diff --git a/srsue/test/ttcn3/hdr/ttcn3_helpers.h b/srsue/test/ttcn3/hdr/ttcn3_helpers.h
index d1785f2cf..a4d7ba4c7 100644
--- a/srsue/test/ttcn3/hdr/ttcn3_helpers.h
+++ b/srsue/test/ttcn3/hdr/ttcn3_helpers.h
@@ -407,6 +407,77 @@ public:
     return config_flag.GetBool();
   }
 
+  static std::string
+  get_rrc_pdu_ind_for_pdu(uint32_t tti, uint32_t lcid, const std::string cell_, srslte::unique_byte_buffer_t pdubuf)
+  {
+    Document resp;
+    resp.SetObject();
+
+    // Create members of common object
+
+    // CellId
+    Value cell(cell_.c_str(), resp.GetAllocator());
+
+    // RoutingInfo
+    Value radiobearer_id(kObjectType);
+    radiobearer_id.AddMember("Srb", lcid, resp.GetAllocator());
+    Value routing_info(kObjectType);
+    routing_info.AddMember("RadioBearerId", radiobearer_id, resp.GetAllocator());
+
+    // TimingInfo
+    // SFN
+    uint32_t sfn = tti / 10;
+    Value    sfn_key(kObjectType);
+    sfn_key.AddMember("Number", sfn, resp.GetAllocator());
+
+    // Actual subframe index
+    uint32_t sf_idx = tti % 10;
+    Value    sf_idx_key(kObjectType);
+    sf_idx_key.AddMember("Number", sf_idx, resp.GetAllocator());
+
+    // Put it all together
+    Value subframe_key(kObjectType);
+    subframe_key.AddMember("SFN", sfn_key, resp.GetAllocator());
+    subframe_key.AddMember("Subframe", sf_idx_key, resp.GetAllocator());
+
+    Value timing_info(kObjectType);
+    timing_info.AddMember("SubFrame", subframe_key, resp.GetAllocator());
+
+    // Status
+    Value status(kObjectType);
+    status.AddMember("Ok", true, resp.GetAllocator());
+
+    // Now, create the common object itself and add members
+    Value common(kObjectType);
+    common.AddMember("CellId", cell, resp.GetAllocator());
+    common.AddMember("RoutingInfo", routing_info, resp.GetAllocator());
+    common.AddMember("TimingInfo", timing_info, resp.GetAllocator());
+    common.AddMember("Status", status, resp.GetAllocator());
+
+    resp.AddMember("Common", common, resp.GetAllocator());
+
+    // Add RRC PDU
+    std::string hexpdu = asn1::octstring_to_string(pdubuf->msg, pdubuf->N_bytes);
+    Value       pdu(hexpdu.c_str(), resp.GetAllocator());
+
+    Value rrcpdu(kObjectType);
+    if (lcid == 0) {
+      rrcpdu.AddMember("Ccch", pdu, resp.GetAllocator());
+    } else {
+      rrcpdu.AddMember("Dcch", pdu, resp.GetAllocator());
+    }
+
+    resp.AddMember("RrcPdu", rrcpdu, resp.GetAllocator());
+
+    // JSON-ize
+    StringBuffer         buffer;
+    Writer<StringBuffer> writer(buffer);
+    resp.Accept(writer);
+
+    // Return as std::string
+    return std::string(buffer.GetString());
+  }
+
   static std::string
   get_drb_common_ind_for_pdu(uint32_t tti, uint32_t lcid, const std::string cell_, srslte::unique_byte_buffer_t drbpdu)
   {
diff --git a/srsue/test/ttcn3/hdr/ttcn3_srb_interface.h b/srsue/test/ttcn3/hdr/ttcn3_srb_interface.h
index 0a83ff219..73c2d7717 100644
--- a/srsue/test/ttcn3/hdr/ttcn3_srb_interface.h
+++ b/srsue/test/ttcn3/hdr/ttcn3_srb_interface.h
@@ -49,11 +49,12 @@ public:
     return port_listen();
   }
 
-  void tx(unique_byte_buffer_t pdu)
+  void tx(std::string out)
   {
     if (initialized) {
-      log->info_hex(pdu->msg, pdu->N_bytes, "Sending %d B to Titan\n", pdu->N_bytes);
-      send(pdu->msg, pdu->N_bytes);
+      log->info_hex(
+          reinterpret_cast<const uint8_t*>(out.c_str()), out.length(), "Sending %ld B to Titan\n", out.length());
+      send(reinterpret_cast<const uint8_t*>(out.c_str()), out.length());
     } else {
       log->error("Trying to transmit but port not connected.\n");
     }
diff --git a/srsue/test/ttcn3/src/ttcn3_syssim.cc b/srsue/test/ttcn3/src/ttcn3_syssim.cc
index 720a4b260..3d1a972d5 100644
--- a/srsue/test/ttcn3/src/ttcn3_syssim.cc
+++ b/srsue/test/ttcn3/src/ttcn3_syssim.cc
@@ -1025,23 +1025,9 @@ void ttcn3_syssim::write_pdu(uint32_t lcid, unique_byte_buffer_t pdu)
 
   // push content to Titan
   if (lcid <= 2) {
-    // check cell ID
-    if (cells[pcell_idx]->cell.id > 256) {
-      log->error("Cell ID too large to fit in single byte.\n");
-      return;
-    }
+    std::string out = ttcn3_helpers::get_rrc_pdu_ind_for_pdu(tti, lcid, cells[pcell_idx]->name, std::move(pdu));
 
-    // We don't handle RRC, prepend LCID
-    pdu->msg--;
-    *pdu->msg = lcid;
-    pdu->N_bytes++;
-
-    // prepend pcell PCID
-    pdu->msg--;
-    *pdu->msg = static_cast<uint8_t>(cells[pcell_idx]->cell.id);
-    pdu->N_bytes++;
-
-    srb.tx(std::move(pdu));
+    srb.tx(out);
   } else {
     std::string out = ttcn3_helpers::get_drb_common_ind_for_pdu(tti, lcid, cells[pcell_idx]->name, std::move(pdu));
     log->error("DRB send:\n%s", out.c_str());