Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L67/00—Network arrangements or protocols for supporting network services or applications
  • H04L67/01—Protocols
  • H04L67/10—Protocols in which an application is distributed across nodes in the network
  • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
  • H04L67/1004—Server selection for load balancing
  • H04L67/1021—Server selection for load balancing based on client or server locations
• • 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
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L67/00—Network arrangements or protocols for supporting network services or applications
  • H04L67/01—Protocols
  • H04L67/10—Protocols in which an application is distributed across nodes in the network
  • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L67/00—Network arrangements or protocols for supporting network services or applications
  • H04L67/01—Protocols
  • H04L67/10—Protocols in which an application is distributed across nodes in the network
  • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
  • H04L67/10015—Access to distributed or replicated servers, e.g. using brokers

Definitions

• TECHNICAL FIELD Procedure to buffer information in a communications system, with a system design which corresponds to, or is similar to, WWW (World Wide Web) , at which a proxy server buffers information or files.
• WWW World Wide Web
• a WW-service consists of a collection of hypertext documents which are linked to each other, and a program which can transmit these to the clients. The service can be compared to a catalogue or a newspaper, but with built-in links to other information sources. But unlike a printed catalogue, a WWW-service also can be interactive - it can offer possibilities to search information, transmit messages and to order material directly over the network.
• HTTP - Hypertext Transfer Protocol The protocol which is used when the WWW-document is executed over the network is called HTTP - Hypertext Transfer Protocol .
• HTML-documents server side includes, only NCSA. Act as proxy server and buffer files.
• a WWW-server which operates as a so called proxy server normally receives HTTP-calls from clients in a local network, and forwards them to the external end destination.
• the proxy server When the documents then are delivered from the network, the proxy server receives the document, buffers it in its cache, and finally transmits it to the client program. This will be done for all HTTP-calls for the client programs which have set up the server as their proxy server.
• a proxy server is usually run in a so called fire wall computer which constitutes a barrier between a local network and Internet .
• the buffering of documents in the cache memory of the server will have the good effect that a lot of documents can be collected directly from the cache of the server, without the need of loading the network.
• this method of storing is not very well thought- out and efficient, because the system only to a limited extent is adapted to simple terminals and lower bandwidths, as, for instance, at transmission of information via modem or ISDN.
• FIGURES Figure 1 illustrates the principle of a known solution for WW.
• Figure 2 illustrates a part of a network architecture according to the invention.
• MIME Multipurpose Internet Mail Extension A standard for i.a. transmission of appendices to e-mail.
• FIG. 2 illustrates a network architecture for efficient buffering in World Wide Web according to the invention.
• Figure 2 illustrates a network architecture for efficient buffering in World Wide Web according to the invention.
• the Figure is shown diagramatically division of the buffering in different proxy levels and the denomination of the different buffering places (proxies) where buffering is done and which are described in the following.
• Home Proxy is placed in a physical server which the system has identified as optimal to a certain user.
• a user who normally connects from the same geographical place will, by the system, be allocated the nearest server for Home Proxy. If a user changes his/her access-pattern (for instance at travelling or permanent removal), the system will, after a certain time, change the allocation of Home Proxy for this user. At most accesses Home Proxy therefore will be the same server as Access Proxy.
• the cache of this server often will contain requested web-material, i.e. "hit rate" for the cache function in Home Proxy will be high.
• Home Proxy selects for each HTTP-access whether the material shall be collected directly from the original web server, or if it shall be collected via the specialised
• Certain web-material need to be adapted to different bandwidths, different types of terminals, or according to the wishes of the user.
• Example of this is graphic material (for instance the MIME-types image/gif and image / 'jpeg) , the bandwidth need of which is heavily reduced by reducing the resolution concerning colour and pixels.
• presentation elements as, for instance, video, are adapted to otherwise insufficient bandwidths and terminals.
• MIME Proxy being specialised to manage specific MIME-types, it will be equipped with special software or hardware to adapt just this type of information without larger delays arising. Scalability for these MIME-types is an important part to offer adapted Quality of Service (QoS) .
• QoS Quality of Service
• Certain sites in World Wide Web are more popular than others.
• certain proxy servers being responsible for buffering information from a certain name domain (for instance ibm . com) which is not handled by MIME Proxy, for instance software or text, better storing efficiency is achieved than if all proxy servers buffer this information.
• a Home Proxy knows which Site Proxies that handles different name domains. By the system knowing which proxy server/servers that caches information from a certain name domain, it will be possible to make programmed updating of the material by means of so called PUSH-technology .
• the third level is the public Internet. This level is used if the wanted information does not exist in the system, or if an updating has been made on the original web server. Owners of popular web- sites can offer information channels by which updatings are transmitted regularly (a number of times per twenty-four hours) . In that way is avoided that all readers must go to the original web server to get the most updated information. A so called Push Tuner is used to refill a Site Proxy with updated information.

Landscapes

• Engineering & Computer Science (AREA)
• Databases & Information Systems (AREA)
• Theoretical Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Data Mining & Analysis (AREA)
• Physics & Mathematics (AREA)
• General Engineering & Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Computer And Data Communications (AREA)
• Information Transfer Between Computers (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

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Family Applications (1)

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• 1998
  • 1998-01-19 SE SE9800155A patent/SE522316C2/sv unknown
• 1999
  • 1999-01-18 WO PCT/SE1999/000058 patent/WO1999036865A1/en not_active Ceased
  • 1999-01-18 EP EP99902953A patent/EP1051684A1/de not_active Withdrawn
• 2000
  • 2000-07-13 NO NO20003592A patent/NO319667B1/no not_active IP Right Cessation

Non-Patent Citations (1)

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