Book excerpt: The leading introductory wireless book moves into the digital age with massive updates on 3G, Wi-Fi, wireless broadband, wireless IP, GPRS, and more. Anyone working in or interested in the wireless industry will find thorough coverage of the basics of wireless networks, technology, and regulations, with clear explanations of concepts like radio frequency, cell sites, and switching, and details of the regulations and standards that affect service providers and equipment manufacturers. NEW coverage includes: Wi-Fi and WiMAX Wireless Local Number Portability (LNP) Smart Antennas Wireless IP Personal Area Networks (PANs) 3G and UMTS