Abstract
This chapter describes voice over Wi-Fi in conjunction with other wireless technologies, including proposed 802.11 extensions, cellular, WiMax, Bluetooth (BT), and conventional cordless phone systems. One characteristic of the 802.11 standard is the ever-present enhancement process. The inclusion of a voice-over Wi-Fi capability into a cell-phone handset can be viewed as the ultimate goal for voice over Wi-Fi. WiMax is a new wireless technology, defined by IEEE 802.16x standards. The core standard, 802.16, defines protocols for a broadband wireless infrastructure, operating in the 10–66 GHz frequency range. BT is radio technology geared at the 2.4–2.5835 GHz ISM unlicensed frequency band just like Wi-Fi. Digital Enhanced Cordless Telecommunications (DECT) works in the 1.9 GHz band and utilizes a time-division multiplexing approach to bandwidth allocation. The 802.22 project is working on how to use portions of the RF spectrum, currently allocated to television broadcasting, for carrying wireless data services.
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