Patent ID: 7254132

Claim:
A mobile communication system comprising: a wireless base station configured to communicate according to an Internet Protocol (IP) network control protocol operating on the Internet; a mobile station configured to communicate according to the IP network control protocol operating on the Internet; said mobile station comprises an adding section configured to add ID information to existing IP packet control information in a control information of a first IP packet to be transmitted to said wireless base station, said ID information indicating that broadcasting or multicasting should be carried out, and a transmitting section configured to wirelessly transmit the first IP packet to said wireless base station; and said wireless base station comprises a base station receiving section configured to receive the first IP packet from the mobile station, a first determining section configured to determine whether a second IP packet should be broadcast or multicast based on the ID information in the first IP packet received from said mobile station, a copying section configured to copy said first IP packet to produce the second IP packet according to a subnet to be transmitted when the first determining section determines that the second IP packet should be broadcast or multicast, and a base station transmitting section configured to wirelessly broadcast or multicast said second IP packet to a mobile station within a cell corresponding to said subnet.