- Passive scanning:
- Passive scanning
is always enabled
and cannot
be disabled !!!
- In passive scanning, the mobile node will passively listen for AP transmissions
- Passive scanning
is always enabled
and cannot
be disabled !!!
- The passive scanning
procedure:
- Each AP
periodically broadcasts
a capacity report message
to enable
mobile nodes to
"find the best AP":
- A mobile node will continuously scans (monitor) for the capacity reports transmitted by APs
- Each AP
periodically broadcasts
a capacity report message
to enable
mobile nodes to
"find the best AP":
- Switching AP in
Passive Scanning:
- When a node
discovers a
better AP
(an AP with
a stronger signal,
it will transmit a
Association Request message
to that AP:
The old associated node will also receive the association request:
- This is an indication for the old associated AP to remove the mobile node (and free buffers)
- When a node
discovers a
better AP
(an AP with
a stronger signal,
it will transmit a
Association Request message
to that AP: