Siemens IEEE802.11 Manuale Utente Pagina 63

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WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 63 © Siemens, 2002
Summary: MAC Functionality
n Independent and Infrastructure configuration support
Each BSS has a unique 48 bit address
Each ESS has a variable length address
n CSMA with collision avoidance
MAC-level acknowledgment
allows for RTS/CTS exchanges (hidden node protection)
MSDU fragmentation
“Point Coordination” option (AP polling)
n Association and Reassociation
station scans for APs, association handshakes
Roaming support within an ESS
n Power management support
stations may power themselves down
AP buffering, distributed approach for IBSS
n Authentication and privacy
Optional support of “Wired Equivalent Privacy” (WEP)
Authentication handshakes defined
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