COMMUNICATION SYSTEM, TRANSMISSION APPARATUS, RECEPTION APPARATUS, COMMUNICATION APPARATUS, COMMUNICATION METHOD, AND PROGRAM

• US 20170180816A1
• Filed: 04/03/2015
• Published: 06/22/2017
• Est. Priority Date: 04/04/2014
• Status: Active Grant

• Current Assignee: NTT Communications Corporation (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Communications Corporation (Nippon Telegraph and Telephone Corporation)
• Inventors: OGIHARA, Toshihiko
• Granted Patent: US 10,178,440 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/14 in which the signals are sent back to the transmitter to be checked ; echo systems
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06
• CPC Class Codes: H04N 19/15 by monitoring actual compressed data size at the memory before deciding storage at the transmission buffer
• CPC Class Codes: H04N 21/23406 involving management of server-side video buffer
• CPC Class Codes: H04N 21/44004 involving video buffer management, e.g. video decoder buffer or video display buffer
• CPC Class Codes: H04N 21/6375 for requesting retransmission , e.g. of data packets lost or corrupted during transmission from serverARQ protocols H04L1/18; implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP] H04L69/16

Abstract

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.

Claims

8. A transmission apparatus comprising:

a buffer configured to hold first data to transmit;

a transmission unit configured to transmit the first data to a reception apparatus;

a reception unit configured to receive second data that the reception apparatus returns;

a comparison unit configured to compare the second data with the first data held by the buffer; and

a control unit configured, when a result of the comparison by the comparison unit is unmatch, to instruct the transmission unit to retransmit the first data.

9. A computer-readable recording medium storing a program for causing a computer to function as the transmission apparatus as claimed in claim 8.

10. A reception apparatus comprising:

a reception unit configured to receive first data from a transmission apparatus; and

a transmission unit configured to return the received first data to the transmission apparatus as second data to cause the transmission apparatus to compare the second data with the first data.

11-1. A non-transitory computer-readable recording medium storing a program causing a computer to function as the communication apparatus as claimed in claim 18.

12. A communication method performed by a transmission apparatus and a reception apparatus, comprising:

a step of transmitting first data to the reception apparatus;

a step of receiving second data that the reception apparatus returns;

a step of comparing the second data with the first data; and

a step of, when a result of the step of comparing is unmatch, retransmitting the first data,

which are performed by the transmission apparatus.

13. A communication system comprising a first communication apparatus and a second communication apparatus, wherein

the first communication apparatus transmits first data to the second communication apparatus;

the second communication apparatus transmits, to the first communication apparatus, third data obtained by superimposing second data on the first data received from the first communication apparatus; and

the first communication apparatus obtains the second data from the third data received from the second communication apparatus by using the first data that is held by the first communication apparatus.

14. The communication system as claimed in claim 13, wherein the second communication apparatus obtains the third data by calculating an exclusive OR between the first data and the second data, and

the first communication apparatus obtains the second data by calculating an exclusive OR between the first data and the third data.

15. The communication system as claimed in claim 14, wherein, when data obtained by calculating an exclusive OR between the third data received from the second communication apparatus and the calculated second data is the same as the first data held by the first communication apparatus, the first communication apparatus estimates that the calculated second data is second data transmitted from the second communication apparatus.

16. The communication system as claimed in claim 13, wherein, it is assumed that, at the start of communication between the first communication apparatus and the second communication apparatus, data of a value of 0 has already been transmitted from the second communication apparatus to the first communication apparatus without an error, and wherein

at the end of communication between the first communication apparatus and the second communication apparatus, the first communication apparatus transmits, to the second communication apparatus, data obtained by exclusive OR between data of a value of 0 and data that is estimated to be transmitted from the second communication apparatus right before.

17. A communication method in a communication system comprising a first communication apparatus and a second communication apparatus, comprising:

a step in which the first communication apparatus transmits first data to the second communication apparatus;

a step in which the second communication apparatus transmits, to the first communication apparatus, third data obtained by superimposing second data on the first data received from the first communication apparatus; and

a step in which the first communication apparatus obtains the second data from the third data received from the second communication apparatus by using the first data that is held by the first communication apparatus.

18. A communication apparatus configured to perform communication with a partner communication apparatus that becomes a communication partner, comprising:

a unit configured to transmit first data to the partner communication apparatus, and receive, from the partner communication apparatus, third data obtained by superimposing second data on the first data;

a storage unit configured to hold the first data transmitted to the partner communication apparatus; and

a data obtaining unit configured to obtain the second data from the third data received from the partner communication apparatus by using the first data that is held in the storage unit.

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 transmission unit configured to transmit the first data to the reception apparatus;

a reception unit configured to receive second data that the reception apparatus returns;

a comparison unit configured to compare the second data with the first data held by the buffer; and

a control unit configured, when a result of the comparison by the comparison unit is unmatch, to instruct the transmission unit to retransmit the first data.

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 setting.

4. The communication system as claimed in claim 1, wherein the control unit deletes the first data from the buffer when a result of the comparison by the comparison unit is match.

5. The communication system as claimed in claim 1, wherein the control unit instructs the transmission unit to retransmit the first data when time-out occurs without receiving the second data within a predetermined period.

6. The communication system as claimed in claim 5, 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.

7. The communication system as claimed in claim 1, wherein the first data and the second data are transferred by using datagram communication.

11. A non-transitory computer-readable recording medium storing a program for causing a computer to function as the reception apparatus as claimed in claim 10.

19. The communication apparatus as claimed in claim 18, wherein, in the partner communication apparatus, the third data is obtained by calculating an exclusive OR between the first data and the second data, and

the data obtaining unit obtains the second data by calculating an exclusive OR between the first data and the third data.

20. The communication apparatus as claimed in claim 19, wherein, when data obtained by calculating an exclusive OR between the third data received from the partner communication apparatus and the calculated second data is the same as the first data held in the storage unit, the data obtaining unit estimates that the calculated second data is second data transmitted from the second communication apparatus.