diff --git a/examples/wireless/inet-wireless-udp.cc b/examples/wireless/inet-wireless-udp.cc
new file mode 100644
index 0000000..25f9280
--- /dev/null
+++ b/examples/wireless/inet-wireless-udp.cc
@@ -0,0 +1,239 @@
+#include "ns3/core-module.h"
+#include "ns3/network-module.h"
+#include "ns3/applications-module.h"
+#include "ns3/wifi-module.h"
+#include "ns3/mobility-module.h"
+#include "ns3/ipv4-global-routing-helper.h"
+#include "ns3/internet-module.h"
+
+using namespace ns3;
+
+NS_LOG_COMPONENT_DEFINE("inet-wireless-udp");
+
+static int lastSeq = -1;
+static int lastAC = 5;
+static const char *AC[] = {"AC_BE", "AC_BK", "AC_VI", "AC_VO", "AC_BE_NQOS", "NA"};
+
+void TagMarker(uint8_t tid, Ptr<const Packet> packet)
+{
+    QosTag qosTag;
+    qosTag.SetTid(tid);
+    packet->AddPacketTag(qosTag);
+}
+
+void PhyTxTrace(std::string context, Ptr<const Packet> packet, WifiMode mode, WifiPreamble preamble, uint8_t txPower)
+{
+    lastSeq = -1;
+    lastAC = 5;
+    PacketMetadata::ItemIterator i = packet->BeginItem();
+    while (i.HasNext()) {
+        PacketMetadata::Item item = i.Next();
+        if (!item.isFragment && item.type == PacketMetadata::Item::HEADER) {
+            if (item.tid == SeqTsHeader::GetTypeId()) {
+                SeqTsHeader header;
+                header.Deserialize(item.current);
+                lastSeq = header.GetSeq();
+            }
+            else if (item.tid == WifiMacHeader::GetTypeId()) {
+                WifiMacHeader header;
+                header.Deserialize(item.current);
+                if (header.IsQosData())
+                    lastAC = QosUtilsMapTidToAc(header.GetQosTid());
+                else
+                    lastAC = 5;
+            }
+        }
+    }
+}
+
+void PhyStateTrace(std::string context, Time start, Time duration, enum WifiPhy::State state)
+{
+    if (state == WifiPhy::TX)
+        std::cout << "TX: node = " << context.at(10) << ", ac = " << AC[lastAC] << ", seq = " << lastSeq << ", start = " << start.GetPicoSeconds() << ", duration = " << duration.GetPicoSeconds() << std::endl;
+}
+
+void PopulateArpCache()
+{
+    Ptr<ArpCache> arp = CreateObject<ArpCache>();
+    arp->SetAliveTimeout(Seconds(3600 * 24 * 365));
+    for (NodeList::Iterator i = NodeList::Begin(); i != NodeList::End(); ++i) {
+        Ptr<Ipv4L3Protocol> ip = (*i)->GetObject<Ipv4L3Protocol>();
+        NS_ASSERT(ip != 0);
+        ObjectVectorValue interfaces;
+        ip->GetAttribute("InterfaceList", interfaces);
+        for (ObjectVectorValue::Iterator j = interfaces.Begin(); j != interfaces.End(); j++) {
+            Ptr<Ipv4Interface> ipIface = StaticCast<Ipv4Interface, Object>((*j).second);
+            NS_ASSERT(ipIface != 0);
+            Ptr<NetDevice> device = ipIface->GetDevice();
+            NS_ASSERT(device != 0);
+            Mac48Address addr = Mac48Address::ConvertFrom(device->GetAddress());
+            for (uint32_t k = 0; k < ipIface->GetNAddresses(); k++) {
+                Ipv4Address ipAddr = ipIface->GetAddress(k).GetLocal();
+                if (ipAddr == Ipv4Address::GetLoopback())
+                    continue;
+                ArpCache::Entry * entry = arp->Add(ipAddr);
+                entry->SetMacAddresss(addr);
+                entry->MarkPermanent();
+                std::cout << "Added ARP cache entry, ip = " << ipAddr << ", mac = " << addr << std::endl;
+            }
+        }
+    }
+    for (NodeList::Iterator i = NodeList::Begin(); i != NodeList::End(); ++i) {
+        Ptr<Ipv4L3Protocol> ip = (*i)->GetObject<Ipv4L3Protocol>();
+        NS_ASSERT(ip != 0);
+        ObjectVectorValue interfaces;
+        ip->GetAttribute("InterfaceList", interfaces);
+        for (ObjectVectorValue::Iterator j = interfaces.Begin(); j != interfaces.End(); j++) {
+            Ptr<Ipv4Interface> ipIface = StaticCast<Ipv4Interface, Object>((*j).second);
+            ipIface->SetAttribute("ArpCache", PointerValue(arp));
+        }
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    Time::SetResolution(Time::PS);
+    Packet::EnableChecking();
+
+    // parameters
+    int numClients = 1;
+    double simulationTime = 1.0; //seconds
+    uint32_t messageLength = 1000; //byte
+    double sendInterval = 0.0001; //seconds
+    double cliAppStartTime = 0.5; //seconds
+    double cliAppStartDelta = 0.001; //seconds
+    double serverYPos = 3000;
+    bool qosEnabled = false;
+    int numApps = 1;
+    CommandLine cmd;
+    cmd.AddValue("withQos", "With QOS", qosEnabled);
+    cmd.AddValue("simulationTime", "Simulation time in seconds", simulationTime);
+    cmd.AddValue("numClients", "Number of client nodes", numClients);
+    cmd.AddValue("numApps", "Number of applications [1..4]", numApps);
+    cmd.AddValue("serverYPos", "Server node Y position", serverYPos);
+    cmd.AddValue("appStartTime", "Application start time in first client", cliAppStartTime);
+    cmd.AddValue("appStartDelta", "Application start time delta for other clients", cliAppStartDelta);
+    cmd.AddValue("sendInterval", "Send interval in seconds", sendInterval);
+    cmd.Parse(argc, argv);
+    NS_ASSERT(numApps >= 1 && numApps <= 4);
+    int ports[4] = { 5000, 4000, 80, 21 };
+    uint8_t tagVector[4] = { UP_VO, UP_VI, UP_BE, UP_BK };
+
+    // node
+    NodeContainer wifiSrvNode;
+    NodeContainer wifiCliNode;
+    wifiSrvNode.Create(1);
+    wifiCliNode.Create(numClients);
+
+    // phy
+    YansWifiChannelHelper channel = YansWifiChannelHelper::Default();
+    YansWifiPhyHelper phy = YansWifiPhyHelper::Default();
+//    phy.Set("TxPowerStart", DoubleValue(200));
+//    phy.Set("TxPowerEnd", DoubleValue(200));
+    phy.SetChannel(channel.Create());
+    phy.SetPcapDataLinkType(YansWifiPhyHelper::DLT_IEEE802_11_RADIO);
+
+    WifiHelper wifi = WifiHelper::Default();
+    wifi.SetStandard(WIFI_PHY_STANDARD_80211a);
+    wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager",
+        "DataMode", StringValue("OfdmRate54Mbps"),
+        "ControlMode", StringValue("OfdmRate6Mbps"));
+
+    Config::SetDefault("ns3::WifiMacQueue::MaxPacketNumber", UintegerValue(10000));
+
+    Ssid ssid = Ssid("ns3-80211a");
+    WifiMacHelper *macPtr = NULL;
+
+    // mac
+    QosWifiMacHelper macQ = QosWifiMacHelper::Default();
+    NqosWifiMacHelper macNq = NqosWifiMacHelper::Default();
+
+    if (qosEnabled) {
+        macQ.SetType("ns3::AdhocWifiMac", "Ssid", SsidValue(ssid));
+        macPtr = &macQ;
+    }
+    else {
+        macNq.SetType("ns3::AdhocWifiMac", "Ssid", SsidValue(ssid));
+        macPtr = &macNq;
+    }
+
+    // device
+    NetDeviceContainer srvDevice = wifi.Install(phy, *macPtr, wifiSrvNode);
+    NetDeviceContainer cliDevice = wifi.Install(phy, *macPtr, wifiCliNode);
+    NetDeviceContainer devices;
+    devices.Add(srvDevice);
+    devices.Add(cliDevice);
+
+    // random sequences must be the same as in INET
+    wifi.AssignStreams(srvDevice, 0);
+    wifi.AssignStreams(cliDevice, 6);
+
+    // mobility
+    MobilityHelper mobility;
+    Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator>();
+    positionAlloc->Add(Vector(15.0, serverYPos, 0.0)); // server
+    for (int i = 0; i < numClients; i++) {
+        positionAlloc->Add(Vector(10.0 + i * 10.0, 10.0, 0.0)); // clients
+    }
+    mobility.SetPositionAllocator(positionAlloc);
+    mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
+    mobility.Install(wifiSrvNode);
+    mobility.Install(wifiCliNode);
+
+    // internet stack
+    InternetStackHelper stack;
+    stack.Install(wifiSrvNode);
+    stack.Install(wifiCliNode);
+
+    // IP addresses
+    Ipv4AddressHelper address;
+    address.SetBase("192.168.1.0", "255.255.255.0");
+
+    Ipv4InterfaceContainer srvNodeInterface = address.Assign(srvDevice);
+    Ipv4InterfaceContainer cliNodesInterface = address.Assign(cliDevice);
+
+    // server apps
+    ApplicationContainer serverApp;
+    for (int i = 0; i < numApps; i++) {
+        UdpServerHelper myServer(ports[i]);
+        serverApp.Add(myServer.Install(wifiSrvNode.Get(0)));
+    }
+    serverApp.Start(Seconds(0.0));
+    serverApp.Stop(Seconds(simulationTime));
+
+    // client apps
+    ApplicationContainer clientApps;
+    for (int i = 0; i < numApps; i++) {
+        UdpClientHelper myClient(srvNodeInterface.GetAddress(0), ports[i]);
+        myClient.SetAttribute("MaxPackets", UintegerValue(400000u));
+        myClient.SetAttribute("Interval", TimeValue(Seconds(sendInterval))); //packets/s
+        myClient.SetAttribute("PacketSize", UintegerValue(messageLength));
+        ApplicationContainer c = myClient.Install(wifiCliNode);
+        for (int j = 0; j < (int) c.GetN(); j++) {
+            Ptr<Application> app = c.Get(j);
+            app->SetStartTime(Seconds(cliAppStartTime + j * cliAppStartDelta));
+        }
+        for (int j = 0; j < (int) c.GetN(); j++) {
+            Ptr<UdpClient> udpclientapp;
+            udpclientapp = DynamicCast<UdpClient>(c.Get(j));
+            udpclientapp->TraceConnectWithoutContext("Tx", MakeBoundCallback(&TagMarker, tagVector[i]));
+        }
+        clientApps.Add(c);
+    }
+    clientApps.Stop(Seconds(simulationTime));
+
+    // global routing and arp cache
+    PopulateArpCache();
+    Ipv4GlobalRoutingHelper::PopulateRoutingTables();
+
+    Config::Connect("/NodeList/*/DeviceList/*/Phy/State/State", MakeCallback(&PhyStateTrace));
+    Config::Connect("/NodeList/*/DeviceList/*/Phy/State/Tx", MakeCallback(&PhyTxTrace));
+
+    // simulation
+    Simulator::Stop(Seconds(simulationTime));
+    Simulator::Run();
+    Simulator::Destroy();
+
+    return 0;
+}
+
diff --git a/examples/wireless/wifi-backoff.cc b/examples/wireless/wifi-backoff.cc
new file mode 100644
index 0000000..68bc0fb
--- /dev/null
+++ b/examples/wireless/wifi-backoff.cc
@@ -0,0 +1,162 @@
+#include "ns3/applications-module.h"
+#include "ns3/core-module.h"
+#include "ns3/internet-module.h"
+#include "ns3/ipv4-global-routing-helper.h"
+#include "ns3/mobility-module.h"
+#include "ns3/network-module.h"
+#include "ns3/wifi-module.h"
+
+using namespace ns3;
+
+NS_LOG_COMPONENT_DEFINE("wifi-backoff");
+
+void TagMarker(uint8_t tid, Ptr<const Packet> packet)
+{
+    QosTag qosTag;
+    qosTag.SetTid(tid);
+    packet->AddPacketTag(qosTag);
+}
+
+void PhyStateTrace(std::string context, Time start, Time duration, enum WifiPhy::State state)
+{
+    if (state == WifiPhy::TX)
+        std::cout << "START = " << start << std::endl;
+}
+
+void PopulateArpCache()
+{
+    Ptr<ArpCache> arp = CreateObject<ArpCache>();
+    arp->SetAliveTimeout(Seconds(3600 * 24 * 365));
+    for (NodeList::Iterator i = NodeList::Begin(); i != NodeList::End(); ++i) {
+        Ptr<Ipv4L3Protocol> ip = (*i)->GetObject<Ipv4L3Protocol>();
+        NS_ASSERT(ip != 0);
+        ObjectVectorValue interfaces;
+        ip->GetAttribute("InterfaceList", interfaces);
+        for (ObjectVectorValue::Iterator j = interfaces.Begin(); j != interfaces.End(); j++) {
+            Ptr<Ipv4Interface> ipIface = StaticCast<Ipv4Interface, Object>((*j).second);
+            NS_ASSERT(ipIface != 0);
+            Ptr<NetDevice> device = ipIface->GetDevice();
+            NS_ASSERT(device != 0);
+            Mac48Address addr = Mac48Address::ConvertFrom(device->GetAddress());
+            for (uint32_t k = 0; k < ipIface->GetNAddresses(); k++) {
+                Ipv4Address ipAddr = ipIface->GetAddress(k).GetLocal();
+                if (ipAddr == Ipv4Address::GetLoopback())
+                    continue;
+                ArpCache::Entry * entry = arp->Add(ipAddr);
+                entry->SetMacAddresss(addr);
+                entry->MarkPermanent();
+            }
+        }
+    }
+    for (NodeList::Iterator i = NodeList::Begin(); i != NodeList::End(); ++i) {
+        Ptr<Ipv4L3Protocol> ip = (*i)->GetObject<Ipv4L3Protocol>();
+        NS_ASSERT(ip != 0);
+        ObjectVectorValue interfaces;
+        ip->GetAttribute("InterfaceList", interfaces);
+        for (ObjectVectorValue::Iterator j = interfaces.Begin(); j != interfaces.End(); j++) {
+            Ptr<Ipv4Interface> ipIface = StaticCast<Ipv4Interface, Object>((*j).second);
+            ipIface->SetAttribute("ArpCache", PointerValue(arp));
+        }
+    }
+}
+
+void test(bool separateClients)
+{
+    std::cout << "Separate clients: " << separateClients << std::endl;
+    // Nodes
+    NodeContainer wifiSrvNode;
+    NodeContainer wifiCliNode1;
+    NodeContainer wifiCliNode2;
+    wifiSrvNode.Create(1);
+    wifiCliNode1.Create(1);
+    wifiCliNode2.Create(1);
+
+    // Wifi
+    YansWifiChannelHelper channel = YansWifiChannelHelper::Default();
+    YansWifiPhyHelper phy = YansWifiPhyHelper::Default();
+    phy.SetChannel(channel.Create());
+    phy.SetPcapDataLinkType(YansWifiPhyHelper::DLT_IEEE802_11_RADIO);
+
+    WifiHelper wifi = WifiHelper::Default();
+    wifi.SetStandard(WIFI_PHY_STANDARD_80211a);     // WIFI_PHY_STANDARD_80211g
+    wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager",
+        "DataMode", StringValue("OfdmRate54Mbps"),       // ErpOfdmRate54Mbps
+        "ControlMode", StringValue("OfdmRate6Mbps"));    // ErpOfdmRate6Mbps
+
+    QosWifiMacHelper mac = QosWifiMacHelper::Default();
+    Config::SetDefault("ns3::WifiRemoteStationManager::MaxSlrc", UintegerValue(1));
+
+    Ssid ssid = Ssid("ns3-80211a");
+    mac.SetType("ns3::AdhocWifiMac", "Ssid", SsidValue(ssid));
+    NetDeviceContainer srvDevice = wifi.Install(phy, mac, wifiSrvNode);
+    NetDeviceContainer cli1Device = wifi.Install(phy, mac, wifiCliNode1);
+    NetDeviceContainer cli2Device = wifi.Install(phy, mac, wifiCliNode2);
+
+    // Assign the same random streams so that they draw the same backoff periods
+    wifi.AssignStreams(cli1Device, 666);
+    wifi.AssignStreams(cli2Device, 666);
+
+    // Mobility.
+    Ptr<ListPositionAllocator> positionAllocator = CreateObject<ListPositionAllocator>();
+    positionAllocator->Add(Vector(10000.0, 0.0, 0.0));
+    positionAllocator->Add(Vector(0.0, 0.0, 0.0));
+    positionAllocator->Add(Vector(0.0, 0.0, 0.0));
+    MobilityHelper mobility;
+    mobility.SetPositionAllocator(positionAllocator);
+    mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
+    mobility.Install(wifiSrvNode);
+    mobility.Install(wifiCliNode1);
+    mobility.Install(wifiCliNode2);
+
+    // Internet stack
+    InternetStackHelper stack;
+    stack.Install(wifiSrvNode);
+    stack.Install(wifiCliNode1);
+    stack.Install(wifiCliNode2);
+
+    Ipv4AddressHelper address;
+    address.SetBase("192.168.1.0", "255.255.255.0");
+    Ipv4InterfaceContainer srvNodeInterface = address.Assign(srvDevice);
+    address.Assign(cli1Device);
+    address.Assign(cli2Device);
+
+    // Applications
+    UdpClientHelper clientHelper1(srvNodeInterface.GetAddress(0), 5000);
+    clientHelper1.SetAttribute("MaxPackets", UintegerValue(1u));
+    clientHelper1.SetAttribute("PacketSize", UintegerValue(1000));
+    ApplicationContainer clientApp1 = clientHelper1.Install(wifiCliNode1);
+    clientApp1.Start(Seconds(1.0));
+    Ptr<UdpClient> udpClient1;
+    udpClient1 = DynamicCast<UdpClient>(clientApp1.Get(0));
+    udpClient1->TraceConnectWithoutContext("Tx",  MakeBoundCallback(&TagMarker, UP_VO));
+
+    UdpClientHelper clientHelper2(srvNodeInterface.GetAddress(0), 4000);
+    clientHelper2.SetAttribute("MaxPackets", UintegerValue(1u));
+    clientHelper2.SetAttribute("PacketSize", UintegerValue(1000));
+    ApplicationContainer clientApp2 = clientHelper2.Install(separateClients ? wifiCliNode2 : wifiCliNode1);
+    clientApp2.Start(Seconds(1.000001)); // 1us delay to receive the voice packet and backoff
+    Ptr<UdpClient> udpClient2;
+    udpClient2 = DynamicCast<UdpClient>(clientApp2.Get(0));
+    udpClient2->TraceConnectWithoutContext("Tx",  MakeBoundCallback(&TagMarker, UP_VI));
+
+    PopulateArpCache();
+    Ipv4GlobalRoutingHelper::PopulateRoutingTables();
+
+    Config::Connect("/NodeList/*/DeviceList/*/Phy/State/State", MakeCallback(&PhyStateTrace));
+
+    Simulator::Stop(Seconds(5.0));
+    Simulator::Run();
+    Simulator::Destroy();
+}
+
+int main(int argc, char *argv[])
+{
+    Packet::EnableChecking();
+    Time::SetResolution(Time::PS);
+
+    test(false);
+    test(true);
+
+    return 0;
+}
+
diff --git a/examples/wireless/wscript b/examples/wireless/wscript
index 1336e41..e70024b 100644
--- a/examples/wireless/wscript
+++ b/examples/wireless/wscript
@@ -84,3 +84,9 @@ def build(bld):
 
     obj = bld.create_ns3_program('simple-ht-hidden-stations', ['internet', 'mobility', 'wifi', 'applications'])    
     obj.source = 'simple-ht-hidden-stations.cc'
+
+    obj = bld.create_ns3_program('inet-wireless-udp', ['internet', 'mobility', 'wifi', 'applications'])
+    obj.source = 'inet-wireless-udp.cc'
+
+    obj = bld.create_ns3_program('wifi-backoff', ['internet', 'mobility', 'wifi', 'applications'])
+    obj.source = 'wifi-backoff.cc'
diff --git a/src/applications/model/udp-client.cc b/src/applications/model/udp-client.cc
index 49347c3..415ab99 100644
--- a/src/applications/model/udp-client.cc
+++ b/src/applications/model/udp-client.cc
@@ -69,6 +69,9 @@ UdpClient::GetTypeId (void)
                    UintegerValue (1024),
                    MakeUintegerAccessor (&UdpClient::m_size),
                    MakeUintegerChecker<uint32_t> (12,1500))
+    .AddTraceSource ("Tx", "A new packet is created and is sent",
+                   MakeTraceSourceAccessor (&UdpClient::m_txTrace),
+                   "ns3::Packet::TracedCallback")
   ;
   return tid;
 }
@@ -169,6 +172,7 @@ UdpClient::Send (void)
       peerAddressStringStream << Ipv6Address::ConvertFrom (m_peerAddress);
     }
 
+  m_txTrace (p);
   if ((m_socket->Send (p)) >= 0)
     {
       ++m_sent;
diff --git a/src/applications/model/udp-client.h b/src/applications/model/udp-client.h
index 642d033..6d13df0 100644
--- a/src/applications/model/udp-client.h
+++ b/src/applications/model/udp-client.h
@@ -27,6 +27,7 @@
 #include "ns3/event-id.h"
 #include "ns3/ptr.h"
 #include "ns3/ipv4-address.h"
+#include "ns3/traced-callback.h"
 
 namespace ns3 {
 
@@ -95,6 +96,8 @@ private:
   uint16_t m_peerPort; //!< Remote peer port
   EventId m_sendEvent; //!< Event to send the next packet
 
+  /// Traced Callback: transmitted packets.
+  TracedCallback<Ptr<const Packet> > m_txTrace;
 };
 
 } // namespace ns3
diff --git a/src/core/model/clcg32.cc b/src/core/model/clcg32.cc
new file mode 100644
index 0000000..964736d
--- /dev/null
+++ b/src/core/model/clcg32.cc
@@ -0,0 +1,121 @@
+#include "ns3/clcg32.h"
+
+int cLCG32::nextId = 0;
+
+void cLCG32::initialize(int seedSet, int rngId, int numRngs)
+{
+    int autoSeedIndex = seedSet * numRngs + rngId;
+    autoSeedIndex = autoSeedIndex % 256;
+    seed = autoSeeds[autoSeedIndex];
+}
+
+void cLCG32::selfTest()
+{
+    seed = 1;
+    for (int i = 0; i < 10000; i++)
+        intRand();
+}
+
+unsigned long cLCG32::intRand()
+{
+    numDrawn++;
+    const long int a = 16807, q = 127773, r = 2836;
+    seed = a * (seed % q) - r * (seed / q);
+    if (seed <= 0)
+        seed += LCG32_MAX + 1;
+    return seed - 1;  // shift range [1..2^31-2] to [0..2^31-3]
+}
+
+unsigned long cLCG32::intRandMax()
+{
+    return LCG32_MAX - 1;  // 2^31-3
+}
+
+unsigned long cLCG32::intRand(unsigned long n)
+{
+    // code from MersenneTwister.h, Richard J. Wagner rjwagner@writeme.com
+    // Find which bits are used in n
+    unsigned long used = n - 1;
+    used |= used >> 1;
+    used |= used >> 2;
+    used |= used >> 4;
+    used |= used >> 8;
+    used |= used >> 16;
+
+    // Draw numbers until one is found in [0,n]
+    unsigned long i;
+    do
+        i = intRand() & used;  // toss unused bits to shorten search
+    while (i >= n);
+    return i;
+}
+
+double cLCG32::doubleRand()
+{
+    return (double)intRand() * (1.0 / LCG32_MAX);
+}
+
+double cLCG32::doubleRandNonz()
+{
+    return (double)(intRand() + 1) * (1.0 / (LCG32_MAX + 1));
+}
+
+double cLCG32::doubleRandIncl1()
+{
+    return (double)intRand() * (1.0 / (LCG32_MAX - 1));
+}
+
+long cLCG32::autoSeeds[] = {
+    1L, 1331238991L, 1550655590L, 930627303L, 766698560L, 372156336L,
+    1645116277L, 1635860990L, 1154667137L, 692982627L, 1961833381L,
+    713190994L, 460575272L, 1298018763L, 1497719440L, 2030952567L,
+    901595110L, 631930165L, 354421844L, 1213737427L, 1800697079L,
+    795809157L, 821079954L, 1624537871L, 1918430133L, 861482464L,
+    1736896562L, 1220028201L, 634729389L, 456922549L, 23246132L,
+    979545543L, 1008653149L, 1156436224L, 1689665648L, 1604778030L,
+    1628735393L, 1949577498L, 550023088L, 1726571906L, 1267216792L,
+    1750609806L, 314116942L, 736299588L, 2095003524L, 1281569003L,
+    356484144L, 1423591576L, 2140958617L, 1577658393L, 1116852912L,
+    1865734753L, 1701937813L, 301264580L, 171817360L, 1809513683L,
+    360646631L, 546534802L, 1652205397L, 136501886L, 605448579L,
+    1857604347L, 1223969344L, 668104522L, 1821072732L, 738721927L,
+    1237280745L, 1753702432L, 2125855022L, 1259255700L, 935058038L,
+    1325807218L, 1151620124L, 585222105L, 1970906347L, 1267057970L,
+    66562942L, 1959090863L, 1503754591L, 114059398L, 2007872839L,
+    1886985293L, 1870986444L, 2110445215L, 1375265396L, 1512926254L,
+    470646700L, 1951555990L, 500432100L, 1843528576L, 347147950L,
+    1431668171L, 929595364L, 1507452793L, 800443847L, 1428656866L,
+    5715478L, 1607979231L, 2032092669L, 37809413L, 996425830L,
+    1010869813L, 1884232020L, 312192738L, 1821061493L, 462270727L,
+    248900140L, 678804905L, 905130946L, 1892339752L, 1307421505L,
+    491642575L, 1091346202L, 1076664921L, 1140141037L, 122447008L,
+    1244153851L, 1382627577L, 611793617L, 1989326495L, 808278095L,
+    1352281487L, 2106046913L, 1731628906L, 1226683843L, 1683200486L,
+    90274853L, 1676390615L, 2147466840L, 498396356L, 2140522509L,
+    1217803227L, 1146667727L, 788324559L, 1530171233L, 317473611L,
+    319146380L, 992289339L, 2077765218L, 652681396L, 789950931L,
+    485020132L, 632682054L, 32775496L, 1683083109L, 603834907L,
+    351704670L, 1809710911L, 171230418L, 1511135464L, 1986612391L,
+    1646573708L, 1411714374L, 1546459273L, 872179784L, 1307370996L,
+    801917373L, 2051724276L, 144283230L, 1535180348L, 1949917822L,
+    650872229L, 113201992L, 890256110L, 1965781805L, 1903960687L,
+    679060319L, 452497769L, 630187802L, 174438105L, 1298843779L,
+    961082145L, 1565131991L, 2078229636L, 50366922L, 959177042L,
+    144513213L, 1423462005L, 207666443L, 152219823L, 13354949L,
+    412643566L, 631135695L, 166938633L, 958408264L, 1324624652L,
+    494931978L, 1472820641L, 1150735880L, 1508483704L, 1640573652L,
+    359288909L, 1315013967L, 1051019865L, 1254156333L, 1883764098L,
+    587564032L, 1288274932L, 1912367727L, 1595891993L, 2138169990L,
+    1794668172L, 2059764593L, 1152025509L, 115613893L, 926625010L,
+    131630606L, 706594585L, 1386707532L, 1624163092L, 2081362360L,
+    1882152641L, 1428465736L, 602313149L, 1170668648L, 863700348L,
+    931140599L, 1856765731L, 197473249L, 507314638L, 1381732824L,
+    252975355L, 925311926L, 1726193892L, 576725369L, 774762078L,
+    198434005L, 192355221L, 1296038143L, 1201667973L, 653782169L,
+    1426685702L, 1503907840L, 211726157L, 33491376L, 906578176L,
+    238345926L, 1826083853L, 1366925216L, 480315631L, 1549695660L,
+    1337366022L, 1793656969L, 1469954017L, 1701980729L, 98857548L,
+    1883864564L, 1709982325L, 251608257L, 1171967839L, 642486710L,
+    1358844649L, 1115145546L, 1398997376L, 1021484058L, 2035865982L,
+};
+
diff --git a/src/core/model/clcg32.h b/src/core/model/clcg32.h
new file mode 100644
index 0000000..64badc9
--- /dev/null
+++ b/src/core/model/clcg32.h
@@ -0,0 +1,71 @@
+#ifndef __NS3_CLCG32_H
+#define __NS3_CLCG32_H
+
+#define LCG32_MAX  0x7ffffffeL  /* = 2^31-2 */
+
+/**
+ * Implements a 32-bit (2^31-2 cycle length) linear congruential random
+ * number generator.
+ *    - Range:              1 ... 2^31-2
+ *    - Period length:      2^31-2
+ *    - Method:             x=(x * 7^5) mod (2^31-1)
+ *    - Required hardware:  exactly 32-bit integer aritmetics
+ *    - To check:           if  x[0]=1  then  x[10000]=1,043,618,065
+ *
+ * Source:  Raj Jain: The Art of Computer Systems Performance Analysis
+ * (John Wiley & Sons, 1991) pp 441-444, 455.
+ */
+class cLCG32
+{
+  public:
+    int id;
+  protected:
+    static int nextId;
+    long numDrawn;
+    long seed;
+
+    // 256 pre-generated seeds, spaced 8,388,608 values in the sequence.
+    // This covers the whole RNG period. Enough for 128 runs with 2 RNGs
+    // each, or 64 runs with 4 RNGs each -- assuming one run never uses
+    // more than 8 million random numbers per RNG.
+    static long autoSeeds[256];
+
+  public:
+    cLCG32() : id(nextId++), numDrawn(0), seed(0) { initialize(0, 0, 0); }
+    virtual ~cLCG32() {}
+
+    /** Sets up the RNG. */
+    virtual void initialize(int seedSet, int rngId, int numRngs);
+
+    /** Tests correctness of the RNG */
+    virtual void selfTest();
+
+    /**
+     * Returns how many random numbers have been drawn from this RNG.
+     * Subclasses should increment numDrawn in the intRand(), etc. methods.
+     */
+    virtual unsigned long getNumbersDrawn() const  {return numDrawn;}
+
+    /** Random integer in the range [0,intRandMax()] */
+    virtual unsigned long intRand();
+
+    /** Maximum value that can be returned by intRand() */
+    virtual unsigned long intRandMax();
+
+    /** Random integer in [0,n), n < intRandMax() */
+    virtual unsigned long intRand(unsigned long n);
+
+    /** Random double on the [0,1) interval */
+    virtual double doubleRand();
+
+    /** Random double on the (0,1) interval */
+    virtual double doubleRandNonz();
+
+    /** Random double on the [0,1] interval */
+    virtual double doubleRandIncl1();
+};
+
+
+#endif
+
+
diff --git a/src/core/wscript b/src/core/wscript
index 1535d66..8c41388 100644
--- a/src/core/wscript
+++ b/src/core/wscript
@@ -160,6 +160,7 @@ def build(bld):
         'model/random-variable-stream.cc',
         'model/rng-seed-manager.cc',
         'model/rng-stream.cc',
+        'model/clcg32.cc',
         'model/command-line.cc',
         'model/type-name.cc',
         'model/attribute.cc',
@@ -256,6 +257,7 @@ def build(bld):
         'model/random-variable-stream.h',
         'model/rng-seed-manager.h',
         'model/rng-stream.h',
+        'model/clcg32.h',
         'model/command-line.h',
         'model/type-name.h',
         'model/type-traits.h',
diff --git a/src/wifi/bindings/modulegen__gcc_ILP32.py b/src/wifi/bindings/modulegen__gcc_ILP32.py
index 9ba4c4e..380cdad 100644
--- a/src/wifi/bindings/modulegen__gcc_ILP32.py
+++ b/src/wifi/bindings/modulegen__gcc_ILP32.py
@@ -8890,7 +8890,7 @@ def register_Ns3WifiRemoteStationManager_methods(root_module, cls):
     ## wifi-remote-station-manager.h (module 'wifi'): void ns3::WifiRemoteStationManager::ReportDataFailed(ns3::Mac48Address address, ns3::WifiMacHeader const * header) [member function]
     cls.add_method('ReportDataFailed', 
                    'void', 
-                   [param('ns3::Mac48Address', 'address'), param('ns3::WifiMacHeader const *', 'header')])
+                   [param('ns3::Mac48Address', 'address'), param('ns3::WifiMacHeader const *', 'header'), param('ns3::Ptr< ns3::Packet const >', 'p')])
     ## wifi-remote-station-manager.h (module 'wifi'): void ns3::WifiRemoteStationManager::ReportDataOk(ns3::Mac48Address address, ns3::WifiMacHeader const * header, double ackSnr, ns3::WifiMode ackMode, double dataSnr) [member function]
     cls.add_method('ReportDataOk', 
                    'void', 
@@ -8898,7 +8898,7 @@ def register_Ns3WifiRemoteStationManager_methods(root_module, cls):
     ## wifi-remote-station-manager.h (module 'wifi'): void ns3::WifiRemoteStationManager::ReportFinalDataFailed(ns3::Mac48Address address, ns3::WifiMacHeader const * header) [member function]
     cls.add_method('ReportFinalDataFailed', 
                    'void', 
-                   [param('ns3::Mac48Address', 'address'), param('ns3::WifiMacHeader const *', 'header')])
+                   [param('ns3::Mac48Address', 'address'), param('ns3::WifiMacHeader const *', 'header'), param('ns3::Ptr< ns3::Packet const >', 'p')])
     ## wifi-remote-station-manager.h (module 'wifi'): void ns3::WifiRemoteStationManager::ReportFinalRtsFailed(ns3::Mac48Address address, ns3::WifiMacHeader const * header) [member function]
     cls.add_method('ReportFinalRtsFailed', 
                    'void', 
diff --git a/src/wifi/bindings/modulegen__gcc_LP64.py b/src/wifi/bindings/modulegen__gcc_LP64.py
index 9ba4c4e..380cdad 100644
--- a/src/wifi/bindings/modulegen__gcc_LP64.py
+++ b/src/wifi/bindings/modulegen__gcc_LP64.py
@@ -8890,7 +8890,7 @@ def register_Ns3WifiRemoteStationManager_methods(root_module, cls):
     ## wifi-remote-station-manager.h (module 'wifi'): void ns3::WifiRemoteStationManager::ReportDataFailed(ns3::Mac48Address address, ns3::WifiMacHeader const * header) [member function]
     cls.add_method('ReportDataFailed', 
                    'void', 
-                   [param('ns3::Mac48Address', 'address'), param('ns3::WifiMacHeader const *', 'header')])
+                   [param('ns3::Mac48Address', 'address'), param('ns3::WifiMacHeader const *', 'header'), param('ns3::Ptr< ns3::Packet const >', 'p')])
     ## wifi-remote-station-manager.h (module 'wifi'): void ns3::WifiRemoteStationManager::ReportDataOk(ns3::Mac48Address address, ns3::WifiMacHeader const * header, double ackSnr, ns3::WifiMode ackMode, double dataSnr) [member function]
     cls.add_method('ReportDataOk', 
                    'void', 
@@ -8898,7 +8898,7 @@ def register_Ns3WifiRemoteStationManager_methods(root_module, cls):
     ## wifi-remote-station-manager.h (module 'wifi'): void ns3::WifiRemoteStationManager::ReportFinalDataFailed(ns3::Mac48Address address, ns3::WifiMacHeader const * header) [member function]
     cls.add_method('ReportFinalDataFailed', 
                    'void', 
-                   [param('ns3::Mac48Address', 'address'), param('ns3::WifiMacHeader const *', 'header')])
+                   [param('ns3::Mac48Address', 'address'), param('ns3::WifiMacHeader const *', 'header'), param('ns3::Ptr< ns3::Packet const >', 'p')])
     ## wifi-remote-station-manager.h (module 'wifi'): void ns3::WifiRemoteStationManager::ReportFinalRtsFailed(ns3::Mac48Address address, ns3::WifiMacHeader const * header) [member function]
     cls.add_method('ReportFinalRtsFailed', 
                    'void', 
diff --git a/src/wifi/model/block-ack-manager.cc b/src/wifi/model/block-ack-manager.cc
index 52ef1b9..c4956d0 100644
--- a/src/wifi/model/block-ack-manager.cc
+++ b/src/wifi/model/block-ack-manager.cc
@@ -606,7 +606,7 @@ BlockAckManager::NotifyGotBlockAck (const CtrlBAckResponseHeader *blockAck, Mac4
                           (*it).second.first.SetStartingSequence (sequenceFirstLost);
                         }
                       //notify remote station of unsuccessful transmission
-                      m_stationManager->ReportDataFailed ((*queueIt).hdr.GetAddr1 (), &(*queueIt).hdr);
+                      m_stationManager->ReportDataFailed ((*queueIt).hdr.GetAddr1 (), &(*queueIt).hdr, (*queueIt).packet);
                       if (!m_txFailedCallback.IsNull ())
                         {
                           m_txFailedCallback ((*queueIt).hdr);
diff --git a/src/wifi/model/dca-txop.cc b/src/wifi/model/dca-txop.cc
index dfce078..9c356b8 100644
--- a/src/wifi/model/dca-txop.cc
+++ b/src/wifi/model/dca-txop.cc
@@ -624,7 +624,7 @@ DcaTxop::MissedAck (void)
   if (!NeedDataRetransmission ())
     {
       NS_LOG_DEBUG ("Ack Fail");
-      m_stationManager->ReportFinalDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr);
+      m_stationManager->ReportFinalDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr, m_currentPacket);
       if (!m_txFailedCallback.IsNull ())
         {
           m_txFailedCallback (m_currentHdr);
diff --git a/src/wifi/model/dcf-manager.cc b/src/wifi/model/dcf-manager.cc
index f77b625..2f98d5b 100644
--- a/src/wifi/model/dcf-manager.cc
+++ b/src/wifi/model/dcf-manager.cc
@@ -214,6 +214,10 @@ public:
   {
     m_dcf->NotifyNavResetNow (duration);
   }
+  virtual void TxNavStart (Time duration)
+  {
+    m_dcf->NotifyTxNavStartNow(duration);
+  }
   virtual void AckTimeoutStart (Time duration)
   {
     m_dcf->NotifyAckTimeoutStartNow (duration);
@@ -297,10 +301,12 @@ private:
  ****************************************************************/
 
 DcfManager::DcfManager ()
-  : m_lastAckTimeoutEnd (MicroSeconds (0)),
+  : m_grantedState(0),
+    m_lastAckTimeoutEnd (MicroSeconds (0)),
     m_lastCtsTimeoutEnd (MicroSeconds (0)),
     m_lastNavStart (MicroSeconds (0)),
     m_lastNavDuration (MicroSeconds (0)),
+    m_lastTxNavDuration (MicroSeconds (0)),
     m_lastRxStart (MicroSeconds (0)),
     m_lastRxDuration (MicroSeconds (0)),
     m_lastRxReceivedOk (true),
@@ -452,6 +458,20 @@ DcfManager::MostRecent (Time a, Time b, Time c, Time d, Time e, Time f, Time g)
   return retval;
 }
 
+Time
+DcfManager::MostRecent (Time a, Time b, Time c, Time d, Time e, Time f, Time g, Time h) const
+{
+  NS_LOG_FUNCTION (this << a << b << c << d << e << f << g << h);
+  Time i = Max (a, b);
+  Time j = Max (c, d);
+  Time k = Max (e, f);
+  Time l = Max (g, h);
+  Time m = Max (i, j);
+  Time n = Max (k, l);
+  Time retval = Max (m, n);
+  return retval;
+}
+
 bool
 DcfManager::IsBusy (void) const
 {
@@ -547,6 +567,7 @@ DcfManager::DoGrantAccess (void)
            * could change the global state of the manager, and, thus, could change
            * the result of the calculations.
            */
+          m_grantedState = state;
           state->NotifyAccessGranted ();
           for (std::vector<DcfState *>::const_iterator k = internalCollisionStates.begin ();
                k != internalCollisionStates.end (); k++)
@@ -569,7 +590,7 @@ DcfManager::AccessTimeout (void)
 }
 
 Time
-DcfManager::GetAccessGrantStart (void) const
+DcfManager::GetAccessGrantStart (DcfState *state) const
 {
   NS_LOG_FUNCTION (this);
   Time rxAccessStart;
@@ -587,13 +608,15 @@ DcfManager::GetAccessGrantStart (void) const
     }
   Time busyAccessStart = m_lastBusyStart + m_lastBusyDuration + m_sifs;
   Time txAccessStart = m_lastTxStart + m_lastTxDuration + m_sifs;
+  Time txNavAccessStart = m_grantedState == state ? Seconds(0) : m_lastTxStart + m_lastTxDuration + m_lastTxNavDuration + m_sifs;
   Time navAccessStart = m_lastNavStart + m_lastNavDuration + m_sifs;
-  Time ackTimeoutAccessStart = m_lastAckTimeoutEnd + m_sifs;
+  Time ackTimeoutAccessStart = m_grantedState == state ? m_lastAckTimeoutEnd + m_sifs : Seconds(0);
   Time ctsTimeoutAccessStart = m_lastCtsTimeoutEnd + m_sifs;
   Time switchingAccessStart = m_lastSwitchingStart + m_lastSwitchingDuration + m_sifs;
   Time accessGrantedStart = MostRecent (rxAccessStart,
                                         busyAccessStart,
                                         txAccessStart,
+                                        txNavAccessStart,
                                         navAccessStart,
                                         ackTimeoutAccessStart,
                                         ctsTimeoutAccessStart,
@@ -612,7 +635,7 @@ DcfManager::GetBackoffStartFor (DcfState *state)
 {
   NS_LOG_FUNCTION (this << state);
   Time mostRecentEvent = MostRecent (state->GetBackoffStart (),
-                                     GetAccessGrantStart () + MicroSeconds (state->GetAifsn () * m_slotTimeUs));
+                                     GetAccessGrantStart (state) + MicroSeconds (state->GetAifsn () * m_slotTimeUs));
 
   return mostRecentEvent;
 }
@@ -878,6 +901,12 @@ DcfManager::NotifyNavStartNow (Time duration)
       m_lastNavDuration = duration;
     }
 }
+void
+DcfManager::NotifyTxNavStartNow (Time duration)
+{
+  NS_LOG_FUNCTION (this << duration);
+  m_lastTxNavDuration = duration;
+}
 
 void
 DcfManager::NotifyAckTimeoutStartNow (Time duration)
diff --git a/src/wifi/model/dcf-manager.h b/src/wifi/model/dcf-manager.h
index 10ea55b..feacde1 100644
--- a/src/wifi/model/dcf-manager.h
+++ b/src/wifi/model/dcf-manager.h
@@ -383,6 +383,12 @@ public:
    */
   void NotifyNavStartNow (Time duration);
   /**
+   * \param duration the value of the transmitted NAV.
+   *
+   * Called at start of tx
+   */
+  void NotifyTxNavStartNow (Time duration);
+  /**
    * Notify that ACK timer has started for the given duration.
    *
    * \param duration
@@ -467,12 +473,27 @@ private:
    */
   Time MostRecent (Time a, Time b, Time c, Time d, Time e, Time f, Time g) const;
   /**
+   * Return the most recent time.
+   *
+   * \param a
+   * \param b
+   * \param c
+   * \param d
+   * \param e
+   * \param f
+   * \param g
+   * \param h
+   *
+   * \return the most recent time
+   */
+  Time MostRecent (Time a, Time b, Time c, Time d, Time e, Time f, Time g, Time h) const;
+  /**
    * Access will never be granted to the medium _before_
    * the time returned by this method.
    *
    * \returns the absolute time at which access could start to be granted
    */
-  Time GetAccessGrantStart (void) const;
+  Time GetAccessGrantStart (DcfState *state) const;
   /**
    * Return the time when the backoff procedure
    * started for the given DcfState.
@@ -518,10 +539,12 @@ private:
   typedef std::vector<DcfState *> States;
 
   States m_states;
+  DcfState *m_grantedState;
   Time m_lastAckTimeoutEnd;
   Time m_lastCtsTimeoutEnd;
   Time m_lastNavStart;
   Time m_lastNavDuration;
+  Time m_lastTxNavDuration;
   Time m_lastRxStart;
   Time m_lastRxDuration;
   bool m_lastRxReceivedOk;
diff --git a/src/wifi/model/edca-txop-n.cc b/src/wifi/model/edca-txop-n.cc
index e4f7ab5..1e6aafa 100644
--- a/src/wifi/model/edca-txop-n.cc
+++ b/src/wifi/model/edca-txop-n.cc
@@ -470,7 +470,7 @@ EdcaTxopN::RemoveRetransmitPacket (uint8_t tid, Mac48Address recipient, uint16_t
 }
 
 void
-EdcaTxopN::NotifyAccessGranted (void)
+EdcaTxopN::EnsurePacketDequeued (void)
 {
   NS_LOG_FUNCTION (this);
   if (m_currentPacket == 0)
@@ -520,6 +520,13 @@ EdcaTxopN::NotifyAccessGranted (void)
             }
         }
     }
+}
+
+void
+EdcaTxopN::NotifyAccessGranted (void)
+{
+  NS_LOG_FUNCTION (this);
+  EnsurePacketDequeued();
   MacLowTransmissionParameters params;
   params.DisableOverrideDurationId ();
   if (m_currentHdr.GetAddr1 ().IsGroup ())
@@ -643,7 +650,11 @@ EdcaTxopN::NotifyAccessGranted (void)
 void EdcaTxopN::NotifyInternalCollision (void)
 {
   NS_LOG_FUNCTION (this);
-  NotifyCollision ();
+  std::cout << "IC: " << "ac = ???" << ", seq = ??? " << std::endl;
+  std::cout << "RE: " << "ac = ???" << ", seq = ??? " << std::endl;
+  EnsurePacketDequeued ();
+  m_stationManager->ReportDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr, m_currentPacket);
+  MissedAck();
 }
 
 void
@@ -821,7 +832,7 @@ EdcaTxopN::MissedAck (void)
   if (!NeedDataRetransmission ())
     {
       NS_LOG_DEBUG ("Ack Fail");
-      m_stationManager->ReportFinalDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr);
+      m_stationManager->ReportFinalDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr, m_currentPacket);
       bool resetCurrentPacket = true;
       if (!m_txFailedCallback.IsNull ())
         {
diff --git a/src/wifi/model/edca-txop-n.h b/src/wifi/model/edca-txop-n.h
index ad5917f..2127c1f 100644
--- a/src/wifi/model/edca-txop-n.h
+++ b/src/wifi/model/edca-txop-n.h
@@ -203,6 +203,7 @@ public:
    *         false otherwise
    */
   bool NeedsAccess (void) const;
+  void EnsurePacketDequeued (void);
   /**
    * Notify the EDCAF that access has been granted.
    */
diff --git a/src/wifi/model/mac-low.cc b/src/wifi/model/mac-low.cc
index d968de8..07683bc 100644
--- a/src/wifi/model/mac-low.cc
+++ b/src/wifi/model/mac-low.cc
@@ -1549,6 +1549,15 @@ MacLow::DoNavStartNow (Time duration)
 }
 
 void
+MacLow::NotifyTxNavStartNow (Time duration)
+{
+  for (DcfListenersCI i = m_dcfListeners.begin (); i != m_dcfListeners.end (); i++)
+    {
+      (*i)->TxNavStart (duration);
+    }
+}
+
+void
 MacLow::NotifyAckTimeoutStartNow (Time duration)
 {
   for (DcfListenersCI i = m_dcfListeners.begin (); i != m_dcfListeners.end (); i++)
@@ -1595,6 +1604,7 @@ MacLow::ForwardDown (Ptr<const Packet> packet, const WifiMacHeader* hdr,
                 ", mode=" << txVector.GetMode  () <<
                 ", duration=" << hdr->GetDuration () <<
                 ", seq=0x" << std::hex << m_currentHdr.GetSequenceControl () << std::dec);
+  NotifyTxNavStartNow(hdr->GetDuration());
   if (!m_ampdu || hdr->IsRts ())
     {
       m_phy->SendPacket (packet, txVector, preamble, 0, 0);
@@ -1701,7 +1711,7 @@ MacLow::NormalAckTimeout (void)
   /// \todo should check that there was no rx start before now.
   /// we should restart a new ack timeout now until the expected
   /// end of rx if there was a rx start before now.
-  m_stationManager->ReportDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr);
+  m_stationManager->ReportDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr, m_currentPacket);
   MacLowTransmissionListener *listener = m_listener;
   m_listener = 0;
   m_sentMpdus = 0;
@@ -1714,7 +1724,7 @@ void
 MacLow::FastAckTimeout (void)
 {
   NS_LOG_FUNCTION (this);
-  m_stationManager->ReportDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr);
+  m_stationManager->ReportDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr, m_currentPacket);
   MacLowTransmissionListener *listener = m_listener;
   m_listener = 0;
   if (m_phy->IsStateIdle ())
@@ -1734,7 +1744,7 @@ MacLow::BlockAckTimeout (void)
   NS_LOG_FUNCTION (this);
   NS_LOG_DEBUG ("block ack timeout");
 
-  m_stationManager->ReportDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr);
+  m_stationManager->ReportDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr, m_currentPacket);
   MacLowTransmissionListener *listener = m_listener;
   m_listener = 0;
   m_sentMpdus = 0;
@@ -1747,7 +1757,7 @@ void
 MacLow::SuperFastAckTimeout ()
 {
   NS_LOG_FUNCTION (this);
-  m_stationManager->ReportDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr);
+  m_stationManager->ReportDataFailed (m_currentHdr.GetAddr1 (), &m_currentHdr, m_currentPacket);
   MacLowTransmissionListener *listener = m_listener;
   m_listener = 0;
   if (m_phy->IsStateIdle ())
@@ -1999,7 +2009,8 @@ MacLow::SendDataPacket (void)
     }
 
   ForwardDown (m_currentPacket, &m_currentHdr, dataTxVector, preamble);
-  m_currentPacket = 0;
+// KLUDGE: uncommented to be able to pass it to reportDataFailed
+// m_currentPacket = 0;
 }
 
 bool
diff --git a/src/wifi/model/mac-low.h b/src/wifi/model/mac-low.h
index 53e5a25..4c9bb69 100644
--- a/src/wifi/model/mac-low.h
+++ b/src/wifi/model/mac-low.h
@@ -165,6 +165,12 @@ public:
    */
   virtual void NavReset (Time duration) = 0;
   /**
+   * Notify that TXNAV has started for the given duration.
+   *
+   * \param duration duration of TXNAV timer
+   */
+  virtual void TxNavStart (Time duration) = 0;
+  /**
    * Notify that ACK timeout has started for a given duration.
    *
    * \param duration duration of ACK timeout
@@ -1045,6 +1051,12 @@ private:
    */
   bool IsNavZero (void) const;
   /**
+   * Start TXNAV with the given duration.
+   *
+   * \param duration
+   */
+  void NotifyTxNavStartNow (Time duration);
+  /**
    * Notify DcfManager (via DcfListener) that
    * ACK timer should be started for the given
    * duration.
diff --git a/src/wifi/model/random-stream.cc b/src/wifi/model/random-stream.cc
index 3fe8619..83cdccc 100644
--- a/src/wifi/model/random-stream.cc
+++ b/src/wifi/model/random-stream.cc
@@ -20,6 +20,7 @@
 
 #include "random-stream.h"
 #include "ns3/assert.h"
+#include "ns3/simulator.h"
 #include <cmath>
 
 namespace ns3 {
@@ -28,22 +29,27 @@ RandomStream::~RandomStream ()
 {
 }
 
-
 RealRandomStream::RealRandomStream ()
 {
   m_stream = CreateObject<UniformRandomVariable> ();
+  m_lcg32.initialize(0, 0, 0);
 }
 
 uint32_t
 RealRandomStream::GetNext (uint32_t min, uint32_t max)
 {
-  return m_stream->GetInteger (min, max);
+  NS_ASSERT(min == 0);
+  uint32_t v = m_lcg32.intRand(max + 1);
+  static const char*AC[] = {"AC_BE_NQOS", "AC_VO", "AC_VI", "AC_BK", "AC_BE"};
+  std::cout << "GB: " << "ac = " << AC[m_lcg32.id % 5] << ", cw = " << max << ", slots = " << v << ", nth = " << m_lcg32.getNumbersDrawn() << std::endl;
+  return v;
 }
 
 int64_t
 RealRandomStream::AssignStreams (int64_t stream)
 {
   m_stream->SetStream (stream);
+  m_lcg32.initialize(0, stream, 0);
   return 1;
 }
 
diff --git a/src/wifi/model/random-stream.h b/src/wifi/model/random-stream.h
index 6998d89..e76c8fd 100644
--- a/src/wifi/model/random-stream.h
+++ b/src/wifi/model/random-stream.h
@@ -24,6 +24,7 @@
 #include <stdint.h>
 #include <list>
 #include "ns3/random-variable-stream.h"
+#include "ns3/clcg32.h"
 
 namespace ns3 {
 
@@ -60,6 +61,9 @@ public:
 
 class RealRandomStream : public RandomStream
 {
+private:
+  cLCG32 m_lcg32;
+
 public:
   RealRandomStream ();
   virtual uint32_t GetNext (uint32_t min, uint32_t max);
diff --git a/src/wifi/model/wifi-mac.cc b/src/wifi/model/wifi-mac.cc
index a5bc952..287229a 100644
--- a/src/wifi/model/wifi-mac.cc
+++ b/src/wifi/model/wifi-mac.cc
@@ -331,8 +331,8 @@ WifiMac::Configure80211a (void)
   SetSlot (MicroSeconds (9));
   SetEifsNoDifs (MicroSeconds (16 + 44));
   SetPifs (MicroSeconds (16 + 9));
-  SetCtsTimeout (MicroSeconds (16 + 44 + 9 + GetDefaultMaxPropagationDelay ().GetMicroSeconds () * 2));
-  SetAckTimeout (MicroSeconds (16 + 44 + 9 + GetDefaultMaxPropagationDelay ().GetMicroSeconds () * 2));
+  SetCtsTimeout (MicroSeconds (16 + 44 + 9));
+  SetAckTimeout (MicroSeconds (16 + 44 + 9));
 }
 
 void
diff --git a/src/wifi/model/wifi-remote-station-manager.cc b/src/wifi/model/wifi-remote-station-manager.cc
index e748f54..89f41a9 100644
--- a/src/wifi/model/wifi-remote-station-manager.cc
+++ b/src/wifi/model/wifi-remote-station-manager.cc
@@ -30,6 +30,7 @@
 #include "ns3/wifi-phy.h"
 #include "ns3/wifi-mac.h"
 #include "ns3/trace-source-accessor.h"
+#include "ns3/seq-ts-header.h"
 #include "wifi-mac-header.h"
 #include "wifi-mac-trailer.h"
 
@@ -707,8 +708,27 @@ WifiRemoteStationManager::ReportRtsFailed (Mac48Address address, const WifiMacHe
   DoReportRtsFailed (station);
 }
 
+static int getSeq(const Ptr<const Packet> packet)
+{
+  int seq = -1;
+  if (packet.operator->()) {
+      PacketMetadata::ItemIterator i = packet->BeginItem();
+      while (i.HasNext()) {
+          PacketMetadata::Item item = i.Next();
+          if (!item.isFragment && item.type == PacketMetadata::Item::HEADER) {
+              if (item.tid == SeqTsHeader::GetTypeId()) {
+                  SeqTsHeader header;
+                  header.Deserialize(item.current);
+                  seq = header.GetSeq();
+              }
+          }
+      }
+  }
+  return seq;
+}
+
 void
-WifiRemoteStationManager::ReportDataFailed (Mac48Address address, const WifiMacHeader *header)
+WifiRemoteStationManager::ReportDataFailed (Mac48Address address, const WifiMacHeader *header, const Ptr<const Packet> packet)
 {
   NS_LOG_FUNCTION (this << address << *header);
   NS_ASSERT (!address.IsGroup ());
@@ -716,6 +736,10 @@ WifiRemoteStationManager::ReportDataFailed (Mac48Address address, const WifiMacH
   station->m_slrc++;
   m_macTxDataFailed (address);
   DoReportDataFailed (station);
+  static const char *ac[] = {"AC_BE", "AC_BK", "AC_VI", "AC_VO", "AC_BE_NQOS", "???"};
+  int index = header->IsQosData() ? QosUtilsMapTidToAc(header->GetQosTid()) : 5;
+  int seq = getSeq(packet);
+  std::cout << "RE: " << "ac = " << ac[index] << ", seq = " << seq << ", num = " << station->m_slrc << std::endl;
 }
 
 void
@@ -755,7 +779,7 @@ WifiRemoteStationManager::ReportFinalRtsFailed (Mac48Address address, const Wifi
 }
 
 void
-WifiRemoteStationManager::ReportFinalDataFailed (Mac48Address address, const WifiMacHeader *header)
+WifiRemoteStationManager::ReportFinalDataFailed (Mac48Address address, const WifiMacHeader *header, const Ptr<const Packet> packet)
 {
   NS_LOG_FUNCTION (this << address << *header);
   NS_ASSERT (!address.IsGroup ());
@@ -764,6 +788,10 @@ WifiRemoteStationManager::ReportFinalDataFailed (Mac48Address address, const Wif
   station->m_slrc = 0;
   m_macTxFinalDataFailed (address);
   DoReportFinalDataFailed (station);
+  static const char *ac[] = {"AC_BE", "AC_BK", "AC_VI", "AC_VO", "AC_BE_NQOS", "???"};
+  int index = header->IsQosData() ? QosUtilsMapTidToAc(header->GetQosTid()) : 5;
+  int seq = getSeq(packet);
+  std::cout << "CA: " << "ac = " << ac[index] << ", seq = " << seq << std::endl;
 }
 
 void
diff --git a/src/wifi/model/wifi-remote-station-manager.h b/src/wifi/model/wifi-remote-station-manager.h
index e6136cc..bda2b27 100644
--- a/src/wifi/model/wifi-remote-station-manager.h
+++ b/src/wifi/model/wifi-remote-station-manager.h
@@ -437,7 +437,7 @@ public:
    * \param address the address of the receiver
    * \param header MAC header of the DATA packet
    */
-  void ReportDataFailed (Mac48Address address, const WifiMacHeader *header);
+  void ReportDataFailed (Mac48Address address, const WifiMacHeader *header, const Ptr<const Packet> packet);
   /**
    * Should be invoked whenever we receive the Cts associated to an RTS
    * we just sent. Note that we also get the SNR of the RTS we sent since
@@ -478,7 +478,7 @@ public:
    * \param address the address of the receiver
    * \param header MAC header of the DATA packet
    */
-  void ReportFinalDataFailed (Mac48Address address, const WifiMacHeader *header);
+  void ReportFinalDataFailed (Mac48Address address, const WifiMacHeader *header, const Ptr<const Packet> packet);
 
   /**
    * \param address remote address