To endorse 5^th generation communication networks, which have promising parameters like higher spectrum efficiency, larger massive connectivity, higher capacity gain, low latency, fewer interferences, good power efficiency, etc., a qualitative and authoritative access scheme has been nominated, i.e., Non-Orthogonal Multiple Access (NOMA). This paper describes an all encompassing look at different categories of NOMA signal transmission schemes (like scrambling, interleaving, spreading based, and coding based NOMAS), as well as some intent points of interference (like inter-cell and intra-cell interferences, etc.). The performance of different multiple accessing schemes of NOMA is summarized and the manifestations of interferences in 5G communications are enumerated in detail. This chronology provides anticipated evidence that the 5G spectrum will play a significant role in future communication networks.