Patent ID: 7221674

Claim:
A method for multicasting/broadcasting IP data in a mobile communication system, comprising: a packet data serving node (PDSN) receiving multicast packet data; transforming the multicast packet data to a PPP frame format having an identification header, wherein the identification header includes information for distinguishing at least a multicast message and a broadcast message; transmitting multicast message from the PDSN to base station controller/packet control function (BSC/PCF); the BSC/PCF transmitting multicasting/broadcasting message to all or some of base stations under control of the BSC/PCF according to header information of the multicast message; and transmitting the multicasting/broadcasting message to mobile station through broadcasting channel, wherein the multicast packet data comprises a header information including QoS, multicast/broadcast type, multicast/broadcast group, and length information including body data of the PPP frame format and message body.