5G‐NR Radio Interface – Operations on the Frequency Bands

Abstract

Operations on the 5G‐NR and 4G‐long‐term evolution (LTE) frequency bands make it possible to increase cell coverage and/or improve data rate transmission on the uplink (UL) and the downlink. Dynamic Spectrum Sharing is a technology that allows the deployment of both 4G LTE and 5G‐NR in the same frequency band. Carrier aggregation (CA) consists of adding different 5G‐NR radio channels. CA increases the bandwidth by combining several carriers. The radio channel aggregation notation determines the bandwidth class of the radio channel by the aggregation of multiple DC radio channels and the Fallback Group. The maximum 5G carrier band depends on the band number and numerology. Carrier aggregation increases radio data rates by adding the bandwidth of each CC radio channel. The supplementary UL bandwidth is generally smaller than the traditional band, but the carrier frequency is lower, thereby improving cell coverage for the uplink.