PACKET RECOVERY IN INTERACTIVE REAL-TIME MEDIA PROTOCOL

• US 20160323062A1
• Filed: 10/28/2015
• Published: 11/03/2016
• Est. Priority Date: 05/01/2015
• Status: Abandoned Application

• Current Assignee: Ubitus, Inc.
• Original Assignee: Ubitus, Inc.
• Inventors: Yang, Tsung-Wen, Yeh, Chung-Chou, Teng, An-Lun
• Application Number:
  US14/925,622
• Publication Number:
  US 20160323062A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H03M 13/154 Error and erasure correction, e.g. by using the error and erasure locator or Forney polynomial
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 1/1628 List acknowledgements, i.e. the acknowledgement message consisting of a list of identifiers, e.g. of sequence numbers H04L1/1614 takes precedence
• CPC Class Codes: H04L 1/1635 Cumulative acknowledgement, i.e. the acknowledgement message applying to all previous messages
• CPC Class Codes: H04L 1/1678 where the control information is for timing, e.g. time stamps
• CPC Class Codes: H04L 1/1838 for semi-reliable protocols, e.g. for less sensitive applications such as streaming video buffer level management for video bitstream receiver H04N21/44004
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04L 43/0829 Packet loss
• CPC Class Codes: H04L 43/0864 Round trip delays
• CPC Class Codes: H04L 43/0888 Throughput
• CPC Class Codes: H04L 47/11 Identifying congestion
• CPC Class Codes: H04L 47/263 Rate modification at the source after receiving feedback
• 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 47/34 ensuring sequence integrity, e.g. using sequence numbers
• CPC Class Codes: H04N 21/23614 Multiplexing of additional data and video streams arrangements for simultaneous broadcast of plural pieces of information H04H20/28
• CPC Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams
• CPC Class Codes: H04N 21/6473 Monitoring network processes errors for recovering from a failure of a protocol instance or entity H04L69/40
• CPC Class Codes: H04N 21/64776 for requesting retransmission, e.g. of data packets lost or corrupted during transmission from server ARQ protocols H04L1/18; implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP] H04L69/16
• CPC Class Codes: H04W 28/0289 Congestion control load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 28/12 : using signalling between network elements

Abstract

Methods, apparatuses, and computer program products for transporting data from a sender to a receiver with low delay for interactive real-time media applications are described.

Claims

1. A method for low-delay transmission of video frames across a network from a transmitter to a receiver with loss recovery, comprising, at one or more computers coupled to the network:

preparing a first video frame comprising a first source block of source symbols for transmission by encoding a first Forward Erasure Control (FEC) block based on the first source block of source symbols;

at the transmitter, transmitting the first FEC block to the receiver;

preparing a second video frame comprising a second source block of source symbols for transmission by encoding a second FEC block based on the second source block of source symbols; and

at the transmitter, transmitting the second FEC block to the receiver;

wherein the first FEC block protects only the first video frame and the second FEC block protects only the second video frame.

2. The method of claim 1 wherein the first FEC block comprises one or more repair symbols.

3. The method of claim 1 further comprising an Automatic Repeat Request (ARQ) scheme to provide increased protection against burst erasures.

4. The method of claim 1 wherein the first and second FEC block are encoded using a systematic code.

5. A method for low delay reception of video frames across a network from a transmitter to a receiver, comprising, at one or more computers coupled to the network:

at the receiver, receiving a Forward Erasure Control (FEC) block comprising a set of one or more source packets comprising one or more source symbols, and one or more repair packets comprising one or more repair symbols, wherein each packet comprises a sequence number;

examining the received sequence numbers to detect missing packets;

recovering missing source symbols, if any, utilizing repair symbols in the FEC block; and

assembling a first video frame from received source symbols and recovered source symbols, if any, wherein the FEC block is configured to protect one and only one video frame.

6. The method of claim 5 wherein the FEC block is decoded according to a systematic code.

7. The method of claim 5 further comprising an Automatic Repeat Request (ARQ) scheme to provide increased protection against burst erasures.

8. The method of claim 5 further comprising receiving, decoding, and assembling a second video frame from a second FEC block.

9. A computer program product in a non-transitory computer-readable medium comprising instructions executable by a computer processor to transmit video frames across a network from a transmitter to a receiver with loss recovery by:

preparing a first video frame comprising a first source block of source symbols for transmission by encoding a first Forward Erasure Control (FEC) block based on the first source block of source symbols;

at the transmitter, transmitting the first FEC block to the receiver;

preparing a second video frame comprising a second source block of source symbols for transmission by encoding a second FEC block based on the second source block of source symbols; and

at the transmitter, transmitting the second FEC block to the receiver;

wherein the first FEC block protects only the first video frame and the second FEC block protects only the second video frame.

10. The computer program product of claim 9, wherein the instructions further comprise instructions for, at the transmitter, encoding the first and second FEC block using a systematic code.

11. The computer program product of claim 9, wherein the instructions further comprise instructions for performing an Automatic Repeat Request (ARQ) procedure.

12. A computer program product in a non-transitory computer-readable medium comprising instructions executable by a computer processor to receive video frames across a network from a transmitter to a receiver by:

at the receiver, receiving a Forward Erasure Control (FEC) block comprising a set of one or more source packets comprising one or more source symbols, and one or more repair packets comprising one or more repair symbols, wherein each packet comprises a sequence number;

examining the received sequence numbers to detect missing packets;

recovering missing source symbols, if any, utilizing repair symbols in the FEC block; and

assembling a first video frame from received source symbols and recovered source symbols, if any, wherein the FEC block is configured to protect one and only one video frame.

13. The computer program product of claim 12, wherein the instructions further comprise instructions for, at the receiver, decoding the FEC block using a systematic code.

14. The computer program product of claim 12, wherein the instructions further comprise instructions for performing an Automatic Repeat Request (ARQ) procedure.