Communication apparatus

A control method for a transmission apparatus connectable to a network, the control method comprising:

• sending data to a receiver apparatus via the network;
• receiving acknowledgement data including an acknowledgement and information on a receive window size from the receiver apparatus via the network;
• controlling a bandwidth for data to be sent from the transmission apparatus;
• restricting the controlled bandwidth in such a manner that a data size of data for which no acknowledgement is received from the receiver apparatus among data which is sent is equal to or smaller than an upper limit size determined from the receive window size;
• and
• switching on the restricting the bandwidth in a case where the data size is smaller than the receive window size and switching off the restricting the bandwidth in a case where the data size is equal to or larger than the receive window size.

A non-transitory computer-readable storage medium storing commands for controlling a transmission apparatus including an interface, a processor, and a primary storage, the commands being to be executed by the processor to make the processor perform the following processing of:

• sending data to a receiver apparatus from the interface;
• receiving acknowledgement data including an acknowledgement and information on a receive window size from the receiver apparatus via the interface;
• controlling a bandwidth for data to be sent from the interface;
• restricting the controlled bandwidth in such a manner that a data size of data for which no acknowledgement is received from the receiver apparatus among data which is sent is equal to or smaller than an upper limit size determined from the receive window size;
• and
• switching on the restricting the bandwidth in a case where the data size is smaller than the receive window size and switching off the restricting the bandwidth in a case where the data size is equal to or larger than the receive window size.