Method for a system comprising a Long-Term Evolution Radio Access Node, LTE RAN, a Next Generation Radio Access Node, NG RAN, an Access and Mobility Management Function, AMF, a Mobility Management Entity, MME, a Serving Gateway, SGW, a Visitor Session Management Function, V-SMF, the method comprising - the NG RAN, denoted source RAN, deciding that the UE should be handed over to the LTE RAN, denoted target RAN, and sending a Handover Required message to the AMF, - the AMF determining from a 'Target eNB Identifier' IE of the Handover Required message that the type of handover is a Handover to E-UTRAN, - the AMF selecting an MME, and - sending Nsmf_PDU Session_Context Request to the V-SMF to request for each PDU Session associated with 3GPP access, even for PDU sessions without user plane currently, that is, also for PDU sessions not included in the Handover Required message received from NG RAN, to provide SM Context that also includes mapped EPS Bearer Contexts, - the AMF receiving a Nsmf_PDU Session_Context Request response, - the AMF issuing a relocation request to the MME, the relocation request also includes PDN connection information for SMFs holding a PDU session without user plane, UP; - the MME and SGW engaging (4, 5) in create session request and response messaging, - the MME issuing a handover request to the LTE RAN, - the LTE RAN allocating resources or bearers requested by MME even though said resources or said bearers are not included in a transparent source to target container from the source RAN, - the LTE RAN including in the target to source transparent container, the bearers requested by the source RAN and requested by the core network. a Long-Term Evolution Radio Access Node, LTE RAN, a Next Generation Radio Access Node, NG RAN, an Access and Mobility Management Function, AMF, a Mobility Management Entity, MME, a Serving Gateway, SGW, a Visitor Session Management Function, V-SMF, the method comprising - the NG RAN, denoted source RAN, deciding that the UE should be handed over to the LTE RAN, denoted target RAN, and sending a Handover Required message to the AMF, - the AMF determining from a 'Target eNB Identifier' IE of the Handover Required message that the type of handover is a Handover to E-UTRAN, - the AMF selecting an MME, and - sending Nsmf_PDU Session_Context Request to the V-SMF to request for each PDU Session associated with 3GPP access, even for PDU sessions without user plane currently, that is, also for PDU sessions not included in the Handover Required message received from NG RAN, to provide SM Context that also includes mapped EPS Bearer Contexts, - the AMF receiving a Nsmf_PDU Session_Context Request response, - the AMF issuing a relocation request to the MME, the relocation request also includes PDN connection information for SMFs holding a PDU session without user plane, UP; - the MME and SGW engaging (4, 5) in create session request and response messaging, - the MME issuing a handover request to the LTE RAN, - the LTE RAN allocating resources or bearers requested by MME even though said resources or said bearers are not included in a transparent source to target container from the source RAN, - the LTE RAN including in the target to source transparent container, the bearers requested by the source RAN and requested by the core network. - the NG RAN, denoted source RAN, deciding that the UE should be handed over to the LTE RAN, denoted target RAN, and sending a Handover Required message to the AMF, - the AMF determining from a 'Target eNB Identifier' IE of the Handover Required message that the type of handover is a Handover to E-UTRAN, - the AMF selecting an MME, and - sending Nsmf_PDU Session_Context Request to the V-SMF to request for each PDU Session associated with 3GPP access, even for PDU sessions without user plane currently, that is, also for PDU sessions not included in the Handover Required message received from NG RAN, to provide SM Context that also includes mapped EPS Bearer Contexts, - the AMF receiving a Nsmf_PDU Session_Context Request response, - the AMF issuing a relocation request to the MME, the relocation request also includes PDN connection information for SMFs holding a PDU session without user plane, UP; - the MME and SGW engaging (4, 5) in create session request and response messaging, - the MME issuing a handover request to the LTE RAN, - the LTE RAN allocating resources or bearers requested by MME even though said resources or said bearers are not included in a transparent source to target container from the source RAN, - the LTE RAN including in the target to source transparent container, the bearers requested by the source RAN and requested by the core network.