COMMUNICATION DEVICE, COMMUNICATION METHOD, AND COMMUNICATION SYSTEM

• US 20200137625A1
• Filed: 12/23/2019
• Published: 04/30/2020
• Est. Priority Date: 07/04/2017
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Ohta, Yoshiaki, KAWASAKI, YOSHIHIRO, Ode, Takayoshi, AIKAWA, SHINICHIRO
• Granted Patent: US 11,546,797 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 1/1835 Buffer management
• CPC Class Codes: H04L 1/1838 for semi-reliable protocols, e.g. for less sensitive applications such as streaming video buffer level management for video bitstream receiver H04N21/44004
• CPC Class Codes: H04L 43/0888 Throughput
• CPC Class Codes: H04L 43/16 Threshold monitoring
• CPC Class Codes: H04L 47/323 Discarding or blocking control packets, e.g. ACK packets
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 80/06 Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless transmission control protocol/Internet protocol [TCP/IP] or user datagram protocol [UDP] H04L69/16

Abstract

A first communication device in a communication systems including the first communication device and the second communication device that performs wireless connection with the first communication device and relays communication with the first communication device, the first communication device includes a receiver configured to receive packets from the second communication device, and a transmitter configured to store reception confirmation packets corresponding to the packets in a buffer, perform transmission at least a portion of the reception confirmation packets stored in the buffer, and discard reception confirmation packets not to be transmitted in the transmission according to a discard ratio.

Claims

1. A first communication device in a communication systems including the first communication device and the second communication device that performs wireless connection with the first communication device and relays communication with the first communication device, the first communication device comprising:

a receiver configured to receive packets from the second communication device; and

a transmitter configured to;

store reception confirmation packets corresponding to the packets in a buffer,

perform transmission at least a portion of the reception confirmation packets stored in the buffer, and

discard reception confirmation packets not to be transmitted in the transmission according to a discard ratio.

2. The first communication device according to claim 1, further comprising:

a determiner configured to determine the discard ratio used in the communication according to a state of the wireless connection.

3. The first communication device according to claim 2, wherein

the determiner is configured to determine the discard ratio used in the connection according to a throughput in the wireless connection and the number of transmissions of the reception confirmation packets from the first communication device.

4. The first communication device according to claim 3, wherein

the determiner is configured to determine a discard ratio that is a minimum number of transmissions among discard ratios with the throughput equal to or higher than a first threshold as the discard ratio used in the communication.

5. The first communication device according to claim 3, wherein

the transmitter is configured to perform a plurality of types of transmission number determination processing that determine the number of transmissions of the reception confirmation packets in the processing of transmitting at least a part of the reception confirmation packets, and

the determiner is configured to determine the transmission number determination processing used in the communication among the plurality of types of transmission number determination processing.

6. The first communication device according to claim 5, wherein

the determiner is configured to

select a discard ratio with a minimum number of transmissions from among discard ratios with the throughput equal to or higher than a first threshold for each of the plurality of types of transmission number determination processing, and

determine the transmission number determination processing that is a minimum number of transmissions at the selected discard ratio as the transmission number determination processing used in the communication.

7. The first communication device according to claim 2, wherein

the determiner is configured to determine the discard ratio according to a requested amount of resources requested to the second communication device by the first communication device and an allocated amount of resources allocated to the first communication device by the second communication device.

8. The first communication device according to claim 7, wherein

the determiner is configured to determine a discard ratio at which a difference between the requested amount of resources and the allocated amount of resources is within a second threshold as the discard ratio used in the communication.

9. The first communication device according to claim 7, wherein

the determiner is configured to determine the discard ratio according to the number of transmissions of the reception confirmation packets.

10. The first communication device according to claim 9, wherein

the determiner is configured to determine a fourth discard ratio that minimums the number of transmissions among fourth discard ratios as the discard ration used in the communication, the fourth discard ratios being between a second discard ratio and a third discard ratio, the second discard ratio being higher by a predetermined number than a first discard ratio at which a difference between the requested amount of resources and the allocated amount of resources is within a second threshold, the third discard ratio being lower than the first discard ratio by a predetermined number.

11. The first communication device according to claim 5, wherein

the plurality of types of transmission number determination processing includes first transmission number determination processing that determines the number of transmissions of the reception confirmation packets according to an allocated amount of resources allocated to the first communication device by the second communication device.

12. The first communication device according to claim 5, wherein

the plurality of types of transmission number determination processing includes second transmission number determination processing that determines the number of response confirmation packets stored in the buffer by the receiver, as the number of transmissions of the reception confirmation packets.

13. The first communication device according to claim 5, wherein

the plurality of types of transmission number determination processing includes third transmission number determination processing that performs both of first transmission number determination processing that determines the number of transmissions of the reception confirmation packets according to an allocated amount of resources allocated to the first communication device by the second communication device, and second transmission number determination processing that determines the number of response confirmation packets stored in the buffer by the receiver, as the number of transmissions of the reception confirmation packets.

14. The first communication device according to claim 2, wherein

the transmitter is configured to transmit, to the second communication device, a reception confirmation packet other than the reception confirmation packets to be discarded, the reception confirmation packet being one of the reception confirmation packets not to be transmitted in the transmission.

15. The first communication device according to claim 1, wherein

the discard ratio is defined according to an accumulation threshold of the buffer.

16. A communication system comprising a first communication device and a second communication device that performs wireless connection with the first communication device and relays communication with the first communication device, wherein

the first communication device includes:

a receiver configured to receive packets from the second communication device, and

a transmitter configured to;

store reception confirmation packets corresponding to the packets in a buffer,

perform transmission at least a portion of the reception confirmation packets stored in the buffer, and

discard reception confirmation packets not to be transmitted in the transmission according to a discard ratio.

17. A communication method for a first communication device in a communication system including the first communication device and a second communication device that performs wireless connection with the first communication device and relays communication with the first communication device, the communication method comprising:

receiving packets from the second communication device, and

storing reception confirmation packets corresponding to the packets in a buffer,

performing transmission at least a portion of the reception confirmation packets stored in the buffer, and

discarding reception confirmation packets not to be transmitted in the transmission according to a discard ratio.