Google's Project Loon, now testing use of unmanned balloons to provide Internet access, has important trials underway with Telstra in Australia, Telefonica in Latin America and with Vodafone in New Zealand.
It is believed the tests involve relaying Long Term Evolution signals from mobile cell towers up to the balloons, and then back to earth.
Presumably the terminals are smartphones, modified for the test frequencies, able to receive LTE signals directly from the balloons.
That suggests a plausible backhaul network will be based on mobile LTE towers and networks. Whether that will prove the only backhaul method, over time, remains to be seen.
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