Dynamic adjustment method and apparatus for PDU session

A method for a protocol data unit (PDU) session comprising:

• obtaining, by a terminal device, from a core network device, a first message comprising a first parameter, wherein the first message instructs the terminal device to obtain a measurement result of the first parameter, wherein the measurement result comprises statistical information related to a PDU session, and wherein the first message further indicates a network resource status of a first application;
• obtaining, from the core network device, a second message comprising a second time period;
• and
• sending the measurement result to the core network device.

A terminal device for a protocol data unit (PDU) session-comprising:

• a receiver configured to obtain, from a core network device, a first message comprising:
• a network resource status of a first application, wherein the first application is configured to transmit data;
• and
• a first parameter, wherein the first message instructs the terminal device to collect statistics on a measurement result of the first parameter, wherein the measurement result comprises statistical information related to the PDU session, wherein the receiver is further configured to obtain a second message from the core network device, and wherein the second message comprises first application information;
• a transmitter coupled to the receiver and configured to send the measurement result to the core network device;
• and
• a processor configured to perform a first operation when the PDU session does not exist, and wherein the first operation is configured to cause the transmitter to send, to the core network device, a PDU session establishment request message comprising a first application identifier.