diff --git a/library/GSM_RR_Types.ttcn b/library/GSM_RR_Types.ttcn
index d0d5d8e..bf650b2 100644
--- a/library/GSM_RR_Types.ttcn
+++ b/library/GSM_RR_Types.ttcn
@@ -1082,4 +1082,24 @@
 		ext_ra := ext_ra
 	};
 
+	template (value) ChannelDescription ts_ChanDescH0(template (value) RslChannelNr chan_nr,
+							  template (value) uint12_t arfcn,
+							  template (value) uint3_t tsc := 7) := {
+		chan_nr := chan_nr,
+		tsc := tsc,
+		h := false,
+		arfcn := arfcn,
+		maio_hsn := omit
+	}
+
+	template (value) ChannelDescription ts_ChanDescH1(template (value) RslChannelNr chan_nr,
+							  template (value) MaioHsn maio_hsn,
+							  template (value) uint3_t tsc := 7) := {
+		chan_nr := chan_nr,
+		tsc := tsc,
+		h := true,
+		arfcn := omit,
+		maio_hsn := maio_hsn
+	}
+
 } with { encode "RAW" ; variant "FIELDORDER(msb)" }