The IEEE 802.16 Working Group on Broadband Wireless Access maintains and enhances IEEE Std 802.16, which specifies the WirelessMAN® air interface for wireless metropolitan area networks. The standard includes a medium access control layer (MAC) specification structured to support multiple physical layer (PHY) specifications, each suited to a particular operational environment. The most popular air interface, known as "WirelessMAN-OFDMA", is the basis of external system specifications, including WiMAX Forum Release 1 and the "OFDMA TDD WMAN" radio interface in ITU's IMT-2000 standard. The 802.16m amendment was developed for use in ITU's IMT-Advacned recommendation.
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