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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 l.jpg

Wireless LAN Simulation- IEEE 802.11 MAC Protocol

Pavan Pant Thomas Castelli


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Outline

  • Project Description

  • IEEE 802.11 MAC Protocol

  • Simulation

  • Performance Analysis

Simulation of a Wireless LAN


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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


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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


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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


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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


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MATLAB Simulation

  • Old Simulation

    - Implemented CSMA (No RTS/CTS)

  • New Simulation

    - Includes RTS/CTS exchange

    - Simulates CSMA/CA

Simulation of a Wireless LAN


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Analysis

Simulation of a Wireless LAN


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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


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Any Questions?

Simulation of a Wireless LAN


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