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MANET Experiment - I (Using Network Simulator NetSim


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Develop MAC Protocol using NetSim Network Simulator for MANETs to send the packet without any contention through wireless link using the following MAC protocol(CSMA/CA (802.11)).
Analyze its performance with
1.Increasing node density

This experiment is part of Visvesvaraya Technological University (VTU) syllabus for post graduate students.

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MANET Experiment - I (Using Network Simulator NetSim

  1. 1. Lab Experiment – I (per VTU M-Tech Syllabus) On Mobile Ad-Hoc Network using
  2. 2. Objective: • Develop MAC Protocol using NetSim for MANETs to send the packet without any contention through wireless link using the following MAC protocols;(CSMA/CA (802.11)). Analyze its performance with • Increasing node density • Mobility
  3. 3. Introduction: • Mobile Ad-Hoc Network (MANET) is a self-configuring network of mobile nodes connected by wireless links to form an arbitrary topology without the use of existing infrastructure. The nodes are free to move randomly. Thus the network's wireless topology may be unpredictable and may change rapidly. • Mobility and node density are the two major factors which influences the performance of any routing protocol of mobile ad hoc network. The mobility of the nodes affects the number of connected paths, which in turn affect the performance of the routing algorithm. • The node density also has an impact on the routing performance. With very sparsely populated network the number of possible connection between any two nodes is very less and hence the performance is poor. It is expected that if the node density is increased the throughput of the network shall increase, but beyond a certain level if density is increased the performance degrades.
  4. 4. Performance metrics: • Throughput: It is the rate of successfully transmitted data packets in unit time in the network during the simulation. • Average Delay: It is defined as the average time taken by the data packets to propagate from source to destination across a MANET. This includes all possible delays caused by routing discovery latency, queuing at the interface queue, and retransmission delays at the MAC, propagation and transfer times. • Packet Delivery Ration (PDR): This is the ratio of the number of data packets successfully delivered to the destinations to those transmitted by sources. Packet Delivery Ratio = Total_Pkts_Rcvd/ Total_Pkts_Transmtd
  5. 5. Performingthe experimentusing NetSim
  6. 6. Results (IncreasingNodeDensity) 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 4 6 8 Throughput(Mbps) Number of Nodes Throughput
  7. 7. Average Delay 0 5 10 15 20 25 30 4 6 8 AverageDelay(Seconds) Number of Nodes Results (IncreasingNodeDensity)
  8. 8. Packet Delivery Ratio 0 0.2 0.4 0.6 0.8 1 1.2 4 6 8 PacketDeliveryRatio Number of Nodes Results (IncreasingNodeDensity)
  9. 9. Inference (IncreasingNodeDensity) • As the number of nodes increases (4  6  8) the throughput of the network increases because the channel is able to handle additional network traffic. However, if the number of nodes is increased further (6  8), the throughput decreases as the network traffic is too high, and this leads to collisions. • As the number of nodes increases, the delay also increases as it takes more time for a packet to reach its destination. The packet delivery ratio decreases with the increase in nodes, as collisions are higher leading to lower number of packets successfully reaching the destination.
  10. 10. Throughput Results (IncreasingMobility) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 60 70 80 Throughput(Mbps) Mobility Velocity (m/s)
  11. 11. Inference (IncreasingMobility) • As the mobility of nodes increases, the throughput decreases. This is because as the velocity increases, more packets get lost in lieu of ad hoc movement of the nodes. The packet delivery ratio decreases as the sum of total packets received decreases with increased mobility.
  12. 12. NetSim is a premium simulation software, developed since 2003, with an extensive and growing set of over 300 customers in over 15 countries. NetSim is used for protocol modeling and simulation, network R & D and defence applications. It allows users to analyze computer networks with unmatched depth, power and flexibility. About NetSim