Wireless Network consists of following pieces:
* Wireless hosts - end systems that run applications.
* Wireless links - connect hosts to other hosts or base station through a wireless communication link. Sometimes also used within a network to connect routers, switches, and other network equipment.
* Base station - is a key part of the wireless network infrastructure. A base station has no obvious counterpart in a wired network.
* Network infrastructure - this is the larger network with which a wireless host may wish to communicate.
* Infrastructure mode - hosts associated with a base station are often referred to as operating in infrastructure mode, since all traditional network services (e.g., address assignment and routing) are provided by the network to which a host is connected via the base station.
* Ad-hoc network - in such networks wireless hosts have no infrastructure with which to connect. In the absence of such infrastructure, the hosts themselves must provide for services such as routing, address assignment, DNS-like name translation, and more.
We can classify wireless networks according to the two criteria:
* Whether a packet in the wireless network crosses exactly one wireless hop or multiple wireless hops.
* Whether there is infrastructure such as a base station in the network.
There's the difference between mobile device and wireless link.