PCUIF_Types: add record PCUIF_pch_dt

The record PCUIF_pch_dt, coresponds to struct gsm_pcu_if_pch_dt in
pcuif_proto.h. It will be needed when we introduce support for the TLLI
based confirmation of IMMEDIATE ASSIGNMENT messages that are sent via
the PCH.

Related: OS#5927
Change-Id: Ia705d3a6fe7adb863acd29e968f8dc6b2066a497
diff --git a/library/PCUIF_Types.ttcn b/library/PCUIF_Types.ttcn
index 654061c..5ddcc9e 100644
--- a/library/PCUIF_Types.ttcn
+++ b/library/PCUIF_Types.ttcn
@@ -312,6 +312,17 @@
 			other,		OTHERWISE)"
 };
 
+/* Record to send a (confirmed) IMMEDIATE ASSIGNMENT message via PCH. The record is sent by the PCU to the BTS as a
+ * data request (data_req) under SAPI PCU_IF_SAPI_PCH_DT. */
+type record PCUIF_pch_dt {
+	OCT4		tlli,
+	charstring	imsi length(17),
+	octetstring	data length(23)
+} with {
+	variant (tlli) "BYTEORDER(last)"
+	variant (imsi) "FIELDLENGTH(17), ALIGN(left)"
+	variant (data) "FIELDLENGTH(23), ALIGN(left)"
+};
 
 type union PCUIF_MsgUnion {
 	PCUIF_data		data_req,