IP BROADCAST SYSTEM, AND MULTICAST GROUP MANAGEMENT APPARATUS FOR IP BROADCAST

摘要

PROBLEM TO BE SOLVED: To provide an IP broadcast system capable of receiving an IP broadcast video via an IP multicast network.;SOLUTION: In an IP broadcast system, a multicast group management apparatus 10 for IP broadcast, which holds a multicast group identifier, is connected via an IP multicast network 40 whereon IP broadcast services are provided. When requesting switching of an IP broadcast channel from an IP broadcast terminal 30, a user transmits a query message, indicative of a requested IP broadcast channel identifier, to the management apparatus 10. A response message indicating correspondence between the IP broadcast channel identifier and the multicast group identifier is then received from the management apparatus 10 and the IP broadcast terminal 30 uses the received multicast group identifier to transmit a video reception request message to the multicast group.;COPYRIGHT: (C)2009,JPO&INPIT