IEEE 802.11

Introduction to IEEE 802.11 Wireless LAN Standard Huafeng Lü Sep 10, 2002

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object]

Why Wireless LAN ,[object Object],[object Object],[object Object]

Challenges and Constraints ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object]

Architecture: Components ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Architecture: Components (cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Architecture: Figure 1 ,[object Object],[object Object]

Architecture: Components (cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Architecture: Figure 2 ,[object Object]

MAC sublayer ,[object Object],[object Object]

MAC functions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MAC architecture ,[object Object],[object Object],[object Object],[object Object]

DCF ,[object Object],[object Object],[object Object]

DCF: Carrier-sense Mechanism ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DCF: Interframe Space (IFS) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DCF: Random Backoff Time ,[object Object],[object Object],[object Object],[object Object]

DCF: Random Backoff Time (cont.) Backoff time = rand() * slot_time ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DCF: Backoff Procedure ,[object Object],[object Object],[object Object],[object Object],[object Object]

DCF: MAC frame exchange RTS, CTS, data, ACK ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DCF: MAC frame exchange (cont.)

PCF ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

PCF in general ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

PCF: CFP/CP Alternation ,[object Object],[object Object],[object Object],[object Object]

How CFP begins ,[object Object],[object Object],[object Object]

During the CFP ,[object Object],[object Object],[object Object],[object Object],[object Object]

During the CFP (cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Preventing STAs accessing medium independently ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How to end a CFP ,[object Object],[object Object]

Physical Layer ,[object Object],[object Object]

Typical Products: CISCO Aironet Wireless Adaptor

References ,[object Object],[object Object],[object Object]

IEEE 802.11

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IEEE 802.11