Method and system for reducing switching delays between digital video feeds using personalized unicast transmission techniques

• US 20080109557A1
• Filed: 02/06/2007
• Published: 05/08/2008
• Est. Priority Date: 11/02/2006
• Status: Abandoned Application

• Current Assignee: Kasenna, Inc. (Enghouse Systems Limited)
• Original Assignee: Kasenna, Inc. (Enghouse Systems Limited)
• Inventors: Muthukumarasamy, Jayakumar K., Joshi, Vinay, Malik, Rajiv
• Application Number:
  US11/703,529
• Publication Number:
  US 20080109557A1
• Time in Patent Office: Days
• US Class Current: 709/231
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/2416 Real-time traffic
• CPC Class Codes: H04L 47/283 in response to processing delays, e.g. caused by jitter or round trip time [RTT]
• CPC Class Codes: H04L 65/613 for the control of the source by the destination control signals issued by the client directed to the server or network components specially adapted for selective content distribution H04N21/637
• CPC Class Codes: H04L 65/752 adapting media to network capabilities
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]

Abstract

Multi-media and video content distribution and transmission scheme. Method and system for reducing video media channel switching delays that might conventionally occur between different digital video feeds using a personalized unicast video distribution and personalized transmission techniques. Method and system for performing a unicast channel change operation between a client and a server coupled with the client. A fast channel change appliance.

Claims

1. A method for reducing media channel switching delays between different digital video feeds, the method characterized in that:

the method provides a personalized unicast distribution using a personalized transmission technique from a server to a client; and

the server changes the media channel in response to a request for channel change from the client.

2. A method comprising:

receiving a channel change request from a client;

determining client properties in response to the received request;

identifying the nearest RAP as nRAP;

identifying the nearest PCR as nPCR and the nearest sequence parameter set (SPS) as nSPS;

determining if Dist(nRAP, nSPS) is greater than Dist (nRAP, nPCR);

if Dist(nRAP, nSPS)>

Dist (nRAP, nPCR) then find the nearest PSI (as nPSI) from nSPS and otherwise find the nearest PSI (as nPSI) from nPCR;

generate a personalized channel stream for the client with optional switch data; and

initiating streaming data from nPSI for the client.

3. A method as in claim 2, further comprising using throttling to reduce client buffering delay.

4. A system comprising:

an edge router receiving broadcast data from an external broadcast data source;

a fast channel change (FCC) server or appliance coupled to the edge router via a r-link,

a DSLAM coupled to the FCC server or appliance; and

the FCC server or appliance and the DSLAM interfacing to a client via a subscriber network.

5. A method for performing a unicast channel change operation between a client and a server coupled with the client, the method comprising:

sending first data over a first channel by a server to a client;

receiving first data over a first channel by the client from the server;

while the client is receiving the first data for the first channel, the client sending a channel change request to the server, to request a change to a second channel and second data different than the first channel and first data;

receiving the channel change request by the server;

in response to receipt of the channel change request, the server stopping sending first data on the first channel, and initiating sending second data on a second channel to the client;

receiving the second data on the second channel by the client from the server in response to the request to change channel sent to the server.

6. A method as in claim 5, further comprising:

before receiving the request for a channel change, initializing the client device including the client device contacting the data server, and establishing a unicast channel connection between the client and the server.

7. A method as in claim 6, wherein the unicast channel connection is established using either a unicast address and port or a multicast address and port of the client.

8. A method as in claim 7, wherein the establishment of the unicast channel connection comprises the client sending a connection request to the server and identifying an internet protocol (IP) address for communication to the server.

9. A method as in claim 8, wherein the identification further includes registering the client address with the server.

10. A method as in claim 5, further comprising:

sending to the server, by the client, a request to receive data corresponding to a particular channel.

11. A method as in claim 10, wherein the particular channel is a default channel assigned by the client, or by the server, or by the system, or identified by a subscriber using the client as their default channel.

12. A method as in claim 10, wherein the particular channel is a selected channel.

13. A method as in claim 10, further comprising:

the server responding to the request received from the client, by switching unicast data stream delivery from the default unicast channel to the selected unicast channel and delivering the selected unicast channel data to the client.

14. A method as in claim 5, further comprising:

recognizing a choice by the client from a user to choose a different channel from the current channel, and the client responding to the choice by sending a request for a channel change to the server to receive data corresponding to a chosen channel.

15. A method as in claim 5, wherein the request for a channel change is communicated from the client to the server using the substantially the reverse physical communication path as used for the communication of data from the server to the client.

16. A method as in claim 5, wherein the request for a channel change is communicated from the client to the server using a single physical communication path, over a switched or non-switched network, as the physical communications path used for the communication of data from the server to the client.

17. A method as in claim 15, wherein the single physical communication path provides for a first logical path from the server to the client, and a second logical path for communication from the client to the server.

18. A method as in claim 16, wherein the single physical communication path includes a communication path through a router and a DSLAM.

19. A method as in claim 18, wherein the request from the client to the server is made using an out-of-band logical or physical communication path different from the in-band communication path of the data stream being sent to the client.

20. A method as in claim 19, wherein the request by the client to the server to change to a second channel, is generated in response to receipt of a channel change choice command received by the client device.

21. A method as in claim 20, wherein the channel change choice command received by the client device comprises a channel change input by a subscriber viewer.

22. A method as in claim 21, further comprising:

after the client begins to receive the data for the second channel, the client optionally recognizing a change in the second channel data program definition and performing a clear operation of first channel data and metadata in the client.

23. A method as in claim 22, wherein the clear operation is accomplished by a reset of a decoder in the client, the clear operation flushing or clearing data stream buffers and data stream properties present in the decoder.

24. A method as in claim 23, wherein the reset includes a soft-reset of the decoder in the client to clear the decoder previous data content

25. A method as in claim 5, further comprising:

receiving the new data for the selected second channel, extracting new second channel data stream properties, and at least partially filling a data buffer before beginning a play of the second channel data so as to avoid data underflow and display artifacts caused by having insufficient second channel data to play, and sending the decoded selected second channel data for the to a display device integral with or coupled to the client device.

26. A method for performing a server-side unicast channel change operation between a client and a server coupled with the client, the method comprising:

sending first data over a first channel by a server to a client;

receiving the channel change request by the server; and

in response to receipt of the channel change request, the server stopping sending first data on the first channel, and initiating sending second data on a second channel to the client

27. A method for performing a client-side unicast channel change operation between a client and a server coupled with the client, the method comprising:

receiving first data over a first channel by the client from the server;

while the client is receiving the first data for the first channel, the client sending a channel change request to the server, to request a change to a second channel and second data different than the first channel and first data; and

receiving the second data on the second channel by the client from the server in response to the request to change channel sent to the server.

28. A system comprising:

a channel change appliance for coupling to a network and receiving an encoded data stream from the network;

a second appliance performing a function of a Digital Subscriber Line Access Multiplexer (DSLAM) receiving the communicating a plurality of output data stream to a plurality of client devices, at least one of the output data stream communicated to the plurality of client devices being a personalized unicast output data stream communicated to a particular one of the client devices;

a switch or router coupled to the channel change appliance for switching or routing at least one data stream to the second appliance; and

a communication link between the channel change appliance and the client device for communicating a channel change request signal identifying a request channel or data stream.

29. A system as in claim 28, wherein the channel change appliance comprises an FCC appliance or server.

30. A system as in claim 28, wherein the second appliance comprises a Digital Subscriber Line Access Multiplexer (DSLAM).

31. A system as in claim 28, wherein the client device comprises a set-top box coupled to a digital TV.

32. A computer program stored on a computer readable media and including instructions for execution in a processor logic to modify or control the operation of the processor logic or of a device or system in communication with the processor logic, the instructions including instructions to perform a method for performing a unicast channel change operation between a client and a server coupled with the client, the method comprising:

sending first data over a first channel by a server to a client;

receiving first data over a first channel by the client from the server;

while the client is receiving the first data for the first channel, the client sending a channel change request to the server, to request a change to a second channel and second data different than the first channel and first data;

receiving the channel change request by the server;

in response to receipt of the channel change request, the server stopping sending first data on the first channel, and initiating sending second data on a second channel to the client;

receiving the second data on the second channel by the client from the server in response to the request to change channel sent to the server.

33. A fast channel change appliance for performing a unicast channel change operation between a client and a server coupled with the client, the fast channel change appliance comprising:

means for sending first data over a first channel by a server to a client;

means receiving the channel change request by the server; and

means for controlling operation of the appliance so that in response to receipt of the channel change request, the server stopping sending first data on the first channel, and initiating sending second data on a second channel to the client.