METHOD AND CONVERGENCE GATEWAY FOR PROVIDING VERTICAL HANDOVER RELATED TO MULTICAST SERVICE

摘要

PURPOSE: A method and a convergence gateway for serving the vertical hand over for a multicast service are provided to serve the multicast service such as IPTV(Internetwork Protocol TV) service without the disconnection to subscribers moving in the heterogenous network. CONSTITUTION: A controller(130) decides that of generating the vertical the hand over between the different kind of access network, if the identified information and 'the identifying information of the multimedia stream which it presently serves to a terminal requesting the multicast service' are different each other. A communications unit(110) forwards the received message to a server. The communications unit receives the multimedia stream corresponding to the identified identifying information from the server. The communications unit transmits the received multimedia stream to a source access network.