20.1 Motivation for Wireless Network Usage

	As discussed in the introduction, traditional wired networks allow communication through guided medium (wires).
	It assumes that communicating parties' locations are fixed while involved in the communication.
	It assumes that communicating parties' locations are fixed while involved in the communication.
	Traditional communication network infrastructures do not support terminal movement (only support fixed connections to terminals.
	To modify fixed traditional network infrastructure, a new wireless infrastructure is required.
	This wireless infrastructure can act as an interface between the fixed backbone network infrastructure and the mobile terminals.
	The wireless infrastructure network topology contains witches, routers and point-to-point links.
	In addition to that, these networks include Base Stations (BSs) or Access Points (APs).
	An AP is a transceiver to communicate with wireless terminals and act as point of access to the fixed wireless network infrastructure.
	A wireless base stations has a limited coverage. If the required area to be covered is more than the base station coverage area, multiple base stations are required. The wireless network needs to maintain a continuous connection as the mobile terminal is moving through the coverage area of different base stations.