diff --git a/srsue/test/ttcn3/hdr/ttcn3_drb_interface.h b/srsue/test/ttcn3/hdr/ttcn3_drb_interface.h
index 529e76480..a5c315d55 100644
--- a/srsue/test/ttcn3/hdr/ttcn3_drb_interface.h
+++ b/srsue/test/ttcn3/hdr/ttcn3_drb_interface.h
@@ -85,11 +85,53 @@ private:
     document.Accept(writer);
     log->info("Received JSON with %d B\n%s\n", json_len, (char*)buffer.GetString());
 
-    // TODO: call handler
+    // check for common
+    assert(document.HasMember("Common"));
+    assert(document["Common"].IsObject());
+
+    // Check for user data
+    assert(document.HasMember("U_Plane"));
+    assert(document["U_Plane"].IsObject());
+
+    // Handle Pdus
+    const Value& uplane = document["U_Plane"];
+    assert(uplane.HasMember("SubframeDataList"));
+    assert(uplane["SubframeDataList"].IsArray());
+
+    uint32_t lcid = document["Common"]["RoutingInfo"]["RadioBearerId"]["Drb"].GetInt() + 2;
+
+    for (auto& sfdata : uplane["SubframeDataList"].GetArray()) {
+      assert(sfdata.HasMember("PduSduList"));
+      assert(sfdata["PduSduList"].IsObject());
+      assert(sfdata["PduSduList"].HasMember("PdcpSdu"));
+      assert(sfdata["PduSduList"]["PdcpSdu"].IsArray());
+
+      const Value& sdulist = sfdata["PduSduList"]["PdcpSdu"];
+      for (auto& sdu : sdulist.GetArray()) {
+        assert(sdu.IsString());
+        string              sdustr = sdu.GetString();
+        asn1::dyn_octstring octstr(sdustr.size());
+        octstr.from_string(sdustr);
+
+        handle_sdu(document, lcid, octstr.data(), octstr.size(), ttcn3_helpers::get_follow_on_flag(document));
+      }
+    }
 
     return SRSLTE_SUCCESS;
   }
 
+  void handle_sdu(Document& document, const uint16_t lcid, const uint8_t* payload, const uint16_t len, bool follow_on)
+  {
+    log->info_hex(payload, len, "Received DRB PDU (lcid=%d)\n", lcid);
+
+    // pack into byte buffer
+    unique_byte_buffer_t pdu = pool_allocate_blocking;
+    pdu->N_bytes             = len;
+    memcpy(pdu->msg, payload, pdu->N_bytes);
+
+    syssim->add_dcch_pdu(ttcn3_helpers::get_timing_info(document), lcid, std::move(pdu), follow_on);
+  }
+
   ss_srb_interface* syssim = nullptr;
   byte_buffer_pool* pool   = nullptr;
 };
diff --git a/srsue/test/ttcn3/hdr/ttcn3_interfaces.h b/srsue/test/ttcn3/hdr/ttcn3_interfaces.h
index 98e42a0dd..64440994d 100644
--- a/srsue/test/ttcn3/hdr/ttcn3_interfaces.h
+++ b/srsue/test/ttcn3/hdr/ttcn3_interfaces.h
@@ -58,6 +58,9 @@ public:
   virtual void
                add_srb(const ttcn3_helpers::timing_info_t timing, const uint32_t lcid, const srslte::pdcp_config_t pdcp_config) = 0;
   virtual void del_srb(const ttcn3_helpers::timing_info_t timing, const uint32_t lcid) = 0;
+  virtual void
+               add_drb(const ttcn3_helpers::timing_info_t timing, const uint32_t lcid, const srslte::pdcp_config_t pdcp_config) = 0;
+  virtual void del_drb(const ttcn3_helpers::timing_info_t timing, const uint32_t lcid) = 0;
 
   virtual void                            set_as_security(const ttcn3_helpers::timing_info_t        timing,
                                                           const std::array<uint8_t, 32>             k_rrc_enc,
@@ -104,4 +107,4 @@ public:
   virtual void     new_tb(const srsue::mac_interface_phy_lte::mac_grant_dl_t mac_grant, const uint8_t* data) = 0;
 };
 
-#endif // SRSUE_TTCN3_INTERFACES_H
\ No newline at end of file
+#endif // SRSUE_TTCN3_INTERFACES_H
diff --git a/srsue/test/ttcn3/hdr/ttcn3_sys_interface.h b/srsue/test/ttcn3/hdr/ttcn3_sys_interface.h
index f0f9128fe..b74291d4f 100644
--- a/srsue/test/ttcn3/hdr/ttcn3_sys_interface.h
+++ b/srsue/test/ttcn3/hdr/ttcn3_sys_interface.h
@@ -316,9 +316,22 @@ private:
         }
       } else if (id.HasMember("Drb")) {
         log->info("Configure DRB%d\n", id["Drb"].GetInt());
-      }
 
-      // TODO: actually do configuration
+        const Value& config = (*itr)["Config"];
+        if (config.HasMember("AddOrReconfigure")) {
+          const Value& aor  = config["AddOrReconfigure"];
+          uint32_t     lcid = aor["LogicalChannelId"].GetInt();
+          if (lcid > 0) {
+            pdcp_config_t pdcp_cfg = make_drb_pdcp_config_t(static_cast<uint8_t>(lcid), false);
+            syssim->add_drb(ttcn3_helpers::get_timing_info(document), lcid, pdcp_cfg);
+          }
+        } else if (config.HasMember("Release")) {
+          uint32_t lcid = id["Drb"].GetInt() + 2;
+          syssim->del_drb(ttcn3_helpers::get_timing_info(document), lcid);
+        } else {
+          log->error("Unknown config.\n");
+        }
+      }
     }
 
     std::string resp = ttcn3_helpers::get_basic_sys_req_cnf(cell_id.GetString(), "RadioBearerList");
diff --git a/srsue/test/ttcn3/hdr/ttcn3_syssim.h b/srsue/test/ttcn3/hdr/ttcn3_syssim.h
index c9dc22cee..2fada7cc4 100644
--- a/srsue/test/ttcn3/hdr/ttcn3_syssim.h
+++ b/srsue/test/ttcn3/hdr/ttcn3_syssim.h
@@ -152,15 +152,18 @@ public:
   void step_stack();
 
   void add_srb(const ttcn3_helpers::timing_info_t timing, const uint32_t lcid, const pdcp_config_t pdcp_config);
-
   void add_srb_impl(const uint32_t lcid, const pdcp_config_t pdcp_config);
 
   void reestablish_bearer(uint32_t lcid);
 
   void del_srb(const ttcn3_helpers::timing_info_t timing, const uint32_t lcid);
-
   void del_srb_impl(uint32_t lcid);
 
+  void add_drb(const ttcn3_helpers::timing_info_t timing, const uint32_t lcid, const pdcp_config_t pdcp_config);
+  void add_drb_impl(const uint32_t lcid, const pdcp_config_t pdcp_config);
+  void del_drb(const ttcn3_helpers::timing_info_t timing, const uint32_t lcid);
+  void del_drb_impl(uint32_t lcid);
+
   // RRC interface for PDCP, PDCP calls RRC to push RRC SDU
   void write_pdu(uint32_t lcid, unique_byte_buffer_t pdu);
 
diff --git a/srsue/test/ttcn3/src/ttcn3_syssim.cc b/srsue/test/ttcn3/src/ttcn3_syssim.cc
index 6baba95f3..2d2f9d123 100644
--- a/srsue/test/ttcn3/src/ttcn3_syssim.cc
+++ b/srsue/test/ttcn3/src/ttcn3_syssim.cc
@@ -972,6 +972,47 @@ void ttcn3_syssim::del_srb_impl(uint32_t lcid)
   }
 }
 
+void ttcn3_syssim::add_drb(const ttcn3_helpers::timing_info_t timing,
+                           const uint32_t                     lcid,
+                           const srslte::pdcp_config_t        pdcp_config)
+{
+  if (timing.now) {
+    add_drb_impl(lcid, pdcp_config);
+  } else {
+    log->debug("Scheduling DRB%d addition for TTI=%d\n", lcid - 2, timing.tti);
+    tti_actions[timing.tti].push_back([this, lcid, pdcp_config]() { add_drb_impl(lcid, pdcp_config); });
+  }
+}
+
+void ttcn3_syssim::add_drb_impl(const uint32_t lcid, const pdcp_config_t pdcp_config)
+{
+  if (lcid > 2) {
+    log->info("Adding DRB%d\n", lcid - 2);
+    pdcp.add_bearer(lcid, pdcp_config);
+    rlc.add_bearer(lcid, srslte::rlc_config_t::default_rlc_am_config());
+  }
+}
+
+void ttcn3_syssim::del_drb(const ttcn3_helpers::timing_info_t timing, const uint32_t lcid)
+{
+  if (timing.now) {
+    del_drb_impl(lcid);
+  } else {
+    log->debug("Scheduling DRB%d deletion for TTI=%d\n", lcid - 2, timing.tti);
+    tti_actions[timing.tti].push_back([this, lcid]() { del_drb_impl(lcid); });
+  }
+}
+
+void ttcn3_syssim::del_drb_impl(uint32_t lcid)
+{
+  // Only delete DRB
+  if (lcid > 2) {
+    log->info("Deleting DRB%d\n", lcid - 2);
+    pdcp.del_bearer(lcid);
+    rlc.del_bearer(lcid);
+  }
+}
+
 // RRC interface for PDCP, PDCP calls RRC to push RRC SDU
 void ttcn3_syssim::write_pdu(uint32_t lcid, unique_byte_buffer_t pdu)
 {
@@ -999,7 +1040,11 @@ void ttcn3_syssim::write_pdu(uint32_t lcid, unique_byte_buffer_t pdu)
   pdu->N_bytes++;
 
   // push content to Titan
-  srb.tx(std::move(pdu));
+  if (lcid <= 2) {
+    srb.tx(std::move(pdu));
+  } else {
+    drb.tx(std::move(pdu));
+  }
 }
 
 // Not supported right now