Mobile station, base station, communication system, and communication method

A base station which receives a transmission request for permission to transmit packet data from a mobile station, notifies transmission schedule information which said base station determines in response to said transmission request to said mobile station, and receives said packet data which is transmitted thereto by said mobile station according to said transmission schedule information, characterized in that said base station comprises:

• a receiving unit for receiving said transmission request from said mobile station, and for receiving packet data which corresponds to said transmission request and which is transmitted by said mobile station;
• a scheduling unit, responsive to a transmission request for permission to transmit new packet data which said receiving unit receives, for, when a result of judgment of reception of the packet data which is transmitted according to said transmission schedule information shows a failure of reception, assigning a transmission schedule to retransmission of said packet data which said receiving unit has failed to receive on a priority basis, and for creating information about said assigned transmission schedule;
• and
• a transmitting unit for transmitting both the transmission schedule information created by said scheduling unit and said result of judgment of reception of the packet data to said mobile station.

A CDMA (Code Division Multiple Access) communications system in which a mobile station sends a transmission request for permission to transmit packet data to a base station and transmits said packet data to said base station according to transmission schedule information about a transmission schedule which said base station determines in response to said transmission request, characterized in that

• said mobile station comprises:
• a transmitting unit for transmitting said transmission request for permission to transmit packet data to said base station, and for transmitting said packet data to said base station;
• a receiving unit for receiving said transmission schedule information from said base station, and for receiving a result of judgment of reception of said packet data which is transmitted to said base station by said transmitting unit;
• and a control unit for controlling said transmitting unit so that said transmitting unit transmits a transmission request for permission to transmit new packet data before said receiving unit completes the reception of said reception judgment result,
• and said base station comprises:
• a receiving unit for receiving said transmission request from said mobile station, and for receiving packet data which corresponds to said transmission request and which is transmitted by said mobile station;
• a scheduling unit, responsive to a transmission request for permission to transmit new packet data which said receiving unit receives, for, when a result of judgment of reception of the packet data which is transmitted according to said transmission schedule information shows a failure of reception, assigning a transmission schedule to retransmission of said packet data which said receiving unit has failed to receive on a priority basis, and for creating information about said assigned transmission schedule;
• and
• a transmitting unit for transmitting both the transmission schedule information created by said scheduling unit and said result of judgment of reception of the packet data to said mobile station.

A communications method for use in a CDMA (Code Division Multiple Access) terminal which sends a transmission request for permission to transmit packet data to a base station and transmits said packet data to said base station according to transmission schedule information about a transmission schedule which said base station determines in response to said transmission request, characterized in that said communications method comprises:

• a step of transmitting a transmission request for permission to transmit next packet data to said base station before receiving a result of judgment of reception of packet data which is transmitted to said base station last time from said base station;
• a step of receiving transmission schedule information which corresponds to said transmission request from said base station;
• and
• a step of transmitting the next packet data to said base station according to said transmission schedule information.

A communications method for use in a CDMA (Code Division Multiple Access) base station which receives a transmission request for permission to transmit packet data from a terminal, notifies transmission schedule information which said base station determines in response to said transmission request to said terminal, and receives said packet data which is transmitted thereto by said terminal according to said transmission schedule information, characterized in that said communications method comprises:

• a step of receiving said packet data from said terminal;
• a step of receiving said transmission request from said terminal;
• a step of, when a result of judgment of reception of said packet data shows a failure of reception, assigning a transmission schedule to retransmission of said packet data which said receiving step has failed to receive by making the retransmission a higher priority than a request for permission to transmit next packet data;
• and
• a step of transmitting the transmission schedule information which corresponds to the retransmission of said packet data to said terminal.