Evolution and emerging issues

Evolution of mobile wireless network and the widespread deployment and increasing use of mobile services are discussed. Current users are served by many different standards including first-generation (1G) and second-generation (2G)networks based on one or more versions of wireless communication protocols, including frequency division multiple access (FDMA). To support roaming across heterogeneous wireless network and packet-switched wireless communications, there is a growing interest in design and development of 4G wireless networks. Developments in the domain of wireless communications include the rapid acceptance of the IEEE family of 802.11 standards, also called Wi-Fi (wireless fidelity). Wi-Fi was designed as an inexpensive alternative for the hardwired Ethernet because buildings so not need to be wired or rewired. The appearance of Worldwide Interoperability for Microwave Access (WiMAX) is being standardized by the ongoing work of IEEE's 802.16 Working Group WirelessMAN.