Quality of service control method, device, and system

A communication device, comprising at least one processor and a memory, wherein the at least one processor is configured to couple to the memory, and read computer-executable instructions in the memory, wherein the computer-executable instructions, when executed by the at least one processor, cause the at least one processor to:

• receive a first message from an access gateway function entity, wherein the first message comprises a correspondence between a quality of service (QoS) file and a virtual local area network (VLAN) priority, and the correspondence between the QoS file and the VLAN priority comprises a correspondence between a first QoS file and a first VLAN priority;
• determine, based on the correspondence, that a VLAN priority corresponding to the first QoS file is the first VLAN priority, wherein the first QoS file is a QoS file corresponding to a to-be-sent uplink data packet;
• and
• send the uplink data packet to the access gateway function entity, wherein the uplink data packet carries the first VLAN priority.

A quality of service (QoS) control system, wherein the QoS control system comprises an access gateway function entity and a session management function entity, wherein

• the session management function entity is configured to:
• obtain a correspondence between a QoS file and a virtual local area network (VLAN) priority, and send a second message to the access gateway function entity, wherein the second message comprises the correspondence between the QoS file and the VLAN priority, and the correspondence between the QoS file and the VLAN priority comprises a correspondence between a first QoS file and a first VLAN priority;
• and
• the access gateway function entity is configured to:
• receive the second message from the session management function entity, and send a first message to a terminal, wherein the first message comprises the correspondence between the QoS file and the VLAN priority;
• and receive an uplink data packet from the terminal, and perform QoS control on the uplink data packet based on the first VLAN priority carried in the uplink data packet, wherein a QoS file corresponding to the uplink data packet is the first QoS file.