Communication system, communication terminal, server and data transfer control program

A communication terminal for transmitting and receiving variable-length communication frames as a data string to and from a server, comprising

• means for transferring, to said server, a control frame which is indicative of control information necessary for communication with said server and whose size is smaller than the size of said communication frame so as to be included in a preamble portion between respective said communication frames of said data string.

The communication terminal as set forth in 20, which

• notifies traffic information to said server by using said control frame, and
• receives said control frame which designates said transmission allowed period assigned based on said traffic information from said server.

A server for transmitting and receiving a variable-length communication frame as a data string to and from a communication terminal, comprising

• means for transferring, to said communication terminal, a control frame which is indicative of control information necessary for communication with said communication terminal and whose size is smaller than the size of said communication frame so as to be included in a preamble portion between respective said communication frames of said data string.

A frame transmission control program for controlling frame transmission of a communication terminal which transmits and receives variable-length communication frames as a data string to and from a server by controlling a computer, comprising the functions of:

• transferring, to said server, a control frame which is indicative of control information necessary for communication with said server and whose size is smaller than the size of said communication frame so as to be included in a preamble portion between respective said communication frames,
• when said communication frame to be transmitted fails to exist, transferring said control frame as an independent frame to said server, and
• receiving said control frame transferred from said server.

A frame transmission control program for controlling frame transmission of a server which transmits and receives variable-length communication frames as a data string to and from a communication terminal by controlling a computer, comprising the functions of:

• transferring, to said communication terminal, a control frame which is indicative of control information necessary for communication with said communication terminal and whose size is smaller than the size of said communication frame so as to be included in a preamble portion between respective said communication frames,
• when said communication frame to be transmitted fails to exist, transferring said control frame as an independent frame to said communication terminal, and
• receiving said control frame transferred from said communication terminal.