Patent ID: 7930726
Filing Date: 2011-04-19
Classification: H04N

Abstract:
1. An Internet protocol television (IPTV) service system for efficient multicast of a motion picture expert group-transport stream (MPEG-TS) including a plurality of elementary streams, the system comprising: a headend configured to assign a multicast group address to each channel, assign a different source address to each packet identification (PID), and collect elementary streams corresponding to each PID to packetize the MPEG-TS into a plurality of IP packets for each channel; a set-top box configured to identify a user-selected channel and necessary elementary streams in the MPEG-TS for the selected channel, and request selective reception of IP packets corresponding to the selected channel and the necessary elementary streams from the plurality of IP packets; and a plurality of multicast routers configured to form a transmission path between the headend and the set-top box.