();
+	f_outgoing_sns_config();
+	var default d := activate(as_rx_alive_tx_ack());
+
+	f_vty_config2(NSVTY, {"ns", "bind udp local2"}, "ip-sns signalling-weight 0 data-weight 99");
+	f_vty_config2(NSVTY, {"ns", "nse " & int2str(g_nsconfig.nsei)}, "ip-sns-bind local2");
+	f_incoming_sns_add(idx_add := 1, w_sig := 0, w_user := 99);
+	as_rx_alive_tx_ack(oneshot := true, idx := 1);
+	activate(as_rx_alive_tx_ack(idx := 1));
+	/* 2x NSVCs up, stop first NSVC */
+	deactivate(d);
+	/* libosmocore will rotate the SNS binds on failure */
+	NSCP[0].receive(t_NS_ALIVE);
+	NSCP[0].receive(t_NS_ALIVE);
+	NSCP[0].receive(t_NS_ALIVE);
+	f_incoming_sns_size(idx := 1);
+
+	setverdict(pass);
+	f_clean_ns_codec();
+}
+
 control {
 	if (mp_dialect == NS2_DIALECT_STATIC_RESETBLOCK or mp_dialect == NS2_DIALECT_IPACCESS) {
 		execute( TC_tx_reset() );
@@ -676,6 +711,7 @@
 		execute( TC_sns_bss_add() );
 		execute( TC_sns_bss_del() );
 		execute( TC_sns_bss_add_change_del() );
+		execute( TC_sns_bss_all_signalling_nsvcs_failed() );
 	}
 }