How to Implement Ultra Reliable Low Latency in ns2

To implement Ultra Reliable Low Latency Communication (URLLC) in NS2 has needs to emulate a network in which communication must be highly reliable and occur with minimal delay. URLLC is acute for applications like autonomous vehicles, industrial automation, remote surgery, and other time-sensitive operations. Attaining URLLC require a careful management of network resources, prioritization of critical data, and delaying the packet loss and delays.

The given below is the brief procedure to implement a basic URLLC scenario in NS2:

Step-by-Step Implementation:

  1. Understand URLLC Network Components:
  • Devices/Nodes: Devices or nodes that need ultra-reliable and low-latency communication like sensors, controllers, or actuators in a critical system.
  • Central Controller: A centralized node that handles interaction and makes sure reliability and low latency.
  • Communication Links: Links among the nodes that must support high reliability and low latency.
  1. Set Up the NS2 Environment:
  • Make sure NS2 is installed on system.
  • Acquaint yourself with writing TCL scripts, as NS2 simulations are controlled through TCL.
  1. Define the Network Topology:
  • Generate nodes that signify the devices in the URLLC network. These nodes will communicate to emulate an ultra-reliable and low-latency communication.

# Define the simulator

set ns [new Simulator]

# Create a trace file for analysis

set tracefile [open out.tr w]

$ns trace-all $tracefile

# Create a NAM file for animation

set namfile [open out.nam w]

$ns namtrace-all-wireless $namfile 10

# Set up the network parameters

set opt(chan)   Channel/WirelessChannel ;# Channel type

set opt(prop)   Propagation/TwoRayGround;# Radio-propagation model

set opt(netif)  Phy/WirelessPhy ;# Network interface type

set opt(mac)    Mac/802_11 ;# MAC type

set opt(ifq)    Queue/DropTail/PriQueue ;# Interface queue type

set opt(ll)     LL;# Link layer type

set opt(ant)    Antenna/OmniAntenna;# Antenna model

set opt(ifqlen) 50 ;# Max packet in ifq

set opt(x)      1000;# X dimension of the topography

set opt(y)      1000;# Y dimension of the topography

set opt(adhocRouting) AODV ;# Ad hoc routing protocol (you can modify this as needed)

# Create a topography object

create-god 10

# Configure the nodes (e.g., URLLC devices)

$ns node-config -adhocRouting $opt(adhocRouting) \

-llType $opt(ll) \

-macType $opt(mac) \

-ifqType $opt(ifq) \

-ifqLen $opt(ifqlen) \

-antType $opt(ant) \

-propType $opt(prop) \

-phyType $opt(netif) \

-channelType $opt(chan) \

-topoInstance $topo \

-agentTrace ON \

-routerTrace ON \

-macTrace OFF \

-movementTrace ON

# Create URLLC nodes

set node1 [$ns node]  ;# URLLC Node 1

set node2 [$ns node]  ;# URLLC Node 2

set controller [$ns node]  ;# Central Controller

# Set initial positions for the nodes

$node1 set X_ 100.0

$node1 set Y_ 500.0

$node1 set Z_ 0.0

$node2 set X_ 400.0

$node2 set Y_ 500.0

$node2 set Z_ 0.0

$controller set X_ 700.0

$controller set Y_ 500.0

$controller set Z_ 0.0

  1. Simulate Low Latency Communication:
  • Configure communication links that selects low latency. This can be completed by modifying the bandwidth, queuing mechanisms, and priority settings.

# Create duplex links between URLLC nodes with high bandwidth and low delay

$ns duplex-link $node1 $node2 100Mb 1ms DropTail

$ns duplex-link $node2 $controller 100Mb 1ms DropTail

  1. Implement Reliable Communication Mechanisms:
  • Execute mechanisms like acknowledgment-based communication like TCP or redundant paths to make sure consistency.

# URLLC Node 1 sends data to URLLC Node 2

set tcp_node1 [new Agent/TCP]

$ns attach-agent $node1 $tcp_node1

set tcp_node2_sink [new Agent/TCPSink]

$ns attach-agent $node2 $tcp_node2_sink

$ns connect $tcp_node1 $tcp_node2_sink

# Start sending data from Node 1 to Node 2

set app_node1 [new Application/FTP]

$app_node1 attach-agent $tcp_node1

$ns at 1.0 “$app_node1 start”

# URLLC Node 2 sends data to the Central Controller

set tcp_node2 [new Agent/TCP]

$ns attach-agent $node2 $tcp_node2

set tcp_controller_sink [new Agent/TCPSink]

$ns attach-agent $controller $tcp_controller_sink

$ns connect $tcp_node2 $tcp_controller_sink

# Start sending data from Node 2 to Central Controller

set app_node2 [new Application/FTP]

$app_node2 attach-agent $tcp_node2

$ns at 2.0 “$app_node2 start”

  1. Prioritize Critical Data:
  • Execute priority mechanisms to make sure that critical data is conducted with higher priority.

# Create a priority queue for critical data

set critical_ifq [new Queue/DropTail/PriQueue]

$critical_ifq setPriQueueSize 1 ;# Highest priority

$node1 set ifq_ $critical_ifq

$node2 set ifq_ $critical_ifq

$controller set ifq_ $critical_ifq

# Attach the priority queue to the nodes

$ns attach-pri-queue $node1 $tcp_node1 0

$ns attach-pri-queue $node2 $tcp_node2 0

  1. Simulate Data Transmission and Acknowledgment:
  • Make sure data is transmitted and acknowledged within tight latency constraints to emulate URLLC.

# Example of data transmission with acknowledgment

proc send_data_with_ack {src dst} {

global ns

puts “Sending data from $src to $dst with acknowledgment”

set tcp_src [new Agent/TCP]

$ns attach-agent $src $tcp_src

set tcp_dst_sink [new Agent/TCPSink]

$ns attach-agent $dst $tcp_dst_sink

$ns connect $tcp_src $tcp_dst_sink

set app [new Application/FTP]

$app attach-agent $tcp_src

$ns at 1.0 “$app start”

}

# Schedule data transmission with acknowledgment

$ns at 1.5 “send_data_with_ack $node1 $node2”

$ns at 2.5 “send_data_with_ack $node2 $controller”

  1. Run the Simulation:
  • Describe when the simulation should end and run it. The finish procedure will close the trace files and open NAM for visualization.

# Define the finish procedure

proc finish {} {

global ns tracefile namfile

$ns flush-trace

close $tracefile

close $namfile

exec nam out.nam &

exit 0

}

# Schedule the finish procedure at 10 seconds

$ns at 10.0 “finish”

# Run the simulation

$ns run

  1. Analyze the Results:
  • Use the trace file (out.tr) to evaluate the data transmission, latency, and reliability. Concentrate on the parameters end-to-end delay, packet loss, and acknowledgment success.
  • Open the NAM file (out.nam) to visualize the network operations and track the communication among the nodes.
  1. Customize and Extend:
  • We can modify the simulation by:
    • Maximizing the number of nodes to emulate a larger URLLC network.
    • Executing advanced URLLC scenarios, like real-time control systems, autonomous vehicle communication, or industrial automation.
    • To mimic the numerous scenarios, like network congestion, node failures, or changing data loads, to validate the robustness of URLLC.

Example Summary:

This sample configures a simple Ultra Reliable Low Latency Communication (URLLC) network simulation in NS2 that concentrates on high reliability and low latency communication among the nodes. The simulation will show how critical data can be routed with minimal delay and high reliability.

Advanced Considerations:

  • For more complex scenarios, deliberate the incorporating NS2 with specialized tools or developing custom modules to emulate advanced URLLC technologies, like network slicing, dynamic resource allocation, or machine learning-based optimization.
  • Expand the simulation to contain advanced characteristics like Quality of Service (QoS) management, security like encryption, authentication, or fault tolerance in URLLC networks.

Debugging and Optimization:

  • Use the trace-all command to debug the simulation and evaluate packet flows.
  • Enhance the simulation by refining communication protocols, modifying the priority settings, and tuning network parameters for better performance and effectiveness.

In this setup, we clearly understood the basic implementation procedures for highly reliable communication over the URLLC network nodes that were securely implemented using the ns2 tool we also outline additional information about how the Ultra Reliable Low Latency Communication performs in diverse simulation tool. our developers implement Ultra Reliable Low Latency Communication in your ns2 application. Please share the details of your research with us, and we will provide you with superior performance analysis help. We focus on network resource management, crucial data priority, and packet loss and delay mitigation for your projects.