Indoor Coexistence Analysis Among 5G New Radio, LTE-A and NB-IoT in the 700 MHz Band

This work reports a common indoor experimental coexistence performance analysis among 5G New Radio (5G NR), 4G Long Term Evolution Advanced Pro (LTE-A Pro) and Narrowband Internet of Things (NB-IoT), using co-channel and adjacent channels in the 700 MHz Band. The required frequency offset for the 4G and 5G generations simultaneous operation has been evaluated, as a function of the modulation scheme in order to minimize the adjacent channel interference. A suitable management of the numerology and allocating time-frequency resources, configuring CORESET, enables a peaceful coexistence, as well as high performance for all evaluated systems. Experimental results demonstrate an efficient spectrum sharing of 10 MHz-bandwidth for a 5G NR, an LTE-A Pro and three NB-IoT downlink carriers, aiming to take advantage of 700 MHz propagation aspects for the current 4G and future 5G. Constellation and error vector magnitude (EVMRMS) in accordance to the 3GPP requirements reinforce the successful 4G and 5G spectrum refarming implementation.