Patent ID: 8036149

Claim:
A multi-casting communication system configured to allow a plurality of mobile communication terminals to conduct multi-casting communication with one another in a half-duplex manner, comprising: the plurality of mobile communication terminals, each configured to conduct voice-communication with other mobile communication terminals through a base station, and each of the plurality of mobile communication terminals comprising a half-duplex communication switch; and a controller, wherein said controller is configured to communicate with said plurality of mobile communication terminals through a network, and further configured to allow each of said plurality of mobile communication terminals to participate in a multi-casting session in accordance with predetermined rules, wherein, when a signal is received from a first mobile communication terminal among said plurality of mobile communication terminals with said half-duplex communication switch of the first mobile communication terminal being on, said controller is configured to check whether there is a second mobile communication terminal among said plurality of mobile communication terminals which is associated with a user that is presently speaking in the multi-casting session, if there is not said second mobile communication terminal, and further if there is not recorded one or more third mobile communication terminals among said plurality of mobile communication terminals in a subscriber list, said controller is configured to allow a user associated with said first mobile communication terminal to speak in the multi-casting session, if there is at least one of said second mobile communication terminal and said one or more third mobile communication terminals recorded in said subscriber list, said controller is configured to record said first mobile communication terminal in said subscriber list to thereby reserve a speaking position for the user associated with said first mobile communication terminal, wherein when a signal is received from said one or more third mobile communication terminals recorded in said subscriber list with said half-duplex communication switch being on, said controller is configured to remove recordation of said third mobile communication terminal from said subscriber list.