diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index fddfcca..f59cc89 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -5812,8 +5812,17 @@
 	f_l1_tune(L1CTL);
 
 	f_TC_pcu_act_req(0, 0, 7, true);
-	/* three characters prefix: last 3 digits of IMSI as ASCII */
-	f_pcu_data_req(0, 0, 7, 0, 0, PCU_IF_SAPI_PCH, '313233'O & c_PCU_DATA);
+
+	if (mp_pcuif_version < 11) {
+		/* three characters prefix: last 3 digits of IMSI as ASCII */
+		f_pcu_data_req(0, 0, 7, 0, 0, PCU_IF_SAPI_PCH, '313233'O & c_PCU_DATA);
+	} else {
+		var PCUIF_pch_dt pch_dt;
+		pch_dt.tlli := '01020304'O;
+		pch_dt.imsi := "00101000000000123";
+		pch_dt.data := c_PCU_DATA;
+		f_pcu_data_req(0, 0, 7, 0, 0, PCU_IF_SAPI_PCH_DT, enc_PCUIF_pch_dt(pch_dt));
+	}
 
 	T.start;
 	alt {
diff --git a/library/PCUIF_CodecPort.ttcn b/library/PCUIF_CodecPort.ttcn
index f3e4810..0f850e9 100644
--- a/library/PCUIF_CodecPort.ttcn
+++ b/library/PCUIF_CodecPort.ttcn
@@ -15,6 +15,7 @@
 import from PCUIF_Types all;
 import from UD_PortType all;
 import from UD_Types all;
+import from General_Types all;
 
 type record PCUIF_send_data {
 	PCUIF_Message	data,
@@ -139,18 +140,27 @@
 }
 
 function f_PCUIF_tx_imm_ass_pch(PCUIF_CODEC_PT pt, integer conn_id, octetstring imm_ass, hexstring imsi,
-				uint8_t bts_nr := 0, boolean wait_for_cnf := true) return uint32_t {
+				uint8_t bts_nr := 0, boolean wait_for_cnf := true, OCT4 tlli := '01020304'O) return uint32_t {
 	var PCUIF_send_data sd;
 	timer T := 3.0;
-	/* append 3 last imsi digits so BTS can compute pagng group */
-	var hexstring last_digits := substr(imsi, lengthof(imsi)-3, 3);
-	var octetstring prefix := ''O;
-	log("3 last imsi digits: ", last_digits);
-	for (var integer i := 0; i < 3; i := i+1) {
-		prefix := prefix & int2oct(hex2int('30'H) + hex2int(last_digits[i]), 1);
-	}
-	pt.send(t_SD_PCUIF(conn_id,
+
+	if (mp_pcuif_version < 11) {
+		/* append 3 last imsi digits so that the BTS is able to compute paging group */
+		var hexstring last_digits := substr(imsi, lengthof(imsi)-3, 3);
+		log("3 last imsi digits: ", last_digits);
+		var octetstring prefix := ''O;
+		for (var integer i := 0; i < 3; i := i+1) {
+			prefix := prefix & int2oct(hex2int('30'H) + hex2int(last_digits[i]), 1);
+		}
+		pt.send(t_SD_PCUIF(conn_id,
 			ts_PCUIF_DATA_REQ(bts_nr, 0, 0, 0, 0, PCU_IF_SAPI_PCH, prefix & imm_ass)));
+	} else {
+		var PCUIF_pch_dt pch_dt;
+		pch_dt.tlli := tlli;
+		pch_dt.imsi := hex2str(imsi);
+		pch_dt.data := imm_ass;
+		pt.send(t_SD_PCUIF(conn_id, ts_PCUIF_DATA_REQ(bts_nr, 0, 0, 0, 0, PCU_IF_SAPI_PCH_DT, enc_PCUIF_pch_dt(pch_dt))));
+	}
 
 	/* Exit early when the caller is not interested in the confirmation message */
 	if (wait_for_cnf == false) {
@@ -159,10 +169,23 @@
 
 	T.start;
 	alt {
-	[] pt.receive(t_SD_PCUIF(conn_id,
-				tr_PCUIF_DATA_CNF(bts_nr, 0, 0, PCU_IF_SAPI_PCH))) -> value sd {
-		log("IMM.ASS was sent on fn ", sd.data.u.data_cnf.fn);
-		return sd.data.u.data_cnf.fn;
+	[] pt.receive(t_SD_PCUIF(conn_id, tr_PCUIF_DATA_CNF(bts_nr, 0, 0, PCU_IF_SAPI_PCH))) -> value sd {
+		if (mp_pcuif_version >= 11) {
+			setverdict(fail, "expecting tr_PCUIF_DATA_CNF_DT in PCUIF v.11 or later");
+			mtc.stop;
+		} else {
+			log("IMM.ASS was sent on fn ", sd.data.u.data_cnf.fn);
+			return sd.data.u.data_cnf.fn;
+		}
+		}
+	[] pt.receive(t_SD_PCUIF(conn_id, tr_PCUIF_DATA_CNF_DT(bts_nr, 0, 0, PCU_IF_SAPI_PCH_DT))) -> value sd {
+		if (mp_pcuif_version < 11) {
+			setverdict(fail, "expecting tr_PCUIF_DATA_CNF in PCUIF v.10 or earlier");
+			mtc.stop;
+		} else {
+			log("IMM.ASS was sent on fn ", sd.data.u.data_cnf_dt.fn);
+			return sd.data.u.data_cnf_dt.fn;
+		}
 		}
 	[] pt.receive { repeat; }
 	[] T.timeout {
diff --git a/library/PCUIF_Types.ttcn b/library/PCUIF_Types.ttcn
index 8f5d4eb..65d0c41 100644
--- a/library/PCUIF_Types.ttcn
+++ b/library/PCUIF_Types.ttcn
@@ -17,11 +17,11 @@
 
 modulepar {
 	/* PCUIF version supported by the IUT */
-	PCUIF_Version mp_pcuif_version := 10;
+	PCUIF_Version mp_pcuif_version := 11;
 };
 
 const charstring PCU_SOCK_DEFAULT := "/tmp/pcu_bts";
-type integer PCUIF_Version (9..10); /* supported versions */
+type integer PCUIF_Version (9..11); /* supported versions */
 
 type enumerated PCUIF_MsgType {
 	PCU_IF_MSG_DATA_REQ		('00'O),
@@ -324,6 +324,9 @@
 	variant (data) "FIELDLENGTH(23)"
 };
 
+external function enc_PCUIF_pch_dt(in PCUIF_pch_dt pdu) return octetstring
+	with { extension "prototype(convert) encode(RAW)" };
+
 type union PCUIF_MsgUnion {
 	PCUIF_data		data_req,
 	PCUIF_data		data_cnf,
@@ -374,7 +377,6 @@
 external function dec_PCUIF_Message(in octetstring stream) return PCUIF_Message
 	with { extension "prototype(convert) decode(RAW)" };
 
-
 /* Generic template for matching messages by type and/or the BTS number */
 template PCUIF_Message tr_PCUIF_MSG(template PCUIF_MsgType msg_type := ?,
 				    template uint8_t bts_nr := ?) := {