IEEE 802.11 Wireless LAN (WLAN) Technology
This paper describes and evaluates wireless IEEE 802.11 WIRELESS LAN. This paper introduces some major topics like wireless networks, IEEE 802.11 wireless LAN, IEEE 802.11 Medium Access Control and the ALOHA system. Section II introduces the wireless networks explaining the wireless network consist radio signals, the data format and the network structure and different architectures that enhances wireless communications and fulfill important functions necessary for specific applications. It concluded that wireless networks provides some essential benefits like Flexibility, Increased Efficiency,Adjustability,Security and VOIP technology.It focuses on IEEE 802.11 medium access control( MAC) which in wireless networks controls and manages the access and packet transmission through the shared channel in a distributed manner, with minimum possible overhead involved.IEEE 802.11 medium access control (MAC) introduces the two sublayers of IEEE 802.11 which uses distributed coordination function (DCF) and point coordination function (PCF). Another important aspect is IEEE 802.11 supports mainly three basic topologies: Independent Basic Service Set (IBSS), Basic Service Set (BSS), and Extended Service Set (ESS).Finally, the paper provided a comprehensive discussion on ALOHA system reviewing the main aim of the ALOHA protocol is to determine that which competing station must get the next chance of accessing the multi-access channel at MAC layer.
Index Terms - Wireless Networks, IEEE 802.11 Wireless LAN, IEEE 802.11 medium access control, ALOHA.