Three-carrier aggregation, TDD and 256QAM – a mounting number of trials points to a dream team for 4G
As operators push for ever-greater 4G speeds, carrier aggregation is becoming more essential, and more complicated. Combining three, four or even five bands will push LTE to new limits, and the trials are piling up. The latest results come from SK Telecom in Korea and Nokia Networks, which showed peak download speeds of 428Mbps using triband TD-LTE carrier aggregation (CA), together with 256QAM modulation.
This demonstration is a vital proof point for the TD-LTE community, said the partners, which worked with Qualcomm Snapdragon on the device modem side. Unpaired TDD spectrum is often more plentiful and affordable than FDD bands, and may provide opportunities for new or disruptive entrants. The Chinese carriers, and some others such as Sprint and Softbank, will make heavy use of FDD/TDD combinations to drive up their capacity and improve their economics.