nThe
number of collisions that can be seen by a node over a certain period can indicate the node mobility
or medium usage
condition more precisely than other parameters
ØThe faster nodes move, the larger number of
collisions can be observed
by nodes
ØThe larger number of collision happens, the more backoff
periods are and less
medium usage is detected
nMethod
ØNodes measure the medium usage and number of
collisions over a certain
period
ØBased on the number of collisions, a suitable threshold
is set