Wireless LAN Simulation - IEEE MAC Protocol

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Presentation transcript:

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

Simulation of a Wireless LAN Outline Project Description IEEE 802.11 MAC Protocol Simulation Performance Analysis 4 Dec, 2002 Simulation of a Wireless LAN

Simulation of a Wireless LAN Project Goals MATLAB simulation - DCF (Distributed Coordination Function) - No Propagation Delay Performance Analysis - Number of Nodes - Range - Packet Size - RTS/CTS 4 Dec, 2002 Simulation of a Wireless LAN

Simulation of a Wireless LAN 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 4 Dec, 2002 Simulation of a Wireless LAN

Simulation of a Wireless LAN 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 4 Dec, 2002 Simulation of a Wireless LAN

IEEE 802.11 MAC Protocol Goal – Avoid “Hidden Node” collisions 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 4 Dec, 2002 Simulation of a Wireless LAN

Simulation of a Wireless LAN MATLAB Simulation Old Simulation - Implemented CSMA (No RTS/CTS) New Simulation - Includes RTS/CTS exchange - Simulates CSMA/CA 4 Dec, 2002 Simulation of a Wireless LAN

Simulation of a Wireless LAN Analysis 4 Dec, 2002 Simulation of a Wireless LAN

Strengths/Weaknesses - 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 4 Dec, 2002 Simulation of a Wireless LAN

Simulation of a Wireless LAN Any Questions? 4 Dec, 2002 Simulation of a Wireless LAN