How to Implement Network Packet Scheduling in OMNeT++

To implement the network packet scheduling using OMNeT++ has comprises handling how packets are queued and transferred through the network. This scheduling is vital in networking to make sure develop complete network performance, prioritize specific kinds of traffic, and fair bandwidth distribution. General scheduling algorithms comprise Weighted Fair Queuing (WFQ), Priority Queuing, Round Robin, and First-Come-First-Served (FCFS). Below is a basic procedure helps to executing the network packet scheduling in OMNeT++:

Steps to Implement Network Packet Scheduling in OMNeT++

1. Install OMNeT++ and INET Framework:
   • Make sure that OMNeT++ and the INET framework are installed. This framework offers numerous queue modules and scheduling mechanisms that can be extended or modified for packet scheduling.
2. Define the Network Topology:
   • Make a network topology using a .ned file, identifying the nodes like routers, hosts and their connections. This topology would contain the network elements where packet scheduling shall be applied.
3. Implement or Use Existing Scheduling Algorithms:
   • We can use existing scheduling algorithms delivered by INET, like PriorityQueue, RoundRobinScheduler, or WeightedFairQueue, or execute custom scheduling algorithms if required.
4. Integrate the Scheduling Algorithm into the Network:
   • Allocate the scheduling algorithm into the network interfaces or routers where packet scheduling is essential. This is usually completed at the output queue of network devices.
5. Configure the Simulation Parameters:
   • To form the parameters for the scheduling algorithm, like queue sizes, weights for various traffic classes, and other related parameters by using the .ini file.
6. Run the Simulation and Analyse Results:
   • Perform the simulation and evaluate the performance of the scheduling algorithm. Important metrics comprise throughput, delay, packet loss, and fairness between several traffic kinds.

Example: Implementing Priority Queuing in a Simple Network

1. Define the Network Topology in a .ned File

// PacketSchedulingNetwork.ned

package networkstructure;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

network PacketSchedulingNetwork

{

submodules:

router: Router {

@display(“p=200,200”);

}

hostA: StandardHost {

@display(“p=100,100”);

numApps = 1;

app[0].typename = “UdpBasicApp”;

}

hostB: StandardHost {

@display(“p=300,100”);

numApps = 1;

app[0].typename = “UdpBasicApp”;

}

connections allowunconnected:

hostA.pppg++ <–> Ethernet100m <–> router.pppg++;

hostB.pppg++ <–> Ethernet100m <–> router.pppg++;

}

2. Implement Priority Queueing in the Router

Use INET’s PriorityQueue module to execute priority queuing in the router.

simple PriorityQueueRouter extends Router

{

parameters:

@display(“i=device/router”);

ppp[0].queue.typename = “PriorityQueue”;

ppp[1].queue.typename = “PriorityQueue”;

}

3. Configure the Priority Queue in the .ini File

# omnetpp.ini

[General]

network = networkstructure.PacketSchedulingNetwork

sim-time-limit = 60s

# Application settings

**.hostA.app[0].destAddr = “hostB”;

**.hostA.app[0].destPort = 1000;

**.hostA.app[0].messageLength = 512B;

**.hostA.app[0].sendInterval = exponential(0.01s);

**.hostB.app[0].destAddr = “hostA”;

**.hostB.app[0].destPort = 1000;

**.hostB.app[0].messageLength = 512B;

**.hostB.app[0].sendInterval = exponential(0.02s);

# Priority queue settings

**.router.ppp[*].queue.packetCapacity = 50

**.router.ppp[*].queue.classifierClass = “inet.queueing.classifier.LabelClassifier”

**.router.ppp[*].queue.priorityScheduling = true

**.router.ppp[*].queue.defaultGateIndex = 0

# Assign traffic classes based on priority

**.router.ppp[*].queue.classifier.classes = “udp1 udp2”

**.router.ppp[*].queue.classifier.defaultGateIndex = 0

4. Explanation of the Example

• Network Topology (PacketSchedulingNetwork.ned):
  • The network contains a router and two hosts such as hostA and hostB connected through Ethernet links.
  • The router is armed with an importance queue that will prioritize traffic based on predefined rules.
• Priority Queue Configuration:
  • The PriorityQueue module in the router is designed to prioritize packets based on traffic classes.
  • Traffic from hostA and hostB is categorised into numerous classes, with one class given higher priority than the other.
• Simulation Configuration (omnetpp.ini):
  • The .ini file configures the router’s queue to prioritize packets based on their classification. Packets from hostA and hostB can be allocated to various priority classes, disturbing the order in which they are transferred.

Running the Simulation

• Compile the project in OMNeT++ IDE and run the simulation.
• Monitor how packets are queued and transferred based on their priority by using OMNeT++’s tools. Examine metrics like delay and throughput for several traffic classes.

Extending the Example

• Implement Custom Scheduling Algorithms: Expand or make new scheduling algorithms such as Weighted Round Robin, Deficit Round Robin by changing or executing new queue modules.
• Simulate Different Traffic Types: Launch many kinds of traffic like video, voice, best-effort data and learn how the scheduling algorithm manages them.
• QoS Management: Incorporate QoS management features such as admission control, policing, and traffic shaping to understand how they communicate with packet scheduling.
• Multiple Routers and Paths: Develop the network to comprise various routers and paths, permitting to learn how scheduling impacts routing decisions and complete network performance.

Given above informations, and approaches are completely supports to implement the Network Packet Scheduling in OMNeT++. We will offer further details regarding this topic in various simulation scenarios.

Contact omnet-manual.com for implementation support for the Network Packet Scheduling in the OMNeT++ utility. Obtain assistance with network performance analysis and our project topic ideas.