Data transmission method, device, and system

A first communication device, comprising:

• one or more processors;
• and
• at least one non-transitory computer readable memory connected to the one or more processors and including computer program code, wherein the at least one non-transitory computer readable memory and the computer program code are configured, with the one or more processors, to cause the first communication device to at least perform:
• receiving a first data packet in a first direction from a second communication device, wherein the first direction is one of an uplink direction or a downlink direction;
• acquiring, by the first communication device, from a third communication device, policy rule information of the second communication device, wherein the policy rule information comprises at least an uplink transmission delay requirement for a service and further comprises a downlink transmission delay requirement for the service;
• receiving a second data packet in a second direction, wherein the second direction is one of an uplink direction or a downlink direction that is different from the first direction;
• adjusting a quality of service parameter of the second data packet in the second direction prior to sending the second data packet, and in response to a transmission delay requirement for the second direction not meeting a target transmission delay in the second direction, wherein the transmission delay requirement for the second direction is one of the uplink transmission delay requirement or the downlink transmission delay requirement of the policy rule information;
• and
• sending the second data packet in the second direction based on the quality of service parameter and further based on a total transmission delay requirement and a time point at which the first data packet in the first direction is sent from the second communication device;
• wherein the first data packet in the first direction comprises a time stamp that indicates the time point at which the first data packet in the first direction is sent from the second communication device, wherein the first data packet in the first direction and the second data packet in the second direction correspond to a same service, wherein the second data packet is a response to the first data packet, and wherein the total transmission delay requirement is a sum of the uplink transmission delay requirement and the downlink transmission delay requirement.

A communication system, comprising:

• a first communication device configured to:
• receive a first data packet in a first direction from a second communication device, wherein the first direction is one of an uplink direction or a downlink direction;
• acquire, from a third communication device, policy rule information of the second communication device, wherein the policy rule information comprises at least an uplink transmission delay requirement for a service and further comprises a downlink transmission delay requirement for the service;
• receive a second data packet in a second direction, wherein the second direction is one of an uplink direction or a downlink direction that is different from the first direction;
• adjust a quality of service parameter of the second data packet in the second direction prior to sending the second data packet, and in response to a transmission delay requirement for the second direction not meeting a target transmission delay in the second direction, wherein the transmission delay requirement for the second direction is one of the uplink transmission delay requirement or the downlink transmission delay requirement of the policy rule information;
• and
• send the second data packet in the second direction based on a total transmission delay requirement and a time point at which the first data packet in the first direction is sent from the second communication device, wherein the first data packet in the first direction comprises a time stamp that indicates the time point at which the first data packet in the first direction is sent, wherein the first data packet in the first direction and the second data packet in the second direction correspond to a same service, and wherein the total transmission delay requirement is a sum of the uplink transmission delay requirement and the downlink transmission delay requirement;
• and
• an application server configured to:
• receive, when the first direction is the uplink direction and the second direction is the downlink direction, the first data packet in the first direction from the first communication device, and send the second data packet in the second direction to the first communication device;
• or
• send, when the first direction is the downlink direction and the second direction is the uplink direction, the first data packet in the first direction to the first communication device, and receive the second data packet in the second direction from the first communication device;
• wherein the second communication device is one of the application server or a terminal device, and wherein the second data packet is a response to the first data packet.