Cross-Domain Communication Method and Communication Device

原文（中国語）

In a communication method, a first session management function (SMF) determines, based on a group identifier of a group to which a target user equipment belongs, a first user plane function (UPF) connected to a first user equipment, where the first user equipment is an access point user equipment in the group; the first SMF sends an Internet Protocol (IP) address of the target user equipment and/or the group identifier to the first UPF; and the first UPF establishes a General Packet Radio Service (GPRS) Tunneling Protocol User Plane (GTP-U) tunnel between the first UPF and the second UPF, and stores a correspondence between the IP address and the GTP-U tunnel to implement packet forwarding.