A method for performing a handover between core networks in a communication network, comprising: receiving (2602, 1012), at an interworking core network serving node being an evolved mobility management entity, eMME, for interworking between a first core network supporting a first radio access technology, RAT, and a second core network supporting a second RAT, a handover request for performing a handover of a user equipment from a first wireless access network utilizing the first RAT to a second wireless access network utilizing the second RAT, the handover request including an identifier of a target cell within the second wireless access network, wherein the interworking core network serving node is located within the second core network; identifying (2604, 1014), by the interworking core network serving node, a first core network serving node within the second core network that provides control plane functionality within the second core network and is separate from the interworking core network serving node based on the identifier of the target cell, wherein the first core network serving node is a control plane mobility management function, CP-MM, and/or control plane session management function, CP-SM; and forwarding (2606, 1016) the handover request to the first core network serving node to complete the handover; wherein the handover request is received at the interworking core network serving node from a second core network serving node within the first core network; wherein the interworking core network serving node acts as a CP-MM and/or CP-SM for CP-MM and/or CP-SM controlled handovers, selects a target CP-MM and/or CP-SM based on the identifier of the target cell, and forwards the handover request to the target CP-MM and/or CP-SM; wherein the first RAT comprises a legacy RAT that provides connectivity to one or more data networks via the first core network based on one or more Packet Data Network, PDN, connections; wherein the second RAT comprises a fifth generation RAT that provides connectivity to the one or more data networks via the second core network based on at least one or more Data Network Session, DNS, connections, each including one or more data flows, each associated with a different respective Internet Protocol, IP, address. receiving (2602, 1012), at an interworking core network serving node being an evolved mobility management entity, eMME, for interworking between a first core network supporting a first radio access technology, RAT, and a second core network supporting a second RAT, a handover request for performing a handover of a user equipment from a first wireless access network utilizing the first RAT to a second wireless access network utilizing the second RAT, the handover request including an identifier of a target cell within the second wireless access network, wherein the interworking core network serving node is located within the second core network; identifying (2604, 1014), by the interworking core network serving node, a first core network serving node within the second core network that provides control plane functionality within the second core network and is separate from the interworking core network serving node based on the identifier of the target cell, wherein the first core network serving node is a control plane mobility management function, CP-MM, and/or control plane session management function, CP-SM; and forwarding (2606, 1016) the handover request to the first core network serving node to complete the handover; wherein the handover request is received at the interworking core network serving node from a second core network serving node within the first core network; wherein the interworking core network serving node acts as a CP-MM and/or CP-SM for CP-MM and/or CP-SM controlled handovers, selects a target CP-MM and/or CP-SM based on the identifier of the target cell, and forwards the handover request to the target CP-MM and/or CP-SM; wherein the first RAT comprises a legacy RAT that provides connectivity to one or more data networks via the first core network based on one or more Packet Data Network, PDN, connections; wherein the second RAT comprises a fifth generation RAT that provides connectivity to the one or more data networks via the second core network based on at least one or more Data Network Session, DNS, connections, each including one or more data flows, each associated with a different respective Internet Protocol, IP, address.