Patent ID: 6975885

Claim:
A mobile broadcast communication system comprising: a base station comprising broadcast communication data sending means for dividing a frame of a signal to be sent via a high-speed downlink channel into a plurality of subchannels, allotting each of broadcast communication data of different channels for broadcast communication to a particular subframe, executing spectrum spread with said broadcast communication data in a single frequency band by using a particular spread code, and sending said broadcast communicated data subjected to spectrum spread, receipt quality determining means for sending the broadcast communication data output from said broadcast communication data sending means to a particular receiving station, which desires to receive the broadcast communication data belonging to one of said subframes, causing said receiving station to decode said broadcast communication data by using an inverse spread code inverse to said spread code, and then determining receipt quality of said receiving station, and subframe format notifying means for notifying, if receipt quality determined by said receipt quality determining means is higher than a reference value set in said receiving station beforehand, said receiving station of a format of the subframe necessary for decoding the broadcast communication data desired by said receiving station; and a mobile terminal comprising connection requesting means for requesting, when said mobile terminal desires to receive the broadcast communication data belonging to the one subframe, said base station to send said broadcast communication data, receipt quality data sending means for decoding, on receiving from said base station the inverse spread code and a frame of a signal sent via the high-speed downlink channel as an answer to a connection request, a signal received from said base station by using said inverse spread code and said frame of said signal and then sending a result of decoding meant for said receipt quality determining means to said base station, and decoding means for selecting, on receiving the format of the subframe from said subframe format notifying means of said base station, the desired subframe and then decoding the broadcast communication data of the channel by using said inverse spread code.