bsc: fix testcase TC_paging_imsi_nochan

The testcase TC_paging_imsi_nochan assumes that a paging for no
channel, with no specifc cell associated and without TMSI is
illegal. This is not correct. All these fields have legal values
and the TMSI field is optional.

- Replace the testcase implementation, use f_pageing_helper() to
  create the paging.

Change-Id: I6a56fb0ee06ae7e72a7ac2b6b058ad54f94127ab
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index cc7294a..347380a 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -1007,31 +1007,7 @@
 testcase TC_paging_imsi_nochan() runs on test_CT {
 	var BSSMAP_FIELD_CellIdentificationList cid_list;
 	cid_list := valueof(ts_BSSMAP_CIL_noCell);
-	var integer i;
-
-	f_init();
-
-	/* Clear the queue, it might still contain stuff like BCCH FILLING */
-	for (i := 0; i < NUM_BTS; i := i + 1) {
-		IPA_RSL[i].clear;
-	}
-
-	f_bssap_tx_ud(ts_BSSMAP_Paging('001010123456789'H, cid_list, omit, omit));
-
-	/* wait for some time until when paging messages would appear */
-	f_sleep(3.0);
-
-	for (i := 0; i < NUM_BTS; i := i + 1) {
-		timer T := 0.01;
-		T.start;
-		alt {
-		[] IPA_RSL[i].receive(tr_ASP_RSL_UD(IPAC_PROTO_RSL_TRX0, tr_RSL_PAGING_CMD(?))) {
-			setverdict(fail, "Received unexpected paging");
-			}
-		[] T.timeout {}
-		}
-	}
-	setverdict(pass);
+	f_pageing_helper('001010100000001'H, cid_list, c_BtsId_all, omit, omit);
 }
 
 /* PAGING by IMSI + TMSI */