In FDD, the UL and DL frame timing is slightly skewed in time and who is earlier by how much?

Question

How 8CA in DL and 4CA in UL work? How much throuhow 8CA in DL and 4CA in UL work? how much throughput will get? Which ue support this much throughput? Which LTE specs support this feature? Which ue support this much throughput?

Answer 1

UE should be synchronized with eNodeB. eNodeB expect UL data send by UE should be received at eNB in the same time frame in which eNB sends data in DL to UE. To avoid delay in UL eNB sends TA to UE. UE transmits UL data earlier using the TA value.