A User Equipment , UE, comprising: a transmission and reception unit ; and a controller , wherein the transmission and reception unit is configured to: in a Protocol Data Unit, PDU, session establishment procedure, transmit, over 3GPP access, a PDU Session Establishment Request message, wherein the transmission and reception unit does not transmit information indicating that establishment of Multi-Access PDU Session is requested; and receive, over the 3GPP access, a PDU Session Establishment Accept message including routing rules for Multi-Access PDU Session and identification information of Multi-Access PDU Session to be established, the controller is configured to recognize that Multi-Access PDU Session is established, based on receiving the PDU Session Establishment Accept message, and that a first connection of the Multi-Access PDU Session over the 3GPP access is established, the transmission and reception unit is further configured to: transmit, over non-3GPP access, a first control message, and receive, over the non-3GPP access, a second control message including the identification information of the Multi-Access PDU Session, and the controller is configured to recognize that a second connection of the Multi-Access PDU Session over the non-3GPP access is established. a transmission and reception unit ; and a controller , in a Protocol Data Unit, PDU, session establishment procedure, transmit, over 3GPP access, a PDU Session Establishment Request message, wherein the transmission and reception unit does not transmit information indicating that establishment of Multi-Access PDU Session is requested; and receive, over the 3GPP access, a PDU Session Establishment Accept message including routing rules for Multi-Access PDU Session and identification information of Multi-Access PDU Session to be established, transmit, over 3GPP access, a PDU Session Establishment Request message, wherein the transmission and reception unit does not transmit information indicating that establishment of Multi-Access PDU Session is requested; and receive, over the 3GPP access, a PDU Session Establishment Accept message including routing rules for Multi-Access PDU Session and identification information of Multi-Access PDU Session to be established, the controller is configured to recognize that Multi-Access PDU Session is established, based on receiving the PDU Session Establishment Accept message, and that a first connection of the Multi-Access PDU Session over the 3GPP access is established, that Multi-Access PDU Session is established, based on receiving the PDU Session Establishment Accept message, and that a first connection of the Multi-Access PDU Session over the 3GPP access is established, the transmission and reception unit is further configured to: transmit, over non-3GPP access, a first control message, and receive, over the non-3GPP access, a second control message including the identification information of the Multi-Access PDU Session, and transmit, over non-3GPP access, a first control message, and receive, over the non-3GPP access, a second control message including the identification information of the Multi-Access PDU Session, and the controller is configured to recognize that a second connection of the Multi-Access PDU Session over the non-3GPP access is established. <EOS>