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Power Consumption: 5G Basestations Are Hungry, Hungry Hippos

5G basestations are pushing up power requirements by three times, as MIMO and more digital circuitry require more power.

Dan Jones

March 6, 2019

2 Min Read
Power Consumption: 5G Basestations Are Hungry, Hungry Hippos

The increased power consumption of next-generation basestations may be one of the dirty little secrets of 5G, which might not be a secret much longer as operators roll out initial networks.

The power consumption of a 5G basestation is three times that of its 4G LTE predecessor, according to Zhengmao Li, EVP at China Mobile, at a presentation at Mobile World Congress last week, as noted by my Heavy Reading Colleague, Gabriel Brown:

5G basestations bump up the power requirements over 4G LTE, in part because of the massive antenna arrays (MIMO) used for the next generation tech. Earl Lum, president of EJL Wireless Research, says that MIMO increases the "power amplifiers" and "analog-to-digital paths" required, as well as overall digital circuitry in the units. For instance, typical 4G basestations now use 4 transmitter and 4 receiver (4T4R) elements, while 5G is expected to use 64T64R MIMO arrays.

"Sprint stuff is 64T64R," Lum notes. (See Sprint's Initial 5G Cities Will Get 4G Massive MIMO First.)

Lum expects this to increase power requirements at cellsites, "Now you'll need 10 kilowatts of power," he says, so that operators would likely want to have 15 kilowatts of power at hand. 4G cellsites use around 6 kilowatts for power, assuming a three-sector, 12 radio set-up.

This might cause some carriers to downgrade their MIMO requirements. South Korean operators are using 32T32R arrays for 5G, Lum says.

"There are lots of trade-offs, 64T64R makes sense for," Heavy Reading's Gabriel Brown notes. "Say Sprint with a US cell grid and the need for dual LTE-NR support, whereas somewhere like Korea or Europe 32T32R is a sweet spot."

Lum expects China Mobile to look to deploy 16T16R arrays in more rural areas, which will reduce costs but also speed and capacity.

Overall, power consumption should come down on 5G infrastructure over time. "Materials technology is improving," Brown says, while noting that "power-saving techniques" and AI will all come into play too over time.

While EJL Wireless Research's Lum says operators could hold off "maybe three years" in expectation of better power consumption results for 5G.

— Dan Jones, Mobile Editor, Light Reading

About the Author(s)

Dan Jones

Mobile Editor

Dan is to hats what Will.I.Am is to ridiculous eyewear. Fedora, trilby, tam-o-shanter -- all have graced the Jones pate during his career as the go-to purveyor of mobile essentials.

But hey, Dan is so much more than 4G maps and state-of-the-art headgear. Before joining the Light Reading team in 2002 he was an award-winning cult hit on Broadway (with four 'Toni' awards, two 'Emma' gongs and a 'Brian' to his name) with his one-man show, "Dan Sings the Show Tunes."

His perfectly crafted blogs, falling under the "Jonestown" banner, have been compared to the works of Chekhov. But only by Dan.

He lives in Brooklyn with cats.

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