To simulate a Partial Mesh Topology in OMNeT++ has needs to generate a network in which some nodes are completely associated since others are only linked to a subset of nodes. A partial mesh topology integrates the redundancy and fault tolerance of a full mesh network with the simplicity and cost efficiency of a point-to-point or star topology. Visit phdprime.com and share your information. We will provide you with top-notch simulation support for your projects.
Here’s a step-by-step guide to simulating a partial mesh topology in OMNeT++ using the INET framework:
Steps to Simulate a Partial Mesh Topology in OMNeT++
- Install OMNeT++ and INET Framework:
Ensure OMNeT++ and the INET framework is installed. INET deliver the prerequisite network models and utilities for configure network topologies.
- Download and install OMNeT++.
- Download and install the INET Framework.
- Define Partial Mesh Topology in NED File:
In a partial mesh topology, not all nodes are associated to each other. Some nodes have more connections than others, nevertheless redundancy is still preserved.
Here is an example of a simple NED file that describes a partial mesh topology:
network PartialMeshNetwork
{
parameters:
int numNodes = default(6); // Number of nodes in the partial mesh
submodules:
// Define the nodes in the network
node[numNodes]: <NodeType> {
@display(“p=100+100*i,100+100*j”); // Distribute nodes in a scattered fashion
}
connections allowunconnected:
// Manually define connections between nodes to form a partial mesh
node[0].ethg++ <–> Eth100M <–> node[1].ethg++; // Connection between Node 0 and Node 1
node[0].ethg++ <–> Eth100M <–> node[2].ethg++; // Connection between Node 0 and Node 2
node[1].ethg++ <–> Eth100M <–> node[3].ethg++; // Connection between Node 1 and Node 3
node[2].ethg++ <–> Eth100M <–> node[4].ethg++; // Connection between Node 2 and Node 4
node[3].ethg++ <–> Eth100M <–> node[5].ethg++; // Connection between Node 3 and Node 5
node[4].ethg++ <–> Eth100M <–> node[5].ethg++; // Connection between Node 4 and Node 5
}
In this example:
- numNodes describes the number of nodes in the partial mesh network.
- The node[numNodes] array describes the nodes in the network.
- ethg++ signifies Ethernet gates (ports) that connect nodes, and Eth100M is a 100 Mbps Ethernet link.
- Some nodes have more connections than others, forming a partial mesh.
- Define Node Types in NED:
We need to use the INET framework’s StandardHost module for the nodes, or generate custom nodes according to the application requirements.
Example of defining a custom node type:
import inet.node.inet.StandardHost;
module NodeType extends StandardHost
{
parameters:
@display(“i=device/laptop”); // Use a laptop icon for the nodes
}
This node type describes each node by way of a standard host in the INET framework with basic networking capabilities.
- Configure the INI File:
In the omnetpp.ini file, we can describe simulation parameters like traffic patterns, the number of nodes, and simulation duration.
Here’s a sample configuration for configure a simple traffic pattern in the partial mesh topology:
network = PartialMeshNetwork
sim-time-limit = 30s # Simulation time limit
# Configuring IP addresses for the nodes in the partial mesh network
*.node[*].networkLayer.ipv4.address = “10.0.0.x”
# Configuring TCP traffic between Node 0 and Node 5
*.node[0].numApps = 1
*.node[5].numApps = 1
# Define a TCP client on Node 0 and a TCP server on Node 5
*.node[0].app[0].typename = “TcpBasicClientApp”
*.node[0].app[0].connectAddress = “10.0.0.5” # Node 5’s IP address
*.node[0].app[0].startTime = 1s
*.node[0].app[0].stopTime = 29s
*.node[5].app[0].typename = “TcpBasicServerApp” # TCP server on Node 5
In this configuration:
- IP addresses are assigned systematically to each node.
- A TCP client is generated on Node 0, sending data to a TCP server running on Node 5.
- The simulation runs for 30 seconds.
- Traffic Generation with UDP or TCP:
If we prefer using UDP for traffic rather than TCP, here’s how to configure UDP traffic in the INI file:
# Configuring UDP traffic from Node 0 to Node 5
*.node[0].app[0].typename = “UdpBasicApp”
*.node[0].app[0].destAddresses = “10.0.0.5” # IP address of Node 5
*.node[0].app[0].destPort = 5000
*.node[0].app[0].packetLength = 1024B
*.node[0].app[0].sendInterval = uniform(1s, 2s)
*.node[0].app[0].startTime = 1s
*.node[0].app[0].stopTime = 29s
# Configure Node 5 as a UDP sink to receive packets
*.node[5].app[0].typename = “UdpSink”
*.node[5].app[0].localPort = 5000
This configuration generates UDP traffic among Node 0 and Node 5, with a randomly distributed interval among packet transmissions.
- Run the Simulation:
- Open OMNeT++ IDE.
- Import and compile the project.
- Execute the simulation using Qtenv to envision the partial mesh topology and track packet transmissions.
- We can see how traffic flows among the nodes, taking benefits of the mesh’s flexibility for rerouting and redundancy.
- Analyse the Results:
OMNeT++ delivers built-in tools to gather and evaluate the simulation data. We can monitor:
- Throughput: The amount of data successfully routed among nodes.
- Latency: Evaluate the delay in packet delivery among nodes.
- Packet Loss: observe packets that fail to reach their destination.
Utilize Plove or Scave to envision these parameters and plot the graphs for further evaluation.
- Advanced Features (Optional):
We need to expand the simulation by adding more characteristics to implement real-world conditions:
- Error Models: Establish errors or packet loss models to replicate unreliable links in the partial mesh network.
- Energy Models: Utilize energy models from INET to monitor battery usage in wireless mesh nodes.
- Mobility Models: implement mobility to particular nodes to replicate dynamic environments such as mobile mesh networks.
Here is how we can add a mobility model:
*.node[*].mobility.typename = “RandomWaypointMobility”
*.node[*].mobility.speed = uniform(1mps, 5mps)
Summary:
- Topology Definition: Utilize NED to generate a partial mesh topology by manually connecting priortized nodes.
- Node Configuration: Utilize INET’s StandardHost for nodes or describes custom node types according to your requirements.
- Traffic Configuration: Set up TCP or UDP traffic among nodes in the omnetpp.ini file.
- Run and Analyse: Execute the simulation, and utilize OMNeT++’s tools to measure throughput, latency, and packet loss.
The above the detailed project about partial mesh topology that was simulated and executed using OMNeT++ tool and it has contain sample codes, detailed explanation about advanced features and provide the overall summary regarding this project. Further details will be added later.
