ns3泊松流量模型

我想学习ns3，我试图通过使用onofApplication生成Vbr而不是Cbr来修改其中一个示例，但代码不工作，我不知道为什么，你能帮我吗？ns3泊松流量模型

#include "ns3/core-module.h" 
#include "ns3/network-module.h" 
#include "ns3/csma-module.h" 
#include "ns3/internet-module.h" 
#include "ns3/point-to-point-module.h" 
#include "ns3/applications-module.h" 
#include "ns3/ipv4-global-routing-helper.h" 
#include "ns3/random-variable.h" 
#include "ns3/socket-factory.h" 
#include "ns3/udp-socket-factory.h" 
#include "ns3/on-off-helper.h" 
#include "ns3/nstime.h" 


using namespace ns3; 

NS_LOG_COMPONENT_DEFINE ("SecondScriptExample"); 

int 
main (int argc, char *argv[]) 
{ 
    bool verbose = true; 
    uint32_t nCsma = 3; 

    CommandLine cmd; 
    cmd.AddValue ("nCsma", "Number of \"extra\" CSMA nodes/devices", nCsma); 
    cmd.AddValue ("verbose", "Tell echo applications to log if true", verbose); 

    cmd.Parse (argc,argv); 

    if (verbose) 
    { 
     LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_INFO); 
     LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_INFO); 
    } 

    nCsma = nCsma == 0 ? 1 : nCsma; 

    NodeContainer p2pNodes; 
    p2pNodes.Create (2); 

    NodeContainer csmaNodes; 
    csmaNodes.Add (p2pNodes.Get (1)); 
    csmaNodes.Create (nCsma); 

    PointToPointHelper pointToPoint; 
    pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps")); 
    pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms")); 

    NetDeviceContainer p2pDevices; 
    p2pDevices = pointToPoint.Install (p2pNodes); 

    CsmaHelper csma; 
    csma.SetChannelAttribute ("DataRate", StringValue ("100Mbps")); 
    csma.SetChannelAttribute ("Delay", TimeValue (NanoSeconds (6560))); 

    NetDeviceContainer csmaDevices; 
    csmaDevices = csma.Install (csmaNodes); 

    InternetStackHelper stack; 
    stack.Install (p2pNodes.Get (0)); 
    stack.Install (csmaNodes); 

    Ipv4AddressHelper address; 
    address.SetBase ("10.1.1.0", "255.255.255.0"); 
    Ipv4InterfaceContainer p2pInterfaces; 
    p2pInterfaces = address.Assign (p2pDevices); 

    address.SetBase ("10.1.2.0", "255.255.255.0"); 
    Ipv4InterfaceContainer csmaInterfaces; 
    csmaInterfaces = address.Assign (csmaDevices); 

    UdpEchoServerHelper echoServer (9); 

    ApplicationContainer serverApps = echoServer.Install (csmaNodes.Get (nCsma)); 
    serverApps.Start (Seconds (1.0)); 
    serverApps.Stop (Seconds (10.0)); 

    OnOffHelper onOffAP ("ns3::UdpSocketFactory", csmaInterfaces.GetAddress(nCsma)); 
    onOffAP.SetAttribute("PacketSize", UintegerValue(1024)); 
    onOffAP.SetAttribute("OffTime",RandomVariableValue(ExponentialVariable(0.01))); 
    // the packet arrivalrate on AP side is 100 pkt/sec, so we set mean value as 1/100 
    onOffAP.SetAttribute("OnTime",RandomVariableValue(ConstantVariable(0.0001583))); 
    // the constanttime for sending one packet 
    onOffAP.SetAttribute("DataRate", StringValue ("54Mbps")); 

// UdpEchoClientHelper echoClient (csmaInterfaces.GetAddress (nCsma), 9); 
    //echoClient.SetAttribute ("MaxPackets", UintegerValue (1)); 
    //echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.0))); 
    //echoClient.SetAttribute ("PacketSize", UintegerValue (1024)); 

    ApplicationContainer clientApps = onOffAP.Install (p2pNodes.Get (0)); 
    clientApps.Start (Seconds (2.0)); 
    clientApps.Stop (Seconds (10.0)); 

    Ipv4GlobalRoutingHelper::PopulateRoutingTables(); 

    pointToPoint.EnablePcapAll ("second"); 
    csma.EnablePcap ("second", csmaDevices.Get (1), true); 

    Simulator::Run(); 
    Simulator::Destroy(); 
    return 0; 
}

和我得到这个误差

msg="Invalid value for attribute set (OffTime) on ns3::OnOffApplication", file=../src/core/model/object-factory.cc, line=75 
libc++abi.dylib: terminate called without an active exception

来源

2013-03-18 user1653150

其中NS-3是您使用的版本？ – 2013-03-29 16:28:32

我使用的NS3版本3.16 – user1653150 2013-03-31 16:11:18

其实，我试图使用OffTime（NS3 3.13）的指数变量，这对我很好用！ – 2013-04-03 12:00:39

onOffAP.SetAttribute（ “导通时间”，的StringValue（ “NS3 :: ConstantRandomVariable [常量= 4]”））; onOffAP.SetAttribute（“OffTime”，StringValue（“ns3 :: ConstantRandomVariable [Constant = 0]”））;

他们已经从API 3.15开始做了一些改变。看看https://groups.google.com/group/ns-3-users/tree/browse_frm/month/2012-11/be3cd40a0dc9c3a1?rnum=461&start=250&_done=/group/ns-3-users/browse_frm/month/2012-11?start%3D250%26sa%3DN%26&pli=1

或者看看示例代码在http://code.nsnam.org/ns-3-dev/file/eb7335c2423c/examples/wireless/wifi-hidden-terminal.cc

希望设置不工作时间，可以帮助你.. :)

来源

2013-04-15 10:23:31 ak2

ns3泊松流量模型

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