JP2010087950A - Thin client system, thin client terminal, thin client server and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin client system which reduces the influence of the line condition of a network, performs transmission and reception of data between a server side and a client side, and can smoothly reproduce data on the client side. <P>SOLUTION: A thin client server (server device 100) controls an amount of transmission data, according to the line condition of the network, and a thin client terminal (car navigation device 200) buffers the data transmitted from the thin client server (server device 100) and receives data. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thin client system, a thin client terminal, a thin client server, and a program. In particular, the present invention is a technique for reducing the influence of a network line state and smoothly reproducing data received from the server side on the client side. The present invention relates to a thin client system that can be used as a car navigation system.

  In recent years, the adoption of server-based computing by companies is rapidly progressing, and its use is gradually increasing among general individual users. Server-based computing (thin client system) is a system in which a client device (thin client terminal) and a server device (thin client server) can be connected to each other via a network. When a service request is made to the server, the thin client server operates data management and an application program based on the service request from the thin client terminal.

  Specifically, the thin client server creates display data for the thin client terminal and sends it to the thin client terminal. In the thin client terminal, operation information such as a user key and a mouse is sent to the thin client server via the network, and display data for the thin client terminal created on the server side is received and displayed. Therefore, the thin client terminal only needs to include a network device, a display device, and an input device (such as a mouse and a keyboard), and does not have data in the device, so that storage such as a hard disk is unnecessary. Further, since the application program is not executed, the processing load required for the thin client terminal is light.

  For example, Patent Document 1 discloses a server device that enables a client-side user in a thin client system to execute a response that does not feel strange. When transmitting the screen information to be displayed on the client device, the server device divides the screen information into a plurality of block images, and after the block image is compressed, the compressed block image having a small size is given priority to the client device. Send. Further, the decompression load value is calculated using the decompression processing capability value of the compressed image of the client device, and a block image with a small decompression load is preferentially transmitted to the client device.

For example, Patent Document 2 discloses a thin client system that can reduce a network load when acquiring data from a peripheral device. In the thin client system, when a thin client server data acquisition processing instruction is input to the thin client terminal and notified to the thin client server, the thin client server requests the personal computer to execute peripheral device data acquisition processing. To do. The personal computer requests data from the peripheral device, and when the data is output by the peripheral device, the data amount of the output peripheral device data is reduced and transmitted to the thin client server.
JP 2008-211639 A JP 2006-323660 A

  By the way, the thin client system plays the role of a ubiquitous solution for general individual users. For example, digital content is centrally managed on a thin client server at home and used from a thin client terminal in the living room or on the go. It is also possible to remotely control the performance of a home thin client server by using a small and light thin client terminal on the go. Such a thin client system having various possibilities can also be applied to a car navigation system, and a thin client server at home and a network for managing map information and the like using a thin client terminal as an in-car car navigation device It is possible to connect and use.

  Here, in a car navigation system to which a thin client system is applied, the line state of the network connecting the server and the client is often unstable compared to a thin client system at home, and data received from the server side Is likely not to be played smoothly on the client side. For example, data communication with the server side may be interrupted by passing through a tunnel while a car is running, for example, map data is interrupted while using the navigation function, and music data is interrupted while using the audio function. As described above, in the car navigation system, data communication between the server and the client is greatly affected by the line state of the network.

  On the other hand, in the server device disclosed in Patent Document 1, a block image with a small size or a block image with a small decompression load on the client side is preferentially sent to the client device. Thus, data reproduction is performed slowly, which is far from smooth data reproduction as usual. Further, the thin client system disclosed in Patent Document 2 reduces the amount of data when the thin client server acquires data from the peripheral device. This is data communication between the server and the peripheral device. It is not about data communication between the server and the client, but does not realize smooth data reproduction on the client side without being affected by the network line condition.

  Accordingly, the present invention provides a thin client system or the like that reduces the influence of the network line state, performs data transmission / reception between the server side and the client side, and enables smooth data reproduction on the client side. With the goal.

  In order to achieve this object, the first thin client system of the present invention controls the amount of transmission data by the thin client server in accordance with the line state of the network, and the thin client terminal buffers the data received from the thin client server. Ring to output data. Further, the thin client terminal is configured to perform data transmission by buffering transmission data to the thin client server.

  A second thin client system according to the present invention is a thin client system including a thin client server that executes an application and a thin client terminal that exchanges data with the thin client server. Has a server transmission control means for monitoring the network line state and controlling the amount of data to be transmitted to the thin client terminal based on the line state. The thin client terminal is transmitted by the thin client server Buffering means for buffering data, and client reception control means for controlling the amount of data received from the thin client server based on the free capacity of the buffering means.

  A third thin client system according to the present invention is a thin client system including a thin client server that executes an application and a thin client terminal that exchanges data with the thin client server. The server transmission control means for monitoring the network line status and controlling the amount of data to be transmitted to the thin client terminal based on the line status, and the thin client terminal based on the receivable data amount of the own terminal And a server reception control means for controlling the amount of data received from the thin client terminal, wherein the thin client terminal buffers the data transmitted by the thin client server and the data to be transmitted to the thin client server, and the buffering Based on available capacity Data reception control means for controlling the amount of data received from the thin client server, and client transmission control for monitoring the network line status and controlling the amount of data to be transmitted to the thin client server based on the line status Means.

  A first thin client terminal according to the present invention is a thin client terminal that exchanges data with a thin client server that executes an application in a thin client system, and is a thin client server according to transmission data amount control based on a network line state. Buffering means for buffering data transmitted from the client, and client reception control means for controlling the amount of data received from the thin client server based on the free capacity of the buffering means.

  A second thin client terminal according to the present invention is a thin client terminal that exchanges data with a thin client server that executes an application in a thin client system, and is a thin client server according to control of a transmission data amount based on a network line state. And buffering means for buffering data to be transmitted to the thin client server that controls the amount of received data based on the amount of data that can be received by the terminal, and the free capacity of the buffering means, Client reception control means for controlling the amount of data received from the thin client server, client transmission control means for monitoring the network line status and controlling the amount of data to be transmitted to the thin client server based on the line status; , A.

  A first thin client server of the present invention is a thin client server that configures a thin client system together with a thin client terminal and executes an application, and includes buffering means for buffering transmitted data, and free space in the buffering means Amount of data for monitoring the network line status and performing transmission processing to the thin client terminal based on the line status when transmitting data to the thin client terminal having client reception control means for controlling the received data amount based on the capacity Server transmission control means for controlling

  A second thin client server according to the present invention is a thin client server that constitutes a thin client system together with a thin client terminal and executes an application, and includes buffering means for buffering transmitted data, and free space for the buffering means. Amount of data for monitoring the network line status and performing transmission processing to the thin client terminal based on the line status when transmitting data to the thin client terminal having client reception control means for controlling the received data amount based on the capacity Server transmission control means for controlling the server and server reception control for controlling the received data amount of the data transmitted from the thin client terminal according to the control of the transmission data amount based on the network line state based on the receivable data amount of the own terminal And means .

  A first program of the present invention is a program used in a thin client system configured to include a thin client server that executes an application and a thin client terminal that exchanges data with the thin client server. When sending data to a thin client terminal that buffers the transmitted data to the client server and controls the amount of received data based on the free space in the buffer, the network line status is monitored. A server transmission control step for controlling the amount of data to be transmitted to the client terminal is executed.

  A second program of the present invention is a program used in a thin client system configured to include a thin client server that executes an application and a thin client terminal that exchanges data with the thin client server. When sending data to a thin client terminal that buffers the transmitted data to the client server and controls the amount of received data based on the free space in the buffer, the network line status is monitored. Data transmitted from the thin client terminal in accordance with the control of the transmission data amount based on the line state of the network based on the server transmission control step for controlling the data amount to be transmitted to the client terminal and the receivable data amount of the own terminal Control the amount of received data A server receiving control step that causes the execution.

  According to the present invention, the thin client server on the data transmission side performs data transmission control according to the network line state, and the thin client terminal on the data reception side buffers the received data and outputs the data. Therefore, in the thin client system, data transmission / reception is performed between the server side and the client side regardless of the network line state, and smooth data reproduction on the client side becomes possible.

  First, an embodiment of the present invention will be described with reference to the drawings. The embodiments described below are preferred embodiments of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

[Embodiment 1]
In the first embodiment of the present invention, a thin client server is used for a server device such as a personal computer or a home server, a thin client terminal is used for a car navigation device, and the thin client system is applied to a car navigation system. It is.

  First, the configuration of the car navigation system of this embodiment will be described. FIG. 1 is a diagram showing a system configuration of the car navigation system of the present embodiment. The car navigation system of this embodiment is configured to include a server device 100 and a car navigation device 200, and both devices are connected via a network 400. The server device 100 corresponds to the thin client server recited in the claims, and the car navigation device 200 also corresponds to the thin client terminal. The network 400 may be wired or wireless.

  The server apparatus 100 includes a control unit 110, a data compression unit 120, a transmission unit 130, a reception unit 140, and a data transmission control unit 150. The control unit 110 is a functional unit that controls the entire apparatus according to a control program, executes an application in response to a request from the car navigation apparatus 200, and provides a service to the car navigation apparatus 200. Further, the control unit 110 logically includes output data generation means 111.

  The output data generation unit 111 obtains a route to the destination using the current position information and the destination information received from the car navigation device 200, and generates navigation information based on the route. Further, the output data generation unit 111 acquires not only navigation information but also data such as music data and generates it as output data to the car navigation device 200. That is, navigation information is obtained when the car navigation device is used as a car navigation system, and music data is obtained as output data when it is used as a car stereo.

  The data compression unit 120 corresponds to the data compression means described in the claims, and performs compression processing on the output data generated by the control unit 110 before being transmitted to the car navigation device 200 by the transmission unit 130. This data compression is performed on large-capacity data such as image data and music data. For example, control data is sent directly from the control unit 110 to the transmission unit 130.

  The transmission unit 130 transmits content data, control data, and the like to the car navigation device 200 via the network 400. The receiving unit 140 receives current position information, destination information, control data, and the like from the car navigation device 200 via the network 400. The data transmission control means 150 corresponds to the server transmission control means described in the claims, monitors the line state of the network 400, and controls the amount of data transmitted to the car navigation device 200 based on the line state. The transmission unit 130 performs data transmission according to the control of the data transmission control unit 150. Note that the data transmission control unit 150 may be configured to logically have, for example, the data control unit 110 as a data transmission control unit.

  Content such as map data and music data may be held and managed by the server device 100, or may be configured to be held by another server on the network. In the present embodiment, since the car navigation system is configured using the thin client system, 2D or 3D map image data as well as a realistic landscape image such as a street view is used as the navigation information. it can.

  On the other hand, the car navigation device 200 includes a buffer 210, a reception unit 220, a data decompression unit 230, a display output unit 240, a data reception control unit 250, a GPS reception unit 260, an operation input unit 270, and a transmission unit 280. The buffer 210 corresponds to buffering means described in the claims, and temporarily holds content data (navigation information, music data, etc.) from the server device 100.

  The receiving unit 220 receives content data such as navigation information and music data, and control data from the server device 100 via the network 400. The data reception control unit 250 corresponds to the client reception control means described in the claims, monitors the free capacity of the buffer 210, and controls the amount of received data based on the free capacity. The receiving unit 220 receives data according to the control of the data reception control unit 250.

  The data decompression unit 230 corresponds to data decompression means described in claims, and performs decompression processing on the data received by the reception unit 220. This data decompression is naturally performed on the content data (navigation information and music data) that has been compressed in the server device 100. The display output unit 240 displays the data expanded by the data expansion unit 230 on a display.

  The GPS receiving unit 250 receives a GPS signal from a GPS satellite and acquires current position information of the car navigation device 200. The operation input unit 260 is a functional unit that accepts input of user operation details (destination information, selected route information, etc.), and can be configured by existing input means such as a touch panel, a keyboard, and a mouse. The transmission unit 270 transmits current position information, destination information, control data, and the like to the server apparatus 100 via the network 400.

  Next, operation processing in the car navigation system according to the present embodiment will be described. FIG. 2 is a flowchart showing server-side operation processing, and FIGS. 3 to 6 are flowcharts showing client-side operation processing.

  The server device 100 on the server side starts data transmission processing in response to a data acquisition request from the car navigation device 200 on the client side. First, the data transmission control unit 150 of the server device 100 detects the line state of the network and determines the line capacity. If the line state is good and the line capacity is sufficient (step S101 / (a)), the data transmission control unit 150 performs setting for increasing the transmission capacity to the transmission unit 130 (step S102). And it inquires of the data reception control part 250 of the car navigation apparatus 200 whether it may transmit with the set data capacity (step S103).

  If the line capacity is sufficient but sufficient (step S101 / (b)), the data transmission control unit 150 sets the transmission capacity as normal and does not change the setting, and determines whether or not data transmission is possible. 250 is inquired (step S113). When the line state is bad and the line capacity is insufficient (step S101 / (c)), the data transmission control unit 150 performs setting for the transmission unit 130 to reduce the transmission capacity from the normal level (step S122). The data reception control unit 250 is inquired of whether or not data transmission is possible (step S123). After inquiring whether transmission is possible, a response from the car navigation device 200 is awaited.

  In the car navigation device 200 on the client side, the data reception process is started with the notification from the server device 100 as a trigger. First, the data reception control unit 250 of the car navigation device 200 grasps the transmission capacity related to the inquiry from the server device 100 (step S201).

  In response to the inquiry (step S201 / (a)) when the transmission capacity increase is set, the data reception control unit 250 determines the receivable capacity by detecting the free capacity of the buffer 210 (step S301). When the receivable capacity is sufficient (step S301 / (a)), the data reception control unit 250 performs setting for the reception unit 220 to increase the reception capacity more than usual (step S302). A reception permission response is then sent to the data transmission control unit 150 of the server apparatus 100 (step S303). If the receivable capacity is not sufficient, but is sufficient (step S301 / (b)), the data reception control unit 250 sets the reception capacity as normal and does not change the setting, and sends a reception rejection response to the data transmission control unit 150. (Step S304). When the receivable capacity is insufficient (step S301 / (c)), the data reception control unit 250 performs setting for the reception unit 220 to reduce the reception capacity from the normal value (step S305), and the reception capacity reduction is performed. A response is sent to the data transmission control unit 150 (step S306).

  In response to the inquiry (step S201 / (b)) at the time of transmission capacity maintenance setting, the data reception control unit 250 detects the free capacity of the buffer 210 and determines the receivable capacity (step S401). If the receivable capacity is sufficient or not sufficient (step S401 / (a)), the data reception control unit 250 sets the reception capacity as normal and does not change the setting, and changes the reception permission response to data. The transmission control unit 150 is performed (step S402). When the receivable capacity is insufficient (step S401 / (b)), the data reception control unit 250 performs setting for the reception unit 220 to reduce the reception capacity below normal (step S403), and the reception capacity reduction is performed. A response is sent to the data transmission control unit 150 (step S404).

  Also, in response to the inquiry at the time of transmission capacity reduction setting (step S201 / (c)), the data reception control unit 250 performs setting for the reception unit 220 to decrease the reception capacity from normal (step S501) A permission response is sent to the data transmission control unit 150 (step S502). The client-side car navigation device 200 waits for data transmission from the server device 200 after responding to the server device 200.

  In the server device 100, after making an inquiry regarding the setting for increasing the transmission capacity (step S103), the data transmission control unit 150 obtains a response from the data reception control unit 250 of the car navigation device 200 (step S104). When the response content is reception permission (step S105 / YES), the data transmission control unit 150 causes the transmission unit 130 to perform data transmission with the increased transmission capacity (step S109). When the response content is not reception permission (step S105 / NO) and the reception capacity is reduced (step S106 / YES), the data transmission control unit 150 sets a setting for reducing the transmission capacity from normal to the transmission unit 130. (Step S108), and causes the transmission unit 130 to perform data transmission (step S109). If the response content is neither reception permission (NO in step S105) nor reduction in reception capacity (NO in step S106), the data transmission control unit 150 cancels the increase setting of the transmission capacity and sets it to the normal transmission capacity. (Step S107), the transmission unit 130 performs data transmission (Step S109).

  In addition, after making an inquiry about the setting for maintaining the transmission capacity (step S113), the data transmission control unit 150 acquires a response from the data reception control unit 250 (step S114). If the response content is a decrease in reception capacity (step S115 / YES), the data transmission control unit 150 performs setting for the transmission unit 130 to decrease the transmission capacity from normal (step S108), and sends data to the transmission unit 130. Transmission is performed (step S109). If the response content is not a decrease in reception capacity (step S115 / NO), the data transmission control unit 150 causes the transmission unit 130 to perform data transmission with the set transmission capacity (step S109).

  In addition, after making an inquiry regarding the setting of transmission capacity reduction (step S123), the data transmission control unit 150 obtains a response from the data reception control unit 250 (step S124), and performs data transmission to the transmission unit 130 with the set transmission capacity. (Step S109). In the server apparatus 100, after transmitting data to the car navigation apparatus 200 in this manner, the server transmission process is terminated.

  The car navigation device 200 receives the data transmitted from the server device 100 (step S307, step S405, step S503). Specifically, the transmitted data is buffered in the buffer 210, and the receiving unit 220 sequentially performs data reception processing. After receiving data from the server apparatus 100 in this way, the client reception process is terminated.

  According to the present embodiment, the server side performs data transmission control according to the line state, and the client side includes a buffer and performs data reception control according to the receivable capacity of the buffer. Smooth data reproduction on the client side is possible without being affected as much as possible.

  In addition, according to the present embodiment, since the buffer that holds the reception data is provided on the client side, even when navigation information that is different from the navigation information that has already been transmitted is transmitted to the client side, the difference data of the navigation information is stored. The data processing load can be reduced and the processing speed can be increased.

[Embodiment 2]
In the second embodiment of the present invention, a thin client system is applied to a car navigation system as in the first embodiment, but a video camera device is used as a further thin client terminal, and a server device and a video camera device are used. It is configured to perform data communication even between. Hereinafter, configurations and operations different from those of the first embodiment will be described, but points not mentioned in the description are common to the first embodiment.

  First, the configuration of the car navigation system of this embodiment will be described. FIG. 7 is a diagram showing a system configuration of the car navigation system of the present embodiment. The car navigation system according to this embodiment includes a server device 101, a car navigation device 200, and a video camera device 300, and these devices are connected via a network 400. The server device 100 corresponds to the thin client server recited in the claims, and the car navigation device 200 and the video camera device 300 correspond to the thin client terminals recited in the claims.

  The configuration of the server apparatus 101 is generally the same as that of the first embodiment, but differs from the first embodiment in that it includes a data reception control unit 160 and a data decompression unit 170. The data reception control unit 160 corresponds to the server reception control means described in the claims, and controls the received data amount based on the receivable data amount of the terminal itself. The data decompression unit 170 performs decompression processing on video data (moving image data) received by the reception unit 140 from the video camera device 300. Note that the data transmission control unit 150 and the data reception control unit 160 may be configured to logically have, for example, the data control unit 110 as a data transmission control unit or a data reception control unit.

  As will be described later, the video camera device 300 compresses moving image data before transmission. As described above, in this embodiment, the server apparatus 101 exchanges content data (moving image data) with the video camera apparatus 300, and controls the amount of transmission data together with data compression before data transmission and data expansion after data reception. By doing so, the influence of the line condition of the network is minimized.

  The video camera device 300 is the same thin client terminal as the car navigation device 200, but has a different configuration and function. Although the car navigation device 200 mainly receives content data from the server device and does not transmit content data to the server device, the video camera device 300 transmits and receives content data (moving image data) to and from the server device 101. I do.

  The video camera device 300 includes a buffer 310, a buffer 315, a reception unit 320, a data decompression unit 330, a display output unit 340, a data reception control unit 350, a moving image data input unit 360, an operation input unit 365, a data compression unit 370, and a transmission unit. 380 and a data transmission control unit 390. The buffer 310, the reception unit 320, the data decompression unit 330, the display output unit 340, and the data reception control unit 350 are the same as those in the first embodiment, with regard to data reception and data reproduction. Note that the video camera device 300 needs to receive and reproduce data from the server device 101 when displaying the captured image on a display for confirmation or the like. This is because, as a feature of the thin client system, a data storage mechanism is not provided on the client side, and data is held on the server side.

  On the other hand, the moving image data input unit 360, the operation input unit 365, the data compression unit 370, the transmission unit 380, the buffer 315, and the data transmission control unit 390 are configurations related to content data transmission and are not configured in the first embodiment. The moving image data input unit 360 shoots an image of an object such as a landscape or a person to generate moving image data. Also, the moving image data input unit 360 can generate still image data by taking a picture of an object as well as a moving image. The data compression unit 370 corresponds to the data compression unit described in the claims, and performs compression processing on the data generated by the moving image data input unit 360. The operation input unit 365 receives input of user operation details.

  The transmission unit 380 transmits the data compressed by the data compression unit 370 to the server apparatus 101. The buffer 315 corresponds to the buffering means described in the claims, and temporarily holds the content data (moving image data or still image data) transmitted by the transmitting unit 380. The data transmission control unit 390 corresponds to the client transmission control unit described in the claims, monitors the line state of the network 400, and controls the amount of data transmitted to the server apparatus 101 based on the line state. The transmission unit 380 performs data transmission according to the control of the data transmission control unit 390.

  Next, operation processing in the car navigation system according to the present embodiment will be described. Of the data communication between the server apparatus 101 and the video camera apparatus 300, data transmission / reception from the server apparatus 101 to the video camera apparatus 300 is the same as in the first embodiment. However, data transmission / reception from the video camera apparatus 300 to the server apparatus 101 in the reverse direction is performed in the same flow. 2 is performed by the data transmission control unit 390 of the video camera device 300 on the data transmission side, and the data reception control unit 160 of the server device 101 on the data reception side performs the operation processing according to the flow shown in FIG. 3 to 6 are performed in accordance with the flow shown in FIG.

  By configuring as in the present embodiment, for example, video data captured from a video camera device is transmitted to the server device, and the server device collates with position information from the car navigation device, and synthesizes the video data on the map data. Thus, original navigation information can be generated and displayed on the car navigation device.

  The above-described embodiment is a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiment alone, and various modifications are made without departing from the gist of the present invention. Implementation is possible.

  As an example to which the present invention can be applied, a device in which buffer control is effective (a device requiring continuity) can be considered. As an output system client device that outputs data from the server side, in addition to the navigation shown as the embodiment, a TV, 3 player / display device, door phone / door phone transfer machine, game machine, electronic book, mobile phone, media player, Clock (world clock) etc. are mentioned.

  In addition to the video camera shown in the embodiment, the input client device that inputs data to the server device analyzes the content captured by a digital camera, voice recorder, TV phone, robot, sound or camera, and feeds back the results. Devices, scanners, electronic notebooks (tablets), electronic scrapbooks (devices for taking magazines and the like), live recorders (devices that keep taking pictures of cars and the surroundings), and the like.

  Other devices that can be incorporated into the thin client system include a program calculator, an electronic dictionary, an electronic translator, a home controller, and a barcode reader.

  For example, when a mobile phone is used as a thin client terminal, in response to an inquiry from the mobile phone, the server checks the location information from the car navigation device and transmits the telephone number data of facilities around the traveling area to the mobile phone. It can also be configured as follows.

  In addition, the program executed in the thin client system applied in the present embodiment has a module configuration including the above-described units (server transmission control unit, server reception unit, etc.), and uses actual hardware. To realize concrete means. That is, when the computer (CPU) reads a program from a predetermined recording medium and executes the program, each of the above means is loaded onto the main storage device, and server transmission control means, server reception means, etc. are generated on the main storage device. . The server transmission control means and the server reception means can be realized by reading the program on the thin client server, or the client reception control means and the client transmission control means can be realized by reading the program on the thin client terminal.

  The program executed by the thin client system applied in the present embodiment may be configured to be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. Further, the program may be provided or distributed via a network such as the Internet.

  The program is a file in an installable or executable format, such as a floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, DVD, nonvolatile memory card, or the like. It may be configured to be provided by being recorded on a computer-readable recording medium. Further, the program may be provided by being incorporated in advance in a ROM or the like.

  In this case, the program code itself read from the recording medium or loaded and executed through the communication line realizes the functions of the above-described embodiments. And the recording medium which recorded the program code comprises this invention.

1 is a diagram showing a system configuration of a car navigation system according to an embodiment of the present invention. It is the flowchart showing the operation process by the side of the server in the car navigation system which concerns on embodiment of this invention. It is the flowchart showing the operation process by the side of the client in the car navigation system concerning the embodiment of the present invention. It is the flowchart showing the operation process by the side of the client in the car navigation system concerning the embodiment of the present invention. It is the flowchart showing the operation process by the side of the client in the car navigation system concerning the embodiment of the present invention. It is the flowchart showing the operation process by the side of the client in the car navigation system concerning the embodiment of the present invention. 1 is a diagram showing a system configuration of a car navigation system according to an embodiment of the present invention.

Explanation of symbols

100, 101 Server apparatus 110 Control unit 111 Output data generation means 120, 370 Data compression unit 130, 280, 380 Transmission unit 140, 220, 320 Reception unit 150, 390 Data transmission control unit 160, 250, 350 Data reception control unit 170 , 230, 330 Data decompression unit 200 Car navigation device 210, 310, 315 Buffer 240, 340 Display output unit 260 GPS reception unit 270, 365 Operation input unit 300 Video camera device 360 Video data input unit 400 Network

Claims (27)

  A thin client system, wherein a thin client server controls a transmission data amount according to a line state of a network, and a thin client terminal performs data reception by buffering data transmitted from the thin client server.   The thin client system according to claim 1, wherein the thin client terminal performs data transmission by buffering transmission data to the thin client server. A thin client system configured to include a thin client server that executes an application, and a thin client terminal that exchanges data with the thin client server,
The thin client server
Server transmission control means for monitoring the line state of the network and controlling the amount of data to be transmitted to the thin client terminal based on the line state;
The thin client terminal
Buffering means for buffering data transmitted by the thin client server;
A thin client system, comprising: a client reception control unit that controls an amount of data received from the thin client server based on an available capacity of the buffering unit.   The server transmission control means increases the amount of data to be transmitted when the network has a sufficient line capacity, maintains the data amount when the line capacity is sufficient, and the line capacity is insufficient. 4. The thin client system according to claim 3, wherein the data amount is reduced in a case.   The client reception control means permits the thin client server to receive the increased transmission data when there is a free space in the buffering means, and when the free capacity is sufficient, the client reception control means 5. The thin client system according to claim 4, wherein reception of transmission data is rejected, and a decrease in transmission data is requested when the free space is insufficient. A thin client system configured to include a thin client server that executes an application, and a thin client terminal that exchanges data with the thin client server,
The thin client server
Server transmission control means for monitoring the line state of the network and controlling the amount of data to be transmitted to the thin client terminal based on the line state;
Server reception control means for controlling the amount of data received from the thin client terminal based on the amount of receivable data of the terminal,
The thin client terminal
Buffering means for buffering data transmitted by the thin client server and data to be transmitted to the thin client server;
Data reception control means for controlling the amount of data received from the thin client server based on the free capacity of the buffering means;
A thin client system comprising: a client transmission control unit that monitors a line state of a network and controls a data amount to be transmitted to the thin client server based on the line state.   The server transmission control unit and the client transmission control unit increase the amount of data to be transmitted when the network has a sufficient line capacity, and maintain the data amount when the line capacity is sufficient. 7. The thin client system according to claim 6, wherein when the capacity is insufficient, the data amount is reduced.   The client reception control means permits the thin client server to receive the increased transmission data when there is a free space in the buffering means, and when the free capacity is sufficient, the client reception control means 8. The thin client system according to claim 7, wherein reception of transmission data is rejected, and a decrease in transmission data is requested when the free space is insufficient.   The server reception control means allows the thin client terminal to receive the increased transmission data when there is a margin in the receivable data amount of the own terminal, and when the free capacity is sufficient, 9. The thin client system according to claim 8, wherein reception of transmission data is rejected, and a decrease in transmission data is requested when the free space is insufficient.   10. The thin client server and the thin client terminal each include data compression means for compressing data, and data decompression means for decompressing data compressed by the data compression means. The thin client system according to claim 1. In a thin client system, a thin client terminal that exchanges data with a thin client server that executes an application,
Buffering means for buffering data transmitted from the thin client server according to transmission data amount control based on network line conditions;
Client reception control means for controlling the amount of data received from the thin client server based on the free capacity of the buffering means;
A thin client terminal comprising:   The client reception control means permits the thin client server to receive the increased transmission data when there is a free space in the buffering means, and when the free capacity is sufficient, the client reception control means 12. The thin client terminal according to claim 11, wherein reception of transmission data is rejected, and a decrease in transmission data is requested when the free space is insufficient. In a thin client system, a thin client terminal that exchanges data with a thin client server that executes an application,
Buffers data transmitted from the thin client server according to the transmission data amount control based on the network line status and data transmitted to the thin client server that controls the received data amount based on the receivable data amount of the terminal itself Buffering means for ringing;
Client reception control means for controlling the amount of data received from the thin client server based on the free capacity of the buffering means;
Client transmission control means for monitoring the network line status and controlling the amount of data to be transmitted to the thin client server based on the line status;
A thin client terminal comprising:   The client transmission control means increases the amount of data to be transmitted when the network has a sufficient line capacity, maintains the data amount when the line capacity is sufficient, and the line capacity is insufficient. The thin client terminal according to claim 13, wherein the data amount is reduced in some cases.   The client reception control means permits the thin client server to receive the increased transmission data when there is a free space in the buffering means, and when the free capacity is sufficient, the client reception control means The thin client terminal according to claim 14, wherein reception of transmission data is rejected, and a decrease in transmission data is requested when the free space is insufficient. Data compression means for compressing data;
Data decompression means for decompressing the data compressed by the data compression means;
The thin client terminal according to claim 11, comprising: A thin client server that configures a thin client system together with a thin client terminal and executes an application,
Monitors the network line status during data transmission to the thin client terminal having buffering means for buffering transmitted data and client reception control means for controlling the amount of received data based on the free capacity of the buffering means And a server transmission control means for controlling a data amount to be transmitted to the thin client terminal based on the line state.   The server transmission control means increases the amount of data to be transmitted when the network has a sufficient line capacity, maintains the data amount when the line capacity is sufficient, and the line capacity is insufficient. The thin client server according to claim 17, wherein the data amount is reduced in a case. A thin client server that configures a thin client system together with a thin client terminal and executes an application,
Monitors the network line status during data transmission to the thin client terminal having buffering means for buffering transmitted data and client reception control means for controlling the amount of received data based on the free capacity of the buffering means And server transmission control means for controlling the amount of data to be transmitted to the thin client terminal based on the line state;
Server reception control means for controlling the received data amount of the data transmitted from the thin client terminal according to the control of the transmitted data amount based on the network line state, based on the receivable data amount of the own terminal;
A thin client server characterized by comprising:   The server transmission control means increases the amount of data to be transmitted when the network has a sufficient line capacity, maintains the data amount when the line capacity is sufficient, and the line capacity is insufficient. 20. The thin client server according to claim 19, wherein the data amount is reduced in the case.   The server reception control means allows the thin client terminal to receive the increased transmission data when there is a margin in the receivable data amount of the own terminal, and when the free capacity is sufficient, 21. The thin client server according to claim 20, wherein reception of transmission data is rejected, and a decrease in transmission data is requested when the free space is insufficient. Data compression means for compressing data;
Data decompression means for decompressing the data compressed by the data compression means;
The thin client server according to claim 17, comprising: A program used for a thin client system configured to include a thin client server that executes an application and a thin client terminal that exchanges data with the thin client server,
In the thin client server,
When transmitting data to the thin client terminal that buffers the transmitted data and controls the amount of received data based on the free space of the buffer, the network status of the network is monitored, and based on the status of the line, the thin client A program for executing a server transmission control step for controlling the amount of data to be transmitted to a terminal.   The server transmission control step increases the amount of data to be transmitted when the network has a sufficient line capacity, and maintains the data amount when the line capacity is sufficient, and the line capacity is insufficient. 24. The program according to claim 23, wherein the data amount is reduced in a case. A program used for a thin client system configured to include a thin client server that executes an application and a thin client terminal that exchanges data with the thin client server,
In the thin client server,
When transmitting data to the thin client terminal that buffers the transmitted data and controls the amount of received data based on the free space of the buffer, the network status of the network is monitored, and based on the status of the line, the thin client A server transmission control step for controlling the amount of data to be transmitted to the terminal;
A server reception control step for controlling the reception data amount of data transmitted from the thin client terminal according to the control of the transmission data amount based on the network line state, based on the receivable data amount of the own terminal;
A program characterized by having executed.   The server transmission control step increases the amount of data to be transmitted when the network has a sufficient line capacity, and maintains the data amount when the line capacity is sufficient, and the line capacity is insufficient. 26. The program according to claim 25, wherein the data amount is reduced in a case.   The server reception control step allows the thin client terminal to receive the increased transmission data if there is a margin in the receivable data amount of the own terminal, and if the free capacity is sufficient, 27. The program according to claim 26, wherein reception of transmission data is rejected, and a decrease in transmission data is requested when the free space is insufficient.

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