diff --git a/openair2/RRC/NR_UE/rrc_UE.c b/openair2/RRC/NR_UE/rrc_UE.c
index f60e19d156..29e4279a84 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
@@ -309,12 +308,14 @@ NR_UE_RRC_INST_t* nr_rrc_init_ue(char* uecap_file, int nb_inst)
     rrc->dl_bwp_id = 0;
     rrc->ul_bwp_id = 0;
     rrc->as_security_activated = false;
-
     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++)
@@ -335,57 +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);
   }
@@ -395,8 +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) {
@@ -472,91 +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;
@@ -686,7 +673,7 @@ 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);
         // FIXME: improve condition for the RA trigger
         if (rrc->nrRrcState == RRC_STATE_IDLE_NR) {
           LOG_D(PHY,"Setting state to RRC_STATE_IDLE_NR\n");
@@ -1896,6 +1883,7 @@ 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 53c6ed1b22..0ed9d1a041 100644
--- a/openair2/RRC/NR_UE/rrc_defs.h
+++ b/openair2/RRC/NR_UE/rrc_defs.h
@@ -114,34 +114,34 @@ 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
diff --git a/openair2/RRC/NR_UE/rrc_proto.h b/openair2/RRC/NR_UE/rrc_proto.h
index 7bd3e076a8..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);
diff --git a/openair2/RRC/NR_UE/rrc_timers_and_constants.c b/openair2/RRC/NR_UE/rrc_timers_and_constants.c
index 9c02e205a2..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);
   }
 }