x2ap: timers, cleanup

This commit introduces X2AP timers (t_reloc_prep, tx2_reloc_overall).
You need to set the values in the configuration file.

X2AP can be enabled or disabled in the configuration file too (disabled
by default).

Some deadcode was removed.

ci-scripts/conf_files/enb.band13.tm1.50PRB.emtc.conf

@@ -360,6 +360,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/enb.band40.tm1.100PRB.FairScheduler.usrpb210.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/enb.band40.tm1.25PRB.FairScheduler.usrpb210.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/enb.band40.tm1.50PRB.FairScheduler.usrpb210.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/enb.band7.tm1.100PRB.usrpb210.conf

@@ -178,6 +178,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/enb.band7.tm1.25PRB.usrpb210.conf

@@ -178,6 +178,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/enb.band7.tm1.50PRB.usrpb210.conf

@@ -178,6 +178,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/enb.band7.tm2.25PRB.usrpb210.conf

@@ -181,6 +181,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/lte-fdd-basic-sim.conf

@@ -178,6 +178,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
 

ci-scripts/conf_files/lte-tdd-basic-sim.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/rcc.band40.tm1.100PRB.FairScheduler.usrpb210.conf

@@ -144,6 +144,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/rcc.band40.tm1.25PRB.FairScheduler.usrpb210.conf

@@ -144,6 +144,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/rcc.band40.tm1.50PRB.FairScheduler.usrpb210.conf

@@ -144,6 +144,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/rcc.band7.tm1.if4p5.lo.100PRB.usrpb210.conf

@@ -181,6 +181,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/rcc.band7.tm1.if4p5.lo.25PRB.usrpb210.conf

@@ -181,6 +181,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/rcc.band7.tm1.if4p5.lo.50PRB.usrpb210.conf

@@ -181,6 +181,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

ci-scripts/conf_files/rcc.band7.tm1.nfapi.conf

@@ -179,6 +179,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "ens3";

cmake_targets/CMakeLists.txt

@@ -471,6 +471,7 @@ add_library(X2AP_ENB
   ${X2AP_DIR}/x2ap_eNB_management_procedures.c
   ${X2AP_DIR}/x2ap_eNB_generate_messages.c
   ${X2AP_DIR}/x2ap_ids.c
+  ${X2AP_DIR}/x2ap_timers.c
  )
 add_dependencies(X2AP_ENB rrc_flag x2_flag)
 

cmake_targets/autotests/v2/config/enb.band38.tm1.usrpb210.tdd.10MHz.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth6";

cmake_targets/autotests/v2/config/enb.band38.tm1.usrpb210.tdd.20MHz.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth6";

cmake_targets/autotests/v2/config/enb.band38.tm1.usrpb210.tdd.5MHz.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth6";

cmake_targets/autotests/v2/config/enb.band7.tm1.usrpb210.fdd.10MHz.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

cmake_targets/autotests/v2/config/enb.band7.tm1.usrpb210.fdd.20MHz.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

cmake_targets/autotests/v2/config/enb.band7.tm1.usrpb210.fdd.5MHz.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

cmake_targets/autotests/v2/config/rcc.band7.tm1.if4p5.10MHz.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

cmake_targets/autotests/v2/config/rcc.band7.tm1.if4p5.20MHz.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

cmake_targets/autotests/v2/config/rcc.band7.tm1.if4p5.5MHz.conf

@@ -141,6 +141,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

cmake_targets/autotests/v2/config/rru.band7.tm1.if4p5.10MHz.udp.usrpb210.conf

@@ -143,6 +143,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth3";

cmake_targets/autotests/v2/config/rru.band7.tm1.if4p5.20MHz.udp.usrpb210.conf

@@ -143,6 +143,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth3";

cmake_targets/autotests/v2/config/rru.band7.tm1.if4p5.5MHz.udp.usrpb210.conf

@@ -143,6 +143,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth3";

configuration/bladeRF/enb-band7-5mhz.conf

@@ -181,6 +181,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES : 
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth1";

openair2/COMMON/x2ap_messages_def.h

@@ -32,6 +32,7 @@ MESSAGE_DEF(X2AP_SETUP_REQUEST_LOG              , MESSAGE_PRIORITY_MED, IttiMsgT
 
 /* eNB application layer -> X2AP messages */
 MESSAGE_DEF(X2AP_REGISTER_ENB_REQ               , MESSAGE_PRIORITY_MED, x2ap_register_enb_req_t          , x2ap_register_enb_req)
+MESSAGE_DEF(X2AP_SUBFRAME_PROCESS               , MESSAGE_PRIORITY_MED, x2ap_subframe_process_t          , x2ap_subframe_process)
 
 /* X2AP -> eNB application layer messages */
 MESSAGE_DEF(X2AP_REGISTER_ENB_CNF               , MESSAGE_PRIORITY_MED, x2ap_register_enb_cnf_t          , x2ap_register_enb_cnf)
@@ -40,6 +41,7 @@ MESSAGE_DEF(X2AP_DEREGISTERED_ENB_IND           , MESSAGE_PRIORITY_MED, x2ap_der
 /* handover messages X2AP <-> RRC */
 MESSAGE_DEF(X2AP_HANDOVER_REQ                   , MESSAGE_PRIORITY_MED, x2ap_handover_req_t              , x2ap_handover_req)
 MESSAGE_DEF(X2AP_HANDOVER_REQ_ACK               , MESSAGE_PRIORITY_MED, x2ap_handover_req_ack_t          , x2ap_handover_req_ack)
+MESSAGE_DEF(X2AP_HANDOVER_CANCEL                , MESSAGE_PRIORITY_MED, x2ap_handover_cancel_t           , x2ap_handover_cancel)
 
 /* handover messages X2AP <-> S1AP */
 MESSAGE_DEF(X2AP_UE_CONTEXT_RELEASE             , MESSAGE_PRIORITY_MED, x2ap_ue_context_release_t        , x2ap_ue_context_release)

openair2/COMMON/x2ap_messages_types.h

@@ -34,6 +34,7 @@
 #define X2AP_REGISTER_ENB_CNF(mSGpTR)           (mSGpTR)->ittiMsg.x2ap_register_enb_cnf
 #define X2AP_DEREGISTERED_ENB_IND(mSGpTR)       (mSGpTR)->ittiMsg.x2ap_deregistered_enb_ind
 #define X2AP_UE_CONTEXT_RELEASE(mSGpTR)         (mSGpTR)->ittiMsg.x2ap_ue_context_release
+#define X2AP_HANDOVER_CANCEL(mSGpTR)            (mSGpTR)->ittiMsg.x2ap_handover_cancel
 
 
 #define X2AP_MAX_NB_ENB_IP_ADDRESS 2
@@ -48,6 +49,16 @@ typedef struct x2ap_ue_context_release_s {
   int source_assoc_id;
 } x2ap_ue_context_release_t;
 
+typedef enum {
+  X2AP_T_RELOC_PREP_TIMEOUT,
+  X2AP_TX2_RELOC_OVERALL_TIMEOUT
+} x2ap_handover_cancel_cause_t;
+
+typedef struct x2ap_handover_cancel_s {
+  int rnti;
+  x2ap_handover_cancel_cause_t cause;
+} x2ap_handover_cancel_t;
+
 typedef struct x2ap_register_enb_req_s {
   /* Unique eNB_id to identify the eNB within EPC.
    * For macro eNB ids this field should be 20 bits long.
@@ -105,8 +116,16 @@ typedef struct x2ap_register_enb_req_s {
 
   /* eNB port for X2C*/
   uint32_t enb_port_for_X2C;
+
+  /* timers (unit: millisecond) */
+  int t_reloc_prep;
+  int tx2_reloc_overall;
 } x2ap_register_enb_req_t;
 
+typedef struct x2ap_subframe_process_s {
+  /* nothing, we simply use the module ID in the header */
+} x2ap_subframe_process_t;
+
 //-------------------------------------------------------------------------------------------//
 // X2AP -> eNB application layer messages
 typedef struct x2ap_register_enb_cnf_s {

openair2/ENB_APP/enb_app.c

@@ -151,8 +151,8 @@ void *eNB_app_task(void *args_p) {
   uint32_t                        register_enb_pending=0;
   uint32_t                        registered_enb;
   long                            enb_register_retry_timer_id;
-  uint32_t                        x2_register_enb_pending;
-  uint32_t                        x2_registered_enb;
+  uint32_t                        x2_register_enb_pending = 0;
+  uint32_t                        x2_registered_enb = 0;
   long                            x2_enb_register_retry_timer_id;
   uint32_t                        enb_id;
   MessageDef                     *msg_p           = NULL;
@@ -188,9 +188,11 @@ void *eNB_app_task(void *args_p) {
     register_enb_pending = eNB_app_register (enb_id_start, enb_id_end);//, enb_properties_p);
   }
 
+  if (is_x2ap_enabled()) {
     /* Try to register each eNB with each other */
     x2_registered_enb = 0;
     x2_register_enb_pending = eNB_app_register_x2 (enb_id_start, enb_id_end);
+  }
 
   do {
     // Wait for a message

openair2/ENB_APP/enb_config.c

@@ -2053,6 +2053,28 @@ int RCconfig_X2(MessageDef *msg_p, uint32_t i) {
 	      }
 	    }
 	    
+            // timers
+            {
+              int t_reloc_prep = 0;
+              int tx2_reloc_overall = 0;
+
+              paramdef_t p[] = {
+                { "t_reloc_prep", "t_reloc_prep", 0, iptr:&t_reloc_prep, defintval:0, TYPE_INT, 0 },
+                { "tx2_reloc_overall", "tx2_reloc_overall", 0, iptr:&tx2_reloc_overall, defintval:0, TYPE_INT, 0 }
+              };
+
+              config_get(p, sizeof(p)/sizeof(paramdef_t), aprefix);
+
+              if (t_reloc_prep <= 0 || t_reloc_prep > 10000 ||
+                  tx2_reloc_overall <= 0 || tx2_reloc_overall > 20000) {
+                LOG_E(X2AP, "timers in configuration file have wrong values. We must have [0 < t_reloc_prep <= 10000] and [0 < tx2_reloc_overall <= 20000]\n");
+                exit(1);
+              }
+
+	      X2AP_REGISTER_ENB_REQ (msg_p).t_reloc_prep = t_reloc_prep;
+	      X2AP_REGISTER_ENB_REQ (msg_p).tx2_reloc_overall = tx2_reloc_overall;
+            }
+
 	    // SCTP SETTING
 	    X2AP_REGISTER_ENB_REQ (msg_p).sctp_out_streams = SCTP_OUT_STREAMS;
 	    X2AP_REGISTER_ENB_REQ (msg_p).sctp_in_streams  = SCTP_IN_STREAMS;

openair2/RRC/LTE/rrc_defs.h

@@ -344,7 +344,8 @@ typedef enum HO_STATE_e {
   HO_REQUEST,
   HO_ACK,
   HO_CONFIGURED,
-  HO_RELEASE
+  HO_RELEASE,
+  HO_CANCEL
 } HO_STATE_t;
 
 typedef enum SL_TRIGGER_e {

openair2/RRC/LTE/rrc_eNB.c

@@ -63,6 +63,7 @@
 #include "LTE_PeriodicBSR-Timer-r12.h"
 #include "LTE_RetxBSR-Timer-r12.h"
 #include "common/utils/LOG/vcd_signal_dumper.h"
+#include "x2ap_eNB.h"
 
 #include "T.h"
 
@@ -850,9 +851,7 @@ rrc_eNB_free_UE(
       LOG_I(RRC, "[eNB %d] S1AP_UE_CONTEXT_RELEASE_REQ sent for RNTI %x, cause 21, radio connection with ue lost\n",
             enb_mod_idP,
             rnti);
-#if defined(ENABLE_USE_MME)
       rrc_eNB_send_S1AP_UE_CONTEXT_RELEASE_REQ(enb_mod_idP, ue_context_pP, S1AP_CAUSE_RADIO_NETWORK, 21);
-#endif
       // send cause 21: radio connection with ue lost
       /* From 3GPP 36300v10 p129 : 19.2.2.2.2 S1 UE Context Release Request (eNB triggered)
         * If the E-UTRAN internal reason is a radio link failure detected in the eNB, the eNB shall wait a sufficient time before
@@ -868,9 +867,7 @@ rrc_eNB_free_UE(
       LOG_I(RRC, "[eNB %d] S1AP_UE_CONTEXT_RELEASE_REQ sent for RNTI %x, cause 20, user inactivity\n",
             enb_mod_idP,
             rnti);
-#if defined(ENABLE_USE_MME)
       rrc_eNB_send_S1AP_UE_CONTEXT_RELEASE_REQ(enb_mod_idP, ue_context_pP, S1AP_CAUSE_RADIO_NETWORK, 20);
-#endif
       // send cause 20: user inactivity
       return;
     }
@@ -1043,9 +1040,7 @@ rrc_eNB_process_RRCConnectionSetupComplete(
 
   if (EPC_MODE_ENABLED == 1) {
     // Forward message to S1AP layer
-#if defined(ENABLE_USE_MME)
     rrc_eNB_send_S1AP_NAS_FIRST_REQ(ctxt_pP, ue_context_pP, rrcConnectionSetupComplete);
-#endif
   } else {
     // RRC loop back (no S1AP), send SecurityModeCommand to UE
     rrc_eNB_generate_SecurityModeCommand(ctxt_pP, ue_context_pP);
@@ -1342,6 +1337,7 @@ rrc_eNB_process_RRCConnectionReestablishmentComplete(
   /* for no gcc warnings */
   (void)dedicatedInfoNas;
   LTE_C_RNTI_t                           *cba_RNTI                         = NULL;
+  int                                    x2_enabled;
   uint8_t next_xid = rrc_eNB_get_next_transaction_identifier(ctxt_pP->module_id);
   ue_context_pP->ue_context.Status = RRC_CONNECTED;
   ue_context_pP->ue_context.ue_rrc_inactivity_timer = 1; // set rrc inactivity when UE goes into RRC_CONNECTED
@@ -1752,6 +1748,8 @@ rrc_eNB_process_RRCConnectionReestablishmentComplete(
     dedicatedInfoNASList = NULL;
   }
 
+  x2_enabled = is_x2ap_enabled();
+
   // send LTE_RRCConnectionReconfiguration
   memset(buffer, 0, RRC_BUF_SIZE);
   size = do_RRCConnectionReconfiguration(ctxt_pP,
@@ -1762,14 +1760,14 @@ rrc_eNB_process_RRCConnectionReestablishmentComplete(
                                          (LTE_DRB_ToReleaseList_t *)NULL, // DRB2_list,
                                          (struct LTE_SPS_Config *)NULL,   // maybe ue_context_pP->ue_context.sps_Config,
                                          (struct LTE_PhysicalConfigDedicated *)ue_context_pP->ue_context.physicalConfigDedicated,
-#ifdef EXMIMO_IOT
-                                         NULL, NULL, NULL,NULL,
-#else
-                                         (LTE_MeasObjectToAddModList_t *)MeasObj_list, // MeasObj_list,
-                                         (LTE_ReportConfigToAddModList_t *)ReportConfig_list, // ReportConfig_list,
-                                         (LTE_QuantityConfig_t *)quantityConfig, //quantityConfig,
+//#ifdef EXMIMO_IOT
+//                                         NULL, NULL, NULL,NULL,
+//#else
+                                         x2_enabled ? (LTE_MeasObjectToAddModList_t *)MeasObj_list : NULL, // MeasObj_list,
+                                         x2_enabled ? (LTE_ReportConfigToAddModList_t *)ReportConfig_list : NULL, // ReportConfig_list,
+                                         x2_enabled ? (LTE_QuantityConfig_t *)quantityConfig : NULL, //quantityConfig,
                                          (LTE_MeasIdToAddModList_t *)NULL,
-#endif
+//#endif
                                          (LTE_MAC_MainConfig_t *)ue_context_pP->ue_context.mac_MainConfig,
                                          (LTE_MeasGapConfig_t *)NULL,
                                          (LTE_MobilityControlInfo_t *)NULL,
@@ -2655,6 +2653,7 @@ rrc_eNB_generate_defaultRRCConnectionReconfiguration(const protocol_ctxt_t *cons
   /* for no gcc warnings */
   (void)dedicatedInfoNas;
   LTE_C_RNTI_t                           *cba_RNTI                         = NULL;
+  int                                    x2_enabled;
   uint8_t xid = rrc_eNB_get_next_transaction_identifier(ctxt_pP->module_id);   //Transaction_id,
 #ifdef CBA
   //struct PUSCH_CBAConfigDedicated_vlola  *pusch_CBAConfigDedicated_vlola;
@@ -3159,6 +3158,8 @@ rrc_eNB_generate_defaultRRCConnectionReconfiguration(const protocol_ctxt_t *cons
     dedicatedInfoNASList = NULL;
   }
 
+  x2_enabled = is_x2ap_enabled();
+
   memset(buffer, 0, RRC_BUF_SIZE);
   size = do_RRCConnectionReconfiguration(ctxt_pP,
                                          buffer,
@@ -3171,10 +3172,10 @@ rrc_eNB_generate_defaultRRCConnectionReconfiguration(const protocol_ctxt_t *cons
                                          //#ifdef EXMIMO_IOT
                                          //                                         NULL, NULL, NULL,NULL,
                                          //#else
-                                         (LTE_MeasObjectToAddModList_t *)MeasObj_list,
-                                         (LTE_ReportConfigToAddModList_t *)ReportConfig_list,
-                                         (LTE_QuantityConfig_t *)quantityConfig,
-                                         (LTE_MeasIdToAddModList_t *)MeasId_list,
+                                         x2_enabled ? (LTE_MeasObjectToAddModList_t *)MeasObj_list : NULL,
+                                         x2_enabled ? (LTE_ReportConfigToAddModList_t *)ReportConfig_list : NULL,
+                                         x2_enabled ? (LTE_QuantityConfig_t *)quantityConfig : NULL,
+                                         x2_enabled ? (LTE_MeasIdToAddModList_t *)MeasId_list : NULL,
                                          //#endif
                                          (LTE_MAC_MainConfig_t *)mac_MainConfig,
                                          (LTE_MeasGapConfig_t *)NULL,
@@ -3285,6 +3286,7 @@ flexran_rrc_eNB_generate_defaultRRCConnectionReconfiguration(const protocol_ctxt
   /* for no gcc warnings */
   (void)dedicatedInfoNas;
   LTE_C_RNTI_t                           *cba_RNTI                         = NULL;
+  int                                    x2_enabled;
   uint8_t xid = rrc_eNB_get_next_transaction_identifier(ctxt_pP->module_id);   //Transaction_id,
 #ifdef CBA
   //struct PUSCH_CBAConfigDedicated_vlola  *pusch_CBAConfigDedicated_vlola;
@@ -3652,6 +3654,8 @@ flexran_rrc_eNB_generate_defaultRRCConnectionReconfiguration(const protocol_ctxt
     dedicatedInfoNASList = NULL;
   }
 
+  x2_enabled = is_x2ap_enabled();
+
   memset(buffer, 0, RRC_BUF_SIZE);
   size = do_RRCConnectionReconfiguration(ctxt_pP,
                                          buffer,
@@ -3664,10 +3668,10 @@ flexran_rrc_eNB_generate_defaultRRCConnectionReconfiguration(const protocol_ctxt
                                          // #ifdef EXMIMO_IOT
                                          //                                          NULL, NULL, NULL,NULL,
                                          // #else
-                                         (LTE_MeasObjectToAddModList_t *)MeasObj_list,
-                                         (LTE_ReportConfigToAddModList_t *)ReportConfig_list,
-                                         (LTE_QuantityConfig_t *)quantityConfig,
-                                         (LTE_MeasIdToAddModList_t *)MeasId_list,
+                                         x2_enabled ? (LTE_MeasObjectToAddModList_t *)MeasObj_list : NULL,
+                                         x2_enabled ? (LTE_ReportConfigToAddModList_t *)ReportConfig_list : NULL,
+                                         x2_enabled ? (LTE_QuantityConfig_t *)quantityConfig : NULL,
+                                         x2_enabled ? (LTE_MeasIdToAddModList_t *)MeasId_list : NULL,
                                          // #endif
                                          (LTE_MAC_MainConfig_t *)mac_MainConfig,
                                          (LTE_MeasGapConfig_t *)NULL,
@@ -3914,6 +3918,10 @@ rrc_eNB_process_MeasurementReport(
   if (!(measResults2->measId == 4))
     return;
 
+  /* if X2AP is disabled, do nothing */
+  if (!is_x2ap_enabled())
+    return;
+
   LOG_D(RRC, "A3 event is triggered...\n");
 
   /* if the UE is not in handover mode, start handover procedure */
@@ -4126,10 +4134,9 @@ void rrc_eNB_process_handoverCommand(
   ue_context->ue_context.handover_info->size = size;
 }
 
-#if defined(ENABLE_USE_MME)
 void rrc_eNB_handover_ue_context_release(
-protocol_ctxt_t *const ctxt_pP,
-struct rrc_eNB_ue_context_s *ue_context_p) {
+        protocol_ctxt_t *const ctxt_pP,
+        struct rrc_eNB_ue_context_s *ue_context_p) {
   int e_rab = 0;
   //MessageDef *msg_release_p = NULL;
   MessageDef *msg_delete_tunnels_p = NULL;
@@ -4162,7 +4169,16 @@ struct rrc_eNB_ue_context_s *ue_context_p) {
     rrc_eNB_S1AP_remove_ue_ids(RC.rrc[ctxt_pP->module_id], rrc_ue_s1ap_ids);
   }
 }
-#endif /* defined(ENABLE_USE_MME) */
+
+/* This function may be incorrect. */
+void rrc_eNB_handover_cancel(
+        protocol_ctxt_t              *const ctxt_pP,
+        struct rrc_eNB_ue_context_s  *ue_context_p) {
+  int s1_cause = 1;                        /* 1 = tx2relocoverall-expiry */
+
+  rrc_eNB_send_S1AP_UE_CONTEXT_RELEASE_REQ(ctxt_pP->module_id, ue_context_p,
+      S1AP_CAUSE_RADIO_NETWORK, s1_cause);
+}
 
 void
 check_handovers(
@@ -4293,6 +4309,7 @@ rrc_eNB_generate_HO_RRCConnectionReconfiguration(const protocol_ctxt_t *const ct
   /* for no gcc warnings */
   (void)dedicatedInfoNas;
   LTE_C_RNTI_t                       *cba_RNTI                         = NULL;
+  int                                x2_enabled;
   uint8_t xid = rrc_eNB_get_next_transaction_identifier(ctxt_pP->module_id);   //Transaction_id,
 #ifdef CBA
   //struct PUSCH_CBAConfigDedicated_vlola  *pusch_CBAConfigDedicated_vlola;
@@ -5049,6 +5066,9 @@ rrc_eNB_generate_HO_RRCConnectionReconfiguration(const protocol_ctxt_t *const ct
   }
 
 #endif
+
+  x2_enabled = is_x2ap_enabled();
+
   memset(buffer, 0, RRC_BUF_SIZE);
   char rrc_buf[1000 /* arbitrary, should be big enough, has to be less than size of return buf by a few bits/bytes */];
   int rrc_size;
@@ -5063,10 +5083,10 @@ rrc_eNB_generate_HO_RRCConnectionReconfiguration(const protocol_ctxt_t *const ct
              //#ifdef EXMIMO_IOT
              //                                         NULL, NULL, NULL,NULL,
              //#else
-             (LTE_MeasObjectToAddModList_t *)MeasObj_list,
-             (LTE_ReportConfigToAddModList_t *)ReportConfig_list,
-             (LTE_QuantityConfig_t *)quantityConfig,
-             (LTE_MeasIdToAddModList_t *)MeasId_list,
+             x2_enabled ? (LTE_MeasObjectToAddModList_t *)MeasObj_list : NULL,
+             x2_enabled ? (LTE_ReportConfigToAddModList_t *)ReportConfig_list : NULL,
+             x2_enabled ? (LTE_QuantityConfig_t *)quantityConfig : NULL,
+             x2_enabled ? (LTE_MeasIdToAddModList_t *)MeasId_list : NULL,
              //#endif
              (LTE_MAC_MainConfig_t *)mac_MainConfig,
              (LTE_MeasGapConfig_t *)NULL,
@@ -5168,7 +5188,8 @@ rrc_eNB_configure_rbs_handover(struct rrc_eNB_ue_context_s *ue_context_p, protoc
                           , 0, 0
 #endif
                          );
-#if defined(ENABLE_USE_MME)
+
+  if (EPC_MODE_ENABLED) {
     rrc_eNB_process_security (
       ctxt_pP,
       ue_context_p,
@@ -5181,7 +5202,7 @@ rrc_eNB_configure_rbs_handover(struct rrc_eNB_ue_context_s *ue_context_p, protoc
       ctxt_pP,
       ue_context_p,
       FALSE);
-#endif
+  }
 
   // Add a new user (called during the HO procedure)
   LOG_I(RRC, "rrc_eNB_target_add_ue_handover module_id %d rnti %d\n", ctxt_pP->module_id, ctxt_pP->rnti);
@@ -5229,882 +5250,100 @@ rrc_eNB_configure_rbs_handover(struct rrc_eNB_ue_context_s *ue_context_p, protoc
 #endif
 }
 
-#if 0
-// 5.3.5.4 LTE_RRCConnectionReconfiguration including the mobilityControlInfo to prepare the UE handover
 //-----------------------------------------------------------------------------
+/*
+* TODO: * add function description
+*       * format the function correctly
+*/
 void
-rrc_eNB_generate_RRCConnectionReconfiguration_handover(
+rrc_eNB_process_RRCConnectionReconfigurationComplete(
   const protocol_ctxt_t *const ctxt_pP,
-  rrc_eNB_ue_context_t           *const ue_context_pP,
-  uint8_t                *const nas_pdu,
-  const uint32_t                nas_length
+  rrc_eNB_ue_context_t        *ue_context_pP,
+  const uint8_t xid
 )
 //-----------------------------------------------------------------------------
 {
-  T(T_ENB_RRC_CONNECTION_RECONFIGURATION, T_INT(ctxt_pP->module_id), T_INT(ctxt_pP->frame),
+  int                                 i, drb_id;
+  int                                 oip_ifup = 0;
+  int                                 dest_ip_offset = 0;
+  uint8_t                            *kRRCenc = NULL;
+  uint8_t                            *kRRCint = NULL;
+  uint8_t                            *kUPenc = NULL;
+  ue_context_pP->ue_context.ue_reestablishment_timer = 0;
+  LTE_DRB_ToAddModList_t                 *DRB_configList = ue_context_pP->ue_context.DRB_configList2[xid];
+  LTE_SRB_ToAddModList_t                 *SRB_configList = ue_context_pP->ue_context.SRB_configList2[xid];
+  LTE_DRB_ToReleaseList_t                *DRB_Release_configList2 = ue_context_pP->ue_context.DRB_Release_configList2[xid];
+  LTE_DRB_Identity_t                     *drb_id_p      = NULL;
+  T(T_ENB_RRC_CONNECTION_RECONFIGURATION_COMPLETE, T_INT(ctxt_pP->module_id), T_INT(ctxt_pP->frame),
     T_INT(ctxt_pP->subframe), T_INT(ctxt_pP->rnti));
-  uint8_t                             buffer[RRC_BUF_SIZE];
-  int                                 i;
-  uint8_t                             rv[2];
-  uint16_t                            Idx;
-  // configure SRB1/SRB2, PhysicalConfigDedicated, LTE_MAC_MainConfig for UE
-  eNB_RRC_INST                       *rrc_inst = RC.rrc[ctxt_pP->module_id];
-  struct LTE_PhysicalConfigDedicated    **physicalConfigDedicated = &ue_context_pP->ue_context.physicalConfigDedicated;
-  struct LTE_SRB_ToAddMod                *SRB2_config;
-  struct LTE_SRB_ToAddMod__rlc_Config    *SRB2_rlc_config;
-  struct LTE_SRB_ToAddMod__logicalChannelConfig *SRB2_lchan_config;
-  struct LTE_LogicalChannelConfig__ul_SpecificParameters *SRB2_ul_SpecificParameters;
-  LTE_LogicalChannelConfig_t             *SRB1_logicalChannelConfig = NULL;
-  LTE_SRB_ToAddModList_t                 *SRB_configList = ue_context_pP->ue_context.SRB_configList;    // not used in this context: may be removed
-  LTE_SRB_ToAddModList_t                 *SRB_configList2;
-  struct LTE_DRB_ToAddMod                *DRB_config;
-  struct LTE_RLC_Config                  *DRB_rlc_config;
-  struct LTE_PDCP_Config                 *DRB_pdcp_config;
-  struct LTE_PDCP_Config__rlc_UM         *PDCP_rlc_UM;
-  struct LTE_LogicalChannelConfig        *DRB_lchan_config;
-  struct LTE_LogicalChannelConfig__ul_SpecificParameters *DRB_ul_SpecificParameters;
-  LTE_DRB_ToAddModList_t                 *DRB_configList2;
-  LTE_MAC_MainConfig_t                   *mac_MainConfig;
-  LTE_MeasObjectToAddModList_t           *MeasObj_list;
-  LTE_MeasObjectToAddMod_t               *MeasObj;
-  LTE_ReportConfigToAddModList_t         *ReportConfig_list;
-  LTE_ReportConfigToAddMod_t             *ReportConfig_per, *ReportConfig_A1,
-                                         *ReportConfig_A2, *ReportConfig_A3, *ReportConfig_A4, *ReportConfig_A5;
-  LTE_MeasIdToAddModList_t               *MeasId_list;
-  LTE_MeasIdToAddMod_t                   *MeasId0, *MeasId1, *MeasId2, *MeasId3, *MeasId4, *MeasId5;
-  LTE_QuantityConfig_t                   *quantityConfig;
-  LTE_MobilityControlInfo_t              *mobilityInfo;
-  // HandoverCommand_t handoverCommand;
-  //uint8_t                             sourceModId =
-  //  get_adjacent_cell_mod_id(ue_context_pP->ue_context.handover_info->as_context.reestablishmentInfo->sourcePhysCellId);
-#if (LTE_RRC_VERSION >= MAKE_VERSION(9, 0, 0))
-  long                               *sr_ProhibitTimer_r9;
-#endif
-  long                               *logicalchannelgroup, *logicalchannelgroup_drb;
-  long                               *maxHARQ_Tx, *periodicBSR_Timer;
-  // LTE_RSRP_Range_t *rsrp;
-  struct LTE_MeasConfig__speedStatePars  *Sparams;
-  LTE_CellsToAddMod_t                    *CellToAdd;
-  LTE_CellsToAddModList_t                *CellsToAddModList;
-  // srb 1: for HO
-  struct LTE_SRB_ToAddMod                *SRB1_config;
-  struct LTE_SRB_ToAddMod__rlc_Config    *SRB1_rlc_config;
-  struct LTE_SRB_ToAddMod__logicalChannelConfig *SRB1_lchan_config;
-  struct LTE_LogicalChannelConfig__ul_SpecificParameters *SRB1_ul_SpecificParameters;
-  // phy config dedicated
-  LTE_PhysicalConfigDedicated_t          *physicalConfigDedicated2;
-  struct LTE_RRCConnectionReconfiguration_r8_IEs__dedicatedInfoNASList *dedicatedInfoNASList;
-  protocol_ctxt_t                     ctxt;
-  LOG_D(RRC, "[eNB %d] Frame %d: handover preparation: get the newSourceUEIdentity (C-RNTI): ",
-        ctxt_pP->module_id, ctxt_pP->frame);
 
-  for (i = 0; i < 2; i++) {
-    rv[i] = taus() & 0xff;
-    LOG_D(RRC, " %x.", rv[i]);
+  /* Derive the keys from kenb */
+  if (DRB_configList != NULL) {
+    derive_key_up_enc(ue_context_pP->ue_context.ciphering_algorithm,
+                      ue_context_pP->ue_context.kenb, &kUPenc);
   }
 
-  LOG_D(RRC, "[eNB %d] Frame %d : handover reparation: add target eNB SRB1 and PHYConfigDedicated reconfiguration\n",
-        ctxt_pP->module_id, ctxt_pP->frame);
-  // 1st: reconfigure SRB
-  SRB_configList2 = CALLOC(1, sizeof(*SRB_configList));
-  SRB1_config = CALLOC(1, sizeof(*SRB1_config));
-  SRB1_config->srb_Identity = 1;
-  SRB1_rlc_config = CALLOC(1, sizeof(*SRB1_rlc_config));
-  SRB1_config->rlc_Config = SRB1_rlc_config;
-  SRB1_rlc_config->present = LTE_SRB_ToAddMod__rlc_Config_PR_explicitValue;
-  SRB1_rlc_config->choice.explicitValue.present = LTE_RLC_Config_PR_am;
-  SRB1_rlc_config->choice.explicitValue.choice.am.ul_AM_RLC.t_PollRetransmit = LTE_T_PollRetransmit_ms15;
-  SRB1_rlc_config->choice.explicitValue.choice.am.ul_AM_RLC.pollPDU = LTE_PollPDU_p8;
-  SRB1_rlc_config->choice.explicitValue.choice.am.ul_AM_RLC.pollByte = LTE_PollByte_kB1000;
-  SRB1_rlc_config->choice.explicitValue.choice.am.ul_AM_RLC.maxRetxThreshold = LTE_UL_AM_RLC__maxRetxThreshold_t16;
-  SRB1_rlc_config->choice.explicitValue.choice.am.dl_AM_RLC.t_Reordering = LTE_T_Reordering_ms35;
-  SRB1_rlc_config->choice.explicitValue.choice.am.dl_AM_RLC.t_StatusProhibit = LTE_T_StatusProhibit_ms10;
-  SRB1_lchan_config = CALLOC(1, sizeof(*SRB1_lchan_config));
-  SRB1_config->logicalChannelConfig = SRB1_lchan_config;
-  SRB1_lchan_config->present = LTE_SRB_ToAddMod__logicalChannelConfig_PR_explicitValue;
-  SRB1_ul_SpecificParameters = CALLOC(1, sizeof(*SRB1_ul_SpecificParameters));
-  SRB1_lchan_config->choice.explicitValue.ul_SpecificParameters = SRB1_ul_SpecificParameters;
-  SRB1_ul_SpecificParameters->priority = 1;
-  //assign_enum(&SRB1_ul_SpecificParameters->prioritisedBitRate,LogicalChannelConfig__ul_SpecificParameters__prioritisedBitRate_infinity);
-  SRB1_ul_SpecificParameters->prioritisedBitRate =
-    LTE_LogicalChannelConfig__ul_SpecificParameters__prioritisedBitRate_infinity;
-  //assign_enum(&SRB1_ul_SpecificParameters->bucketSizeDuration,LogicalChannelConfig__ul_SpecificParameters__bucketSizeDuration_ms50);
-  SRB1_ul_SpecificParameters->bucketSizeDuration =
-    LTE_LogicalChannelConfig__ul_SpecificParameters__bucketSizeDuration_ms50;
-  logicalchannelgroup = CALLOC(1, sizeof(long));
-  *logicalchannelgroup = 0;
-  SRB1_ul_SpecificParameters->logicalChannelGroup = logicalchannelgroup;
-  ASN_SEQUENCE_ADD(&SRB_configList2->list, SRB1_config);
-  //2nd: now reconfigure phy config dedicated
-  physicalConfigDedicated2 = CALLOC(1, sizeof(*physicalConfigDedicated2));
-  *physicalConfigDedicated = physicalConfigDedicated2;
-  physicalConfigDedicated2->pdsch_ConfigDedicated =
-    CALLOC(1, sizeof(*physicalConfigDedicated2->pdsch_ConfigDedicated));
-  physicalConfigDedicated2->pucch_ConfigDedicated =
-    CALLOC(1, sizeof(*physicalConfigDedicated2->pucch_ConfigDedicated));
-  physicalConfigDedicated2->pusch_ConfigDedicated =
-    CALLOC(1, sizeof(*physicalConfigDedicated2->pusch_ConfigDedicated));
-  physicalConfigDedicated2->uplinkPowerControlDedicated =
-    CALLOC(1, sizeof(*physicalConfigDedicated2->uplinkPowerControlDedicated));
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUCCH =
-    CALLOC(1, sizeof(*physicalConfigDedicated2->tpc_PDCCH_ConfigPUCCH));
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUSCH =
-    CALLOC(1, sizeof(*physicalConfigDedicated2->tpc_PDCCH_ConfigPUSCH));
-  physicalConfigDedicated2->cqi_ReportConfig = NULL;  //CALLOC(1,sizeof(*physicalConfigDedicated2->cqi_ReportConfig));
-  physicalConfigDedicated2->soundingRS_UL_ConfigDedicated = CALLOC(1,sizeof(*physicalConfigDedicated2->soundingRS_UL_ConfigDedicated));
-  physicalConfigDedicated2->antennaInfo = CALLOC(1, sizeof(*physicalConfigDedicated2->antennaInfo));
-  physicalConfigDedicated2->schedulingRequestConfig =
-    CALLOC(1, sizeof(*physicalConfigDedicated2->schedulingRequestConfig));
-  // PDSCH
-  //assign_enum(&physicalConfigDedicated2->pdsch_ConfigDedicated->p_a,
-  //          PDSCH_ConfigDedicated__p_a_dB0);
-  physicalConfigDedicated2->pdsch_ConfigDedicated->p_a = LTE_PDSCH_ConfigDedicated__p_a_dB0;
-  // PUCCH
-  physicalConfigDedicated2->pucch_ConfigDedicated->ackNackRepetition.present =
-    LTE_PUCCH_ConfigDedicated__ackNackRepetition_PR_release;
-  physicalConfigDedicated2->pucch_ConfigDedicated->ackNackRepetition.choice.release = 0;
-  physicalConfigDedicated2->pucch_ConfigDedicated->tdd_AckNackFeedbackMode = NULL;    //PUCCH_ConfigDedicated__tdd_AckNackFeedbackMode_multiplexing;
-  // Pusch_config_dedicated
-  physicalConfigDedicated2->pusch_ConfigDedicated->betaOffset_ACK_Index = 0;  // 2.00
-  physicalConfigDedicated2->pusch_ConfigDedicated->betaOffset_RI_Index = 0;   // 1.25
-  physicalConfigDedicated2->pusch_ConfigDedicated->betaOffset_CQI_Index = 8;  // 2.25
-  // UplinkPowerControlDedicated
-  physicalConfigDedicated2->uplinkPowerControlDedicated->p0_UE_PUSCH = 0; // 0 dB
-  //assign_enum(&physicalConfigDedicated2->uplinkPowerControlDedicated->deltaMCS_Enabled,
-  // UplinkPowerControlDedicated__deltaMCS_Enabled_en1);
-  physicalConfigDedicated2->uplinkPowerControlDedicated->deltaMCS_Enabled =
-    LTE_UplinkPowerControlDedicated__deltaMCS_Enabled_en1;
-  physicalConfigDedicated2->uplinkPowerControlDedicated->accumulationEnabled = 1; // should be TRUE in order to have 0dB power offset
-  physicalConfigDedicated2->uplinkPowerControlDedicated->p0_UE_PUCCH = 0; // 0 dB
-  physicalConfigDedicated2->uplinkPowerControlDedicated->pSRS_Offset = 0; // 0 dB
-  physicalConfigDedicated2->uplinkPowerControlDedicated->filterCoefficient =
-    CALLOC(1, sizeof(*physicalConfigDedicated2->uplinkPowerControlDedicated->filterCoefficient));
-  //  assign_enum(physicalConfigDedicated2->uplinkPowerControlDedicated->filterCoefficient,FilterCoefficient_fc4); // fc4 dB
-  *physicalConfigDedicated2->uplinkPowerControlDedicated->filterCoefficient = LTE_FilterCoefficient_fc4;  // fc4 dB
-  // TPC-PDCCH-Config
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUCCH->present = LTE_TPC_PDCCH_Config_PR_setup;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUCCH->choice.setup.tpc_Index.present = LTE_TPC_Index_PR_indexOfFormat3;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUCCH->choice.setup.tpc_Index.choice.indexOfFormat3 = 1;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUCCH->choice.setup.tpc_RNTI.buf = CALLOC(1, 2);
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUCCH->choice.setup.tpc_RNTI.size = 2;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUCCH->choice.setup.tpc_RNTI.buf[0] = 0x12;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUCCH->choice.setup.tpc_RNTI.buf[1] = 0x34 + ue_context_pP->local_uid;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUCCH->choice.setup.tpc_RNTI.bits_unused = 0;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUSCH->present = LTE_TPC_PDCCH_Config_PR_setup;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUSCH->choice.setup.tpc_Index.present = LTE_TPC_Index_PR_indexOfFormat3;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUSCH->choice.setup.tpc_Index.choice.indexOfFormat3 = 1;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUSCH->choice.setup.tpc_RNTI.buf = CALLOC(1, 2);
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUSCH->choice.setup.tpc_RNTI.size = 2;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUSCH->choice.setup.tpc_RNTI.buf[0] = 0x22;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUSCH->choice.setup.tpc_RNTI.buf[1] = 0x34 + ue_context_pP->local_uid;
-  physicalConfigDedicated2->tpc_PDCCH_ConfigPUSCH->choice.setup.tpc_RNTI.bits_unused = 0;
-  //AntennaInfoDedicated
-  physicalConfigDedicated2->antennaInfo = CALLOC(1, sizeof(*physicalConfigDedicated2->antennaInfo));
-  physicalConfigDedicated2->antennaInfo->present = LTE_PhysicalConfigDedicated__antennaInfo_PR_explicitValue;
-  physicalConfigDedicated2->antennaInfo->choice.explicitValue.ue_TransmitAntennaSelection.present =
-    LTE_AntennaInfoDedicated__ue_TransmitAntennaSelection_PR_release;
-  physicalConfigDedicated2->antennaInfo->choice.explicitValue.ue_TransmitAntennaSelection.choice.release = 0;
-  // SchedulingRequestConfig
-  physicalConfigDedicated2->schedulingRequestConfig->present = LTE_SchedulingRequestConfig_PR_setup;
-  physicalConfigDedicated2->schedulingRequestConfig->choice.setup.sr_PUCCH_ResourceIndex = ue_context_pP->local_uid;
+  derive_key_rrc_enc(ue_context_pP->ue_context.ciphering_algorithm,
+                     ue_context_pP->ue_context.kenb, &kRRCenc);
+  derive_key_rrc_int(ue_context_pP->ue_context.integrity_algorithm,
+                     ue_context_pP->ue_context.kenb, &kRRCint);
+  // Refresh SRBs/DRBs
+  MSC_LOG_TX_MESSAGE(
+    MSC_RRC_ENB,
+    MSC_PDCP_ENB,
+    NULL,
+    0,
+    MSC_AS_TIME_FMT" CONFIG_REQ UE %x DRB (security unchanged)",
+    MSC_AS_TIME_ARGS(ctxt_pP),
+    ue_context_pP->ue_context.rnti);
+  rrc_pdcp_config_asn1_req(
+    ctxt_pP,
+    SRB_configList, //NULL,  //LG-RK 14/05/2014 SRB_configList,
+    DRB_configList,
+    //    (LTE_DRB_ToReleaseList_t *) NULL,
+    DRB_Release_configList2,
+    /*RC.rrc[ctxt_pP->module_id]->ciphering_algorithm[ue_mod_idP] |
+             (RC.rrc[ctxt_pP->module_id]->integrity_algorithm[ue_mod_idP] << 4),
+     */
+    0xff, // already configured during the securitymodecommand
+    kRRCenc,
+    kRRCint,
+    kUPenc
+#if (LTE_RRC_VERSION >= MAKE_VERSION(9, 0, 0))
+    , (LTE_PMCH_InfoList_r9_t *) NULL
+#endif
+    ,NULL);
+  // Refresh SRBs/DRBs
+  rrc_rlc_config_asn1_req(
+    ctxt_pP,
+    SRB_configList, // NULL,  //LG-RK 14/05/2014 SRB_configList,
+    DRB_configList,
+    //    (LTE_DRB_ToReleaseList_t *) NULL
+    DRB_Release_configList2
+#if (LTE_RRC_VERSION >= MAKE_VERSION(9, 0, 0))
+    , (LTE_PMCH_InfoList_r9_t *) NULL
+    , 0, 0
+#endif
+  );
 
-  if (rrc_inst->carrier[0].sib1->tdd_Config==NULL) {  // FD
-    physicalConfigDedicated2->schedulingRequestConfig->choice.setup.sr_ConfigIndex = 5 + (ue_context_pP->local_uid %
-        10);   // Isr = 5 (every 10 subframes, offset=2+UE_id mod3)
+  // set the SRB active in Ue context
+  if (SRB_configList != NULL) {
+    for (i = 0; (i < SRB_configList->list.count) && (i < 3); i++) {
+      if (SRB_configList->list.array[i]->srb_Identity == 1 ) {
+        ue_context_pP->ue_context.Srb1.Active=1;
+      } else if (SRB_configList->list.array[i]->srb_Identity == 2 )  {
+        ue_context_pP->ue_context.Srb2.Active=1;
+        ue_context_pP->ue_context.Srb2.Srb_info.Srb_id=2;
+        LOG_I(RRC,"[eNB %d] Frame  %d CC %d : SRB2 is now active\n",
+              ctxt_pP->module_id,
+              ctxt_pP->frame,
+              ue_context_pP->ue_context.primaryCC_id);
       } else {
-    switch (rrc_inst->carrier[0].sib1->tdd_Config->subframeAssignment) {
-      case 1:
-        physicalConfigDedicated2->schedulingRequestConfig->choice.setup.sr_ConfigIndex = 7 + (ue_context_pP->local_uid & 1) + ((
-              ue_context_pP->local_uid & 3) >> 1) * 5;    // Isr = 5 (every 10 subframes, offset=2 for UE0, 3 for UE1, 7 for UE2, 8 for UE3 , 2 for UE4 etc..)
-        break;
-
-      case 3:
-        physicalConfigDedicated2->schedulingRequestConfig->choice.setup.sr_ConfigIndex = 7 + (ue_context_pP->local_uid %
-            3);    // Isr = 5 (every 10 subframes, offset=2 for UE0, 3 for UE1, 3 for UE2, 2 for UE3 , etc..)
-        break;
-
-      case 4:
-        physicalConfigDedicated2->schedulingRequestConfig->choice.setup.sr_ConfigIndex = 7 + (ue_context_pP->local_uid &
-            1);    // Isr = 5 (every 10 subframes, offset=2 for UE0, 3 for UE1, 3 for UE2, 2 for UE3 , etc..)
-        break;
-
-      default:
-        physicalConfigDedicated2->schedulingRequestConfig->choice.setup.sr_ConfigIndex = 7; // Isr = 5 (every 10 subframes, offset=2 for all UE0 etc..)
-        break;
-    }
-  }
-
-  //  assign_enum(&physicalConfigDedicated2->schedulingRequestConfig->choice.setup.dsr_TransMax,
-  //SchedulingRequestConfig__setup__dsr_TransMax_n4);
-  //  assign_enum(&physicalConfigDedicated2->schedulingRequestConfig->choice.setup.dsr_TransMax = SchedulingRequestConfig__setup__dsr_TransMax_n4;
-  physicalConfigDedicated2->schedulingRequestConfig->choice.setup.dsr_TransMax =
-    LTE_SchedulingRequestConfig__setup__dsr_TransMax_n4;
-  LOG_D(RRC,
-        "handover_config [FRAME %05d][RRC_eNB][MOD %02d][][--- MAC_CONFIG_REQ  (SRB1 UE %x) --->][MAC_eNB][MOD %02d][]\n",
-        ctxt_pP->frame, ctxt_pP->module_id, ue_context_pP->ue_context.rnti, ctxt_pP->module_id);
-  rrc_mac_config_req_eNB(
-    ctxt_pP->module_id,
-    ue_context_pP->ue_context.primaryCC_id,
-    0,0,0,0,0,
-#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
-    0,
-#endif
-    ue_context_pP->ue_context.rnti,
-    (LTE_BCCH_BCH_Message_t *) NULL,
-    (LTE_RadioResourceConfigCommonSIB_t *) NULL,
-#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
-    (LTE_RadioResourceConfigCommonSIB_t *) NULL,
-#endif
-    ue_context_pP->ue_context.physicalConfigDedicated,
-#if (LTE_RRC_VERSION >= MAKE_VERSION(10, 0, 0))
-    (LTE_SCellToAddMod_r10_t *)NULL,
-    //(struct LTE_PhysicalConfigDedicatedSCell_r10 *)NULL,
-#endif
-    (LTE_MeasObjectToAddMod_t **) NULL,
-    ue_context_pP->ue_context.mac_MainConfig,
-    1,
-    SRB1_logicalChannelConfig,
-    ue_context_pP->ue_context.measGapConfig,
-    (LTE_TDD_Config_t *) NULL,
-    (LTE_MobilityControlInfo_t *) NULL,
-    (LTE_SchedulingInfoList_t *) NULL,
-    0,
-    NULL,
-    NULL,
-    (LTE_MBSFN_SubframeConfigList_t *) NULL
-#if (LTE_RRC_VERSION >= MAKE_VERSION(9, 0, 0))
-    , 0, (LTE_MBSFN_AreaInfoList_r9_t *) NULL, (LTE_PMCH_InfoList_r9_t *) NULL
-#endif
-#if (LTE_RRC_VERSION >= MAKE_VERSION(13, 0, 0))
-    ,
-    (LTE_SystemInformationBlockType1_v1310_IEs_t *)NULL
-#endif
-  );
-  // Configure target eNB SRB2
-  /// SRB2
-  SRB2_config = CALLOC(1, sizeof(*SRB2_config));
-  SRB_configList2 = CALLOC(1, sizeof(*SRB_configList2));
-  memset(SRB_configList2, 0, sizeof(*SRB_configList2));
-  SRB2_config->srb_Identity = 2;
-  SRB2_rlc_config = CALLOC(1, sizeof(*SRB2_rlc_config));
-  SRB2_config->rlc_Config = SRB2_rlc_config;
-  SRB2_rlc_config->present = LTE_SRB_ToAddMod__rlc_Config_PR_explicitValue;
-  SRB2_rlc_config->choice.explicitValue.present = LTE_RLC_Config_PR_am;
-  SRB2_rlc_config->choice.explicitValue.choice.am.ul_AM_RLC.t_PollRetransmit = LTE_T_PollRetransmit_ms15;
-  SRB2_rlc_config->choice.explicitValue.choice.am.ul_AM_RLC.pollPDU = LTE_PollPDU_p8;
-  SRB2_rlc_config->choice.explicitValue.choice.am.ul_AM_RLC.pollByte = LTE_PollByte_kB1000;
-  SRB2_rlc_config->choice.explicitValue.choice.am.ul_AM_RLC.maxRetxThreshold = LTE_UL_AM_RLC__maxRetxThreshold_t32;
-  SRB2_rlc_config->choice.explicitValue.choice.am.dl_AM_RLC.t_Reordering = LTE_T_Reordering_ms35;
-  SRB2_rlc_config->choice.explicitValue.choice.am.dl_AM_RLC.t_StatusProhibit = LTE_T_StatusProhibit_ms10;
-  SRB2_lchan_config = CALLOC(1, sizeof(*SRB2_lchan_config));
-  SRB2_config->logicalChannelConfig = SRB2_lchan_config;
-  SRB2_lchan_config->present = LTE_SRB_ToAddMod__logicalChannelConfig_PR_explicitValue;
-  SRB2_ul_SpecificParameters = CALLOC(1, sizeof(*SRB2_ul_SpecificParameters));
-  SRB2_ul_SpecificParameters->priority = 1;
-  SRB2_ul_SpecificParameters->prioritisedBitRate =
-    LTE_LogicalChannelConfig__ul_SpecificParameters__prioritisedBitRate_infinity;
-  SRB2_ul_SpecificParameters->bucketSizeDuration =
-    LTE_LogicalChannelConfig__ul_SpecificParameters__bucketSizeDuration_ms50;
-  // LCG for CCCH and DCCH is 0 as defined in 36331
-  logicalchannelgroup = CALLOC(1, sizeof(long));
-  *logicalchannelgroup = 0;
-  SRB2_ul_SpecificParameters->logicalChannelGroup = logicalchannelgroup;
-  SRB2_lchan_config->choice.explicitValue.ul_SpecificParameters = SRB2_ul_SpecificParameters;
-  ASN_SEQUENCE_ADD(&SRB_configList->list, SRB2_config);
-  ASN_SEQUENCE_ADD(&SRB_configList2->list, SRB2_config);
-  // Configure target eNB DRB
-  DRB_configList2 = CALLOC(1, sizeof(*DRB_configList2));
-  /// DRB
-  DRB_config = CALLOC(1, sizeof(*DRB_config));
-  //DRB_config->drb_Identity = (LTE_DRB_Identity_t) 1; //allowed values 1..32
-  // NN: this is the 1st DRB for this ue, so set it to 1
-  DRB_config->drb_Identity = (LTE_DRB_Identity_t) 1;  // (ue_mod_idP+1); //allowed values 1..32
-  DRB_config->logicalChannelIdentity = CALLOC(1, sizeof(long));
-  *(DRB_config->logicalChannelIdentity) = (long)3;
-  DRB_rlc_config = CALLOC(1, sizeof(*DRB_rlc_config));
-  DRB_config->rlc_Config = DRB_rlc_config;
-  DRB_rlc_config->present = LTE_RLC_Config_PR_um_Bi_Directional;
-  DRB_rlc_config->choice.um_Bi_Directional.ul_UM_RLC.sn_FieldLength = LTE_SN_FieldLength_size10;
-  DRB_rlc_config->choice.um_Bi_Directional.dl_UM_RLC.sn_FieldLength = LTE_SN_FieldLength_size10;
-  DRB_rlc_config->choice.um_Bi_Directional.dl_UM_RLC.t_Reordering = LTE_T_Reordering_ms35;
-  DRB_pdcp_config = CALLOC(1, sizeof(*DRB_pdcp_config));
-  DRB_config->pdcp_Config = DRB_pdcp_config;
-  DRB_pdcp_config->discardTimer = NULL;
-  DRB_pdcp_config->rlc_AM = NULL;
-  PDCP_rlc_UM = CALLOC(1, sizeof(*PDCP_rlc_UM));
-  DRB_pdcp_config->rlc_UM = PDCP_rlc_UM;
-  PDCP_rlc_UM->pdcp_SN_Size = LTE_PDCP_Config__rlc_UM__pdcp_SN_Size_len12bits;
-  DRB_pdcp_config->headerCompression.present = LTE_PDCP_Config__headerCompression_PR_notUsed;
-  DRB_lchan_config = CALLOC(1, sizeof(*DRB_lchan_config));
-  DRB_config->logicalChannelConfig = DRB_lchan_config;
-  DRB_ul_SpecificParameters = CALLOC(1, sizeof(*DRB_ul_SpecificParameters));
-  DRB_lchan_config->ul_SpecificParameters = DRB_ul_SpecificParameters;
-  DRB_ul_SpecificParameters->priority = 2;    // lower priority than srb1, srb2
-  DRB_ul_SpecificParameters->prioritisedBitRate =
-    LTE_LogicalChannelConfig__ul_SpecificParameters__prioritisedBitRate_infinity;
-  DRB_ul_SpecificParameters->bucketSizeDuration =
-    LTE_LogicalChannelConfig__ul_SpecificParameters__bucketSizeDuration_ms50;
-  // LCG for DTCH can take the value from 1 to 3 as defined in 36331: normally controlled by upper layers (like RRM)
-  logicalchannelgroup_drb = CALLOC(1, sizeof(long));
-  *logicalchannelgroup_drb = 1;
-  DRB_ul_SpecificParameters->logicalChannelGroup = logicalchannelgroup_drb;
-  ASN_SEQUENCE_ADD(&DRB_configList2->list, DRB_config);
-  mac_MainConfig = CALLOC(1, sizeof(*mac_MainConfig));
-  ue_context_pP->ue_context.mac_MainConfig = mac_MainConfig;
-  mac_MainConfig->ul_SCH_Config = CALLOC(1, sizeof(*mac_MainConfig->ul_SCH_Config));
-  maxHARQ_Tx = CALLOC(1, sizeof(long));
-  *maxHARQ_Tx = LTE_MAC_MainConfig__ul_SCH_Config__maxHARQ_Tx_n5;
-  mac_MainConfig->ul_SCH_Config->maxHARQ_Tx = maxHARQ_Tx;
-  periodicBSR_Timer = CALLOC(1, sizeof(long));
-  *periodicBSR_Timer = LTE_PeriodicBSR_Timer_r12_sf64;
-  mac_MainConfig->ul_SCH_Config->periodicBSR_Timer = periodicBSR_Timer;
-  mac_MainConfig->ul_SCH_Config->retxBSR_Timer = LTE_RetxBSR_Timer_r12_sf320;
-  mac_MainConfig->ul_SCH_Config->ttiBundling = 0; // FALSE
-  mac_MainConfig->drx_Config = NULL;
-  mac_MainConfig->phr_Config = CALLOC(1, sizeof(*mac_MainConfig->phr_Config));
-  mac_MainConfig->phr_Config->present = LTE_MAC_MainConfig__phr_Config_PR_setup;
-  mac_MainConfig->phr_Config->choice.setup.periodicPHR_Timer = LTE_MAC_MainConfig__phr_Config__setup__periodicPHR_Timer_sf20; // sf20 = 20 subframes
-  mac_MainConfig->phr_Config->choice.setup.prohibitPHR_Timer = LTE_MAC_MainConfig__phr_Config__setup__prohibitPHR_Timer_sf20; // sf20 = 20 subframes
-  mac_MainConfig->phr_Config->choice.setup.dl_PathlossChange = LTE_MAC_MainConfig__phr_Config__setup__dl_PathlossChange_dB1;  // Value dB1 =1 dB, dB3 = 3 dB
-#if (LTE_RRC_VERSION >= MAKE_VERSION(9, 0, 0))
-  sr_ProhibitTimer_r9 = CALLOC(1, sizeof(long));
-  *sr_ProhibitTimer_r9 = 0;   // SR tx on PUCCH, Value in number of SR period(s). Value 0 = no timer for SR, Value 2= 2*SR
-  mac_MainConfig->ext1 = CALLOC(1, sizeof(struct LTE_MAC_MainConfig__ext1));
-  mac_MainConfig->ext1->sr_ProhibitTimer_r9 = sr_ProhibitTimer_r9;
-  //sps_RA_ConfigList_rlola = NULL;
-#endif
-  // Measurement ID list
-  MeasId_list = CALLOC(1, sizeof(*MeasId_list));
-  memset((void *)MeasId_list, 0, sizeof(*MeasId_list));
-  MeasId0 = CALLOC(1, sizeof(*MeasId0));
-  MeasId0->measId = 1;
-  MeasId0->measObjectId = 1;
-  MeasId0->reportConfigId = 1;
-  ASN_SEQUENCE_ADD(&MeasId_list->list, MeasId0);
-  MeasId1 = CALLOC(1, sizeof(*MeasId1));
-  MeasId1->measId = 2;
-  MeasId1->measObjectId = 1;
-  MeasId1->reportConfigId = 2;
-  ASN_SEQUENCE_ADD(&MeasId_list->list, MeasId1);
-  MeasId2 = CALLOC(1, sizeof(*MeasId2));
-  MeasId2->measId = 3;
-  MeasId2->measObjectId = 1;
-  MeasId2->reportConfigId = 3;
-  ASN_SEQUENCE_ADD(&MeasId_list->list, MeasId2);
-  MeasId3 = CALLOC(1, sizeof(*MeasId3));
-  MeasId3->measId = 4;
-  MeasId3->measObjectId = 1;
-  MeasId3->reportConfigId = 4;
-  ASN_SEQUENCE_ADD(&MeasId_list->list, MeasId3);
-  MeasId4 = CALLOC(1, sizeof(*MeasId4));
-  MeasId4->measId = 5;
-  MeasId4->measObjectId = 1;
-  MeasId4->reportConfigId = 5;
-  ASN_SEQUENCE_ADD(&MeasId_list->list, MeasId4);
-  MeasId5 = CALLOC(1, sizeof(*MeasId5));
-  MeasId5->measId = 6;
-  MeasId5->measObjectId = 1;
-  MeasId5->reportConfigId = 6;
-  ASN_SEQUENCE_ADD(&MeasId_list->list, MeasId5);
-  //  LTE_RRCConnectionReconfiguration->criticalExtensions.choice.c1.choice.rrcConnectionReconfiguration_r8.measConfig->measIdToAddModList = MeasId_list;
-  // Add one EUTRA Measurement Object
-  MeasObj_list = CALLOC(1, sizeof(*MeasObj_list));
-  memset((void *)MeasObj_list, 0, sizeof(*MeasObj_list));
-  // Configure MeasObject
-  MeasObj = CALLOC(1, sizeof(*MeasObj));
-  memset((void *)MeasObj, 0, sizeof(*MeasObj));
-  MeasObj->measObjectId = 1;
-  MeasObj->measObject.present = LTE_MeasObjectToAddMod__measObject_PR_measObjectEUTRA;
-  MeasObj->measObject.choice.measObjectEUTRA.carrierFreq = 36090;
-  MeasObj->measObject.choice.measObjectEUTRA.allowedMeasBandwidth = LTE_AllowedMeasBandwidth_mbw25;
-  MeasObj->measObject.choice.measObjectEUTRA.presenceAntennaPort1 = 1;
-  MeasObj->measObject.choice.measObjectEUTRA.neighCellConfig.buf = CALLOC(1, sizeof(uint8_t));
-  MeasObj->measObject.choice.measObjectEUTRA.neighCellConfig.buf[0] = 0;
-  MeasObj->measObject.choice.measObjectEUTRA.neighCellConfig.size = 1;
-  MeasObj->measObject.choice.measObjectEUTRA.neighCellConfig.bits_unused = 6;
-  MeasObj->measObject.choice.measObjectEUTRA.offsetFreq = NULL;   // Default is 15 or 0dB
-  MeasObj->measObject.choice.measObjectEUTRA.cellsToAddModList =
-    (LTE_CellsToAddModList_t *) CALLOC(1, sizeof(*CellsToAddModList));
-  CellsToAddModList = MeasObj->measObject.choice.measObjectEUTRA.cellsToAddModList;
-
-  // Add adjacent cell lists (6 per eNB)
-  for (i = 0; i < 6; i++) {
-    CellToAdd = (LTE_CellsToAddMod_t *) CALLOC(1, sizeof(*CellToAdd));
-    CellToAdd->cellIndex = i + 1;
-    CellToAdd->physCellId = get_adjacent_cell_id(ctxt_pP->module_id, i);
-    CellToAdd->cellIndividualOffset = LTE_Q_OffsetRange_dB0;
-    ASN_SEQUENCE_ADD(&CellsToAddModList->list, CellToAdd);
-  }
-
-  ASN_SEQUENCE_ADD(&MeasObj_list->list, MeasObj);
-  //  LTE_RRCConnectionReconfiguration->criticalExtensions.choice.c1.choice.rrcConnectionReconfiguration_r8.measConfig->measObjectToAddModList = MeasObj_list;
-  // Report Configurations for periodical, A1-A5 events
-  ReportConfig_list = CALLOC(1, sizeof(*ReportConfig_list));
-  ReportConfig_per = CALLOC(1, sizeof(*ReportConfig_per));
-  ReportConfig_A1 = CALLOC(1, sizeof(*ReportConfig_A1));
-  ReportConfig_A2 = CALLOC(1, sizeof(*ReportConfig_A2));
-  ReportConfig_A3 = CALLOC(1, sizeof(*ReportConfig_A3));
-  ReportConfig_A4 = CALLOC(1, sizeof(*ReportConfig_A4));
-  ReportConfig_A5 = CALLOC(1, sizeof(*ReportConfig_A5));
-  ReportConfig_per->reportConfigId = 1;
-  ReportConfig_per->reportConfig.present = LTE_ReportConfigToAddMod__reportConfig_PR_reportConfigEUTRA;
-  ReportConfig_per->reportConfig.choice.reportConfigEUTRA.triggerType.present =
-    LTE_ReportConfigEUTRA__triggerType_PR_periodical;
-  ReportConfig_per->reportConfig.choice.reportConfigEUTRA.triggerType.choice.periodical.purpose =
-    LTE_ReportConfigEUTRA__triggerType__periodical__purpose_reportStrongestCells;
-  ReportConfig_per->reportConfig.choice.reportConfigEUTRA.triggerQuantity = LTE_ReportConfigEUTRA__triggerQuantity_rsrp;
-  ReportConfig_per->reportConfig.choice.reportConfigEUTRA.reportQuantity = LTE_ReportConfigEUTRA__reportQuantity_both;
-  ReportConfig_per->reportConfig.choice.reportConfigEUTRA.maxReportCells = 2;
-  ReportConfig_per->reportConfig.choice.reportConfigEUTRA.reportInterval = LTE_ReportInterval_ms120;
-  ReportConfig_per->reportConfig.choice.reportConfigEUTRA.reportAmount = LTE_ReportConfigEUTRA__reportAmount_infinity;
-  ASN_SEQUENCE_ADD(&ReportConfig_list->list, ReportConfig_per);
-  ReportConfig_A1->reportConfigId = 2;
-  ReportConfig_A1->reportConfig.present = LTE_ReportConfigToAddMod__reportConfig_PR_reportConfigEUTRA;
-  ReportConfig_A1->reportConfig.choice.reportConfigEUTRA.triggerType.present =
-    LTE_ReportConfigEUTRA__triggerType_PR_event;
-  ReportConfig_A1->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.present =
-    LTE_ReportConfigEUTRA__triggerType__event__eventId_PR_eventA1;
-  ReportConfig_A1->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.choice.eventA1.
-  a1_Threshold.present = LTE_ThresholdEUTRA_PR_threshold_RSRP;
-  ReportConfig_A1->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.choice.eventA1.
-  a1_Threshold.choice.threshold_RSRP = 10;
-  ReportConfig_A1->reportConfig.choice.reportConfigEUTRA.triggerQuantity = LTE_ReportConfigEUTRA__triggerQuantity_rsrp;
-  ReportConfig_A1->reportConfig.choice.reportConfigEUTRA.reportQuantity = LTE_ReportConfigEUTRA__reportQuantity_both;
-  ReportConfig_A1->reportConfig.choice.reportConfigEUTRA.maxReportCells = 2;
-  ReportConfig_A1->reportConfig.choice.reportConfigEUTRA.reportInterval = LTE_ReportInterval_ms120;
-  ReportConfig_A1->reportConfig.choice.reportConfigEUTRA.reportAmount = LTE_ReportConfigEUTRA__reportAmount_infinity;
-  ASN_SEQUENCE_ADD(&ReportConfig_list->list, ReportConfig_A1);
-  ReportConfig_A2->reportConfigId = 3;
-  ReportConfig_A2->reportConfig.present = LTE_ReportConfigToAddMod__reportConfig_PR_reportConfigEUTRA;
-  ReportConfig_A2->reportConfig.choice.reportConfigEUTRA.triggerType.present =
-    LTE_ReportConfigEUTRA__triggerType_PR_event;
-  ReportConfig_A2->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.present =
-    LTE_ReportConfigEUTRA__triggerType__event__eventId_PR_eventA2;
-  ReportConfig_A2->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.choice.eventA2.
-  a2_Threshold.present = LTE_ThresholdEUTRA_PR_threshold_RSRP;
-  ReportConfig_A2->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.choice.eventA2.
-  a2_Threshold.choice.threshold_RSRP = 10;
-  ReportConfig_A2->reportConfig.choice.reportConfigEUTRA.triggerQuantity = LTE_ReportConfigEUTRA__triggerQuantity_rsrp;
-  ReportConfig_A2->reportConfig.choice.reportConfigEUTRA.reportQuantity = LTE_ReportConfigEUTRA__reportQuantity_both;
-  ReportConfig_A2->reportConfig.choice.reportConfigEUTRA.maxReportCells = 2;
-  ReportConfig_A2->reportConfig.choice.reportConfigEUTRA.reportInterval = LTE_ReportInterval_ms120;
-  ReportConfig_A2->reportConfig.choice.reportConfigEUTRA.reportAmount = LTE_ReportConfigEUTRA__reportAmount_infinity;
-  ASN_SEQUENCE_ADD(&ReportConfig_list->list, ReportConfig_A2);
-  ReportConfig_A3->reportConfigId = 4;
-  ReportConfig_A3->reportConfig.present = LTE_ReportConfigToAddMod__reportConfig_PR_reportConfigEUTRA;
-  ReportConfig_A3->reportConfig.choice.reportConfigEUTRA.triggerType.present =
-    LTE_ReportConfigEUTRA__triggerType_PR_event;
-  ReportConfig_A3->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.present =
-    LTE_ReportConfigEUTRA__triggerType__event__eventId_PR_eventA3;
-  ReportConfig_A3->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.choice.eventA3.a3_Offset =
-    10;
-  ReportConfig_A3->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.choice.
-  eventA3.reportOnLeave = 1;
-  ReportConfig_A3->reportConfig.choice.reportConfigEUTRA.triggerQuantity = LTE_ReportConfigEUTRA__triggerQuantity_rsrp;
-  ReportConfig_A3->reportConfig.choice.reportConfigEUTRA.reportQuantity = LTE_ReportConfigEUTRA__reportQuantity_both;
-  ReportConfig_A3->reportConfig.choice.reportConfigEUTRA.maxReportCells = 2;
-  ReportConfig_A3->reportConfig.choice.reportConfigEUTRA.reportInterval = LTE_ReportInterval_ms120;
-  ReportConfig_A3->reportConfig.choice.reportConfigEUTRA.reportAmount = LTE_ReportConfigEUTRA__reportAmount_infinity;
-  ASN_SEQUENCE_ADD(&ReportConfig_list->list, ReportConfig_A3);
-  ReportConfig_A4->reportConfigId = 5;
-  ReportConfig_A4->reportConfig.present = LTE_ReportConfigToAddMod__reportConfig_PR_reportConfigEUTRA;
-  ReportConfig_A4->reportConfig.choice.reportConfigEUTRA.triggerType.present =
-    LTE_ReportConfigEUTRA__triggerType_PR_event;
-  ReportConfig_A4->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.present =
-    LTE_ReportConfigEUTRA__triggerType__event__eventId_PR_eventA4;
-  ReportConfig_A4->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.choice.eventA4.
-  a4_Threshold.present = LTE_ThresholdEUTRA_PR_threshold_RSRP;
-  ReportConfig_A4->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.choice.eventA4.
-  a4_Threshold.choice.threshold_RSRP = 10;
-  ReportConfig_A4->reportConfig.choice.reportConfigEUTRA.triggerQuantity = LTE_ReportConfigEUTRA__triggerQuantity_rsrp;
-  ReportConfig_A4->reportConfig.choice.reportConfigEUTRA.reportQuantity = LTE_ReportConfigEUTRA__reportQuantity_both;
-  ReportConfig_A4->reportConfig.choice.reportConfigEUTRA.maxReportCells = 2;
-  ReportConfig_A4->reportConfig.choice.reportConfigEUTRA.reportInterval = LTE_ReportInterval_ms120;
-  ReportConfig_A4->reportConfig.choice.reportConfigEUTRA.reportAmount = LTE_ReportConfigEUTRA__reportAmount_infinity;
-  ASN_SEQUENCE_ADD(&ReportConfig_list->list, ReportConfig_A4);
-  ReportConfig_A5->reportConfigId = 6;
-  ReportConfig_A5->reportConfig.present = LTE_ReportConfigToAddMod__reportConfig_PR_reportConfigEUTRA;
-  ReportConfig_A5->reportConfig.choice.reportConfigEUTRA.triggerType.present =
-    LTE_ReportConfigEUTRA__triggerType_PR_event;
-  ReportConfig_A5->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.present =
-    LTE_ReportConfigEUTRA__triggerType__event__eventId_PR_eventA5;
-  ReportConfig_A5->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.choice.
-  eventA5.a5_Threshold1.present = LTE_ThresholdEUTRA_PR_threshold_RSRP;
-  ReportConfig_A5->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.choice.
-  eventA5.a5_Threshold2.present = LTE_ThresholdEUTRA_PR_threshold_RSRP;
-  ReportConfig_A5->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.choice.
-  eventA5.a5_Threshold1.choice.threshold_RSRP = 10;
-  ReportConfig_A5->reportConfig.choice.reportConfigEUTRA.triggerType.choice.event.eventId.choice.
-  eventA5.a5_Threshold2.choice.threshold_RSRP = 10;
-  ReportConfig_A5->reportConfig.choice.reportConfigEUTRA.triggerQuantity = LTE_ReportConfigEUTRA__triggerQuantity_rsrp;
-  ReportConfig_A5->reportConfig.choice.reportConfigEUTRA.reportQuantity = LTE_ReportConfigEUTRA__reportQuantity_both;
-  ReportConfig_A5->reportConfig.choice.reportConfigEUTRA.maxReportCells = 2;
-  ReportConfig_A5->reportConfig.choice.reportConfigEUTRA.reportInterval = LTE_ReportInterval_ms120;
-  ReportConfig_A5->reportConfig.choice.reportConfigEUTRA.reportAmount = LTE_ReportConfigEUTRA__reportAmount_infinity;
-  ASN_SEQUENCE_ADD(&ReportConfig_list->list, ReportConfig_A5);
-  Sparams = CALLOC(1, sizeof(*Sparams));
-  Sparams->present = LTE_MeasConfig__speedStatePars_PR_setup;
-  Sparams->choice.setup.timeToTrigger_SF.sf_High = LTE_SpeedStateScaleFactors__sf_Medium_oDot75;
-  Sparams->choice.setup.timeToTrigger_SF.sf_Medium = LTE_SpeedStateScaleFactors__sf_High_oDot5;
-  Sparams->choice.setup.mobilityStateParameters.n_CellChangeHigh = 10;
-  Sparams->choice.setup.mobilityStateParameters.n_CellChangeMedium = 5;
-  Sparams->choice.setup.mobilityStateParameters.t_Evaluation = LTE_MobilityStateParameters__t_Evaluation_s60;
-  Sparams->choice.setup.mobilityStateParameters.t_HystNormal = LTE_MobilityStateParameters__t_HystNormal_s120;
-  quantityConfig = CALLOC(1, sizeof(*quantityConfig));
-  memset((void *)quantityConfig, 0, sizeof(*quantityConfig));
-  quantityConfig->quantityConfigEUTRA = CALLOC(1, sizeof(*quantityConfig->quantityConfigEUTRA));
-  memset((void *)quantityConfig->quantityConfigEUTRA, 0, sizeof(*quantityConfig->quantityConfigEUTRA));
-  quantityConfig->quantityConfigCDMA2000 = NULL;
-  quantityConfig->quantityConfigGERAN = NULL;
-  quantityConfig->quantityConfigUTRA = NULL;
-  quantityConfig->quantityConfigEUTRA->filterCoefficientRSRP =
-    CALLOC(1, sizeof(*quantityConfig->quantityConfigEUTRA->filterCoefficientRSRP));
-  quantityConfig->quantityConfigEUTRA->filterCoefficientRSRQ =
-    CALLOC(1, sizeof(*quantityConfig->quantityConfigEUTRA->filterCoefficientRSRQ));
-  *quantityConfig->quantityConfigEUTRA->filterCoefficientRSRP = LTE_FilterCoefficient_fc4;
-  *quantityConfig->quantityConfigEUTRA->filterCoefficientRSRQ = LTE_FilterCoefficient_fc4;
-  /* mobilityinfo  */
-  mobilityInfo = CALLOC(1, sizeof(*mobilityInfo));
-  memset((void *)mobilityInfo, 0, sizeof(*mobilityInfo));
-  mobilityInfo->targetPhysCellId =
-    (LTE_PhysCellId_t) two_tier_hexagonal_cellIds[ue_context_pP->ue_context.handover_info->modid_t];
-  LOG_D(RRC, "[eNB %d] Frame %d: handover preparation: targetPhysCellId: %ld mod_id: %d ue: %x \n",
-        ctxt_pP->module_id,
-        ctxt_pP->frame,
-        mobilityInfo->targetPhysCellId,
-        ctxt_pP->module_id,
-        ue_context_pP->ue_context.rnti);
-  mobilityInfo->additionalSpectrumEmission = CALLOC(1, sizeof(*mobilityInfo->additionalSpectrumEmission));
-  *mobilityInfo->additionalSpectrumEmission = 1;  //Check this value!
-  mobilityInfo->t304 = LTE_MobilityControlInfo__t304_ms50;    // need to configure an appropriate value here
-  // New UE Identity (C-RNTI) to identify an UE uniquely in a cell
-  mobilityInfo->newUE_Identity.size = 2;
-  mobilityInfo->newUE_Identity.bits_unused = 0;
-  mobilityInfo->newUE_Identity.buf = rv;
-  mobilityInfo->newUE_Identity.buf[0] = rv[0];
-  mobilityInfo->newUE_Identity.buf[1] = rv[1];
-  //memset((void *)&mobilityInfo->radioResourceConfigCommon,(void *)&rrc_inst->sib2->radioResourceConfigCommon,sizeof(RadioResourceConfigCommon_t));
-  //memset((void *)&mobilityInfo->radioResourceConfigCommon,0,sizeof(RadioResourceConfigCommon_t));
-  // Configuring radioResourceConfigCommon
-  mobilityInfo->radioResourceConfigCommon.rach_ConfigCommon =
-    CALLOC(1, sizeof(*mobilityInfo->radioResourceConfigCommon.rach_ConfigCommon));
-  memcpy((void *)mobilityInfo->radioResourceConfigCommon.rach_ConfigCommon,
-         (void *)&rrc_inst->carrier[0] /* CROUX TBC */.sib2->radioResourceConfigCommon.rach_ConfigCommon, sizeof(LTE_RACH_ConfigCommon_t));
-  mobilityInfo->radioResourceConfigCommon.prach_Config.prach_ConfigInfo =
-    CALLOC(1, sizeof(*mobilityInfo->radioResourceConfigCommon.prach_Config.prach_ConfigInfo));
-  memcpy((void *)mobilityInfo->radioResourceConfigCommon.prach_Config.prach_ConfigInfo,
-         (void *)&rrc_inst->carrier[0] /* CROUX TBC */.sib2->radioResourceConfigCommon.prach_Config.prach_ConfigInfo,
-         sizeof(LTE_PRACH_ConfigInfo_t));
-  mobilityInfo->radioResourceConfigCommon.prach_Config.rootSequenceIndex =
-    rrc_inst->carrier[0] /* CROUX TBC */.sib2->radioResourceConfigCommon.prach_Config.rootSequenceIndex;
-  mobilityInfo->radioResourceConfigCommon.pdsch_ConfigCommon =
-    CALLOC(1, sizeof(*mobilityInfo->radioResourceConfigCommon.pdsch_ConfigCommon));
-  memcpy((void *)mobilityInfo->radioResourceConfigCommon.pdsch_ConfigCommon,
-         (void *)&rrc_inst->carrier[0] /* CROUX TBC */.sib2->radioResourceConfigCommon.pdsch_ConfigCommon, sizeof(LTE_PDSCH_ConfigCommon_t));
-  memcpy((void *)&mobilityInfo->radioResourceConfigCommon.pusch_ConfigCommon,
-         (void *)&rrc_inst->carrier[0] /* CROUX TBC */.sib2->radioResourceConfigCommon.pusch_ConfigCommon, sizeof(LTE_PUSCH_ConfigCommon_t));
-  mobilityInfo->radioResourceConfigCommon.phich_Config = NULL;
-  mobilityInfo->radioResourceConfigCommon.pucch_ConfigCommon =
-    CALLOC(1, sizeof(*mobilityInfo->radioResourceConfigCommon.pucch_ConfigCommon));
-  memcpy((void *)mobilityInfo->radioResourceConfigCommon.pucch_ConfigCommon,
-         (void *)&rrc_inst->carrier[0] /* CROUX TBC */.sib2->radioResourceConfigCommon.pucch_ConfigCommon, sizeof(LTE_PUCCH_ConfigCommon_t));
-  mobilityInfo->radioResourceConfigCommon.soundingRS_UL_ConfigCommon =
-    CALLOC(1, sizeof(*mobilityInfo->radioResourceConfigCommon.soundingRS_UL_ConfigCommon));
-  memcpy((void *)mobilityInfo->radioResourceConfigCommon.soundingRS_UL_ConfigCommon,
-         (void *)&rrc_inst->carrier[0] /* CROUX TBC */.sib2->radioResourceConfigCommon.soundingRS_UL_ConfigCommon,
-         sizeof(LTE_SoundingRS_UL_ConfigCommon_t));
-  mobilityInfo->radioResourceConfigCommon.uplinkPowerControlCommon =
-    CALLOC(1, sizeof(*mobilityInfo->radioResourceConfigCommon.uplinkPowerControlCommon));
-  memcpy((void *)mobilityInfo->radioResourceConfigCommon.uplinkPowerControlCommon,
-         (void *)&rrc_inst->carrier[0] /* CROUX TBC */.sib2->radioResourceConfigCommon.uplinkPowerControlCommon,
-         sizeof(LTE_UplinkPowerControlCommon_t));
-  mobilityInfo->radioResourceConfigCommon.antennaInfoCommon = NULL;
-  mobilityInfo->radioResourceConfigCommon.p_Max = NULL;   // CALLOC(1,sizeof(*mobilityInfo->radioResourceConfigCommon.p_Max));
-  //memcpy((void *)mobilityInfo->radioResourceConfigCommon.p_Max,(void *)rrc_inst->sib1->p_Max,sizeof(P_Max_t));
-  mobilityInfo->radioResourceConfigCommon.tdd_Config = NULL;  //CALLOC(1,sizeof(LTE_TDD_Config_t));
-  //memcpy((void *)mobilityInfo->radioResourceConfigCommon.tdd_Config,(void *)rrc_inst->sib1->tdd_Config,sizeof(LTE_TDD_Config_t));
-  mobilityInfo->radioResourceConfigCommon.ul_CyclicPrefixLength =
-    rrc_inst->carrier[0] /* CROUX TBC */.sib2->radioResourceConfigCommon.ul_CyclicPrefixLength;
-  //End of configuration of radioResourceConfigCommon
-  mobilityInfo->carrierFreq = CALLOC(1, sizeof(*mobilityInfo->carrierFreq));  //CALLOC(1,sizeof(CarrierFreqEUTRA_t)); 36090
-  mobilityInfo->carrierFreq->dl_CarrierFreq = 36090;
-  mobilityInfo->carrierFreq->ul_CarrierFreq = NULL;
-  mobilityInfo->carrierBandwidth = CALLOC(1, sizeof(
-      *mobilityInfo->carrierBandwidth));    //CALLOC(1,sizeof(struct LTE_CarrierBandwidthEUTRA));  LTE_AllowedMeasBandwidth_mbw25
-  mobilityInfo->carrierBandwidth->dl_Bandwidth = LTE_CarrierBandwidthEUTRA__dl_Bandwidth_n25;
-  mobilityInfo->carrierBandwidth->ul_Bandwidth = NULL;
-  mobilityInfo->rach_ConfigDedicated = NULL;
-  // store the srb and drb list for ho management, mainly in case of failure
-  memcpy(ue_context_pP->ue_context.handover_info->as_config.sourceRadioResourceConfig.srb_ToAddModList,
-         (void *)SRB_configList2,
-         sizeof(LTE_SRB_ToAddModList_t));
-  memcpy((void *)ue_context_pP->ue_context.handover_info->as_config.sourceRadioResourceConfig.drb_ToAddModList,
-         (void *)DRB_configList2,
-         sizeof(LTE_DRB_ToAddModList_t));
-  ue_context_pP->ue_context.handover_info->as_config.sourceRadioResourceConfig.drb_ToReleaseList = NULL;
-  memcpy((void *)ue_context_pP->ue_context.handover_info->as_config.sourceRadioResourceConfig.mac_MainConfig,
-         (void *)mac_MainConfig,
-         sizeof(LTE_MAC_MainConfig_t));
-  memcpy((void *)ue_context_pP->ue_context.handover_info->as_config.sourceRadioResourceConfig.physicalConfigDedicated,
-         (void *)ue_context_pP->ue_context.physicalConfigDedicated,
-         sizeof(LTE_PhysicalConfigDedicated_t));
-  /*    memcpy((void *)rrc_inst->handover_info[ue_mod_idP]->as_config.sourceRadioResourceConfig.sps_Config,
-     (void *)rrc_inst->sps_Config[ue_mod_idP],
-     sizeof(SPS_Config_t));
-   */
-  LOG_I(RRC, "[eNB %d] Frame %d: adding new UE\n",
-        ctxt_pP->module_id, ctxt_pP->frame);
-  //Idx = (ue_mod_idP * NB_RB_MAX) + DCCH;
-  Idx = DCCH;
-  // SRB1
-  ue_context_pP->ue_context.Srb1.Active = 1;
-  ue_context_pP->ue_context.Srb1.Srb_info.Srb_id = Idx;
-  memcpy(&ue_context_pP->ue_context.Srb1.Srb_info.Lchan_desc[0], &DCCH_LCHAN_DESC, LCHAN_DESC_SIZE);
-  memcpy(&ue_context_pP->ue_context.Srb1.Srb_info.Lchan_desc[1], &DCCH_LCHAN_DESC, LCHAN_DESC_SIZE);
-  // SRB2
-  ue_context_pP->ue_context.Srb2.Active = 1;
-  ue_context_pP->ue_context.Srb2.Srb_info.Srb_id = Idx;
-  memcpy(&ue_context_pP->ue_context.Srb2.Srb_info.Lchan_desc[0], &DCCH_LCHAN_DESC, LCHAN_DESC_SIZE);
-  memcpy(&ue_context_pP->ue_context.Srb2.Srb_info.Lchan_desc[1], &DCCH_LCHAN_DESC, LCHAN_DESC_SIZE);
-  LOG_I(RRC, "[eNB %d] CALLING RLC CONFIG SRB1 (rbid %d) for UE %x\n",
-        ctxt_pP->module_id, Idx, ue_context_pP->ue_context.rnti);
-  //      rrc_pdcp_config_req (enb_mod_idP, frameP, 1, CONFIG_ACTION_ADD, idx, UNDEF_SECURITY_MODE);
-  //      rrc_rlc_config_req(enb_mod_idP,frameP,1,CONFIG_ACTION_ADD,Idx,SIGNALLING_RADIO_BEARER,Rlc_info_am_config);
-  rrc_pdcp_config_asn1_req(&ctxt,
-                           ue_context_pP->ue_context.SRB_configList,
-                           (LTE_DRB_ToAddModList_t *) NULL, (LTE_DRB_ToReleaseList_t *) NULL, 0xff, NULL, NULL, NULL
-#if (LTE_RRC_VERSION >= MAKE_VERSION(9, 0, 0))
-                           , (LTE_PMCH_InfoList_r9_t *) NULL
-#endif
-                           ,NULL);
-  rrc_rlc_config_asn1_req(&ctxt,
-                          ue_context_pP->ue_context.SRB_configList,
-                          (LTE_DRB_ToAddModList_t *) NULL, (LTE_DRB_ToReleaseList_t *) NULL
-#if (LTE_RRC_VERSION >= MAKE_VERSION(9, 0, 0))
-                          , (LTE_PMCH_InfoList_r9_t *) NULL
-                          , 0, 0
-#endif
-                         );
-  /* Initialize NAS list */
-  dedicatedInfoNASList = NULL;
-  //  LTE_RRCConnectionReconfiguration->criticalExtensions.choice.c1.choice.rrcConnectionReconfiguration_r8.measConfig->reportConfigToAddModList = ReportConfig_list;
-  memset(buffer, 0, RRC_BUF_SIZE);
-  int size=do_RRCConnectionReconfiguration(
-             ctxt_pP,
-             buffer,
-             rrc_eNB_get_next_transaction_identifier(ctxt_pP->module_id),   //Transaction_id,
-             SRB_configList2,
-             DRB_configList2,
-             NULL,  // DRB2_list,
-             NULL,    //*sps_Config,
-             ue_context_pP->ue_context.physicalConfigDedicated,
-             MeasObj_list,
-             ReportConfig_list,
-             NULL,    //quantityConfig,
-             MeasId_list,
-             mac_MainConfig,
-             NULL,
-             mobilityInfo,
-             Sparams,
-             NULL,
-             NULL,
-             dedicatedInfoNASList,
-             (LTE_SL_CommConfig_r12_t *)NULL,
-             (LTE_SL_DiscConfig_r12_t *)NULL
-#if (LTE_RRC_VERSION >= MAKE_VERSION(10, 0, 0))
-             , NULL   // SCellToAddMod_r10_t
-#endif
-           );
-
-  if (size <= 0)
-    LOG_E(RRC,
-          "[eNB %d] Frame %d, Logical Channel DL-DCCH, Generate LTE_RRCConnectionReconfiguration for handover (bytes %d, UE rnti %x) failed\n",
-          ctxt_pP->module_id, ctxt_pP->frame, size, ue_context_pP->ue_context.rnti);
-  else
-    LOG_I(RRC,
-          "[eNB %d] Frame %d, Logical Channel DL-DCCH, Generate LTE_RRCConnectionReconfiguration for handover (bytes %d, UE rnti %x)\n",
-          ctxt_pP->module_id, ctxt_pP->frame, size, ue_context_pP->ue_context.rnti);
-
-  // to be updated if needed
-  /*if (RC.rrc[ctxt_pP->module_id]->SRB1_config[ue_mod_idP]->logicalChannelConfig) {
-     if (RC.rrc[ctxt_pP->module_id]->SRB1_config[ue_mod_idP]->logicalChannelConfig->present == LTE_SRB_ToAddMod__logicalChannelConfig_PR_explicitValue) {
-     SRB1_logicalChannelConfig = &RC.rrc[ctxt_pP->module_id]->SRB1_config[ue_mod_idP]->logicalChannelConfig->choice.explicitValue;
-     }
-     else {
-     SRB1_logicalChannelConfig = &SRB1_logicalChannelConfig_defaultValue;
-     }
-     }
-     else {
-     SRB1_logicalChannelConfig = &SRB1_logicalChannelConfig_defaultValue;
-     }
-   */
-  LOG_D(RRC,
-        "[FRAME %05d][RRC_eNB][MOD %02d][][--- PDCP_DATA_REQ/%d Bytes (rrcConnectionReconfiguration_handover to UE %x MUI %d) --->][PDCP][MOD %02d][RB %02d]\n",
-        ctxt_pP->frame, ctxt_pP->module_id, size, ue_context_pP->ue_context.rnti, rrc_eNB_mui, ctxt_pP->module_id, DCCH);
-  //rrc_rlc_data_req(ctxt_pP->module_id,frameP, 1,(ue_mod_idP*NB_RB_MAX)+DCCH,rrc_eNB_mui++,0,size,(char*)buffer);
-  //pdcp_data_req (ctxt_pP->module_id, frameP, 1, (ue_mod_idP * NB_RB_MAX) + DCCH,rrc_eNB_mui++, 0, size, (char *) buffer, 1);
-  rrc_mac_config_req_eNB(
-    ctxt_pP->module_id,
-    ue_context_pP->ue_context.primaryCC_id,
-    0,0,0,0,0,
-#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
-    0,
-#endif
-    ue_context_pP->ue_context.rnti,
-    (LTE_BCCH_BCH_Message_t *) NULL,
-    (LTE_RadioResourceConfigCommonSIB_t *) NULL,
-#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
-    (LTE_RadioResourceConfigCommonSIB_t *) NULL,
-#endif
-    ue_context_pP->ue_context.physicalConfigDedicated,
-#if (LTE_RRC_VERSION >= MAKE_VERSION(10, 0, 0))
-    (LTE_SCellToAddMod_r10_t *)NULL,
-    //(struct LTE_PhysicalConfigDedicatedSCell_r10 *)NULL,
-#endif
-    (LTE_MeasObjectToAddMod_t **) NULL,
-    ue_context_pP->ue_context.mac_MainConfig,
-    1,
-    SRB1_logicalChannelConfig,
-    ue_context_pP->ue_context.measGapConfig,
-    (LTE_TDD_Config_t *) NULL,
-    (LTE_MobilityControlInfo_t *) mobilityInfo,
-    (LTE_SecurityConfigHO_t *)NULL,
-    (LTE_SchedulingInfoList_t *) NULL, 0, NULL, NULL, (LTE_MBSFN_SubframeConfigList_t *) NULL
-#if (LTE_RRC_VERSION >= MAKE_VERSION(9, 0, 0))
-    , 0, (LTE_MBSFN_AreaInfoList_r9_t *) NULL, (LTE_PMCH_InfoList_r9_t *) NULL
-#endif
-#if (LTE_RRC_VERSION >= MAKE_VERSION(13, 0, 0))
-    ,
-    (LTE_SystemInformationBlockType1_v1310_IEs_t *)NULL
-#endif
-  );
-  /*
-     handoverCommand.criticalExtensions.present = HandoverCommand__criticalExtensions_PR_c1;
-     handoverCommand.criticalExtensions.choice.c1.present = HandoverCommand__criticalExtensions__c1_PR_handoverCommand_r8;
-     handoverCommand.criticalExtensions.choice.c1.choice.handoverCommand_r8.handoverCommandMessage.buf = buffer;
-     handoverCommand.criticalExtensions.choice.c1.choice.handoverCommand_r8.handoverCommandMessage.size = size;
-   */
-  //#warning "COMPILATION PROBLEM"
-#ifdef PROBLEM_COMPILATION_RESOLVED
-
-  if (sourceModId != 0xFF) {
-    memcpy(RC.rrc[sourceModId].handover_info[RC.rrc[ctxt_pP->module_id]->handover_info[ue_mod_idP]->ueid_s]->buf,
-           (void *)buffer, size);
-    RC.rrc[sourceModId].handover_info[RC.rrc[ctxt_pP->module_id]->handover_info[ue_mod_idP]->ueid_s]->size = size;
-    RC.rrc[sourceModId].handover_info[RC.rrc[ctxt_pP->module_id]->handover_info[ue_mod_idP]->ueid_s]->ho_complete =
-      0xF1;
-    //RC.rrc[ctxt_pP->module_id]->handover_info[ue_mod_idP]->ho_complete = 0xFF;
-    LOG_D(RRC, "[eNB %d] Frame %d: setting handover complete to 0xF1 for (%d,%d) and to 0xFF for (%d,%d)\n",
-          ctxt_pP->module_id,
-          ctxt_pP->frame,
-          sourceModId,
-          RC.rrc[ctxt_pP->module_id]->handover_info[ue_mod_idP]->ueid_s,
-          ctxt_pP->module_id,
-          ue_mod_idP);
-  } else
-    LOG_W(RRC,
-          "[eNB %d] Frame %d: rrc_eNB_generate_RRCConnectionReconfiguration_handover: Could not find source eNB mod_id.\n",
-          ctxt_pP->module_id, ctxt_pP->frame);
-
-#endif
-}
-#endif
-
-
-//-----------------------------------------------------------------------------
-/*
-* TODO: * add function description
-*       * format the function correctly
-*/
-void
-rrc_eNB_process_RRCConnectionReconfigurationComplete(
-  const protocol_ctxt_t *const ctxt_pP,
-  rrc_eNB_ue_context_t        *ue_context_pP,
-  const uint8_t xid
-)
-//-----------------------------------------------------------------------------
-{
-  int                                 i, drb_id;
-  int                                 oip_ifup = 0;
-  int                                 dest_ip_offset = 0;
-  uint8_t                            *kRRCenc = NULL;
-  uint8_t                            *kRRCint = NULL;
-  uint8_t                            *kUPenc = NULL;
-  ue_context_pP->ue_context.ue_reestablishment_timer = 0;
-  LTE_DRB_ToAddModList_t                 *DRB_configList = ue_context_pP->ue_context.DRB_configList2[xid];
-  LTE_SRB_ToAddModList_t                 *SRB_configList = ue_context_pP->ue_context.SRB_configList2[xid];
-  LTE_DRB_ToReleaseList_t                *DRB_Release_configList2 = ue_context_pP->ue_context.DRB_Release_configList2[xid];
-  LTE_DRB_Identity_t                     *drb_id_p      = NULL;
-  T(T_ENB_RRC_CONNECTION_RECONFIGURATION_COMPLETE, T_INT(ctxt_pP->module_id), T_INT(ctxt_pP->frame),
-    T_INT(ctxt_pP->subframe), T_INT(ctxt_pP->rnti));
-
-  /* Derive the keys from kenb */
-  if (DRB_configList != NULL) {
-    derive_key_up_enc(ue_context_pP->ue_context.ciphering_algorithm,
-                      ue_context_pP->ue_context.kenb, &kUPenc);
-  }
-
-  derive_key_rrc_enc(ue_context_pP->ue_context.ciphering_algorithm,
-                     ue_context_pP->ue_context.kenb, &kRRCenc);
-  derive_key_rrc_int(ue_context_pP->ue_context.integrity_algorithm,
-                     ue_context_pP->ue_context.kenb, &kRRCint);
-  // Refresh SRBs/DRBs
-  MSC_LOG_TX_MESSAGE(
-    MSC_RRC_ENB,
-    MSC_PDCP_ENB,
-    NULL,
-    0,
-    MSC_AS_TIME_FMT" CONFIG_REQ UE %x DRB (security unchanged)",
-    MSC_AS_TIME_ARGS(ctxt_pP),
-    ue_context_pP->ue_context.rnti);
-  rrc_pdcp_config_asn1_req(
-    ctxt_pP,
-    SRB_configList, //NULL,  //LG-RK 14/05/2014 SRB_configList,
-    DRB_configList,
-    //    (LTE_DRB_ToReleaseList_t *) NULL,
-    DRB_Release_configList2,
-    /*RC.rrc[ctxt_pP->module_id]->ciphering_algorithm[ue_mod_idP] |
-             (RC.rrc[ctxt_pP->module_id]->integrity_algorithm[ue_mod_idP] << 4),
-     */
-    0xff, // already configured during the securitymodecommand
-    kRRCenc,
-    kRRCint,
-    kUPenc
-#if (LTE_RRC_VERSION >= MAKE_VERSION(9, 0, 0))
-    , (LTE_PMCH_InfoList_r9_t *) NULL
-#endif
-    ,NULL);
-  // Refresh SRBs/DRBs
-  rrc_rlc_config_asn1_req(
-    ctxt_pP,
-    SRB_configList, // NULL,  //LG-RK 14/05/2014 SRB_configList,
-    DRB_configList,
-    //    (LTE_DRB_ToReleaseList_t *) NULL
-    DRB_Release_configList2
-#if (LTE_RRC_VERSION >= MAKE_VERSION(9, 0, 0))
-    , (LTE_PMCH_InfoList_r9_t *) NULL
-    , 0, 0
-#endif
-  );
-
-  // set the SRB active in Ue context
-  if (SRB_configList != NULL) {
-    for (i = 0; (i < SRB_configList->list.count) && (i < 3); i++) {
-      if (SRB_configList->list.array[i]->srb_Identity == 1 ) {
-        ue_context_pP->ue_context.Srb1.Active=1;
-      } else if (SRB_configList->list.array[i]->srb_Identity == 2 )  {
-        ue_context_pP->ue_context.Srb2.Active=1;
-        ue_context_pP->ue_context.Srb2.Srb_info.Srb_id=2;
-        LOG_I(RRC,"[eNB %d] Frame  %d CC %d : SRB2 is now active\n",
-              ctxt_pP->module_id,
-              ctxt_pP->frame,
-              ue_context_pP->ue_context.primaryCC_id);
-      } else {
-        LOG_W(RRC,"[eNB %d] Frame  %d CC %d : invalide SRB identity %ld\n",
-              ctxt_pP->module_id,
-              ctxt_pP->frame,
-              ue_context_pP->ue_context.primaryCC_id,
-              SRB_configList->list.array[i]->srb_Identity);
+        LOG_W(RRC,"[eNB %d] Frame  %d CC %d : invalide SRB identity %ld\n",
+              ctxt_pP->module_id,
+              ctxt_pP->frame,
+              ue_context_pP->ue_context.primaryCC_id,
+              SRB_configList->list.array[i]->srb_Identity);
       }
     }
 
@@ -7579,13 +6818,9 @@ rrc_eNB_decode_dcch(
         }
 
         if (EPC_MODE_ENABLED) {
-          if (EPC_MODE_ENABLED == 1) {
-#if defined(ENABLE_USE_MME)
           rrc_eNB_send_S1AP_UE_CAPABILITIES_IND(ctxt_pP,
                                                 ue_context_p,
                                                 ul_dcch_msg);
-#endif
-          }
         } else {
           ue_context_p->ue_context.nb_of_e_rabs = 1;
 
@@ -7632,11 +6867,9 @@ rrc_eNB_decode_dcch(
           sdu_sizeP);
 
         if (EPC_MODE_ENABLED == 1) {
-#if defined(ENABLE_USE_MME)
           rrc_eNB_send_S1AP_UPLINK_NAS(ctxt_pP,
                                        ue_context_p,
                                        ul_dcch_msg);
-#endif
         }
 
         break;
@@ -7784,8 +7017,18 @@ void rrc_subframe_process(protocol_ctxt_t *const ctxt_pP, const int CC_id)
   double estimated_distance = 0;
   protocol_ctxt_t ctxt;
 #endif
+  MessageDef *msg;
+
   VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_RRC_RX_TX, VCD_FUNCTION_IN);
+
+  if (is_x2ap_enabled()) {
+    /* send a tick to x2ap */
+    msg = itti_alloc_new_message(TASK_RRC_ENB, X2AP_SUBFRAME_PROCESS);
+    itti_send_msg_to_task(TASK_X2AP, ctxt_pP->module_id, msg);
+
     check_handovers(ctxt_pP); // counter, get the value and aggregate
+  }
+
   // check for UL failure or for UE to be released
   RB_FOREACH(ue_context_p, rrc_ue_tree_s, &(RC.rrc[ctxt_pP->module_id]->rrc_ue_head)) {
     ctxt_pP->rnti = ue_context_p->ue_id_rnti;
@@ -7845,15 +7088,21 @@ void rrc_subframe_process(protocol_ctxt_t *const ctxt_pP, const int CC_id)
       }
     }
 
-#if defined(ENABLE_USE_MME)
     if (ue_context_p->ue_context.handover_info != NULL) {
       if (ue_context_p->ue_context.handover_info->state == HO_RELEASE) {
         ue_to_be_removed = ue_context_p;
         rrc_eNB_handover_ue_context_release(ctxt_pP, ue_context_p);
         break; //break RB_FOREACH (why to break ?)
       }
+      if (ue_context_p->ue_context.handover_info->state == HO_CANCEL) {
+        rrc_eNB_handover_cancel(ctxt_pP, ue_context_p);
+        /* freeing handover_info and setting it to NULL to let
+         * RRC wait for MME to later on release the UE
+         */
+        free(ue_context_p->ue_context.handover_info);
+        ue_context_p->ue_context.handover_info = NULL;
+      }
     }
-#endif
 
     pthread_mutex_lock(&rrc_release_freelist);
 
@@ -8145,7 +7394,9 @@ void *rrc_enb_process_itti_msg(void *notUsed) {
 
       if (ue != NULL
           && ue->ue_context.ue_release_timer_rrc > 0
-          && (ue->ue_context.handover_info == NULL || ue->ue_context.handover_info->state != HO_RELEASE)) {
+          && (ue->ue_context.handover_info == NULL ||
+              (ue->ue_context.handover_info->state != HO_RELEASE &&
+               ue->ue_context.handover_info->state != HO_CANCEL))) {
         ue->ue_context.ue_release_timer_rrc = ue->ue_context.ue_release_timer_thres_rrc;
       }
 
@@ -8193,6 +7444,51 @@ void *rrc_enb_process_itti_msg(void *notUsed) {
       break;
     }
 
+   case X2AP_HANDOVER_CANCEL: {
+      struct rrc_eNB_ue_context_s        *ue_context_p = NULL;
+      char *cause;
+      switch (X2AP_HANDOVER_CANCEL(msg_p).cause) {
+      case X2AP_T_RELOC_PREP_TIMEOUT:
+        cause = "T_RelocPrep timeout";
+        break;
+      case X2AP_TX2_RELOC_OVERALL_TIMEOUT:
+        cause = "Tx2_RelocOverall timeout";
+        break;
+      default:
+        /* cannot come here */
+        exit(1);
+      }
+      ue_context_p = rrc_eNB_get_ue_context(RC.rrc[instance], X2AP_HANDOVER_CANCEL(msg_p).rnti);
+      if (ue_context_p != NULL &&
+          ue_context_p->ue_context.handover_info != NULL) {
+        LOG_I(RRC, "[eNB %d] eNB receives X2 HANDOVER CANCEL for rnti %x, cause %s [%s]\n",
+              instance,
+              X2AP_HANDOVER_CANCEL(msg_p).rnti,
+              cause,
+              msg_name_p);
+        if (X2AP_HANDOVER_CANCEL(msg_p).cause == X2AP_T_RELOC_PREP_TIMEOUT) {
+          /* for prep timeout, simply return to normal state */
+          /* TODO: be sure that it's correct to set Status to RRC_RECONFIGURED */
+          ue_context_p->ue_context.Status = RRC_RECONFIGURED;
+          /* TODO: be sure free is enough here (check memory leaks) */
+          free(ue_context_p->ue_context.handover_info);
+          ue_context_p->ue_context.handover_info = NULL;
+        } else {
+          /* for overall timeout, remove UE entirely */
+          ue_context_p->ue_context.handover_info->state = HO_CANCEL;
+        }
+      } else {
+        char *failure_cause;
+        if (ue_context_p == NULL)
+          failure_cause = "no UE found";
+        else
+          failure_cause = "UE not in handover";
+        LOG_W(RRC, "[eNB %d] cannot process (%s) X2 HANDOVER CANCEL for rnti %x, cause %s, ignoring\n",
+              instance, failure_cause, X2AP_HANDOVER_CANCEL(msg_p).rnti, cause);
+      }
+      break;
+    }
+
     /* Messages from eNB app */
     case RRC_CONFIGURATION_REQ:
       LOG_I(RRC, "[eNB %d] Received %s : %p\n", instance, msg_name_p,&RRC_CONFIGURATION_REQ(msg_p));

openair2/X2AP/x2ap_eNB.c

@@ -41,6 +41,7 @@
 #include "x2ap_eNB_generate_messages.h"
 #include "x2ap_common.h"
 #include "x2ap_ids.h"
+#include "x2ap_timers.h"
 
 #include "queue.h"
 #include "assertions.h"
@@ -301,6 +302,9 @@ void x2ap_eNB_handle_register_eNB(instance_t instance,
     new_instance->num_cc           = x2ap_register_eNB->num_cc;
 
     x2ap_id_manager_init(&new_instance->id_manager);
+    x2ap_timers_init(&new_instance->timers,
+                     x2ap_register_eNB->t_reloc_prep,
+                     x2ap_register_eNB->tx2_reloc_overall);
 
     for (int i = 0; i< x2ap_register_eNB->num_cc; i++) {
       new_instance->eutra_band[i]              = x2ap_register_eNB->eutra_band[i];
@@ -402,6 +406,10 @@ void x2ap_eNB_handle_handover_req(instance_t instance,
   }
   /* id_source is ue_id, id_target is unknown yet */
   x2ap_set_ids(id_manager, ue_id, x2ap_handover_req->rnti, ue_id, -1);
+  x2ap_id_set_state(id_manager, ue_id, X2ID_STATE_SOURCE_PREPARE);
+  x2ap_set_reloc_prep_timer(id_manager, ue_id,
+                            x2ap_timer_get_tti(&instance_p->timers));
+  x2ap_id_set_target(id_manager, ue_id, target);
 
   x2ap_eNB_generate_x2_handover_request(instance_p, target, x2ap_handover_req, ue_id);
 }
@@ -480,6 +488,10 @@ void *x2ap_task(void *arg) {
         itti_exit_task();
         break;
 
+      case X2AP_SUBFRAME_PROCESS:
+        x2ap_check_timers(ITTI_MESSAGE_GET_INSTANCE(received_msg));
+        break;
+
       case X2AP_REGISTER_ENB_REQ:
         x2ap_eNB_handle_register_eNB(ITTI_MESSAGE_GET_INSTANCE(received_msg),
                                      &X2AP_REGISTER_ENB_REQ(received_msg));
@@ -534,4 +546,38 @@ void *x2ap_task(void *arg) {
   return NULL;
 }
 
+#include "common/config/config_userapi.h"
+
+int is_x2ap_enabled(void)
+{
+  static volatile int config_loaded = 0;
+  static volatile int enabled = 0;
+  static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+
+  if (pthread_mutex_lock(&mutex)) goto mutex_error;
+
+  if (config_loaded) {
+    if (pthread_mutex_unlock(&mutex)) goto mutex_error;
+    return enabled;
+  }
+
+  char *enable_x2 = NULL;
+  paramdef_t p[] = {
+   { "enable_x2", "yes/no", 0, strptr:&enable_x2, defstrval:"", TYPE_STRING, 0 }
+  };
+
+  /* TODO: do it per module - we check only first eNB */
+  config_get(p, sizeof(p)/sizeof(paramdef_t), "eNBs.[0]");
+  if (enable_x2 != NULL && strcmp(enable_x2, "yes") == 0)
+    enabled = 1;
+
+  config_loaded = 1;
+
+  if (pthread_mutex_unlock(&mutex)) goto mutex_error;
 
+  return enabled;
+
+mutex_error:
+  LOG_E(X2AP, "mutex error\n");
+  exit(1);
+}

openair2/X2AP/x2ap_eNB.h

@@ -46,6 +46,8 @@ int x2ap_eNB_init_sctp (x2ap_eNB_instance_t *instance_p,
 
 void *x2ap_task(void *arg);
 
+int is_x2ap_enabled(void);
+
 #endif /* X2AP_H_ */
 
 /**

openair2/X2AP/x2ap_eNB_decoder.c

@@ -48,11 +48,17 @@ static int x2ap_eNB_decode_initiating_message(X2AP_X2AP_PDU_t *pdu)
       //asn_encode_to_new_buffer(NULL, ATS_CANONICAL_XER, &asn_DEF_X2AP_X2AP_PDU, pdu);
       X2AP_INFO("x2ap_eNB_decode_initiating_message!\n");
       break;
+
     case X2AP_ProcedureCode_id_uEContextRelease:
       //asn_encode_to_new_buffer(NULL, ATS_CANONICAL_XER, &asn_DEF_X2AP_X2AP_PDU, pdu);
       X2AP_INFO("x2ap_eNB_decode_initiating_message!\n");
       break;
 
+    case X2AP_ProcedureCode_id_handoverCancel:
+      //asn_encode_to_new_buffer(NULL, ATS_CANONICAL_XER, &asn_DEF_X2AP_X2AP_PDU, pdu);
+      X2AP_INFO("x2ap_eNB_decode_initiating_message!\n");
+      break;
+
     default:
       X2AP_ERROR("Unknown procedure ID (%d) for initiating message\n",
                   (int)pdu->choice.initiatingMessage.procedureCode);

openair2/X2AP/x2ap_eNB_defs.h

@@ -34,6 +34,7 @@
 #include "sctp_eNB_defs.h"
 
 #include "x2ap_ids.h"
+#include "x2ap_timers.h"
 
 #ifndef X2AP_ENB_DEFS_H_
 #define X2AP_ENB_DEFS_H_
@@ -63,7 +64,6 @@ typedef enum {
   X2AP_ENB_STATE_MAX,
 } x2ap_eNB_state_t;
 
-
 /* Served PLMN identity element */
 struct plmn_identity_s {
   uint16_t mcc;
@@ -184,6 +184,7 @@ typedef struct x2ap_eNB_instance_s {
   int              multi_sd;
 
   x2ap_id_manager  id_manager;
+  x2ap_timers_t    timers;
 } x2ap_eNB_instance_t;
 
 typedef struct {

openair2/X2AP/x2ap_eNB_generate_messages.c

@@ -718,3 +718,87 @@ int x2ap_eNB_generate_x2_ue_context_release (x2ap_eNB_instance_t *instance_p, x2
 
   return ret;
 }
+
+int x2ap_eNB_generate_x2_handover_cancel (x2ap_eNB_instance_t *instance_p, x2ap_eNB_data_t *x2ap_eNB_data_p,
+                                          int x2_ue_id,
+                                          x2ap_handover_cancel_cause_t cause)
+{
+  X2AP_X2AP_PDU_t              pdu;
+  X2AP_HandoverCancel_t        *out;
+  X2AP_HandoverCancel_IEs_t    *ie;
+  int                          ue_id;
+  int                          id_source;
+  int                          id_target;
+
+  uint8_t  *buffer;
+  uint32_t  len;
+  int       ret = 0;
+
+  DevAssert(instance_p != NULL);
+  DevAssert(x2ap_eNB_data_p != NULL);
+
+  ue_id = x2_ue_id;
+  id_source = ue_id;
+  id_target = x2ap_id_get_id_target(&instance_p->id_manager, ue_id);
+
+  /* Prepare the X2AP handover cancel message to encode */
+  memset(&pdu, 0, sizeof(pdu));
+  pdu.present = X2AP_X2AP_PDU_PR_initiatingMessage;
+  pdu.choice.initiatingMessage.procedureCode = X2AP_ProcedureCode_id_handoverCancel;
+  pdu.choice.initiatingMessage.criticality = X2AP_Criticality_ignore;
+  pdu.choice.initiatingMessage.value.present = X2AP_InitiatingMessage__value_PR_HandoverCancel;
+  out = &pdu.choice.initiatingMessage.value.choice.HandoverCancel;
+
+  /* mandatory */
+  ie = (X2AP_HandoverCancel_IEs_t *)calloc(1, sizeof(X2AP_HandoverCancel_IEs_t));
+  ie->id = X2AP_ProtocolIE_ID_id_Old_eNB_UE_X2AP_ID;
+  ie->criticality = X2AP_Criticality_reject;
+  ie->value.present = X2AP_HandoverCancel_IEs__value_PR_UE_X2AP_ID;
+  ie->value.choice.UE_X2AP_ID = id_source;
+  ASN_SEQUENCE_ADD(&out->protocolIEs.list, ie);
+
+  /* optional */
+  if (id_target != -1) {
+    ie = (X2AP_HandoverCancel_IEs_t *)calloc(1, sizeof(X2AP_HandoverCancel_IEs_t));
+    ie->id = X2AP_ProtocolIE_ID_id_New_eNB_UE_X2AP_ID;
+    ie->criticality = X2AP_Criticality_ignore;
+    ie->value.present = X2AP_HandoverCancel_IEs__value_PR_UE_X2AP_ID_1;
+    ie->value.choice.UE_X2AP_ID_1 = id_target;
+    ASN_SEQUENCE_ADD(&out->protocolIEs.list, ie);
+  }
+
+  /* mandatory */
+  ie = (X2AP_HandoverCancel_IEs_t *)calloc(1, sizeof(X2AP_HandoverCancel_IEs_t));
+  ie->id = X2AP_ProtocolIE_ID_id_Cause;
+  ie->criticality = X2AP_Criticality_ignore;
+  ie->value.present = X2AP_HandoverCancel_IEs__value_PR_Cause;
+  switch (cause) {
+  case X2AP_T_RELOC_PREP_TIMEOUT:
+    ie->value.choice.Cause.present = X2AP_Cause_PR_radioNetwork;
+    ie->value.choice.Cause.choice.radioNetwork =
+      X2AP_CauseRadioNetwork_trelocprep_expiry;
+    break;
+  case X2AP_TX2_RELOC_OVERALL_TIMEOUT:
+    ie->value.choice.Cause.present = X2AP_Cause_PR_radioNetwork;
+    ie->value.choice.Cause.choice.radioNetwork =
+      X2AP_CauseRadioNetwork_tx2relocoverall_expiry;
+    break;
+  default:
+    /* we can't come here */
+    X2AP_ERROR("unhandled cancel cause\n");
+    exit(1);
+  }
+  ASN_SEQUENCE_ADD(&out->protocolIEs.list, ie);
+
+  if (x2ap_eNB_encode_pdu(&pdu, &buffer, &len) < 0) {
+    X2AP_ERROR("Failed to encode X2 Handover Cancel\n");
+    abort();
+    return -1;
+  }
+
+  MSC_LOG_TX_MESSAGE (MSC_X2AP_SRC_ENB, MSC_X2AP_TARGET_ENB, NULL, 0, "0 X2HandoverCancel/initiatingMessage assoc_id %u", x2ap_eNB_data_p->assoc_id);
+
+  x2ap_eNB_itti_send_sctp_data_req(instance_p->instance, x2ap_eNB_data_p->assoc_id, buffer, len, 1);
+
+  return ret;
+}

openair2/X2AP/x2ap_eNB_generate_messages.h

@@ -55,5 +55,10 @@ int x2ap_eNB_generate_x2_handover_request_ack (x2ap_eNB_instance_t *instance_p,
 
 int x2ap_eNB_generate_x2_ue_context_release (x2ap_eNB_instance_t *instance_p, x2ap_eNB_data_t *x2ap_eNB_data_p,
                                              x2ap_ue_context_release_t *x2ap_ue_context_release);
+
+int x2ap_eNB_generate_x2_handover_cancel (x2ap_eNB_instance_t *instance_p, x2ap_eNB_data_t *x2ap_eNB_data_p,
+                                          int x2_ue_id,
+                                          x2ap_handover_cancel_cause_t cause);
+
 #endif /*  X2AP_ENB_GENERATE_MESSAGES_H_ */
 

openair2/X2AP/x2ap_eNB_handler.c

@@ -78,10 +78,16 @@ int x2ap_eNB_handle_ue_context_release (instance_t instance,
                                         uint32_t stream,
                                         X2AP_X2AP_PDU_t *pdu);
 
+static
+int x2ap_eNB_handle_handover_cancel (instance_t instance,
+                                     uint32_t assoc_id,
+                                     uint32_t stream,
+                                     X2AP_X2AP_PDU_t *pdu);
+
 /* Handlers matrix. Only eNB related procedure present here */
 x2ap_message_decoded_callback x2ap_messages_callback[][3] = {
   { x2ap_eNB_handle_handover_preparation, x2ap_eNB_handle_handover_response, 0 }, /* handoverPreparation */
-  { 0, 0, 0 }, /* handoverCancel */
+  { x2ap_eNB_handle_handover_cancel, 0, 0 }, /* handoverCancel */
   { 0, 0, 0 }, /* loadIndication */
   { 0, 0, 0 }, /* errorIndication */
   { 0, 0, 0 }, /* snStatusTransfer */
@@ -631,6 +637,7 @@ int x2ap_eNB_handle_handover_preparation (instance_t instance,
   }
   /* rnti is unknown yet, must not be set to -1, 0 is fine */
   x2ap_set_ids(&instance_p->id_manager, ue_id, 0, ie->value.choice.UE_X2AP_ID, ue_id);
+  x2ap_id_set_state(&instance_p->id_manager, ue_id, X2ID_STATE_TARGET);
 
   X2AP_HANDOVER_REQ(msg).x2_id = ue_id;
 
@@ -775,15 +782,19 @@ int x2ap_eNB_handle_handover_response (instance_t instance,
 
   ue_id = id_source;
 
-  if (id_source != x2ap_id_get_id_source(&instance_p->id_manager, ue_id)) {
-    X2AP_ERROR("incorrect X2AP IDs for UE (old ID %d new ID %d)\n", id_source, id_target);
-    exit(1);
+  if (ue_id != x2ap_find_id_from_id_source(&instance_p->id_manager, id_source)) {
+    X2AP_WARN("incorrect/unknown X2AP IDs for UE (old ID %d new ID %d), ignoring handover response\n",
+              id_source, id_target);
+    return 0;
   }
 
   rnti = x2ap_id_get_rnti(&instance_p->id_manager, ue_id);
 
   /* id_target is a new information, store it */
   x2ap_set_ids(&instance_p->id_manager, ue_id, rnti, id_source, id_target);
+  x2ap_id_set_state(&instance_p->id_manager, ue_id, X2ID_STATE_SOURCE_OVERALL);
+  x2ap_set_reloc_overall_timer(&instance_p->id_manager, ue_id,
+                               x2ap_timer_get_tti(&instance_p->timers));
 
   X2AP_HANDOVER_REQ_ACK(msg).rnti = rnti;
 
@@ -859,13 +870,19 @@ int x2ap_eNB_handle_ue_context_release (instance_t instance,
   id_target = ie->value.choice.UE_X2AP_ID_1;
 
   ue_id = id_source;
+  if (ue_id != x2ap_find_id_from_id_source(&instance_p->id_manager, id_source)) {
+    X2AP_WARN("incorrect/unknown X2AP IDs for UE (old ID %d new ID %d), ignoring UE context release\n",
+              id_source, id_target);
+    return 0;
+  }
 
   if (id_target != x2ap_id_get_id_target(&instance_p->id_manager, ue_id)) {
-    X2AP_ERROR("UE context release: bad id_target for UE %x (id_source %d) expected %d got %d\n",
+    X2AP_ERROR("UE context release: bad id_target for UE %x (id_source %d) expected %d got %d, ignoring message\n",
                x2ap_id_get_rnti(&instance_p->id_manager, ue_id),
                id_source,
                x2ap_id_get_id_target(&instance_p->id_manager, ue_id),
                id_target);
+    return 0;
   }
 
   X2AP_UE_CONTEXT_RELEASE(msg).rnti = x2ap_id_get_rnti(&instance_p->id_manager, ue_id);
@@ -876,3 +893,111 @@ int x2ap_eNB_handle_ue_context_release (instance_t instance,
 
   return 0;
 }
+
+static
+int x2ap_eNB_handle_handover_cancel (instance_t instance,
+                                     uint32_t assoc_id,
+                                     uint32_t stream,
+                                     X2AP_X2AP_PDU_t *pdu)
+{
+  X2AP_HandoverCancel_t             *x2HandoverCancel;
+  X2AP_HandoverCancel_IEs_t         *ie;
+
+  x2ap_eNB_instance_t               *instance_p;
+  x2ap_eNB_data_t                   *x2ap_eNB_data;
+  MessageDef                        *msg;
+  int                               ue_id;
+  int                               id_source;
+  int                               id_target;
+  x2ap_handover_cancel_cause_t      cause;
+
+  DevAssert (pdu != NULL);
+  x2HandoverCancel = &pdu->choice.initiatingMessage.value.choice.HandoverCancel;
+
+  if (stream == 0) {
+    X2AP_ERROR ("Received new x2 handover cancel on stream == 0\n");
+    return 0;
+  }
+
+  X2AP_DEBUG ("Received a new X2 handover cancel\n");
+
+  x2ap_eNB_data = x2ap_get_eNB(NULL, assoc_id, 0);
+  DevAssert(x2ap_eNB_data != NULL);
+
+  instance_p = x2ap_eNB_get_instance(instance);
+  DevAssert(instance_p != NULL);
+
+  X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_HandoverCancel_IEs_t, ie, x2HandoverCancel,
+                             X2AP_ProtocolIE_ID_id_Old_eNB_UE_X2AP_ID, true);
+
+  if (ie == NULL ) {
+    X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__);
+    return -1;
+  }
+
+  id_source = ie->value.choice.UE_X2AP_ID;
+
+  X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_HandoverCancel_IEs_t, ie, x2HandoverCancel,
+                             X2AP_ProtocolIE_ID_id_New_eNB_UE_X2AP_ID, false);
+
+  if (ie == NULL ) {
+    X2AP_INFO("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__);
+    id_target = -1;
+  } else
+    id_target = ie->value.choice.UE_X2AP_ID_1;
+
+  X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_HandoverCancel_IEs_t, ie, x2HandoverCancel,
+                             X2AP_ProtocolIE_ID_id_Cause, true);
+
+  if (ie == NULL ) {
+    X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__);
+    return -1;
+  }
+
+  if (ie->value.present != X2AP_HandoverCancel_IEs__value_PR_Cause ||
+      ie->value.choice.Cause.present != X2AP_Cause_PR_radioNetwork ||
+      !(ie->value.choice.Cause.choice.radioNetwork ==
+            X2AP_CauseRadioNetwork_trelocprep_expiry ||
+        ie->value.choice.Cause.choice.radioNetwork ==
+            X2AP_CauseRadioNetwork_tx2relocoverall_expiry)) {
+    X2AP_ERROR("%s %d: Cause not supported (only T_reloc_prep and TX2_reloc_overall handled)\n",__FILE__,__LINE__);
+    return -1;
+  }
+
+  switch (ie->value.choice.Cause.choice.radioNetwork) {
+  case X2AP_CauseRadioNetwork_trelocprep_expiry:
+    cause = X2AP_T_RELOC_PREP_TIMEOUT;
+    break;
+  case X2AP_CauseRadioNetwork_tx2relocoverall_expiry:
+    cause = X2AP_TX2_RELOC_OVERALL_TIMEOUT;
+    break;
+  default: /* can't come here */ exit(1);
+  }
+
+  ue_id = x2ap_find_id_from_id_source(&instance_p->id_manager, id_source);
+  if (ue_id == -1) {
+    X2AP_WARN("Handover cancel: UE not found (id_source = %d), ignoring message\n", id_source);
+    return 0;
+  }
+
+  if (id_target != -1 &&
+      id_target != x2ap_id_get_id_target(&instance_p->id_manager, ue_id)) {
+    X2AP_ERROR("Handover cancel: bad id_target for UE %x (id_source %d) expected %d got %d\n",
+               x2ap_id_get_rnti(&instance_p->id_manager, ue_id),
+               id_source,
+               x2ap_id_get_id_target(&instance_p->id_manager, ue_id),
+               id_target);
+    exit(1);
+  }
+
+  msg = itti_alloc_new_message(TASK_X2AP, X2AP_HANDOVER_CANCEL);
+
+  X2AP_HANDOVER_CANCEL(msg).rnti = x2ap_id_get_rnti(&instance_p->id_manager, ue_id);
+  X2AP_HANDOVER_CANCEL(msg).cause = cause;
+
+  itti_send_msg_to_task(TASK_RRC_ENB, instance_p->instance, msg);
+
+  x2ap_release_id(&instance_p->id_manager, ue_id);
+
+  return 0;
+}

openair2/X2AP/x2ap_ids.c

@@ -60,6 +60,16 @@ int x2ap_find_id(x2ap_id_manager *m, int id_source, int id_target)
   return -1;
 }
 
+int x2ap_find_id_from_id_source(x2ap_id_manager *m, int id_source)
+{
+  int i;
+  for (i = 0; i < X2AP_MAX_IDS; i++)
+    if (m->ids[i].rnti != -1 &&
+        m->ids[i].id_source == id_source)
+      return i;
+  return -1;
+}
+
 int x2ap_find_id_from_rnti(x2ap_id_manager *m, int rnti)
 {
   int i;
@@ -76,6 +86,27 @@ void x2ap_set_ids(x2ap_id_manager *m, int ue_id, int rnti, int id_source, int id
   m->ids[ue_id].id_target = id_target;
 }
 
+/* real type of target is x2ap_eNB_data_t * */
+void x2ap_id_set_target(x2ap_id_manager *m, int ue_id, void *target)
+{
+  m->ids[ue_id].target = target;
+}
+
+void x2ap_id_set_state(x2ap_id_manager *m, int ue_id, x2id_state_t state)
+{
+  m->ids[ue_id].state = state;
+}
+
+void x2ap_set_reloc_prep_timer(x2ap_id_manager *m, int ue_id, uint64_t time)
+{
+  m->ids[ue_id].t_reloc_prep_start = time;
+}
+
+void x2ap_set_reloc_overall_timer(x2ap_id_manager *m, int ue_id, uint64_t time)
+{
+  m->ids[ue_id].tx2_reloc_overall_start = time;
+}
+
 int x2ap_id_get_id_source(x2ap_id_manager *m, int ue_id)
 {
   return m->ids[ue_id].id_source;
@@ -90,3 +121,8 @@ int x2ap_id_get_rnti(x2ap_id_manager *m, int ue_id)
 {
   return m->ids[ue_id].rnti;
 }
+
+void *x2ap_id_get_target(x2ap_id_manager *m, int ue_id)
+{
+  return m->ids[ue_id].target;
+}

openair2/X2AP/x2ap_ids.h

@@ -22,12 +22,38 @@
 #ifndef X2AP_IDS_H_
 #define X2AP_IDS_H_
 
+#include <stdint.h>
+
+/* maximum number of simultaneous handovers, do not set too high */
 #define X2AP_MAX_IDS	16
 
+/*
+ * state:
+ * - when starting handover in source, UE is in state X2ID_STATE_SOURCE_PREPARE
+ * - after receiving HO_ack in source, UE is in state X2ID_STATE_SOURCE_OVERALL
+ * - in target, UE is in state X2ID_STATE_TARGET
+ * The state is used to check timers.
+ */
+typedef enum {
+  X2ID_STATE_SOURCE_PREPARE,
+  X2ID_STATE_SOURCE_OVERALL,
+  X2ID_STATE_TARGET
+} x2id_state_t;
+
 typedef struct {
   int           rnti;             /* -1 when free */
   int           id_source;
   int           id_target;
+
+  /* the target eNB. Real type is x2ap_eNB_data_t * */
+  void          *target;
+
+  /* state: needed to check timers */
+  x2id_state_t  state;
+
+  /* timers */
+  uint64_t      t_reloc_prep_start;
+  uint64_t      tx2_reloc_overall_start;
 } x2ap_id;
 
 typedef struct {
@@ -38,10 +64,17 @@ void x2ap_id_manager_init(x2ap_id_manager *m);
 int x2ap_allocate_new_id(x2ap_id_manager *m);
 void x2ap_release_id(x2ap_id_manager *m, int id);
 int x2ap_find_id(x2ap_id_manager *, int id_source, int id_target);
+int x2ap_find_id_from_id_source(x2ap_id_manager *, int id_source);
 int x2ap_find_id_from_rnti(x2ap_id_manager *, int rnti);
 void x2ap_set_ids(x2ap_id_manager *m, int ue_id, int rnti, int id_source, int id_target);
+void x2ap_id_set_state(x2ap_id_manager *m, int ue_id, x2id_state_t state);
+/* real type of target is x2ap_eNB_data_t * */
+void x2ap_id_set_target(x2ap_id_manager *m, int ue_id, void *target);
+void x2ap_set_reloc_prep_timer(x2ap_id_manager *m, int ue_id, uint64_t time);
+void x2ap_set_reloc_overall_timer(x2ap_id_manager *m, int ue_id, uint64_t time);
 int x2ap_id_get_id_source(x2ap_id_manager *m, int ue_id);
 int x2ap_id_get_id_target(x2ap_id_manager *m, int ue_id);
 int x2ap_id_get_rnti(x2ap_id_manager *m, int ue_id);
+void *x2ap_id_get_target(x2ap_id_manager *m, int ue_id);
 
 #endif /* X2AP_IDS_H_ */

openair2/X2AP/x2ap_timers.c

+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#include "x2ap_timers.h"
+#include "assertions.h"
+#include "PHY/defs_common.h"         /* TODO: try to not include this */
+#include "x2ap_messages_types.h"
+#include "x2ap_eNB_defs.h"
+#include "x2ap_ids.h"
+#include "x2ap_eNB_management_procedures.h"
+#include "x2ap_eNB_generate_messages.h"
+
+void x2ap_timers_init(x2ap_timers_t *t, int t_reloc_prep, int tx2_reloc_overall)
+{
+  t->tti               = 0;
+  t->t_reloc_prep      = t_reloc_prep;
+  t->tx2_reloc_overall = tx2_reloc_overall;
+}
+
+void x2ap_check_timers(instance_t instance)
+{
+  x2ap_eNB_instance_t          *instance_p;
+  x2ap_timers_t                *t;
+  x2ap_id_manager              *m;
+  int                          i;
+  x2ap_handover_cancel_cause_t cause;
+  void                         *target;
+  MessageDef                   *msg;
+  int                          x2_ongoing;
+
+  instance_p = x2ap_eNB_get_instance(instance);
+  DevAssert(instance_p != NULL);
+
+  t = &instance_p->timers;
+  m = &instance_p->id_manager;
+
+  /* increment subframe count */
+  t->tti++;
+
+  x2_ongoing = 0;
+
+  for (i = 0; i < X2AP_MAX_IDS; i++) {
+    if (m->ids[i].rnti == -1) continue;
+    x2_ongoing++;
+
+    if (m->ids[i].state == X2ID_STATE_SOURCE_PREPARE &&
+        t->tti > m->ids[i].t_reloc_prep_start + t->t_reloc_prep) {
+      LOG_I(X2AP, "X2 timeout reloc prep\n");
+      /* t_reloc_prep timed out */
+      cause = X2AP_T_RELOC_PREP_TIMEOUT;
+      goto timeout;
+    }
+
+    if (m->ids[i].state == X2ID_STATE_SOURCE_OVERALL &&
+        t->tti > m->ids[i].tx2_reloc_overall_start + t->tx2_reloc_overall) {
+      LOG_I(X2AP, "X2 timeout reloc overall\n");
+      /* tx2_reloc_overall timed out */
+      cause = X2AP_TX2_RELOC_OVERALL_TIMEOUT;
+      goto timeout;
+    }
+
+    /* no timeout -> check next UE */
+    continue;
+
+timeout:
+    /* inform target about timeout */
+    target = x2ap_id_get_target(m, i);
+    x2ap_eNB_generate_x2_handover_cancel(instance_p, target, i, cause);
+
+    /* inform RRC of cancellation */
+    msg = itti_alloc_new_message(TASK_X2AP, X2AP_HANDOVER_CANCEL);
+    X2AP_HANDOVER_CANCEL(msg).rnti  = x2ap_id_get_rnti(m, i);
+    X2AP_HANDOVER_CANCEL(msg).cause = cause;
+    itti_send_msg_to_task(TASK_RRC_ENB, instance_p->instance, msg);
+
+    /* remove UE from X2AP */
+    x2ap_release_id(m, i);
+  }
+
+  if (x2_ongoing && t->tti % 1000 == 0)
+    LOG_I(X2AP, "X2 has %d process ongoing\n", x2_ongoing);
+}
+
+uint64_t x2ap_timer_get_tti(x2ap_timers_t *t)
+{
+  return t->tti;
+}

openair2/X2AP/x2ap_timers.h

+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#ifndef X2AP_TIMERS_H_
+#define X2AP_TIMERS_H_
+
+#include <stdint.h>
+#include "platform_types.h"
+
+typedef struct {
+  /* incremented every TTI (every millisecond when in realtime).
+   * Used to check timers.
+   * 64 bits gives us more than 500 million years of (realtime) processing.
+   * It should be enough.
+   */
+  uint64_t tti;
+
+  /* timer values (unit: TTI, ie. millisecond when in realtime) */
+  int      t_reloc_prep;
+  int      tx2_reloc_overall;
+} x2ap_timers_t;
+
+void x2ap_timers_init(x2ap_timers_t *t, int t_reloc_prep, int tx2_reloc_overall);
+void x2ap_check_timers(instance_t instance);
+uint64_t x2ap_timer_get_tti(x2ap_timers_t *t);
+
+#endif /* X2AP_TIMERS_H_ */

targets/COMMON/create_tasks.c

@@ -53,10 +53,13 @@ int create_tasks(uint32_t enb_nb) {
 
   if (EPC_MODE_ENABLED) {
     if (enb_nb > 0) {
+      if (is_x2ap_enabled()) {
         if (itti_create_task (TASK_X2AP, x2ap_task, NULL) < 0) {
           LOG_E(X2AP, "Create task for X2AP failed\n");
           return -1;
         }
+      } else
+        LOG_I(X2AP, "X2AP is disabled.\n");
 
       if (itti_create_task (TASK_SCTP, sctp_eNB_task, NULL) < 0) {
         LOG_E(SCTP, "Create task for SCTP failed\n");

targets/PROJECTS/CENTOS-LTE-EPC-INTEGRATION/CONF/enb.centos.calisson.conf

@@ -37,6 +37,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES : 
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

targets/PROJECTS/CENTOS-LTE-EPC-INTEGRATION/CONF/enb.centos.memphis.conf

@@ -49,6 +49,11 @@ eNBs =
                             }
 			    );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES : 
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

targets/PROJECTS/CENTOS-LTE-EPC-INTEGRATION/CONF/enb.centos.nord.conf

@@ -36,6 +36,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES : 
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth1";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band13.tm1.50PRB.emtc.conf

@@ -360,6 +360,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
 

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band38.tm1.100PRB.usrpx310.conf

@@ -142,6 +142,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band38.tm1.25PRB.iris030.conf

@@ -178,6 +178,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eno1";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band38.tm1.usrpx310.conf

@@ -142,6 +142,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band42.tm1.25PRB.iris030.conf

@@ -178,6 +178,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eno1";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.100PRB.usrpx310.conf

@@ -145,6 +145,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth6";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.25PRB.iris030.conf

@@ -178,6 +178,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "lo";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.25PRB.usrpb210.replay.conf

@@ -179,6 +179,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "lo";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.50PRB.usrpb210-d2d.conf

@@ -179,6 +179,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "lo";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.50PRB.usrpb210.conf

@@ -179,6 +179,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.50PRB.usrpb210_ue_expansion.conf

@@ -146,6 +146,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/rcc.band38.tm1.if4p5.50PRB.lo.conf

@@ -148,6 +148,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "lo";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/rcc.band7.tm1.50PRB.nfapi-STUB.conf

@@ -148,6 +148,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "vboxnet0";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/rcc.band7.tm1.50PRB.nfapi.conf

@@ -179,6 +179,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         #ENB_INTERFACE_NAME_FOR_S1_MME            = "lo";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/rcc.band7.tm1.if4p5.50PRB.conf

@@ -148,6 +148,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "eth0";

targets/PROJECTS/GENERIC-LTE-EPC/CONF/rcc.band7.tm1.if4p5.50PRB.lo.conf

@@ -147,6 +147,11 @@ eNBs =
                             }
                           );
 
+    ///X2
+    enable_x2 = "no";
+    t_reloc_prep      = 1000;      /* unit: millisecond */
+    tx2_reloc_overall = 2000;      /* unit: millisecond */
+
     NETWORK_INTERFACES :
     {
         ENB_INTERFACE_NAME_FOR_S1_MME            = "lo";