The basic service set (BSS) is the basic building block of an 802.11 wireless LAN. In infrastructure mode, a single access point (AP) together with all associated stations (STAs) is called a BSS; this is not to be confused with the coverage of an access point, which is called basic service area (BSA). An access point acts as a master to control the stations within that BSS; the simplest BSS consists of one access point and one station. In ad hoc mode, a set of synchronized stations (one of which acts as master) forms a BSS.
With 802.11, it is possible to create an ad-hoc network of client devices without a controlling access point; the result is called an independent basic service set (IBSS).
Read more about this topic: Service Set (802.11 Network)
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