Siemens IEEE802.11 Tutorial page 54

Mobility inside a WLAN 'hotspot'
by link layer functions...
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Station decides that link
to its current AP is poor
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Station uses scanning
function to find another AP
or uses information from
previous scans
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Station sends Reassociation
Request to new AP
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If Reassociation Response is successful
then station has roamed to the new AP
else station scans for another AP
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If AP accepts Reassociation Request
normally old AP is notified through Distribution System
AP indicates Reassociation to the Distribution System
WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 54 © Siemens, 2002