Base station and communication method

A base station including:

• a reception section that receives data signals which have been transmitted from a plurality of communication terminals through a predetermined frequency channel;
• a measurement section that measures a received signal power of the received data signal for each of the communication terminals;
• a determination section that determines, for each of the transmission terminals, whether or not the received data signal has been demodulated without error;
• and
• a control section that assigns retransmission intervals to communication terminals the data signals of which are determined as not having been demodulated without error by the determination section, in such a manner that a shorter transmission interval is assigned preferentially to a communication terminal having a larger received signal power detected by the measurement section, and transmits a retransmission request signal that requests this communication terminal to retransmit the data signal using the assigned retransmission interval.

A communication method including:

• an estimation step of estimating a transmission condition of each frequency channel among a plurality of frequency channels to be used for communication;
• a reception step of receiving a data signal which has been transmitted from each of a plurality of communication terminals through any frequency channel among the plurality of frequency channels;
• a measurement step of measuring a received signal power of the received data signal for each of the frequency channels;
• a determination step of determining, for each of the frequency channels, whether or not the received data signal has been demodulated without error;
• and
• a control step of assigning frequency channels estimated as being in good transmission condition in the estimation step, to communication terminals the data signals of which are determined as not having been demodulated without error in the determination step, in such a manner that a frequency channel being in a better transmission condition is assigned preferentially to a communication terminal having a larger received signal power detected in the measurement step, and transmitting retransmission request signals that request the communication terminals to retransmit the data signals using the assigned frequency channels.

A communication method including:

• a reception step of receiving data signals which have been transmitted from a plurality of communication terminals through a predetermined frequency channel;
• a measurement step of measuring a received signal power of the received data signal for each of the communication terminals;
• a determination step of determining, for each of the transmission terminals, whether or not the received data signal has been demodulated without error;
• and
• a control step of assigning retransmission intervals to communication terminals the data signals of which are determined as not having been demodulated without error in the determination step, in such a manner that a shorter transmission interval is assigned preferentially to a communication terminal having a larger received signal power detected in the measurement step, and transmitting a retransmission request signal that requests this communication terminal to retransmit the data signal using the assigned retransmission interval.

A communication program that is stored in a computer-readable recording medium, and is executable by a communication device operating as a base station in a network system, the communication program including:

• an estimation step of estimating a transmission condition of each frequency channel among a plurality of frequency channels to be used for communication;
• a reception step of receiving a data signal which has been transmitted from each of a plurality of communication terminals through any frequency channel among the plurality of frequency channels;
• a measurement step of measuring a received signal power of the received data signal for each of the frequency channels;
• a determination step of determining, for each of the frequency channels, whether or not the received data signal has been demodulated without error;
• and
• a control step of assigning frequency channels estimated as being in good transmission condition in the estimation step, to communication terminals the data signals of which are determined as not having been demodulated without error in the determination step, in such a manner that a frequency channel being in a better transmission condition is assigned preferentially to a communication terminal having a larger received signal power detected in the measurement step, and transmitting retransmission request signals that request the communication terminals to retransmit the data signals using the assigned frequency channels.

A communication program that is stored in a computer-readable recording medium, and is executable by a communication device operating as a base station in a network system, the communication program including:

• a reception step of receiving data signals which have been transmitted from a plurality of communication terminals through a predetermined frequency channel;
• a measurement step of measuring a received signal power of the received data signal for each of the communication terminals;
• a determination step of determining, for each of the transmission terminals, whether or not the received data signal has been demodulated without error;
• and
• a control step of assigning retransmission intervals to communication terminals the data signals of which are determined as not having been demodulated without error in the determination step, in such a manner that a shorter transmission interval is assigned preferentially to a communication terminal having a larger received signal power detected in the measurement step, and transmitting a retransmission request signal that requests this communication terminal to retransmit the data signal using the assigned retransmission interval.

An integrated circuit including:

• an estimation section that estimates a transmission condition of each frequency channel among a plurality of frequency channels to be used for communication;
• a reception section that receives a data signal which has been transmitted from each of a plurality of communication terminals through any frequency channel among the plurality of frequency channels;
• a measurement section that measures a received signal power of the received data signal for each of the frequency channels;
• a determination section that determines, for each of the frequency channels, whether or not the received data signal has been demodulated without error;
• and
• a control section that assigns frequency channels estimated as being in good transmission condition by the estimation section, to communication terminals the data signals of which are determined as not having been demodulated without error by the determination section, in such a manner that a frequency channel being in a better transmission condition is assigned preferentially to a communication terminal having a larger received signal power detected by the measurement section, and transmits retransmission request signals that request the communication terminals to retransmit the data signals using the assigned frequency channels.

An integrated circuit including:

• a reception section that receives data signals which have been transmitted from a plurality of communication terminals through a predetermined frequency channel;
• a measurement section that measures a received signal power of the received data signal for each of the communication terminals;
• a determination section that determines, for each of the transmission terminals, whether or not the received data signal has been demodulated without error;
• and
• a control section that assigns retransmission intervals to communication terminals the data signals of which are determined as not having been demodulated without error by the determination section, in such a manner that a shorter transmission interval is assigned preferentially to a communication terminal having a larger received signal power detected by the measurement section, and transmits a retransmission request signal that requests this communication terminal to retransmit the data signal using the assigned retransmission interval.

A network system comprising a plurality of communication terminals and a base station that communicates with the plurality of communication terminals, the base station including:

• an estimation section that estimates a transmission condition of each frequency channel among a plurality of frequency channels to be used for communication;
• a reception section that receives a data signal which has been transmitted from each of a plurality of communication terminals through any frequency channel among the plurality of frequency channels;
• a measurement section that measures a received signal power of the received data signal for each of the frequency channels;
• a determination section that determines, for each of the frequency channels, whether or not the received data signal has been demodulated without error;
• and
• a control section that assigns frequency channels estimated as being in good transmission condition by the estimation section, to communication terminals the data signals of which are determined as not having been demodulated without error by the determination section, in such a manner that a frequency channel being in a better transmission condition is assigned preferentially to a communication terminal having a larger received signal power detected by the measurement section, and transmits retransmission request signals that request the communication terminals to retransmit the data signals using the assigned frequency channels.

A network system comprising a plurality of communication terminals and a base station that communicates with the plurality of communication terminals, the base station including:

• a reception section that receives data signals which have been transmitted from a plurality of communication terminals through a predetermined frequency channel;
• a measurement section that measures a received signal power of the received data signal for each of the communication terminals;
• a determination section that determines, for each of the transmission terminals, whether or not the received data signal has been demodulated without error;
• and
• a control section that assigns retransmission intervals to communication terminals the data signals of which are determined as not having been demodulated without error by the determination section, in such a manner that a shorter transmission interval is assigned preferentially to a communication terminal having a larger received signal power detected by the measurement section, and transmits a retransmission request signal that requests this communication terminal to retransmit the data signal using the assigned retransmission interval.