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Communication system, communication terminal, relay node, communication method used therein, and program thereof

A communication terminal and relay node technology, applied in the field of communication systems, can solve problems such as throughput reduction

Inactive Publication Date: 2013-02-20
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in such a case, the second technique will have the opposite effect, and the throughput will decrease compared with the case of using the existing TCP.

Method used

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  • Communication system, communication terminal, relay node, communication method used therein, and program thereof
  • Communication system, communication terminal, relay node, communication method used therein, and program thereof
  • Communication system, communication terminal, relay node, communication method used therein, and program thereof

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Embodiment Construction

[0114] Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a transmission terminal according to an embodiment of the present invention. In FIG. 1 , a terminal 1 is composed of a data generation unit 11 that generates transmission data, and a data transmission control unit 12 that transmits the generated data.

[0115] The data transmission control unit 12 is composed of a packet transmission unit 13 that controls packet output according to an assigned congestion window, an ACK (acknowledgment) reception unit 14 that receives a delivery acknowledgment packet from a receiving terminal not shown in the figure, and detects packet loss and judges network failure. The congestion judging unit 15 for the degree of congestion and the congestion window determining unit 16 for determining the size of the congestion window are constituted.

[0116] Here, in this embodiment, the throughput is a...

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Abstract

In a terminal (1), when a connection is established, a packet generated by a data generating part (11) is outputted from a packet transmitting part (13). In the terminal (1), an ACK receiving part (14) receives an ACK packet transmitted as a receipt acknowledgement response to the foregoing transmitted packet. In the terminal (1), when the ACK packet is received, a cumulative band difference calculating part (18) calculates an accumulation or history of differences each between a target band and an actual output band. A target congestion window calculating part (20) defines, based on the cumulative band difference, a target congestion window. A congestion window limited-value calculating part (19) defines the upper limit of the congestion window. In the terminal (1), when the discarding of a packet is detected, it is not that the congestion window is reduced by one-half but that a smaller one of the target congestion window and the congestion window limited-value is used as a new congestion window.

Description

technical field [0001] The present invention relates to a communication system, a communication terminal, a relay node, a communication method for these devices, and a program thereof, and particularly relates to a communication system having a congestion control mechanism and a throughput control mechanism at the session layer. Background technique [0002] At present, various applications are used on the network, and each of these applications requires different qualities from the network. For example, in real-time applications, low transmission time, high bandwidth, or low packet loss probability are required compared to other applications. On the other hand, in applications that do not require real-time performance, long transmission times, low bandwidth, or high discards are tolerated compared to applications that require real-time performance. [0003] As the first technique for realizing bandwidth control for each application in the network, there is a bandwidth allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16H04L12/801H04L29/06H04L47/27H04L47/43
CPCH04L47/12H04L69/163H04L47/32H04L47/10H04L47/225H04L1/1607H04L47/193H04L29/06115H04L47/27
Inventor 下西英之
Owner NEC CORP