A target radio access network, RAN, node configured to be connected to a Fifth Generation, 5G, core network, the target RAN node comprising: at least one memory; and at least one processor coupled to the at least one memory, characterized in that the at least one processor is configured to: receive, from a 5G core network node of the core network, a handover request message requesting a handover of a radio terminal from a source eNodeB connected to a Mobility Management Entity, MME, to the target RAN node connected to the 5G core network, the handover using an interface between the MME and the 5G core network node, the handover request message including slice information identifying a network slice and flow information related to at least one PDU session to be established in the 5G core network in order to transfer at least one packet flow of the radio terminal; derive, from the flow information or from the slice information, radio resource configuration information; and send to the 5G core network node, in response to the handover request message, a handover request acknowledge message containing a Target to Source Transparent Container, wherein the Target to Source Transparent Container includes the radio resource configuration information and is to be forwarded to the source eNodeB via the 5G core network node and the MME, wherein the radio resource configuration information includes information indicating a mapping between a bearer for the radio terminal and at least one packet flow for the radio terminal. at least one memory; and at least one processor coupled to the at least one memory, characterized in that the at least one processor is configured to: receive, from a 5G core network node of the core network, a handover request message requesting a handover of a radio terminal from a source eNodeB connected to a Mobility Management Entity, MME, to the target RAN node connected to the 5G core network, the handover using an interface between the MME and the 5G core network node, the handover request message including slice information identifying a network slice and flow information related to at least one PDU session to be established in the 5G core network in order to transfer at least one packet flow of the radio terminal; derive, from the flow information or from the slice information, radio resource configuration information; and send to the 5G core network node, in response to the handover request message, a handover request acknowledge message containing a Target to Source Transparent Container, wherein the Target to Source Transparent Container includes the radio resource configuration information and is to be forwarded to the source eNodeB via the 5G core network node and the MME, receive, from a 5G core network node of the core network, a handover request message requesting a handover of a radio terminal from a source eNodeB connected to a Mobility Management Entity, MME, to the target RAN node connected to the 5G core network, the handover using an interface between the MME and the 5G core network node, the handover request message including slice information identifying a network slice and flow information related to at least one PDU session to be established in the 5G core network in order to transfer at least one packet flow of the radio terminal; derive, from the flow information or from the slice information, radio resource configuration information; and send to the 5G core network node, in response to the handover request message, a handover request acknowledge message containing a Target to Source Transparent Container, wherein the Target to Source Transparent Container includes the radio resource configuration information and is to be forwarded to the source eNodeB via the 5G core network node and the MME, wherein the radio resource configuration information includes information indicating a mapping between a bearer for the radio terminal and at least one packet flow for the radio terminal.