A look at IEEE 802.11ah: Wi-Fi below 1 GHz: Page 2 of 4

August 26, 2015 //By Kevin Qian and Mingyan Wang
Kevin Qian and Mingyan Wang examine the key issues of the IEEE 802.11ah standard

The second use case is in backhaul networks for sensors and meter data. The backhaul networks provide the connection between sensors and data collectors. IEEE 802.15.4g provides a link for the lower sensor and 802.11ah provides a wireless backhaul link to forward the aggregated data generated by the sensors to the data center. Figure 2 illustrates a wireless backhaul network in which the 802.11ah AP and gateway collect and forward the data from sensor devices to the data center.

Figure 2: 802.11ah can provides access to backhaul networks.

As an extended range Wi-Fi, 802.11ah can be used in homes, campuses, stadiums, shopping malls, and other locations. It provides a wider coverage range to reach garages, backyards, and basements than legacy WLAN technologies that operate at 2.4 GHz and 5 GHz. For example, a campus WLAN solution utilizes tri-band APs (2.4 GHz/5 GHz/ 900 MHz), so wireless access is provided everywhere on campus. Offices and classrooms are covered by 802.11ac and outdoor areas have 802.11ah APs to provide extended range coverage for space between buildings, parking lots, and sports fields. This helps cellular offloading with 802.11ah extended coverage. 802.11ah APs support wider coverage area and a larger number of students.

Channelization

Figure 3 shows the global channelization for 802.11ah. You can see that many countries have identified the spectrum for 802.11ah and have also specified the maximum bandwidth that they will support for 802.11ah. The maximum channel bandwidths obtained by the channel bonding are different due to the specific country regulations.

Figure 3: IEEE 802.11ah global channelization.

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