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Wireless LAN Simulation - IEEE 802.11 MAC Protocol

Wireless LAN Simulation - IEEE 802.11 MAC Protocol. Pavan Pant Thomas Castelli. Outline. Project Description IEEE 802.11 MAC Protocol Simulation Performance Analysis. Project Goals. MATLAB simulation - DCF (Distributed Coordination Function) - No Propagation Delay

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Wireless LAN Simulation - IEEE 802.11 MAC Protocol

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  1. Wireless LAN Simulation- IEEE 802.11 MAC Protocol Pavan Pant Thomas Castelli

  2. Outline • Project Description • IEEE 802.11 MAC Protocol • Simulation • Performance Analysis Simulation of a Wireless LAN

  3. Project Goals • MATLAB simulation - DCF (Distributed Coordination Function) - No Propagation Delay • Performance Analysis - Number of Nodes - Range - Packet Size - RTS/CTS Simulation of a Wireless LAN

  4. DCF • DCF - CSMA/CA is a DCF • Salient features - Medium sharing through CSMA/CA - Allows one STA to use the medium - Random Back off interval before retransmission - Refinement – RTS/CTS packets Simulation of a Wireless LAN

  5. IEEE 802.11 MAC Protocol • Also known as CSMA/CA • 802.11 CSMA (no collision detection) Sender If the channel is idle for DIFS seconds - Transmit DATA packet If the channel is busy - Backoff Receiver If DATA packet received - Return ACK after SIFS seconds Source Destination DIFS DATA SIFS ACK Simulation of a Wireless LAN

  6. IEEE 802.11 MAC Protocol CSMA/CA(Collision Avoidance) - RTS/CTS Implementation • Sender transmits an RTS packet • Receiver responds with a CTS packet • Purpose of CTS packet • - Reserves channel for sender • - Notify other stations Source Destination DIFS RTS SIFS CTS SIFS DATA SIFS ACK Goal – Avoid “Hidden Node” collisions Simulation of a Wireless LAN

  7. MATLAB Simulation • Old Simulation - Implemented CSMA (No RTS/CTS) • New Simulation - Includes RTS/CTS exchange - Simulates CSMA/CA Simulation of a Wireless LAN

  8. Analysis Simulation of a Wireless LAN

  9. Strengths/Weaknesses • Strengths • - Fairly accurate simulation of CSMA/CA • - Fewer packet collisions and more successful • transmissions evident • Drawbacks of our simulation • - Cluttered simulation window • - Deadlocks increase with more nodes Simulation of a Wireless LAN

  10. Any Questions? Simulation of a Wireless LAN

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