Method of controlling congestion, apparatus for controlling congestion and communication system

An apparatus for controlling congestion in a communication scheme using a lower layer that performs a first congestion control and an upper layer that performs a second congestion control different from the first congestion control, the apparatus comprising:

• a detector that detects a congestion in the lower layer;
• a notifier that notifies, from the lower layer to upper layer, the occurrence of the congestion and congestion control information related to the congestion;
• a processor that sets, in the upper layer, an output rate for each of at least one congestion-related upper-layer session that is processed in the upper layer and is related to the congestion, and
• a management table that retains a control rate in the lower layer, the control rate being included in the congestion control information, and a weight for each of the at least one congestion-related upper-layer session, in the upper layer, the weight indicating a priority of the congestion-related upper-layer session,
• wherein the weight is dynamically set to each of the at least one congestion-related upper-layer session, based on a ratio of an output size for the congestion-related upper-layer session at time of the occurrence of the congestion, in the management table.

A system comprising an information processing apparatus and a host apparatus that are connected to each other via a delay apparatus, the system communicating in a communication scheme using a lower layer that performs a first congestion control and an upper layer that performs a second congestion control different from the first congestion control, the information processing apparatus comprising:

• a detector that detects a congestion in the lower layer;
• a notifier that notifies, from the lower layer to upper layer, the occurrence of the congestion and congestion control information related to the congestion;
• a processor that sets, in the upper layer, an output rate for each of at least one congestion-related upper-layer session that is processed in the upper layer and is related to the congestion;
• and
• a management table that retains a control rate in the lower layer, the control rate being included in the congestion control information, and a weight for each of the at least one congestion-related upper-layer session, in the upper layer, the weight indicating a priority of the congestion-related upper-layer session,
• wherein the weight is dynamically set to each of the at least one congestion-related upper-layer session, based on a ratio of an output size for the congestion-related upper-layer session at time of the occurrence of the congestion, in the management table.

A non-transitory computer-readable recording medium having stored therein, a congestion control program in a communication scheme using a lower layer that performs a first congestion control and an upper layer that performs a second congestion control different from the first congestion control, the program causing a computer to:

• detect a congestion in the lower layer;
• notify, from the lower layer to upper layer, the occurrence of the congestion and congestion control information related to the congestion;
• and
• set, in the upper layer, an output rate for each of at least one congestion-related upper-layer session that is processed in the upper layer and is related to the congestion;
• and
• retain a control rate in the lower layer, the control rate being included in the congestion control information, and a weight for each of the at least one congestion-related upper-layer session, in the upper layer, the weight indicating a priority of the congestion-related upper-layer session,
• wherein the weight is dynamically set to each of the at least one congestion-related upper-layer session, based on a ratio of an output size for the congestion-related upper-layer session at time of the occurrence of the congestion.