a method for communicating between nodes in a communication system . communicating in a first node in a radio access network and a second node in a core network using messages associated with a first set of operations connecting the first node to the core network . communicating in the first node with other nodes of the radio access network using messages associated with a second set of operations connecting the radio access network nodes . communicating in the first node with a third node using messages associated with a third set of operations , the third set of operations providing at least part of the operations provided by the first and second set of operations . the scalability of the core network nodes is enhanced when the number of the radio access network nodes connecting to the core network nodes increases .