A Review of Interference Challenges on Integrated 5GNR and NB-IoT Networks

Technology is expanding at a higher rate and because of this expansion there is a global transition from 4
^th
Generation (4G) to 5
^th
Generation (5G) due to the steep rise in the demand of users and challenges which are not addressed effectively by the 4G. The 3GPP standards which in full is 3
^rd
Generation Partnership Project have given 5G the name New Radio (NR) in which it reuses the spectrum allocated for both (NB-IoT) Narrowband Internet of Things and 4G. There are different elements which contribute to an interference named Narrowband Interference (NBI) which is caused by spectrum reuse of NR, NB-IoT and (LTE) Long Term Evolution, thus leads to mismatch of sampling rate and performance degradation. This paper presents a survey of these interference challenges. The main contribution of this paper is to comprehensively analyse different classifications to possibly assist the form of coexistence of 5GNR NB-IoT and LTE. Different approaches were analysed, their strength and limitations in various literatures, however the interference mitigation scheme is still an open gap determined.