A Basic Service Set(BSS) is a simple WLAN according to IEEE 802.11 in which two stations communicate directly with each other wirelessly. Such a Basic Service Set does not require any other active components such as Wireless Access Points( WAP); communication takes place via the WLAN adapters, Wireless Network Interface Controllers(WNIC).
The network modes supported by the Basic Service Set are also known as ad hocnetworks or peer-to-peer networks. Multiple wireless nodes communicating in ad hoc mode form an independent wireless node group, an Independent Basic Service Set( IBSS).
Configurations that operate with a wireless access point (WAP) are called infrastructure WLANs, and the corresponding operation is called infrastructure mode. In this mode, the wireless access point (WAP) acts as a radio hub and establishes connections to the wired network. The access point and the stations registered with it form the basic service set, a radio cell. The connected stations communicate with each other using the same Service Set Identification( SSID).