Communication system and communication method

A communication method, comprising:

• receiving a packet data transmitted using a first protocol not including a retransmission function;
• detecting a predetermined bit pattern in said packet data received;
• determining said packet data in which said bit pattern is detected is a target of protocol conversion;
• converting said protocol of said determined packet data into a second protocol including a retransmission function;
• adding a conversion tag indicating execution of said protocol conversion to said converted packet data and transmitting said converted packet data including said conversion tag;
• receiving said packet data transmitted using said second protocol;
• detecting said conversion tag in said packet data transmitted using said second protocol;
• and
• converting said protocol of said packet data in which said conversion tag is detected into a third protocol.

A transmission method, comprising:

• receiving a packet data transmitted using a first protocol not including a retransmission function;
• detecting a predetermined bit pattern in said packet data received;
• determining said packet data in which said bit pattern is detected is a target of protocol conversion;
• converting said protocol of said determined packet data into a second protocol including a retransmission function;
• and
• adding a conversion tag indicating execution of said protocol conversion to said converted packet data and transmitting said converted packet data including said conversion tag.

A receiving method, comprising:

• receiving packet data transmitted using a first protocol including a retransmission function;
• detecting a conversion tag in said packet data transmitted using said first protocol;
• and
• converting said protocol of said packet data in which said conversion tag is detected into a second protocol not including a retransmission function.

A communication system, comprising:

• a transmitting means for transmitting a packet data, comprising:
• a first detection means for receiving a packet data transmitted using a first protocol not including a retransmission function, detecting a predetermined bit pattern in said received packet data, and determining said packet data in which said bit pattern is detected is a target of protocol conversion;
• and
• a first converting means for converting said first protocol of said determined packet data into a second protocol including a retransmission function, adding a conversion tag indicating execution of said protocol conversion to said converted packet data and transmitting said converted packet data including said conversion tag;
• and
• a receiving means for receiving a packet data, comprising:
• a second detection means for receiving said packet data which is transmitted using said second protocol and detecting said conversion tag in said packet data which is transmitted using said second protocol;
• and
• a second converting means for converting said protocol of said packet data in which said conversion tag is detected into a third protocol.