diff --git a/lib/include/srslte/interfaces/enb_interfaces.h b/lib/include/srslte/interfaces/enb_interfaces.h
index 81420ad93..3aebdc78d 100644
--- a/lib/include/srslte/interfaces/enb_interfaces.h
+++ b/lib/include/srslte/interfaces/enb_interfaces.h
@@ -53,7 +53,9 @@ public:
     dl_sched_grant_t pdsch[MAX_GRANTS];
     uint32_t         nof_grants;
     uint32_t         cfi;
-  } dl_sched_t;
+  } dl_sched_t; // per carrier
+
+  typedef std::vector<dl_sched_t> dl_sched_list_t;
 
   typedef struct {
     uint16_t rnti;
diff --git a/lib/include/srslte/interfaces/sched_interface.h b/lib/include/srslte/interfaces/sched_interface.h
index ee811ae36..b8d4a3b03 100644
--- a/lib/include/srslte/interfaces/sched_interface.h
+++ b/lib/include/srslte/interfaces/sched_interface.h
@@ -239,8 +239,8 @@ public:
   virtual int ul_cqi_info(uint32_t tti, uint16_t rnti, uint32_t cc_idx, uint32_t cqi, uint32_t ul_ch_code) = 0;
 
   /* Run Scheduler for this tti */
-  virtual int dl_sched(uint32_t tti, dl_sched_res_t* sched_result) = 0;
-  virtual int ul_sched(uint32_t tti, ul_sched_res_t* sched_result) = 0;
+  virtual int dl_sched(uint32_t tti, uint32_t cc_idx, dl_sched_res_t& sched_result) = 0;
+  virtual int ul_sched(uint32_t tti, uint32_t cc_idx, ul_sched_res_t& sched_result) = 0;
 
   /* Custom */
   virtual void set_dl_tti_mask(uint8_t* tti_mask, uint32_t nof_sfs) = 0;
diff --git a/srsenb/hdr/stack/mac/mac.h b/srsenb/hdr/stack/mac/mac.h
index 9bb41f867..ea7717c24 100644
--- a/srsenb/hdr/stack/mac/mac.h
+++ b/srsenb/hdr/stack/mac/mac.h
@@ -60,13 +60,13 @@ public:
 
   int ri_info(uint32_t tti, uint16_t rnti, uint32_t ri_value);
   int pmi_info(uint32_t tti, uint16_t rnti, uint32_t pmi_value);
-  int cqi_info(uint32_t tti, uint16_t rnti, uint32_t cqi_value); 
-  int snr_info(uint32_t tti, uint16_t rnti, float snr); 
+  int cqi_info(uint32_t tti, uint16_t rnti, uint32_t cqi_value);
+  int snr_info(uint32_t tti, uint16_t rnti, float snr);
   int ack_info(uint32_t tti, uint16_t rnti, uint32_t tb_idx, bool ack);
-  int crc_info(uint32_t tti, uint16_t rnti, uint32_t nof_bytes, bool crc_res); 
-    
-  int get_dl_sched(uint32_t tti, dl_sched_t *dl_sched_res);
-  int get_ul_sched(uint32_t tti, ul_sched_t *ul_sched_res);
+  int crc_info(uint32_t tti, uint16_t rnti, uint32_t nof_bytes, bool crc_res);
+
+  int  get_dl_sched(uint32_t tti, dl_sched_t* dl_sched_res);
+  int  get_ul_sched(uint32_t tti, ul_sched_t* ul_sched_res);
   int  get_mch_sched(uint32_t tti, bool is_mcch, dl_sched_t* dl_sched_res);
   void set_sched_dl_tti_mask(uint8_t* tti_mask, uint32_t nof_sfs) final
   {
@@ -99,31 +99,31 @@ public:
   void     get_metrics(mac_metrics_t metrics[ENB_METRICS_MAX_USERS]);
   void     write_mcch(asn1::rrc::sib_type2_s* sib2, asn1::rrc::sib_type13_r9_s* sib13, asn1::rrc::mcch_msg_s* mcch);
 
-private:  
+private:
+  static const int      MAX_LOCATIONS            = 20;
+  static const uint32_t cfi                      = 3;
+  srslte_dci_location_t locations[MAX_LOCATIONS] = {};
 
-  static const int MAX_LOCATIONS = 20;
-  static const uint32_t cfi = 3; 
-  srslte_dci_location_t locations[MAX_LOCATIONS];
-  
-  static const int MAC_PDU_THREAD_PRIO  = 60;
+  static const int MAC_PDU_THREAD_PRIO = 60;
 
-  // We use a rwlock in MAC to allow multiple workers to access MAC simultaneously. No conflicts will happen since access for different TTIs
-  pthread_rwlock_t rwlock;
+  // We use a rwlock in MAC to allow multiple workers to access MAC simultaneously. No conflicts will happen since
+  // access for different TTIs
+  pthread_rwlock_t rwlock = {};
 
   // Interaction with PHY
-  phy_interface_stack_lte* phy_h;
-  rlc_interface_mac*       rlc_h;
-  rrc_interface_mac*       rrc_h;
-  stack_interface_mac_lte* stack;
-  srslte::log*             log_h;
+  phy_interface_stack_lte* phy_h = nullptr;
+  rlc_interface_mac*       rlc_h = nullptr;
+  rrc_interface_mac*       rrc_h = nullptr;
+  stack_interface_mac_lte* stack = nullptr;
+  srslte::log*             log_h = nullptr;
 
   srslte_cell_t cell;
-  mac_args_t    args; 
-  
-  bool          started;
+  mac_args_t    args = {};
+
+  bool started = false;
 
   /* Scheduler unit */
-  sched            scheduler; 
+  sched                       scheduler;
   dl_metric_rr     sched_metric_dl_rr;
   ul_metric_rr     sched_metric_ul_rr;
   sched_interface::cell_cfg_t cell_config;
@@ -163,7 +163,7 @@ private:
   uint8_t          mtch_payload_buffer[mtch_payload_len];
 
   // pointer to MAC PCAP object
-  srslte::mac_pcap* pcap;
+  srslte::mac_pcap* pcap = nullptr;
 };
 
 } // namespace srsenb
diff --git a/srsenb/hdr/stack/mac/scheduler.h b/srsenb/hdr/stack/mac/scheduler.h
index 643bc158a..d9fd62c98 100644
--- a/srsenb/hdr/stack/mac/scheduler.h
+++ b/srsenb/hdr/stack/mac/scheduler.h
@@ -145,8 +145,8 @@ public:
   int ul_phr(uint16_t rnti, int phr) final;
   int ul_cqi_info(uint32_t tti, uint16_t rnti, uint32_t cc_idx, uint32_t cqi, uint32_t ul_ch_code) final;
 
-  int dl_sched(uint32_t tti, dl_sched_res_t* sched_result) final;
-  int ul_sched(uint32_t tti, ul_sched_res_t* sched_result) final;
+  int dl_sched(uint32_t tti, uint32_t cc_idx, dl_sched_res_t& sched_result) final;
+  int ul_sched(uint32_t tti, uint32_t cc_idx, ul_sched_res_t& sched_result) final;
 
   /* Custom functions
    */
diff --git a/srsenb/src/stack/mac/mac.cc b/srsenb/src/stack/mac/mac.cc
index 9091ad190..ec58e0acc 100644
--- a/srsenb/src/stack/mac/mac.cc
+++ b/srsenb/src/stack/mac/mac.cc
@@ -40,22 +40,13 @@ namespace srsenb {
 
 mac::mac() : last_rnti(0), rar_pdu_msg(sched_interface::MAX_RAR_LIST), rar_payload()
 {
-  started = false;
-  pcap    = NULL;
-  phy_h = NULL;
-  rlc_h = NULL;
-  rrc_h = NULL;
-  log_h = NULL;
-
-  bzero(&locations, sizeof(locations));
   bzero(&cell, sizeof(cell));
-  bzero(&args, sizeof(args));
   bzero(&bcch_dlsch_payload, sizeof(bcch_dlsch_payload));
   bzero(&pcch_payload_buffer, sizeof(pcch_payload_buffer));
   bzero(&bcch_softbuffer_tx, sizeof(bcch_softbuffer_tx));
   bzero(&pcch_softbuffer_tx, sizeof(pcch_softbuffer_tx));
   bzero(&rar_softbuffer_tx, sizeof(rar_softbuffer_tx));
-  pthread_rwlock_init(&rwlock, NULL);
+  pthread_rwlock_init(&rwlock, nullptr);
 }
 
 mac::~mac()
@@ -540,9 +531,8 @@ int mac::get_dl_sched(uint32_t tti, dl_sched_t *dl_sched_res)
   }
 
   // Run scheduler with current info
-  sched_interface::dl_sched_res_t sched_result;
-  bzero(&sched_result, sizeof(sched_interface::dl_sched_res_t));
-  if (scheduler.dl_sched(tti, &sched_result) < 0) {
+  sched_interface::dl_sched_res_t sched_result = {};
+  if (scheduler.dl_sched(tti, 0, sched_result) < 0) {
     Error("Running scheduler\n");
     return SRSLTE_ERROR;
   }
@@ -790,9 +780,8 @@ int mac::get_ul_sched(uint32_t tti, ul_sched_t *ul_sched_res)
   }
 
   // Run scheduler with current info
-  sched_interface::ul_sched_res_t sched_result;
-  bzero(&sched_result, sizeof(sched_interface::ul_sched_res_t));
-  if (scheduler.ul_sched(tti, &sched_result)<0) {
+  sched_interface::ul_sched_res_t sched_result = {};
+  if (scheduler.ul_sched(tti, 0, sched_result) < 0) {
     Error("Running scheduler\n");
     return SRSLTE_ERROR;
   }
diff --git a/srsenb/src/stack/mac/scheduler.cc b/srsenb/src/stack/mac/scheduler.cc
index e8051173d..04b022712 100644
--- a/srsenb/src/stack/mac/scheduler.cc
+++ b/srsenb/src/stack/mac/scheduler.cc
@@ -384,7 +384,7 @@ void sched::tpc_dec(uint16_t rnti)
  *******************************************************/
 
 // Downlink Scheduler API
-int sched::dl_sched(uint32_t tti, sched_interface::dl_sched_res_t* sched_result)
+int sched::dl_sched(uint32_t tti, uint32_t cc_idx, sched_interface::dl_sched_res_t& sched_result)
 {
   if (!configured) {
     return 0;
@@ -393,19 +393,21 @@ int sched::dl_sched(uint32_t tti, sched_interface::dl_sched_res_t* sched_result)
   uint32_t tti_rx = sched_utils::tti_subtract(tti, TX_DELAY);
   current_tti     = sched_utils::max_tti(current_tti, tti_rx);
 
-  // Compute scheduling Result for tti_rx
-  pthread_rwlock_rdlock(&rwlock);
-  tti_sched_result_t* tti_sched = carrier_schedulers[0]->generate_tti_result(tti_rx);
-  pthread_rwlock_unlock(&rwlock);
+  if (cc_idx < carrier_schedulers.size()) {
+    // Compute scheduling Result for tti_rx
+    pthread_rwlock_rdlock(&rwlock);
+    tti_sched_result_t* tti_sched = carrier_schedulers[cc_idx]->generate_tti_result(tti_rx);
+    pthread_rwlock_unlock(&rwlock);
 
-  // Copy result
-  *sched_result = tti_sched->dl_sched_result;
+    // copy result
+    sched_result = tti_sched->dl_sched_result;
+  }
 
   return 0;
 }
 
 // Uplink Scheduler API
-int sched::ul_sched(uint32_t tti, srsenb::sched_interface::ul_sched_res_t* sched_result)
+int sched::ul_sched(uint32_t tti, uint32_t cc_idx, srsenb::sched_interface::ul_sched_res_t& sched_result)
 {
   if (!configured) {
     return 0;
@@ -413,12 +415,15 @@ int sched::ul_sched(uint32_t tti, srsenb::sched_interface::ul_sched_res_t* sched
 
   // Compute scheduling Result for tti_rx
   uint32_t tti_rx = sched_utils::tti_subtract(tti, 2 * FDD_HARQ_DELAY_MS);
-  pthread_rwlock_rdlock(&rwlock);
-  tti_sched_result_t* tti_sched = carrier_schedulers[0]->generate_tti_result(tti_rx);
-  pthread_rwlock_unlock(&rwlock);
 
-  // Copy result
-  *sched_result = tti_sched->ul_sched_result;
+  if (cc_idx < carrier_schedulers.size()) {
+    pthread_rwlock_rdlock(&rwlock);
+    tti_sched_result_t* tti_sched = carrier_schedulers[cc_idx]->generate_tti_result(tti_rx);
+    pthread_rwlock_unlock(&rwlock);
+
+    // copy result
+    sched_result = tti_sched->ul_sched_result;
+  }
 
   return SRSLTE_SUCCESS;
 }
diff --git a/srsenb/test/mac/scheduler_test.cc b/srsenb/test/mac/scheduler_test.cc
index c6c144a34..bdfa189b6 100644
--- a/srsenb/test/mac/scheduler_test.cc
+++ b/srsenb/test/mac/scheduler_test.cc
@@ -139,10 +139,10 @@ int main(int argc, char *argv[])
   while(running) {
     log_out.step(tti);
     if (tti > 50) {
-      running = false; 
+      running = false;
     }
-    my_sched.dl_sched(tti, &sched_result_dl);
-    my_sched.ul_sched(tti, &sched_result_ul);
+    my_sched.dl_sched(tti, 0, sched_result_dl);
+    my_sched.ul_sched(tti, 0, sched_result_ul);
     tti = (tti + 1) % 10240;
     if (tti >= 4) {
       my_sched.ul_crc_info(tti, rnti, 0, tti % 2);
diff --git a/srsenb/test/mac/scheduler_test_rand.cc b/srsenb/test/mac/scheduler_test_rand.cc
index 0a90330a4..4d58f54c7 100644
--- a/srsenb/test/mac/scheduler_test_rand.cc
+++ b/srsenb/test/mac/scheduler_test_rand.cc
@@ -410,8 +410,8 @@ void sched_tester::run_tti(uint32_t tti_rx)
   ack_txs();
   before_sched();
 
-  dl_sched(tti_data.tti_tx_dl, &tti_data.sched_result_dl);
-  ul_sched(tti_data.tti_tx_ul, &tti_data.sched_result_ul);
+  dl_sched(tti_data.tti_tx_dl, CARRIER_IDX, tti_data.sched_result_dl);
+  ul_sched(tti_data.tti_tx_ul, CARRIER_IDX, tti_data.sched_result_ul);
 
   process_results();
 }