diff --git a/lib/include/srslte/interfaces/ue_interfaces.h b/lib/include/srslte/interfaces/ue_interfaces.h
index 9bc175fb9..ee6a7253f 100644
--- a/lib/include/srslte/interfaces/ue_interfaces.h
+++ b/lib/include/srslte/interfaces/ue_interfaces.h
@@ -552,7 +552,7 @@ public:
   virtual void set_timeadv(uint32_t ta_cmd)     = 0;
 
   /* Activate / Disactivate SCell*/
-  virtual void set_activation_deactivation_scell(uint32_t cmd) = 0;
+  virtual void set_activation_deactivation_scell(uint32_t cmd, uint32_t tti) = 0;
 
   /* Sets RAR dci payload */
   virtual void set_rar_grant(uint8_t grant_payload[SRSLTE_RAR_GRANT_LEN], uint16_t rnti) = 0;
@@ -595,7 +595,7 @@ public:
   virtual void set_config_mbsfn_sib13(const srslte::sib13_t& sib13)                       = 0;
   virtual void set_config_mbsfn_mcch(const srslte::mcch_msg_t& mcch)                      = 0;
 
-  virtual void set_activation_deactivation_scell(uint32_t cmd) = 0;
+  virtual void deactivate_scells() = 0;
 
   /* Measurements interface */
   virtual void set_cells_to_meas(uint32_t earfcn, const std::set<uint32_t>& pci) = 0;
diff --git a/lib/include/srslte/test/ue_test_interfaces.h b/lib/include/srslte/test/ue_test_interfaces.h
index ba5ed2b9a..6834261b7 100644
--- a/lib/include/srslte/test/ue_test_interfaces.h
+++ b/lib/include/srslte/test/ue_test_interfaces.h
@@ -73,7 +73,7 @@ class phy_dummy_interface : public phy_interface_rrc_lte
   void set_config_mbsfn_sib2(srslte::mbsfn_sf_cfg_t* cfg_list, uint32_t nof_cfgs) override {}
   void set_config_mbsfn_sib13(const srslte::sib13_t& sib13) override {}
   void set_config_mbsfn_mcch(const srslte::mcch_msg_t& mcch) override {}
-  void set_activation_deactivation_scell(uint32_t cmd) override {}
+  void deactivate_scells() override {}
 
   /* Measurements interface */
   void set_cells_to_meas(uint32_t earfcn, const std::set<uint32_t>& pci) override {}
diff --git a/srsue/hdr/phy/phy.h b/srsue/hdr/phy/phy.h
index 702986a47..481c12f1c 100644
--- a/srsue/hdr/phy/phy.h
+++ b/srsue/hdr/phy/phy.h
@@ -145,7 +145,8 @@ public:
   void set_timeadv(uint32_t ta_cmd) final;
 
   /* Activate / Disactivate SCell*/
-  void set_activation_deactivation_scell(uint32_t ta_cmd) final;
+  void deactivate_scells() final;
+  void set_activation_deactivation_scell(uint32_t cmd, uint32_t tti) final;
 
   /* Sets RAR dci payload */
   void set_rar_grant(uint8_t grant_payload[SRSLTE_RAR_GRANT_LEN], uint16_t rnti) final;
diff --git a/srsue/hdr/stack/mac/demux.h b/srsue/hdr/stack/mac/demux.h
index 510e0499c..5f2bfde2e 100644
--- a/srsue/hdr/stack/mac/demux.h
+++ b/srsue/hdr/stack/mac/demux.h
@@ -54,7 +54,7 @@ public:
   uint8_t* request_buffer_bcch(uint32_t len);
   void     deallocate(uint8_t* payload_buffer_ptr);
 
-  void push_pdu(uint8_t* buff, uint32_t nof_bytes);
+  void push_pdu(uint8_t* buff, uint32_t nof_bytes, uint32_t tti);
   void push_pdu_bcch(uint8_t* buff, uint32_t nof_bytes);
   void push_pdu_mch(uint8_t* buff, uint32_t nof_bytes);
   void push_pdu_temp_crnti(uint8_t* buff, uint32_t nof_bytes);
@@ -79,10 +79,10 @@ private:
   srslte::mch_pdu mch_mac_msg;
   srslte::sch_pdu pending_mac_msg;
   uint8_t         mch_lcids[SRSLTE_N_MCH_LCIDS] = {};
-  void            process_sch_pdu_rt(uint8_t* buff, uint32_t nof_bytes);
+  void            process_sch_pdu_rt(uint8_t* buff, uint32_t nof_bytes, uint32_t tti);
   void            process_sch_pdu(srslte::sch_pdu* pdu);
   void            process_mch_pdu(srslte::mch_pdu* pdu);
-  bool            process_ce(srslte::sch_subh* subheader);
+  bool            process_ce(srslte::sch_subh* subheader, uint32_t tti);
   void            parse_ta_cmd(srslte::sch_subh* subh);
 
   bool is_uecrid_successful = false;
diff --git a/srsue/src/phy/phy.cc b/srsue/src/phy/phy.cc
index 7840f4db6..1d903b67b 100644
--- a/srsue/src/phy/phy.cc
+++ b/srsue/src/phy/phy.cc
@@ -267,7 +267,14 @@ void phy::set_timeadv(uint32_t ta_cmd)
   common.ta.add_ta_cmd_new(ta_cmd);
 }
 
-void phy::set_activation_deactivation_scell(uint32_t cmd)
+void phy::deactivate_scells()
+{
+  for (uint32_t i = 1; i < SRSLTE_MAX_CARRIERS; i++) {
+    common.enable_scell(i, false);
+  }
+}
+
+void phy::set_activation_deactivation_scell(uint32_t cmd, uint32_t tti)
 {
   /* Implements 3GPP 36.321 section 6.1.3.8. Activation/Deactivation MAC Control Element*/
   for (uint32_t i = 1; i < SRSLTE_MAX_CARRIERS; i++) {
diff --git a/srsue/src/stack/mac/demux.cc b/srsue/src/stack/mac/demux.cc
index 603dad96e..093156545 100644
--- a/srsue/src/stack/mac/demux.cc
+++ b/srsue/src/stack/mac/demux.cc
@@ -125,11 +125,11 @@ void demux::push_pdu_temp_crnti(uint8_t* buff, uint32_t nof_bytes)
  * This function enqueues the packet and returns quickly because ACK
  * deadline is important here.
  */
-void demux::push_pdu(uint8_t* buff, uint32_t nof_bytes)
+void demux::push_pdu(uint8_t* buff, uint32_t nof_bytes, uint32_t tti)
 {
 
   // Process Real-Time PDUs
-  process_sch_pdu_rt(buff, nof_bytes);
+  process_sch_pdu_rt(buff, nof_bytes, tti);
 
   return pdus.push(buff, nof_bytes, srslte::pdu_queue::DCH);
 }
@@ -180,7 +180,7 @@ void demux::process_pdu(uint8_t* mac_pdu, uint32_t nof_bytes, srslte::pdu_queue:
   }
 }
 
-void demux::process_sch_pdu_rt(uint8_t* buff, uint32_t nof_bytes)
+void demux::process_sch_pdu_rt(uint8_t* buff, uint32_t nof_bytes, uint32_t tti)
 {
   srslte::sch_pdu mac_msg_rt(20, log_h);
 
@@ -192,7 +192,7 @@ void demux::process_sch_pdu_rt(uint8_t* buff, uint32_t nof_bytes)
       // Ignore SDU
     } else {
       // Process MAC Control Element
-      if (!process_ce(mac_msg_rt.get())) {
+      if (!process_ce(mac_msg_rt.get(), tti)) {
         Warning("Received Subheader with invalid or unknown LCID\n");
       }
     }
@@ -274,7 +274,7 @@ void demux::mch_start_rx(uint32_t lcid)
   }
 }
 
-bool demux::process_ce(srslte::sch_subh* subh)
+bool demux::process_ce(srslte::sch_subh* subh, uint32_t tti)
 {
   switch (subh->dl_sch_ce_type()) {
     case srslte::dl_sch_lcid::CON_RES_ID:
@@ -287,7 +287,7 @@ bool demux::process_ce(srslte::sch_subh* subh)
       uint32_t cmd = (uint32_t)subh->get_activation_deactivation_cmd();
       srslte::console("SCELL Activation / Deactivation CMD: %x\n", cmd);
       log_h->info("SCELL Activation / Deactivation CMD: %x\n", cmd);
-      phy_h->set_activation_deactivation_scell(cmd);
+      phy_h->set_activation_deactivation_scell(cmd, tti);
       break;
     }
     case srslte::dl_sch_lcid::PADDING:
diff --git a/srsue/src/stack/mac/dl_harq.cc b/srsue/src/stack/mac/dl_harq.cc
index 2f3a40cd1..0f61678ad 100644
--- a/srsue/src/stack/mac/dl_harq.cc
+++ b/srsue/src/stack/mac/dl_harq.cc
@@ -341,7 +341,7 @@ void dl_harq_entity::dl_harq_process::dl_tb_process::tb_decoded(mac_interface_ph
 
         } else {
           Debug("Delivering PDU=%d bytes to Dissassemble and Demux unit\n", cur_grant.tb[tid].tbs);
-          harq_entity->demux_unit->push_pdu(payload_buffer_ptr, cur_grant.tb[tid].tbs);
+          harq_entity->demux_unit->push_pdu(payload_buffer_ptr, cur_grant.tb[tid].tbs, grant.tti);
 
           // Compute average number of retransmissions per packet
           harq_entity->average_retx = SRSLTE_VEC_CMA((float)n_retx, harq_entity->average_retx, harq_entity->nof_pkts++);
diff --git a/srsue/src/stack/rrc/rrc_procedures.cc b/srsue/src/stack/rrc/rrc_procedures.cc
index 72c6160e1..8493c069e 100644
--- a/srsue/src/stack/rrc/rrc_procedures.cc
+++ b/srsue/src/stack/rrc/rrc_procedures.cc
@@ -1332,7 +1332,7 @@ proc_outcome_t rrc::connection_reest_proc::init(asn1::rrc::reest_cause_e cause)
 
   // configure lower layers to consider the SCell(s), if configured, to be in deactivated state;
   if (nof_scells_active > 0) {
-    rrc_ptr->phy->set_activation_deactivation_scell(0);
+    rrc_ptr->phy->deactivate_scells();
   }
 
   // 1> apply the default physical channel configuration as specified in 9.2.4;
@@ -1596,7 +1596,7 @@ srslte::proc_outcome_t rrc::ho_proc::init(const asn1::rrc::rrc_conn_recfg_s& rrc
 
   // configure lower layers to consider the SCell(s), if configured, to be in deactivated state;
   if (nof_scells_active > 0) {
-    rrc_ptr->phy->set_activation_deactivation_scell(0);
+    rrc_ptr->phy->deactivate_scells();
   }
 
   // apply the value of the newUE-Identity as the C-RNTI;
diff --git a/srsue/test/mac_test.cc b/srsue/test/mac_test.cc
index 8d046370c..27f247f87 100644
--- a/srsue/test/mac_test.cc
+++ b/srsue/test/mac_test.cc
@@ -163,7 +163,7 @@ public:
   void set_crnti(uint16_t rnti) { last_crnti = rnti; }
   void set_timeadv_rar(uint32_t ta_cmd) { rar_time_adv = ta_cmd; }
   void set_timeadv(uint32_t ta_cmd){};
-  void set_activation_deactivation_scell(uint32_t cmd) { scell_cmd = cmd; };
+  void set_activation_deactivation_scell(uint32_t cmd, uint32_t tti) override { scell_cmd = cmd; };
   void set_rar_grant(uint8_t grant_payload[SRSLTE_RAR_GRANT_LEN], uint16_t rnti)
   {
     memcpy(rar_payload, grant_payload, SRSLTE_RAR_GRANT_LEN);
diff --git a/srsue/test/ttcn3/hdr/lte_ttcn3_phy.h b/srsue/test/ttcn3/hdr/lte_ttcn3_phy.h
index 75ef2efc3..a1c7130e3 100644
--- a/srsue/test/ttcn3/hdr/lte_ttcn3_phy.h
+++ b/srsue/test/ttcn3/hdr/lte_ttcn3_phy.h
@@ -64,7 +64,8 @@ public:
 
   // phy_interface_rrc_lte
   void enable_pregen_signals(bool enable) override;
-  void set_activation_deactivation_scell(uint32_t cmd) override;
+  void deactivate_scells() override;
+  void set_activation_deactivation_scell(uint32_t cmd, uint32_t tti) override;
   bool set_config(srslte::phy_cfg_t config, uint32_t cc_idx = 0) override;
   bool set_scell(srslte_cell_t cell_info, uint32_t cc_idx, uint32_t earfcn) override;
   void set_config_tdd(srslte_tdd_config_t& tdd_config) override;
diff --git a/srsue/test/ttcn3/src/lte_ttcn3_phy.cc b/srsue/test/ttcn3/src/lte_ttcn3_phy.cc
index 2d2635e72..7d4be9b47 100644
--- a/srsue/test/ttcn3/src/lte_ttcn3_phy.cc
+++ b/srsue/test/ttcn3/src/lte_ttcn3_phy.cc
@@ -75,7 +75,12 @@ void lte_ttcn3_phy::enable_pregen_signals(bool enable)
   log.debug("%s not implemented.\n", __FUNCTION__);
 }
 
-void lte_ttcn3_phy::set_activation_deactivation_scell(uint32_t cmd)
+void lte_ttcn3_phy::deactivate_scells()
+{
+  log.debug("%s not implemented.\n", __FUNCTION__);
+}
+
+void lte_ttcn3_phy::set_activation_deactivation_scell(uint32_t cmd, uint32_t tti)
 {
   log.debug("%s not implemented.\n", __FUNCTION__);
 }
diff --git a/srsue/test/upper/rrc_meas_test.cc b/srsue/test/upper/rrc_meas_test.cc
index 55ab6370c..0f7ba8c58 100644
--- a/srsue/test/upper/rrc_meas_test.cc
+++ b/srsue/test/upper/rrc_meas_test.cc
@@ -51,7 +51,7 @@ public:
   void set_config_mbsfn_mcch(const srslte::mcch_msg_t& mcch) override {}
   bool cell_search() override { return true; }
   bool cell_is_camping() override { return true; }
-  void set_activation_deactivation_scell(uint32_t cmd) override {}
+  void deactivate_scells() override {}
   bool cell_select(phy_cell_t cell) override
   {
     last_selected_cell = cell;