How to Implement Power Optimized Data Transmission in NS2

To implement the Network Power Optimized Data Transmission in NS2, we need to concentrates on reducing power utilization during data transmission though maintaining efficient communication. It encompasses enhancing different layers (like MAC and PHY layers) to minimize the transmission power of nodes and balance energy consumption through the network. You can refer the procedure in the following below:

Step-by-Step Process for Implementation:

  1. Understand NS2 Architecture:
  • NS2 is built on C++ for core simulation processes and OTcl for simulation scripting. Get to know the interaction amongst these two elements will be vital for executing power optimization.
  • Understand the energy model, transmission protocols (like AODV, DSR, etc.), and the way power is managed in these protocols.
  1. Install NS2 and Test Basic Simulations:
  • Install NS2 and make sure it’s working by executing example scripts (includes AODV or TCP-based simulations).
  • Acquaint yourself with how energy is used during simulations by altering and examining the energy parameters in the basic energy model.
  1. Modify or Create a Custom Energy Model:
  • NS2 offers a simple energy model that states how power is utilized during transmission and reception. You can begin by adjusting this model for power optimization.
  • Locate the energy model file: energy_model.cc and energy_model.h in the NS2 source directory. Fine-tune the power utilization variables to enhance the energy usage.

In energy_model.cc:

void EnergyModel::consumeTxPower(double power)

{

if (energy_ > 0) {

energy_ -= (power * tx_time_); // Reduce power consumption

}

}

  • You may need to alter transmission power (tx_power_) and reception power (rx_power_) relying on the distance amongst nodes, the type of data, and network conditions.
  1. Modify MAC Layer for Power Optimization:
  • One of the key places to execute power optimization is at the MAC (Medium Access Control) layer. You can tune the MAC protocols (like 802.11) to adjust transmission power in terms of specific criteria like node distance, traffic type, or channel conditions.

Alter mac-802_11.cc:

  • In the transmission code, modify the transmission power dynamically based on the distance amongst the source and destination nodes:

if (distance < threshold) {

tx_power_ = lower_power;  // Use lower power for short distances

} else {

tx_power_ = max_power;  // Use maximum power for long distances

}

  • Integrate a power control algorithm to decrease transmission power while maintaining signal integrity (for instance: using power control algorithms like distance-based power control).
  1. Modify Routing Protocol for Power Optimization:
  • Power optimization can also be accomplished by fine-tuning routing protocols (such as AODV, DSR) to desire routes that reduce power usage.
  • Attach energy-aware routing decisions, favouring paths that decrease the overall power consumption of the network by modifying the routing protocols.

In aodv.cc (for AODV routing):

  • Include a field to the routing table to track energy consumption and choose routes based on power utilization:

double energyCost = calculateEnergyCost(route);

if (energyCost < minEnergyCost) {

bestRoute = route;

minEnergyCost = energyCost;

}

  1. Incorporate Power Control Algorithms:
  • Execute power control algorithms like Adaptive Transmission Power Control (ATPC), Distance-Based Power Control, or Minimum Energy Transmission. These algorithms adjust transmission power depends on the network topology and energy demands.

Example:

    • Nodes inside short distances use lower transmission power, while nodes farther away use higher power to uphold connectivity.
    • Compute the need power level dynamically based on the distance amidst interacting nodes.
  1. Modify OTcl Simulation Script:
  • Write an OTcl script to set up the simulation, set up nodes, and apply power optimization policies during transmission.

Sample OTcl script:

set ns [new Simulator]

set opt(chan)     Channel/WirelessChannel

set opt(prop)     Propagation/TwoRayGround

set opt(netif)    Phy/WirelessPhy

set opt(mac)      Mac/802_11

set opt(ifq)      Queue/DropTail/PriQueue

set opt(ll)       LL

set opt(ant)      Antenna/OmniAntenna

set opt(ifqlen)   50

set opt(energy)   EnergyModel

set opt(txPower)  0.5

set opt(rxPower)  0.1

set opt(idlePower) 0.005

# Define nodes with energy model and power parameters

for {set i 0} {$i < $opt(nn)} {incr i} {

set node_($i) [$ns node]

$node_($i) set energyModel_ $opt(energy)

$node_($i) energyModel setInitialEnergy 1000

}

# Power optimization during transmission

$ns at 1.0 “$node_(0) set_txPower 0.2” ;# Set lower tx power

$ns at 2.0 “$node_(0) set_txPower 0.5” ;# Increase tx power for long range

  1. Compile and Run the Simulation:
  • After making alterations to the C++ files (like energy_model.cc or mac-802_11.cc), recompile NS2 using the command:

make clean

make

  • Execute your OTcl simulation script:

ns your_script.tcl

  1. Analyze Simulation Results:
  • Once the simulation is done, assess the trace file to compute the power optimization performance.
  • Use metrics like total power utilization, network lifetime, packet delivery ratio (PDR), and throughput to estimate the effectiveness of the power-optimized transmission.

You can use tools like NAM (Network Animator) for visual simulation or analyze trace files for detailed performance evaluation.

Key Files to Modify:

  • Energy Model: energy_model.cc and energy_model.h
  • MAC Layer: mac-802_11.cc and mac-802_11.h
  • Routing Protocol: If modifying the routing layer, files like aodv.cc (or the routing protocol in use)
  • Simulation Script: OTcl scripts to state nodes, energy settings, and power optimization policies.

Power Optimization Strategies:

  • Distance-based power adjustment: Minimize transmission power for short-range communication.
  • Energy-aware routing: Choose paths with higher remaining energy to balance load.
  • Dynamic power control: Adjust power in terms of network topology or traffic conditions.
  • Sleep modes: Utilize energy-saving sleep modes for idle nodes.

The delivered manual contains the entire information including how the ns2 architecture works and how to customize the energy models and how to modify the MAC layer for the execution of Power Optimized Data Transmission within the Network using the ns2 tool.

Connect with us to access the most effective Network Power Optimized Data Transmission results in NS2 implementation. We offer all the resources necessary to provide you with the finest topics and prompt assistance.