T-Mobile announced that it has achieved record-breaking uplink speeds of 345 Mbps on its 5G standalone (SA) network in a recent test using a new 5G technology called Uplink Transmit Switching. The technology combines carrier aggregation (CA) and SU-MIMO (single user multiple input, multiple output). This test delivered uplink speeds 25% faster than T-Mobile's previous record of 275 Mbps using sub-6 (non-mmWave) frequencies. The test used Nokia network equipment and a smartphone powered by a flagship Qualcomm Snapdragon chip. Not all 5G devices support Uplink Transmit Switching. T-Mobile's President of Technology Ulf Ewaldsson said: "we implore our partners around the globe to build the capability into the 5G ecosystem moving forward."


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