Patent ID: 6965580

Claim:
A radio base station device, comprising: a reception unit configured to receive a connection request from one radio terminal; a first allocation unit configured to allocate a first media access control identifier which is an unused media access control identifier, to said one radio terminal that issued the connection request; a broadcast unit configured to broadcast a correspondence between tie first media access control identifier and said one radio terminal; a second allocation unit configured to allocate a second media access control identifier to an identifier of a multicast information that are to be received by a plurality of radio terminals; a first transmission unit configured to transmit a correspondence information for enabling said plurality of radio terminals to recognize a correspondence between the second media access control identifier and the identifier of the multicast information; a second transmission unit configured to transmit a time-slot corresponding to the first media access control identifier with a user information destined to said one radio terminal loaded thereon, and a time-slot corresponding to the second media access control identifier with the multicast information loaded thereon; and a set up unit configured to set up a datalink connection with respect to said one radio terminal, wherein the second allocation unit allocates a set of the second media access control identifier and a datalink connection identifier to the identifier of the multicast information, the first transmission unit transmits the correspondence information regarding a correspondence between the identifier of the multicast information and the set of the second media access control identifier and the datalink connection identifier, and the second transmission unit transmits a time-slot corresponding to the set of the second media access control identifier and the datalink connection identifier with the multicast information loaded thereon.