Thomas Kunz
Systems and Computer Engineering
186
802.11 Roaming
nNo or bad connection? Then perform:
nScanning
–scan the
environment, i.e., listen into the medium for beacon signals or send probes into the medium and wait for an
answer
nReassociation Request
–station
sends a request to one or several AP(s)
nReassociation Response
–success: AP
has answered, station can now participate
–failure:
continue scanning
nAP accepts Reassociation Request
–signal the
new station to the distribution system
–the
distribution system updates its data base (i.e., location information)
–typically,
the distribution system now informs the old AP so it can release resources