T-Mobile has used new radio carrier aggregation to boost 5G performance, combining mid-band downloads with low-band uploads.

T-Mobile was one of the first companies to popularize the multi-frequency approach, using low-band, mid-band and high-band mmWave to build a full 5G network. Each of these types of 5G has their own advantages.

Low-band is only marginally faster than 4G LTE, but offers excellent range and building penetration since it’s in the 600 MHz spectrum. Mid-band is widely believed to be the sweet spot, offering over 1 Gbps speed, combined with decent range. T-Mobile is using the 2.6 Ghz spectrum it acquired in the Sprint merge for its mid-band. mmWave, on the other hand, is the fastest type of 5G and is over 6 Ghz. Unfortunately, its range is only a couple hundred meters and it has abysmal penetration.

T-Mobile has been experimenting with combining mid-band spectrum for downloads, while using low-band for uploads. The end result has been increased speeds overall, while at the same expanding the carrier’s 5G footprint.

“When it comes to our network and what we deliver to customers, we never rest on our laurels,” saidx Abdul Saad, Chief Technology Officer at T-Mobile. “We have the first and largest nationwide 5G network, covering over 250 million people across 1.3 million square miles, and we’ll never stop working with industry leaders to develop and refine new technologies like this so we can deliver #5GforAll.”