Patent ID: 7110767

Claim:
A paging method in a mobile communication system including a plurality of base stations connected to an IP network, a plurality of mobile stations located in a cell formed by base stations, and a server, connected to the IP network, comprising a location information management table storing location information of the mobile stations including a connection state, wherein a set of cells formed by base stations constitutes a paging area, and wherein said server manages information of a mobile station in standby as location information of mobile stations about a paging area in which the mobile stations are located; said method comprising: transferring a packet transmitted from a base station to a mobile station, to said server; determining by said server receiving the packet, according to the location information management table, whether the mobile station is in a standby state or not; copying the packet by said server, if the mobile station is in the standby state, from the server to the number of base stations corresponding to a paging area in which the mobile station has registered its location; and multicasting by said server said packets obtained by the step of copying to said base stations corresponding to the paging area.