Patent ID: 8588077
Filing Date: 2013-11-19
Classification: H04L

Abstract:
1. A method comprising: receiving a multicast media stream at a media retransmission device; caching the multicast media stream in a local media cache at the media retransmission device, wherein the media retransmission device shares an IP address with at least one other media retransmission device, and wherein the shared IP address is for addressing retransmission requests from at least one media stream receiver; receiving a unicast Internet Protocol (IP) request from the at least one media stream receiver for retransmission of the cached multicast media stream, wherein the retransmission request is directed to the media retransmission device according to an IP topology relationship between the media retransmission device and the at least one media stream receiver, and wherein the retransmission requests are Real-Time Transport Control Protocol (RTCP) Negative Acknowledgement (NACK) packets that include the shared IP address as a destination address; sending a unicast IP message to the requesting media stream receiver to dynamically instantiate a unicast Real Time Transport (RTP) repair session; and unicasting a cached requested portion of the multicast media stream to the media stream receiver.