diff --git a/openair2/ENB_APP/flexran_agent_ran_api.c b/openair2/ENB_APP/flexran_agent_ran_api.c
index 97a77a634c..b81d030c43 100644
--- a/openair2/ENB_APP/flexran_agent_ran_api.c
+++ b/openair2/ENB_APP/flexran_agent_ran_api.c
@@ -889,6 +889,17 @@ int flexran_get_ue_transmission_antenna(mid_t mod_id, mid_t ue_id)
   }
 }
 
+uint64_t flexran_get_ue_imsi(mid_t mod_id, mid_t ue_id)
+{
+  if (!rrc_is_present(mod_id)) return -1;
+
+  rnti_t rnti = flexran_get_ue_crnti(mod_id,ue_id);
+  struct rrc_eNB_ue_context_s* ue_context_p = rrc_eNB_get_ue_context(RC.rrc[mod_id], rnti);
+
+  if (!ue_context_p) return -1;
+  return ue_context_p->ue_context.imsi;
+}
+
 long flexran_get_lcg(mid_t mod_id, mid_t ue_id, mid_t lc_id)
 {
   if (!mac_is_present(mod_id)) return 0;
diff --git a/openair2/ENB_APP/flexran_agent_ran_api.h b/openair2/ENB_APP/flexran_agent_ran_api.h
index b3515c9c6c..aafb82077e 100644
--- a/openair2/ENB_APP/flexran_agent_ran_api.h
+++ b/openair2/ENB_APP/flexran_agent_ran_api.h
@@ -301,6 +301,9 @@ long flexran_get_extended_bsr_size(mid_t mod_id, mid_t ue_id);
 /* Get number of UE transmission antennas */
 int flexran_get_ue_transmission_antenna(mid_t mod_id, mid_t ue_id);
 
+/* Get the IMSI of UE */
+uint64_t flexran_get_ue_imsi(mid_t mod_id, mid_t ue_id);
+
 /* Get logical channel group of a channel with id lc_id */
 long flexran_get_lcg(mid_t mod_id, mid_t ue_id, mid_t lc_id);
 
diff --git a/openair2/RRC/LITE/defs.h b/openair2/RRC/LITE/defs.h
index 9a9840273b..763a55c559 100644
--- a/openair2/RRC/LITE/defs.h
+++ b/openair2/RRC/LITE/defs.h
@@ -394,7 +394,8 @@ typedef struct eNB_RRC_UE_s {
   MeasResults_t*                     measResults;
 
   UE_EUTRA_Capability_t*             UE_Capability;
-  
+  uint64_t                           imsi;
+
 #if defined(ENABLE_SECURITY)
   /* KeNB as derived from KASME received from EPC */
   uint8_t kenb[32];
diff --git a/openair2/RRC/LITE/rrc_eNB_S1AP.c b/openair2/RRC/LITE/rrc_eNB_S1AP.c
index a2c570c009..87bbe8857d 100644
--- a/openair2/RRC/LITE/rrc_eNB_S1AP.c
+++ b/openair2/RRC/LITE/rrc_eNB_S1AP.c
@@ -86,8 +86,25 @@ static const uint16_t S1AP_INTEGRITY_EIA2_MASK = 0x4000;
 #endif
 #endif
 
-
-
+uint64_t compute_imsi(ImsiMobileIdentity_t *id) {
+  uint64_t imsi;
+  imsi  = id->digit15;
+  imsi += id->digit14 * 10;               // pow(10, 1)
+  imsi += id->digit13 * 100;              // pow(10, 2)
+  imsi += id->digit12 * 1000;             // pow(10, 3)
+  imsi += id->digit11 * 10000;            // pow(10, 4)
+  imsi += id->digit10 * 100000;           // pow(10, 5)
+  imsi += id->digit9  * 1000000;          // pow(10, 6)
+  imsi += id->digit8  * 10000000;         // pow(10, 7)
+  imsi += id->digit7  * 100000000;        // pow(10, 8)
+  imsi += id->digit6  * 1000000000;       // pow(10, 9)
+  imsi += id->digit5  * 10000000000;      // pow(10, 10)
+  imsi += id->digit4  * 100000000000;     // pow(10, 11)
+  imsi += id->digit3  * 1000000000000;    // pow(10, 12)
+  imsi += id->digit2  * 10000000000000;   // pow(10, 13)
+  imsi += id->digit1  * 100000000000000;  // pow(10, 14)
+  return imsi;
+}
 
 # if defined(ENABLE_ITTI)
 //------------------------------------------------------------------------------