In the Internet Protocol Television (IPTV) system, it is processed fast channel change (FCC) the transaction is specially to experience slow multicast join, thereby is possible to prepare the system for the majority of multicast subscribers within the range predicted is there. During FCC transaction, the subscriber interface device, such as a set top box (STB), before it can be predicted that the distance occurs during handover from FCC unicast to multicast, to join the multicast stream of the new channel can determine can wait how long. The STB if not subscribed to a multicast stream by a determined time, STB is induced recovery step of transmitting the RESTART request the FCC server, then, to increase the rate of FCC unicast as FCC transaction is resumed, Therefore, it is possible to cause a handover seamlessly. This solution, requests for each FCC transaction becomes small, allowing greater expandability and less expense.
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