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WiMAX release 2.1, popularly branded as WiMAX 2+, is a backwards-compatible transition from previous WiMAX generations. It is compatible and interoperable with TD-LTE . Newer versions, still backward compatible, include WiMAX release 2.2 (2014) and WiMAX release 3 (2021, adds interoperation with 5G NR ).
IEEE 802.16 - called fixed WiMAX because of static connection without handover.; IEEE 802.16e - called mobile WiMAX because it allows handovers between base stations.; IEEE 802.16m - advanced air interface with data rates of 100 Mbit/s mobile and 1 Gbit/s fixed.
UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM. Time-division multiple access (TDMA) provides multiuser access by chopping up the channel into sequential time slices. Each user of the channel takes turns to transmit and receive signals. In reality, only one person is actually using the channel at a specific moment.
Sprint Corporation is working on migrating WiMAX customers to LTE compatible devices in order to begin transitioning the WiMAX bands to TDD LTE. In July 2013, Sprint announced its first tri-band products capable of accessing TDD-LTE data connections in the 2.5 GHz band still used for WiMAX. [134]
PureWave Networks was a developer of advanced, 4G LTE and WiMAX base stations. Based in Santa Clara, California, PureWave Networks is a privately held company that was founded in 2003. The company was backed by Silicon Valley venture firms including Allegis Capital, Benahmou Global Ventures, ATA Ventures, Core Capital and Leapfrog Ventures. [1]
WiMax offers a metropolitan area network with a signal radius of about 50 km (30 miles), far surpassing the 30-metre (100-foot) wireless range of a conventional Wi-Fi LAN. WiMAX signals also penetrate building walls much more effectively than Wi-Fi. WiMAX is most often used as a fixed wireless standard.
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2G, understood as GSM and CdmaOne, has been superseded by newer technologies such as 3G (UMTS / CDMA2000), 4G (LTE / WiMAX) and 5G . However, 2G networks were still available as of 2023 in most parts of the world, while notably excluding the majority of carriers in North America, East Asia, and Australasia. [5] [6] [7]