Patent ID: 8055258

Claim:
A roaming service method in a mobile broadcasting system, the method comprising: receiving, by a terminal, a service guide from a corresponding visited service provider (Visited SP) when the terminal moves to a roaming area; transmitting, by the terminal, a request message for requesting a purchase item allowable for individual services to a home service provider (Home SP) based on the received service guide; upon receipt of the request message, negotiating, by the Home SP, roaming authorization and allowable scope for the individual services with the Visited SP where the terminal is located, based on the request message; and transmitting, by the Home SP, the allowable scope for the individual services, negotiated with the Visited SP, to the terminal, as a response to the request message sent by the terminal; wherein the allowable scope for the individual services indicates at least one of an actual reception right of a service corresponding to the purchase item which the terminal is allowed to have, a reception possibility of the service, information on an occurrence of additional cost associated with a reception of the service, and information on a change in a charging system associated with the roaming of the terminal wherein the negotiating comprises: transmitting, by the Home SP, a roaming request message to the Visited SP based on the received the request message, wherein the roaming request message includes the purchase item and terminal subscription type information for determining in which class the roaming-requested terminal can receive services of the Visited SP, wherein the class agreed between the Home SP and the Visited SP; receiving, by the Home SP, a roaming response message from the Visited SP based on the roaming request message, wherein the roaming response message includes the allowed scope of service.