VANET仿真-ns3(2)

VANET 仿真

ns3示例代码second.cc注释整理,总线网络拓扑仿真,拓扑结构如下:

    10.1.1.0
n0 -------------- n1   n2   n3   n4
    point-to-point  |    |    |    |
                    ================
                  LAN 10.1.2.0

#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"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("SecondScriptExample");

int
main (int argc, char \*argv[])
{
bool verbose = true; //启用日志的参数
uint32_t nCsma = 3; //附加节点

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; //保证附加节点至少为1个

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);

//这里给网络设备与CSMA设备部署ipv4地址的方法是相同的
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));

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

//路由配置,对用户是不可见的,节点可以直接访问路由表
Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

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

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

注:在netanim-module下,修改代码如下,确定节点位置,方便利用.xml文件查看动态效果。


#include "ns3/netanim-module.h"

........
......
..

AnimationInterface anim("second.xml");
anim.SetConstantPosition(p2pNodes.Get(0), 10, 10);
anim.SetConstantPosition(p2pNodes.Get(1), 50, 50);
//anim.SetConstantPosition(csmaNodes.Get(0), 25, 0);
anim.SetConstantPosition(csmaNodes.Get(1), 40, 0);
anim.SetConstantPosition(csmaNodes.Get(2), 30, 10);
anim.SetConstantPosition(csmaNodes.Get(3), 20, 20);
Simulator::Run ();
Simulator::Destroy ();
return 0;

仿真效果如下