Today, the 2.4- and 5-GHz wireless bands for the earlier 802.11 standards are heavily congested. They also lack the capacity to deliver the extreme data rates required for emerging business and consumer applications. The multi-gigabit data rates required for uncompressed high-definition multimedia transmissions—including known futures like 4k and 8k digital cinema (3840 x 2160 and 7680 x 4320 pixels respectively) and three-dimensional (3D) video streaming—must be accommodated in a different way.

Ultimately, data capacity is tied to modulation bandwidth. And extreme data capacity calls for a large spectrum allocation. The simplicity of high-volume manufacturing demands that this modulation bandwidth should be a small percentage of the transmission frequency. The global unlicensed band that already exists at around 60 GHz (where multi-gigahertz modulation bandwidths are practical) meets that requirement.

Because 60-GHz transmission suffers from large attenuation when propagating through physical barriers, this usage model is different from the other IEEE 802.11 standards. Low-power transmissions will not propagate very far. This is considered an advantage, as it reduces the likelihood of co-channel interference and increases the potential density for frequency re-use. Another perceived advantage of limited range is the reduced opportunity for "theft" of protected content by eavesdropping on nearby transmissions.

The unlicensed frequency allocations at around 60 GHz in each region do not match exactly. But there is substantial overlap. At least 3.5 GHz of contiguous spectrum is available in all regions that have allocated spectrum.

The ITU-R-recommended channelization comprises four channels that are each 2.16-GHz wide. They are centered on 58.32, 60.48, 62.64, and 64.80 GHz. As Figure 3 illustrates, not all channels are available in all countries. Channel 2, which is globally available, is therefore the default channel for equipment operating in this frequency band. In November 2011, this channelization and the corresponding spectrum mask for the occupying signal were approved by ITU-R WP 5A for global standardization.

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