JP2009122879A - Thin client system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To store and browse picture data to be transmitted from a server device in a client device in a thin client system. <P>SOLUTION: A RAM for storing picture data is loaded on a client device, and when a network between the client device and a service is satisfactory, picture data transmitted from a server device to the client device are stored. When the network is disconnected, the picture data stored in the client device can be browsed. When the picture data are stored in the RAM, the picture data are erased according as the power source of the client device is turned off, or an operation system is shut down so that security can be maintained. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a thin client system, and more particularly to a thin client system that can reduce dependence on a network environment and reduce communication costs or improve convenience in a low-quality network environment.

  In recent years, due to frequent leakage of privacy information, protection of personal information has been strongly demanded, and thin client type information processing systems are attracting attention.

  In a thin client type information processing system, a client device operated by a user is used to remotely control a desktop on a server device managed by a company and use various application programs and data installed in the server device. To do.

  The client device must be equipped with a communication program for connecting the client device and the server device, a remote desktop program for causing the client device to function as an input / output device for the server device, and an operation system program for operating these programs. .

  Since the client device has only an input / output function for the server device and no data or program, it is possible to eliminate the possibility of information leakage in the case of theft or loss.

  As a prior art, there has been proposed a method for guaranteeing operation even in a communication disabled state by installing a gateway for storing input information between a client device and a server device.

JP 2004-171063 A

  A thin client type information processing system requires a network between the client device and the server device even when the user is away from home. When the network quality between the client device and the server device deteriorates, a problem occurs in the input / output operation in the client device.

  In the conventional thin client system, when the communication delay between the client device and the server device occurs or is disconnected due to the deterioration of the network quality, the response delay for the input / output operation to the server device becomes impossible, and the operation becomes impossible. Cannot be used at all.

  Also in Patent Document 1, input / output operations can be temporarily stored in the gateway, but there is a problem that all operations cannot be performed if a network connection between the client terminal, the gateway, and the server device cannot be established.

  The present invention has been made with respect to the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a method for browsing information of a server device even when the network is disconnected.

  The thin client system according to claim 1 of the present invention has a RAM mounted on the client device, and temporarily stores screen data transmitted from the server device to the client device in the RAM, and the network is disconnected. The client device has a data browsing function.

  The information stored in the client device is only the screen data of the server device, and does not store any data such as application files.

  According to the present invention, it is possible to provide means for storing information on the server device in the RAM of the client device so that the data can be browsed by the client device alone even when the communication situation deteriorates.

  FIG. 5 is a diagram illustrating a configuration example of a client device, and a general client device will be described with reference to FIG. The client device includes a CPU 501, a RAM 505 that is a work area of the CPU 501, a network function 506 for connecting to the access point 5 through a wireless network, and a ROM 502 in which the BIOS 503 and the operation system 504 are mounted.

  After power-on, the CPU 501 accesses the ROM 502, executes the BIOS 503, and activates each system of the client device.

  The operation system 504 controls the network function 506, establishes a network connection to the access point 5, and establishes communication with the server device 1.

  Next, embodiments of the present invention will be described with reference to the drawings. In addition, each figure referred in the following description has attached | subjected the same code | symbol as another figure.

  FIG. 1 is a schematic diagram showing an embodiment of a thin client system according to the present invention. As shown in FIG. 1, the thin client system of the present embodiment includes a server device 1, a remote access authentication server 2, an access point 5, and a client device 6.

  The server device 1 is connected to a LAN 3 that is a managed internal network such as a company or a data center. The LAN 3 is connected to the remote access authentication server 2. The remote access authentication server 2 is connected to the WAN 4.

  The client device 6 is connected to the access point 5 of an external network such as a place where the user is away or to the WAN 4 via an external network constructed at home or the like.

  The server device 1 establishes a VPN with the client device 6, receives an input signal sent from the client device 6, executes processing, and displays screen data that closes the processing result of the server device 1 as the client device. 6 to send.

  The remote access authentication server 2 authenticates the client device 6 that is accessed from the external network, and connects the client device 6 that has been successfully authenticated to the server device 1.

  FIG. 4 is a configuration diagram of the client device for enabling the client device to view the screen data of the server device even when the network state between the client device and the server device deteriorates. While the network state is good, the screen data on the server device is stored in the screen data storage area 408 in the RAM 407 mounted on the client device by the screen data storage function 405. When the network state deteriorates, the data browsing function 406 can browse the data in the screen data storage area 408.

  FIG. 3 is a block diagram showing an embodiment of a thin client system according to the present invention. As shown in FIG. 3, the thin client system according to the present embodiment has a configuration in which the client device 6 includes a screen data storage function 302 and a data browsing function 301. The screen data storage function 302 and the data browsing function 301 are functions for storing screen data transmitted from the server apparatus 1 by the network function 303 and browsing the stored screen data even when the network connection is disconnected.

  FIG. 2 is a flowchart for explaining the operation of the client device 6. The screen data transmitted from the server device 1 in a state where communication is established is stored in the client device (S201).

  When the network connection cannot be maintained (N in S202), the screen data stored in the RAM 302 can be browsed by disconnecting the server device and selecting the viewing mode within a certain time (Y in S204). It is possible (S205). When the browsing mode is not selected (N in S204), the screen data stored in the RAM 302 is deleted (S207), and the process ends when the client device is turned off (S208).

  Even when the network connection can be maintained (Y in S202), it is possible to browse the screen data stored in the RAM 302 by selecting the viewing mode (Y in S203) to reduce the communication cost (S205). ).

  If the network connection can be maintained (Y in S202) and the browsing mode is not selected (N in S203), the business is continued while the network of the client device and the server device is connected as they are.

It is a block diagram which shows one Embodiment of the thin client system by this invention. It is a flowchart explaining operation | movement of the thin client system by this invention. It is a block diagram which shows the structure of the thin client system by this invention. It is a block diagram which shows the detailed structure of the client apparatus in the thin client system by this invention. It is a block diagram which shows the detailed structure of the client apparatus in the conventional thin client system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Server apparatus 2 ... Remote access authentication server 3 ... Internal network (LAN)
4 ... WAN
5 ... Access point 6 ... Client device

Claims (4)

In a thin client system including a server device that executes an application program and a client device that exchanges data with the server device,
Screen data storage means for temporarily storing the screen data received from the server device on the client device;
Screen browsing means for browsing the screen data stored on the client device when the network connection is disconnected;
A thin client system comprising: means for erasing screen data stored by turning off the power of the client device or shutting down the operation system.   The thin client system according to claim 1, wherein the screen data storage unit is realized by software installed on the client device.   The screen browsing unit realizes browsing of the screen data stored by the screen data storage unit even in a situation where the network between the server device and the client device is disconnected. The described thin client system.   4. The thin client system according to claim 3, wherein the screen data storage means further includes data erasure means for erasing data when the client apparatus is powered off or the operation system is shut down.

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