WO2001067296A2 - Computer network - Google Patents

Computer network Download PDF

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Publication number
WO2001067296A2
WO2001067296A2 PCT/GB2001/000947 GB0100947W WO0167296A2 WO 2001067296 A2 WO2001067296 A2 WO 2001067296A2 GB 0100947 W GB0100947 W GB 0100947W WO 0167296 A2 WO0167296 A2 WO 0167296A2
Authority
WO
WIPO (PCT)
Prior art keywords
data
server
request
client
transmitted
Prior art date
Application number
PCT/GB2001/000947
Other languages
French (fr)
Other versions
WO2001067296A3 (en
Inventor
Richard Byron Theo
Mark Samuel Edwards
Original Assignee
Avantis Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Avantis Limited filed Critical Avantis Limited
Priority to AU35865/01A priority Critical patent/AU3586501A/en
Publication of WO2001067296A2 publication Critical patent/WO2001067296A2/en
Publication of WO2001067296A3 publication Critical patent/WO2001067296A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1859—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast adapted to provide push services, e.g. data channels
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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 computer network arranged to reduce the amount of data traffic therein.
  • One application of such a network is in a classroom environment in which a plurality of pupils are each provided with access to data stored on a server via a respective computer workstation (client) .
  • a teacher may instruct the pupils to download specific data files, such as images, from the server.
  • the server might therefore be required to transmit the same file, at approximately the same time, to many workstations, thereby significantly increasing the amount of data that must be transmitted via the common communication channel .
  • the number of workstations in the network must be limited to the maximum number of workstations that can be satisfactorily serviced by the server at any one time, which is ultimately limited by the bandwidth of the common communication channel via which data from the server is transmitted.
  • a computer network arranged such that data transmitted by a server via a communication channel shared with a plurality of clients, in response to a data request originating from one of the clients, will be stored in a respective memory cache of each client, and such that each client will request data from the server only if that data is not already stored in its respective memory cache.
  • the overall amount of data traffic in the network is substantially reduced.
  • the maximum number of workstations that may satisfactorily be serviced by the server is therefore substantially increased.
  • the overall speed of the network will be substantially increased.
  • the data transmitted by the server comprises both the data requested and additional data.
  • the additional data preferably comprises data stored by the server in succession with the requested data.
  • the additional data might comprise any data considered likely to be required subsequent to the requested data.
  • the network is arranged such that said data is transmitted as a multicast data transmission (as will be described in more detail hereinbelow) .
  • the requested data is preferably then transmitted or re-transmitted to the client from which the data request originated, in an appropriate form to satisfy the data request, to complete the data transmission cycle.
  • the multicast data transmission comprises additional data to that requested, it will be appreciated that this arrangement avoids the situation of a client issuing successive data requests, if the data of the second request is in the process of being transmitted as part of the multicast data transmission.
  • the communication channel may be provided, for example, by an electrical, optical or radio- frequency link.
  • a computer program arranged to operate a computer network such that data transmitted by a server via a communication channel shared with a plurality of clients, in response to a data request originating from one of the clients, will be stored in a respective memory cache of each client, and such that each client will request data from the server only if that data is not already stored in its respective memory cache .
  • a server arranged to communicate with a plurality of clients via a communication channel and to respond to a data request originating from one of the clients by transmitting data as a multicast data transmission and subsequently transmitting or re-transmitting the requested data to the client from which the data request originated, in an appropriate form to satisfy the data request, to complete the data transmission cycle.
  • the data transmitted by the server as a multicast data transmission comprises both the data requested and additional data.
  • the additional data comprises data stored by the server in succession with the requested data.
  • a computer program arranged to operate a server such that the server communicates with a plurality of clients via a communication channel and responds to a data request originating from one of the clients by transmitting data as a multicast data transmission and subsequently transmitting or re-transmitting the requested data to the client from which the data request originated, in an appropriate form to satisfy the data request, to complete the data transmission cycle.
  • a client comprising a cache memory and arranged to request data from a server via a communication channel, only if that data is not already stored in said memory cache, and to then receive data transmitted as a multicast data transmission by the server and store the received data in said memory cache .
  • the data transmitted by the server as a multicast data transmission comprises both the data requested and additional data.
  • the client is further arranged to receive from the server, subsequent to the multicast data transmission, a transmission or re-transmission of the requested data, in an appropriate form to satisfy the data request, to complete the data transmission cycle.
  • a computer program arranged to operate a client comprising a cache memory to request data from a server via a communication channel, only if that data is not already stored in said memory cache, and to then receive data transmitted as a multicast data transmission by the server and store the received data in said memory cache.
  • Figure 1 is a schematic illustration of a computer network in accordance with the present invention.
  • FIG. 2 is a schematic illustration of the processing elements of the server of Figure 1 ;
  • FIG 3 is a schematic illustration of the processing elements of a corresponding client interface
  • Each client 4 comprises a respective memory cache and is arranged to transmit a data request to the server 2 only in the event that a required item of data is not already stored in that cache.
  • the server 2 In response to a data request from one or other of the clients 4 not having a required item of data in its respective memory cache, the server 2 first transmits both the requested item of data together with additional items of data as a multicast data transmission via the common communication channel i.e. as a stream of digital data incorporating a coded identifier enabling pre-determined clients to identify and store that data in their respective memory caches.
  • FIG. 2 shows, schematically, the various processing elements of a server architecture for implementing the above network, with narrow lines indicating data requests and broad lines indicating the flow of data between elements.
  • a data request received via a communication channel 8 by a network interface 10 is passed to a network re-director 12 which decodes the request.
  • the decoded request would be transmitted (as indicated by the thin dashed line in Figure 2) as an internal data request to a file store 14, with the data returned from the file store being passed back via the network re-director 12 and the network interface 10 to be transmitted to the client from which the data request originated.
  • the decoded request is instead transmitted as an internal data request from the network re-director 12 to the file store via an intermediate processing element 16 which supplements the internal data request with a request for additional data.
  • the data returned from the file store 14 comprises both the data requested by the client and additional data as determined by the intermediate processing element 16, both data being passed to a coding element 18 which translates the data into an appropriate form for multicast transmission to selected clients, via the network interface 10.
  • the data requested by the client is subsequently transmitted via the network re-director 12 and network interface 10, in a conventional manner, to the client from which the data request originated.
  • the thin dashed line in Figure 3 indicates how, in a conventional system, a data request from an external module (not shown) is transmitted to the server via a network re- director 20 and network interface 22, with the requested data being passed back to the external module via the network interface 22 and network re-director 20.
  • a network request from an external module is instead passed to an intermediate processing element 24 which transmits an internal data request to a memory cache 26. If the memory cache 26 contains the required data then that data is passed back to the external module. If not, then the intermediate processing element 24 transmits the data request to the server via the network re- director 20 and network interface 22, with the requested data being passed back to the external module via the network interface 22 and network re-director 20.
  • the client interface of Figure 3 also comprises a processing element 28 which continually monitors the data transmitted by the server via the common communication channel 6 and, where that data is multicast data of an appropriate identity, stores the multicast data in its memory cache 26.
  • the embodiment described with reference to the drawings comprises computer apparatus and processes performed in computer apparatus
  • the invention also extends to computer programs, particularly computer programs on or in a carrier, adapted for putting the invention into practice.
  • the program may be in the form of source code, object code, a code intermediate source and object code such as in partially compiled form, or in any other form suitable for use in the implementation of the processes according to the invention.
  • the carrier be any entity or device capable of carrying the program.
  • the carrier may comprise a storage medium, such as a ROM, for example a CD ROM or a semiconductor ROM, or a magnetic recording medium, for example a floppy disc or hard disk.
  • a storage medium such as a ROM, for example a CD ROM or a semiconductor ROM, or a magnetic recording medium, for example a floppy disc or hard disk.
  • the carrier may be a transmissible carrier such as an electrical or optical signal which may be convey via electrical or optical cable or by radio or other means.
  • the carrier may be constituted by such cable or other device or means .
  • the carrier may be an integrated circuit in which the program is embedded, the integrated circuit being adapted for performing, or for use in the performance of, the relevant processes.
  • the computer network thus described will allow a greater number of clients to be accommodated than would otherwise be possible using a conventional network.

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  • 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)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

A computer network arranged such that data transmitted by a server (2) via a communication channel (6) shared with a plurality of clients (4), in response to a data request originating from one of the clients (4), will be stored in a respective memory cache of each client (4), and such that each client (4) will request data from the server only if that data is not already stored in its respective memory cache. Thus, where a number of clients require the same data at approximately the same time, such as in a classroom scenario, the overall amount of data traffic in the network is substantially reduced.

Description

Computer Network
The present invention relates to a computer network arranged to reduce the amount of data traffic therein.
It has long been known to provide a computer network in which one computer, known as a "server", is arranged to transmit data via a common communication channel to one of a plurality of other computers, known as "clients".
One application of such a network is in a classroom environment in which a plurality of pupils are each provided with access to data stored on a server via a respective computer workstation (client) .
Periodically, throughout the course of a lesson, a teacher may instruct the pupils to download specific data files, such as images, from the server.
The server might therefore be required to transmit the same file, at approximately the same time, to many workstations, thereby significantly increasing the amount of data that must be transmitted via the common communication channel .
It will be appreciated that to accommodate such a situation, the number of workstations in the network must be limited to the maximum number of workstations that can be satisfactorily serviced by the server at any one time, which is ultimately limited by the bandwidth of the common communication channel via which data from the server is transmitted.
We have now devised an arrangement which allows a server to provide data to an increased number of clients.
According to a first aspect of the present invention, there is provided a computer network arranged such that data transmitted by a server via a communication channel shared with a plurality of clients, in response to a data request originating from one of the clients, will be stored in a respective memory cache of each client, and such that each client will request data from the server only if that data is not already stored in its respective memory cache.
Thus, where a number of clients require the same data at approximately the same time, such as in the classroom scenario described above, the overall amount of data traffic in the network is substantially reduced. The maximum number of workstations that may satisfactorily be serviced by the server is therefore substantially increased.
Also, as the time required for a client to access data from its respective memory cache will typically be far less than that required to obtain the same data from the server, the overall speed of the network will be substantially increased.
Preferably the data transmitted by the server comprises both the data requested and additional data. It has been found that in many circumstances there is an increased likelihood of successive data requests being for respective items of data stored consecutively by the server, and therefore the additional data preferably comprises data stored by the server in succession with the requested data. However, it will be appreciated that the additional data might comprise any data considered likely to be required subsequent to the requested data.
Preferably the network is arranged such that said data is transmitted as a multicast data transmission (as will be described in more detail hereinbelow) . In this case, the requested data is preferably then transmitted or re-transmitted to the client from which the data request originated, in an appropriate form to satisfy the data request, to complete the data transmission cycle. Where the multicast data transmission comprises additional data to that requested, it will be appreciated that this arrangement avoids the situation of a client issuing successive data requests, if the data of the second request is in the process of being transmitted as part of the multicast data transmission.
The communication channel may be provided, for example, by an electrical, optical or radio- frequency link. According to a second aspect of the present invention, there is provided a computer program arranged to operate a computer network such that data transmitted by a server via a communication channel shared with a plurality of clients, in response to a data request originating from one of the clients, will be stored in a respective memory cache of each client, and such that each client will request data from the server only if that data is not already stored in its respective memory cache . According to a third aspect of the present invention, there is provided a server arranged to communicate with a plurality of clients via a communication channel and to respond to a data request originating from one of the clients by transmitting data as a multicast data transmission and subsequently transmitting or re-transmitting the requested data to the client from which the data request originated, in an appropriate form to satisfy the data request, to complete the data transmission cycle.
Preferably the data transmitted by the server as a multicast data transmission comprises both the data requested and additional data. Preferably the additional data comprises data stored by the server in succession with the requested data.
According to a fourth aspect of the present invention, there is provided a computer program arranged to operate a server such that the server communicates with a plurality of clients via a communication channel and responds to a data request originating from one of the clients by transmitting data as a multicast data transmission and subsequently transmitting or re-transmitting the requested data to the client from which the data request originated, in an appropriate form to satisfy the data request, to complete the data transmission cycle.
According to a fifth aspect of the present invention, there is provided a client comprising a cache memory and arranged to request data from a server via a communication channel, only if that data is not already stored in said memory cache, and to then receive data transmitted as a multicast data transmission by the server and store the received data in said memory cache .
Preferably the data transmitted by the server as a multicast data transmission comprises both the data requested and additional data.
Preferably the client is further arranged to receive from the server, subsequent to the multicast data transmission, a transmission or re-transmission of the requested data, in an appropriate form to satisfy the data request, to complete the data transmission cycle.
According to a sixth aspect of the present invention, there is provided a computer program arranged to operate a client comprising a cache memory to request data from a server via a communication channel, only if that data is not already stored in said memory cache, and to then receive data transmitted as a multicast data transmission by the server and store the received data in said memory cache.
An embodiment of the present invention will now be described by way of an example only and with reference to the accompanying drawings, in which:
Figure 1 is a schematic illustration of a computer network in accordance with the present invention;
Figure 2 is a schematic illustration of the processing elements of the server of Figure 1 ; and
Figure 3 is a schematic illustration of the processing elements of a corresponding client interface; Referring to Figure 1 of the drawings, a computer network is shown comprising a server 2 and a plurality of clients 4, each connected to the server via a common communication channel 6.
Each client 4 comprises a respective memory cache and is arranged to transmit a data request to the server 2 only in the event that a required item of data is not already stored in that cache.
In response to a data request from one or other of the clients 4 not having a required item of data in its respective memory cache, the server 2 first transmits both the requested item of data together with additional items of data as a multicast data transmission via the common communication channel i.e. as a stream of digital data incorporating a coded identifier enabling pre-determined clients to identify and store that data in their respective memory caches.
The server then re-transmits the requested data to the client from which the data request originated, in a manner appropriate to satisfy the data request, to complete the data transmission cycle. Figure 2 shows, schematically, the various processing elements of a server architecture for implementing the above network, with narrow lines indicating data requests and broad lines indicating the flow of data between elements.
With reference to Figure 2, a data request received via a communication channel 8 by a network interface 10 is passed to a network re-director 12 which decodes the request.
In a conventional system, the decoded request would be transmitted (as indicated by the thin dashed line in Figure 2) as an internal data request to a file store 14, with the data returned from the file store being passed back via the network re-director 12 and the network interface 10 to be transmitted to the client from which the data request originated.
According to the present invention, the decoded request is instead transmitted as an internal data request from the network re-director 12 to the file store via an intermediate processing element 16 which supplements the internal data request with a request for additional data.
The data returned from the file store 14 comprises both the data requested by the client and additional data as determined by the intermediate processing element 16, both data being passed to a coding element 18 which translates the data into an appropriate form for multicast transmission to selected clients, via the network interface 10.
The data requested by the client is subsequently transmitted via the network re-director 12 and network interface 10, in a conventional manner, to the client from which the data request originated.
The thin dashed line in Figure 3 indicates how, in a conventional system, a data request from an external module (not shown) is transmitted to the server via a network re- director 20 and network interface 22, with the requested data being passed back to the external module via the network interface 22 and network re-director 20.
According to the present invention, a network request from an external module is instead passed to an intermediate processing element 24 which transmits an internal data request to a memory cache 26. If the memory cache 26 contains the required data then that data is passed back to the external module. If not, then the intermediate processing element 24 transmits the data request to the server via the network re- director 20 and network interface 22, with the requested data being passed back to the external module via the network interface 22 and network re-director 20.
As explained above, data is transmitted by the server either as a multicast data transmission or to satisfy the data request of a specific client. The client interface of Figure 3 also comprises a processing element 28 which continually monitors the data transmitted by the server via the common communication channel 6 and, where that data is multicast data of an appropriate identity, stores the multicast data in its memory cache 26.
Although the embodiment described with reference to the drawings comprises computer apparatus and processes performed in computer apparatus, the invention also extends to computer programs, particularly computer programs on or in a carrier, adapted for putting the invention into practice. The program may be in the form of source code, object code, a code intermediate source and object code such as in partially compiled form, or in any other form suitable for use in the implementation of the processes according to the invention. The carrier be any entity or device capable of carrying the program.
For example, the carrier may comprise a storage medium, such as a ROM, for example a CD ROM or a semiconductor ROM, or a magnetic recording medium, for example a floppy disc or hard disk. Further, the carrier may be a transmissible carrier such as an electrical or optical signal which may be convey via electrical or optical cable or by radio or other means.
When the program is embodied in a signal which may be conveyed directly by a cable or other device or means, the carrier may be constituted by such cable or other device or means .
Alternatively, the carrier may be an integrated circuit in which the program is embedded, the integrated circuit being adapted for performing, or for use in the performance of, the relevant processes.
The computer network thus described will allow a greater number of clients to be accommodated than would otherwise be possible using a conventional network.

Claims

Claims .
1) A computer network arranged such that data transmitted by a server via a communication channel shared with a plurality of clients, in response to a data request originating from one of the clients, will be stored in a respective memory cache of each client, and such that each client will request data from the server only if that data is not already stored in its respective memory cache.
2) A computer network as claimed in Claim 1, wherein the data transmitted by the server, in response to the data request, comprises both the data requested and additional data.
3) A computer network as claimed in Claim 2, wherein the additional data comprises data stored by the server in succession with the requested data.
4) A computer network as claimed in any preceding claim, wherein the data transmitted by the server, in response to the data request, is transmitted as a multicast data transmission.
5) A computer network as claimed in Claim 4, wherein, subsequent to the multicast data transmission, the requested data is transmitted or re-transmitted to the client from which the data request originated, in an appropriate form to satisfy the data request, to complete the data transmission cycle.
6) A computer program arranged to operate a computer network such that data transmitted by a server via a communication channel shared with a plurality of clients, in response to a data request originating from one of the clients, will be stored in a respective memory cache of each client, and such that each client will request data from the server only if that data is not already stored in its respective memory cache ,
7) A server arranged to communicate with a plurality of clients via a communication channel and to respond to a data request originating from one of the clients by transmitting data as a multicast data transmission and subsequently transmitting or re-transmitting the requested data to the client from which the data request originated, in an appropriate form to satisfy the data request, to complete the data transmission cycle.
8) A server as claimed in Claim 7, wherein the data transmitted by the server as a multicast data transmission comprises both the data requested and additional data.
9) A server as claimed in Claim 8, wherein the additional data comprises data stored by the server in succession with the requested data.
10) A computer program arranged to operate a server such that the server communicates with a plurality of clients via a communication channel and responds to a data request originating from one of the clients by transmitting data as a multicast data transmission and subsequently transmitting or re-transmitting the requested data to the client from which the data request originated, in an appropriate form to satisfy the data request, to complete the data transmission cycle.
11) A client comprising a memory cache and arranged to request data from a server via a communication channel, only if that data is not already stored in said memory cache, and to then receive data transmitted as a multicast data transmission by the server and store the received data in said memory cache . 12) A client as claimed in Claim 11, wherein the data transmitted by the server as a multicast data transmission comprises both the data requested and additional data.
13) A client as claimed in Claim 11 or Claim 12, arranged to receive from the server, subsequent to the multicast data transmission, a transmission or re-transmission of the requested data, in an appropriate form to satisfy the data request, to complete the data transmission cycle.
14) A computer program arranged to operate a client comprising a memory cache to request data from a server via a communication channel, only if that data is not already stored in said memory cache, and to then receive data transmitted as a multicast data transmission by the server and store the received data in said memory cache .
PCT/GB2001/000947 2000-03-09 2001-03-05 Computer network WO2001067296A2 (en)

Priority Applications (1)

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AU35865/01A AU3586501A (en) 2000-03-09 2001-03-05 Computer network

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GBGB0005653.1A GB0005653D0 (en) 2000-03-09 2000-03-09 Computer network
GB0005653.1 2000-03-09

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WO2001067296A3 WO2001067296A3 (en) 2004-01-22

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EP1502198A1 (en) * 2002-05-06 2005-02-02 Nokia Corporation A content delivery architecture for mobile acces
EP1502198A4 (en) * 2002-05-06 2005-06-15 Nokia Corp A content delivery architecture for mobile acces
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GB2392518A (en) * 2002-09-02 2004-03-03 3Com Corp Computer network
GB2392518B (en) * 2002-09-02 2004-09-22 3Com Corp Computer network and method of operating same to preload content of selected web pages
US7613771B2 (en) 2002-09-02 2009-11-03 3Com Corporation Computer network and method of operating same to preload content of selected web pages
US8510408B2 (en) 2002-09-02 2013-08-13 Hewlett-Packard Development Company, L.P. Computer network and method of operating same to preload content of selected web pages

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GB2367393A (en) 2002-04-03
GB0005653D0 (en) 2000-05-03
WO2001067296A3 (en) 2004-01-22
GB0105410D0 (en) 2001-04-25
AU3586501A (en) 2001-09-17

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