Classifications

• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
  • G06F12/02—Addressing or allocation; Relocation
  • G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
  • G06F12/12—Replacement control
  • G06F12/121—Replacement control using replacement algorithms
  • G06F12/126—Replacement control using replacement algorithms with special data handling, e.g. priority of data or instructions, handling errors or pinning
• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
  • G06F16/90—Details of database functions independent of the retrieved data types
  • G06F16/95—Retrieval from the web
  • G06F16/957—Browsing optimisation, e.g. caching or content distillation
  • G06F16/9574—Browsing optimisation, e.g. caching or content distillation of access to content, e.g. by caching

Definitions

• the present invention relates to a data storage system, and more particularly, to a data storage system that stores data transmitted from an information center in an in-vehicle terminal device.
• this type of data storage system has a client as disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-108686 (pages 4 to 5, FIG. 1).
• a cache for temporarily storing data obtained from the server is provided. If the data requested by the client is stored in the cache on the client side thereafter, the stored cache data is referred to. As a result, the communication time between the client and the server is reduced.
• the data sent from the server may be temporarily stored in a cache on the client side and then updated in the server. Therefore, when the client refers to the cache data on the client side, the client always accesses the server, and whether or not the data is updated in the server after being stored in the cache on the client side.
• communication time and communication costs are required because it is necessary to check the information by using updated information.
• the present invention has been made to solve such a problem, and a data storage system which can omit confirmation of data update information and can reduce communication time and communication cost. It provides Disclosure of the invention
• the data storage system of the present invention includes an in-vehicle terminal device mounted on a vehicle, and an information center for transmitting data to the in-vehicle terminal device in response to a request from the in-vehicle terminal device.
• the on-board terminal communication means for communicating with the information center, the temporary cache means for temporarily storing the data, the permanent cache means for storing the data for a predetermined period, and the data received by the on-board terminal communication means.
• Cache selection means for selecting which of said temporary data and said permanent cache means to store said data, wherein said information center communicates with said in-vehicle terminal device; , Temporary cache data for storing the data in the temporary cache means, and permanent cache data for storing in the permanent cache means. It has a configuration which is characterized that you have a data classification means for classifying into a data.
• the data classification unit classifies the data into temporary cache data stored in the temporary cache unit of the vehicle-mounted terminal device and permanent cache data stored in the permanent cache unit of the vehicle-mounted terminal device.
• the persistent cache data stored in the persistent cache means in the in-vehicle terminal device, it is possible to omit the confirmation of the update information of the data, thereby reducing communication time and communication cost. be able to.
• the in-vehicle terminal communication unit receives data classification information when receiving the data from the information center, and the cache selection unit is configured to receive the data classification information based on the data classification information.
• the data received by the in-vehicle terminal communication means is selected to be stored in either the temporary cache means or the permanent cache means. Have.
• the cache selection unit selects whether to store the data received from the information center in the temporary cache unit or the permanent cache unit based on the data classification information. And persistent cache data can be reliably categorized.
• the information center is provided with a free space acquisition unit for acquiring a free space of the permanent cache unit.
• the information center can acquire the free space of the permanent cache means.
• the data storage system has a configuration in which the information center includes a data deletion unit that deletes the permanent cache data stored in the permanent cache unit.
• the information center can delete the persistent cache data stored in the persistent cache when the free space of the persistent cache is insufficient.
• the in-vehicle terminal device of the present invention communicates with an information center for transmitting data.
• An on-board terminal communication means a temporary cache means for temporarily storing the data, a permanent cache means for storing the data for a predetermined period, and a temporary cache means and the permanent cache means for storing the data.
• a cache selecting means for selecting which one to store.
• the cache selection unit selects one of the temporary cache unit and the permanent cache unit to store the data received by the information center, and thus classifies the temporary cache data and the permanent cache data. be able to.
• An information center includes an information center communication means for transmitting data to the on-board terminal device in response to a request from an on-board terminal device mounted on a vehicle, and a temporary cache for temporarily storing the data in the on-board terminal device.
• a data classification means is provided for classifying the data into shot data and permanent cache data stored in the in-vehicle terminal device for a predetermined period.
• the data classification means classifies the data into temporary cache data temporarily stored in the vehicle-mounted terminal device and permanent cache data stored in the vehicle-mounted terminal device for a predetermined period. Temporary cache data and permanent cache data can be classified and managed.
• a data storage method includes a data classification step of classifying data into temporary cache data for temporarily storing data and permanent cache data for storage for a predetermined period, and temporary cache data storage for storing the temporary cache data.
• a permanent cache data storing step of storing the permanent cache data There is a method that
• the data is classified into temporary cache data and permanent cache data in the data classification step.
• the data storage method of the present invention has a method characterized by including a free space obtaining step of obtaining a free space of a permanent cache means for storing the permanent cache data.
• the free space of the permanent cache means for storing the permanent cache data is obtained.
• the data storage method of the present invention has a method characterized by including a data deleting step of deleting the permanent cache data stored in the permanent cache data storing step.
• the permanent cache data is deleted in the data deletion step.
• FIG. 1 is a block diagram showing a data storage system according to an embodiment of the present invention.
• FIG. 2 is a diagram showing a configuration example of content stored in the data storage system shown in FIG.
• FIG. 3 is a table showing an example of data classification information classified by the data storage system shown in FIG.
• FIG. 4 is displayed by the data storage system shown in FIG.
• FIG. 3 is a diagram illustrating an example of content.
• FIG. 5 is a flowchart showing a data classification process executed by the data storage system shown in FIG.
• FIG. 6 is a flowchart showing processing steps executed by the data storage system shown in FIG. 1 when content is requested.
• FIG. 7 is a flowchart showing a temporary cache data confirmation process executed by the data storage system shown in FIG.
• FIG. 8 is a flowchart showing data storage processing steps executed by the data storage system shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
• a data storage system 100 of the present embodiment includes an in-vehicle terminal device 101 mounted on a vehicle and data in response to a request from the in-vehicle terminal device 101. And an information center 102 that transmits the information to the information center 101.
• the vehicle terminal device 101 stores on-board terminal communication means 103 for communicating with the information center 102, temporary cache means 104 for temporarily storing data, and stores data for a predetermined period.
• Cache selecting means for selecting which of the permanent cache means 105 and the data received by the on-board terminal communication means 103 is to be stored in the temporary cache means 104 or the permanent cache means 105.
• on-board terminal control means 107 for controlling the overall operation of the on-board terminal 101
• Output means 108 for outputting sound and sound.
• the information center 102 stores information in the information center communication means 109 communicating with the in-vehicle terminal device 101, and stores data in the temporary cache means 104 and the temporary cache data and permanent cache means 105.
• Data classifying means 110 for classifying the data into permanent cache data
• data storage means 111 for storing the temporary cache data and permanent cache data classified by the data classifying means 110
• an information center Information center control means 1 1 2 for controlling the entire operation of the data cache 102, free space acquisition means 1 13 for acquiring the free space of the persistent cache means 105, and permanent cache means 1 105
• Data deleting means 114 for deleting the persistent cache data stored in the memory.
• the in-vehicle terminal device 101 and the information center 102 are connected to the Internet via the in-vehicle terminal communication means 103 and the information center communication means 109, for example.
• the information center 102 provides the content including data such as text and graphics to the in-vehicle terminal device 101 in response to a request from the in-vehicle terminal device 101.
• the content data can be obtained, for example, by connecting the information center 102 to an external content distribution device or by providing the information center 102 with a data input device. It is supposed to be done.
• the on-board terminal communication means 103 and the information center communication means 109 are, for example, _f1, TCP / IP (Transmission Control Protocol / Internet Protocol), UUCP (Unix (registered trademark) to Unix (registered trademark) Copy Protocol) and other communication protocols are used to send and receive data.
• the on-board terminal device 101 and the information center 102 are connected by an original communication protocol without using the Internet, and the May be configured to transmit and receive data.
• Reference numeral 4 includes a CPU, a RAM, a ROM, and the like.
• the temporary cache means 104 and the permanent cache means 105 are composed of, for example, a semiconductor memory, and store and read data at high speed. Further, the temporary cache means 104 is adapted to temporarily store data. Also, when storing data in the temporary cache means 104, if the storage capacity is insufficient, the in-vehicle terminal control means 107, for example, stores the data in the temporary cache means 104. The stored data is deleted in the order in which it is stored, that is, in order from the oldest data, so that the storage capacity is secured. In addition, when the power supplied to the in-vehicle terminal device 101 is cut off, the data stored in the temporary cache means 104 may be deleted. Temporarily storing data means that the data is stored during a period from when the data stored in the temporary cache unit 104 is stored until it is deleted.
• the permanent cache means 105 stores data for a predetermined period.
• the predetermined period refers to a period from when data is stored in the permanent cache unit 105 until it is overwritten, or until it is deleted by the data deletion unit 114.
• the persistent cache means 105 has a configuration in which the stored contents do not change even if the power supplied to the in-vehicle terminal device 101 is turned off.
• the output means 108 is composed of, for example, an image display unit for displaying an image and a sound output unit for outputting sound.
• the image display unit includes, for example, an image data buffer memory, an image signal processing circuit, a liquid crystal display, and the like, and displays characters, symbols, still images, moving images, and the like.
• the sound output unit includes, for example, a sound signal buffer memory, a sound signal amplifying circuit, and a spike force, and outputs sounds, music, sound effects, and the like.
• the data classification means 110 includes a temporary cache data storing the data obtained in advance by the information center 102 in the temporary cache means 104 and a permanent cache data stored in the permanent cache means 105.
• Data for example, the data classification means 110 includes an input unit such as a keyboard and a joystick, an image display unit for displaying an image, a sound output unit for outputting sound, and the like. By operating the input unit while checking the contents of the data, the operator (2) temporarily converts the data that has a high possibility of data update to temporary cache data and the one that has a low possibility of data update. The data may be classified into cache data.
• the data classification means 110 further includes a classification learning unit for learning the operation of the operator of the information center 102, and temporarily caches data and permanent cache data based on the learning result of the classification learning unit. It may be configured to be classified into and. Further, a configuration may be adopted in which data is classified into temporary cache data and permanent cache data by referring to the type of data, for example, the extension of a file constituting the data.
• the result classified by the data classification means 110 is stored in the data storage means 111 as data classification information by the data classification means 110. Has become.
• Data classification information is described, for example, Ri by the mark Akupu language such as XM L (Extensible Markup Language) ⁇ H TM L riyper Text Markup Language).
• the data storage means 111 is composed of, for example, a magnetic disk, an optical disk, a semiconductor memory, etc., and stores data classified by the data classification means 110. .
• the stored data is read out from the information center control means 112.
• URL Uniform Resource Locator
• A The content of URL (A) and the content of URL (B) include HTML document A202 and HTML document B209, respectively.
• the HTML document A202 is a style sheet A203 that specifies attributes of the HTML document A202, such as fonts, colors, backgrounds, texts, boxes, and the like, and an HTML document.
• a script tag A204 that executes processing when a button is pressed and simple arithmetic processing, and GIF image data created in GIF (Graphics Interchange Format) Indicates the link destination of A205, JPEG (Joint Photographic Coding Experts Group) JPEG image data A206, sound data A207, and URL (B) content.
• Link data 208 is included.
• the style sheet A203 for example, is described by the CSS (Cascading Style Sheets) specification
• the script tag A204 is, for example, a JavaScript script. (Java (registered trademark) Script) language.
• the HTML document B209 at the link destination of the link data 208 of the URL (B) content is the font, color, background, and text of the HTML document B209. It includes a style sheet B210 for designating attributes such as a character and a box, and GIF image data B211 created in the GIF format.
• FIG. 3 shows an example of data classification information in which each data shown in FIG. 2 is classified into temporary cache data and permanent cache data.
• data that is likely to be updated is classified as temporary cache data
• data that is unlikely to be updated is classified as permanent cache data.
• This data classification information is described in, for example, XML and stored in the data storage unit 111.
• the data that is highly likely to be updated is, for example, HTML document data whose contents are frequently rewritten.
• the data that is unlikely to be updated is, for example, button data displayed as a GIF image that advances or returns the page on which the content is displayed.
• FIG. 4 the HTML document 300 of the content “Today's News” displayed on the image display section of the output means 108 is shown, and the title of the content displayed as a GIF image 310 is shown. And the title and content of “ ⁇ News” displayed in text, 302, and a photo of a JPEG image related to “ ⁇ News” 304 and the first page of the content "TOP button” of the GIF image to be operated when returning to 305, and "Back button” of the GIF image to operate when returning to the previous page 306 and a “forward button” 307 of the GIF image operated when proceeding to the next page are displayed.
• the HTML document 300 includes a style sheet 308 and a script tag 309 (not shown).
• the style sheet 308 specifies attributes such as font, color, and text of the HTML document 300
• the script tag 309 specifies the “TO ⁇ button” 305 and “return”. It is described that an operation corresponding to each button is executed by operating the “button” 306 and the “forward button” 307.
• HTML document 300 title of “ ⁇ News” 302, content of “ ⁇ News” 303, photo of JPEG image 304, and style sheet Data 308 is data related to news that changes every moment, so there is a high possibility of data updating. Therefore, it is classified as temporary cache data.
• the title 301, the "TOP button” 300, the “back button” 300, the “forward button” 307, and the script tag 309 are not used for data that changes frequently. There is no possibility of data update. Therefore, it is classified as persistent cache data. .
• the content of the URL (A) is obtained by the information center communication means 109 (step S401). Acquisition of this content, For example, it is obtained from a content distribution device connected to the Internet.
• the data included in the acquired content of the URL (A) is classified into temporary cache data and permanent cache data by the data classification means 110 (step S402).
• step S402 the data classified as permanent cache data is added to the list of permanent cache data by the data classification means 110 (step S403), and the data is temporarily stored.
• the data classified into the cache data is added with the data name in the temporary cache data list (step S404). Then, the classified data, the list of the permanent cache data, and the list of the temporary cache data are stored by the data storage unit 111.
• the in-vehicle terminal control means 107 requests the content of URL (A) (step S501).
• a keyboard, joystick, or the like is connected to the in-vehicle terminal control means 107, and the user of this system can use the keyboard or joystick from the menu displayed on the output means 108.
• the desired content can be selected by, for example, it is possible to request the selected content.
• the data configuration of the content of the URL (A) is acquired by the in-vehicle terminal control means 107 (step S502).
• This data structure can be obtained from the information described in the HTML document A202 included in the content of the URL (A) shown in FIG. 2 described above. Since it is possible, the information of the data structure is obtained from the HTML document A 202 stored in the temporary caching means 104 or the permanent caching means 105. The information of this data configuration may be obtained from the information center 102.
• the vehicle-mounted terminal control means 107 determines whether or not the data constituting the content of the URL (A) is stored in the permanent cache means 105 (step S5). 0 3). If it is determined in step S503 that the data is stored in the persistent cache means 105, the in-vehicle terminal control means 107 sends the data from the persistent cache means 105 to the persistent cache means 105. Is read (step S504), and a temporary cache data confirmation process is performed (step S505). Then, the output means 108 outputs the data of the content of URL (A) (step S510). The temporary cache data confirmation processing will be described later.
• step S503 if it is not determined in step S503 that the data is stored in the permanent cache means 105, the onboard terminal communication means 103 is sent to the onboard terminal control means 107.
• the data of the content is requested to the information center 102 via the server (step S506).
• step S507 the content center data and the data classification information are transmitted by the information center communication means 109 (step S507), and the content data is transmitted by the on-board terminal communication means 103.
• step S508 a data storage process is executed (step S509). Then, the process proceeds to step S510 described above, and the data of the content of the URL (A) is output by the output unit 108.
• the data storage processing will be described later.
• the vehicle-mounted terminal control means 107 determines whether or not data constituting the content of the URL (A) is stored in the temporary cache means 104 (step S601). In step S601, when it is determined that the data is stored in the temporary cache means 104, the update information of the data stored in the temporary cache means 104 is confirmed ( Step S602). This update information is managed by the information center control means 112. Next, the in-vehicle terminal control means 107 determines whether or not the data stored in the temporary cache means 104 has been updated in the information center 102 based on the update information (Step S). 6 0 3). Steps
• Step S604 If it is not determined that the data stored in the temporary cache means 104 has been updated in the information center 102 at 563, the data is read from the temporary cache means 104 ( Step S604), end the temporary cache data confirmation processing.
• step S601 if it is not determined in step S601 that the data is stored in the temporary cache means 104,
• step S605 If it is determined that the data has been updated in 603, the latest data is requested by the in-vehicle terminal control means 107 (step S605). Then, the data is stored in the temporary cache means 104 by the on-board terminal control means 107 (step S660), and the temporary cache data confirmation processing ends.
• the cache selection unit 106 temporarily caches data included in the content of the URL (A) based on the received data classification information. Which of the means 104 and the permanent cache means 105 is to be stored is selected (step S701).
• step S701 the data selected to be stored in the persistent cache means 105, that is, the persistent cache data is stored in the free space acquisition means before being stored in the persistent cache means 105.
• the free space of the permanent cache means 105 is obtained (step S702).
• step S702 if the free space of the persistent cache means 105 is insufficient and the persistent cache data cannot be stored, the persistent cache means 1014 is deleted by the data deleting means 114.
• step 5 one or more permanent cache data stored in the past are deleted (step S703), and free space is secured so that new permanent cache data can be stored.
• the permanent cache data is stored in the permanent cache means 105 (step S704), and the data storage processing ends.
• the new persistent cache data may be stored by overwriting the previously stored persistent cache data with the new persistent cache data.
• step S701 the data selected to be stored in the temporary cache means 104, that is, the temporary cache data, is stored in the temporary cache means 104 (step S710). 5), end the data storage processing.
• the data processed by the data storage system 100 of the present embodiment is The data is not limited to the data of the Internet contents described above.
• step S701 described above is a data classification step
• step S702 is a free space acquisition step
• step S703 is a data deletion step
• step S704 is a permanent cache data storage step.
• Reference numeral 705 denotes a temporary cache data storage step.
• the data classifying means 110 includes the temporary cache data storing the data in the temporary cache means 104 and the permanent cache means 100.
• the persistent cache data stored in the permanent cache means 105 is output to the output means 108, the update information of the data is checked. Can be omitted, and communication time and communication cost can be reduced.
• the present invention when referring to the persistent cache data stored in the persistent cache means in the in-vehicle terminal device, it is possible to omit confirmation of the update information of the data, A data storage system that can reduce communication time and communication cost can be provided.

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• Engineering & Computer Science (AREA)
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• General Physics & Mathematics (AREA)
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• Data Mining & Analysis (AREA)
• Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
• Information Transfer Between Computers (AREA)

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• 2002
  • 2002-10-18 JP JP2002304371A patent/JP4308498B2/ja not_active Expired - Fee Related
• 2003
  • 2003-10-16 US US10/531,623 patent/US20060155438A1/en not_active Abandoned
  • 2003-10-16 WO PCT/JP2003/013290 patent/WO2004036431A1/ja not_active Ceased
  • 2003-10-16 DE DE10393533T patent/DE10393533T5/de not_active Ceased

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