diff --git a/library/RSL_Types.ttcn b/library/RSL_Types.ttcn
index 16ce506..10284b8 100644
--- a/library/RSL_Types.ttcn
+++ b/library/RSL_Types.ttcn
@@ -1515,6 +1515,24 @@
 			*
 		}
 	}
+
+	template RSL_Message tr_RSL_MODE_MODIFY_REQ_with_OSMO_TSC(template RslChannelNr chan_nr,
+								  template RSL_IE_ChannelMode mode,
+								  template uint8_t tsc_set := ?,
+								  template uint8_t tsc := ?) := {
+		msg_disc := tr_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
+		msg_type := RSL_MT_MODE_MODIFY_REQ,
+		ies := {
+		    tr_RSL_IE(RSL_IE_Body:{chan_nr := chan_nr}),
+		    tr_RSL_IE(RSL_IE_Body:{chan_mode := mode}),
+		    tr_RSL_IE(RSL_IE_Body:{osmo_training_sequence := {
+							len := ?,
+							tsc_set := tsc_set,
+							tsc := tsc
+						  }
+					  })
+		}
+	};
 	
 	/* 8.4.10 BTS -> BSC */
 	template (value) RSL_Message ts_RSL_MODE_MODIFY_ACK(template (value) RslChannelNr chan_nr) := {