Network communication protocol for large scale distribution of streaming content
View Patent ↗Forward error correction may be implemented in a network having first, second and third nodes. The second node receives streaming media message packets and one or more check packets from an upstream first node. The second node transmits the message packets and check packets to a downstream third node. The second node uses the check packets to decode missing message packets and transmits the decoded missing packets to the third node before the missing message packets are to be presented by the third node. The third node may receive message packets and a first set of check packets from the second node and a second set of check packets from the first node. The third node may use check packets from both sets to decode missing message packets.
1. A method for forward error correction of streaming media content in a network, the method comprising the steps of:
generating a first set of one or more check packets with a first node from a first set of streaming media message packets;
transmitting a first set of streaming media message packets and the first set of check packets with the first node to a second node downstream of the first node; and
transmitting the first set of check packets with the first node to a third node downstream of the second node.
2. The method of claim 1 wherein generating the first set of one or more check packets includes using a probability distribution that is weighted toward more recent packets in the first set of streaming media message packets to generate the first set of check packets.
3. The method of claim 1 wherein generating the first set of check packets includes performing a logical operation involving two or more streaming media message packets received from the first node.
4. The method of claim 3 wherein the logical operation is a bit-wise Exclusive OR operation.
5. The method of claim 1 , further comprising the step of:
before transmitting a second stream of message packets from the first node to the second node, generating a second set of one or more check packets with the first node using packets selected from the first stream and the second stream.
6. The method of claim 5 , further comprising the step of transmitting the second set of check packets with the first node to the third node.
7. The method of claim 5 , wherein generating the second set of one or more check packets includes using a probability distribution that is weighted toward more recent packets in the first and second sets of streaming media message packets to generate the second set of check packets.
8. The method of claim 5 , further comprising the step of receiving with the first node information regarding errors in the streaming media message packets received by the second node from the first node.
9. The method of claim 8 , further comprising the step changing a rate of generation of check packets with first node in response to the information regarding errors.
10. The method of claim 8 , wherein the information includes an error distribution generated by the second node.
11. The method of claim 10 , further comprising the step of
with the first node, adjusting a probability distribution used for selecting message packets for generation of the check packets in response to the error distribution generated by the second node.
12. The method of claim 1 , further comprising the step of receiving with the first node the first set of streaming media message packets from a third node.
13. An apparatus for forward error correction of streaming media in a network, the apparatus include a first node, comprising:
a transmitter module configured to transmit a set of streaming media message packets and check packets to a second node downstream of the first node;
a check packet generator configured to generate one or more check packets from one or more message packets from the set of streaming media message packets; and,
a buffer for storing streaming media message packets that have been transmitted by the first node,
wherein the check packet generator is configured to use streaming media message packets stored in the buffer to generate check packets for transmission to a third node that is downstream of the second node.
14. The apparatus of claim 13 wherein the check packet generator is configured generate the check packets by performing a logical operation involving two or more streaming media message packets.
15. The apparatus of claim 14 wherein the logical operation is a bit-wise Exclusive OR operation of two or more check packets.
16. The apparatus of claim 14 wherein the check packet generator is configured to use a probability distribution that is weighted toward more recently transmitted packets stored in the buffer.