I heard a new term CUPS and did some googling and came to know about this term. CUPS stands for control and user plane segregation. In LTE network, control and user planes both are used as a single node. In LTE network, SGW does buffering of any incoming data for and SGW node was doing buffering when UE in RRC-IDLE mode. I can understand control part would be same as GTP-C but how user plane of 5G network would be implemented ? Does the 3GGP standard talk about implementation of user plane ? Would it be GTP based or something else ?