Patent ID: 7532578

Claim:
A communication system for transmitting multicast data to a plurality of mobile stations joining in a multicast group, the system comprising: a category manager configured to store a reception capability value showing a reception capability necessary for receiving multicast data in each of the mobile stations and a category corresponding to the reception capability; a reception capability collector configured to collect reception capability values of each of the mobile stations regardless of whether each of the mobile stations receives the multicast data, prior to transmission of the multicast data, wherein the reception capability value of each of the mobile stations is defined by at least one of a demodulation method, a reception buffer size, a processing capability, a decoding method, a interleaving length, a number of despreaders and a number of decoders; a transmitter configured to transmit the multicast data using a transmission method corresponding to a first category and a transmission method corresponding to a second category, when both a reception capability value corresponding to the first category and a reception capability value corresponding to the second category are collected by the reception capability collector.