diff --git a/src/encoding.h b/src/encoding.h
new file mode 100644
index 0000000..d0f8f0a
--- /dev/null
+++ b/src/encoding.h
@@ -0,0 +1,66 @@
+/* encoding.cpp
+ *
+ * Copyright (C) 2012 Ivan Klyuchnikov
+ * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
+ * Copyright (C) 2013 by Holger Hans Peter Freyther
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#pragma once
+
+#include <stdint.h>
+#include <gsm_rlcmac.h>
+
+struct gprs_rlcmac_bts;
+struct gprs_rlcmac_tbf;
+struct bitvec;
+
+/**
+ * I help with encoding data into CSN1 messages.
+ * TODO: Nobody can remember a function signature like this. One should
+ * fill out a struct with the request parameters and then hand the struct
+ * to the code.
+ */
+class Encoding {
+public:
+	static int write_immediate_assignment(
+			struct gprs_rlcmac_bts *bts,
+			bitvec * dest, uint8_t downlink, uint8_t ra, 
+		        uint32_t ref_fn, uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc, 
+		        uint8_t tfi, uint8_t usf, uint32_t tlli, uint8_t polling,
+			uint32_t fn, uint8_t single_block, uint8_t alpha, uint8_t gamma,
+			int8_t ta_idx);
+
+	static void write_packet_uplink_assignment(
+			struct gprs_rlcmac_bts *bts,
+			bitvec * dest, uint8_t old_tfi,
+			uint8_t old_downlink, uint32_t tlli, uint8_t use_tlli, 
+			struct gprs_rlcmac_tbf *tbf, uint8_t poll, uint8_t alpha,
+			uint8_t gamma, int8_t ta_idx);
+
+	static void write_packet_downlink_assignment(RlcMacDownlink_t * block, uint8_t old_tfi,
+			uint8_t old_downlink, struct gprs_rlcmac_tbf *tbf, uint8_t poll,
+			uint8_t alpha, uint8_t gamma, int8_t ta_idx, uint8_t ta_ts);
+
+	static void write_packet_uplink_ack(struct gprs_rlcmac_bts *bts, RlcMacDownlink_t * block, struct gprs_rlcmac_tbf *tbf,
+		        uint8_t final);
+
+	static int write_paging_request(bitvec * dest, uint8_t *ptmsi, uint16_t ptmsi_len);
+
+	static unsigned write_repeated_page_info(bitvec * dest, unsigned& wp, uint8_t len,
+			uint8_t *identity, uint8_t chan_needed);
+
+	static unsigned write_packet_paging_request(bitvec * dest);
+};