METHOD AND SYSTEM FOR CONTROLLING RETRANSMISSION FOR MULTICAST DISTRIBUTION SERVICE, RETRANSMISSION CONTROLLER, RADIO BASE STATION AND RADIO TERMINAL EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To provide a method and a system for controlling a retransmission for a multicast distribution service capable of effectively utilizing radio resources as much as possible, a retransmission controller, a radio base station and radio terminal equipment. SOLUTION: The system for controlling retransmission for the multicast distribution service transmits a retransmission request of information at timing decided by the radio terminal equipment. An information distribution unit informs retransmission information representing information of the retransmission request to the radio terminal equipment in its service area after receiving the retransmission request of the information from the radio terminal equipment in the service area, retransmits information regarding the request at prescribed timing. The radio terminal equipment does not transmits the request of the information when receiving the retransmission information representing the information necessary for the retransmission before reaching the decided timing but receives the information to be retransmitted from the information distribution unit.