--- a/src/lte/helper/lte-helper.h	Mon Jul 02 18:25:11 2012 +0200
+++ b/src/lte/helper/lte-helper.h	Mon Jul 02 19:24:52 2012 +0200
@@ -225,6 +225,33 @@
    */
   void ActivateDedicatedEpsBearer (Ptr<NetDevice> ueDevice, EpsBearer bearer, Ptr<EpcTft> tft);
 
+
+  /**
+   * Create an X2 interface between all the eNBs in a given set
+   *
+   * \param enbNodes the set of eNB nodes
+   */
+  void AddX2Interface (NodeContainer enbNodes);
+
+  /**
+   * Create an X2 interface between two eNBs
+   *
+   * \param enbNode1 one eNB of the X2 interface
+   * \param enbNode2 the other eNB of the X2 interface
+   */
+  void AddX2Interface (Ptr<Node> enbNode1, Ptr<Node> enbNode2);
+
+  /**
+   * Trigger an X2-based handover of a UE between two eNBs
+   *
+   * \param hoTime when the Handover is initiated
+   * \param ueNode the UE that hands off
+   * \param enbNode1 source eNB, originally the UE is attached to this eNB
+   * \param enbNode2 target eNB, the UE is finally connected to this eNB
+   */
+  void HandoverRequest (Time hoTime, Ptr<Node> ueNode, Ptr<Node> sourceEnbNode, Ptr<Node> targetEnbNode);
+
+
   /** 
    * Activate a Data Radio Bearer for a simplified LTE-only simulation
    * without EPC.
@@ -333,6 +360,8 @@
   Ptr<NetDevice> InstallSingleEnbDevice (Ptr<Node> n);
   Ptr<NetDevice> InstallSingleUeDevice (Ptr<Node> n);
 
+  void DoHandoverRequest (Ptr<Node> ueNode, Ptr<Node> sourceEnbNode, Ptr<Node> targetEnbNode);
+
   Ptr<SpectrumChannel> m_downlinkChannel;
   Ptr<SpectrumChannel> m_uplinkChannel;