Patent ID: 8351389

Claim:
A communication system comprising: mobile stations that receive multicast data and paging announce, wherein the paging announce is received using a discontinuously received frame; a communication apparatus that includes: a searching unit that searches for mobile stations in idle mode from among the mobile stations, wherein the mobile stations in idle mode are not registered to any specific base stations, and a selecting unit that selects mobile stations belonging to a paging group, wherein the paging group is a group constituted of one or more base stations from which the mobile stations in idle mode receive the multicast data; a base station that belongs to the paging group includes: an allocating unit that allocates radio resources to the selected mobile stations, the radio resources being for transmitting an uplink signal, and an including unit that includes information of the radio resources allocated by the allocating unit and the multicast data in a radio frame to be transmitted to the selected mobile stations.