Patent ID: 8522288
Filing Date: 2013-08-27
Classification: H04L,H04N

Abstract:
1. An IP broadcasting system that provides IP broadcasting services over an IP multicast network, the IP broadcasting system comprising: an IP broadcasting server that distributes video data by adding a multicast group identifier; an IP broadcasting terminal that transmits an IP broadcasting channel identifier; a multicast group management apparatus for IP broadcasting that allocates the multicast group identifier to the IP broadcasting channel identifier and includes a storing unit that holds correspondence information between the multicast group identifiers and the IP broadcasting channel identifiers; and a data transfer device disposed between the IP broadcasting terminal and the multicast network for transmitting a video distribution request message, wherein the IP broadcasting terminal includes a transmitting/receiving unit that transmits a query message including the requested IP broadcasting channel identifier to the multicast group management apparatus for IP broadcasting, receives a response message including the multicast group identifier corresponding to the IP broadcasting channel identifier included in the query message, the response message being transmitted from the multicast group management apparatus for IP broadcasting, and transmits a video reception request message by using the received multicast group identifier, and wherein the data transfer device includes a transmitting unit that receives the multicast group identifier corresponding to video data information, which is held by the data transfer device, from a multicast group management apparatus for IP broadcasting on the IP multicast network, that manages correspondence information between the multicast group identifier and the video data information, and transmits a video distribution request message including the received multicast group identifier to the IP multicast network, prior to receiving a video reception request message from the IP broadcasting terminal; a receiving unit that receives video data, to which the multicast group identifier included in the video distribution request message is assigned, transmitted from the IP multicast network based on the video distribution request message; and a transfer unit that, when receiving the video reception request message from the IF broadcasting terminal, transmits the receiving video data corresponding to the video reception request message to the IP broadcasting terminal.