WO2003032200A1 - Systeme et procede pour gerer un echange entre un serveur passerelle et un module cote client - Google Patents

Systeme et procede pour gerer un echange entre un serveur passerelle et un module cote client Download PDF

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Publication number
WO2003032200A1
WO2003032200A1 PCT/US2002/031906 US0231906W WO03032200A1 WO 2003032200 A1 WO2003032200 A1 WO 2003032200A1 US 0231906 W US0231906 W US 0231906W WO 03032200 A1 WO03032200 A1 WO 03032200A1
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WO
WIPO (PCT)
Prior art keywords
data
data objects
list
pep
client
Prior art date
Application number
PCT/US2002/031906
Other languages
English (en)
Inventor
Jeffrey Charles Weaver
Andrew Wilson Sundelin
Thomas Evans Moore
Original Assignee
Wildblue Communications, Inc.
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
Priority claimed from US09/974,664 external-priority patent/US20030069925A1/en
Priority claimed from US09/974,665 external-priority patent/US20030069926A1/en
Application filed by Wildblue Communications, Inc. filed Critical Wildblue Communications, Inc.
Publication of WO2003032200A1 publication Critical patent/WO2003032200A1/fr

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Classifications

    • 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 systems and methods for delivery of data.
  • the present invention relates to a system and method for reducing the impact of high latency links over satellite and wireless systems.
  • BACKGROUND OF THE INVENTION With the increasing demand for high-speed access to the Internet, Internet service providers and Internet users are increasingly turning to satellite networks. These satellite networks have the potential to offer significant coverage improvements over traditional, broadband terrestrial networks. Additionally, satellite networks allow for connections to the Internet to be established without the expense of laying an extensive network of terrestrial lines.
  • TCP/IP Transmission Control Protocol
  • PCT patent application WO9847166 entitled “Data Communication Protocol.
  • a system and method for reducing the impact of high latency links, whether satellite links or wireless links are disclosed. Briefly, this embodiment of the present invention reduces the impact of high latency satellite and wireless links by performing predictive prefetching and pushing of data objects needed by a user. Other embodiments are also described herein.
  • a user through a web browser—initially requests a web page.
  • This request is passed to a client PEP (performance enhancing proxy) that is often incorporated with the user's satellite modem.
  • the client PEP then passes this request through the satellite network to the gateway PEP, which then passes the request to an origin server.
  • the origin server Responsive to receiving the request, the origin server generates an index page (also called a container page) associated with the requested web page and passes that index page to the gateway PEP, which parses the index page to identify the objects listed therein.
  • the gateway PEP generates the requests to fetch, i.e., prefetch, those identified objects and passes those requests to the origin server.
  • the origin PEP can also pass the index page and a list of those objects being prefetched to the client PEP.
  • the client PEP can then pass at least the index page to the user.
  • the user once the user receives the index page, it generates a fetch request for each-or at least some of-the objects identified therein.
  • these fetch requests would normally be passed through the satellite network to the origin server.
  • the fetch requests, or at least some portion thereof can be blocked, i.e., not passed to the origin server, by the client PEP because the client PEP knows that certain fetch requests are already being filled through the requests previously passed from the gateway PEP to the origin server.
  • the gateway PEP assumes that all embedded objects are needed by the client PEP. In alternate embodiments, however, the gateway PEP can be made aware of the prior activities of the client PEP and prefetch or push only those objects not already cached by the client PEP. In either of these embodiments, however, when the origin server returns prefetched objects, these objects are passed through the satellite network to the client PEP and on to the user. From the user's perspective, the objects were received as a result of the fetch requests that the user originated. In reality, however, the objects could have been requested long before the user's browser even generated those fetch requests. In some cases, the objects may be in the process of being transmitted to the client PEP even before the user receives the index page. Thus, the present invention can, among other things, minimize the impact of the high latency between the gateway satellite dish and the local satellite dish is minimized. BRIEF DESCRIPTION OF THE DRAWINGS
  • FIGURE 1 is a present satellite network system connecting a user with the Internet
  • FIGURE 2 is a satellite network system constructed in accordance with one embodiment of the present invention
  • FIGURE 3 is an alternate embodiment of a satellite network system constructed in accordance with one embodiment of the present invention
  • FIGURE 4 is an embodiment of a wireless network system constructed in accordance with the principles of the present invention.
  • FIGURE 5 is a data flow diagram illustrating the data flow between the components of the system shown in FIGURE 2;
  • FIGURE 6 is a data flow diagram illustrating an alternate data flow between the components of the system shown in FIGURE 2;
  • FIGURE 7 is a data flow diagram illustrating a bandwidth optimization technique in accordance with one embodiment of the present invention.
  • FIGURE 1 there is illustrated a present satellite network system 100 connecting a user 125 with the Internet 1 15.
  • the user 125 is connected to a satellite modem 130 and a local satellite dish 1 10.
  • the user 125 receives data— in some cases both Internet and TV— from a gateway satellite dish 105 via a geostationary satellite 135.
  • the local satellite dish 110, the geostationary satellite 135 and the gateway satellite dish 105 are referred to as the "satellite system.”
  • the data that the gateway satellite dish 105 transmits to the user 125 can originate from the Internet 115 and origin server 101 or a broadcast system (not shown).
  • the SMTS (Satellite Modem Termination System) 120 provides the necessary intelligence to bridge between the Internet 115 and the satellite system.
  • This general configuration shown in FIGURE 1 is similar to the system used for modern satellite TV systems.
  • HughesTM Network Systems offers a combination satellite TV system and Internet access (called “DirecDuo”TM) using this general system.
  • FIGURE 1 there is illustrated a satellite network system 140 constructed in accordance with the principles of the present invention.
  • this system includes a gateway satellite dish 105, a local satellite dish 110, and a geostationary satellite 135.
  • this embodiment of the present invention includes a gateway PEP (Performance Enhancing Proxy) 145, a client PEP 150 and a gateway cache 155.
  • PEP Performance Enhancing Proxy
  • the client PEP 150 is shown separately from the satellite modem 130 and the user 125, in other embodiments, the client PEP 150 could be integrated into the satellite modem 130 and/or into the user's computer.
  • the client PEP 150 could be a browser plug-in or otherwise incorporated with the user's browser application.
  • the gateway PEP 145 and the client PEP 150 can replace or supplement traditional data transmission protocols, e.g., TCP/IP and HTTP, with a transport protocol that is optimized for a satellite network.
  • the protocol between the Internet 1 15 and the gateway PEP 145 could be TCP/IP and the protocol between the client PEP 150 and the user 125 could be TCP/IP.
  • the protocol between the gateway satellite dish 105 and the local satellite dish 150 could be a satellite transport protocol instead of standard TCP/IP.
  • the PEP can speak standard Internet protocols on one interface and satellite protocols on a different interface.
  • the satellite transport protocol could replace traditional HTTP with an enhanced protocol.
  • interactive applications e.g., web browsing, can better utilize the downloading capacity of a satellite network and thereby make interactive applications faster, more efficient and commercially viable.
  • FIG. 3 illustrates an alternate embodiment of a satellite network system 160 constructed in accordance with the principles of the present invention.
  • a client-side cache 165 and distribution service 170 are disposed intermediate the local satellite dish 110 and the individual users 125.
  • the distribution service 170 could be a MMDS (Multichannel Multipoint Distribution System), a LMDS (Local Multipoint Distribution System), or any other type of distribution service.
  • MMDS Multichannel Multipoint Distribution System
  • LMDS Local Multipoint Distribution System
  • FIGURE 3 The operation of the system illustrated in FIGURE 3 is similar to the operation of the system shown in FIGURE 2.
  • the client PEP 150 can be modified to interact with multiple users 125 rather than a single user. Additionally, the client PEP 150 could be modified to take advantage of a client-side cache 165, which could be resident in the same device as the PEP, thereby offering the PEP the advantages of local storage.
  • FIGURE 4 there is illustrated an embodiment of a wireless network system 175 constructed in accordance with the principles of the present invention.
  • the gateway PEP 145 is disposed between the Internet 115 and a wireless broadcast device 180.
  • the gateway PEP 145 could enhance or modify the transmission protocols used by the wireless broadcast device 180 and thereby provide optimizations similar to those achieved in the previously-described satellite network systems.
  • the user 125 could be any type of wireless-adapted device ranging from a PDA to a cell phone to a wireless-connected mobile computer.
  • the user 125 would incorporate a client PEP or at least portions of a PEP.
  • the user could include storage for storing data used by the client PEP.
  • the operation of the present invention is best illustrated by example. Although the following examples involve an Internet application, one skilled in the art can recognize that the present invention can be applied to other types of interactive applications. Moreover, the following examples recite the execution of events in a particular order. The order of these events is exemplary only, and the present invention is not necessarily limited to the recited order.
  • FIGURE 5 illustrates the data flow between the components of the system shown in FIGURE 2.
  • the user through a browser, sends a request to the client PEP (step 185).
  • the client PEP would then pass this request-through the satellite system— to the gateway PEP (step 190), which would then pass the request to an Internet-connected (or other network) origin server (step 195).
  • the origin server would return an index page to the gateway PEP (step 200).
  • the gateway PEP would then parse the index page (step 205) to identify the objects within the page, generate a prefetch list (step 205), and attempt to prefetch the objects included in the prefetch list (step 230).
  • the gateway PEP next sends the index page and a list of the objects being prefetched to the client PEP (step 210).
  • the client PEP passes the index page to the user (step 215) and in certain embodiments, the client PEP also passes the list of objects being prefetched to the user (step 215).
  • the user upon receiving the index page, the user generates GET requests for the objects identified in the index page and passes those requests to the client PEP (step 220). Because the client PEP has been told by the gateway PEP which objects that the gateway PEP is prefetching on its behalf (via the object list), the client PEP knows what objects may already be in transit from the gateway PEP. If the client PEP receives GET requests from the user's browser for objects on the object list, the client PEP blocks the requests (step 225), i.e., does not forward the requests, because it is already anticipating delivery of these objects. The user, however, does not necessarily know that the fetch requests have been blocked.
  • the gateway PEP requests the index page objects from the origin server (step 230).
  • the origin server sends the requested objects to the gateway PEP (step 235), and the gateway PEP passes those objects to the client PEP (step 240).
  • the retrieved objects can be passed to the user (step 245) so that the user can assemble the objects and display the requested web page.
  • the above-described method presents a significant improvement over existing technology.
  • the above- described method minimizes the impact of high latency links in satellite and wireless networks by, for example, minimizing the number of round trip interacts necessary to retrieve data.
  • this implementation may anticipate the needs of the user, fetch those objects before the user actually requests them and push them to the user/client PEP.
  • the high latency link is generally higher latency than typical Internet latency to the origin server, these objects can often be pushed before the index page has even arrived at the end user.
  • objects needed by a user may be in transit to the user before the user even requests them. If the objects are not needed, the client PEP can merely discard them or store them locally for future use.
  • one embodiment of the present invention incorporates existing browser technology.
  • the user's browser does not necessarily need to be modified to benefit from the present invention.
  • the browser generates the same requests that it would in a normal system.
  • the client PEP intercepts these requests and blocks them if appropriate.
  • the advantage of this embodiment of the invention's use of existing technology at the end points can be enhanced when the addition of advance technologies such as multicast are added into the system.
  • the gateway PEP and client PEP can utilize mulitcast between them generally without any changes to the origin server or browser.
  • the gateway PEP could track popular content and mulitcast content responses for these URLs.
  • subscribers could indicate interest groups and when requests are made for content in those interest groups, the responses are mulitcast to the group, not just unicast to the requestor.
  • the advantage of this approach is that the same amount of bandwidth can be consumed by unicast traffic as by multicast traffic and, by doing this with the PEPs, the activity is transparent to the end points.
  • FIGURE 6 is a data flow diagram illustrating an alternate data flow between the components of FIGURE 2.
  • steps 185-245 of FIGURE 6 are similar to the correspondingly numbered steps in FIGURE 5.
  • certain objects were not subjected to a prefetch in step 230 and not provided to the user in step 245.
  • the client PEP passes requests for these non-prefetched objects to the gateway PEP (step 250).
  • the gateway PEP then passes the requests to the origin server (step 255).
  • the origin server can then retrieve the objects corresponding to the request and transmit those objects to the gateway PEP (step 260).
  • the gateway PEP can then pass the objects to the client PEP (265), and finally, the client PEP can pass the objects to the user (step 270) for combination with the objects received in step 245.
  • FIGURE 7 it is a data flow diagram illustrating a method of optimizing bandwidth in accordance with one embodiment of the present invention.
  • the user initially passes a request, e.g., get cnn.com, to the client PEP (step 185).
  • the client PEP intercepts this request and determines if the request— or a portion of the request— has been previously filled (step 280).
  • the client PEP can generate a time stamp list corresponding to previously fetched and stored objects (step 280).
  • the client PEP can pass both the request and the list of stored objects and time stamps to the gateway PEP (step 285), and the gateway PEP can pass the request and list on to the origin server (step 290).
  • the origin server can return an index page and object freshness information to the gateway PEP (step 295).
  • the gateway PEP can then parse the index page, review the freshness information, and generate a prefetch list based on the index page and freshness information (step 300).
  • the gateway PEP can then pass the index page, the prefetch list, and/or the freshness information to the client PEP (step 305).
  • the client PEP can pass the index page and the prefetch list on to the user (step 310).
  • the user requests the embedded objects identified in the index page (step 315).
  • the client PEP responds to this request by returning any fresh, locally stored data objects that correspond to the user's requests (step 315).
  • the gateway PEP prefetches stale and other objects needed to fill the user's requests (step 325). These objects are returned by the origin server and passed through to the client PEP to the user (steps 330, 335, and 340). The user can then combine the objects received in step 320 with the objects received in step 340, thereby filling the request made in step 315.
  • the gateway PEP rather than the client PEP can determine whether an initial request has been previously filled. In other words, the gateway PEP can keep track of what objects have been provided to the client PEP and whether or not those objects are still valid.
  • the present system provides, among other things, a system and method for reducing the impact of high latency links on interactive applications.
  • Those skilled in the art can readily recognize that numerous variations and substitutions may be made in the invention, its use and its configuration to achieve substantially the same results as achieved by the embodiments described herein. Accordingly, there is no intention to limit the invention to the disclosed exemplary forms. Many variations, modifications and alternative constructions fall within the scope and spirit of the disclosed invention as expressed in the claims.

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  • Engineering & Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Data Mining & Analysis (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Information Transfer Between Computers (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un système et un procédé pour réduire l'impact de liaisons sans fil et par satellite à temps d'attente importants, par pré-extraction prédictive et diffusion personnalisée d'objets de données désirés par un utilisateur. Dans un mode de réalisation de l'invention, un utilisateur demande tout d'abord une page Web par l'intermédiaire d'un navigateur Web. La demande est transmise à un serveur mandataire d'amélioration de performances (PEP) client (150), fréquemment incorporé au modem satellite de l'utilisateur. En réponse à la réception de la demande, le serveur d'origine produit une page d'index associée à la page Web demandée et transmet cette page d'index au PEP passerelle (145), qui l'analyse de manière à identifier les objets qu'elle contient. Ensuite, le PEP passerelle produit les demandes de pré-extraction des objets identifiés et transmet ces demandes au serveur d'origine. Le PEP client peut ensuite transmettre au moins cette page d'index à l'utilisateur.
PCT/US2002/031906 2001-10-09 2002-10-07 Systeme et procede pour gerer un echange entre un serveur passerelle et un module cote client WO2003032200A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US09/974,664 US20030069925A1 (en) 2001-10-09 2001-10-09 Performance enhancing proxy for high latency data links
US09/974,665 US20030069926A1 (en) 2001-10-09 2001-10-09 System and method for managing an exchange between a gateway server and a client-side module
US09/974,665 2001-10-09
US09/974,664 2001-10-09

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PCT/US2002/031907 WO2003032201A1 (fr) 2001-10-09 2002-10-07 Serveur mandataire d'amelioration de performances pour des liaisons de donnees a temps d'attente importants
PCT/US2002/031906 WO2003032200A1 (fr) 2001-10-09 2002-10-07 Systeme et procede pour gerer un echange entre un serveur passerelle et un module cote client

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Cited By (2)

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US7694008B2 (en) 2005-05-04 2010-04-06 Venturi Wireless Method and apparatus for increasing performance of HTTP over long-latency links
US7941609B2 (en) 2007-02-23 2011-05-10 Microsoft Corporation HTTP acceleration by prediction and pre-fetching

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EP1515233A3 (fr) * 2003-08-06 2007-03-14 Matsushita Electric Industrial Co., Ltd. Procédé, serveur et client pour réduire le temps de processus d'une communication synchrone dans un système client-serveur distribué
JP4727954B2 (ja) * 2003-08-06 2011-07-20 パナソニック株式会社 クライアントサーバ型分散システムで用いられる方法、サーバ、およびクライアント
CN102169504B (zh) * 2011-05-10 2012-11-14 航天恒星科技有限公司 一种用于卫星地面设备监控的数据库索引方法
US10084884B2 (en) 2015-07-31 2018-09-25 At&T Intellectual Property I, L.P. Facilitation of efficient web site page loading

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Cited By (5)

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US7694008B2 (en) 2005-05-04 2010-04-06 Venturi Wireless Method and apparatus for increasing performance of HTTP over long-latency links
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