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How to Implement Network Channel Aggregation in OMNeT++

To implement the Network channel aggregation within OMNeT++ has encompasses merging several channels (or links) to rise the obtainable bandwidth for communication among network nodes. In the setup, where a one link cannot offer necessary bandwidth, so several links are aggregated to meet the demand used by this method.

Steps to Implement Network Channel Aggregation in OMNeT++

  1. Install OMNeT++ and INET Framework:
    • Make sure that OMNeT++ and the INET framework are installed. The INET framework delivers necessary components for mimicking network protocols, with those wanted for channel aggregation.
  2. Define the Network Topology:
    • Build a network topology using a .ned file, identifying the nodes that will be connected over aggregated channels.
  3. Implement or Use Existing Aggregation Modules:
    • Execute or use existing modules that manage the aggregation of several channels. This might comprise making a custom application or changing existing protocols to deliver traffic through numerous channels.
  4. Configure Multiple Channels:
    • Define and configure the multiple channels (or links) that will be combined. Every single channel may have various properties, like delay, loss characteristics, and data rate.
  5. Distribute Traffic Across Channels:
    • Execute logic to deliver traffic through the aggregated channels. It can comprise load balancing, separating traffic at the packet level, or using a protocol that integrally supports channel aggregation like Multi-Path TCP.
  6. Configure Simulation Parameters:
    • Use the .ini file to configure the parameters for each channel and the aggregation mechanism.
  7. Run the Simulation and Analyse Results:
    • Implement the simulation and analyse the performance of the channel aggregation. Important metrics to consider comprise throughput, latency, and how successfully the traffic is delivered across the channels.

Example: Implementing Basic Network Channel Aggregation

  1. Define the Network Topology in a .ned File

// ChannelAggregationNetwork.ned

package networkstructure;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

network ChannelAggregationNetwork

{

submodules:

routerA: Router {

@display(“p=100,200”);

}

routerB: Router {

@display(“p=300,200”);

}

connections:

routerA.ppp[0] <–> Channel1 <–> routerB.ppp[0];

routerA.ppp[1] <–> Channel2 <–> routerB.ppp[1];

}

  1. Define the Multiple Channels for Aggregation

Describe the channels that will be aggregated. Each channel can have numerous properties.

channel Channel1 extends ned.DatarateChannel

{

delay = 2ms;

datarate = 10Mbps;

attenuation = 0dB;

}

channel Channel2 extends ned.DatarateChannel

{

delay = 3ms;

datarate = 15Mbps;

attenuation = 0dB;

}

  1. Implement Traffic Distribution Logic

Execute a module that distributes traffic across multiple channels. We can extend an existing module or generate a custom application.

#include <omnetpp.h>

#include <inet/applications/base/ApplicationBase.h>

using namespace omnetpp;

using namespace inet;

class AggregationApp : public ApplicationBase

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

void sendPacketOnChannel(int channelIndex);

public:

virtual int numInitStages() const override { return NUM_INIT_STAGES; }

};

Define_Module(AggregationApp);

void AggregationApp::initialize(int stage)

{

ApplicationBase::initialize(stage);

if (stage == INITSTAGE_APPLICATION_LAYER) {

scheduleAt(simTime() + 1, new cMessage(“sendPacket”));

}

}

void AggregationApp::handleMessageWhenUp(cMessage *msg)

{

if (strcmp(msg->getName(), “sendPacket”) == 0) {

// Send packets on both channels

sendPacketOnChannel(0);

sendPacketOnChannel(1);

scheduleAt(simTime() + 1, msg);  // Re-schedule to send more packets

} else {

delete msg;

}

}

void AggregationApp::sendPacketOnChannel(int channelIndex)

{

cPacket *packet = new cPacket(“DataPacket”);

send(packet, “out”, channelIndex);

}

  1. Modify Node Modules to Use Aggregation Application

Extend the node definition to comprise the aggregation application.

simple Router extends inet.node.inet.Router

{

parameters:

@display(“i=device/router”);

numApps = 1;

app[0].typename = “AggregationApp”;

ppp[0].typename = “inet.linklayer.ppp.PppInterface”;

ppp[1].typename = “inet.linklayer.ppp.PppInterface”;

}

  1. Configure the Simulation in .ini File

# omnetpp.ini

[General]

network = networkstructure.ChannelAggregationNetwork

sim-time-limit = 60s

# Channel configurations

**.ppp[0].queue.typename = “DropTailQueue”;

**.ppp[1].queue.typename = “DropTailQueue”;

# AggregationApp configurations

**.app[0].sendInterval = 1s;

**.app[0].packetLength = 1024B;

  1. Explanation of the Example
  • Network Topology (ChannelAggregationNetwork.ned):
    • The network contains of two routers (routerA and routerB) connected by two parallel channels like Channel1 and Channel2.
    • These channels are aggregated to rise the available bandwidth between the routers.
  • Traffic Distribution (AggregationApp.cc):
    • The AggregationApp module sends packets on both channels. This mimics traffic distribution across several links, which is necessary for channel aggregation.
  • Simulation Configuration (omnetpp.ini):
    • The .ini file configures parameters for the channels and the application, like queue type, send interval, and packet size.

Running the Simulation

  • Compile the project in OMNeT++ IDE and run the simulation.
  • Use OMNeT++’s tools to monitor how traffic is delivered between the aggregated channels and analyse metrics such as throughput and latency.

Extending the Example

  • Dynamic Load Balancing: Execute a more sophisticated algorithm to dynamically balance the load among the channels based on present network conditions.
  • Fault Tolerance: Launch mechanisms to manage the failure of one of the channels and redistribute traffic consequently.
  • Multiple Node Pairs: Expand the instance to contain many node pairs performing channel aggregation, mimicking a more difficult network situation.
  • Integration with Higher Layer Protocols: Incorporate the channel aggregation logic with higher-layer protocols such as TCP, possibly using Multi-Path TCP (MPTCP) for more enhanced traffic management.

From this module, we focused on how to define the topology and how to setup and analyse the Network Channel Aggregation that were implemented using OMNeT++ tool. We will plan to offer the more information concerning this topic in several tool.

OMNeT++ has great support for Network Channel Aggregation, and you can find helpful information at omnet-manual.com. Our skilled developers know a lot about the OMNeT++ program. If you need project ideas or topics, our team is here to help! We assist you with executing your projects and analyzing comparisons. Stay connected with our experts to get the best results and ensure your projects are delivered on time

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