Data packet transmission method, communication device, computer-readable storage medium and computer program product

1 . A data packet transmission method, comprising:

receiving, by a policy control function (PCF) network element, a round trip time request of a service flow sent by an application function (AF) network element, the round trip time request including a first user plane function (UPF) side round trip time threshold value;

generating, by the PCF network element, in response to a network exposure function (NEF) network element accepting the round trip time request, a first quality of service detection policy of the service flow that includes the first UPF side round trip time threshold value; and

sending, by the PCF network element, the first quality of service detection policy to a session management function (SMF) network element, wherein

in response to receiving the first quality of service detection policy, a quality of service detection request of a first UPF network element is generated and sent by the SMF network element to the first UPF network element;

in response to receiving the quality of service detection request of the first UPF network element, a UPF side round trip time overtime message is generated by the first UPF network element when a current UPF side round trip time of the service flow between a terminal and the first UPF network element exceeds the first UPF side round trip time threshold value; and

in response to receiving the UPF side round trip time overtime message, a processing mode is determined by the PCF network element for the service flow to meet the round trip time request.

2 . The method according to claim 1 , further comprising:

receiving, by the PCF network element, the UPF side round trip time overtime message sent by the first UPF network element; and

determining, by the PCF network element, the processing mode for the service flow according to the UPF side round trip time overtime message, the processing mode meeting the round trip time request.

3 . The method according to claim 1 , further comprising:

generating, by the PCF network element, in response to the NEF network element accepting the round trip time request, a first policy and charging control rule of the service flow that meets the first UPF side round trip time threshold value; and

sending, by the PCF network element, the first policy and charging control rule to the SMF network element.

4 . The method according to claim 3 , wherein the generating the first policy and charging control rule comprises:

determining, by the PCF network element, an uplink service transmission delay threshold value and a downlink service transmission delay threshold value for a first quality of service flow according to the first UPF side round trip time threshold value; and

generating, by the PCF network element, the first policy and charging control rule according to the uplink service transmission delay threshold value and the downlink service transmission delay threshold value for the first quality of service flow, wherein the first policy and charging control rule comprises the uplink service transmission delay threshold value and the downlink service transmission delay threshold value for the first quality of service flow, wherein

a sum of the uplink service transmission delay threshold value and the downlink service transmission delay threshold value for the first quality of service flow is smaller than or equal to the first UPF side round trip time threshold value.

5 . The method according to claim 1 , wherein

the round trip time request further comprises a suggested processing mode after exceeding the first UPF side round trip time threshold value; and

the PCF network element determines the processing mode for the service flow according to the UPF side round trip time overtime message by:

determining the processing mode for the service flow according to at least one of the suggested processing mode or a local policy of the PCF network element.

6 . The method according to claim 1 , further comprising:

determining, by the PCF network element, a first radio round trip time threshold value according to the first UPF side round trip time threshold value;

generating, by the PCF network element, a second policy and charging control rule and a second quality of service detection policy of the service flow that meet the first radio round trip time threshold value, the second quality of service detection policy comprising the first radio round trip time threshold value;

sending, by the PCF network element, the second policy and charging control rule and the second quality of service detection policy to the SMF network element; wherein

in response to receiving the second policy and charging control rule, quality of service Profile file information of a first quality of service flow is generated and sent, by the SMF network element, to a network device;

in response to receiving the second quality of service detection policy, a quality of service detection request of the network device is generated and sent, by the SMF network element, to the network device;

in response to receiving the quality of service detection request, a current radio round trip time of the service flow between the terminal and the network device is detected by the network device, and a radio round trip time overtime message is reported by the network device when the current radio round trip time exceeds the first radio round trip time threshold value; and

the SMF network element is configured to receive the radio round trip time overtime message reported by the network device.

7 . The method according to claim 6 , wherein the generating the second policy and charging control rule comprises:

determining, by the PCF network element, an uplink service transmission delay threshold value and a downlink service transmission delay threshold value for the first quality of service flow according to the first radio round trip time threshold value; and

generating, by the PCF network element, the second policy and charging control rule according to the uplink service transmission delay threshold value and the downlink service transmission delay threshold value for the first quality of service flow, wherein the second policy and charging control rule comprises the uplink service transmission delay threshold value and the downlink service transmission delay threshold value for the first quality of service flow, wherein

a sum of the uplink service transmission delay threshold value and the downlink service transmission delay threshold value for the first quality of service flow is smaller than or equal to the first radio round trip time threshold value; and

the quality of service Profile file information meets the uplink service transmission delay threshold value and the downlink service transmission delay threshold value for the first quality of service flow.

8 . The method according to claim 1 , wherein

the UPF side round trip time overtime message comprises the current UPF side round trip time exceeding the first UPF side round trip time threshold value; and

the processing mode comprises:

adjusting the first UPF side round trip time threshold value according to the current UPF side round trip time exceeding the first UPF side round trip time threshold value to obtain a second UPF side round trip time threshold value that is greater than the first UPF side round trip time threshold value;

instructing the first UPF network element to detect the current UPF side round trip time of the service flow between the terminal and the first UPF network element;

initiating an update process of a protocol data unit session in response to a determination that the current UPF side round trip time of the service flow between the terminal and the first UPF network element exceeds the second UPF side round trip time threshold value, so as to select a second UPF network element;

instructing the second UPF network element to detect a current UPF side round trip time of the service flow between the terminal and the second UPF network element; and

adopting, in response to a determination that the current UPF side round trip time of the service flow between the terminal and the second UPF network element does not exceed the second UPF side round trip time threshold value, the second UPF network element to transmit the service flow.

9 . The method according to claim 1 , wherein the processing mode comprises at least one of:

continuing to transmit the service flow and to report a round trip time overtime message to the AF network element;

adjusting a configuration parameter of a network device;

selecting a second UPF network element to replace the first UPF network element;

adjusting a quality of service rule and quality of service Profile file information of the service flow to obtain an updated quality of service rule and updated quality of service Profile file information, and respectively sending the updated quality of service rule and the updated quality of service Profile file information to the terminal and the network device;

adjusting a round trip time threshold value parameter in quality of service detection of a first UPF side to obtain a second UPF side round trip time threshold value; or

interrupting transmission of the service flow.