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Mobile user's needs for seamless services are currently increasing. Users change their location by moving and use services. At this time, if a new target cell does not have sufficient resource for the service, the service can not be continuous. For solving this problem, we propose a seamless service support scheme to improve service continuity. The proposed scheme increases handover feasibility by using classified service with several classes. As analytical result, we show that the performance of the handover blocking probability in the proposed scheme is better than that of the existing scheme.