To simulate the Hybrid Wireless Mesh Protocol (HWMP) in OMNeT++ has needs to follow numerous steps and it includes comparable steps to other protocol simulations such as DYMO, nevertheless with exact configurations for HWMP. The HWMP protocol is mainly utilized in IEEE 802.11s mesh networks.
Here is a step-by-step guide to simulating HWMP in OMNeT++ using the INET framework.
Steps to Simulate HWMP Protocol Projects in OMNeT++
Step 1: Install OMNeT++ and INET Framework
Ensure that OMNeT++ and the INET framework are installed and appropriately configured. The INET framework has contained implementations of numerous networking protocols, that involves IEEE 802.11s and HWMP.
- Download OMNeT++: OMNeT++
- Download INET Framework: INET official page
Step 2: Enable IEEE 802.11s and HWMP in INET
HWMP is part of the IEEE 802.11s standard for wireless mesh networks that is available in the INET framework. The protocol is configured for devices that perform in a mesh network.
- Open the omnetpp.ini configuration file and set the network configuration to utilize the HWMP routing protocol.
- Allow the IEEE 802.11s mode in the wireless interface of each node.
- Make sure that the Mac80211Mesh module is setup to utilize HWMP by way of the routing protocol.
Here is a sample of configuring HWMP in omnetpp.ini:
# Example configuration for HWMP (Hybrid Wireless Mesh Protocol)
[Config HWMPMesh]
network = MeshNetwork
sim-time-limit = 1000s
**.numNodes = 10 # Set number of mesh nodes
**.node[*].mobility.typename = “StationaryMobility” # Use mobility model, stationary or dynamic
# Configure the wireless interface (802.11s mesh) for each node
**.node[*].wlan[*].typename = “Ieee80211Mesh”
**.node[*].wlan[*].mac.typename = “Ieee80211MeshMac”
**.node[*].wlan[*].mac.meshMode = “Mesh”
**.node[*].wlan[*].mac.routingProtocol = “HWMP” # Set HWMP as the routing protocol
# Set other parameters like transmission power, bitrate, etc.
**.node[*].wlan[*].radio.transmitter.communicationRange = 300m
**.node[*].wlan[*].bitrate = 54Mbps
Step 3: Modify NED Files for the Mesh Network
In the NED file, we need to generate a network of mesh nodes that interacts with each other using HWMP. Here’s an instance of a basic mesh network configuration in the NED file:
network MeshNetwork
{
submodules:
node[10]: WirelessHost { // Create 10 mesh nodes
@display(“p=100,100”);
}
}
In this configuration, the WirelessHost nodes are set up to utilize the 802.11s standard with HWMP routing.
Step 4: Configure Additional Parameters
Additional parameters can be set to fine-tune the performance of the simulation, like packet size, mobility models (if applicable), and the frequency of routing updates.
Example configuration in omnetpp.ini:
# Simulation-specific configurations
*.node[*].wlan[*].radio.transmitter.power = 2mW
*.node[*].wlan[*].mac.retryLimit = 7
*.node[*].mobility.speed = uniform(10mps, 20mps)
*.node[*].wlan[*].mac.hwmpPathSelection = “airtime” # Set HWMP path selection metric
*.node[*].wlan[*].mac.hwmpPreqMaxRetries = 3 # HWMP Path Request retries
*.node[*].wlan[*].mac.hwmpPreqRateLimit = 1s # Rate limit for Path Requests
*.node[*].wlan[*].mac.hwmpPreqTimeout = 0.5s # Timeout for Path Request
Step 5: Run the Simulation
Once the NED files and the omnetpp.ini configurations are ready:
- Build and compile the project using the OMNeT++ IDE.
- Execute the simulation from the OMNeT++ GUI by choosing the configuration (e.g., HWMPMesh).
- Monitor the behaviour of the mesh network nodes as they interact using the HWMP protocol.
Step 6: Analyze Simulation Results
OMNeT++ delivers tools to measure the simulation outcomes that are stored in .sca and .vec files. We can monitor numerous parameters like:
- Packet delivery ratio
- End-to-end delay
- Routing overhead
- Throughput
We can utilize OMNeT++’s outcome evaluation tool to plot these parameters and gain insights into the performance of the HWMP protocol in mesh network.
Step 7: Adjust and Refine
According to the outcomes, we can pull metrics like node mobility, transmission range, or routing protocol environment (e.g., retry limits and timeouts) to monitor diverse characteristics and results in the mesh network.
This project covers numerous applications of Hybrid Wireless Mesh Protocol, from basic implementations in mesh networks to more advanced scenarios using OMNeT++ tool. We plan to deliver more information regarding that project in upcoming manuals.
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