Methods and apparatus for efficiently accessing periodically broadcast data

• US 6,976,268 B2
• Filed: 12/08/2000
• Issued: 12/13/2005
• Est. Priority Date: 12/10/1999
• Status: Active Grant

• Current Assignee: Oracle America, Inc. (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Courtney, Jonathan D., Calder, Bartley H., Loo, James Van, Rivas, Jesus David
• Primary Examiner(s): Miller, John
• Assistant Examiner(s): SALCE, JASON P
• Application Number:
  US09/733,609
• Publication Number:
  US 20020116711A1
• Time in Patent Office: 1,831 Days
• Field of Search: 725/50, 725/68, 725/100, 725/131, 725/134, 725/139, 725/142, 709/204, 709/217, 709/219, 718/1, 718/100, 718/104
• US Class Current: 725/134
• CPC Class Codes: H04N 21/4147 PVR [Personal Video Recorder] H04N5/76 takes precedence ; arrangements for broadcast with accumulation-type receivers H04H20/40
• CPC Class Codes: H04N 21/4331 Caching operations, e.g. of an advertisement for later insertion during playback
• CPC Class Codes: H04N 21/4349 by extracting from data carousels, e.g. extraction of software modules from a DVB carousel
• CPC Class Codes: H04N 21/443 OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
• CPC Class Codes: H04N 21/4782 Web browsing , e.g. WebTV
• CPC Class Codes: H04N 21/643 Communication protocols network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP], H04L65/65

Abstract

The invention relates to methods and apparatus for accessing data that is periodically transmitted by a broadcaster. In accordance with one aspect of the invention, a receiver capable of reception of data is disclosed. The data is transmitted by a broadcaster in a broadcasting system. The receiver reduces the delay conventionally encountered in accessing periodically transmitted data in a broadcasting system.

Claims

1. A method of providing access to a selected portion of data that is periodically transmitted via a plurality of channels by a broadcaster in a broadcast system, said method comprising:

receiving, by a receiver in said broadcast system, a request from a requester, wherein said request requests a first selected data portion in a plurality of data portions that are periodically transmitted by said broadcaster in said broadcast system via a first channel;

instantiating a first carrousel object for said first selected data portion, wherein said first carrousel object is associated with a carrousel class that can encapsulate data periodically transmitted by the broadcaster to abstract said first channel used to broadcast said first selected data portion, thereby allowing data to be accessed via said first carrousel object without requiring said requestor to access said first selected data portion via said first channel used by the broadcaster to broadcast said first selected data portion;

initiating a request to receive said first selected data portion via said first carrousel object in response to said instantiating of said first carrousel object;

determining whether said first selected data portion is available in a storage used to store said periodically transmitted data in response to said instantiating of said first carrousel object;

acquiring said first selected data portion form said storage in response to said initiating of said request when said determining determines that said first selected data portion is available in said storage;

providing access to said first selected data portion stored in said storage via said first carrousel object when said determining determines that said first selected data portion is available in said storage, thereby allowing said first selected data portion to be accessed by said requester without said requestor having to wait for the next transmission of said first selected data portion on said first channel;

storing said first selected data portion in said storage, in response to said instantiating of said first carrousel object, when said determining determines that said first selected data portion is not available in said storage;

sending, to said requestor, a notification which indicates said first selected data portion can be accessed via said first carrousel object, when said first selected data portion is stored in said storage device and becomes available for access via said first carrousel object; and

providing access to said first selected data portion stored in said storage via said first carrousel object after said notification is sent, thereby allowing said requester to access said first selected data portion via said first carrousel object when it becomes available and without having to listen to said first channel.

2. A method as recited in claim 1, wherein said method further comprises:

receiving a request for updates of said first data portion;

determining whether said first data portion has been updated; and

sending an update notification when said first data portion has been updated.

3. A method as recited in claim 2, wherein said method further comprises:

receiving a subscription request for updates to said first data portion; and

determining whether said data portion has been updated; and

sending an update notification when said determining determines that said first data portion has been updated.

4. A method as recited in claim 3, wherein said method further comprises:

receiving a request to cancel said subscription request.

5. A method as recited in claim 1,

wherein said access to said first data portion is provided by creating a file system that represents data transmitted by said broadcaster, and

wherein a set of input and output operations are provided for said file system.

6. A method as recited in claim 1, wherein said access to said first data portion is provided by creating an object file that represents the data transmitted by said broadcaster.

7. A method as recited in claim 6, wherein said data object is implemented as a carrousel file.

8. A method as recited in claim 7, wherein said carrousel file is implemented as a Java™

carrousel class that is compliant with Java™

Programming language.

9. A method as recited in claim 8, wherein said method further comprises:

instantiating a carrousel file object;

initiating a read operation on the carrousel file object; and

waiting until the read operation successfully completes.

10. A method as recited in claim 1, wherein said access is provided by a Java TV™

compliant Application Programming Language (API).

11. A receiver suitable for accessing selected portions of data that is periodically transmitted by a broadcaster in a broadcasting system, wherein said receiver operates to:

receive, by a receiver in said broadcast system, a request from a requester, wherein said request requests a first selected data portion in a plurality of data portions that are periodically transmitted by said broadcaster in said broadcast system via a first channel;

instantiate a first carrousel object for said first selected data portion, wherein said first carrousel object is associated with a carrousel class that can encapsulate data periodically transmitted by the broadcaster to abstract said first channel used to broadcast said first selected data portion, thereby allowing data to be accessed via said first carrousel object without requiring said requestor to access said first selected data portion via said first channel used by the broadcaster to broadcast said first selected data portion;

initiate a request to receive said first selected data portion via said first carrousel object in response to said instantiating of said first carrousel object;

determine whether said first selected data portion is available in a storage used to store said periodically transmitted data in response to said instantiating of said first carrousel object;

acquire said first selected data portion form said storage in response to said initiating of said request when said determining determines that said first selected data portion is available in said storage;

provide access to said first selected data portion stored in said storage via said first carrousel object when said determining determines that said first selected data portion is available in said storage, thereby allowing said first selected data portion to be accessed by said requester without said requestor having to wait for the next transmission of said first selected data portion on said first channel;

store said first selected data portion in said storage, in response to said instantiating of said first carrousel object, when said determining determines that said first selected data portion is not available in said storage;

send, to said requestor, a notification which indicates said first selected data portion can be accessed via said first carrousel object, when said first selected data portion is stored in said storage device and becomes available for access via said first carrousel object; and

provide access to said first selected data portion stored in said storage via said first carrousel object after said notification is sent, thereby allowing said requester to access said first selected data portion via said first carrousel object when it becomes available and without having to listen to said first channel.

12. A receiver as recited in claim 11, wherein said receiver further:

receives a request for updates of said first data portion;

determines whether said first data portion has been updated; and

sends an update notification when said first data portion has been updated.

13. A receiver as recited in claim 11, wherein said receiver further:

receives a subscription request for receiving updates to said first data portion; and

determines whether said first data portion has been updated; and

sends an update notification when said determining determines that said data portion has been updated.

14. A receiver as recited in claim 13,

wherein said access to said first data portion is provided by creating a file system that represents the data transmitted by said broadcaster, and

wherein a set of input and output operations are provided for said file system.

15. A receiver as recited in claim 13, wherein said access to said first data portion is provided by creating an object that represents the data transmitted by said broadcaster.

16. A receiver as recited in claim 15, wherein said data object is implemented as a carrousel file.

17. A receiver as recited in claim 13, wherein said carrousel file is implemented as a Java™

carrousel class that is compliant with Java™

Programming language.

18. A computer readable medium including computer program code for providing access to data that is periodically transmitted by a broadcaster in a broadcast system, said computer readable media comprising:

computer program code for receiving, by a receiver in said broadcast system, a request from a requester, wherein said request requests a first selected data portion in a plurality of data portions that are periodically transmitted by said broadcaster in said broadcast system via a first channel;

computer program code for instantiating a first carrousel object for said first selected data portion, wherein said first carrousel object is associated with a carrousel class that can encapsulate data periodically transmitted by the broadcaster to abstract said first channel used to broadcast said first selected data portion, thereby allowing data to be accessed via said first carrousel object without requiring said requestor to access said first selected data portion via said first channel used by the broadcaster to broadcast said first selected data portion;

computer program code for initiating a request to receive said first selected data portion via said first carrousel object in response to said instantiating of said first carrousel object;

computer program code for determining whether said first selected data portion is available in a storage used to store said periodically transmitted data in response to said instantiating of said first carrousel object;

computer program code for acquiring said first selected data portion form said storage in response to said initiating of said request when said determining determines that said first selected data portion is available in said storage;

computer program code for providing access to said first selected data portion stored in said storage via said first carrousel object when said determining determines that said first selected data portion is available in said storage, thereby allowing said first selected data portion to be accessed by said requester without said requestor having to wait for the next transmission of said first selected data portion on said first channel;

computer program code for storing said first selected data portion in said storage, in response to said instantiating of said first carrousel object, when said determining determines that said first selected data portion is not available in said storage;

computer to program code for sending, to said requestor, a notification which indicates said first selected data portion can be accessed via said first carrousel object, when said first selected data portion is stored in said storage device and becomes available for access via said first carrousel object; and

computer program code for providing access to said first selected data portion stored in said storage via said first carrousel object after said notification is sent, thereby allowing said requester to access said first selected data portion via said first carrousel object when it becomes available and without having to listen to said first channel.

19. A computer readable medium as recited in claim 18, wherein said access to said first data portion is provided by creating an object that represents data transmitted by said broadcaster.

20. A computer readable medium as recited in claim 19, wherein said data object is implemented as a carrousel file.

21. A computer readable medium as recited in claim 19, wherein said carousel file is implemented as a Java™

carrousel class that is compliant with Java™

Programming language.