diff --git a/openair2/LAYER2/NR_MAC_UE/config_ue.c b/openair2/LAYER2/NR_MAC_UE/config_ue.c
index 07d8ed4513..cc450cc4c0 100644
--- a/openair2/LAYER2/NR_MAC_UE/config_ue.c
+++ b/openair2/LAYER2/NR_MAC_UE/config_ue.c
@@ -1691,6 +1691,7 @@ static uint32_t nr_get_sf_periodicBSRTimer(long periodicBSR)
 static void configure_maccellgroup(NR_UE_MAC_INST_t *mac, const NR_MAC_CellGroupConfig_t *mcg)
 {
   NR_UE_SCHEDULING_INFO *si = &mac->scheduling_info;
+  int scs = mac->current_UL_BWP->scs;
   if (mcg->drx_Config)
     LOG_E(NR_MAC, "DRX not implemented! Configuration not handled!\n");
   if (mcg->schedulingRequestConfig) {
@@ -1699,8 +1700,7 @@ static void configure_maccellgroup(NR_UE_MAC_INST_t *mac, const NR_MAC_CellGroup
       for (int i = 0; i < src->schedulingRequestToReleaseList->list.count; i++) {
         if (*src->schedulingRequestToReleaseList->list.array[i] == si->sr_id) {
           si->SR_COUNTER = 0;
-          si->sr_ProhibitTimer = 0;
-          si->sr_ProhibitTimer_Running = 0;
+          nr_timer_setup(&si->sr_ProhibitTimer, 0, 1); // default value is 0ms
           si->sr_id = -1; // invalid init value
         }
         else
@@ -1715,13 +1715,16 @@ static void configure_maccellgroup(NR_UE_MAC_INST_t *mac, const NR_MAC_CellGroup
                     "Current implementation cannot handle more than 1 SR configuration\n");
         si->sr_id = sr->schedulingRequestId;
         si->sr_TransMax = sr->sr_TransMax;
+        int target_ms = 0;
         if (sr->sr_ProhibitTimer)
-          LOG_E(NR_MAC, "SR prohibit timer not properly implemented\n");
+          target_ms = 1 << *sr->sr_ProhibitTimer;
+        // length of slot is (1/2^scs)ms
+        nr_timer_setup(&si->sr_ProhibitTimer, target_ms << scs, 1); // 1 slot update rate
       }
     }
   }
   if (mcg->bsr_Config) {
-    int subframes_per_slot = nr_slots_per_frame[mac->current_UL_BWP->scs] / 10;
+    int subframes_per_slot = nr_slots_per_frame[scs] / 10;
     uint32_t periodic_sf = nr_get_sf_periodicBSRTimer(mcg->bsr_Config->periodicBSR_Timer);
     uint32_t target = periodic_sf < UINT_MAX ? periodic_sf * subframes_per_slot : periodic_sf;
     nr_timer_setup(&si->periodicBSR_Timer, target, 1); // 1 slot update rate
diff --git a/openair2/LAYER2/NR_MAC_UE/mac_defs.h b/openair2/LAYER2/NR_MAC_UE/mac_defs.h
index 4a79b6e38d..5990b4aecc 100644
--- a/openair2/LAYER2/NR_MAC_UE/mac_defs.h
+++ b/openair2/LAYER2/NR_MAC_UE/mac_defs.h
@@ -222,10 +222,8 @@ typedef struct {
   NR_timer_t retxBSR_Timer;
   /// periodicBSR-Timer
   NR_timer_t periodicBSR_Timer;
-  /// default value is 0: not configured
-  uint16_t sr_ProhibitTimer;
-  /// sr ProhibitTime running
-  uint8_t sr_ProhibitTimer_Running;
+  /// sr ProhibitTimer
+  NR_timer_t sr_ProhibitTimer;
   // Maximum number of SR transmissions
   uint32_t sr_TransMax;
   int sr_id;
diff --git a/openair2/LAYER2/NR_MAC_UE/main_ue_nr.c b/openair2/LAYER2/NR_MAC_UE/main_ue_nr.c
index a7185ee7d2..2db6f69c09 100644
--- a/openair2/LAYER2/NR_MAC_UE/main_ue_nr.c
+++ b/openair2/LAYER2/NR_MAC_UE/main_ue_nr.c
@@ -165,6 +165,7 @@ void reset_mac_inst(NR_UE_MAC_INST_t *nr_mac)
   }
   nr_timer_stop(&nr_mac->ra.contention_resolution_timer);
   nr_timer_stop(&nr_mac->scheduling_info.sr_DelayTimer);
+  nr_timer_stop(&nr_mac->scheduling_info.sr_ProhibitTimer);
   nr_timer_stop(&nr_mac->scheduling_info.retxBSR_Timer);
 
   // consider all timeAlignmentTimers as expired and perform the corresponding actions in clause 5.2
@@ -187,8 +188,6 @@ void reset_mac_inst(NR_UE_MAC_INST_t *nr_mac)
   // cancel any triggered Scheduling Request procedure
   nr_mac->scheduling_info.SR_COUNTER = 0;
   nr_mac->scheduling_info.SR_pending = 0;
-  nr_mac->scheduling_info.sr_ProhibitTimer = 0;
-  nr_mac->scheduling_info.sr_ProhibitTimer_Running = 0;
   nr_mac->scheduling_info.sr_id = -1; // invalid init value
 
   // cancel any triggered Buffer Status Reporting procedure
diff --git a/openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c b/openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c
index 5520c49315..4a910761be 100644
--- a/openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c
+++ b/openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c
@@ -2504,14 +2504,8 @@ int8_t nr_ue_get_SR(NR_UE_MAC_INST_t *mac, frame_t frameP, slot_t slot)
           si->SR_pending); // todo
     si->SR_COUNTER++;
 
-    // start the sr-prohibittimer : rel 9 and above
-    if (si->sr_ProhibitTimer > 0) { // timer configured
-      si->sr_ProhibitTimer--;
-      si->sr_ProhibitTimer_Running = 1;
-    } else {
-      si->sr_ProhibitTimer_Running = 0;
-    }
-    //mac->ul_active =1;
+    // start the sr-prohibittimer
+    nr_timer_start(&si->sr_ProhibitTimer);
     return (1);   //instruct phy to signal SR
   } else {
     // notify RRC to relase PUCCH/SRS
@@ -2526,6 +2520,7 @@ int8_t nr_ue_get_SR(NR_UE_MAC_INST_t *mac, frame_t frameP, slot_t slot)
     }
     si->SR_pending = 0;
     si->SR_COUNTER = 0;
+    nr_timer_stop(&si->sr_ProhibitTimer);
     return (0);
   }
 }
diff --git a/openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c b/openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c
index 1e92d08344..69a98d22ae 100644
--- a/openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c
+++ b/openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c
@@ -133,6 +133,7 @@ static void trigger_regular_bsr(NR_UE_MAC_INST_t *mac, NR_LogicalChannelIdentity
 void update_mac_timers(NR_UE_MAC_INST_t *mac)
 {
   nr_timer_tick(&mac->ra.contention_resolution_timer);
+  nr_timer_tick(&mac->scheduling_info.sr_ProhibitTimer);
   nr_timer_tick(&mac->scheduling_info.sr_DelayTimer);
   bool retxBSR_expired = nr_timer_tick(&mac->scheduling_info.retxBSR_Timer);
   if (retxBSR_expired) {
@@ -2678,6 +2679,7 @@ static void nr_ue_get_sdu_mac_ce_post(NR_UE_MAC_INST_t *mac,
   LOG_D(NR_MAC, "[UE %d][SR] Gave SDU to PHY, clearing any scheduling request\n", mac->ue_id);
   sched_info->SR_pending = 0;
   sched_info->SR_COUNTER = 0;
+  nr_timer_stop(&sched_info->sr_ProhibitTimer);
 
   /* Actions when a BSR is sent */
   if (mac_ce_p->bsr_ce_len) {