| 单词 | 802.16 |
| 释义 | 802.16 The IEEE specification entitled Air Interface for Fixed Broadband Wireless Access (BWA) Sys- tems.The 802.16 Working Group was formed to develop a set of specifications to standardize Local Multipoint Distribution Service (LMDS) and Multichannel Multipoint Distribution Services (MMDS), once promising BWA technologies that proved too costly and unreliable.The 802.16 specifications evolved over a number of years, as follows: • 802.16 (2001) standardized LMDS, focusing on fixed wireless solutions in both point-to-point and point-to-multipoint configurations, operating at frequencies in the 10–66 GHz range, and requiring line of sight (LOS). • 802.16a (2003) was based on MMDS and the European HiperMAN system.This extension includes both point-to-point and point-to-multipoint configurations, operates in the 2–11 GHz range, and does not require LOS in the lower bands. • 802.16d, aka 802.16-2004 (2004), is a compilation and modification of previous versions and amend-ments. 802.16d specifies frequencies in the 2–11GHz range, and includes point-to-point, point-to-multipoint, and mesh topologies.This specification recommends, but does not require, LOS, and includes support for indoor CPE. • 802.16e (October 2005), formally known as Mobile WirelessMAN, adds hand-off capability, thereby supporting portability and pedestrian-speed mobility for users of laptop, tablet, and handheld computers. Operating in the 2–6 GHz range, it is designed for point-to-multipoint applications and does not require LOS. See WiMAX for more technical detail. See also BWA, CPE, hand-off, HiperMAN, LMDS, LOS, mesh, MMDS, point-to-point, point-to-multipoint, portability, and WLL. |
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