- Notable fact:
- A mobile node can leave the coverage area of its associated AP without the AP knowing !!!
- Example:
- The node is currently
associated with
A:
- The node can
move out of
range:
without transmitting a association frame !!!
- The node is currently
associated with
A:
- Question:
- How can the old associated AP remove a mobile node that has silently moved out of range ???
- Solution of the
"out of range" mobile node:
- An associations with
mobile node has an
expiration time
- When the Access Point receives
a frame from the
mobile node:
- The Access Point will refresh the expiration time
- When the
expiration time has
expired
(i.e.,
the Access Point has
not heard from
that node
for longer than the
expiration time):
- The AP will remove the node's association !!!
- An associations with
mobile node has an
expiration time