Satellite-based internet access system with remote prefetching of inline objects of web pages

• US 20030120658A1
• Filed: 01/30/2003
• Published: 06/26/2003
• Est. Priority Date: 08/06/1997
• Status: Active Grant

• Current Assignee: Bruce L. Carneal, Jeremy Guralnick, Ram A. Fish
• Original Assignee: Bruce L. Carneal, Jeremy Guralnick, Ram A. Fish
• Inventors: Carneal, Bruce L., Fish, Ram A., Guralnick, Jeremy
• Granted Patent: US 6,907,429 B2
• Time in Patent Office: Days
• US Class Current: 707/10
• CPC Class Codes: G06F 16/9574 of access to content, e.g. by caching
• CPC Class Codes: H04B 7/18582 Arrangements for data linking, i.e. for data framing, for error recovery, for multiple access
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]
• CPC Class Codes: H04L 67/2876 Pairs of inter-processing entities at each side of the network, e.g. split proxies
• CPC Class Codes: H04L 67/289 Intermediate processing functionally located close to the data consumer application, e.g. in same machine, in same home or in same sub-network
• CPC Class Codes: H04L 67/56 Provisioning of proxy services store-and-forward switching systems in data switching networks H04L12/54
• CPC Class Codes: H04L 67/5681 Pre-fetching or pre-delivering data based on network characteristics
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: Y10S 707/99931 Database or file accessing

Abstract

An satellite-based internet access includes uses a distributed proxy server that reduces a delay associated with the retrieval of inline objects of web pages. The distributed proxy server includes a first component which runs on the browser side of the satellite link and communicates with web browsers, and a second component which runs on an Internet side of the satellite link and communicates with web servers. When a web page is requested over the satellite link, the second component determines whether the parent file includes any references to inline objects, and prefetches each such inline object. The prefetched objects are transmitted over the satellite link to the first component, which in-turn stores the prefetched objects in a cache and provides the prefetched objects to the requesting web browser. The first component may also block browser requests for prefetched inline objects from unnecessarily being transmitted over the satellite link.

Claims

1. An internet access system, comprising:

an access point system that links a plurality of web browsers to a satellite link on a client side of the satellite link; and

a gateway computer system that connects the satellite link to a wide area network on an internet side of the satellite link;

wherein the access point system and the gateway computer system are configured such that page requests from the web browsers pass over the satellite link from the access point system to the gateway computer system for transmission on the wide area network, and such that responses to the page requests pass back over the satellite link from the gateway computer system to the access point system;

and wherein the access point system and the gateway computer system collectively implement an object prefetching process in which, when a web browser requests a web page that includes an inline object of at least one type, the inline object is prefetched by the gateway computer system and is transmitted over the satellite link to the access point system without waiting for a request from the web browser for the inline object.

2. The system of claim 1, wherein the satellite link is a geosynchronous satellite link.

3. The system of claim 1, wherein the gateway computer system only prefetches specific types of inline objects.

4. The system of claim 1, wherein the gateway computer system identifies the inline objects to be prefetched by scanning HTML coding of parent files of requested web pages.

5. The system of claim 1, wherein the gateway computer system transmits messages over the satellite link to notify the access point system of identities of inline objects that are being prefetched.

6. The system of claim 1, wherein the access point system stores prefetched inline objects in a cache memory, and delivers the prefetched inline objects to the web browsers in response to browser requests therefor.

7. The system of claim 1, wherein the access point system blocks browser requests for prefetched inline objects to prevent such requests from unnecessarily being transmitted over the satellite link.

8. The system of claim 1, wherein the access point system and the gateway computer system reside remotely from each other.

9. The system of claim 1, wherein the access point system and the gateway computer system collectively implement the object prefetching process transparently to the web browsers.

10. The system of claim 1, wherein the access point system and the gateway system collectively implement the object prefetching process transparently to web servers from which inline objects are prefetched.

11. An internet access system, comprising:

a first computer system that communicates locally with web browsers; and

a second computer system that communicates with the first computer system over a satellite link, said second computer being connected to a wide area network;

wherein the first and second computer systems run distributed proxy server software to allow the web browsers to communicate over the satellite link with web servers running on the wide area network;

and wherein the distributed proxy server software implements an object prefetching process in which, when a web browser requests a web page that includes an inline object of at least one type, the inline object is prefetched by the second computer system and is transmitted over the satellite link to the first computer system for delivery to the web browser.

12. The system of claim 11, wherein the satellite link is a geosynchronous satellite link.

13. The system of claim 11, wherein the second computer system only prefetches specific types of inline objects.

14. The system of claim 11, wherein the second computer system identifies inline objects to be prefetched by scanning HTML coding of parent files of requested web pages.

15. The system of claim 11, wherein the second computer system transmits messages over the satellite link to notify the first computer system of identities of inline objects being prefetched.

16. The system of claim 11, wherein the first computer system stores prefetched inline objects in a cache memory, and delivers the prefetched inline objects to the web browsers in response to browser requests therefor.

17. The system of claim 11, wherein the first computer system blocks browser requests for prefetched inline objects to prevent such requests from unnecessarily being transmitted over the satellite link.

18. The system of claim 11, wherein the distributed proxy server software implements the object prefetching process transparently to the web browsers.

19. The system of claim 11, wherein the distributed proxy server software implements the object prefetching process transparently to web servers from which inline objects are prefetched.

20. A method of retrieving a web page over a satellite link so as to reduce a page load time, the method comprising:

receiving a request from a web browser for a web page;

transmitting the request for the web page to an internet side of a satellite link; and

on the internet side of the satellite link;

(a) identifying an inline object of the web page, (b) prefetching the inline object over a wide area network from a server, and (c) transmitting the prefetched inline object over the satellite link from the internet side to a browser side.

21. The method of claim 20, wherein the method is performed transparently to a web browser that generated the request for the web page.

22. The method of claim 20, wherein the method is performed transparently to the server.

23. The method of claim 20, further comprising, on the browser side of the satellite link, delivering the prefetched inline object to the web browser in response to receiving a request for the inline object from the web browser.

24. The method of claim 20, wherein steps (a)-(c) are performed by a satellite gateway that resides on the internet side of the satellite link.

25. The method of claim 20, further comprising preventing a request from the web browser for the inline object from being unnecessarily transmitted over the satellite link.

26. The method of claim 20, wherein the step of prefetching the inline object comprises requesting the inline object prior to delivery of a parent file of the web page to the web browser.

27. A distributed proxy server that performs the method of claim 20.