diff --git a/src/lte/model/pf-ff-mac-scheduler.h b/src/lte/model/pf-ff-mac-scheduler.h
index 5456bd844..9c665e047 100644
--- a/src/lte/model/pf-ff-mac-scheduler.h
+++ b/src/lte/model/pf-ff-mac-scheduler.h
@@ -37,7 +37,7 @@
 
 
 #define HARQ_PROC_NUM 8
-#define HARQ_DL_TIMEOUT 8
+#define HARQ_DL_TIMEOUT 11
 
 namespace ns3 {
 
diff --git a/src/lte/model/rr-ff-mac-scheduler.cc b/src/lte/model/rr-ff-mac-scheduler.cc
index ac30c7539..e871724e0 100644
--- a/src/lte/model/rr-ff-mac-scheduler.cc
+++ b/src/lte/model/rr-ff-mac-scheduler.cc
@@ -1472,6 +1472,7 @@ RrFfMacScheduler::DoSchedUlTriggerReq (const struct FfMacSchedSapProvider::Sched
                   // restart from the first
                   it = m_ceBsrRxed.begin ();
                 }
+              NS_LOG_DEBUG (this << " CQI = 0");
               continue; // CQI == 0 means "out of range" (see table 7.2.3-1 of 36.213)
             }
           uldci.m_mcs = m_amc->GetMcsFromCqi (cqi);
diff --git a/src/lte/model/rr-ff-mac-scheduler.h b/src/lte/model/rr-ff-mac-scheduler.h
index 7d3fb6212..80870b560 100644
--- a/src/lte/model/rr-ff-mac-scheduler.h
+++ b/src/lte/model/rr-ff-mac-scheduler.h
@@ -31,7 +31,7 @@
 #include <ns3/lte-amc.h>
 
 #define HARQ_PROC_NUM 8
-#define HARQ_DL_TIMEOUT 8
+#define HARQ_DL_TIMEOUT 11
 
 namespace ns3 {