Patent ID: 8228892

Claim:
A synchronous delivery method of transmitting delivery data to radio terminals via a plurality of base stations by an aggregation device in synchronization with an identical time information in a radio communication system having the plurality of base stations and the aggregation device for aggregating the plurality of base stations, wherein the plurality of base stations transmit, to the aggregation device, a path setting request including a period number corresponding to a transmitting time when the delivery data is divided into constant periods and transmitted, number of transmittable bytes within one period, a transmission start time of the aggregation device corresponding to a predetermined period number added to a transmission packet, and key information for the synchronous delivery, respectively, the aggregation device receives the path setting request to transmit, to the plurality of base stations, respectively, a path setting response including the period number used for a data delivery and a time corresponding to a leading time of a period for the period number, and sets a path for transmitting data from the aggregation device to the respective base stations, the aggregation device adds, to respective packets to deliver the delivery data, the period number and a sequence number indicating a transmission location within the period indicated by the period number, which become a base for calculating time information to be transmitted on a radio, to transmit the packets to the plurality of base stations, and the plurality of base stations calculate the time information to be transmitted on the radio to the radio terminals in accordance with the period number and sequence number added to a received packet, respectively, to synchronize with calculated identical time information and deliver the packet of the delivery data.