How to Implement Network Channel Aggregation in NS2

To implement the network channel aggregation within NS2, we can replicate the concept of grouping several channels to maximise overall bandwidth and network performance. This aggregation is same to carrier aggregation that numerous channels are combined to enhance the throughput, reduce latency, or enhance overall network performance. Since, NS2 does not natively support channel aggregation, however we can replicate it by making several wireless channels and coordinating traffic over this channels. We deliver a step-by-step method on how to replicate the channel aggregation in NS2:

Step-by-Step Implementation:

  1. Basic Setup of the NS2 Environment:

Initially, configure the NS2 environment. In this situation, we will be described several channels, which will use to aggregate traffic. Every single of these channels signifies a distinct frequency band that will aggregate for data transmission.

# Create a simulator instance

set ns [new Simulator]

# Define channels for aggregation

set channel1 [new Channel/WirelessChannel]

set channel2 [new Channel/WirelessChannel]

set channel3 [new Channel/WirelessChannel]

# Setup propagation model, antenna, and other parameters

set prop [new Propagation/TwoRayGround]

set ant [new Antenna/OmniAntenna]

set mac [new Mac/802_11]

set ll [new LL]

set ifq [new Queue/DropTail/PriQueue]

  1. Define Nodes and Attach Them to Channels:

To execute the channel aggregation, we want to describe the numerous nodes and also allocate them to communicate across the several channels. The objective is to forward various portions of data traffic over several channels.

# Configure node parameters to attach to different channels

$ns node-config -adhocRouting AODV \

-llType $ll \

-macType $mac \

-ifqType $ifq \

-ifqLen 50 \

-antType $ant \

-propType $prop \

-phyType Phy/WirelessPhy \

-channelType $channel1

# Create the first node (source) and assign it to channel1

set node1 [$ns node]

# Configure second node to use another channel (channel 2)

$ns node-config -channelType $channel2

set node2 [$ns node]

# Configure third node to use another channel (channel 3)

$ns node-config -channelType $channel3

set node3 [$ns node]

  1. Simulate Data Traffic Over Aggregated Channels:

To replicate the channel aggregation, we shall require to divide the traffic over the numerous channels. For instance, using UDP with CBR (Constant Bit Rate) traffic, we can make a traffic flows over various channels and afterwards aggregate them at the receiver.

# Create UDP traffic sources over channel 1

set udp1 [new Agent/UDP]

$ns attach-agent $node1 $udp1

set cbr1 [new Application/Traffic/CBR]

$cbr1 set packetSize_ 1000

$cbr1 set interval_ 0.005   ;# Adjust the interval for data rate

$cbr1 attach-agent $udp1

# Create UDP traffic sources over channel 2

set udp2 [new Agent/UDP]

$ns attach-agent $node2 $udp2

set cbr2 [new Application/Traffic/CBR]

$cbr2 set packetSize_ 1000

$cbr2 set interval_ 0.005

$cbr2 attach-agent $udp2

# Create UDP traffic sources over channel 3

set udp3 [new Agent/UDP]

$ns attach-agent $node3 $udp3

set cbr3 [new Application/Traffic/CBR]

$cbr3 set packetSize_ 1000

$cbr3 set interval_ 0.005

$cbr3 attach-agent $udp3

  1. Create Sink Nodes for Aggregation:

In a channel aggregation situation that receiver node aggregates traffic from several channels. We require to make a sink nodes, which will obtain the traffic from each channel.

# Create sinks (null agents) to receive the data

set null1 [new Agent/Null]

$ns attach-agent $node1 $null1

set null2 [new Agent/Null]

$ns attach-agent $node2 $null2

set null3 [new Agent/Null]

$ns attach-agent $node3 $null3

# Connect the traffic sources to sinks

$ns connect $udp1 $null1

$ns connect $udp2 $null2

$ns connect $udp3 $null3

  1. Simulate Aggregation and Bandwidth Management:

The next stage is to aggregate the traffic and mimic the impact of having numerous channels are combined into one aggregated network. We can calculate and estimate the overall throughput and delay over numerous channels. The aggregated bandwidth is the amount of the separate channel throughputs.

  1. Monitor Performance Metrics (Throughput, Delay, Packet Loss):

To analyze the performance of channel aggregation, you need to enable trace files to log throughput, delay, and packet loss. This will help you see how the channel aggregation impacts the overall performance of the network.

# Set up trace files for analysis

set tracefile [open “tracefile.tr” w]

$ns trace-all $tracefile

# Define a stop time for the simulation

$ns at 10.0 “finish”

# Finish procedure to clean up after simulation ends

proc finish {} {

global ns tracefile

$ns flush-trace

close $tracefile

exit 0

}

# Run the simulation

$ns run

  1. Post-Simulation Analysis:

We can assess the trace files generated by NS2, after running the simulation. The performance of channel aggregation can calculate by observing at the combined throughput, packet delivery ratio (PDR), delay, and other network performance metrics.

These tools such as XGraph or gnuplot can support to envision the throughput and delay trends over time.

  1. Adjust Parameters for Different Scenarios:

Based on the scenario, we can modify the parameters of the simulation to observe how channel aggregation performs under various network conditions, in terms of:

  • Changing the bandwidth of each channel.
  • Launching an interference among the channels.
  • Differing the mobility of nodes.
  • Modifying the traffic load to replicate the real-world usage scenarios.

Example TCL Script for Channel Aggregation:

# Create a simulator instance

set ns [new Simulator]

# Create trace files

set tracefile [open “tracefile.tr” w]

$ns trace-all $tracefile

# Define two separate wireless channels (representing two channels to aggregate)

set channel1 [new Channel/WirelessChannel]

set channel2 [new Channel/WirelessChannel]

# Setup wireless network parameters

set prop [new Propagation/TwoRayGround]

set mac [new Mac/802_11]

set ll [new LL]

set ifq [new Queue/DropTail/PriQueue]

set ant [new Antenna/OmniAntenna]

# Configure node settings for channel aggregation

$ns node-config -adhocRouting AODV \

-llType $ll \

-macType $mac \

-ifqType $ifq \

-ifqLen 50 \

-antType $ant \

-propType $prop \

-phyType Phy/WirelessPhy \

-channelType $channel1

# Create node1 for traffic over channel 1

set node1 [$ns node]

# Configure second node on another channel (channel2)

$ns node-config -channelType $channel2

set node2 [$ns node]

# Create traffic source and sink for node1

set udp1 [new Agent/UDP]

$ns attach-agent $node1 $udp1

set cbr1 [new Application/Traffic/CBR]

$cbr1 set packetSize_ 1000

$cbr1 set interval_ 0.005

$cbr1 attach-agent $udp1

set null1 [new Agent/Null]

$ns attach-agent $node2 $null1

$ns connect $udp1 $null1

# Start traffic at 1.0 second

$ns at 1.0 “$cbr1 start”

# Stop simulation at 10.0 seconds

$ns at 10.0 “finish”

# Finish procedure

proc finish {} {

global ns tracefile

$ns flush-trace

close $tracefile

exit 0

}

# Run simulation

$ns run

As demonstrated, we showed the vital approach to implement and simulate the Network Channel Aggregation and also we provide required examples in NS2. Extra specific details concerning this subject will also be shared.

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