diff --git a/common/utils/nr/nr_common.c b/common/utils/nr/nr_common.c
index 24e04f833a..73f4f89241 100644
--- a/common/utils/nr/nr_common.c
+++ b/common/utils/nr/nr_common.c
@@ -865,3 +865,44 @@ void nr_est_delay(int ofdm_symbol_size, const c16_t *ls_est, c16_t *ch_estimates
   delay->delay_max_val = max_val;
   delay->est_delay = max_pos - sync_pos;
 }
+
+void nr_timer_start(NR_timer_t *timer)
+{
+  timer->active = true;
+  timer->counter = 0;
+}
+
+void nr_timer_stop(NR_timer_t *timer)
+{
+  timer->active = false;
+  timer->counter = 0;
+}
+
+bool is_nr_timer_active(NR_timer_t timer)
+{
+  return timer.active;
+}
+
+bool nr_timer_tick(NR_timer_t *timer)
+{
+  bool expired = false;
+  if (timer->active) {
+    timer->counter += timer->step;
+    expired = nr_timer_expired(*timer);
+    if (expired)
+      timer->active = false;
+  }
+  return expired;
+}
+
+bool nr_timer_expired(NR_timer_t timer)
+{
+  return (timer.counter >= timer.target);
+}
+
+void nr_timer_setup(NR_timer_t *timer, const uint32_t target, const uint32_t step)
+{
+  timer->target = target;
+  timer->step = step;
+  nr_timer_stop(timer);
+}
diff --git a/common/utils/nr/nr_common.h b/common/utils/nr/nr_common.h
index 3cc3844cc4..671f232928 100644
--- a/common/utils/nr/nr_common.h
+++ b/common/utils/nr/nr_common.h
@@ -116,6 +116,49 @@ typedef struct {
   int delay_max_val;
 } delay_t;
 
+typedef struct {
+  bool active;
+  uint32_t counter;
+  uint32_t target;
+  uint32_t step;
+} NR_timer_t;
+
+/**
+ * @brief To start a timer
+ * @param timer Timer to be started
+ */
+void nr_timer_start(NR_timer_t *timer);
+/**
+ * @brief To stop a timer
+ * @param timer Timer to stopped
+ */
+void nr_timer_stop(NR_timer_t *timer);
+/**
+ * @brief If active, it increases timer counter by an amout of units equal to step. It stops timer if expired
+ * @param timer Timer to be handled
+ * @return Indication if the timer is expired or not
+ */
+bool nr_timer_tick(NR_timer_t *timer);
+/**
+ * @brief To setup a timer
+ * @param timer Timer to setup
+ * @param target Target value for timer (when reached, timer is considered expired)
+ * @param step Amount of units to add to timer counter every tick
+ */
+void nr_timer_setup(NR_timer_t *timer, const uint32_t target, const uint32_t step);
+/**
+ * @brief To check if a timer is expired
+ * @param timer Timer to be checked
+ * @return Indication if the timer is expired or not
+ */
+bool nr_timer_expired(NR_timer_t timer);
+/**
+ * @brief To check if a timer is active
+ * @param timer Timer to be checked
+ * @return Indication if the timer is active or not
+ */
+bool is_nr_timer_active(NR_timer_t timer);
+
 extern const nr_bandentry_t nr_bandtable[];
 
 static inline int get_num_dmrs(uint16_t dmrs_mask ) {
diff --git a/openair2/RRC/NR_UE/rrc_UE.c b/openair2/RRC/NR_UE/rrc_UE.c
index a1391927b6..a38c0fded0 100644
--- a/openair2/RRC/NR_UE/rrc_UE.c
+++ b/openair2/RRC/NR_UE/rrc_UE.c
@@ -33,7 +33,6 @@
 #define RRC_UE
 #define RRC_UE_C
 
-#include "oai_asn1.h"
 #include "NR_DL-DCCH-Message.h"        //asn_DEF_NR_DL_DCCH_Message
 #include "NR_DL-CCCH-Message.h"        //asn_DEF_NR_DL_CCCH_Message
 #include "NR_BCCH-BCH-Message.h"       //asn_DEF_NR_BCCH_BCH_Message
@@ -311,9 +310,12 @@ NR_UE_RRC_INST_t* nr_rrc_init_ue(char* uecap_file, int nb_inst)
     rrc->ra_trigger = RA_NOT_RUNNING;
     rrc->uecap_file = uecap_file;
 
+    memset(&rrc->timers_and_constants, 0, sizeof(rrc->timers_and_constants));
+
     for (int i = 0; i < NB_CNX_UE; i++) {
       rrcPerNB_t *ptr = &rrc->perNB[i];
       ptr->SInfo = (NR_UE_RRC_SI_INFO){0};
+      init_SI_timers(&ptr->SInfo);
       for (int j = 0; j < NR_NUM_SRB; j++)
         ptr->Srb[j] = RB_NOT_PRESENT;
       for (int j = 0; j < MAX_DRBS_PER_UE; j++)
@@ -334,57 +336,44 @@ bool check_si_validity(NR_UE_RRC_SI_INFO *SI_info, int si_type)
 {
   switch (si_type) {
     case NR_SIB_TypeInfo__type_sibType2:
-      if (!SI_info->sib2 || SI_info->sib2_timer == -1)
+      if (!SI_info->sib2)
         return false;
-      break;
     case NR_SIB_TypeInfo__type_sibType3:
-      if (!SI_info->sib3 || SI_info->sib3_timer == -1)
+      if (!SI_info->sib3)
         return false;
-      break;
     case NR_SIB_TypeInfo__type_sibType4:
-      if (!SI_info->sib4 || SI_info->sib4_timer == -1)
+      if (!SI_info->sib4)
         return false;
-      break;
     case NR_SIB_TypeInfo__type_sibType5:
-      if (!SI_info->sib5 || SI_info->sib5_timer == -1)
+      if (!SI_info->sib5)
         return false;
-      break;
     case NR_SIB_TypeInfo__type_sibType6:
-      if (!SI_info->sib6 || SI_info->sib6_timer == -1)
+      if (!SI_info->sib6)
         return false;
-      break;
     case NR_SIB_TypeInfo__type_sibType7:
-      if (!SI_info->sib7 || SI_info->sib7_timer == -1)
+      if (!SI_info->sib7)
         return false;
-      break;
     case NR_SIB_TypeInfo__type_sibType8:
-      if (!SI_info->sib8 || SI_info->sib8_timer == -1)
+      if (!SI_info->sib8)
         return false;
-      break;
     case NR_SIB_TypeInfo__type_sibType9:
-      if (!SI_info->sib9 || SI_info->sib9_timer == -1)
+      if (!SI_info->sib9)
         return false;
-      break;
     case NR_SIB_TypeInfo__type_sibType10_v1610:
-      if (!SI_info->sib10 || SI_info->sib10_timer == -1)
+      if (!SI_info->sib10)
         return false;
-      break;
     case NR_SIB_TypeInfo__type_sibType11_v1610:
-      if (!SI_info->sib11 || SI_info->sib11_timer == -1)
+      if (!SI_info->sib11)
         return false;
-      break;
     case NR_SIB_TypeInfo__type_sibType12_v1610:
-      if (!SI_info->sib12 || SI_info->sib12_timer == -1)
+      if (!SI_info->sib12)
         return false;
-      break;
     case NR_SIB_TypeInfo__type_sibType13_v1610:
-      if (!SI_info->sib13 || SI_info->sib13_timer == -1)
+      if (!SI_info->sib13)
         return false;
-      break;
     case NR_SIB_TypeInfo__type_sibType14_v1610:
-      if (!SI_info->sib14 || SI_info->sib14_timer == -1)
+      if (!SI_info->sib14)
         return false;
-      break;
     default :
       AssertFatal(false, "Invalid SIB type %d\n", si_type);
   }
@@ -394,8 +383,7 @@ bool check_si_validity(NR_UE_RRC_SI_INFO *SI_info, int si_type)
 int check_si_status(NR_UE_RRC_SI_INFO *SI_info)
 {
   // schedule reception of SIB1 if RRC doesn't have it
-  // or if the timer expired
-  if (!SI_info->sib1 || SI_info->sib1_timer == -1)
+  if (!SI_info->sib1)
     return 1;
   else {
     if (SI_info->sib1->si_SchedulingInfo) {
@@ -471,91 +459,91 @@ static int nr_decode_SI(NR_UE_RRC_SI_INFO *SI_info, NR_SystemInformation_t *si)
         if(!SI_info->sib2)
           SI_info->sib2 = calloc(1, sizeof(*SI_info->sib2));
         memcpy(SI_info->sib2, typeandinfo->choice.sib2, sizeof(NR_SIB2_t));
-        SI_info->sib2_timer = 0;
+        nr_timer_start(&SI_info->sib2_timer);
         break;
 
       case NR_SystemInformation_IEs__sib_TypeAndInfo__Member_PR_sib3:
         if(!SI_info->sib3)
           SI_info->sib3 = calloc(1, sizeof(*SI_info->sib3));
         memcpy(SI_info->sib3, typeandinfo->choice.sib3, sizeof(NR_SIB3_t));
-        SI_info->sib3_timer = 0;
+        nr_timer_start(&SI_info->sib3_timer);
         break;
 
       case NR_SystemInformation_IEs__sib_TypeAndInfo__Member_PR_sib4:
         if(!SI_info->sib4)
           SI_info->sib4 = calloc(1, sizeof(*SI_info->sib4));
         memcpy(SI_info->sib4, typeandinfo->choice.sib4, sizeof(NR_SIB4_t));
-        SI_info->sib4_timer = 0;
+        nr_timer_start(&SI_info->sib4_timer);
         break;
 
       case NR_SystemInformation_IEs__sib_TypeAndInfo__Member_PR_sib5:
         if(!SI_info->sib5)
           SI_info->sib5 = calloc(1, sizeof(*SI_info->sib5));
         memcpy(SI_info->sib5, typeandinfo->choice.sib5, sizeof(NR_SIB5_t));
-        SI_info->sib5_timer = 0;
+        nr_timer_start(&SI_info->sib5_timer);
         break;
 
       case NR_SystemInformation_IEs__sib_TypeAndInfo__Member_PR_sib6:
         if(!SI_info->sib6)
           SI_info->sib6 = calloc(1, sizeof(*SI_info->sib6));
         memcpy(SI_info->sib6, typeandinfo->choice.sib6, sizeof(NR_SIB6_t));
-        SI_info->sib6_timer = 0;
+        nr_timer_start(&SI_info->sib6_timer);
         break;
 
       case NR_SystemInformation_IEs__sib_TypeAndInfo__Member_PR_sib7:
         if(!SI_info->sib7)
           SI_info->sib7 = calloc(1, sizeof(*SI_info->sib7));
         memcpy(SI_info->sib7, typeandinfo->choice.sib7, sizeof(NR_SIB7_t));
-        SI_info->sib7_timer = 0;
+        nr_timer_start(&SI_info->sib7_timer);
         break;
 
       case NR_SystemInformation_IEs__sib_TypeAndInfo__Member_PR_sib8:
         if(!SI_info->sib8)
           SI_info->sib8 = calloc(1, sizeof(*SI_info->sib8));
         memcpy(SI_info->sib8, typeandinfo->choice.sib8, sizeof(NR_SIB8_t));
-        SI_info->sib8_timer = 0;
+        nr_timer_start(&SI_info->sib8_timer);
         break;
 
       case NR_SystemInformation_IEs__sib_TypeAndInfo__Member_PR_sib9:
         if(!SI_info->sib9)
           SI_info->sib9 = calloc(1, sizeof(*SI_info->sib9));
         memcpy(SI_info->sib9, typeandinfo->choice.sib9, sizeof(NR_SIB9_t));
-        SI_info->sib9_timer = 0;
+        nr_timer_start(&SI_info->sib9_timer);
         break;
 
       case NR_SystemInformation_IEs__sib_TypeAndInfo__Member_PR_sib10_v1610:
         if(!SI_info->sib10)
           SI_info->sib10 = calloc(1, sizeof(*SI_info->sib10));
         memcpy(SI_info->sib10, typeandinfo->choice.sib10_v1610, sizeof(NR_SIB10_r16_t));
-        SI_info->sib10_timer = 0;
+        nr_timer_start(&SI_info->sib10_timer);
         break;
 
       case NR_SystemInformation_IEs__sib_TypeAndInfo__Member_PR_sib11_v1610:
         if(!SI_info->sib11)
           SI_info->sib11 = calloc(1, sizeof(*SI_info->sib11));
         memcpy(SI_info->sib11, typeandinfo->choice.sib11_v1610, sizeof(NR_SIB11_r16_t));
-        SI_info->sib11_timer = 0;
+        nr_timer_start(&SI_info->sib11_timer);
         break;
 
       case NR_SystemInformation_IEs__sib_TypeAndInfo__Member_PR_sib12_v1610:
         if(!SI_info->sib12)
           SI_info->sib12 = calloc(1, sizeof(*SI_info->sib12));
         memcpy(SI_info->sib12, typeandinfo->choice.sib12_v1610, sizeof(NR_SIB12_r16_t));
-        SI_info->sib12_timer = 0;
+        nr_timer_start(&SI_info->sib12_timer);
         break;
 
       case NR_SystemInformation_IEs__sib_TypeAndInfo__Member_PR_sib13_v1610:
         if(!SI_info->sib13)
           SI_info->sib13 = calloc(1, sizeof(*SI_info->sib13));
         memcpy(SI_info->sib13, typeandinfo->choice.sib13_v1610, sizeof(NR_SIB13_r16_t));
-        SI_info->sib13_timer = 0;
+        nr_timer_start(&SI_info->sib13_timer);
         break;
 
       case NR_SystemInformation_IEs__sib_TypeAndInfo__Member_PR_sib14_v1610:
         if(!SI_info->sib14)
           SI_info->sib14 = calloc(1, sizeof(*SI_info->sib14));
         memcpy(SI_info->sib12, typeandinfo->choice.sib14_v1610, sizeof(NR_SIB14_r16_t));
-        SI_info->sib14_timer = 0;
+        nr_timer_start(&SI_info->sib14_timer);
         break;
       default:
         break;
@@ -573,7 +561,7 @@ static void nr_rrc_handle_msg3_indication(NR_UE_RRC_INST_t *rrc, rnti_t rnti)
       rrc->rnti = rnti;
       // start timer T300
       NR_UE_Timers_Constants_t *tac = &rrc->timers_and_constants;
-      tac->T300_active = true;
+      nr_timer_start(&tac->T300);
       break;
     case RRC_CONNECTION_REESTABLISHMENT:
       AssertFatal(1==0, "ra_trigger not implemented yet!\n");
@@ -682,7 +670,7 @@ static int8_t nr_rrc_ue_decode_NR_BCCH_DL_SCH_Message(NR_UE_RRC_INST_t *rrc,
         if(g_log->log_component[NR_RRC].level >= OAILOG_DEBUG)
           xer_fprint(stdout, &asn_DEF_NR_SIB1, (const void *) SI_info->sib1);
         LOG_A(NR_RRC, "SIB1 decoded\n");
-        SI_info->sib1_timer = 0;
+        nr_timer_start(&SI_info->sib1_timer);
         if (rrc->nrRrcState == RRC_STATE_IDLE_NR) {
           rrc->ra_trigger = INITIAL_ACCESS_FROM_RRC_IDLE;
           // preparing RRC setup request payload in advance
@@ -760,13 +748,10 @@ void nr_rrc_cellgroup_configuration(rrcPerNB_t *rrcNB, NR_UE_RRC_INST_t *rrc, NR
         // with the release cause 'other' upon which the procedure ends
         // TODO
       }
-      if (tac->T310_active) {
-        tac->T310_active = false;
-        tac->T310_cnt = 0;
-      }
-      nr_rrc_set_T304(&rrc->timers_and_constants, reconfigurationWithSync);
-      tac->T304_active = true;
-      tac->T304_cnt = 0;
+      nr_timer_stop(&tac->T310);
+      int t304_value = nr_rrc_get_T304(reconfigurationWithSync->t304);
+      nr_timer_setup(&tac->T304, t304_value, 10); // 10ms step
+      nr_timer_start(&tac->T304);
       rrc->rnti = reconfigurationWithSync->newUE_Identity;
       // resume suspended radio bearers
       for (int i = 0; i < NR_NUM_SRB; i++) {
@@ -871,16 +856,12 @@ static void nr_rrc_process_rrcsetup(NR_UE_RRC_INST_t *rrc,
   // TODO (not handled) if stored, discard the cell reselection priority information provided by
   // the cellReselectionPriorities or inherited from another RAT
 
-  // stop timer T300, T301 or T319 if running;
+  // stop timer T300, T301, T319, T320 if running;
   NR_UE_Timers_Constants_t *timers = &rrc->timers_and_constants;
-  timers->T300_active = false;
-  timers->T300_cnt = 0;
-  timers->T301_active = false;
-  timers->T301_cnt = 0;
-  timers->T319_active = false;
-  timers->T319_cnt = 0;
-  timers->T320_active = false;
-  timers->T320_cnt = 0;
+  nr_timer_stop(&timers->T300);
+  nr_timer_stop(&timers->T301);
+  nr_timer_stop(&timers->T319);
+  nr_timer_stop(&timers->T320);
 
   // TODO if T390 and T302 are running (not implemented)
 
@@ -1383,10 +1364,9 @@ static int nr_rrc_ue_decode_dcch(NR_UE_RRC_INST_t *rrc,
 void nr_rrc_handle_ra_indication(NR_UE_RRC_INST_t *rrc, bool ra_succeeded)
 {
   NR_UE_Timers_Constants_t *timers = &rrc->timers_and_constants;
-  if (ra_succeeded && timers->T304_active == true) {
+  if (ra_succeeded && is_nr_timer_active(timers->T304)) {
     // successful Random Access procedure triggered by reconfigurationWithSync
-    timers->T304_active = false;
-    timers->T304_cnt = 0;
+    nr_timer_stop(&timers->T304);
     // TODO handle the rest of procedures as described in 5.3.5.3 for when
     // reconfigurationWithSync is included in spCellConfig
   }
@@ -1823,11 +1803,11 @@ void nr_rrc_going_to_IDLE(NR_UE_RRC_INST_t *rrc,
       waitTime = rrcReleaseIEs->nonCriticalExtension ?
                  rrcReleaseIEs->nonCriticalExtension->waitTime : NULL;
       if (waitTime) {
-        if (tac->T302_active)
-          tac->T302_cnt = 0; // stop 302
+        nr_timer_stop(&tac->T302); // stop 302
         // start timer T302 with the value set to the waitTime
-        tac->T302_active = true;
-        tac->T302_k = *waitTime * 1000; // waitTime is in seconds
+        int target = *waitTime * 1000; // waitTime is in seconds
+        nr_timer_setup(&tac->T302, target, 10);
+        nr_timer_start(&tac->T302);
         // TODO inform upper layers that access barring is applicable
         // for all access categories except categories '0' and '2'.
         LOG_E(NR_RRC,"Go to IDLE. Handling RRCRelease message including a waitTime not implemented\n");
@@ -1835,17 +1815,15 @@ void nr_rrc_going_to_IDLE(NR_UE_RRC_INST_t *rrc,
     }
   }
   if (!waitTime) {
-    if (tac->T302_active) {
-      tac->T302_cnt = 0;
-      tac->T302_active = false;
+    if (is_nr_timer_active(tac->T302)) {
+      nr_timer_stop(&tac->T302);
       // TODO barring alleviation as in 5.3.14.4
       // not implemented
       LOG_E(NR_RRC,"Go to IDLE. Barring alleviation not implemented\n");
     }
   }
-  if (tac->T390_active) {
-    tac->T390_cnt = 0;
-    tac->T390_active = false;
+  if (is_nr_timer_active(tac->T390)) {
+    nr_timer_stop(&tac->T390);
     // TODO barring alleviation as in 5.3.14.4
     // not implemented
     LOG_E(NR_RRC,"Go to IDLE. Barring alleviation not implemented\n");
@@ -1853,24 +1831,15 @@ void nr_rrc_going_to_IDLE(NR_UE_RRC_INST_t *rrc,
   if (!RRCRelease && rrc->nrRrcState == RRC_STATE_INACTIVE_NR) {
     // TODO discard the cell reselection priority information provided by the cellReselectionPriorities
     // cell reselection priorities not implemented yet
-    if (tac->T320_active) {
-      tac->T320_cnt = 0;
-      tac->T320_active = false;
-    }
+    nr_timer_stop(&tac->T320);
   }
   // Stop all the timers except T302, T320 and T325
-  tac->T300_active = false;
-  tac->T300_cnt = 0;
-  tac->T301_active = false;
-  tac->T301_cnt = 0;
-  tac->T304_active = false;
-  tac->T304_cnt = 0;
-  tac->T310_active = false;
-  tac->T310_cnt = 0;
-  tac->T311_active = false;
-  tac->T311_cnt = 0;
-  tac->T319_active = false;
-  tac->T319_cnt = 0;
+  nr_timer_stop(&tac->T300);
+  nr_timer_stop(&tac->T301);
+  nr_timer_stop(&tac->T304);
+  nr_timer_stop(&tac->T310);
+  nr_timer_stop(&tac->T311);
+  nr_timer_stop(&tac->T319);
 
   // discard the UE Inactive AS context
   // TODO there is no inactive AS context
@@ -1909,6 +1878,7 @@ void nr_rrc_going_to_IDLE(NR_UE_RRC_INST_t *rrc,
   for (int i = 0; i < NB_CNX_UE; i++) {
     rrcPerNB_t *nb = &rrc->perNB[i];
     NR_UE_RRC_SI_INFO *SI_info = &nb->SInfo;
+    init_SI_timers(SI_info);
     asn1cFreeStruc(asn_DEF_NR_SIB1, SI_info->sib1);
     asn1cFreeStruc(asn_DEF_NR_SIB2, SI_info->sib2);
     asn1cFreeStruc(asn_DEF_NR_SIB3, SI_info->sib3);
diff --git a/openair2/RRC/NR_UE/rrc_defs.h b/openair2/RRC/NR_UE/rrc_defs.h
index 73f2d0827f..9c2ef2a00a 100644
--- a/openair2/RRC/NR_UE/rrc_defs.h
+++ b/openair2/RRC/NR_UE/rrc_defs.h
@@ -114,74 +114,53 @@ typedef enum RA_trigger_e {
 typedef struct UE_RRC_SI_INFO_NR_s {
   uint32_t default_otherSI_map;
   NR_SIB1_t *sib1;
-  int sib1_timer;
+  NR_timer_t sib1_timer;
   NR_SIB2_t *sib2;
-  int sib2_timer;
+  NR_timer_t sib2_timer;
   NR_SIB3_t *sib3;
-  int sib3_timer;
+  NR_timer_t sib3_timer;
   NR_SIB4_t *sib4;
-  int sib4_timer;
+  NR_timer_t sib4_timer;
   NR_SIB5_t *sib5;
-  int sib5_timer;
+  NR_timer_t sib5_timer;
   NR_SIB6_t *sib6;
-  int sib6_timer;
+  NR_timer_t sib6_timer;
   NR_SIB7_t *sib7;
-  int sib7_timer;
+  NR_timer_t sib7_timer;
   NR_SIB8_t *sib8;
-  int sib8_timer;
+  NR_timer_t sib8_timer;
   NR_SIB9_t *sib9;
-  int sib9_timer;
+  NR_timer_t sib9_timer;
   NR_SIB10_r16_t *sib10;
-  int sib10_timer;
+  NR_timer_t sib10_timer;
   NR_SIB11_r16_t *sib11;
-  int sib11_timer;
+  NR_timer_t sib11_timer;
   NR_SIB12_r16_t *sib12;
-  int sib12_timer;
+  NR_timer_t sib12_timer;
   NR_SIB13_r16_t *sib13;
-  int sib13_timer;
+  NR_timer_t sib13_timer;
   NR_SIB14_r16_t *sib14;
-  int sib14_timer;
-} __attribute__ ((__packed__)) NR_UE_RRC_SI_INFO;
+  NR_timer_t sib14_timer;
+} NR_UE_RRC_SI_INFO;
 
 typedef struct NR_UE_Timers_Constants_s {
-  // timers status
-  bool T300_active;
-  bool T301_active;
-  bool T302_active;
-  bool T304_active;
-  bool T310_active;
-  bool T311_active;
-  bool T319_active;
-  bool T320_active;
-  bool T325_active;
-  bool T390_active;
   // timers
-  uint32_t T300_cnt;
-  uint32_t T301_cnt;
-  uint32_t T302_cnt;
-  uint32_t T304_cnt;
-  uint32_t T310_cnt;
-  uint32_t T311_cnt;
-  uint32_t T319_cnt;
-  uint32_t T320_cnt;
-  uint32_t T325_cnt;
-  uint32_t T390_cnt;
+  NR_timer_t T300;
+  NR_timer_t T301;
+  NR_timer_t T302;
+  NR_timer_t T304;
+  NR_timer_t T310;
+  NR_timer_t T311;
+  NR_timer_t T319;
+  NR_timer_t T320;
+  NR_timer_t T325;
+  NR_timer_t T390;
   // counters
   uint32_t N310_cnt;
   uint32_t N311_cnt;
   // constants (limits configured by the network)
   uint32_t N310_k;
   uint32_t N311_k;
-  uint32_t T300_k;
-  uint32_t T301_k;
-  uint32_t T302_k;
-  uint32_t T304_k;
-  uint32_t T310_k;
-  uint32_t T311_k;
-  uint32_t T319_k;
-  uint32_t T320_k;
-  uint32_t T325_k;
-  uint32_t T390_k;
 } NR_UE_Timers_Constants_t;
 
 typedef enum {
diff --git a/openair2/RRC/NR_UE/rrc_proto.h b/openair2/RRC/NR_UE/rrc_proto.h
index 1001652037..45fb1a1c0f 100644
--- a/openair2/RRC/NR_UE/rrc_proto.h
+++ b/openair2/RRC/NR_UE/rrc_proto.h
@@ -33,7 +33,7 @@
 #ifndef _RRC_PROTO_H_
 #define _RRC_PROTO_H_
 
-
+#include "oai_asn1.h"
 #include "rrc_defs.h"
 #include "NR_RRCReconfiguration.h"
 #include "NR_MeasConfig.h"
@@ -108,6 +108,7 @@ extern void start_oai_nrue_threads(void);
 int get_from_lte_ue_fd();
 
 void nr_rrc_SI_timers(NR_UE_RRC_SI_INFO *SInfo);
+void init_SI_timers(NR_UE_RRC_SI_INFO *SInfo);
 
 void nr_ue_rrc_timer_trigger(int module_id, int frame, int gnb_id);
 void handle_t300_expiry(NR_UE_RRC_INST_t *rrc);
@@ -115,9 +116,8 @@ void handle_t300_expiry(NR_UE_RRC_INST_t *rrc);
 void reset_rlf_timers_and_constants(NR_UE_Timers_Constants_t *tac);
 void set_default_timers_and_constants(NR_UE_Timers_Constants_t *tac);
 void nr_rrc_set_sib1_timers_and_constants(NR_UE_Timers_Constants_t *tac, NR_SIB1_t *sib1);
-void nr_rrc_set_T304(NR_UE_Timers_Constants_t *tac, NR_ReconfigurationWithSync_t *reconfigurationWithSync);
-void handle_rlf_sync(NR_UE_Timers_Constants_t *tac,
-                     nr_sync_msg_t sync_msg);
+int nr_rrc_get_T304(long t304);
+void handle_rlf_sync(NR_UE_Timers_Constants_t *tac, nr_sync_msg_t sync_msg);
 void nr_rrc_handle_SetupRelease_RLF_TimersAndConstants(NR_UE_RRC_INST_t *rrc,
                                                        struct NR_SetupRelease_RLF_TimersAndConstants *rlf_TimersAndConstants);
 
diff --git a/openair2/RRC/NR_UE/rrc_timers_and_constants.c b/openair2/RRC/NR_UE/rrc_timers_and_constants.c
index c01755e4de..cd5b79640c 100644
--- a/openair2/RRC/NR_UE/rrc_timers_and_constants.c
+++ b/openair2/RRC/NR_UE/rrc_timers_and_constants.c
@@ -21,80 +21,97 @@
 
 #include "openair2/RRC/NR_UE/rrc_proto.h"
 
-void nr_rrc_SI_timers(NR_UE_RRC_SI_INFO *SInfo)
+void init_SI_timers(NR_UE_RRC_SI_INFO *SInfo)
 {
   // delete any stored version of a SIB after 3 hours
   // from the moment it was successfully confirmed as valid
-  if (SInfo->sib1 && SInfo->sib1_timer >= 0) {
-    SInfo->sib1_timer += 10;
-    if (SInfo->sib1_timer > 10800000)
-      SInfo->sib1_timer = -1;
-  }
-  if (SInfo->sib2 && SInfo->sib2_timer >= 0) {
-    SInfo->sib2_timer += 10;
-    if (SInfo->sib2_timer > 10800000)
-      SInfo->sib2_timer = -1;
-  }
-  if (SInfo->sib3 && SInfo->sib3_timer >= 0) {
-    SInfo->sib3_timer += 10;
-    if (SInfo->sib3_timer > 10800000)
-      SInfo->sib3_timer = -1;
-  }
-  if (SInfo->sib4 && SInfo->sib4_timer >= 0) {
-    SInfo->sib4_timer += 10;
-    if (SInfo->sib4_timer > 10800000)
-      SInfo->sib4_timer = -1;
-  }
-  if (SInfo->sib5 && SInfo->sib5_timer >= 0) {
-    SInfo->sib5_timer += 10;
-    if (SInfo->sib5_timer > 10800000)
-      SInfo->sib5_timer = -1;
-  }
-  if (SInfo->sib6 && SInfo->sib6_timer >= 0) {
-    SInfo->sib6_timer += 10;
-    if (SInfo->sib6_timer > 10800000)
-      SInfo->sib6_timer = -1;
-  }
-  if (SInfo->sib7 && SInfo->sib7_timer >= 0) {
-    SInfo->sib7_timer += 10;
-    if (SInfo->sib7_timer > 10800000)
-      SInfo->sib7_timer = -1;
-  }
-  if (SInfo->sib8 && SInfo->sib8_timer >= 0) {
-    SInfo->sib8_timer += 10;
-    if (SInfo->sib8_timer > 10800000)
-      SInfo->sib8_timer = -1;
-  }
-  if (SInfo->sib9 && SInfo->sib9_timer >= 0) {
-    SInfo->sib9_timer += 10;
-    if (SInfo->sib9_timer > 10800000)
-      SInfo->sib9_timer = -1;
+  nr_timer_setup(&SInfo->sib1_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib2_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib3_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib4_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib5_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib6_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib7_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib8_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib9_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib10_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib11_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib12_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib13_timer, 10800000, 10);
+  nr_timer_setup(&SInfo->sib14_timer, 10800000, 10);
+}
 
+void nr_rrc_SI_timers(NR_UE_RRC_SI_INFO *SInfo)
+{
+  if (SInfo->sib1) {
+   bool sib1_expired = nr_timer_tick(&SInfo->sib1_timer);
+   if (sib1_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB1, SInfo->sib1);
   }
-  if (SInfo->sib10 && SInfo->sib10_timer >= 0) {
-    SInfo->sib10_timer += 10;
-    if (SInfo->sib10_timer > 10800000)
-      SInfo->sib10_timer = -1;
+  if (SInfo->sib2) {
+   bool sib2_expired = nr_timer_tick(&SInfo->sib2_timer);
+   if (sib2_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB2, SInfo->sib2);
   }
-  if (SInfo->sib11 && SInfo->sib11_timer >= 0) {
-    SInfo->sib11_timer += 10;
-    if (SInfo->sib11_timer > 10800000)
-      SInfo->sib11_timer = -1;
+  if (SInfo->sib3) {
+   bool sib3_expired = nr_timer_tick(&SInfo->sib3_timer);
+   if (sib3_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB3, SInfo->sib3);
   }
-  if (SInfo->sib12 && SInfo->sib12_timer >= 0) {
-    SInfo->sib12_timer += 10;
-    if (SInfo->sib12_timer > 10800000)
-      SInfo->sib12_timer = -1;
+  if (SInfo->sib4) {
+   bool sib4_expired = nr_timer_tick(&SInfo->sib4_timer);
+   if (sib4_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB4, SInfo->sib4);
   }
-  if (SInfo->sib13 && SInfo->sib13_timer >= 0) {
-    SInfo->sib13_timer += 10;
-    if (SInfo->sib13_timer > 10800000)
-      SInfo->sib13_timer = -1;
+  if (SInfo->sib5) {
+   bool sib5_expired = nr_timer_tick(&SInfo->sib5_timer);
+   if (sib5_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB5, SInfo->sib5);
   }
-  if (SInfo->sib14 && SInfo->sib14_timer >= 0) {
-    SInfo->sib14_timer += 10;
-    if (SInfo->sib14_timer > 10800000)
-      SInfo->sib14_timer = -1;
+  if (SInfo->sib6) {
+   bool sib6_expired = nr_timer_tick(&SInfo->sib6_timer);
+   if (sib6_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB6, SInfo->sib6);
+  }
+  if (SInfo->sib7) {
+   bool sib7_expired = nr_timer_tick(&SInfo->sib7_timer);
+   if (sib7_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB7, SInfo->sib7);
+  }
+  if (SInfo->sib8) {
+   bool sib8_expired = nr_timer_tick(&SInfo->sib8_timer);
+   if (sib8_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB8, SInfo->sib8);
+  }
+  if (SInfo->sib9) {
+   bool sib9_expired = nr_timer_tick(&SInfo->sib9_timer);
+   if (sib9_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB9, SInfo->sib9);
+  }
+  if (SInfo->sib10) {
+   bool sib10_expired = nr_timer_tick(&SInfo->sib10_timer);
+   if (sib10_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB10_r16, SInfo->sib10);
+  }
+  if (SInfo->sib11) {
+   bool sib11_expired = nr_timer_tick(&SInfo->sib11_timer);
+   if (sib11_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB11_r16, SInfo->sib11);
+  }
+  if (SInfo->sib12) {
+   bool sib12_expired = nr_timer_tick(&SInfo->sib12_timer);
+   if (sib12_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB12_r16, SInfo->sib12);
+  }
+  if (SInfo->sib13) {
+   bool sib13_expired = nr_timer_tick(&SInfo->sib13_timer);
+   if (sib13_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB13_r16, SInfo->sib13);
+  }
+  if (SInfo->sib14) {
+   bool sib14_expired = nr_timer_tick(&SInfo->sib14_timer);
+   if (sib14_expired)
+     asn1cFreeStruc(asn_DEF_NR_SIB14_r16, SInfo->sib14);
   }
 }
 
@@ -102,158 +119,154 @@ void nr_rrc_handle_timers(NR_UE_RRC_INST_t *rrc)
 {
   NR_UE_Timers_Constants_t *timers = &rrc->timers_and_constants;
 
-  if (timers->T300_active == true) {
-    timers->T300_cnt += 10;
-    if(timers->T300_cnt >= timers->T300_k) {
-      timers->T300_active = false;
-      timers->T300_cnt = 0;
-      handle_t300_expiry(rrc);
-    }
+  bool t300_expired = nr_timer_tick(&timers->T300);
+  if(t300_expired)
+    handle_t300_expiry(rrc);
+
+  bool t304_expired = nr_timer_tick(&timers->T304);
+  if(t304_expired) {
+    // TODO
+    // For T304 of MCG, in case of the handover from NR or intra-NR
+    // handover, initiate the RRC re-establishment procedure;
+    // In case of handover to NR, perform the actions defined in the
+    // specifications applicable for the source RAT.
   }
-  if (timers->T304_active == true) {
-    timers->T304_cnt += 10;
-    if(timers->T304_cnt >= timers->T304_k) {
-      // TODO
-      // For T304 of MCG, in case of the handover from NR or intra-NR
-      // handover, initiate the RRC re-establishment procedure;
-      // In case of handover to NR, perform the actions defined in the
-      // specifications applicable for the source RAT.
-    }
+
+  bool t310_expired = nr_timer_tick(&timers->T310);
+  if(t310_expired) {
+    // TODO
+    // handle detection of radio link failure
+    // as described in 5.3.10.3 of 38.331
+    AssertFatal(false, "Radio link failure! Not handled yet!\n");
   }
-  if (timers->T310_active == true) {
-    timers->T310_cnt += 10;
-    if(timers->T310_cnt >= timers->T310_k) {
-      // TODO
-      // handle detection of radio link failure
-      // as described in 5.3.10.3 of 38.331
-      AssertFatal(false, "Radio link failure! Not handled yet!\n");
-    }
-  }
-  if (timers->T311_active == true) {
-    timers->T311_cnt += 10;
-    if(timers->T311_cnt >= timers->T311_k) {
-      // Upon T311 expiry, the UE shall perform the actions upon going to RRC_IDLE
-      // with release cause 'RRC connection failure'
-      nr_rrc_going_to_IDLE(rrc, RRC_CONNECTION_FAILURE, NULL);
-    }
+
+  bool t311_expired = nr_timer_tick(&timers->T311);
+  if(t311_expired) {
+    // Upon T311 expiry, the UE shall perform the actions upon going to RRC_IDLE
+    // with release cause 'RRC connection failure'
+    nr_rrc_going_to_IDLE(rrc, RRC_CONNECTION_FAILURE, NULL);
   }
 }
 
-void nr_rrc_set_T304(NR_UE_Timers_Constants_t *tac, NR_ReconfigurationWithSync_t *reconfigurationWithSync)
+int nr_rrc_get_T304(long t304)
 {
-  if(reconfigurationWithSync) {
-    switch (reconfigurationWithSync->t304) {
-      case NR_ReconfigurationWithSync__t304_ms50 :
-        tac->T304_k = 50;
-        break;
-      case NR_ReconfigurationWithSync__t304_ms100 :
-        tac->T304_k = 100;
-        break;
-      case NR_ReconfigurationWithSync__t304_ms150 :
-        tac->T304_k = 150;
-        break;
-      case NR_ReconfigurationWithSync__t304_ms200 :
-        tac->T304_k = 200;
-        break;
-      case NR_ReconfigurationWithSync__t304_ms500 :
-        tac->T304_k = 500;
-        break;
-      case NR_ReconfigurationWithSync__t304_ms1000 :
-        tac->T304_k = 1000;
-        break;
-      case NR_ReconfigurationWithSync__t304_ms2000 :
-        tac->T304_k = 2000;
-        break;
-      case NR_ReconfigurationWithSync__t304_ms10000 :
-        tac->T304_k = 10000;
-        break;
-      default :
-        AssertFatal(false, "Invalid T304 %ld\n", reconfigurationWithSync->t304);
-    }
+  int target = 0;
+  switch (t304) {
+    case NR_ReconfigurationWithSync__t304_ms50 :
+      target = 50;
+      break;
+    case NR_ReconfigurationWithSync__t304_ms100 :
+      target = 100;
+      break;
+    case NR_ReconfigurationWithSync__t304_ms150 :
+      target = 150;
+      break;
+    case NR_ReconfigurationWithSync__t304_ms200 :
+      target = 200;
+      break;
+    case NR_ReconfigurationWithSync__t304_ms500 :
+      target = 500;
+      break;
+    case NR_ReconfigurationWithSync__t304_ms1000 :
+      target = 1000;
+      break;
+    case NR_ReconfigurationWithSync__t304_ms2000 :
+      target = 2000;
+      break;
+    case NR_ReconfigurationWithSync__t304_ms10000 :
+      target = 10000;
+      break;
+    default :
+      AssertFatal(false, "Invalid T304 %ld\n", t304);
   }
+  return target;
 }
 
 void set_rlf_sib1_timers_and_constants(NR_UE_Timers_Constants_t *tac, NR_SIB1_t *sib1)
 {
   if(sib1 && sib1->ue_TimersAndConstants) {
+    int k = 0;
     switch (sib1->ue_TimersAndConstants->t301) {
       case NR_UE_TimersAndConstants__t301_ms100 :
-        tac->T301_k = 100;
+        k = 100;
         break;
       case NR_UE_TimersAndConstants__t301_ms200 :
-        tac->T301_k = 200;
+        k = 200;
         break;
       case NR_UE_TimersAndConstants__t301_ms300 :
-        tac->T301_k = 300;
+        k = 300;
         break;
       case NR_UE_TimersAndConstants__t301_ms400 :
-        tac->T301_k = 400;
+        k = 400;
         break;
       case NR_UE_TimersAndConstants__t301_ms600 :
-        tac->T301_k = 600;
+        k = 600;
         break;
       case NR_UE_TimersAndConstants__t301_ms1000 :
-        tac->T301_k = 1000;
+        k = 1000;
         break;
       case NR_UE_TimersAndConstants__t301_ms1500 :
-        tac->T301_k = 1500;
+        k = 1500;
         break;
       case NR_UE_TimersAndConstants__t301_ms2000 :
-        tac->T301_k = 2000;
+        k = 2000;
         break;
       default :
         AssertFatal(false, "Invalid T301 %ld\n", sib1->ue_TimersAndConstants->t301);
     }
+    nr_timer_setup(&tac->T301, k, 10); // 10ms step
     switch (sib1->ue_TimersAndConstants->t310) {
       case NR_UE_TimersAndConstants__t310_ms0 :
-        tac->T310_k = 0;
+        k = 0;
         break;
       case NR_UE_TimersAndConstants__t310_ms50 :
-        tac->T310_k = 50;
+        k = 50;
         break;
       case NR_UE_TimersAndConstants__t310_ms100 :
-        tac->T310_k = 100;
+        k = 100;
         break;
       case NR_UE_TimersAndConstants__t310_ms200 :
-        tac->T310_k = 200;
+        k = 200;
         break;
       case NR_UE_TimersAndConstants__t310_ms500 :
-        tac->T310_k = 500;
+        k = 500;
         break;
       case NR_UE_TimersAndConstants__t310_ms1000 :
-        tac->T310_k = 1000;
+        k = 1000;
         break;
       case NR_UE_TimersAndConstants__t310_ms2000 :
-        tac->T310_k = 2000;
+        k = 2000;
         break;
       default :
         AssertFatal(false, "Invalid T310 %ld\n", sib1->ue_TimersAndConstants->t310);
     }
+    nr_timer_setup(&tac->T310, k, 10); // 10ms step
     switch (sib1->ue_TimersAndConstants->t311) {
       case NR_UE_TimersAndConstants__t311_ms1000 :
-        tac->T311_k = 1000;
+        k = 1000;
         break;
       case NR_UE_TimersAndConstants__t311_ms3000 :
-        tac->T311_k = 3000;
+        k = 3000;
         break;
       case NR_UE_TimersAndConstants__t311_ms5000 :
-        tac->T311_k = 5000;
+        k = 5000;
         break;
       case NR_UE_TimersAndConstants__t311_ms10000 :
-        tac->T311_k = 10000;
+        k = 10000;
         break;
       case NR_UE_TimersAndConstants__t311_ms15000 :
-        tac->T311_k = 15000;
+        k = 15000;
         break;
       case NR_UE_TimersAndConstants__t311_ms20000 :
-        tac->T311_k = 20000;
+        k = 20000;
         break;
       case NR_UE_TimersAndConstants__t311_ms30000 :
-        tac->T311_k = 30000;
+        k = 30000;
         break;
       default :
         AssertFatal(false, "Invalid T311 %ld\n", sib1->ue_TimersAndConstants->t311);
     }
+    nr_timer_setup(&tac->T311, k, 10); // 10ms step
     switch (sib1->ue_TimersAndConstants->n310) {
       case NR_UE_TimersAndConstants__n310_n1 :
         tac->N310_k = 1;
@@ -319,62 +332,65 @@ void nr_rrc_set_sib1_timers_and_constants(NR_UE_Timers_Constants_t *tac, NR_SIB1
 {
   set_rlf_sib1_timers_and_constants(tac, sib1);
   if(sib1 && sib1->ue_TimersAndConstants) {
+    int k = 0;
     switch (sib1->ue_TimersAndConstants->t300) {
       case NR_UE_TimersAndConstants__t300_ms100 :
-        tac->T300_k = 100;
+        k = 100;
         break;
       case NR_UE_TimersAndConstants__t300_ms200 :
-        tac->T300_k = 200;
+        k = 200;
         break;
       case NR_UE_TimersAndConstants__t300_ms300 :
-        tac->T300_k = 300;
+        k = 300;
         break;
       case NR_UE_TimersAndConstants__t300_ms400 :
-        tac->T300_k = 400;
+        k = 400;
         break;
       case NR_UE_TimersAndConstants__t300_ms600 :
-        tac->T300_k = 600;
+        k = 600;
         break;
       case NR_UE_TimersAndConstants__t300_ms1000 :
-        tac->T300_k = 1000;
+        k = 1000;
         break;
       case NR_UE_TimersAndConstants__t300_ms1500 :
-        tac->T300_k = 1500;
+        k = 1500;
         break;
       case NR_UE_TimersAndConstants__t300_ms2000 :
-        tac->T300_k = 2000;
+        k = 2000;
         break;
       default :
         AssertFatal(false, "Invalid T300 %ld\n", sib1->ue_TimersAndConstants->t300);
     }
+    nr_timer_setup(&tac->T300, k, 10); // 10ms step
     switch (sib1->ue_TimersAndConstants->t319) {
       case NR_UE_TimersAndConstants__t319_ms100 :
-        tac->T319_k = 100;
+        k = 100;
         break;
       case NR_UE_TimersAndConstants__t319_ms200 :
-        tac->T319_k = 200;
+        k = 200;
         break;
       case NR_UE_TimersAndConstants__t319_ms300 :
-        tac->T319_k = 300;
+        k = 300;
         break;
       case NR_UE_TimersAndConstants__t319_ms400 :
-        tac->T319_k = 400;
+        k = 400;
         break;
       case NR_UE_TimersAndConstants__t319_ms600 :
-        tac->T319_k = 600;
+        k = 600;
         break;
       case NR_UE_TimersAndConstants__t319_ms1000 :
-        tac->T319_k = 1000;
+        k = 1000;
         break;
       case NR_UE_TimersAndConstants__t319_ms1500 :
-        tac->T319_k = 1500;
+        k = 1500;
         break;
       case NR_UE_TimersAndConstants__t319_ms2000 :
-        tac->T319_k = 2000;
+        k = 2000;
         break;
       default :
         AssertFatal(false, "Invalid T319 %ld\n", sib1->ue_TimersAndConstants->t319);
     }
+    nr_timer_setup(&tac->T319, k, 10); // 10ms step
   }
   else
     LOG_E(NR_RRC,"SIB1 should not be NULL and neither UE_Timers_Constants\n");
@@ -398,37 +414,39 @@ void nr_rrc_handle_SetupRelease_RLF_TimersAndConstants(NR_UE_RRC_INST_t *rrc,
       if (rlf_tac == NULL)
         return;
       // (re-)configure the value of timers and constants in accordance with received rlf-TimersAndConstants
+      int k = 0;
       switch (rlf_tac->t310) {
         case NR_RLF_TimersAndConstants__t310_ms0 :
-          tac->T310_k = 0;
+          k = 0;
           break;
         case NR_RLF_TimersAndConstants__t310_ms50 :
-          tac->T310_k = 50;
+          k = 50;
           break;
         case NR_RLF_TimersAndConstants__t310_ms100 :
-          tac->T310_k = 100;
+          k = 100;
           break;
         case NR_RLF_TimersAndConstants__t310_ms200 :
-          tac->T310_k = 200;
+          k = 200;
           break;
         case NR_RLF_TimersAndConstants__t310_ms500 :
-          tac->T310_k = 500;
+          k = 500;
           break;
         case NR_RLF_TimersAndConstants__t310_ms1000 :
-          tac->T310_k = 1000;
+          k = 1000;
           break;
         case NR_RLF_TimersAndConstants__t310_ms2000 :
-          tac->T310_k = 2000;
+          k = 2000;
           break;
         case NR_RLF_TimersAndConstants__t310_ms4000 :
-          tac->T310_k = 4000;
+          k = 4000;
           break;
         case NR_RLF_TimersAndConstants__t310_ms6000 :
-          tac->T310_k = 6000;
+          k = 6000;
           break;
         default :
           AssertFatal(false, "Invalid T310 %ld\n", rlf_tac->t310);
       }
+      nr_timer_setup(&tac->T310, k, 10); // 10ms step
       switch (rlf_tac->n310) {
         case NR_RLF_TimersAndConstants__n310_n1 :
           tac->N310_k = 1;
@@ -488,29 +506,30 @@ void nr_rrc_handle_SetupRelease_RLF_TimersAndConstants(NR_UE_RRC_INST_t *rrc,
       if (rlf_tac->ext1) {
         switch (rlf_tac->ext1->t311) {
           case NR_RLF_TimersAndConstants__ext1__t311_ms1000 :
-            tac->T311_k = 1000;
+            k = 1000;
             break;
           case NR_RLF_TimersAndConstants__ext1__t311_ms3000 :
-            tac->T311_k = 3000;
+            k = 3000;
             break;
           case NR_RLF_TimersAndConstants__ext1__t311_ms5000 :
-            tac->T311_k = 5000;
+            k = 5000;
             break;
           case NR_RLF_TimersAndConstants__ext1__t311_ms10000 :
-            tac->T311_k = 10000;
+            k = 10000;
             break;
           case NR_RLF_TimersAndConstants__ext1__t311_ms15000 :
-            tac->T311_k = 15000;
+            k = 15000;
             break;
           case NR_RLF_TimersAndConstants__ext1__t311_ms20000 :
-            tac->T311_k = 20000;
+            k = 20000;
             break;
           case NR_RLF_TimersAndConstants__ext1__t311_ms30000 :
-            tac->T311_k = 30000;
+            k = 30000;
             break;
           default :
             AssertFatal(false, "Invalid T311 %ld\n", rlf_tac->ext1->t311);
         }
+        nr_timer_setup(&tac->T311, k, 10); // 10ms step
       }
       reset_rlf_timers_and_constants(tac);
       break;
@@ -524,13 +543,12 @@ void handle_rlf_sync(NR_UE_Timers_Constants_t *tac,
 {
   if (sync_msg == IN_SYNC) {
     tac->N310_cnt = 0;
-    if (tac->T310_active) {
+    if (is_nr_timer_active(tac->T310)) {
       tac->N311_cnt++;
       // Upon receiving N311 consecutive "in-sync" indications
       if (tac->N311_cnt >= tac->N311_k) {
         // stop timer T310
-        tac->T310_active = false;
-        tac->T310_cnt = 0;
+        nr_timer_stop(&tac->T310);
         tac->N311_cnt = 0;
       }
     }
@@ -538,20 +556,19 @@ void handle_rlf_sync(NR_UE_Timers_Constants_t *tac,
   else {
     // OUT_OF_SYNC
     tac->N311_cnt = 0;
-    if(tac->T300_active ||
-       tac->T301_active ||
-       tac->T304_active ||
-       tac->T310_active ||
-       tac->T311_active ||
-       tac->T319_active)
+    if(is_nr_timer_active(tac->T300) ||
+       is_nr_timer_active(tac->T301) ||
+       is_nr_timer_active(tac->T304) ||
+       is_nr_timer_active(tac->T310) ||
+       is_nr_timer_active(tac->T311) ||
+       is_nr_timer_active(tac->T319))
       return;
     tac->N310_cnt++;
     // upon receiving N310 consecutive "out-of-sync" indications
     if (tac->N310_cnt >= tac->N310_k) {
       // start timer T310
-        tac->T310_active = true;
-        tac->T310_cnt = 0;
-        tac->N310_cnt = 0;
+      nr_timer_start(&tac->T310);
+      tac->N310_cnt = 0;
     }
   }
 }
@@ -559,17 +576,16 @@ void handle_rlf_sync(NR_UE_Timers_Constants_t *tac,
 void set_default_timers_and_constants(NR_UE_Timers_Constants_t *tac)
 {
   // 38.331 9.2.3 Default values timers and constants
-  tac->T310_k = 1000;
+  nr_timer_setup(&tac->T310, 1000, 10); // 10ms step
+  nr_timer_setup(&tac->T310, 30000, 10); // 10ms step
   tac->N310_k = 1;
-  tac->T311_k = 30000;
   tac->N311_k = 1;
 }
 
 void reset_rlf_timers_and_constants(NR_UE_Timers_Constants_t *tac)
 {
   // stop timer T310 for this cell group, if running
-  tac->T310_active = false;
-  tac->T310_cnt = 0;
+  nr_timer_stop(&tac->T310);
   // reset the counters N310 and N311
   tac->N310_cnt = 0;
   tac->N311_cnt = 0;