What is RRH? Radios placed on top of roof tops or towers. These are the core parts of the macroCell and Small cell transmission technology. As an MEC application, Private LTE is considered a small cell. In wireless system technologies such as GSM, CDMA, UMTS, LTE the radio equipment is remote to the BTS/NodeB/eNodeB. The equipment is used to extend the coverage of a BTS/NodeB/eNodeB in challenging environments such as rural areas or tunnels. They are generally connected to the BTS/NodeB/eNodeB via a fiber optic cable using Common Public Radio Interface protocols.