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communication device

A communication device and frequency band technology, applied in electrical components, transmission systems, etc., can solve problems such as limited bandwidth, and achieve the effect of ensuring communication frequency band, fair frequency band utilization, and realization of frequency band utilization

Inactive Publication Date: 2016-11-09
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These lines limit the usable bandwidth due to the protocol band

Method used

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Experimental program
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Embodiment 1

[0053] First, use figure 1 The problem to be solved by the present invention will be described.

[0054] figure 1 Shows the configuration diagram of a network system including communication devices.

[0055] Communication devices (also referred to as relay devices. Hereinafter, abbreviated as devices) 101 and 102 and routers 186 are installed on communication lines connecting LANs 110, 120, 130 and WAN 140 in a plurality of bases. In addition, a plurality of computers 111, 112, and 113 are connected to the communication device 101 via the LAN 110. The plurality of computers 121, 122, and 123 are connected to the communication device 102 via the LAN 120.

[0056] In addition, the communication devices 101 and 102 and the WAN 140 are connected through access lines 191 and 192.

[0057] The communication device 101 has, for example, a transmission band control unit 150 that selects and executes a transmission band control mode of proprietary TCP (Japanese: Unique TCP) as disclosed in Pa...

Embodiment 2

[0163] (Processing for changing the communication mode)

[0164] The following describes an example of changing the communication mode according to whether the target device corresponds to the proprietary TCP when the communication device corresponding to the proprietary TCP starts data communication, unless otherwise specified. figure 1 Communication device 100 and figure 2 The configuration of the communication device is the same as the above-mentioned embodiment.

[0165] Use the sequence diagram in Figure 18 and Figure 19 ~ Figure 20 Flow chart and Figure 23 The table format diagram of the TCP control unit 707 / 703 will describe the details of the method for determining the communication mode (friendly_mode532 or one-way_mode533) described in the status table 212 by the TCP control unit 707 / 703.

[0166] Initially, using Figure 23 The format of the mode / lowest frequency band specification table 740 will be described.

[0167] The mode / lowest frequency band designation table 740 ...

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Abstract

In an environment such as a WAN with a large RTT, a large number of hops, and many places where discards occur, the dedicated TCP communication that can obtain a large throughput can prevent the line bandwidth from being occupied even if it conflicts with the normal TCP communication. A communication device for controlling a transmission frequency band of TCP communication is provided with: no congestion is detected in the TCP communication, and the transmission frequency band of the TCP communication is linearly adjusted for a certain period of time after the data part of which the reception confirmation is completed is in an update state. Mechanism for increasing; Mechanism for non-linearly increasing the transmission frequency band after the above-mentioned certain period has elapsed; Mechanism for detecting congestion by using the rate of change of the discard rate and retransmission rate in the above-mentioned TCP communication; Utilizing the transmission frequency band and the retransmission frequency band A mechanism for estimating the retransmission rate and its change rate from the past history; a mechanism for estimating the discard rate and its change rate using the past history of the transmission frequency band and the number of ACK receptions.

Description

Technical field [0001] The present invention relates to a communication device, a frequency band (Japanese: band domain) control method, and a communication system, and more particularly to a communication device that controls the communication frequency band between computers. Background technique [0002] As a communication network between bases used in the cloud, etc., a WAN (Wide Area Network) that applies technologies such as IP-VPN (Internet Protocol-Virtual Private Network) is generally used. [0003] When a computer such as a terminal in a certain base communicates with a terminal in another base, it communicates via a line connecting its own base LAN (Local Area Network) and a WAN, and a line connecting WAN to another base LAN . These lines limit the available bandwidth due to the protocol band. [0004] TCP (Transmission Control Protocol, Transmission Control Protocol) is generally used in communication between terminals. In TCP communication, for the data sent by the se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04L47/27
CPCH04L69/16H04L41/0896H04L47/127H04L47/193H04L47/25H04L47/00
Inventor 矶部隆史
Owner HITACHI LTD