In the present disclosure, a narrowband Internet of Things (NB-IoT) device refers to a UE supporting radio access for cellular IoT. NB-IoT technology is aimed at indoor coverage improvement, support for large-scale low-speed devices, low latency sensitivity, very low device costs, low power consumption, and optimized network architecture.

Enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), and ultra reliable and low latency communication (URLLC) are proposed as representative usage scenarios in IMT-2020 having been discussed in the 3GPP recently.

New Radio (NR)

Recently, the 3rd generation partnership project (3GPP) has approved the “Study on New Radio Access Technology”, which is a study item for research on next-generation/5G radio access technology. On the basis of such a study item, Radio Access Network Working Group 1 (RAN WG1) has started discussions on frame structures, channel coding and modulation, waveforms, multiple access techniques, and the like for a new radio (NR).

The NR is required to be designed not only to provide an improved data transmission rate as compared with that of the LTE, but also to meet various requirements for each detailed and specific usage scenario.

In particular, the eMBB, mMTC, and URLLC are introduced as representative usage scenarios of the NR. It is necessary to design more flexible frame structures compared with that of the LTE for satisfying the requirements of the respective usage scenarios.

In addition, there is a necessity for designing resource allocation structures different from one another for each usage scenario, and, as a method to support this, there is growing sympathy for the necessity of multiplexing between numerologies different from one another through one NR frequency band.