The proposed technology concerns network units and, which are typically remotely located, and from the perspective of one of the network units, the other network unit is therefore referred to as a remote network unit. The network unit is configured to provide Radio Resource Control, RRC, and/or Packet Data Convergence Protocol, PDCP, protocol functionality, and comprises an X2 unit for providing an X2 interface between the RRC and/or PDCP protocol functionality of the network unit and lower protocol layer(s) and/or sub-layer(s) of the remote network unit. The network unit is configured to provide Radio Link Control, RLC, and/or Medium Access Control, MAC, protocol functionality, and comprises an X2 unit for providing an X2 interface between the RLC and/or MAC protocol functionality of the network unit and higher protocol layer(s) and/or sub-layer(s) of the remote network unit.