3GPP assigned 3.5G as 5G spectrum; TDD has a first-runner advantage.
TDD has a wide block of continuous spectrum, which naturally fulfills the huge bandwidth demands of 5G. It is a good choice for huge capacity demands thanks to its intrinsic properties, especially for hotspots and capacity.
Operators can deploy 3.5G LTE networks for business benefits and evolve smoothly to 5G if necessary.
The first use case would most likely to be FWA, a scenario in which Huawei has rich experience.