diff --git a/executables/nr-ue.c b/executables/nr-ue.c
index 075789e12b..38d0026c17 100644
--- a/executables/nr-ue.c
+++ b/executables/nr-ue.c
@@ -157,6 +157,7 @@ void init_nr_ue_vars(PHY_VARS_NR_UE *ue,
   ue->mac_enabled = 1;
   ue->if_inst     = nr_ue_if_module_init(0);
   ue->dci_thres   = 0;
+  ue->target_Nid_cell = -1;
 
   // initialize all signal buffers
   init_nr_ue_signal(ue, nb_connected_gNB);
@@ -413,7 +414,11 @@ static void UE_synch(void *arg) {
     */
   }
 
-  LOG_W(PHY, "Starting sync detection\n");
+  if (UE->target_Nid_cell != -1) {
+    LOG_W(NR_PHY, "Starting re-sync detection for target Nid_cell %i\n", UE->target_Nid_cell);
+  } else {
+    LOG_W(NR_PHY, "Starting sync detection\n");
+  }
 
   switch (sync_mode) {
     /*
@@ -597,6 +602,17 @@ void UE_processing(nr_rxtx_thread_data_t *rxtxD) {
   nr_phy_data_t phy_data = {0};
 
   if (IS_SOFTMODEM_NOS1 || get_softmodem_params()->sa) {
+
+    // Start synchronization with a target gNB
+    if (UE->synch_request.received_synch_request == 1 && UE->target_Nid_cell == -1) {
+      UE->is_synchronized = 0;
+      UE->target_Nid_cell = UE->synch_request.synch_req.target_Nid_cell;
+      clean_UE_ulsch(UE, proc->gNB_id);
+    } else if (UE->synch_request.received_synch_request == 1 && UE->target_Nid_cell != -1) {
+      UE->synch_request.received_synch_request = 0;
+      UE->target_Nid_cell = -1;
+    }
+
     /* send tick to RLC and PDCP every ms */
     if (proc->nr_slot_rx % UE->frame_parms.slots_per_subframe == 0) {
       void nr_rlc_tick(int frame, int subframe);
@@ -815,13 +831,13 @@ void *UE_thread(void *arg) {
 
     if (!UE->is_synchronized) {
       readFrame(UE, &timestamp, false);
-      notifiedFIFO_elt_t *Msg=newNotifiedFIFO_elt(sizeof(syncData_t),0,&nf,UE_synch);
-      syncData_t *syncMsg=(syncData_t *)NotifiedFifoData(Msg);
-      syncMsg->UE=UE;
+      notifiedFIFO_elt_t *Msg = newNotifiedFIFO_elt(sizeof(syncData_t), 0, &nf, UE_synch);
+      syncData_t *syncMsg = (syncData_t *)NotifiedFifoData(Msg);
+      syncMsg->UE = UE;
       memset(&syncMsg->proc, 0, sizeof(syncMsg->proc));
       pushTpool(&(get_nrUE_params()->Tpool), Msg);
-      trashed_frames=0;
-      syncRunning=true;
+      trashed_frames = 0;
+      syncRunning = true;
       continue;
     }
 
diff --git a/executables/nr-uesoftmodem.c b/executables/nr-uesoftmodem.c
index eb6e160ec3..5cef04f195 100644
--- a/executables/nr-uesoftmodem.c
+++ b/executables/nr-uesoftmodem.c
@@ -211,6 +211,11 @@ int create_tasks_nrue(uint32_t ue_nb) {
   }
 
   itti_wait_ready(0);
+
+  // Thread to update the RRC timers (in msec) at UE
+  pthread_t timers_update;
+  threadCreate(&timers_update, nr_rrc_timers_update, NULL, "nr_rrc_timer_update", -1, OAI_PRIORITY_RT_LOW);
+
   return 0;
 }
 
diff --git a/nfapi/open-nFAPI/nfapi/public_inc/fapi_nr_ue_interface.h b/nfapi/open-nFAPI/nfapi/public_inc/fapi_nr_ue_interface.h
index 94bf1b02dc..d429bf43ba 100644
--- a/nfapi/open-nFAPI/nfapi/public_inc/fapi_nr_ue_interface.h
+++ b/nfapi/open-nFAPI/nfapi/public_inc/fapi_nr_ue_interface.h
@@ -654,6 +654,10 @@ typedef struct
 
 } fapi_nr_prach_config_t;
 
+typedef struct {
+  uint16_t target_Nid_cell;
+} fapi_nr_synch_request_t;
+
 typedef struct {
   uint32_t config_mask;
 
diff --git a/openair1/PHY/NR_REFSIG/pss_nr.h b/openair1/PHY/NR_REFSIG/pss_nr.h
index 3b0e87109e..c5bc4f880e 100644
--- a/openair1/PHY/NR_REFSIG/pss_nr.h
+++ b/openair1/PHY/NR_REFSIG/pss_nr.h
@@ -126,12 +126,7 @@ void init_context_pss_nr(NR_DL_FRAME_PARMS *frame_parms_ue);
 void free_context_pss_nr(void);
 int set_pss_nr(int ofdm_symbol_size);
 int pss_synchro_nr(PHY_VARS_NR_UE *PHY_vars_UE, int is, int rate_change);
-int pss_search_time_nr(c16_t **rxdata, ///rx data in time domain
-                       NR_DL_FRAME_PARMS *frame_parms,
-		       int fo_flag,
-                       int is,
-                       int *eNB_id,
-		       int *f_off);
+int pss_search_time_nr(c16_t **rxdata, PHY_VARS_NR_UE *ue, int fo_flag, int is);
 
 #endif
 #undef EXTERN
diff --git a/openair1/PHY/NR_UE_TRANSPORT/nr_initial_sync.c b/openair1/PHY/NR_UE_TRANSPORT/nr_initial_sync.c
index 1904bed457..061eede6dd 100644
--- a/openair1/PHY/NR_UE_TRANSPORT/nr_initial_sync.c
+++ b/openair1/PHY/NR_UE_TRANSPORT/nr_initial_sync.c
@@ -300,11 +300,11 @@ int nr_initial_sync(UE_nr_rxtx_proc_t *proc,
       /* time samples in buffer rxdata are used as input of FFT -> FFT results are stored in the frequency buffer rxdataF */
       /* rxdataF stores SS/PBCH from beginning of buffers in the same symbol order as in time domain */
 
-      for(int i=0; i<4;i++)
+      for (int i = 0; i < NR_N_SYMBOLS_SSB; i++)
         nr_slot_fep_init_sync(ue,
                               proc,
                               i,
-                              is*fp->samples_per_frame+ue->ssb_offset,
+                              is * fp->samples_per_frame + ue->ssb_offset,
                               false,
                               rxdataF);
 
@@ -522,6 +522,10 @@ int nr_initial_sync(UE_nr_rxtx_proc_t *proc,
 
   }
 
+  if (ue->target_Nid_cell != -1) {
+    return ret;
+  }
+
   // if stand alone and sync on ssb do sib1 detection as part of initial sync
   if (sa==1 && ret==0) {
     nr_ue_dlsch_init(phy_data.dlsch, 1, ue->max_ldpc_iterations);
diff --git a/openair1/PHY/NR_UE_TRANSPORT/nr_transport_proto_ue.h b/openair1/PHY/NR_UE_TRANSPORT/nr_transport_proto_ue.h
index 7432c82aac..0d6c334c45 100644
--- a/openair1/PHY/NR_UE_TRANSPORT/nr_transport_proto_ue.h
+++ b/openair1/PHY/NR_UE_TRANSPORT/nr_transport_proto_ue.h
@@ -251,6 +251,8 @@ uint8_t nr_ue_pusch_common_procedures(PHY_VARS_NR_UE *UE,
                                       NR_DL_FRAME_PARMS *frame_parms,
                                       uint8_t Nl);
 
+int8_t clean_UE_ulsch(PHY_VARS_NR_UE *UE, uint8_t gNB_id);
+
 void nr_dlsch_unscrambling(int16_t* llr,
 			   uint32_t size,
 			   uint8_t q,
@@ -313,7 +315,7 @@ int dump_ue_stats(PHY_VARS_NR_UE *phy_vars_ue, UE_nr_rxtx_proc_t *proc, char* bu
   @param mode current running mode
 */
 int nr_initial_sync(UE_nr_rxtx_proc_t *proc,
-                    PHY_VARS_NR_UE *phy_vars_ue, 
+                    PHY_VARS_NR_UE *phy_vars_ue,
                     int n_frames,
                     int sa);
 
diff --git a/openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c b/openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c
index 9d0982689b..fc22a954fe 100644
--- a/openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c
+++ b/openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c
@@ -662,3 +662,15 @@ uint8_t nr_ue_pusch_common_procedures(PHY_VARS_NR_UE *UE,
   ////////////////////////////////////////////////////
   return 0;
 }
+
+int8_t clean_UE_ulsch(PHY_VARS_NR_UE *UE, uint8_t gNB_id)
+{
+  for (int harq_pid = 0; harq_pid < NR_MAX_ULSCH_HARQ_PROCESSES; harq_pid++) {
+    NR_UL_UE_HARQ_t *ul_harq_process = &UE->ul_harq_processes[harq_pid];
+    ul_harq_process->tx_status = NEW_TRANSMISSION_HARQ;
+    ul_harq_process->status = SCH_IDLE;
+    ul_harq_process->round = 0;
+    ul_harq_process->first_tx = 1;
+  }
+  return 0;
+}
diff --git a/openair1/PHY/NR_UE_TRANSPORT/pss_nr.c b/openair1/PHY/NR_UE_TRANSPORT/pss_nr.c
index fbb4a8a625..50f6fa2f34 100644
--- a/openair1/PHY/NR_UE_TRANSPORT/pss_nr.c
+++ b/openair1/PHY/NR_UE_TRANSPORT/pss_nr.c
@@ -555,12 +555,8 @@ int pss_synchro_nr(PHY_VARS_NR_UE *PHY_vars_UE, int is, int rate_change)
 #endif
 
   VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PSS_SEARCH_TIME_NR, VCD_FUNCTION_IN);
-  synchro_position = pss_search_time_nr(rxdata,
-                                        frame_parms,
-					fo_flag,
-                                        is,
-                                        (int *)&PHY_vars_UE->common_vars.eNb_id,
-					(int *)&PHY_vars_UE->common_vars.freq_offset);
+
+  synchro_position = pss_search_time_nr(rxdata, PHY_vars_UE, fo_flag, is);
 
   VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PSS_SEARCH_TIME_NR, VCD_FUNCTION_OUT);
 
@@ -605,7 +601,7 @@ int pss_synchro_nr(PHY_VARS_NR_UE *PHY_vars_UE, int is, int rate_change)
 *
 * NAME :         pss_search_time_nr
 *
-* PARAMETERS :   received buffer
+* PARAMETERS :   received buffer in time domain
 *                frame parameters
 *
 * RETURN :       position of detected pss
@@ -651,17 +647,15 @@ int pss_synchro_nr(PHY_VARS_NR_UE *PHY_vars_UE, int is, int rate_change)
 *
 *********************************************************************/
 
-int pss_search_time_nr(c16_t **rxdata, ///rx data in time domain
-                       NR_DL_FRAME_PARMS *frame_parms,
-		       int fo_flag,
-                       int is,
-                       int *eNB_id,
-		       int *f_off)
+int pss_search_time_nr(c16_t **rxdata, PHY_VARS_NR_UE *ue, int fo_flag, int is)
 {
+  NR_DL_FRAME_PARMS *frame_parms = &ue->frame_parms;
+  int *eNB_id = (int *)&ue->common_vars.eNb_id;
+  int *f_off = (int *)&ue->common_vars.freq_offset;
   unsigned int n, ar, peak_position, pss_source;
   int64_t peak_value;
-  int64_t avg[NUMBER_PSS_SEQUENCE]={0};
-  double ffo_est=0;
+  int64_t avg[NUMBER_PSS_SEQUENCE] = {0};
+  double ffo_est = 0;
 
   // performing the correlation on a frame length plus one symbol for the first of the two frame
   // to take into account the possibility of PSS in between the two frames 
@@ -692,7 +686,14 @@ int pss_search_time_nr(c16_t **rxdata, ///rx data in time domain
   /* This is required by SIMD (single instruction Multiple Data) Extensions of Intel processors. */
   /* Correlation computation is based on a a dot product which is realized thank to SIMS extensions */
 
-  for (int pss_index = 0; pss_index < NUMBER_PSS_SEQUENCE; pss_index++) {
+  uint16_t pss_index_start = 0;
+  uint16_t pss_index_end = NUMBER_PSS_SEQUENCE;
+  if (ue->target_Nid_cell != -1) {
+    pss_index_start = GET_NID2(ue->target_Nid_cell);
+    pss_index_end = pss_index_start + 1;
+  }
+
+  for (int pss_index = pss_index_start; pss_index < pss_index_end; pss_index++) {
     for (n = 0; n < length; n += 8) { //
 
       int64_t pss_corr_ue=0;
@@ -748,10 +749,10 @@ int pss_search_time_nr(c16_t **rxdata, ///rx data in time domain
   }
 
   // computing absolute value of frequency offset
-  *f_off = ffo_est*frame_parms->subcarrier_spacing;  
+  *f_off = ffo_est*frame_parms->subcarrier_spacing;
 
-  for (int pss_index = 0; pss_index < NUMBER_PSS_SEQUENCE; pss_index++)
-    avg[pss_index]/=(length/4);
+  for (int pss_index = pss_index_start; pss_index < pss_index_end; pss_index++)
+    avg[pss_index] /= (length / 4);
 
   *eNB_id = pss_source;
 
@@ -776,6 +777,6 @@ int pss_search_time_nr(c16_t **rxdata, ///rx data in time domain
 
 #endif
 
-  return(peak_position);
+  return peak_position;
 }
 
diff --git a/openair1/PHY/NR_UE_TRANSPORT/sss_nr.c b/openair1/PHY/NR_UE_TRANSPORT/sss_nr.c
index 3056315999..cdb45fc9c1 100644
--- a/openair1/PHY/NR_UE_TRANSPORT/sss_nr.c
+++ b/openair1/PHY/NR_UE_TRANSPORT/sss_nr.c
@@ -511,9 +511,15 @@ int rx_sss_nr(PHY_VARS_NR_UE *ue, UE_nr_rxtx_proc_t *proc, int32_t *tot_metric,
   /* cosinus cos(x + y) = cos(x)cos(y) - sin(x)sin(y) */
   /* sinus   sin(x + y) = sin(x)cos(y) + cos(x)sin(y) */
 
-   for (Nid1 = 0 ; Nid1 < N_ID_1_NUMBER; Nid1++) {          // all possible Nid1 values
-      for (phase=0; phase < PHASE_HYPOTHESIS_NUMBER; phase++) {  // phase offset between PSS and SSS
+  uint16_t Nid1_start = 0;
+  uint16_t Nid1_end = N_ID_1_NUMBER;
+  if (ue->target_Nid_cell != -1) {
+    Nid1_start = GET_NID1(ue->target_Nid_cell);
+    Nid1_end = Nid1_start + 1;
+  }
 
+  for (Nid1 = Nid1_start; Nid1 < Nid1_end; Nid1++) { // all possible Nid1 values
+    for (phase = 0; phase < PHASE_HYPOTHESIS_NUMBER; phase++) { // phase offset between PSS and SSS
 
       metric = 0;
       metric_re = 0;
@@ -523,7 +529,6 @@ int rx_sss_nr(PHY_VARS_NR_UE *ue, UE_nr_rxtx_proc_t *proc, int32_t *tot_metric,
       // This is the inner product using one particular value of each unknown parameter
       for (i=0; i < LENGTH_SSS_NR; i++) {
 
-	
         metric_re += d[i]*(((phase_re_nr[phase]*sss[2*i])>>SCALING_METRIC_SSS_NR) - ((phase_im_nr[phase]*sss[2*i+1])>>SCALING_METRIC_SSS_NR));
                    
 #if 0
diff --git a/openair1/PHY/defs_nr_UE.h b/openair1/PHY/defs_nr_UE.h
index 79e75ee325..9ba7233770 100644
--- a/openair1/PHY/defs_nr_UE.h
+++ b/openair1/PHY/defs_nr_UE.h
@@ -400,6 +400,8 @@ typedef struct {
   int if_freq_off;
   /// \brief Indicator that UE is synchronized to a gNB
   int is_synchronized;
+  /// \brief Target gNB Nid_cell when UE is resynchronizing
+  int target_Nid_cell;
   /// \brief Indicator that UE lost frame synchronization
   int lost_sync;
   /// Data structure for UE process scheduling
@@ -440,6 +442,7 @@ typedef struct {
   nr_ue_if_module_t *if_inst;
 
   fapi_nr_config_request_t nrUE_config;
+  nr_synch_request_t synch_request;
 
   NR_UE_PBCH      *pbch_vars[NUMBER_OF_CONNECTED_gNB_MAX];
   NR_UE_PRACH     *prach_vars[NUMBER_OF_CONNECTED_gNB_MAX];
diff --git a/openair1/SCHED_NR_UE/fapi_nr_ue_l1.c b/openair1/SCHED_NR_UE/fapi_nr_ue_l1.c
index b64be34f6e..255ecf17ca 100644
--- a/openair1/SCHED_NR_UE/fapi_nr_ue_l1.c
+++ b/openair1/SCHED_NR_UE/fapi_nr_ue_l1.c
@@ -548,3 +548,11 @@ int8_t nr_ue_phy_config_request(nr_phy_config_t *phy_config)
     memcpy(nrUE_config,&phy_config->config_req,sizeof(fapi_nr_config_request_t));
   return 0;
 }
+
+void nr_ue_synch_request(nr_synch_request_t *synch_request)
+{
+  fapi_nr_synch_request_t *synch_req = &PHY_vars_UE_g[synch_request->Mod_id][synch_request->CC_id]->synch_request.synch_req;
+  memcpy(synch_req, &synch_request->synch_req, sizeof(fapi_nr_synch_request_t));
+  PHY_vars_UE_g[synch_request->Mod_id][synch_request->CC_id]->synch_request.received_synch_request = 1;
+}
+
diff --git a/openair1/SCHED_NR_UE/fapi_nr_ue_l1.h b/openair1/SCHED_NR_UE/fapi_nr_ue_l1.h
index a0b0b805af..d83c014fa6 100644
--- a/openair1/SCHED_NR_UE/fapi_nr_ue_l1.h
+++ b/openair1/SCHED_NR_UE/fapi_nr_ue_l1.h
@@ -47,6 +47,10 @@ int8_t nr_ue_scheduled_response_stub(nr_scheduled_response_t *scheduled_response
    \param scheduled_response including transmission config(dl_config, ul_config) and data transmission (tx_req)*/
 int8_t nr_ue_phy_config_request(nr_phy_config_t *phy_config);
 
+/**\brief NR UE FAPI message to schedule a synchronization with target gNB
+   \param synch_request including target_Nid_cell*/
+void nr_ue_synch_request(nr_synch_request_t *synch_request);
+
 void update_harq_status(module_id_t module_id, uint8_t harq_pid, uint8_t ack_nack);
 
 #endif
diff --git a/openair1/SIMULATION/NR_PHY/dlsim.c b/openair1/SIMULATION/NR_PHY/dlsim.c
index 26ec99b80e..b2c9ac5a33 100644
--- a/openair1/SIMULATION/NR_PHY/dlsim.c
+++ b/openair1/SIMULATION/NR_PHY/dlsim.c
@@ -120,6 +120,10 @@ int8_t nr_mac_rrc_data_req_ue(const module_id_t Mod_idP,
   return 0;
 }
 
+int8_t nr_rrc_RA_succeeded(const module_id_t mod_id, const uint8_t gNB_index) {
+  return 0;
+}
+
 int nr_derive_key(int alg_type, uint8_t alg_id,
                const uint8_t key[32], uint8_t **out)
 {
diff --git a/openair1/SIMULATION/NR_PHY/prachsim.c b/openair1/SIMULATION/NR_PHY/prachsim.c
index d72bf2ed4f..629b7316b0 100644
--- a/openair1/SIMULATION/NR_PHY/prachsim.c
+++ b/openair1/SIMULATION/NR_PHY/prachsim.c
@@ -106,6 +106,10 @@ int8_t nr_mac_rrc_data_req_ue(const module_id_t Mod_idP,
   return 0;
 }
 
+int8_t nr_rrc_RA_succeeded(const module_id_t mod_id, const uint8_t gNB_index) {
+  return 0;
+}
+
 int nr_derive_key(int alg_type, uint8_t alg_id,
                const uint8_t key[32], uint8_t **out)
 {
diff --git a/openair1/SIMULATION/NR_PHY/ulsim.c b/openair1/SIMULATION/NR_PHY/ulsim.c
index 60b8eaca89..a13b8f37fa 100644
--- a/openair1/SIMULATION/NR_PHY/ulsim.c
+++ b/openair1/SIMULATION/NR_PHY/ulsim.c
@@ -116,6 +116,10 @@ int8_t nr_mac_rrc_data_req_ue(const module_id_t Mod_idP,
   return 0;
 }
 
+int8_t nr_rrc_RA_succeeded(const module_id_t mod_id, const uint8_t gNB_index) {
+  return 0;
+}
+
 int DU_send_INITIAL_UL_RRC_MESSAGE_TRANSFER(module_id_t     module_idP,
                                             int             CC_idP,
                                             int             UE_id,
diff --git a/openair2/LAYER2/NR_MAC_UE/config_ue.c b/openair2/LAYER2/NR_MAC_UE/config_ue.c
index 8ab321b9e1..bd08153aff 100644
--- a/openair2/LAYER2/NR_MAC_UE/config_ue.c
+++ b/openair2/LAYER2/NR_MAC_UE/config_ue.c
@@ -752,8 +752,8 @@ int nr_rrc_mac_config_req_ue(module_id_t module_id,
     config_control_ue(mac);
     // Setup the SSB to Rach Occasions mapping according to the config
     build_ssb_to_ro_map(mac);
-  }
-  else if (cell_group_config != NULL ){
+
+  } else if (cell_group_config != NULL) {
     LOG_I(MAC,"Applying CellGroupConfig from gNodeB\n");
     mac->cg = cell_group_config;
     if (cell_group_config->spCellConfig)
@@ -772,20 +772,38 @@ int nr_rrc_mac_config_req_ue(module_id_t module_id,
     configure_current_BWP(mac, NULL, cell_group_config);
     config_control_ue(mac);
 
-    if (get_softmodem_params()->nsa) {
-      if (cell_group_config->spCellConfig && cell_group_config->spCellConfig->reconfigurationWithSync) {
-        if (cell_group_config->spCellConfig->reconfigurationWithSync->rach_ConfigDedicated) {
-          ra->rach_ConfigDedicated = cell_group_config->spCellConfig->reconfigurationWithSync->rach_ConfigDedicated->choice.uplink;
-        }
-        mac->scc = cell_group_config->spCellConfig->reconfigurationWithSync->spCellConfigCommon;
-        int num_slots = mac->scc->tdd_UL_DL_ConfigurationCommon->pattern1.nrofUplinkSlots;
-        if (mac->scc->tdd_UL_DL_ConfigurationCommon->pattern1.nrofUplinkSymbols > 0) {
-          num_slots++;
-        }
-        mac->ul_config_request = calloc(num_slots, sizeof(*mac->ul_config_request));
-        config_common_ue(mac,module_id,cc_idP);
-        mac->crnti = cell_group_config->spCellConfig->reconfigurationWithSync->newUE_Identity;
-        LOG_I(MAC,"Configuring CRNTI %x\n",mac->crnti);
+    if (cell_group_config->spCellConfig && cell_group_config->spCellConfig->reconfigurationWithSync) {
+      LOG_A(NR_MAC, "Received the reconfigurationWithSync in %s\n", __FUNCTION__);
+      if (cell_group_config->spCellConfig->reconfigurationWithSync->rach_ConfigDedicated) {
+        ra->rach_ConfigDedicated = cell_group_config->spCellConfig->reconfigurationWithSync->rach_ConfigDedicated->choice.uplink;
+      }
+      mac->scc = cell_group_config->spCellConfig->reconfigurationWithSync->spCellConfigCommon;
+      if (mac->scc_SIB) {
+        free(mac->scc_SIB);
+        mac->scc_SIB = NULL;
+      }
+      int num_slots = mac->scc->tdd_UL_DL_ConfigurationCommon->pattern1.nrofUplinkSlots;
+      if (mac->scc->tdd_UL_DL_ConfigurationCommon->pattern1.nrofUplinkSymbols > 0) {
+        num_slots++;
+      }
+      mac->state = UE_NOT_SYNC;
+      mac->ra.ra_state = RA_UE_IDLE;
+      mac->physCellId = *mac->scc->physCellId;
+      if (!get_softmodem_params()->emulate_l1) {
+        mac->synch_request.Mod_id = module_id;
+        mac->synch_request.CC_id = cc_idP;
+        mac->synch_request.synch_req.target_Nid_cell = mac->physCellId;
+        mac->if_module->synch_request(&mac->synch_request);
+      }
+      mac->ul_config_request = calloc(num_slots, sizeof(*mac->ul_config_request));
+      config_common_ue(mac, module_id, cc_idP);
+      mac->crnti = cell_group_config->spCellConfig->reconfigurationWithSync->newUE_Identity;
+      LOG_I(MAC, "Configuring CRNTI %x\n", mac->crnti);
+
+      nr_ue_init_mac(module_id);
+      if (!get_softmodem_params()->emulate_l1) {
+        mac->if_module->phy_config_request(&mac->phy_config);
+        mac->phy_config_request_sent = true;
       }
 
       // Setup the SSB to Rach Occasions mapping according to the config
diff --git a/openair2/LAYER2/NR_MAC_UE/mac_defs.h b/openair2/LAYER2/NR_MAC_UE/mac_defs.h
index e3f4247bd6..b1af5393a1 100644
--- a/openair2/LAYER2/NR_MAC_UE/mac_defs.h
+++ b/openair2/LAYER2/NR_MAC_UE/mac_defs.h
@@ -446,6 +446,7 @@ typedef struct {
   ///     Interface module instances
   nr_ue_if_module_t       *if_module;
   nr_phy_config_t         phy_config;
+  nr_synch_request_t      synch_request;
 
   /// BSR report flag management
   uint8_t BSR_reporting_active;
diff --git a/openair2/LAYER2/NR_MAC_UE/mac_proto.h b/openair2/LAYER2/NR_MAC_UE/mac_proto.h
index 6015fe27bc..9776003e3f 100644
--- a/openair2/LAYER2/NR_MAC_UE/mac_proto.h
+++ b/openair2/LAYER2/NR_MAC_UE/mac_proto.h
@@ -371,7 +371,7 @@ void nr_ue_contention_resolution(module_id_t module_id, int cc_id, frame_t frame
 
 void nr_ra_failed(uint8_t mod_id, uint8_t CC_id, NR_PRACH_RESOURCES_t *prach_resources, frame_t frame, int slot);
 
-void nr_ra_succeeded(module_id_t mod_id, frame_t frame, int slot);
+void nr_ra_succeeded(const module_id_t mod_id, const uint8_t gNB_index, const frame_t frame, const int slot);
 
 void nr_get_RA_window(NR_UE_MAC_INST_t *mac);
 
diff --git a/openair2/LAYER2/NR_MAC_UE/nr_ra_procedures.c b/openair2/LAYER2/NR_MAC_UE/nr_ra_procedures.c
index c5800cfe14..ec9179e636 100644
--- a/openair2/LAYER2/NR_MAC_UE/nr_ra_procedures.c
+++ b/openair2/LAYER2/NR_MAC_UE/nr_ra_procedures.c
@@ -886,7 +886,7 @@ uint8_t nr_ue_get_rach(module_id_t mod_id,
 
         if(ra->cfra) {
           // Reset RA_active flag: it disables Msg3 retransmission (8.3 of TS 38.213)
-          nr_ra_succeeded(mod_id, frame, nr_slot_tx);
+          nr_ra_succeeded(mod_id, gNB_id, frame, nr_slot_tx);
         }
 
       } else if (ra->RA_window_cnt == 0 && !ra->RA_RAPID_found) {
@@ -1001,13 +1001,14 @@ void nr_ue_contention_resolution(module_id_t module_id, int cc_id, frame_t frame
 // according to section 5 of 3GPP TS 38.321 version 16.2.1 Release 16
 // todo:
 // - complete handling of received contention-based RA preamble
-void nr_ra_succeeded(module_id_t mod_id, frame_t frame, int slot){
-
+void nr_ra_succeeded(const module_id_t mod_id, const uint8_t gNB_index, const frame_t frame, const int slot)
+{
   NR_UE_MAC_INST_t *mac = get_mac_inst(mod_id);
   RA_config_t *ra = &mac->ra;
 
   if (ra->cfra) {
     LOG_I(MAC, "[UE %d][%d.%d][RAPROC] RA procedure succeeded. CF-RA: RAR successfully received.\n", mod_id, frame, slot);
+    nr_rrc_RA_succeeded(mod_id, gNB_index);
     mac->state = UE_CONNECTED;
     ra->RA_window_cnt = -1;
   } else {
diff --git a/openair2/LAYER2/NR_MAC_UE/nr_ue_dci_configuration.c b/openair2/LAYER2/NR_MAC_UE/nr_ue_dci_configuration.c
index e5b246f5c1..45b6a56978 100644
--- a/openair2/LAYER2/NR_MAC_UE/nr_ue_dci_configuration.c
+++ b/openair2/LAYER2/NR_MAC_UE/nr_ue_dci_configuration.c
@@ -269,7 +269,7 @@ void ue_dci_configuration(NR_UE_MAC_INST_t *mac, fapi_nr_dl_config_request_t *dl
   uint8_t bwp_id = mac->current_DL_BWP.bwp_id;
   //NR_ServingCellConfig_t *scd = mac->scg->spCellConfig->spCellConfigDedicated;
   NR_BWP_DownlinkDedicated_t *bwpd  = (bwp_id>0) ? mac->DLbwp[bwp_id-1]->bwp_Dedicated : (mac->cg ? mac->cg->spCellConfig->spCellConfigDedicated->initialDownlinkBWP : NULL);
-  NR_BWP_DownlinkCommon_t *bwp_Common = (bwp_id>0) ? mac->DLbwp[bwp_id-1]->bwp_Common : &mac->scc_SIB->downlinkConfigCommon.initialDownlinkBWP;
+  NR_BWP_DownlinkCommon_t *bwp_Common = get_bwp_downlink_common(mac, bwp_id);
 
   LOG_D(NR_MAC, "[DCI_CONFIG] ra_rnti %p (%x) crnti %p (%x) t_crnti %p (%x)\n", &ra->ra_rnti, ra->ra_rnti, &mac->crnti, mac->crnti, &ra->t_crnti, ra->t_crnti);
 
diff --git a/openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c b/openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c
index 4190331a3e..af1faf19eb 100644
--- a/openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c
+++ b/openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c
@@ -686,7 +686,7 @@ int8_t nr_ue_process_dci(module_id_t module_id, int cc_id, uint8_t gNB_index, fr
     /* dmrs symbol positions*/
     dlsch_config_pdu_1_0->dlDmrsSymbPos = fill_dmrs_mask(pdsch_config,
                                                          NR_DL_DCI_FORMAT_1_0,
-                                                         (get_softmodem_params()->nsa) ? mac->scc->dmrs_TypeA_Position : mac->mib->dmrs_TypeA_Position,
+                                                         mac->scc ? mac->scc->dmrs_TypeA_Position : mac->mib->dmrs_TypeA_Position,
                                                          dlsch_config_pdu_1_0->number_symbols,
                                                          dlsch_config_pdu_1_0->start_symbol,
                                                          tda_info.mapping_type,
@@ -2421,6 +2421,7 @@ static uint8_t nr_extract_dci_info(NR_UE_MAC_INST_t *mac,
   switch(dci_format) {
 
   case NR_DL_DCI_FORMAT_1_0:
+
     switch(rnti_type) {
     case NR_RNTI_RA:
       // Freq domain assignment
@@ -3256,7 +3257,7 @@ void nr_ue_process_mac_pdu(nr_downlink_indication_t *dl_info,
 	  }
 
           if ( (ra->RA_active == 1) && ra_success) {
-            nr_ra_succeeded(module_idP, frameP, slot);
+            nr_ra_succeeded(module_idP, gNB_index, frameP, slot);
           } else if (!ra_success){
             // TODO: Handle failure of RA procedure @ MAC layer
             //  nr_ra_failed(module_idP, CC_id, prach_resources, frameP, slot); // prach_resources is a PHY structure
diff --git a/openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c b/openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c
index deeb4a181a..b0d181f3da 100644
--- a/openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c
+++ b/openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c
@@ -495,7 +495,7 @@ int nr_config_pusch_pdu(NR_UE_MAC_INST_t *mac,
 
 #ifdef DEBUG_MSG3
     LOG_D(NR_MAC, "In %s BWP assignment (BWP (start %d, size %d) \n", __FUNCTION__, pusch_config_pdu->bwp_start, pusch_config_pdu->bwp_size);
-    #endif
+#endif
 
     // MCS
     pusch_config_pdu->mcs_index = rar_grant->mcs;
@@ -1399,6 +1399,8 @@ int nr_ue_pusch_scheduler(NR_UE_MAC_INST_t *mac, uint8_t is_Msg3, frame_t curren
       case 3:
         delta = 6;
         break;
+      default:
+        AssertFatal(1 == 0, "Invalid numerology %i\n", mu);
     }
 
     AssertFatal((k2 + delta) >= DURATION_RX_TO_TX,
diff --git a/openair2/LAYER2/NR_MAC_gNB/config.c b/openair2/LAYER2/NR_MAC_gNB/config.c
index 38ae19c72a..2f2a3fd577 100644
--- a/openair2/LAYER2/NR_MAC_gNB/config.c
+++ b/openair2/LAYER2/NR_MAC_gNB/config.c
@@ -650,7 +650,58 @@ bool nr_mac_update_cellgroup(gNB_MAC_INST *nrmac, uint32_t rnti, NR_CellGroupCon
     exit(1);
   }
 
+  nr_mac_update_RA(nrmac, rnti, CellGroup);
   process_CellGroup(CellGroup, &UE->UE_sched_ctrl);
 
   return true;
 }
+
+bool nr_mac_update_RA(gNB_MAC_INST *nrmac, uint32_t rnti, NR_CellGroupConfig_t *CellGroup)
+{
+  // Checking for free RA process
+  NR_COMMON_channels_t *cc = &nrmac->common_channels[0];
+  uint8_t ra_index = 0;
+  for (; ra_index < NR_NB_RA_PROC_MAX; ra_index++) {
+    if ((cc->ra[ra_index].state == RA_IDLE) && (!cc->ra[ra_index].cfra))
+      break;
+  }
+  if (ra_index == NR_NB_RA_PROC_MAX) {
+    LOG_E(NR_MAC, "%s() %s:%d RA processes are not available for CFRA RNTI :%x\n", __FUNCTION__, __FILE__, __LINE__, rnti);
+    return -1;
+  }
+
+  NR_RA_t *ra = &cc->ra[ra_index];
+  if (CellGroup->spCellConfig && CellGroup->spCellConfig->reconfigurationWithSync
+      && CellGroup->spCellConfig->reconfigurationWithSync->rach_ConfigDedicated != NULL) {
+    if (CellGroup->spCellConfig->reconfigurationWithSync->rach_ConfigDedicated->choice.uplink->cfra != NULL) {
+      ra->cfra = true;
+      ra->rnti = rnti;
+      ra->CellGroup = CellGroup;
+      struct NR_CFRA *cfra = CellGroup->spCellConfig->reconfigurationWithSync->rach_ConfigDedicated->choice.uplink->cfra;
+      uint8_t num_preamble = cfra->resources.choice.ssb->ssb_ResourceList.list.count;
+      ra->preambles.num_preambles = num_preamble;
+      ra->preambles.preamble_list = (uint8_t *)malloc(num_preamble * sizeof(uint8_t));
+      for (int i = 0; i < cc->num_active_ssb; i++) {
+        for (int j = 0; j < num_preamble; j++) {
+          if (cc->ssb_index[i] == cfra->resources.choice.ssb->ssb_ResourceList.list.array[j]->ssb) {
+            // One dedicated preamble for each beam
+            ra->preambles.preamble_list[i] = cfra->resources.choice.ssb->ssb_ResourceList.list.array[j]->ra_PreambleIndex;
+            break;
+          }
+        }
+      }
+    }
+  } else {
+    ra->cfra = false;
+    ra->rnti = 0;
+    if (ra->preambles.preamble_list == NULL) {
+      ra->preambles.num_preambles = MAX_NUM_NR_PRACH_PREAMBLES;
+      ra->preambles.preamble_list = (uint8_t *)malloc(MAX_NUM_NR_PRACH_PREAMBLES * sizeof(uint8_t));
+      for (int i = 0; i < MAX_NUM_NR_PRACH_PREAMBLES; i++)
+        ra->preambles.preamble_list[i] = i;
+    }
+  }
+  LOG_I(NR_MAC, "Added new %s process for UE RNTI %04x with initial CellGroup\n", ra->cfra ? "CFRA" : "CBRA", rnti);
+
+  return true;
+}
diff --git a/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c b/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c
index 2729ccc00a..587575241f 100644
--- a/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c
+++ b/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c
@@ -1375,10 +1375,18 @@ void nr_generate_Msg2(module_id_t module_idP, int CC_id, frame_t frameP, sub_fra
     nr_get_Msg3alloc(module_idP, CC_id, scc, slotP, frameP, ra, nr_mac->tdd_beam_association);
     nr_add_msg3(module_idP, CC_id, frameP, slotP, ra, (uint8_t *) &tx_req->TLVs[0].value.direct[0]);
 
-    if(ra->cfra) {
+    if (ra->cfra) {
+      NR_UE_info_t *UE = find_nr_UE(&RC.nrmac[module_idP]->UE_info, ra->rnti);
+      if (UE) {
+        const NR_ServingCellConfig_t *servingCellConfig = UE->CellGroup ? UE->CellGroup->spCellConfig->spCellConfigDedicated : NULL;
+        uint32_t delay_ms = servingCellConfig && servingCellConfig->downlinkBWP_ToAddModList ? NR_RRC_SETUP_DELAY_MS + NR_RRC_BWP_SWITCHING_DELAY_MS : NR_RRC_SETUP_DELAY_MS;
+        NR_UE_sched_ctrl_t *sched_ctrl = &UE->UE_sched_ctrl;
+        sched_ctrl->rrc_processing_timer = (delay_ms << ra->DL_BWP.scs);
+      }
       LOG_D(NR_MAC, "Frame %d, Subframe %d: Setting RA-Msg3 reception (CFRA) for SFN.Slot %d.%d\n", frameP, slotP, ra->Msg3_frame, ra->Msg3_slot);
+    } else {
+      LOG_D(NR_MAC, "Frame %d, Subframe %d: Setting RA-Msg3 reception (CBRA) for SFN.Slot %d.%d\n", frameP, slotP, ra->Msg3_frame, ra->Msg3_slot);
     }
-    else LOG_D(NR_MAC, "Frame %d, Subframe %d: Setting RA-Msg3 reception (CBRA) for SFN.Slot %d.%d\n", frameP, slotP, ra->Msg3_frame, ra->Msg3_slot);
 
     T(T_GNB_MAC_DL_RAR_PDU_WITH_DATA, T_INT(module_idP), T_INT(CC_id), T_INT(ra->RA_rnti), T_INT(frameP),
       T_INT(slotP), T_INT(0), T_BUFFER(&tx_req->TLVs[0].value.direct[0], tx_req->TLVs[0].length));
diff --git a/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c b/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c
index 6ded61a220..a51ebf7149 100644
--- a/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c
+++ b/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c
@@ -478,14 +478,29 @@ void abort_nr_ul_harq(NR_UE_info_t *UE, int8_t harq_pid)
     sched_ctrl->sched_ul_bytes = 0;
 }
 
+bool get_UE_waiting_CFRA_msg3(const gNB_MAC_INST *gNB_mac, const int CC_id, const frame_t frame, const sub_frame_t slot)
+{
+  bool UE_waiting_CFRA_msg3 = false;
+  for (int i = 0; i < NR_NB_RA_PROC_MAX; i++) {
+    const NR_RA_t *ra = &gNB_mac->common_channels[CC_id].ra[i];
+    if (ra->cfra == true && ra->state == WAIT_Msg3 && frame == ra->Msg3_frame && slot == ra->Msg3_slot) {
+      UE_waiting_CFRA_msg3 = true;
+      break;
+    }
+  }
+  return UE_waiting_CFRA_msg3;
+}
+
 void handle_nr_ul_harq(const int CC_idP,
                        module_id_t mod_id,
                        frame_t frame,
                        sub_frame_t slot,
                        const nfapi_nr_crc_t *crc_pdu)
 {
-  NR_UE_info_t* UE = find_nr_UE(&RC.nrmac[mod_id]->UE_info, crc_pdu->rnti);
-  if (!UE) {
+  NR_UE_info_t *UE = find_nr_UE(&RC.nrmac[mod_id]->UE_info, crc_pdu->rnti);
+  bool UE_waiting_CFRA_msg3 = get_UE_waiting_CFRA_msg3(RC.nrmac[mod_id], CC_idP, frame, slot);
+
+  if (!UE || UE_waiting_CFRA_msg3 == true) {
     LOG_W(NR_MAC, "handle harq for rnti %04x, in RA process\n", crc_pdu->rnti);
     for (int i = 0; i < NR_NB_RA_PROC_MAX; ++i) {
       NR_RA_t *ra = &RC.nrmac[mod_id]->common_channels[CC_idP].ra[i];
@@ -568,9 +583,12 @@ void nr_rx_sdu(const module_id_t gnb_mod_idP,
   LOG_D(NR_MAC, "rx_sdu for rnti %04x\n", current_rnti);
   const int target_snrx10 = gNB_mac->pusch_target_snrx10;
   const int pusch_failure_thres = gNB_mac->pusch_failure_thres;
-  
-  NR_UE_info_t* UE = find_nr_UE(&gNB_mac->UE_info, current_rnti);
-  if (UE) {
+
+  NR_UE_info_t *UE = find_nr_UE(&gNB_mac->UE_info, current_rnti);
+  bool UE_waiting_CFRA_msg3 = get_UE_waiting_CFRA_msg3(gNB_mac, CC_idP, frameP, slotP);
+
+  if (UE && UE_waiting_CFRA_msg3 == false) {
+
     NR_UE_sched_ctrl_t *UE_scheduling_control = &UE->UE_sched_ctrl;
     const int8_t harq_pid = UE_scheduling_control->feedback_ul_harq.head;
 
@@ -698,17 +716,19 @@ void nr_rx_sdu(const module_id_t gnb_mod_idP,
           continue;
         }
 
-        NR_UE_info_t *UE = add_new_nr_ue(gNB_mac, ra->rnti, ra->CellGroup);
-        if (!UE) {
-          LOG_W(NR_MAC, "Random Access %i discarded at state %i (TC_RNTI %04x RNTI %04x): max number of users achieved!\n", i, ra->state,ra->rnti,current_rnti);
+        NR_UE_info_t *UE_msg3_stage = UE ? UE : add_new_nr_ue(gNB_mac, ra->rnti, ra->CellGroup);
+        if (!UE_msg3_stage) {
+          LOG_W(NR_MAC, "Random Access %i discarded at state %i (TC_RNTI %04x RNTI %04x): max number of users achieved!\n", i, ra->state, ra->rnti, current_rnti);
+
+          nr_mac_remove_ra_rnti(gnb_mod_idP, ra->rnti);
           nr_clear_ra_proc(gnb_mod_idP, CC_idP, frameP, ra);
           return;
         }
 
-        UE->UE_beam_index = ra->beam_id;
+        UE_msg3_stage->UE_beam_index = ra->beam_id;
 
         // re-initialize ta update variables after RA procedure completion
-        UE->UE_sched_ctrl.ta_frame = frameP;
+        UE_msg3_stage->UE_sched_ctrl.ta_frame = frameP;
 
         LOG_D(NR_MAC,
               "reset RA state information for RA-RNTI 0x%04x/index %d\n",
@@ -722,18 +742,23 @@ void nr_rx_sdu(const module_id_t gnb_mod_idP,
               current_rnti,
               ra->rnti);
 
-        NR_UE_sched_ctrl_t *UE_scheduling_control = &UE->UE_sched_ctrl;
+        NR_UE_sched_ctrl_t *UE_scheduling_control = &UE_msg3_stage->UE_sched_ctrl;
 
-        UE_scheduling_control->tpc0 = nr_get_tpc(target_snrx10,ul_cqi,30);
+        UE_scheduling_control->tpc0 = nr_get_tpc(target_snrx10, ul_cqi, 30);
         if (timing_advance != 0xffff)
           UE_scheduling_control->ta_update = timing_advance;
         UE_scheduling_control->raw_rssi = rssi;
         UE_scheduling_control->pusch_snrx10 = ul_cqi * 5 - 640;
-        LOG_D(NR_MAC, "[UE %04x] PUSCH TPC %d and TA %d\n",UE->rnti,UE_scheduling_control->tpc0,UE_scheduling_control->ta_update);
-        if(ra->cfra) {
-
+        LOG_D(NR_MAC, "[UE %04x] PUSCH TPC %d and TA %d\n", UE_msg3_stage->rnti, UE_scheduling_control->tpc0, UE_scheduling_control->ta_update);
+        if (ra->cfra) {
           LOG_A(NR_MAC, "(rnti 0x%04x) CFRA procedure succeeded!\n", ra->rnti);
-          UE->ra_timer = 0;
+          nr_mac_gNB_rrc_ul_failure_reset(gnb_mod_idP, frameP, slotP, ra->rnti);
+          reset_dl_harq_list(UE_scheduling_control);
+          reset_ul_harq_list(UE_scheduling_control);
+          UE_scheduling_control->pusch_consecutive_dtx_cnt = 0;
+          UE_scheduling_control->ul_failure = 0;
+          UE_msg3_stage->ra_timer = 0;
+          nr_mac_remove_ra_rnti(gnb_mod_idP, ra->rnti);
           nr_clear_ra_proc(gnb_mod_idP, CC_idP, frameP, ra);
           process_CellGroup(ra->CellGroup, UE_scheduling_control);
 
@@ -751,7 +776,7 @@ void nr_rx_sdu(const module_id_t gnb_mod_idP,
           memcpy(ra->cont_res_id, &sduP[1], sizeof(uint8_t) * 6);
           // harq_pid set a non valid value because it is not used in this call
           // the function is only called to decode the contention resolution sub-header
-          if (nr_process_mac_pdu(gnb_mod_idP, UE, CC_idP, frameP, slotP, sduP, sdu_lenP, -1) == 0) {
+          if (nr_process_mac_pdu(gnb_mod_idP, UE_msg3_stage, CC_idP, frameP, slotP, sduP, sdu_lenP, -1) == 0) {
             
             if (ra->state == Msg3_dcch_dtch) {
               // Check if the UE identified by C-RNTI still exists at the gNB
diff --git a/openair2/LAYER2/NR_MAC_gNB/mac_proto.h b/openair2/LAYER2/NR_MAC_gNB/mac_proto.h
index fe880785aa..3ad1597213 100644
--- a/openair2/LAYER2/NR_MAC_gNB/mac_proto.h
+++ b/openair2/LAYER2/NR_MAC_gNB/mac_proto.h
@@ -58,6 +58,7 @@ void nr_mac_config_sib1(gNB_MAC_INST *nrmac, NR_BCCH_DL_SCH_Message_t *sib1);
 bool nr_mac_add_test_ue(gNB_MAC_INST *nrmac, uint32_t rnti, NR_CellGroupConfig_t *CellGroup);
 bool nr_mac_prepare_ra_nsa_ue(gNB_MAC_INST *nrmac, uint32_t rnti, NR_CellGroupConfig_t *CellGroup);
 bool nr_mac_update_cellgroup(gNB_MAC_INST *nrmac, uint32_t rnti, NR_CellGroupConfig_t *CellGroup);
+bool nr_mac_update_RA(gNB_MAC_INST *nrmac, uint32_t rnti, NR_CellGroupConfig_t *CellGroup);
 
 void clear_nr_nfapi_information(gNB_MAC_INST * gNB, 
                                 int CC_idP,
diff --git a/openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.c b/openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.c
index 87d8527eb9..5ddd59fcc1 100644
--- a/openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.c
+++ b/openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.c
@@ -1239,6 +1239,7 @@ nr_ue_if_module_t *nr_ue_if_module_init(uint32_t module_id){
     nr_ue_if_module_inst[module_id]->current_frame = 0;
     nr_ue_if_module_inst[module_id]->current_slot = 0;
     nr_ue_if_module_inst[module_id]->phy_config_request = nr_ue_phy_config_request;
+    nr_ue_if_module_inst[module_id]->synch_request = nr_ue_synch_request;
     if (get_softmodem_params()->emulate_l1)
       nr_ue_if_module_inst[module_id]->scheduled_response = nr_ue_scheduled_response_stub;
     else
diff --git a/openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.h b/openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.h
index e3adfe7d53..91775794ed 100644
--- a/openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.h
+++ b/openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.h
@@ -151,6 +151,16 @@ typedef struct {
 
 } nr_phy_config_t;
 
+typedef struct {
+    /// module id
+    uint8_t Mod_id;
+    /// component carrier id
+    uint8_t CC_id;
+    /// Flag signaling that synch_request was received
+    uint8_t received_synch_request;
+    /// NR UE FAPI message
+    fapi_nr_synch_request_t synch_req;
+} nr_synch_request_t;
 
 /*
  * Generic type of an application-defined callback to return various
@@ -171,6 +181,12 @@ typedef int8_t (nr_ue_scheduled_response_f)(nr_scheduled_response_t *scheduled_r
  */
 typedef int8_t (nr_ue_phy_config_request_f)(nr_phy_config_t *phy_config);
 
+/*
+ * Generic type of an application-defined callback to return various
+ * types of data to the application.
+ */
+typedef void (nr_ue_synch_request_f)(nr_synch_request_t *synch_request);
+
 
 /*
  * Generic type of an application-defined callback to return various
@@ -196,6 +212,7 @@ typedef int (nr_ue_dcireq_f)(nr_dcireq_t *ul_info);
 typedef struct nr_ue_if_module_s {
   nr_ue_scheduled_response_f *scheduled_response;
   nr_ue_phy_config_request_f *phy_config_request;
+  nr_ue_synch_request_f      *synch_request;
   nr_ue_dl_indication_f      *dl_indication;
   nr_ue_ul_indication_f      *ul_indication;
   //nr_ue_dcireq_f             *dcireq;
diff --git a/openair2/RRC/NR_UE/L2_interface_ue.c b/openair2/RRC/NR_UE/L2_interface_ue.c
index c67069e975..f3997fcdbe 100644
--- a/openair2/RRC/NR_UE/L2_interface_ue.c
+++ b/openair2/RRC/NR_UE/L2_interface_ue.c
@@ -185,3 +185,13 @@ rrc_data_req_nr_ue(
     return true; // TODO should be changed to a CNF message later, currently RRC lite does not used the returned value anyway.
 
 }
+
+int8_t nr_rrc_RA_succeeded(const module_id_t mod_id, const uint8_t gNB_index)
+{
+  if (NR_UE_rrc_inst[mod_id].Info[gNB_index].T304_active == 1) {
+    LOG_W(NR_RRC, "T304 was stoped with value %i\n", NR_UE_rrc_inst[mod_id].Info[gNB_index].T304_cnt);
+    NR_UE_rrc_inst[mod_id].Info[gNB_index].T304_active = 0;
+    NR_UE_rrc_inst[mod_id].Info[gNB_index].T304_cnt = 0;
+  }
+  return 0;
+}
\ No newline at end of file
diff --git a/openair2/RRC/NR_UE/rrc_UE.c b/openair2/RRC/NR_UE/rrc_UE.c
index ecbaeea17e..6ee8c762fc 100644
--- a/openair2/RRC/NR_UE/rrc_UE.c
+++ b/openair2/RRC/NR_UE/rrc_UE.c
@@ -1286,10 +1286,38 @@ nr_rrc_ue_process_masterCellGroup(
     xer_fprint(stdout, &asn_DEF_NR_CellGroupConfig, (const void *) cellGroupConfig);
   }
 
-  if( cellGroupConfig->spCellConfig != NULL &&  cellGroupConfig->spCellConfig->reconfigurationWithSync != NULL){
-    //TODO (perform Reconfiguration with sync according to 5.3.5.5.2)
-    //TODO (resume all suspended radio bearers and resume SCG transmission for all radio bearers, if suspended)
-    // NSA procedures
+  // TS 38.331 - Section 5.3.5.5.2 Reconfiguration with sync
+  if (cellGroupConfig->spCellConfig != NULL && cellGroupConfig->spCellConfig->reconfigurationWithSync != NULL) {
+
+    LOG_A(NR_RRC, "Received the reconfigurationWithSync in %s\n", __FUNCTION__);
+
+    NR_ReconfigurationWithSync_t *reconfigurationWithSync = cellGroupConfig->spCellConfig->reconfigurationWithSync;
+    NR_UE_rrc_inst[ctxt_pP->module_id].Info[gNB_index].T304_active = 1;
+    switch (reconfigurationWithSync->t304) {
+      case NR_ReconfigurationWithSync__t304_ms100:
+        NR_UE_rrc_inst[ctxt_pP->module_id].Info[gNB_index].T304_cnt = 100;
+        break;
+      case NR_ReconfigurationWithSync__t304_ms150:
+        NR_UE_rrc_inst[ctxt_pP->module_id].Info[gNB_index].T304_cnt = 150;
+        break;
+      case NR_ReconfigurationWithSync__t304_ms200:
+        NR_UE_rrc_inst[ctxt_pP->module_id].Info[gNB_index].T304_cnt = 200;
+        break;
+      case NR_ReconfigurationWithSync__t304_ms500:
+        NR_UE_rrc_inst[ctxt_pP->module_id].Info[gNB_index].T304_cnt = 500;
+        break;
+      case NR_ReconfigurationWithSync__t304_ms1000:
+        NR_UE_rrc_inst[ctxt_pP->module_id].Info[gNB_index].T304_cnt = 1000;
+        break;
+      case NR_ReconfigurationWithSync__t304_ms2000:
+        NR_UE_rrc_inst[ctxt_pP->module_id].Info[gNB_index].T304_cnt = 2000;
+        break;
+      case NR_ReconfigurationWithSync__t304_ms10000:
+        NR_UE_rrc_inst[ctxt_pP->module_id].Info[gNB_index].T304_cnt = 10000;
+        break;
+      default:
+        NR_UE_rrc_inst[ctxt_pP->module_id].Info[gNB_index].T304_cnt = 50;
+    }
   }
 
   if(NR_UE_rrc_inst[ctxt_pP->module_id].cell_group_config == NULL){
@@ -2862,3 +2890,29 @@ void process_lte_nsa_msg(nsa_msg_t *msg, int msg_len)
             LOG_E(NR_RRC, "No NSA Message Found\n");
     }
 }
+
+void *nr_rrc_timers_update() {
+
+  while (1) {
+
+    for (int mod_id = 0; mod_id < NB_NR_UE_INST; mod_id++) {
+      for (int i = 0; i < NB_SIG_CNX_UE; i++) {
+        NR_UE_RRC_INFO *timers = &NR_UE_rrc_inst[mod_id].Info[i];
+
+        // T304
+        if (timers->T304_active == 1) {
+          if ((timers->T304_cnt % 100) == 0) {
+            LOG_W(NR_RRC, "T304: %u\n", timers->T304_cnt);
+          }
+          if (timers->T304_cnt == 1) {
+            timers->T304_active = 0;
+          }
+          timers->T304_cnt--;
+        }
+
+      }
+    }
+
+    usleep(1000);
+  }
+}
diff --git a/openair2/RRC/NR_UE/rrc_proto.h b/openair2/RRC/NR_UE/rrc_proto.h
index 510fbff230..2739c7ccf8 100644
--- a/openair2/RRC/NR_UE/rrc_proto.h
+++ b/openair2/RRC/NR_UE/rrc_proto.h
@@ -156,10 +156,15 @@ rrc_data_req_nr_ue(
   const pdcp_transmission_mode_t modeP
 );
 
+int8_t nr_rrc_RA_succeeded(const module_id_t mod_id, const uint8_t gNB_index);
+
 /**\brief RRC UE task.
    \param void *args_p Pointer on arguments to start the task. */
 void *rrc_nrue_task(void *args_p);
 
+/**\brief RRC timers update at UE. */
+void *nr_rrc_timers_update();
+
 /**\brief RRC NSA UE task.
    \param void *args_p Pointer on arguments to start the task. */
 void *recv_msgs_from_lte_ue(void *args_p);