Packet transmission system and packet transmission method

(AMENDED) A transmission side apparatus in a packet transmission system that employs hybrid ARQ, comprising:

• an error correction section that performs error correction processing upon data;
• a puncturing section that punctures retransmission data that has been subjected to said error correction processing and extracts a specific bit;
• a data selection section that selects new transmission data that has been subjected to said error correction processing or the punctured retransmission data as requested by a reception side apparatus;
• a rate setting section that upon transmitting new data or upon retransmission data sets a transmission rate based on a reception quality in said reception side apparatus;
• and,
• a modulation section that modulates the data selected in said data selection section to the rate set in said rate setting section.

(AMENDED) A base station apparatus that is for use in a packet transmission system employing ARQ and that comprises a transmission side apparatus, said transmission side apparatus comprising:

• a data selection section that selects new transmission data and retransmission data as requested by a reception side apparatus;
• a rate setting section that upon transmitting new data or upon retransmitting data sets a transmission rate based on a reception quality in said reception side apparatus;
• and,
• a modulation section that modulates the data selected in said data selection section to the transmission rate set in said rate setting section.

(AMENDED) A communication terminal apparatus that is for use in a packet transmission system employing hybrid ARQ and that comprises a transmission side apparatus, said transmission side apparatus comprising:

• a data selection section that selects new transmission data or retransmission data as requested by a reception side apparatus;
• a rate setting section that upon new data transmission or upon data retransmission sets a transmission rate based on a reception quality in said reception side apparatus;
• and,
• a modulation section that modulates the data selected in said data selection section to the rate set in said rate setting section.