) The standard refers to
this topology as an Independent Basic Service Set (IBSS) and provides for some measure
of coordination by electing one node from the group to act as the proxy for the missing
access point.
Guide to Wireless LAN Analysis
17
The fundamental unit of the Infrastructure topology is the Basic Service Set (BSS),
consisting of a single AP (connected to the wired network) and the STAs associated with it
(shown in Figure 2.3). The user configures the AP to operate on a single channel.
To cover a larger area, multiple access points are deployed. When multiple BSSs are
connected to the same wired network (Figure 2.2), the arrangement is called an Extended
Service Set (ESS). Each access point is assigned a different channel wherever possible to
minimize interference. If a channel must be reused, it is best to assign the reused channel to
the access points that are the least likely to interfere with one another.
Figure 2.2: Extended Service Set (ESS) supports roaming from one cell to another.
When users roam between BSSs, they will find and attempt to connect with the AP
with the clearest signal and the least amount of network traffic.
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