diff --git a/library/BSSGP_Emulation.ttcn b/library/BSSGP_Emulation.ttcn
index a26e01f..9a48918 100644
--- a/library/BSSGP_Emulation.ttcn
+++ b/library/BSSGP_Emulation.ttcn
@@ -40,6 +40,7 @@
 /* port from our (internal) point of view */
 type port BSSGP_SP_PT message {
 	in	PDU_BSSGP,
+		PDU_LLC,
 		PDU_L3_MS_SGSN,
 		PDU_L3_SGSN_MS;
 	out	BssgpDecoded,
@@ -59,6 +60,7 @@
 		PDU_L3_MS_SGSN,
 		PDU_L3_SGSN_MS;
 	out	PDU_BSSGP,
+		PDU_LLC,
 		PDU_L3_SGSN_MS,
 		PDU_L3_MS_SGSN;
 } with { extension "internal" };
@@ -467,6 +469,7 @@
 	var BSSGP_Client_CT vc_conn;
 	var NsUnitdataIndication udi;
 	var PDU_BSSGP bs_pdu;
+	var PDU_LLC llc;
 	var PDU_L3_MS_SGSN l3_mo;
 	var PDU_L3_SGSN_MS l3_mt;
 
@@ -543,7 +546,6 @@
 		var octetstring llc_enc := enc_PDU_LLC(valueof(ts_LLC_UI(l3_enc, sapi, '0'B, n_u)));
 		BSCP.send(f_BnsUdReq(ts_BSSGP_UL_UD(ClientTable[idx].tlli, ClientTable[idx].cell_id, llc_enc), g_cfg.bvci));
 	}
-
 	[g_cfg.sgsn_role] BSSGP_SP.receive(PDU_L3_SGSN_MS:?) -> value l3_mt sender vc_conn {
 		var integer idx := f_tbl_idx_by_comp(vc_conn);
 		var octetstring l3_enc := enc_PDU_L3_SGSN_MS(l3_mt);
@@ -552,6 +554,12 @@
 		var octetstring llc_enc := enc_PDU_LLC(valueof(ts_LLC_UI(l3_enc, sapi, '1'B, n_u)));
 		//BSCP.send(f_BnsUdReq(ts_BSSGP_DL_UD(ClientTable[idx].tlli, ClientTable[idx].cell_id, llc_enc)), g_cfg.bvci);
 	}
+
+	[] BSSGP_SP.receive(PDU_LLC:?) -> value llc sender vc_conn {
+		var integer idx := f_tbl_idx_by_comp(vc_conn);
+		var octetstring llc_enc := enc_PDU_LLC(llc);
+		BSCP.send(f_BnsUdReq(ts_BSSGP_UL_UD(ClientTable[idx].tlli, ClientTable[idx].cell_id, llc_enc), g_cfg.bvci));
+	}
 }
 
 private function f_llc_get_n_u_tx(inout LLC_Entity llc) return uint9_t {