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09 May 2017

These Toaster-Oven-Size Radios Will Help Bring 5G to Life

Cell towers like these let AT&T engineers
simulate how 5G will behave in the real
world.  Commercial deployment is expected
to begin in 2020, after companies around the
world hammer out technical standards.
These Toaster-Oven-Size Radios Will Help Bring 5G to Life
by Elizabeth Woykewww.technologyreview.com
10 March 2017

Within a few years, 5G networks could turbocharge your smartphone. But can they pass the tests cooked up by engineers at an office park in New Jersey?

Live-streaming a virtual-reality broadcast. Downloading a 90-minute high-definition TV show to your smartphone in less than three seconds. Sending instant updates on road conditions to self-driving vehicles. These scenarios are impossible or prohibitively expensive on current cellular networks, but they should be feasible with the next generation of wireless connectivity, 5G. It promises to be 10 to 20 times faster than today’s cell-phone networks.

That’s because 5G will operate in a high-frequency portion of the radio spectrum, known as millimeter wave. It has a lot of available bandwidth and should make it possible for wireless devices to process data with minimal delays. But since its wavelengths are much shorter, it is more easily obstructed. And because it has never been used for consumer mobile services, carriers are still learning how 5G signals will behave in different types of terrain and weather. “We need to look at how the signals are affected by things like snow, rain, sleet, hail, maple trees, oak trees, and spruce trees, because each of those will be different,” says AT&T research engineer Bob Bennett.

The problem: most 5G measurement equipment is so expensive, fragile, and bulky that it can be deployed outdoors for only a few hours at a time. ­Bennett and colleagues say that far more real-world data is needed to properly develop the technology, so they have created weatherproof radios the size of toaster ovens and installed them across AT&T’s 260-acre campus in Middletown, New Jersey, which was once part of Bell Labs.

Since deploying the radios last September, the engineers have seen how tree leaves, heavy rain, and truck traffic all obstruct millimeter-­wave signals to some extent. AT&T plans to share the information with the rest of the telecom industry to aid in the design of 5G technical specifications, base stations, modems, smartphone chips, and more. The new technology won’t be commercially widespread until after 2020, but these small, homemade radios are a crucial step toward making it real.

Photographs by Lauren Lancaster

Elizabeth Woyke,  Business Editor
I work with Nanette Byrnes to oversee, write, and edit MIT Technology Review’s business coverage. Business is a wide-ranging beat here, but I am especially interested in wireless communications, the Internet of things, innovative startups and… More


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