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FAST solution, based on traditional carrier aggregation framework, deepens harmonization of multi-spectrum 5G bands by innovatively introducing uplink TDM scheduling to maximize the resources utilization efficiency and boost the system performance. By deeply aggregating the frequency-and-slot resources of FDD and TDD NR carriers or multi-TDD NR carriers with different frame structures, FAST solution not only can enhance UL coverage and lessen latency, but also is the only solution which can benefit downlink and uplink capacity simultaneously, and the unique solution to boost system performance of coverage and capacity.
5G Uplink Enhancement Technology White Paper