ns-3 - 如何在 NS-3 中使用 TCP 获取丢失数据包的数量?(80211n + MIMO 示例)
问题描述
我正在使用这个例子:https ://github.com/nsnam/ns-3-dev-git/blob/master/examples/wireless/80211n-mimo.cc 。对于 UDP,在 UdpServer 中有一个名为“GetLost()”的函数,它返回丢失的数据包的数量,但对于 TCP,没有。请问有没有办法解决这个问题。谢谢
/* Setting applications */
ApplicationContainer serverApp;
if (udp)
{
//UDP flow
uint16_t port = 9;
UdpServerHelper server (port);
serverApp = server.Install (wifiStaNode.Get (0));
serverApp.Start (Seconds (0.0));
serverApp.Stop (Seconds (simulationTime + 1));
UdpClientHelper client (staNodeInterface.GetAddress (0), port);
client.SetAttribute ("MaxPackets", UintegerValue (4294967295u));
client.SetAttribute ("Interval", TimeValue (Time ("0.00001"))); //packets/s
client.SetAttribute ("PacketSize", UintegerValue (payloadSize));
ApplicationContainer clientApp = client.Install (wifiApNode.Get (0));
clientApp.Start (Seconds (1.0));
clientApp.Stop (Seconds (simulationTime + 1));
}
else
{
//TCP flow
uint16_t port = 50000;
Address localAddress (InetSocketAddress (Ipv4Address::GetAny (), port));
PacketSinkHelper packetSinkHelper ("ns3::TcpSocketFactory", localAddress);
serverApp = packetSinkHelper.Install (wifiStaNode.Get (0));
serverApp.Start (Seconds (0.0));
serverApp.Stop (Seconds (simulationTime + 1));
OnOffHelper onoff ("ns3::TcpSocketFactory",Ipv4Address::GetAny ());
onoff.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));
onoff.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));
onoff.SetAttribute ("PacketSize", UintegerValue (payloadSize));
onoff.SetAttribute ("DataRate", DataRateValue (1000000000)); //bit/s
AddressValue remoteAddress (InetSocketAddress (staNodeInterface.GetAddress (0), port));
onoff.SetAttribute ("Remote", remoteAddress);
ApplicationContainer clientApp = onoff.Install (wifiApNode.Get (0));
clientApp.Start (Seconds (1.0));
clientApp.Stop (Seconds (simulationTime + 1));
}
Simulator::Stop (Seconds (simulationTime + 1));
Simulator::Run ();
uint64_t nb = 0;
uint64_t lost = 0;
if (udp)
{
//UDP
nb = DynamicCast<UdpServer> (serverApp.Get (0))->GetReceived ();
lost = DynamicCast<UdpServer> (serverApp.Get (0))->GetLost();
double window = DynamicCast<UdpServer> (serverApp.Get (0))->GetPacketWindowSize();
std::cout << "Window Size :" << window << std::endl;
}
else
{
//TCP
uint64_t totalPacketsThrough = DynamicCast<PacketSink> (serverApp.Get (0))->GetTotalRx ();
nb = totalPacketsThrough / payloadSize ;
/*need help here to get the number of lost packets using TCP Thanks*/
}
dataset1.Add (d, nb);
dataset2.Add (d, lost);
std::cout << nb << " Received packets" << std::endl;
std::cout << lost << " Lost packets" << std::endl;
d += step;
Simulator::Destroy ();
}
plot1.AddDataset (dataset1);
plot2.AddDataset (dataset2);
}
解决方案
每次传输数据包时,使用 OnOffApplication 的“Tx”跟踪调用函数 -
void SourceUdpTrace(Ptr<const Packet> pkt)
{
nPacketsSent++;
}
在 main() 中,使用以下 Config::Connect 语句设置跟踪并将其与SourceUdpTrace
. 该语句必须放在前面Simulator::Run()
Config::ConnectWithoutContext("/NodeList/*/ApplicationList/*/$ns3::ManualOnOffApp/Tx",MakeCallback(&SourceUdpTrace));
一旦您知道发送数据包的数量,您可以通过比较它的值轻松确定丢失数据包的数量nb
,如您的代码行所发现的 -nb = totalPacketsThrough / payloadSize;
推荐阅读
- wxpython - 文件类型通配符多个句点 OSX
- typescript - 有没有办法描述 TypeScript 中两个参数之间的关系?
- service-worker - service-worker.js 中未捕获的 promise DOM 异常
- python-3.x - 为 max(max(x, key=len )) 和 max( max(i) for i in x) 获得不同的结果
- azure-devops - Power BI Desktop 中消失的关系
- reactjs - 如果反应组件重新渲染是否意味着该组件中的所有代码都重新运行?
- git - vimdiff 不能用作 'vim'
- raspberry-pi3 - 将 3 个树莓派连接到 VNC
- python - 检查文本文件的内容,如果不存在则添加内容
- python - “单击按钮后 GUI 变得无响应”