Network architecture for data transmission

• US 7,546,355 B2
• Filed: 01/16/2004
• Issued: 06/09/2009
• Est. Priority Date: 01/16/2004
• Status: Expired due to Term

• Current Assignee: Bloomberg Finance LP (Bloomberg LP)
• Original Assignee: Bloomberg Finance LP (Bloomberg LP)
• Inventors: Kalnitsky, Yury
• Primary Examiner(s): Cardone; Jason
• Assistant Examiner(s): Patel; Chirag R
• Application Number:
  US10/760,137
• Publication Number:
  US 20050198097A1
• Time in Patent Office: 1,971 Days
• Field of Search: 709/219, 709/227
• US Class Current: 709/219
• CPC Class Codes: H04L 12/1859 adapted to provide push services, e.g. data channels
• CPC Class Codes: H04L 12/1886 with traffic restrictions for efficiency improvement, e.g. involving subnets or subdomains
• CPC Class Codes: H04L 65/61 for supporting one-way streaming services, e.g. Internet radio
• CPC Class Codes: H04L 65/611 for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06

Abstract

A content distribution network with client side multicasting properties that operates with a reduced bandwidth is provided. The requested content, such as multimedia content, is provided in a format suitable for transmission over existing unicast communication links and is then changed to a multicast format for local distribution. This allows an application provider to transmit a single unicast stream of content to a client-side media server in a local area network (LAN) and then distribute it to multiple interested users within the LAN using a multicasting transmission format. This significantly reduces bandwidth requirements by providing a single unicast transmission to a LAN rather than supply each user within the LAN with a dedicated content stream.

Claims

1. A method for providing streamed electronic content to a plurality of user terminals in a client network from at least one remote electronic content source, the method comprising:

receiving at a client-side computer requests from two or more user terminals in the client network for a common desired streamed content from the at least one remote electronic content store;

said client-side computer forwarding at least one content request to the at least one remote electronic content store for the common desired streamed content;

receiving by the client-side computer from the at least one content source a streamed unicast transmission of the requested content in response to said at least one content request;

said client-side computer distributing the received streamed content corresponding to said streamed unicast transmission to each of the requesting plurality of user terminals in the client network; and

said client-side computer being operative in terminating the content transmission being received by the client-side computer from the at least one content source when the client-side computer is not distributing the content to any of the requesting user terminals.

2. The method of claim 1 wherein distributing the received streamed content comprises distributing the content to a multicast group including each of the user terminals in the client network which has provided a request for content by subscribing to the multicast group.

3. The method of claim 1 comprising transmitting additional content from the at least one content source to the client-side computer in response to a request by at least one user terminal in the client network for content not currently being transmitted by the at least one content source to the client-side computer.

4. The method of claim 3 wherein transmitting the additional content comprises transmitting the additional content in another unicast transmission from the at least one content source to the client-side computer.

5. The method of claim 1 wherein the streamed unicast transmission comprises unicast format content converted from multicast format content for transmission to the client-side computer.

6. The method of claim 1 further comprising the client-side computer processing the received content, wherein said client-side computer processing comprises converting content received in a unicast format into a multicast format suitable for distribution to subscribers of a multicast group.

7. The method of claim 1 comprising monitoring streamed content and maintaining an amount of bandwidth suitable for servicing at least one application, other than an application servicing the distributed content, being run by each of the requesting user terminals.

8. The method of claim 1 wherein the content is transmitted across the Internet.

9. A system for providing streamed electronic content to a plurality of user terminals in a client network from a remote electronic content source, the system comprising:

a plurality of user terminals in a client network;

a content source which provides a streamed unicast transmission of content in response to the requests of two or more user terminals in the client network;

a client-side computer in the client network that is operative in forwarding to the content source at least one of the requests of the two or more user terminals, receiving the streamed unicast transmission of requested content, and distributing the received content to the requesting user terminals in the client network such that two or more of the requesting user terminals receive the requested content corresponding to the streamed unicast transmission, and terminating the content transmission being received by the client-side computer from the at least one content source when the client-side computer is not distributing the content to any of the requesting user terminals.

10. The system of claim 9 wherein the client-side computer comprises a listening socket for receiving and queuing content requests.

11. The system of claim 9 wherein the client-side computer includes software causing the client-side computer to form a multicast group including each of the user terminals in the client network which has provided a request for content by subscribing to the multicast group, the client-side computer comprising a monitoring program to monitor whether subscribers are requesting the content transmitted by the content source.

12. The system of claim 11 wherein the monitoring program includes software that terminates the content transmission if no subscriber within the multicast group is requesting the streamed content from the content source.

13. The system of claim 11 wherein the monitoring program includes software that requests transmission of an additional content stream if a subscriber within the multicast group is requesting content not currently being transmitted by the content source.

14. The system of claim 9 wherein the content source comprises circuitry that converts multicast format content into unicast format content for transmission to the client-side computer.

15. The system of claim 9 wherein the client-side computer comprises a pseudo media player that converts content received in unicast format into a multicast format suitable for distribution to the multicast group.

16. The system of claim 11 wherein the monitoring program includes software that ensures that a minimum amount of upstream bandwidth is preserved in a transmission path for accommodating application critical communications.

17. A method for providing streamed electronic content to a plurality of user terminals in a client network from a remote electronic content source, the method comprising:

receiving at a client-side computer requests from two or more user terminals in the client network for a common desired streamed content from the electronic content source;

said client-side computer forwarding at least one content request to the at least one remote electronic content store for the common desired streamed content;

forming a multicast group comprising user terminals that have provided requests for the streamed content;

receiving by the client-side computer from the at least one content source a streamed unicast transmission of the requested content in response to said at least one content request;

said client-side computer distributing the received content corresponding to said streamed unicast transmission to each of the requesting user terminals of the client network in the multicast group; and

said client-side computer terminating the content transmission being received by the client-side computer from the at least one content source when the client-side computer is not distributing the content to any of the requesting user terminals.

18. A method for providing a minimum quality of service in a reduced bandwidth network that provides streamed electronic content to a plurality of user terminals in a client from a remote electronic content source, the method comprising:

receiving at a client-side computer requests from two or more user terminals in a client network for a common desired streamed content from the at least one remote electronic content store;

said client-side computer forwarding at least one content request to the at least one remote electronic content store for the common desired streamed content;

receiving by the client-side computer from the at least one content source a streamed unicast transmission of the requested content in response to said at least one content request;

said client-side computer distributing the received streamed content corresponding to said streamed unicast transmission to each of the requesting plurality of user terminals in the client network;

said client-side computer terminating the content transmission being received by the client-side computer from the at least one content source when the client-side computer is not distributing the content to any of the requesting user terminals; and

monitoring the client-side computer for potential quality of service problems.

19. The method of claim 18 wherein the monitoring further comprises assessing the availability of other client-side computers.

20. The method of claim 19 further comprising replacing an inoperative client-side computer with a computer deemed available in the assessing step to maintain a minimum quality of service level.

21. The method of claim 19 further comprising reassigning at least part of a workload of a client-side computer deemed overburdened by fault detection software with a computer deemed available in the assessing step to balance client-side computer workload.

22. A system for providing streamed electronic content to a plurality of user terminals in a client network from a remote electronic content source, the system comprising:

a plurality of user terminals in a client network, each including a display device;

a content source which provides a streamed transmission in a unicast format of content in response to the requests of two or more user terminals in the client network;

a client-side computer in the client network that is operative in forwarding to the content source at least one of the requests of the two or more user terminals, receiving the streamed unicast format transmission of requested content, processing the streamed content into a multicast format, distributing the processed multicast format content to the requesting user terminals in the client network such that two or more of the requesting user terminals receive the requested content corresponding to the streamed unicast format transmission, and terminating the content transmission being received by the client-side computer from the at least one content source when the client-side computer is not distributing the content to any of the requesting user terminals;

each of the plurality of terminals in the client network including software for processing received streamed multicast format content into unicast format for display on a respective display device.

23. The system of claim 22 wherein each of the plurality of terminals in the client network includes a local proxy which includes the software.

24. A system for providing electronic content to a plurality of user terminals in a client network from a remote electronic content source, the system comprising:

a plurality of user terminals in a client network;

a content source which provides a streamed unicast transmission of content in response to the requests of two or more user terminals in the client network;

a client-side computer in the client network that is operative in forwarding to the content source at least one of the requests of the two or more user terminals, receiving the streamed unicast transmission of requested content, card distributing the received content to the requesting user terminals in the client network such that two or more of the requesting user terminals receive the requested content corresponding to the streamed unicast transmission, and terminating the content transmission being received by the client-side computer from the at least one content source when the client-side computer is not distributing the content to any of the requesting user terminals;

each of the plurality of terminals in the client network including a local proxy which prepares the distributed streamed content for display at the respective user terminal.

25. A method for providing streamed electronic content to a plurality of user terminals in a client network from a remote electronic content source, the system comprising:

providing a streamed transmission in a unicast format of content from the remote content source in response to the requests of two or more user terminals in the client network, at least one of the requests being forwarded to the remote content source by a client-side computer in the client network;

receiving the streamed unicast format transmission of requested content in the client-side computer in the client network;

processing the streamed content into a multicast format in the client-side computer;

distributing via the client-side computer the received and processed multicast format content to the requesting user terminals in the client network;

processing received streamed multicast format content into unicast format in the respective user terminal for display at a respective terminal; and

said client-side computer being tenninating the content transmission being received by the client-side computer from the remote content source when the client-side computer is not distributing the content to any of the requesting user terminals.