Date Added: Nov 2009
Wireless LANs are becoming more sophisticated and innovative due to low cost, genuine mobility, fast implementation, customer satisfaction and high data rate communication. IEEE 802.11 is a wireless LAN standard originally designed for wireless communication. It defines the physical and MAC layer specifications for wireless LAN, where it supports two modes of operation. Distributed Coordination Function (DCF) doesn't have central node and all nodes compete for the channel using CSMA/CA protocol. Point Coordination Function (PCF) has a central node, which controls the network by broadcasting beacon frames periodically. DCF and PCF modes can coexist in one cell by defining interframe spacing. Moreover, it has one MAC, which interacts with three PHYs.