
CSE5501: MOBILE & DISTRIBUTED COMPUTING SYSTEMS
Lecture 3: Wireless LANs
47
Access
Point
A
Access
Point
B
Steps to Re-association:
Adapter listens for beacons
from APs.
Adapter evaluates AP
beacons, selects best AP.
Adapter sends association
request to selected AP (B).
AP B confirms association
and registers adapter.
Roaming from Access Point A
to Access Point B
AP B informs AP A of
re-association with AP B.
AP A forwards buffered packets
to AP B and de-registers adapter.
WLAN’s Re-association Process –
Passive Scanning
WLAN’s
WLAN’s
Re
Re
-
-
association Process
association Process
–
–
Passive Scanning
Passive Scanning
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