diff --git a/src/lte/model/lte-common.h b/src/lte/model/lte-common.h
index a74b482f6..497ccedd9 100644
--- a/src/lte/model/lte-common.h
+++ b/src/lte/model/lte-common.h
@@ -127,6 +127,7 @@ struct PhyTransmissionStatParameters
   uint16_t m_size;    ///< Size of transport block
   uint8_t  m_rv;      ///< the redundancy version (HARQ)
   uint8_t  m_ndi;     ///< new data indicator flag
+  uint8_t  m_ccId;    ///< component carrier id
   
   /**
    *  TracedCallback signature.
@@ -152,6 +153,7 @@ struct PhyReceptionStatParameters
   uint8_t  m_rv;           ///< the redundancy version (HARQ)
   uint8_t  m_ndi;          ///< new data indicator flag
   uint8_t  m_correctness;  ///< correctness of the TB received
+  uint8_t  m_ccId;        ///< component carrier id
 
   /**
    *  TracedCallback signature.
diff --git a/src/lte/model/lte-enb-mac.cc b/src/lte/model/lte-enb-mac.cc
index a50ec1165..0218d7bab 100644
--- a/src/lte/model/lte-enb-mac.cc
+++ b/src/lte/model/lte-enb-mac.cc
@@ -339,6 +339,11 @@ LteEnbMac::GetTypeId (void)
                      "Information regarding UL scheduling.",
                      MakeTraceSourceAccessor (&LteEnbMac::m_ulScheduling),
                      "ns3::LteEnbMac::UlSchedulingTracedCallback")
+    .AddAttribute ("ComponentCarrierId",
+                   "ComponentCarrier Id, needed to reply on the appropriate sap.",
+                   UintegerValue (0),
+                   MakeUintegerAccessor (&LteEnbMac::m_componentCarrierId),
+                   MakeUintegerChecker<uint8_t> (0,4))
   ;
 
   return tid;
@@ -378,6 +383,11 @@ LteEnbMac::DoDispose ()
   delete m_enbPhySapUser;
 }
 
+void
+LteEnbMac::SetComponentCarrierId (uint16_t index)
+{
+  m_componentCarrierId = index;
+}
 
 void
 LteEnbMac::SetFfMacSchedSapProvider (FfMacSchedSapProvider* s)
diff --git a/src/lte/model/lte-enb-mac.h b/src/lte/model/lte-enb-mac.h
index 09e154d34..32861f8e3 100644
--- a/src/lte/model/lte-enb-mac.h
+++ b/src/lte/model/lte-enb-mac.h
@@ -62,7 +62,7 @@ public:
   virtual ~LteEnbMac (void);
   virtual void DoDispose (void);
 
-
+  void SetComponentCarrierId (uint16_t index);
   /**
    * \brief Set the scheduler SAP provider
    * \param s a pointer SAP provider of the FF packet scheduler
@@ -290,6 +290,10 @@ private:
   std::map<uint8_t, uint32_t> m_receivedRachPreambleCount;
 
   std::map<uint8_t, uint32_t> m_rapIdRntiMap;
+
+  // component carrier Id used to address sap
+  uint8_t m_componentCarrierId;
+ 
 };
 
 } // end namespace ns3
diff --git a/src/lte/model/lte-enb-phy.cc b/src/lte/model/lte-enb-phy.cc
index 6df91436c..f30358a70 100644
--- a/src/lte/model/lte-enb-phy.cc
+++ b/src/lte/model/lte-enb-phy.cc
@@ -704,6 +704,7 @@ LteEnbPhy::StartSubFrame (void)
                   params.m_size = dci->GetDci ().m_tbsSize.at (i);
                   params.m_rv = dci->GetDci ().m_rv.at (i);
                   params.m_ndi = dci->GetDci ().m_ndi.at (i);
+                  params.m_ccId = m_componentCarrierId;
                   m_dlPhyTransmission (params);
                 }
 
diff --git a/src/lte/model/lte-mac-sap.h b/src/lte/model/lte-mac-sap.h
index e06791f98..f8476dbea 100644
--- a/src/lte/model/lte-mac-sap.h
+++ b/src/lte/model/lte-mac-sap.h
@@ -49,6 +49,7 @@ public:
     uint8_t     lcid; /**< the logical channel id corresponding to the sending RLC instance */
     uint8_t     layer; /**< the layer value that was passed by the MAC in the call to NotifyTxOpportunity that generated this PDU */
     uint8_t     harqProcessId; /**< the HARQ process id that was passed by the MAC in the call to NotifyTxOpportunity that generated this PDU */
+    uint8_t componentCarrierId; /**< the component carrier id corresponding to the sending Mac istance */
   };
 
   /**
diff --git a/src/lte/model/lte-phy.cc b/src/lte/model/lte-phy.cc
index a7a54e899..e2ddfc73b 100644
--- a/src/lte/model/lte-phy.cc
+++ b/src/lte/model/lte-phy.cc
@@ -49,7 +49,8 @@ LtePhy::LtePhy (Ptr<LteSpectrumPhy> dlPhy, Ptr<LteSpectrumPhy> ulPhy)
     m_dlBandwidth (0),
     m_rbgSize (0),
     m_macChTtiDelay (0),
-    m_cellId (0)
+    m_cellId (0),
+    m_componentCarrierId(0)
 {
   NS_LOG_FUNCTION (this);
 }
@@ -249,5 +250,18 @@ LtePhy::DoSetCellId (uint16_t cellId)
   m_uplinkSpectrumPhy->SetCellId (cellId);
 }
 
+void
+LtePhy::SetComponentCarrierId (uint16_t index)
+{
+  m_componentCarrierId = index;
+  m_downlinkSpectrumPhy->SetComponentCarrierId (index);
+  m_uplinkSpectrumPhy->SetComponentCarrierId (index);
+}
+
+uint8_t
+LtePhy::GetComponentCarrierId ()
+{
+  return m_componentCarrierId;
+}
 
 } // namespace ns3
diff --git a/src/lte/model/lte-phy.h b/src/lte/model/lte-phy.h
index f9b8d9739..a0cfdc1e8 100644
--- a/src/lte/model/lte-phy.h
+++ b/src/lte/model/lte-phy.h
@@ -209,7 +209,9 @@ public:
   */
   virtual void ReportRsReceivedPower (const SpectrumValue& power) = 0;
 
+  void SetComponentCarrierId (uint16_t index);
 
+  uint8_t GetComponentCarrierId ();
 
 protected:
   /// Pointer to the NetDevice where this PHY layer is attached.
@@ -291,6 +293,9 @@ protected:
    */
   uint16_t m_cellId;
 
+  /// component carrier Id used to address sap
+  uint8_t m_componentCarrierId;
+
 }; // end of `class LtePhy`
 
 
diff --git a/src/lte/model/lte-spectrum-phy.cc b/src/lte/model/lte-spectrum-phy.cc
index 9500f63dd..bf66d3adc 100644
--- a/src/lte/model/lte-spectrum-phy.cc
+++ b/src/lte/model/lte-spectrum-phy.cc
@@ -984,6 +984,7 @@ LteSpectrumPhy::EndRxData ()
           params.m_rv = (*itTb).second.rv;
           params.m_ndi = (*itTb).second.ndi;
           params.m_correctness = (uint8_t)!(*itTb).second.corrupt;
+          params.m_ccId = m_componentCarrierId;
           if ((*itTb).second.downlink)
             {
               // DL
@@ -1189,6 +1190,11 @@ LteSpectrumPhy::SetCellId (uint16_t cellId)
   m_cellId = cellId;
 }
 
+void
+LteSpectrumPhy::SetComponentCarrierId (uint8_t componentCarrierId)
+{
+  m_componentCarrierId = componentCarrierId;
+}
 
 void
 LteSpectrumPhy::AddRsPowerChunkProcessor (Ptr<LteChunkProcessor> p)
diff --git a/src/lte/model/lte-spectrum-phy.h b/src/lte/model/lte-spectrum-phy.h
index f8d14974d..892b2577d 100644
--- a/src/lte/model/lte-spectrum-phy.h
+++ b/src/lte/model/lte-spectrum-phy.h
@@ -323,6 +323,11 @@ public:
    */
   void SetCellId (uint16_t cellId);
 
+  /**
+   *
+   * \param componentCarrierId the component carrier id
+   */
+  void SetComponentCarrierId (uint8_t componentCarrierId);
 
   /**
   *
@@ -468,6 +473,7 @@ private:
 
   uint16_t m_cellId;
   
+  uint8_t m_componentCarrierId;
   expectedTbs_t m_expectedTbs;
   SpectrumValue m_sinrPerceived;
 
diff --git a/src/lte/model/lte-ue-cphy-sap.h b/src/lte/model/lte-ue-cphy-sap.h
index 8f876d4c8..4d93a8f9b 100644
--- a/src/lte/model/lte-ue-cphy-sap.h
+++ b/src/lte/model/lte-ue-cphy-sap.h
@@ -177,6 +177,7 @@ public:
   struct UeMeasurementsParameters
   {
     std::vector <struct UeMeasurementsElement> m_ueMeasurementsList;
+    uint16_t m_componentCarrierId;
   };
 
 
diff --git a/src/lte/model/lte-ue-mac.cc b/src/lte/model/lte-ue-mac.cc
index 78c57a2d7..982168fb1 100644
--- a/src/lte/model/lte-ue-mac.cc
+++ b/src/lte/model/lte-ue-mac.cc
@@ -224,6 +224,7 @@ LteUeMac::LteUeMac ()
   m_cmacSapProvider = new UeMemberLteUeCmacSapProvider (this);
   m_uePhySapUser = new UeMemberLteUePhySapUser (this);
   m_raPreambleUniformVariable = CreateObject<UniformRandomVariable> ();
+  m_componentCarrierId = 0;
 }
 
 
@@ -275,6 +276,11 @@ LteUeMac::GetLteUeCmacSapProvider (void)
   return m_cmacSapProvider;
 }
 
+void
+LteUeMac::SetComponentCarrierId (uint16_t index)
+{
+  m_componentCarrierId = index;
+}
 
 void
 LteUeMac::DoTransmitPdu (LteMacSapProvider::TransmitPduParameters params)
diff --git a/src/lte/model/lte-ue-mac.h b/src/lte/model/lte-ue-mac.h
index 2541d6e8c..107aad9fe 100644
--- a/src/lte/model/lte-ue-mac.h
+++ b/src/lte/model/lte-ue-mac.h
@@ -56,6 +56,8 @@ public:
   LteMacSapProvider*  GetLteMacSapProvider (void);
   void  SetLteUeCmacSapUser (LteUeCmacSapUser* s);
   LteUeCmacSapProvider*  GetLteUeCmacSapProvider (void);
+  
+  void SetComponentCarrierId (uint16_t index);
 
   /**
   * \brief Get the PHY SAP user
@@ -113,6 +115,9 @@ private:
   void SendReportBufferStatus (void);
   void RefreshHarqProcessesPacketBuffer (void);
 
+  /// component carrier Id --> used to address sap
+  uint8_t m_componentCarrierId;
+
 private:
 
   struct LcInfo