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Siemens IEEE802.11 User Manual

Page 54

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

Page 54

© Siemens, 2002

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

n

If AP accepts Reassociation Request

normally old AP is notified through Distribution System

AP indicates Reassociation to the Distribution System