Congestion control system, congestion control method, and communication unit

A congestion control method comprising:

• sampling a received packet based on a predetermined algorithm and transmitting a feedback message to a transmission source of the packet, when detecting congestion;
• controlling a target rate based on a reception situation of the feedback message;
• and
• setting the target rate to an initial value at an initialization timing which does not depend on the feedback message.

A non-transitory computer-readable recording medium in which a computer-executable communication unit control program is stored,

• wherein an external communication unit samples a received packet based on a predetermined algorithm, when detecting congestion in itself, and transmits a feedback message to a transmission source of the sampled packet, and
• wherein said communication unit control program makes a computer of a communication unit function as:
• transmitting means for transmitting the packet to an external communication unit;
• control means for controlling a target rate based on a reception situation of the feedback message;
• and
• initializing means for setting the target rate to an initial value at an initialization timing which does not depend on the feedback message.