Communication system and methods using dynamic expansion for computer networks

• US 5,991,795 A
• Filed: 04/18/1997
• Issued: 11/23/1999
• Est. Priority Date: 04/18/1997
• Status: Expired due to Term

• Current Assignee: Panasonic Electric Works Company Limited (Panasonic Holdings Corporation)
• Original Assignee: emWare, Inc. (Panasonic Holdings Corporation)
• Inventors: Sontag, Christopher S., Howard, Michael L.
• Primary Examiner(s): VU, VIET DUY
• Application Number:
  US08/844,158
• Time in Patent Office: 949 Days
• Field of Search: 709/200, 709/201, 709/202, 709/203, 709/212, 709/213, 709/217, 709/218, 709/219, 709/225, 709/226, 709/230, 709/300, 707/10, 707/100, 707/104
• US Class Current: 709/201
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]
• CPC Class Codes: H04L 67/565 Conversion or adaptation of application format or content adding application control or application functional data H04L67/561
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A method for exchange of information between a requesting communication unit and a responding communication unit through an intervening communication unit. The method comprises the steps of transmitting a request for a predetermined information element to the responding communication unit using a first format, intercepting the request for the predetermined information element, searching resources local to the intervening communication unit for the requested predetermined information element, and transmitting the requested predetermined information element to the requesting communication unit. If the requested predetermined information element is not located in local resources, the method includes the steps of translating the request for the predetermined information element into a second format and transmitting the translated request to the responding communication unit, receiving the translated request, transmitting a representation of the requested predetermined information element to the requesting communication unit, intercepting the transmitted representation of the requested predetermined information element, expanding the representation to provide the requested predetermined information element, and transmitting the requested predetermined information element to the requesting communication unit. Apparatus for exchange of information is also described.

Claims

1. A method for exchange of information between a requesting communication unit and a responding communication unit through an intervening communication unit, the method comprising the steps of:

at the requesting communication unit;

(a) transmitting a request for a predetermined information element to the responding communication unit using a first format;

at the intervening communication unit;

(b) intercepting the request for the predetermined information element;

(c) searching resources local to the intervening communication unit for the requested predetermined information element; and

, if the predetermined information element is located in local resources,

(d) transmitting the requested predetermined information element to the requesting communication unit;

else, if the requested predetermined information element is not located in local resources,

(e) translating the request for the predetermined information element into a second format; and

(f) transmitting the translated request to the responding communication unit;

at the responding communication unit;

(g) receiving the translated request;

(h) transmitting a representation of the requested predetermined information element to the requesting communication unit;

at the intervening communication unit;

(i) intercepting the transmitted representation of the requested predetermined information element;

(j) expanding the representation to provide the requested predetermined information element; and

(k) transmitting the requested predetermined information element to the requesting communication unit.

2. The method in accordance with claim 1, wherein the step (a) of transmitting a request for a predetermined information element comprises the step of requesting a predetermined document via HTTP.

3. The method in accordance with claim 1, wherein the step (e) of translating the request for the predetermined information element into a second format comprises the step of translating the request into a protocol that is an enhanced version of HTTP.

4. The method in accordance with claim 1, wherein the step (h) of transmitting a representation of the requested predetermined information element comprises transmitting a compressed representation of the requested information element including at least one abridged representation of an object associated with the requested information element.

5. The method in accordance with claim 4, wherein said object associated with the requested information element comprises an executable program element.

6. The method in accordance with claim 4, wherein said object associated with the requested information element comprises an image file.

7. The method in accordance with claim 1, wherein the step (j) of expanding the representation comprises the step of dynamically expanding the representation by acquiring referenced objects associated with the requested information element modeled by the representation.

8. The method in accordance with claim 1, wherein the predetermined information element specifies at least one additional information element, and the method further comprises the steps of:

at the requesting communication unit;

(l) transmitting a request for said at least one additional information element to the responding communication unit;

at the intervening communication unit;

(m) intercepting the request for said at least one additional information element;

(n) extracting search-specific information regarding said at least one additional information element from the intercepted request;

(o) conducting a series of searches for said at least one additional information element within a predetermined set of target libraries, wherein library search chronology and specific target library designation are determined by said extracted search-specific information; and

(p) transmitting said at least one additional information element to the requesting communication unit.

9. The method in accordance with claim 8, wherein the step (l) of transmitting a request for said at least one additional information element comprises the step of transmitting a request for at least one additional document referenced in the originally requested predetermined information element.

10. The method in accordance with claim 8, wherein the step (n) of extracting search-specific information comprises the step of examining document class designations for said additional documents referenced.

11. The method in accordance with claim 8, wherein the step (o) of conducting a series of searches further comprises the steps of:

(o1) first, searching document libraries on local storage media with order of search determined at least in part by document class designation; and

(o2) subsequently searching document libraries associated with remote communication units.

12. Apparatus for exchange of information comprising:

means for transmitting a request for a predetermined information element from a requesting communication unit to a responding communication unit using a first format;

means for intercepting the request for the predetermined information element at an intervening communication unit;

means for searching resources local to the intervening communication unit for the requested predetermined information element;

means for determining whether the requested predetermined information element is located in local resources;

means for transmitting the requested predetermined information element to the requesting communication unit if the requested predetermined information element is located in local resources;

means for translating the request for the predetermined information element into a second format provided that the requested predetermined information element is not located in local resources;

means for transmitting the translated request to the responding communication unit;

means for receiving the translated request at the responding communication unit;

means for transmitting a representation of the requested predetermined information element to the requesting communication unit;

means for intercepting the transmitted representation of the requested predetermined information element at the intervening communication unit;

means for expanding the representation to provide the requested predetermined information element; and

means for transmitting the requested predetermined information element to the requesting communication unit.

13. The apparatus of claim 12, wherein the means for transmitting a request comprises a requesting computer system interconnected with the responding communication unit.

14. The apparatus of claim 13, wherein the requesting computer system includes web browser software.

15. The apparatus of claim 12, wherein the means for intercepting the request comprises an intervening communication unit interconnected with the requesting communication unit.

16. The apparatus of claim 15, wherein the intervening communication unit comprises a communication unit selected from the group of communication units consisting of:

a file server;

a proxy server; and

a common gateway interface.

17. A method for implementing an abridged communication protocol for exchange of information among communication units, wherein a designated server communication unit includes, accessible in local storage, a document directory having a symbolic reference to available documents, selected parameter values, and selected operations, the method comprising the steps of:

at a requesting communication unit;

(a) transmitting a request to the designated server communication unit for a predetermined document defining selected protocol standards; and

upon receiving said predetermined document,

(b) formatting a request in accordance with the protocol standards; and

(c) transmitting the request to the designated server communication unit;

at the designated server communication unit;

(d) receiving the transmitted request;

(e) extracting request-specific information from the received request; and

, if the request is for a document,

(f) using a received document identifier as an index into the symbolic reference to available documents, accessing and transmitting the requested document to the requesting communication unit; and

if the request is for a parameter value,

(g) using a received parameter identifier as an index into the symbolic reference to selected parameter values, accessing and transmitting the requested parameter to the requesting communication unit; and

, if the request is for an operation,

(h) using a received operation identifier as an index into the symbolic reference to selected operations, performing the selected operation.

18. The method in accordance with claim 17, wherein the abridged communication protocol comprises an enhanced version of HTTP.

19. The method in accordance with claim 17, wherein the step (a) of transmitting a request to the designated server communication unit comprises transmitting a request for a capabilities document that includes indicia representing software version and revision level, ordering of data elements, and size of data elements.

20. The method in accordance with claim 17, wherein the symbolic reference to available documents comprises a document directory having a symbol table including entries corresponding to documents, parameter values and operations stored on or recognized by the server communication unit.

21. The method in accordance with claim 20, wherein documents stored on or recognized by the server communication unit are of a type selected from the set of document types consisting of:

static documents;

dynamic documents;

invocation documents; and

variable manipulation documents.

22. The method in accordance with claim 21, wherein static documents comprise documents that change only when software version or revision level changes.

23. The method in accordance with claim 21, wherein dynamic documents comprise documents that change from time to time, and each dynamic document includes a stored modification date and a stored revision date.

24. The method in accordance with claim 21, wherein an invocation document invokes an operation.

25. The method in accordance with claim 21, wherein a variable manipulation document manipulates a parameter value.

26. The method in accordance with claim 19, wherein the capabilities document is the first ordered document stored on the server and is denominated document 0.

27. The method in accordance with claim 20, wherein the document directory is the second ordered document stored on the server and is denominated document 1.

28. The method in accordance with claim 20, wherein the symbolic reference to selected parameter values is the third ordered document stored on the server and is denominated document 2.