How to Begin Implement Network Migration Time in NS3

To begin implementing and examining the Network Migration Time within ns3, we can adhere to the stepwise mechanism. Migration time denotes the period which needed for transmitting a process, service, or connection from one node or network module to another node. It is specifically related within contexts such as mobile network handovers, service migration within edge computing or virtual machine (VM) migrations in cloud networks. Here’s a detailed guide:

Steps to Begin Implement Network Migration Time in NS3

1. Understand Migration Time

Migration time is computed as:

Tmigration=Ttransfer+TsetupT_{\text{migration}} = T_{\text{transfer}} + T_{\text{setup}}Tmigration​=Ttransfer​+Tsetup​

Where:

• TtransferT_{\text{transfer}}Ttransfer​: It measure time to sending information or state from the source node to the destination node.
• TsetupT_{\text{setup}}Tsetup​: Time for initializing and triggering the service or link at destination node.

2. Set Up Your Environment

We should install new version of ns3 with suitable components like LTE, mmWave, or Point-to-Point according to the scenario.

3. Create the Network Topology

Example: LTE Network with Multiple eNodeBs

NodeContainer enbNodes;

enbNodes.Create(3); // Three eNodeBs

NodeContainer ueNodes;

ueNodes.Create(1); // One mobile user

MobilityHelper mobility;

mobility.SetPositionAllocator(“ns3::GridPositionAllocator”,

“MinX”, DoubleValue(0.0),

“MinY”, DoubleValue(0.0),

“DeltaX”, DoubleValue(500.0), // Distance between eNodeBs

“DeltaY”, DoubleValue(0.0),

“GridWidth”, UintegerValue(3),

“LayoutType”, StringValue(“RowFirst”));

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

mobility.Install(enbNodes);

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

mobility.Install(ueNodes);

Ptr<ConstantVelocityMobilityModel> mob = ueNodes.Get(0)->GetObject<ConstantVelocityMobilityModel>();

mob->SetVelocity(Vector(20.0, 0.0, 0.0)); // UE moving at 20 m/s along the X-axis

4. Configure the Network

We can configure the LTE network:

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

NetDeviceContainer enbDevs = lteHelper->InstallEnbDevice(enbNodes);

NetDeviceContainer ueDevs = lteHelper->InstallUeDevice(ueNodes);

// Attach UE to the first eNodeB

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

5. Simulate Migration Events

Allow migration (handover) with the support of suitable mechanism:

lteHelper->SetHandoverAlgorithmType(“ns3::A2A4RsrqHandoverAlgorithm”);

lteHelper->SetHandoverAlgorithmAttribute(“ServingCellThreshold”, UintegerValue(30));

lteHelper->SetHandoverAlgorithmAttribute(“NeighbourCellOffset”, UintegerValue(1));

6. Track Migration Time

Estimate the migration time utilising trace callbacks:

double migrationStartTime = 0.0;

double migrationEndTime = 0.0;

double migrationTime = 0.0;

void HandoverStartCallback(std::string context, uint64_t imsi, uint16_t cellId, uint16_t targetCellId) {

migrationStartTime = Simulator::Now().GetSeconds();

std::cout << “Handover started for IMSI ” << imsi

<< ” from Cell ” << cellId

<< ” to Cell ” << targetCellId

<< ” at time ” << migrationStartTime << “s\n”;

}

void HandoverEndCallback(std::string context, uint64_t imsi, uint16_t cellId, uint16_t targetCellId) {

migrationEndTime = Simulator::Now().GetSeconds();

migrationTime = migrationEndTime – migrationStartTime;

std::cout << “Handover completed for IMSI ” << imsi

<< ” from Cell ” << cellId

<< ” to Cell ” << targetCellId

<< ” at time ” << migrationEndTime << “s\n”;

std::cout << “Migration Time: ” << migrationTime << ” seconds\n”;

}

// Connect the callbacks

lteHelper->AddHandoverStartCallback(MakeCallback(&HandoverStartCallback));

lteHelper->AddHandoverEndCallback(MakeCallback(&HandoverEndCallback));

7. Generate Traffic

During migration, replicate the continuous traffic for computing the service continuity:

ApplicationContainer serverApps, clientApps;

UdpEchoServerHelper echoServer(9);

serverApps = echoServer.Install(ueNodes.Get(0));

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(Ipv4Address(“7.0.0.1”), 9);

echoClient.SetAttribute(“MaxPackets”, UintegerValue(1000));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(0.01))); // 10ms interval

echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));    // 1KB packets

clientApps = echoClient.Install(ueNodes.Get(0));

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

8. Enable Tracing

ASCII and PCAP Tracing

Record migration events and network activity using ASCII and PCAP:

lteHelper->EnablePhyTraces();

lteHelper->EnableMacTraces();

lteHelper->EnableRlcTraces();

lteHelper->EnablePdcpTraces();

XML Animation

Make use of NetAnim to envision the migration:

AnimationInterface anim(“migration_time.xml”);

9. Experiment with Parameters

• Velocity: Experiment with various UE speeds for monitoring the influence over migration time.
• Handover Algorithm: Test with mechanisms such as A3Rsrp or NoOpHandoverAlgorithm.
• Network Topology: Modify the distance among eNodeBs to impact the handover conditions in network topology.

10. Run the Simulation

At the end, execute the simulation then monitor its outcomes:

Simulator::Run();

Simulator::Destroy();

This guide has been methodically explained regarding Network Migration Time implementation and analysis within NS3 through the above step-by-step procedure along with sample snippets. We are prepared to offer more insights for a deeper grasp of advanced concepts.