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Wireless Networking Using 802.11b
Roaming
More than one WAP can be used to increase the wireless coverage in a
wireless LAN. The diagram below shows two WAPs configured to extend
coverage beyond that of a single WAP. The overlapping area of each BSS is
called an Extended Service Set (ESS). When a wireless computer enters the
ESS, the signal strength and link quality is evaluated by the computer and
the computer chooses the WAP with the best quality signal and link. This
activity is known as roaming. To configure WAPs to allow roaming inside of
the wireless network, each WAP will be assigned the same Service Set
Identifier (SSID). Strategically placing multiple WAPs around an office or
inside of the home can extend the wireless coverage to the entire premise.
The illustration below shows two Basic Service Sets overlapping to form an
Extended Service Set.
ESS
BSS2
BSS1
Desktop PC
Desktop PC Switch
Wireless
Access Point
Wireless
Access Point