# HG changeset patch
# Parent e15adc7172f1ca13a843d98102022e035f6ee671
# User Mirko Banchi <mk.banchi@gmail.com>
# Date 1280188182 -7200

Resolves bug 842 about the incorrect value of blockAckDuration field

diff --git a/src/devices/wifi/edca-txop-n.cc b/src/devices/wifi/edca-txop-n.cc
--- a/src/devices/wifi/edca-txop-n.cc
+++ b/src/devices/wifi/edca-txop-n.cc
@@ -33,7 +33,6 @@
 #include "msdu-aggregator.h"
 #include "mgt-headers.h"
 #include "qos-blocked-destinations.h"
-#include "block-ack-manager.h"
 
 NS_LOG_COMPONENT_DEFINE ("EdcaTxopN");
 
@@ -320,10 +319,9 @@
           NS_LOG_DEBUG ("queue is empty");
           return; 
         }
-      struct Bar bar;
-      if (m_baManager->HasBar (bar))
+      if (m_baManager->HasBar (m_currentBar))
         {
-          SendBlockAckRequest (bar);
+          SendBlockAckRequest (m_currentBar);
           return;
         }
       /* check if packets need retransmission are stored in BlockAckManager */
@@ -378,6 +376,10 @@
       StartAccessIfNeeded ();
       NS_LOG_DEBUG ("tx broadcast");
     }
+  else if (m_currentHdr.GetType() == WIFI_MAC_CTL_BACKREQ)
+    {
+      SendBlockAckRequest (m_currentBar);
+    }
   else
     {
       if (m_currentHdr.IsQosData () && m_currentHdr.IsQosBlockAck ())
diff --git a/src/devices/wifi/edca-txop-n.h b/src/devices/wifi/edca-txop-n.h
--- a/src/devices/wifi/edca-txop-n.h
+++ b/src/devices/wifi/edca-txop-n.h
@@ -32,6 +32,7 @@
 #include "qos-utils.h"
 #include "dcf.h"
 #include "ctrl-headers.h"
+#include "block-ack-manager.h"
 
 #include <map>
 #include <list>
@@ -221,6 +222,7 @@
   enum BlockAckType m_blockAckType;
   Time m_currentPacketTimestamp;
   uint16_t m_blockAckInactivityTimeout;
+  struct Bar m_currentBar;
 };
 
 }  //namespace ns3