Hereinafter, for each DC scenario described in FIG. 10, a UE operation related to activation of a single UL carrier will be described.
1) Scenario 1: Typical DC Scenario of FIG. 10-(a)
In this case, an FDD carrier of LTE and a TDD carrier of NR may be dual-connected, or a FDD carrier of LTE and an FDD carrier of NR (including an FDD operation similar to TDD such as partial data/short PUCCH transmission) may be dual-connected.
FIG. 11 shows UL transmission based on a dual connectivity of LTE and NR according to an embodiment of the present disclosure. When a CG of NR uses a TDD operation of a DL-based or UL-based slot structure and different numerologies can be used between two CGs, only some resources of a subframe are necessary for NR UL transmission. If a subframe/slot structure of LTE/NR of FIG. 11 is used, for UL transmission of NR in a slot m, the entire subframe n may not be used for UL transmission of LTE. In particular, in slots m+4 and m+5, although only a very small portion is required for UL transmission of NR, the entire subframe may not be used for UL transmission of LTE.
