diff --git a/sysinfo/GSM_SystemInformation.ttcn b/sysinfo/GSM_SystemInformation.ttcn
index 8001dd9..74852d4 100644
--- a/sysinfo/GSM_SystemInformation.ttcn
+++ b/sysinfo/GSM_SystemInformation.ttcn
@@ -142,7 +142,7 @@
 		LocationAreaIdentification	lai,
 		CellSelectionParameters		cell_sel_par,
 		RachControlParameters		rach_control,
-		ChannelDescription		cbch_chan_desc optional,
+		ChannelDescriptionTV		cbch_chan_desc optional,
 		MobileAllocationT		cbch_mobile_alloc optional,
 		RestOctets			rest_octets
 	} with { variant "TAG(cbch_chan_desc, iei = '64'O; cbch_mobile_alloc, iei = '72'O)" };
diff --git a/sysinfo/GSM_Types.ttcn b/sysinfo/GSM_Types.ttcn
index ecc714b..924788c 100644
--- a/sysinfo/GSM_Types.ttcn
+++ b/sysinfo/GSM_Types.ttcn
@@ -238,19 +238,20 @@
 	} with { variant (len) "LENGTHTO(cm2)" };
 
 
-
-
 	/* 44.018 10.5.2.5 */
 	type record ChannelDescription {
-		OCT1		iei,
-		BIT5		chan_type_tdma_offset,
-		uint3_t		tn,
+		RslChannelNr	chan_nr,
 		uint3_t		tsc,
 		boolean		h,
 		uint12_t	arfcn optional,
 		MaioHsn		maio_hsn optional
-	} with { variant (arfcn) "PRESENCE(h = true)"
-		 variant (maio_hsn) "PRESENCE(h = false)" };
+	} with { variant (arfcn) "PRESENCE(h = false)"
+		 variant (maio_hsn) "PRESENCE(h = true)" };
+
+	type record ChannelDescriptionTV {
+		OCT1		iei,
+		ChannelDescription v
+	} with { variant "" };
 
 	/* 10.5.2.8 */
 	type enumerated ChannelNeeded {