diff --git a/lib/include/srslte/phy/common/timestamp.h b/lib/include/srslte/phy/common/timestamp.h
index 266520975..c64e50331 100644
--- a/lib/include/srslte/phy/common/timestamp.h
+++ b/lib/include/srslte/phy/common/timestamp.h
@@ -58,7 +58,7 @@ SRSLTE_API int srslte_timestamp_add(srslte_timestamp_t* t, time_t full_secs, dou
 
 SRSLTE_API int srslte_timestamp_sub(srslte_timestamp_t* t, time_t full_secs, double frac_secs);
 
-SRSLTE_API double srslte_timestamp_real(srslte_timestamp_t* t);
+SRSLTE_API double srslte_timestamp_real(const srslte_timestamp_t* t);
 
 SRSLTE_API bool srslte_timestamp_iszero(const srslte_timestamp_t* t);
 
diff --git a/lib/src/phy/channel/rlf.c b/lib/src/phy/channel/rlf.c
index 422da8d71..0b30392b2 100644
--- a/lib/src/phy/channel/rlf.c
+++ b/lib/src/phy/channel/rlf.c
@@ -34,11 +34,19 @@ void srslte_channel_rlf_execute(srslte_channel_rlf_t*     q,
                                 uint32_t                  nsamples,
                                 const srslte_timestamp_t* ts)
 {
-  uint32_t period_ms    = q->t_on_ms + q->t_off_ms;
-  double   full_secs_ms = (ts->full_secs * 1000) % period_ms;
-  double   frac_secs_ms = (ts->frac_secs * 1000);
-  double   time_ms      = full_secs_ms + frac_secs_ms;
+  // Caulculate full period in MS
+  uint64_t period_ms = q->t_on_ms + q->t_off_ms;
 
+  // Convert seconds to ms and reduce it into 32 bit
+  uint32_t full_secs_ms = (uint32_t)((ts->full_secs * 1000UL) % period_ms);
+
+  // Convert Fractional seconds into ms and convert it to integer
+  uint32_t frac_secs_ms = (uint32_t)round(ts->frac_secs * 1000);
+
+  // Add full seconds and fractional performing period module
+  uint32_t time_ms = (full_secs_ms + frac_secs_ms) % period_ms;
+
+  // Decide whether enables or disables channel
   if (time_ms < q->t_on_ms) {
     srslte_vec_sc_prod_cfc(in, 1.0f, out, nsamples);
   } else {
@@ -49,4 +57,4 @@ void srslte_channel_rlf_execute(srslte_channel_rlf_t*     q,
 void srslte_channel_rlf_free(srslte_channel_rlf_t* q)
 {
   // Do nothing
-}
\ No newline at end of file
+}
diff --git a/lib/src/phy/common/timestamp.c b/lib/src/phy/common/timestamp.c
index 0e750dc27..44694b1d8 100644
--- a/lib/src/phy/common/timestamp.c
+++ b/lib/src/phy/common/timestamp.c
@@ -103,7 +103,7 @@ int srslte_timestamp_sub(srslte_timestamp_t* t, time_t full_secs, double frac_se
   return ret;
 }
 
-double srslte_timestamp_real(srslte_timestamp_t* t)
+double srslte_timestamp_real(const srslte_timestamp_t* t)
 {
   return t->frac_secs + t->full_secs;
 }