Wireless LAN Protocols This talk is based on the course: CPSC Networks and Distributed Processing Spring2006/

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Presentation transcript:

Wireless LAN Protocols This talk is based on the course: CPSC Networks and Distributed Processing Spring2006/ Chapter 4

Different Wireless protocols

Wireless LAN Protocols A wireless LAN. (a) A transmitting. (b) B transmitting.

Wireless LAN Protocols (2) The MACA protocol. (a) A sending an RTS to B. (b) B responding with a CTS to A.

Wireless LANs The Protocol Stack The Physical Layer The MAC Sublayer Protocol The Frame Structure Services

Different protocols

The Protocol Stack Part of the protocol stack.

The MAC Sublayer Protocol (a) The hidden station problem. (b) The exposed station problem.

Wi-Fi Components

Collision-Avoidance Collision-Avoidance Strategy ~= a)RTS/CTS b)Physical carrier sense c)Virtual carrier sense: network allocation vector (NAV) RTS Sender Receiver CTS Other Sensors DATA ACK NAV (based on RTS) NAV (based on CTS) Contend for medium access defer access

The MAC Sublayer Protocol (2) The use of virtual channel sensing using CSMA/CA.

The MAC Sublayer Protocol (3) A fragment burst.

The MAC Sublayer Protocol (4) Interframe spacing in

Example: IEEE DCF a)Timing relationship

The Frame Structure The data frame.

Services Association Disassociation Reassociation Distribution Integration Distribution Services

Services Authentication Deauthentication Privacy Data Delivery Intracell Services

Broadband Wireless Comparison of and The Protocol Stack The Physical Layer The MAC Sublayer Protocol The Frame Structure

The Protocol Stack The Protocol Stack.

The Physical Layer The transmission environment.

The Physical Layer (2) Frames and time slots for time division duplexing.

The MAC Sublayer Protocol Service Classes Constant bit rate service Real-time variable bit rate service Non-real-time variable bit rate service Best efforts service

The Frame Structure (a) A generic frame. (b) A bandwidth request frame.

Bluetooth Bluetooth Architecture Bluetooth Applications The Bluetooth Protocol Stack The Bluetooth Radio Layer The Bluetooth Baseband Layer The Bluetooth L2CAP Layer The Bluetooth Frame Structure

Bluetooth Architecture Two piconets can be connected to form a scatternet.

Bluetooth Applications The Bluetooth profiles.

The Bluetooth Protocol Stack The version of the Bluetooth protocol architecture.

The Bluetooth Frame Structure A typical Bluetooth data frame.

Coverage vs. Data Rtae

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