Registration method, session establishment method, terminal, and amf entity

A terminal, comprising:

• a transmitter, configured to send a first message to an access and mobility management function (AMF) entity, the first message comprising first network slice selection information, second network slice selection information, and information for requesting to establish a protocol data unit (PDU) session, wherein the first network slice selection information is used for selection of a session management control function (SMF) entity in a visited public land mobile network (VPLMN), and the second network slice selection information is used for selection of a SMF entity in a home public land mobile network (HPLMN);
• and
• a receiver, coupled to the transmitter and configured to receive a second message from the AMF entity, the second message comprising PDU session establishment accept information.

A non-transitory computer-readable medium storing computer instructions for execution by one or more processors, wherein the computer instructions instruct the one or more processors to perform the operations of:

• sending a first message to an access and mobility management function (AMF) entity, the first message comprising first network slice selection information, second network slice selection information, and information for requesting to establish a protocol data unit (PDU) session, wherein the first network slice selection information is used for selection of a session management control function (SMF) entity in a visited public land mobile network (VPLMN), and the second network slice selection information is used for selection of a SMF entity in a home public land mobile network (HPLMN);
• and
• receiving a second message from the AMF entity, the second message comprising PDU session establishment accept information.