LTE supports up to 20 MHz carrier bandwidth through a 15kHz interval between OFDM subcarriers (a fixed OFDM parameter configuration). To support richer spectrum types/bands (to connect as many devices as possible, 5G will take advantage of all available spectrum, such as millimetre microwaves, unlicensed bands) and deployment methods. 5G NR will introduce scalable OFDM interval parameter configuration. This is critical because the FFT (Fast Fourier Transform) must not increase the complexity of the processing as it expands the size of the bandwidth. In order to support different channel widths of multiple deployment modes,5GNR must adapt to different parameter configurations under the same deployment to improve multi-channel transmission efficiency under a unified framework. In addition,5G NR can also realize carrier aggregation across parameters, such as converged millimeter-wave and carrier at frequencies below 6GHz.