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Summary: mac functionality – Siemens IEEE802.11 User Manual

Page 63

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WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt

Page 63

© Siemens, 2002

Summary: MAC Functionality

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Independent and Infrastructure configuration support

– Each BSS has a unique 48 bit address
– Each ESS has a variable length address

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CSMA with collision avoidance

– MAC-level acknowledgment
– allows for RTS/CTS exchanges (hidden node protection)
– MSDU fragmentation
– “Point Coordination” option (AP polling)

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Association and Reassociation

– station scans for APs, association handshakes
– Roaming support within an ESS

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Power management support

– stations may power themselves down
– AP buffering, distributed approach for IBSS

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Authentication and privacy

– Optional support of “Wired Equivalent Privacy” (WEP)
– Authentication handshakes defined