Protocol information processing system and method information processing device and method recording medium and program

A method for transmitting data packets from a server to a receiver over a network using a protocol for packetized data transmission, the method comprising:

• by the server:
• receiving a report from the receiver;
• acquiring a sequence number from the receiver report;
• calculating a loss rate of packets transmitted from the receiver to the server based on the sequence number;
• setting a transmission error correction method based on the packet loss rate, wherein:
• if the packet loss rate is greater than a first reference value, the server sets forward error correction (FEC), whereby the receiver corrects transmission errors, as the transmission error correction method, and
• if the packet loss rate is less than the first reference value and greater than a second reference value, the server sets automatic repeat request (ARQ), whereby the receiver requests the server to transmit lost data packets, as the transmission error correction method;
• including the packet loss rate in a sender report, and
• transmitting the sender report to the receiver;
• and
• by the receiver:
• receiving the data packets from the server,
• acquiring information identifying lost data packets from the data packets, and
• transmitting to the server a request to transmit the lost data packets, a method of transmitting the request being based upon the packet loss rate in the sender report.

A server for transmitting data packets to a receiver over a network using a protocol for packetized data transmission, the server comprising:

• means for acquiring a sequence number from a report transmitted from the receiver to the server;
• means for calculating a loss rate of packets transmitted from the receiver to the server based on the sequence number;
• means for setting a transmission error correction method based on the packet loss rate, wherein:
• if the packet loss rate is greater than a first reference value, the server sets forward error correction (FEC), whereby the receiver corrects transmission errors, as the transmission error correction method, and
• if the packet loss rate is less than the first reference value and greater than a second reference value, the server sets automatic repeat request (ARQ), whereby the receiver requests the server to transmit lost data packets, as the transmission error correction method;
• means for transmitting a sender report containing the packet loss rate to the receiver;
• and
• means for transmitting lost data packets in response to a request from the receiver, a format of the request being based upon the packet loss rate contained in the sender report.

A method of a server for transmitting data packets to a receiver over a network using a protocol for packetized data transmission, the method comprising:

• acquiring a sequence number from a report transmitted from the receiver;
• calculating a loss rate of packets transmitted from the receiver to the server based on the sequence number;
• setting a transmission error correction method based on the packet loss rate, wherein:
• if the packet loss rate is greater than a first reference value, the server sets forward error correction (FEC), whereby the receiver corrects transmission errors, as the transmission error correction method, and
• if the packet loss rate is less than the first reference value and greater than a second reference value, the server sets automatic repeat reguest (ARQ), whereby the receiver requests the server to transmit lost data packets, as the transmission error correction method;
• transmitting a sender report containing the packet loss rate to the receiver;
• and
• transmitting lost data packets in response to a request from the receiver, a format of the request being based upon the packet loss rate contained in the sender report.

A computer-readable storage medium storing a computer program which, when executed by a server, causes the server to perform a method for transmitting data packets to a receiver over a network using a protocol for packetized data transmission, the method comprising:

• acquiring a sequence number from a report transmitted from the receiver;
• calculating a loss rate of packets transmitted from the receiver to the server based on the sequence number;
• setting a transmission error correction method based on the packet loss rate, wherein:
• if the packet loss rate is greater than a first reference value, the server sets forward error correction (FEC), whereby the receiver corrects transmission errors, as the transmission error correction method, and
• if the packet loss rate is less than the first reference value and greater than a second reference value, the server sets automatic repeat request (ARQ), whereby the receiver requests the server to transmit lost data packets, as the transmission error correction method;
• transmitting a sender report containing the packet loss rate to the receiver;
• and
• transmitting lost data packets in response to a request from the receiver, a format of the request being based upon the packet loss rate contained in the sender report.

A receiver for receiving data packets from a server over a network using a protocol for packetized data transmission, the receiver comprising:

• means for receiving the data packets from the server;
• means for acquiring information about lost data packets from the received data packets;
• means for transmitting a request to the server to transmit the lost data packets, a method of transmitting the request being based upon a loss rate of packets transmitted from the receiver to the server contained in a sender report received from the server, the means for transmitting including:
• means for, if the packet loss rate falls within a first range, transmitting to the server multiple request packets each identifying the same lost data packet;
• means for, if the packet loss rate falls within a second range, transmitting to the server a request packet identifying multiple lost data packets;
• and
• means for, if the packet loss rate falls within a third range, transmitting to the server multiple request packets each identifying a different lost data packet;
• means for communicating in accordance with a transmission error correction method set by the server, wherein:
• if the packet loss rate is greater than a first reference value, forward error correction (FEC), whereby the receiver corrects transmission errors, is set as the transmission error correction method;
• and
• if the packet loss rate is less than the first reference value and greater than a second reference value, automatic repeat request (ARQ), whereby the receiver requests the server to transmit lost data packets, is set as the transmission error correction method.

A method of a receiver for receiving data packets from a server over a network using a protocol for packetized data transmission, the method comprising:

• receiving the data packets from the server;
• acquiring information about lost data packets from the received data packets;
• transmitting a request to the server to transmit the lost data packets, a method of transmitting the request being based upon a loss rate of packets transmitted to the server contained in a sender report received from the server and including:
• if the packet loss rate falls within a first range, transmitting to the server multiple request packets each identifying the same lost data packet;
• if the packet loss rate falls within a second range, transmitting to the server a request packet identifying multiple lost data packets;
• and
• if the packet loss rate falls within a third range, transmitting to the server multiple request packets each identifying a different lost data packet;
• and
• communicating in accordance with a transmission error correction method set by the server, wherein:
• if the packet loss rate is greater than a first reference value, forward error correction (FEC), whereby the receiver corrects transmission errors, is set as the transmission error correction method;
• and
• if the packet loss rate is less than the first reference value and greater than a second reference value, automatic repeat request (ARQ), whereby the receiver requests the server to transmit lost data packets, is set as the transmission error correction method.

A computer-readable storage medium storing a computer program which, when executed by a receiver, causes the receiver to perform a method for receiving data packets from a server over a network using a protocol for packetized data transmission, the method comprising:

• receiving the data packets from the server;
• acquiring information about lost data packets from the received data packets;
• transmitting to the server a request to transmit the lost data packets, a method of transmitting the request being based upon a loss rate of packets transmitted to the server contained in a sender report received from the server and including:
• if the packet loss rate falls within a first range, transmitting to the server multiple request packets each identifying the same lost data packet;
• if the packet loss rate falls within a second range, transmitting to the server a request packet identifying multiple lost data packets;
• and
• if the packet loss rate falls within a third range, transmitting to the server multiple request packets each identifying a different lost data packet;
• and
• communicating in accordance with a transmission error correction method set by the server, wherein:
• if the packet loss rate is greater than a first reference value, forward error correction (FEC), whereby the receiver corrects transmission errors, is set as the transmission error correction method;
• and
• if the packet loss rate is less than the first reference value and greater than a second reference value, automatic repeat request (ARQ), whereby the receiver requests the server to transmit lost data packets, is set as the transmission error correction method.