To implement network emergency message dissemination in ns3, by setting up a network simulation in which the nodes can broadcast emergency messages efficiently. This concept mainly focus on setting up the network topology, configuring the communication protocols, and implementing the logic for disseminating emergency messages.
Below given steps will guide on how to implement network emergency message dissemination in ns3.
Step-by-step guide to implement network emergency message dissemination in ns3:
Step 1: Setup ns3 Environment
Ensure ns3 is installed and set up on the system.
Step 2: Include Necessary Modules
Include the necessary ns3 modules in the script:
#include “ns3/core-module.h”
#include “ns3/network-module.h”
#include “ns3/mobility-module.h”
#include “ns3/wifi-module.h”
#include “ns3/internet-module.h”
#include “ns3/applications-module.h”
Step 3: Create the Simulation Script
- Setup Nodes and Network:
using namespace ns3;
NS_LOG_COMPONENT_DEFINE (“EmergencyMessageDissemination”);
class EmergencyBroadcastApp : public Application
{
public:
EmergencyBroadcastApp ();
virtual ~EmergencyBroadcastApp ();
void Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate);
private:
virtual void StartApplication (void);
virtual void StopApplication (void);
void ScheduleTx (void);
void SendPacket (void);
Ptr<Socket> m_socket;
Address m_peer;
uint32_t m_packetSize;
uint32_t m_nPackets;
DataRate m_dataRate;
EventId m_sendEvent;
bool m_running;
uint32_t m_packetsSent;
};
EmergencyBroadcastApp::EmergencyBroadcastApp ()
: m_socket (0),
m_peer (),
m_packetSize (0),
m_nPackets (0),
m_dataRate (0),
m_sendEvent (),
m_running (false),
m_packetsSent (0)
{
}
EmergencyBroadcastApp::~EmergencyBroadcastApp ()
{
m_socket = 0;
}
void
EmergencyBroadcastApp::Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate)
{
m_socket = socket;
m_peer = address;
m_packetSize = packetSize;
m_nPackets = nPackets;
m_dataRate = dataRate;
}
void
EmergencyBroadcastApp::StartApplication (void)
{
m_running = true;
m_packetsSent = 0;
m_socket->Bind ();
m_socket->Connect (m_peer);
SendPacket ();
}
void
EmergencyBroadcastApp::StopApplication (void)
{
m_running = false;
if (m_sendEvent.IsRunning ())
{
Simulator::Cancel (m_sendEvent);
}
if (m_socket)
{
m_socket->Close ();
}
}
void
EmergencyBroadcastApp::SendPacket (void)
{
Ptr<Packet> packet = Create<Packet> (m_packetSize);
m_socket->Send (packet);
if (++m_packetsSent < m_nPackets)
{
ScheduleTx ();
}
}
void
EmergencyBroadcastApp::ScheduleTx (void)
{
if (m_running)
{
Time tNext (Seconds (m_packetSize * 8 / static_cast<double> (m_dataRate.GetBitRate ())));
m_sendEvent = Simulator::Schedule (tNext, &EmergencyBroadcastApp::SendPacket, this);
}
}
int main (int argc, char *argv[])
{
CommandLine cmd;
cmd.Parse (argc, argv);
NodeContainer nodes;
nodes.Create (10);
WifiHelper wifi;
wifi.SetStandard (WIFI_PHY_STANDARD_80211b);
YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();
YansWifiChannelHelper wifiChannel;
wifiChannel.SetPropagationDelay (“ns3::ConstantSpeedPropagationDelayModel”);
wifiChannel.AddPropagationLoss (“ns3::FriisPropagationLossModel”);
wifiPhy.SetChannel (wifiChannel.Create ());
WifiMacHelper wifiMac;
wifi.SetRemoteStationManager (“ns3::ConstantRateWifiManager”, “DataMode”, StringValue (“DsssRate1Mbps”), “ControlMode”, StringValue (“DsssRate1Mbps”));
wifiMac.SetType (“ns3::AdhocWifiMac”);
NetDeviceContainer devices = wifi.Install (wifiPhy, wifiMac, nodes);
MobilityHelper mobility;
mobility.SetPositionAllocator (“ns3::GridPositionAllocator”,
“MinX”, DoubleValue (0.0),
“MinY”, DoubleValue (0.0),
“DeltaX”, DoubleValue (5.0),
“DeltaY”, DoubleValue (10.0),
“GridWidth”, UintegerValue (5),
“LayoutType”, StringValue (“RowFirst”));
mobility.SetMobilityModel (“ns3::ConstantPositionMobilityModel”);
mobility.Install (nodes);
InternetStackHelper internet;
internet.Install (nodes);
Ipv4AddressHelper ipv4;
ipv4.SetBase (“10.1.1.0”, “255.255.255.0”);
Ipv4InterfaceContainer interfaces = ipv4.Assign (devices);
TypeId tid = TypeId::LookupByName (“ns3::UdpSocketFactory”);
Ptr<Socket> recvSink = Socket::CreateSocket (nodes.Get (1), tid);
InetSocketAddress local = InetSocketAddress (Ipv4Address::GetAny (), 80);
recvSink->Bind (local);
recvSink->SetRecvCallback (MakeCallback (&ReceivePacket));
Ptr<Socket> source = Socket::CreateSocket (nodes.Get (0), tid);
InetSocketAddress remote = InetSocketAddress (Ipv4Address (“255.255.255.255”), 80);
source->SetAllowBroadcast (true);
source->Connect (remote);
Ptr<EmergencyBroadcastApp> app = CreateObject<EmergencyBroadcastApp> ();
app->Setup (source, remote, 1024, 100, DataRate (“1Mbps”));
nodes.Get (0)->AddApplication (app);
app->SetStartTime (Seconds (1.0));
app->SetStopTime (Seconds (10.0));
Simulator::Stop (Seconds (10.0));
Simulator::Run ();
Simulator::Destroy ();
return 0;
}
Receive Packet Callback: Implement the callback function to handle the reception of packets.
void ReceivePacket (Ptr<Socket> socket)
{
Ptr<Packet> packet;
Address from;
while ((packet = socket->RecvFrom (from)))
{
NS_LOG_UNCOND (“Received one packet!”);
}
}
Run the Simulation: Compile and run your simulation script:
./waf configure
./waf build
./waf –run EmergencyMessageDissemination
Explanation:
- Node Creation: Create nodes representing devices in the network.
- Wi-Fi Setup: Configure Wi-Fi for communication between nodes.
- Mobility: Set constant positions for nodes to represent their locations.
- Internet Stack: Install the Internet stack on all nodes.
- IP Configuration: Assign IP addresses to the nodes.
- Applications: Use a custom application to broadcast emergency messages. Implement the EmergencyBroadcastApp class to handle the sending of broadcast packets. Implement the ReceivePacket function to handle the reception of packets.
Advanced Techniques for Emergency Message Dissemination
- Dynamic Topology: Implement mobility models to simulate dynamic topologies, such as vehicles in a VANET scenario.
mobility.SetMobilityModel (“ns3::RandomWaypointMobilityModel”);
mobility.Install (nodes);
Adaptive Broadcast Rate: Adjust the broadcast rate based on network conditions.
void AdjustBroadcastRate (Ptr<Socket> socket, DataRate newRate)
{
// Implement logic to adjust the broadcast rate
}
// Schedule the adjustment
Simulator::Schedule (Seconds (5.0), &AdjustBroadcastRate, source, DataRate (“500kbps”));
Network Monitoring: Use flow monitors or tracing to monitor network performance.
AsciiTraceHelper ascii;
wifiPhy.EnableAsciiAll (ascii.CreateFileStream (“wifi-trace.tr”));
FlowMonitorHelper flowmon;
Ptr<FlowMonitor> monitor = flowmon.InstallAll ();
Finally, we all get to know how to implement network emergency message dissemination in ns3 by simulating the nodes to broadcast emergency messages efficiently. Also, discussed about the advanced techniques for emergency message dissemination. For more implementation help on your required area you can connect with us.