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Sprint to Be 1st in US With Massive MIMO?Sprint to Be 1st in US With Massive MIMO?

64x64 MIMO for 2.4GHz networks likely to arrive in 2017.

Dan Jones

February 7, 2017

2 Min Read
Sprint to Be 1st in US With Massive MIMO?

It is entirely possible that towards the end of this year -- or into 2018 -- Sprint will be able to claim the fastest 4G LTE network speeds in parts of the US with a completely straight face.

This is because Kansas City-based Sprint Corp. (NYSE: S) is likely to be the first operator to get its hands on so-called "Massive MIMO" smart antenna arrays, which will boost the speed and capacity of its 2.5GHz 4G network. Sprint already has 8x8 antenna arrays in its network, and expects to test 64x64 arrays at 2.5GHz this year. (See Sprint Lights Fire Under High-Band 4G, Builds for 5G.)

"The coming benchmark" is 64x64, Nokia Corp. (NYSE: NOK)'s North American CTO, Michael Murphy, told me recently. "Customers are asking for it."

And the first customer in the US is likely to be Sprint. Murphy says that 64x64 antenna arrays "will be coming very soon" for higher frequency TDD networks, such as Sprint's 2.5GHz LTE network, for example.

This is because the higher frequency the network, the simpler it is to build denser antenna arrays in a smaller space. Sprint's single-channel time division duplex (TDD) operates at a higher frequency than any of the other big three's cellular networks in the US.

By contrast, for 2-channel low and medium band networks in the US, Murphy is expecting 8X8 antenna arrays to arrive in 2017. 64X64 arrays are "not too far in the distance," Murphy says, but he does not give an actual date.

Sprint clearly already has some prototypes from Nokia kicking around. CTO John Saw brought one with him to New York City in December 2016 (see photo below).

Figure 1:

Sprint parent SoftBank Corp. has been testing such large arrays and started deploying 128-element MIMO systems in Toyko late last year. (See Massive MIMO Key to 5G, Says SoftBank.)

Along with other LTE-Advanced Pro (4.5G) features, such as bonding together radio channels to boost performance, upgraded MIMO should help Sprint head towards gigabit LTE and give it more know-how about a 5G future. (See Sprint Ups the 4G Speed Ante to 230 Mbit/s.)

Users, however, will -- as usual -- need to upgrade their devices to get the most out of MIMO upgrades on a network. (See New Qualcomm Chip Promises 'Gigabit' 4G.)

— 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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