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How to Implement Network Congestion Control in OMNeT++

To implement the network congestion control within OMNeT++ has contains numerous steps that comprise setting up the simulation environment, executing congestion control mechanisms, identifying traffic patterns, and describing network components. Given below is a process on how to implement network congestion control in OMNeT++:

Step-by-Step Implementations:

  1. Set up OMNeT++ and INET Framework
  • Make sure OMNeT++ and the INET framework are installed and appropriately set up.
  • Build a new project in OMNeT++ and contain the INET framework to leverage its network modules and tools.
  1. Define the Network Topology
  • Generate the network topology using a .ned file, describing nodes like routers, hosts, and the connections among them. For instance:

network CongestionControlNetwork {

submodules:

router1: Router {

@display(“p=100,100”);

}

router2: Router {

@display(“p=200,100”);

}

host1: StandardHost {

@display(“p=50,200”);

}

host2: StandardHost {

@display(“p=250,200”);

}

connections:

router1.pppg++ <–> Ethernet10G <–> router2.pppg++;

host1.ethg++ <–> Ethernet100M <–> router1.pppg++;

host2.ethg++ <–> Ethernet100M <–> router2.pppg++;

}

  1. Specify Traffic Patterns
  • Use applications sych as TCP or UDP to make network traffic among nodes. State these in the .ini file:

[Config CongestionControl]

network = CongestionControlNetwork

sim-time-limit = 100s

*.host1.numApps = 1

*.host1.app[0].typename = “TcpBasicClientApp”

*.host1.app[0].connectAddress = “host2”

*.host1.app[0].connectPort = 1234

*.host1.app[0].tOpen = 0s

*.host1.app[0].tClose = 100s

*.host1.app[0].sendBytes = 10000B

*.host2.numApps = 1

*.host2.app[0].typename = “TcpBasicServerApp”

*.host2.app[0].localPort = 1234

  1. Implement Congestion Control Algorithms
  • Execute congestion control by configuring TCP parameters or using existing congestion control algorithms offered by the INET framework. We can also make custom algorithms by extending existing modules.
  • General congestion control algorithms comprise TCP Reno, TCP NewReno, TCP Vegas, etc.

For instance, configuring TCP NewReno:

*.host1.tcp.tcpAlgorithmClass = “TcpNewReno”

*.host2.tcp.tcpAlgorithmClass = “TcpNewReno”

  • If we need to execute a custom congestion control algorithm, we will want to extend the TcpBaseAlg class or other related classes in OMNeT++.
  1. Monitor and Control Congestion
  • We can observe congestion by viewing metrics like throughput, packet loss, delay, and queue lengths.
  • Modify parameters like buffer sizes, TCP window size, and congestion thresholds to handle congestion.
  • We may also execute Active Queue Management (AQM) techniques such as Random Early Detection (RED) to control congestion:

*.router1.queue.typename = “RED”

*.router1.queue.minTh = 5

*.router1.queue.maxTh = 15

*.router1.queue.wq = 0.002

*.router1.queue.maxP = 0.1

  1. Run the Simulation
  • Run the simulation in OMNeT++ and monitor the behaviour of the network under the congestion control mechanisms we have executed.
  • To visualize network performance using OMNeT++’s built-in analysis tools.
  1. Analyse the Results
  • Analyse the gathered data to know the efficiency of the congestion control algorithm.
  • Investigate metrics like throughput, packet loss, latency, and fairness to estimate the performance.
  1. Optimization and Fine-Tuning
  • Fine-tune the parameters of the congestion control algorithm, based on the analysis.
  • Test with various network topologies, traffic patterns, and congestion control settings to optimize performance.
  1. Documentation
  • Document the execution process, the configurations we used, and the outcomes attained to enable more experimentation or sharing with others.
  1. Extend and Customize
  • Think through extending the simulation by implementing more advanced congestion control methods, like those used in modern networks such as BBR, CUBIC.
  • We can also insert various traffic scenarios to learn the robustness and adaptability of the congestion control mechanisms.

Over this module, we had explained about how to execute the network Congestion Control within OMNeT++. We shall offered numerous details as per your requests.

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