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Communication device

A communication device, network technology, applied in the direction of digital transmission system, electrical components, transmission system, etc., can solve problems such as bandwidth limitation, and achieve the effect of preventing overflow

Inactive Publication Date: 2013-05-01
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usable bandwidth of these lines is limited by the contracted frequency band

Method used

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Examples

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Embodiment Construction

[0050] Typical embodiments for carrying out the present invention are as follows.

[0051] First, use Figure 13 with Figure 14 , the problems of the conventional relay devices 1310 and 1320 will be described.

[0052] Figure 13 In , a sequence diagram is shown when the conventional devices 1310 and 1320 relay the communication between the terminal 111 and the terminal 121 . Figure 14 In , the transition of the LAN frequency band 1401 between the terminal 111 and the device 1310 and the WAN frequency band 1402 between the device 1310 and the device 1320 is shown.

[0053]In this example, the device 1310 includes a receive buffer rbuf capable of storing 2 packets on the LAN side, and a send buffer sbuf capable of storing 3 packets on the WAN side ( 1301 ).

[0054] When the device 1310 receives the first data packet 1313 from the terminal 111 , it stores one piece of data described in the packet in the reception buffer rbuf on the LAN side of the device 1310 ( 1302 ). A...

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Abstract

In a relay device for relaying a LAN-side and a WAN-side TCP communication (two TCP communications), buffer overflow in a LAN-side receiving buffer and a WAN-side transmission buffer of the relay device is prevented even if the WAN-side line bandwidth is smaller than the LAN-side line bandwidth, and, further, the connection is prevented from being forcibly cut. The value of the receiving window size (rwnd) contained in an ACK packet which is sent back to the LAN-side transmission terminal is controlled on the basis of the RTT, the discard rate and the transmission throughput measured in the WAN-side TCP communication, and on the basis of the total value of the unaligned data size of the receiving buffer, the aligned data size, the untransmitted data size of the WAN-side transmission buffer, and the ACK waiting data size. Further, when rwnd falls below a pre-set threshold value and then exceeds said value again, an ACK packet containing the value of the receiving window size (rwnd) is immediately transmitted to the LAN-side transmission terminal.

Description

technical field [0001] The present invention relates to a communication device, and in particular to a communication device for relaying communication between terminals. Background technique [0002] WAN (Wide Area Network: Wide Area Network) using IP-VPN (Internet Protocol-Virtual Private Network: Internet Protocol Virtual Private Network) technology or the like is generally used as a communication network between sites used in the cloud. [0003] When a terminal at a certain site communicates with a terminal at another site, the communication is performed via a line connecting the LAN (Local Area Network) of the site itself to the WAN, and a line connecting the WAN to the LAN of the other site. The usable bandwidth of these lines is limited by the contracted band. [0004] For communication between terminals, TCP (Transport Communication Protocol: Transport Communication Protocol) is generally used. In TCP communication, data is transferred via the send buffer of the sen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/861H04L47/27
CPCH04L47/27
Inventor 矶部隆史
Owner HITACHI LTD
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