This amendment specifies a physical layer (PHY) for IEEE STD 802.15.4, and any media access control (MAC) changes needed to support this PHY, for use in equipment intended to address industry needs and to meet United States (US) Positive Train Control regulatory requirements and similar regulatory requirements in other parts of the world. The PHY enables operation in licensed or license-free radio frequency bands below 6 GHz; meets performance requirements at speeds up to 600 km/h; supports radio ranges on the order of 70 km; allows operation in contiguous or non-contiguous channel bandwidths as narrow as 5 kHz and potentially as high as 20 to 30 MHz, consistent with any applicable regulations; supports data rates up to 1 Mbps with flexible and robust quality of service; provides modulation methods and spectral characteristics consistent with local regulatory requirements; and accommodates rapidly changing network membership.
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