A system for an enhanced X2 interface in a mobile operator core network, comprising: a Long Term Evolution, LTE, core network packet data network gateway, PGW; and a coordinating server (112, 600) positioned as a gateway between the LTE PGW and a 3GPP radio access network, RAN, comprising a plurality of evolved NodeB, eNodeB, (107, 108, 110), and positioned as a gateway between the LTE PGW and a Wi-Fi radio access network, RAN, comprising a plurality of Wi-Fi access points, AP, (105, 106), the Wi-Fi AP (105, 106) being controlled by a wireless local area network, WLAN, controller, the coordinating server (112, 600) being configured to: detect (202, 301) that an UE (101.102, 103, 104) is performing an inter-radio technology, inter-RAT, handover to or from an eNodeB (107, 108, 110) from or to an Wi-Fi AP (105, 106), act as a PGW proxy and anchor point for the user equipment, UE, (101.102, 103, 104) for enabling IP anchoring of the UE at the coordinating server, and perform a network address translation, NAT, (204, 304) for hiding IP address changes, perform an embedded evolved packet core, EPC, functionality for proxying and hiding EPC functions from the LTE core network, manage packet flows to and from the UE (101.102, 103, 104), so that packet flows going to and from the UE are delivered, even across radio access technologies, RATs, and provide coordination of the 3GPP RAN and the Wi-Fi RAN, and provide self-organizing network, SON, functions for the 3GPP RAN and the Wi-Fi RAN, wherein the coordinating server is configured to use an enhanced X2 interface between itself and the RAN nodes, including the plurality of eNodeB, (107, 108, 110) and the plurality of Wi-Fi AP (105, 106), for performing handover and SON functions. a Long Term Evolution, LTE, core network packet data network gateway, PGW; and a coordinating server (112, 600) positioned as a gateway between the LTE PGW and a 3GPP radio access network, RAN, comprising a plurality of evolved NodeB, eNodeB, (107, 108, 110), and positioned as a gateway between the LTE PGW and a Wi-Fi radio access network, RAN, comprising a plurality of Wi-Fi access points, AP, (105, 106), the Wi-Fi AP (105, 106) being controlled by a wireless local area network, WLAN, controller, the coordinating server (112, 600) being configured to: detect (202, 301) that an UE (101.102, 103, 104) is performing an inter-radio technology, inter-RAT, handover to or from an eNodeB (107, 108, 110) from or to an Wi-Fi AP (105, 106), act as a PGW proxy and anchor point for the user equipment, UE, (101.102, 103, 104) for enabling IP anchoring of the UE at the coordinating server, and perform a network address translation, NAT, (204, 304) for hiding IP address changes, perform an embedded evolved packet core, EPC, functionality for proxying and hiding EPC functions from the LTE core network, manage packet flows to and from the UE (101.102, 103, 104), so that packet flows going to and from the UE are delivered, even across radio access technologies, RATs, and provide coordination of the 3GPP RAN and the Wi-Fi RAN, and provide self-organizing network, SON, functions for the 3GPP RAN and the Wi-Fi RAN, wherein the coordinating server is configured to use an enhanced X2 interface between itself and the RAN nodes, including the plurality of eNodeB, (107, 108, 110) and the plurality of Wi-Fi AP (105, 106), for performing handover and SON functions. detect (202, 301) that an UE (101.102, 103, 104) is performing an inter-radio technology, inter-RAT, handover to or from an eNodeB (107, 108, 110) from or to an Wi-Fi AP (105, 106), act as a PGW proxy and anchor point for the user equipment, UE, (101.102, 103, 104) for enabling IP anchoring of the UE at the coordinating server, and perform a network address translation, NAT, (204, 304) for hiding IP address changes, perform an embedded evolved packet core, EPC, functionality for proxying and hiding EPC functions from the LTE core network, manage packet flows to and from the UE (101.102, 103, 104), so that packet flows going to and from the UE are delivered, even across radio access technologies, RATs, and provide coordination of the 3GPP RAN and the Wi-Fi RAN, and provide self-organizing network, SON, functions for the 3GPP RAN and the Wi-Fi RAN, wherein the coordinating server is configured to use an enhanced X2 interface between itself and the RAN nodes, including the plurality of eNodeB, (107, 108, 110) and the plurality of Wi-Fi AP (105, 106), for performing handover and SON functions.