Communication system, transmission apparatus, reception apparatus, communication apparatus, communication method, and program
A communication system including a transmission apparatus and a reception apparatus, the transmission apparatus including: a buffer configured to hold first data to transmit; transmission means configured to transmit the first data to the reception apparatus; reception means configured to receive second data that the reception apparatus returns; comparison means configured to compare the second data with the first data held by the buffer; and control means configured, when a result of the comparison by the comparison means is unmatch, to instruct the transmission means to retransmit the first data.
1. A communication system including a transmission apparatus and a reception apparatus,
the transmission apparatus comprising:
a buffer configured to hold first data to transmit;
a transmitter configured to transmit the first data to the reception apparatus;
a receiver configured to receive second data that the reception apparatus returns; and
processing circuitry configured to
perform a comparison to compare the second data with the first data held by the buffer; and
when a result of the comparison is unmatch, instruct the transmitter to retransmit the first data,
wherein the processing circuitry instructs the transmitter to retransmit the first data when time-out occurs without receiving the second data within a predetermined period.
2. The communication system as claimed in claim 1 , wherein the transmission apparatus transmits next first data without waiting return of the second data.
3. The communication system as claimed in claim 2 , wherein the number of pieces of the first data to transmit without waiting the return of the second data is determined by a predetermined setting.
4. The communication system as claimed in claim 1 , wherein the processing circuitry deletes the first data from the buffer when a result of the comparison is match.
5. The communication system as claimed in claim 1 , wherein, after retransmitting first data due to time-out, the communication system waits by performing backoff when time-out also occurs for the first data, and when further time-out occurs, the communication system checks a state of the reception apparatus by another communication method.
6. The communication system as claimed in claim 1 , wherein the first data and the second data are transferred by using datagram communication.
7. A transmission apparatus comprising:
a buffer configured to hold first data to transmit;
a transmitter configured to transmit the first data to a reception apparatus;
a receiver configured to receive second data that the reception apparatus returns; and
processing circuitry configured to
perform a comparison to compare the second data with the first data held by the buffer; and
when a result of the comparison is unmatch, instruct the transmitter to retransmit the first data,
wherein the processing circuitry instructs the transmitter to retransmit the first data when time-out occurs without receiving the second data within a predetermined period.
8. A computer-readable recording medium storing a program for causing a computer to function as the transmission apparatus as claimed in claim 7 .
9. A communication method performed by a transmission apparatus, comprising:
a step of transmitting, via a transmitter, first data to a reception apparatus;
a step of receiving, via a receiver, second data that the reception apparatus returns;
a step of comparing, by processing circuitry, the second data with the first data; and
a step of, when a result of the step of comparing, by the processing circuitry, is unmatch, retransmitting the first data,
wherein the method further includes instructing, by the processing circuitry, the transmitter to retransmit the first data when time-out occurs without receiving the second data within a predetermined period.