Method and apparatus for sending transmission control protocol tcp data packet and system

An apparatus for sending a Transmission Control Protocol (TCP) data packet, wherein the apparatus comprises:

• a processor;
• and
• a non-transitory computer readable medium which contains computer-executable instructions;
• the processor is configured to execute the computer-executable instructions to perform operations comprising:
• obtaining a first round-trip time of sending a TCP data packet in a network;
• determining a second round-trip time, wherein the second round-trip time is a round-trip time that exists when a congestion window that is determined according to a first algorithm and a congestion window that is determined according to a second algorithm have an equal size, wherein in the first algorithm an increase step size of the congestion window is determined according to the first round-trip time, in the second algorithm an increase step size of the congestion window is determined according to the first round-trip time and a target throughput, and the target throughput is a throughput expected to be obtained for a service corresponding to the TCP data packet;
• using the congestion window determined according to the first algorithm as a first congestion window when the first round-trip time is longer than the second round-trip time;
• using the congestion window determined according to the second algorithm as the first congestion window when the first round-trip time is shorter than or equal to the second round-trip time;
• and
• sending the TCP data packet by using the first congestion window.

A system, wherein the system comprises a server and a terminal, wherein the server is in communication connection with the terminal by using a network;

• and
• the server is configured to:
• obtain a first round-trip time of sending a TCP data packet to the terminal in a network;
• determine a second round-trip time, wherein the second round-trip time is a round-trip time that exists when a congestion window that is determined according to a first algorithm and a congestion window that is determined according to a second algorithm have an equal size, wherein in the first algorithm an increase step size of the congestion window is determined according to the first round-trip time, in the second algorithm an increase step size of the congestion window is determined according to the first round-trip time and a target throughput, and the target throughput is a throughput expected to be obtained for a service corresponding to the TCP data packet;
• use the congestion window determined according to the first algorithm as a first congestion window when the first round-trip time is longer than the second round-trip time;
• use the congestion window determined according to the second algorithm as the first congestion window when the first round-trip time is shorter than or equal to the second round-trip time;
• and
• send the TCP data packet by using the first congestion window to the terminal by using the network.

A system, wherein the system comprises a server, a first agent device, and a terminal, wherein the first agent device is in communication connection both with the server and the terminal;

• the server is configured to send a Transmission Control Protocol (TCP) data packet to the terminal by using the first agent device that acts as an agent;
• and
• the first agent device is configured to:
• obtain a first round-trip time of sending the TCP data packet to the terminal in a network;
• determine a second round-trip time, wherein the second round-trip time is a round-trip time that exists when a congestion window that is determined according to a first algorithm and a congestion window that is determined according to a second algorithm have an equal size, wherein in the first algorithm an increase step size of the congestion window is determined according to the first round-trip time, in the second algorithm an increase step size of the congestion window is determined according to the first round-trip time and a target throughput, and the target throughput is a throughput expected to be obtained for a service corresponding to the TCP data packet;
• use the congestion window determined according to the first algorithm as a first congestion window when the first round-trip time is longer than the second round-trip time;
• use the congestion window determined according to the second algorithm as the first congestion window when the first round-trip time is shorter than or equal to the second round-trip time;
• and
• act as an agent of the server to send the TCP data packet received from the server by using the first congestion window to the terminal.