Wireless communication method and device

A first user plane function entity comprising:

• a memory configured to store instructions;
• and
• a processor coupled to the memory and configured to execute the instructions to cause the first user plane function entity to:
• receive, from a session management function entity, a multicast address of a group and session information of second terminals, wherein the group comprises a first terminal and the second terminals, and wherein the session information comprises information about a tunnel between second user plane function entities in which the second terminals are located and the first user plane function entity;
• receive, from the first terminal, first service data, wherein a destination address of the first service data is the multicast address;
• duplicate, when the destination address of the first service data matches the multicast address of the group, the first service data to obtain copies of the first service data;
• and
• send, to each terminal of the group except the first terminal and based on the multicast address and the session information, each of the copies of the first service data.

A wireless communication method comprising:

• sending, by a session management function entity to a first user plane function entity, a multicast address of a group and session information of second terminals, wherein the group comprises a first terminal and the second terminals, and wherein the session information comprises information about a tunnel between second user plane function entities in which the second terminals are located and the first user plane function entity;
• receiving, by the first user plane function entity and from the session management function entity, the multicast address and the session information;
• receiving, by the first user plane function entity and from the first terminal in the group, first service data, wherein a destination address of the first service data is the multicast address;
• duplicating, by the first user plane function entity when the destination address of the first service data matches the multicast address of the group, the first service data to obtain copies of the first service data;
• and
• sending, by the first user plane function entity, to each terminal of the group except the first terminal, and based on the multicast address and the session information, each of the copies of the first service data.

A communication system comprising:

• a session management function entity configured to send a multicast address of a group and session information of second terminals, wherein the group comprises a first terminal and the second terminals, and wherein the session information comprises information about a tunnel between second user plane function entities in which the second terminals are located and a first user plane function entity;
• and
• the first user plane function entity configured to:
• receive, from the session management function entity, the multicast address and the session information;
• receive, from the first terminal in the group, first service data, wherein a destination address of the first service data is the multicast address;
• duplicate, when the destination address of the first service data matches the multicast address of the group, the first service data to obtain copies of the first service data;
• and
• send, to each terminal of the group except the first terminal and based on the multicast address and the session information, each of the copies of the first service data.