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How to Implement Ultra Reliable Low Latency Communication in ns3

To Implement Ultra Reliable Low Latency Communication (URLLC) in ns-3, a highly reliable communication network should be simulated with very low latency. Our researchers have completed a comprehensive comparative analysis of all facets of Ultra Reliable Low Latency Communication. Please do not hesitate to reach out to us for unparalleled support. This mainly consists on the application such as autonomous vehicles, industrial automation, and remote surgery.

Here the detailed guide given on how to set up a basic URLLC scenario in ns-3.

Step-by-Step Implementation Ultra Reliable Low Latency Communication in ns3

  1. Install ns-3

Ensure that ns3 is installed on the system.

  1. Define the Network Topology

Define the network topology including:

  • URLLC devices (sensors, actuators, etc.)
  • Central server or base station
  1. Create Network Nodes

Create network nodes using NodeContainer.

NodeContainer urllcDevices, serverNode;

urllcDevices.Create(20); // Create 20 URLLC devices

serverNode.Create(1);    // Create 1 server node

4. Set Up Network Devices

Install network devices on the nodes using appropriate network interfaces, such as WiFi or LTE for wireless communication.

Using WiFi

WifiHelper wifi;

wifi.SetStandard(WIFI_PHY_STANDARD_80211n_5GHZ);

WifiMacHelper mac;

mac.SetType(“ns3::AdhocWifiMac”);

YansWifiPhyHelper phy = YansWifiPhyHelper::Default();

YansWifiChannelHelper channel = YansWifiChannelHelper::Default();

phy.SetChannel(channel.Create());

NetDeviceContainer urllcDevicesNet = wifi.Install(phy, mac, urllcDevices);

NetDeviceContainer serverNet = wifi.Install(phy, mac, serverNode);

Using LTE

If you prefer LTE for better reliability and low latency:

Ptr<LteHelper> lteHelper = CreateObject<LteHelper>();

Ptr<PointToPointEpcHelper> epcHelper = CreateObject<PointToPointEpcHelper>();

lteHelper->SetEpcHelper(epcHelper);

Ptr<Node> pgw = epcHelper->GetPgwNode();

NodeContainer enbNodes;

enbNodes.Create(1);

NetDeviceContainer enbDevs = lteHelper->InstallEnbDevice(enbNodes);

NetDeviceContainer urllcDevicesDevs = lteHelper->InstallUeDevice(urllcDevices);

internet.Install(urllcDevices);

internet.Install(serverNode);

Ipv4InterfaceContainer urllcDevicesIpIfaces;

Ipv4StaticRoutingHelper ipv4RoutingHelper;

for (uint32_t i = 0; i < urllcDevices.GetN(); ++i) {

    Ptr<Node> ueNode = urllcDevices.Get(i);

    Ipv4InterfaceContainerueIpIface=epcHelper->AssignUeIpv4Address(NetDeviceContainer(urllcDevicesDevs.Get(i)));

    urllcDevicesIpIfaces.Add(ueIpIface);

    Ptr<Ipv4StaticRouting> ueStaticRouting = ipv4RoutingHelper.GetStaticRouting(ueNode->GetObject<Ipv4>());

    ueStaticRouting->SetDefaultRoute(epcHelper->GetUeDefaultGatewayAddress(), 1);

}

 

lteHelper->Attach(urllcDevicesDevs, enbDevs.Get(0));

5. Configure Mobility Model

Set up the mobility model for the nodes to simulate fixed positions typical in URLLC environments.

MobilityHelper mobility;

mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

mobility.Install(urllcDevices);

mobility.Install(serverNode);

6. Set Up Routing Protocols

Configure routing protocols for the network. For a simple WiFi setup, the default routing provided by the Internet stack should suffice.

InternetStackHelper internet;

internet.Install(urllcDevices);

internet.Install(serverNode);

Ipv4AddressHelper address;

address.SetBase(“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer urllcDevicesInterfaces = address.Assign(urllcDevicesNet);

Ipv4InterfaceContainer serverInterface = address.Assign(serverNet);

7. Implement URLLC Applications

Create applications that simulate URLLC functionalities. Below is an example of a simple application that simulates devices sending critical data to a central server with strict timing requirements.

URLLC Device Application

class URLLCDeviceApplication : public Application {

public:

    void StartApplication() override {

        sendSocket = Socket::CreateSocket(GetNode(), UdpSocketFactory::GetTypeId());

        InetSocketAddress remote = InetSocketAddress(serverAddress, serverPort);

        sendSocket->Connect(remote);

        // Schedule the first data send

        Simulator::Schedule(Seconds(0.1), &URLLCDeviceApplication::SendData, this);

    }

    void SetServerAddress(Ipv4Address address, uint16_t port) {

        serverAddress = address;

        serverPort = port;

    }

    void SendData() {

        std::ostringstream msg;

        msg << “Critical data from URLLC device ” << GetNode()->GetId();

        Ptr<Packet> packet = Create<Packet>((uint8_t*) msg.str().c_str(), msg.str().size());

        sendSocket->Send(packet);

        // Schedule the next data send

        Simulator::Schedule(MilliSeconds(10), &URLLCDeviceApplication::SendData, this);

    }

private:

    Ptr<Socket> sendSocket;

    Ipv4Address serverAddress;

    uint16_t serverPort;

};

Server Application

class ServerApplication : public Application {

public:

    void StartApplication() override {

        recvSocket = Socket::CreateSocket(GetNode(), UdpSocketFactory::GetTypeId());

        recvSocket->Bind(InetSocketAddress(Ipv4Address::GetAny(), localPort));

        recvSocket->SetRecvCallback(MakeCallback(&ServerApplication::HandleRead, this));

    }

    void SetLocalPort(uint16_t port) {

        localPort = port;

    }

    void HandleRead(Ptr<Socket> socket) {

        Ptr<Packet> packet;

        Address from;

        while ((packet = socket->RecvFrom(from))) {

            std::cout << “Server received data from ” << InetSocketAddress::ConvertFrom(from).GetIpv4() << std::endl;

        }

    }

private:

    Ptr<Socket> recvSocket;

    uint16_t localPort;

};

8. Install Applications

Install the applications on the nodes.

ApplicationContainer urllcApps, serverApps;

// Install URLLC device applications

   for (uint32_t i = 0; i < urllcDevices.GetN(); ++i) {

    Ptr<URLLCDeviceApplication> app = CreateObject<URLLCDeviceApplication>();

    app->SetServerAddress(serverNode.Get(0)->GetObject<Ipv4>()->GetAddress(1,   0).GetLocal(), 9);

    urllcDevices.Get(i)->AddApplication(app);

    app->SetStartTime(Seconds(0.1 * i));

    app->SetStopTime(Seconds(20.0));

    urllcApps.Add(app);

  }

// Install server application

Ptr<ServerApplication> serverApp = CreateObject<ServerApplication>();

serverApp->SetLocalPort(9);

serverNode.Get(0)->AddApplication(serverApp);

serverApp->SetStartTime(Seconds(0.0));

serverApp->SetStopTime(Seconds(20.0));

serverApps.Add(serverApp);

9. Run the Simulation

Configure the simulation runtime and execute it.

Simulator::Stop(Seconds(20.0));

Simulator::Run();

Simulator::Destroy();

Example of a Simple URLLC Network Script

Here’s an example script for URLLC implementation:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/wifi-module.h”

#include “ns3/mobility-module.h”

#include “ns3/applications-module.h”

using namespace ns3;

class URLLCDeviceApplication : public Application {

public:

    void StartApplication() override {

        sendSocket = Socket::CreateSocket(GetNode(), UdpSocketFactory::GetTypeId());

        InetSocketAddress remote = InetSocketAddress(serverAddress, serverPort);

        sendSocket->Connect(remote);

        // Schedule the first data send

        Simulator::Schedule(Seconds(0.1), &URLLCDeviceApplication::SendData, this);

    }

    void SetServerAddress(Ipv4Address address, uint16_t port) {

        serverAddress = address;

        serverPort = port;

    }

    void SendData() {

        std::ostringstream msg;

        msg << “Critical data from URLLC device ” << GetNode()->GetId();

        Ptr<Packet> packet = Create<Packet>((uint8_t*) msg.str().c_str(), msg.str().size());

        sendSocket->Send(packet);

        // Schedule the next data send

        Simulator::Schedule(MilliSeconds(10), &URLLCDeviceApplication::SendData, this);

    }

 

private:

    Ptr<Socket> sendSocket;

    Ipv4Address serverAddress;

    uint16_t serverPort;

};

class ServerApplication : public Application {

public:

    void StartApplication() override {

        recvSocket = Socket::CreateSocket(GetNode(), UdpSocketFactory::GetTypeId());

        recvSocket->Bind(InetSocketAddress(Ipv4Address::GetAny(), localPort));

        recvSocket->SetRecvCallback(MakeCallback(&ServerApplication::HandleRead, this));

    }

    void SetLocalPort(uint16_t port) {

        localPort = port;

    }

    void HandleRead(Ptr<Socket> socket) {

        Ptr<Packet> packet;

        Address from;

        while ((packet = socket->RecvFrom(from))) {

            std::cout<<“Serverreceiveddatafrom”<< InetSocketAddress::ConvertFrom(from).GetIpv4() << std::endl;

        }

    }

 

private:

    Ptr<Socket> recvSocket;

    uint16_t localPort;

};

     int main(int argc, char *argv[]) {

    NodeContainer urllcDevices, serverNode;

    urllcDevices.Create(20);

    serverNode.Create(1);

    // WiFi setup

    WifiHelper wifi;

    wifi.SetStandard(WIFI_PHY_STANDARD_80211n_5GHZ);

    WifiMacHelper mac;

    mac.SetType(“ns::AdhocWifiMac”);

    YansWifiPhyHelper phy = YansWifiPhyHelper::Default();

    YansWifiChannelHelper channel = YansWifiChannelHelper::Default();

    phy.SetChannel(channel.Create());

    NetDeviceContainer urllcDevicesNet = wifi.Install(phy, mac, urllcDevices);

    NetDeviceContainer serverNet = wifi.Install(phy, mac, serverNode);

    // Mobility setup

    MobilityHelper mobility;

    mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

    mobility.Install(urllcDevices);

    mobility.Install(serverNode);

    // Internet stack and routing

    InternetStackHelper internet;

    internet.Install(urllcDevices);

    internet.Install(serverNode);

    Ipv4AddressHelper address;

    address.SetBase(“10.1.1.0”, “255.255.255.0”);

    Ipv4InterfaceContainer urllcDevicesInterfaces = address.Assign(urllcDevicesNet);

    Ipv4InterfaceContainer serverInterface = address.Assign(serverNet);

    // Install applications

    ApplicationContainer urllcApps, serverApps;

    // Install URLLC device applications

    for (uint32_t i = 0; i < urllcDevices.GetN(); ++i) {

        Ptr<URLLCDeviceApplication> app = CreateObject<URLLCDeviceApplication>();

        app->SetServerAddress(serverNode.Get(0)->GetObject<Ipv4>()->GetAddress(1, 0).GetLocal(), 9);

        urllcDevices.Get(i)->AddApplication(app);

        app->SetStartTime(Seconds(0.1 * i));

        app->SetStopTime(Seconds(20.0));

        urllcApps.Add(app);

    }

    // Install server application

    Ptr<ServerApplication> serverApp = CreateObject<ServerApplication>();

    serverApp->SetLocalPort(9);

    serverNode.Get(0)->AddApplication(serverApp);

    serverApp->SetStartTime(Seconds(0.0));

    serverApp->SetStopTime(Seconds(20.0));

    serverApps.Add(serverApp);

    Simulator::Stop(Seconds(20.0));

    Simulator::Run();

    Simulator::Destroy();

    return 0;

}

Finally, we had learnt to implement the Ultra Reliable Low latency Communication in ns3 by using highly reliable communication with low latency for the important applications. For good project help on Ultra Reliable Low latency Communication in ns3 you can contact us.