In 802.11ah, defines 2, 4, 8, and 16 MHz channels. Besides, 1 MHz channel is additionally defined for the purpose of extended coverage. Support to 1 MHz and 2 MHz channels is mandatory.
802.11ah has defined country-specific channel allocation, including for US, South Korea, China, Europe, Japan and Singapore. (Note: Global operating classes are used for operation anywhere in the world and are used in addition to the operating classes for a specific region.)
In order to achieve a higher bandwidth, 802.11ah maintains the same channel bonding method as in 802.11ac, that is, several adjacent narrower channels are bonded together to yield a winder channel.
Figure 1 Channel Allocation for USA region
802.11ah specification frame work group defines different maximum channel bandwidths depending on different regulations and available spectra in various involved countries.
Figure 2 Channel Allocation for various countries