ns3 模拟无线网络通信
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#include "ns3/core-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/network-module.h"
#include "ns3/applications-module.h"
#include "ns3/wifi-module.h"
#include "ns3/mobility-module.h"
#include "ns3/csma-module.h"
#include "ns3/internet-module.h"
using namespace ns3;
NS_LOG_COMPONENT_DEFINE ("ThirdScriptExample");
int
main (int argc, char *argv[])
{
Time::SetResolution (Time::NS);
bool verbose = true;
uint32_t nWifi = 3; //设置 无线站点个数
bool tracing = false;
CommandLine cmd;
cmd.AddValue ("nWifi", "Number of wifi STA devices", nWifi);
cmd.AddValue ("verbose", "Tell echo applications to log if true", verbose);
//用命令行修改参数
cmd.Parse (argc,argv);
if (nWifi > 250)
{
std::cout << "Too many wifi or csma nodes, no more than 250 each." << std::endl;
return 1;
}
if (verbose)
{
LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_ALL);
LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_ALL);
}
NodeContainer wifiStaNodes;
wifiStaNodes.Create (nWifi); //创建无线站点STA的节点
NodeContainer wifiApNode;
wifiApNode.Create(1); //创建一个AP节点
YansWifiChannelHelper channel = YansWifiChannelHelper::Default (); //使用默认的信道模型
YansWifiPhyHelper phy = YansWifiPhyHelper::Default (); //使用默认的PHY模型
phy.SetChannel (channel.Create ()); //创建通道对象并把他关联到物理层对象管理器
WifiHelper wifi;
wifi.SetRemoteStationManager ("ns3::AarfWifiManager"); //设置wifi助手用AARF速率控制算法
//配置Mac类型以及基础设置SSID
WifiMacHelper mac;
Ssid ssid = Ssid ("ns-3-aqiao"); //设置SSID的名字为ns-3-aqiao
mac.SetType ("ns3::StaWifiMac", //指定mac层指定为ns3::StaWifiMac
"Ssid", SsidValue (ssid), //设置默认AP是ssid对象
"ActiveProbing", BooleanValue (false)); //设置不会发出主动探测AP的指令，默认AP是ssid
NetDeviceContainer staDevices;
staDevices = wifi.Install (phy, mac, wifiStaNodes); //在MAC层和PHY层用以前安装方法来创建这些无线设备
mac.SetType ("ns3::ApWifiMac", //指定为AP
"Ssid", SsidValue (ssid));
NetDeviceContainer apDevices;
apDevices = wifi.Install (phy, mac, wifiApNode); //一起共享PHY层的属性
// 加入移动模型，让STA可以移动，AP固定
MobilityHelper mobility;
mobility.SetPositionAllocator ("ns3::GridPositionAllocator",
"MinX", DoubleValue (0.0),
"MinY", DoubleValue (0.0),
"DeltaX", DoubleValue (5.0),
"DeltaY", DoubleValue (10.0),
"GridWidth", UintegerValue (3),
"LayoutType", StringValue ("RowFirst"));
//设置初始时，节点的摆放位置
mobility.SetMobilityModel ("ns3::RandomWalk2dMobilityModel", //设置移动模式为"ns3::RandomWalk2dMobilityModel"，随机移动
"Bounds", RectangleValue (Rectangle (-50, 50, -50, 50))); //移动范围
mobility.Install (wifiStaNodes);
mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel"); //设置AP的不能够移动的，"ns3::ConstantPositionMobilityModel"
mobility.Install (wifiApNode);
InternetStackHelper stack;
stack.Install (wifiApNode);
stack.Install (wifiStaNodes); //安装协议栈
Ipv4AddressHelper address;
address.SetBase ("10.1.3.0", "255.255.255.0");
Ipv4InterfaceContainer wifiInterfaces;
wifiInterfaces=address.Assign (staDevices);
address.Assign (apDevices); //地址分配
//安装暗涌程序，使用UDP，与之前的UDP的使用方法一致
UdpEchoServerHelper echoServer (9);
ApplicationContainer serverApps = echoServer.Install (wifiStaNodes.Get (0));
serverApps.Start (Seconds (1.0));
serverApps.Stop (Seconds (10.0));
UdpEchoClientHelper echoClient (wifiInterfaces.GetAddress (0), 9);
echoClient.SetAttribute ("MaxPackets", UintegerValue (5));
echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.0)));
echoClient.SetAttribute ("PacketSize", UintegerValue (1024));
ApplicationContainer clientApps =
echoClient.Install (wifiStaNodes.Get (nWifi - 1));
clientApps.Start (Seconds (2.0));
clientApps.Stop (Seconds (10.0));
Ipv4GlobalRoutingHelper::PopulateRoutingTables ();
Simulator::Stop (Seconds (10.0));
phy.EnablePcap ("wifiwifi", apDevices.Get (0));
Simulator::Run ();
Simulator::Destroy ();
return 0;
}
输出结果
发现与之前的UDP传送成功。
利用该命令可以，可以查看代码中更详细pcap内容
这个部分主要完成的是各个STA接入AP的控制信息，由于无线网络中，并不能确定信息是否收发成功，所以一定要接受到一个ACK，表示数据发送成功
接下来是ARP协议通过 IP地址去得到对方的MAC地址，以便于后面可以实现基于mac层的802.11数据传输
已经得到了MAC地址后，后面就不需要再进行ARP的询问了。
通过VIS得到的可视化结果
