pcu: test counter bts.0.pch.requests

Related: SYS#4878
Change-Id: I366b5c699708a69ca0e9d8c74319a241a46ed842
diff --git a/pcu/PCU_Tests.ttcn b/pcu/PCU_Tests.ttcn
index 3d4bcee..804644a 100644
--- a/pcu/PCU_Tests.ttcn
+++ b/pcu/PCU_Tests.ttcn
@@ -3207,7 +3207,11 @@
 
 	if (mp_osmo_pcu_newer_than_0_9_0) {
 		var StatsDExpects expect := {
-			{ name := "TTCN3.pcu.sgsn.0.rx_paging_ps", mtype := "c", min := 1, max := 1 }
+			{ name := "TTCN3.pcu.sgsn.0.rx_paging_ps", mtype := "c", min := 1, max := 1 },
+			/* After the PCU receives the paging request from SGSN,
+			 * and it doesn't have any errors, PCU sends it to the
+			 * BTS to do paging over PCH. */
+			{ name := "TTCN3.bts.0.pch.requests", mtype := "c", min := 1, max := 1 }
 		};
 		f_statsd_expect(expect);
 	}