April 2011
Intermediate to advanced
368 pages
11h 36m
English
Content preview from Secure Roaming in 802.11 Networks
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Chapter 3
unacceptable. There are different metrics that can be used to make this determination. These
include the following:
– Observing an increase in retry counts due to transmission errors
– A downward shift of the transmission rate due to the inability to communicate at
higher speeds
– Too many missed beacons
– Too many frames received with errors
– A direct measurement of decreasing Radio Signal Strength, as measured by the RSSI
parameter
Different implementations may require one or more of these metrics to trigger a roam.
Because all these are directly or indirectly a function of signal strength, we will refer to
them generically as signal-strength-based ...
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