Multicast communication method in a cdma mobile communication system

Abstract

A multicast communication method in a CDMA mobile communication system is disclosed, which is capable of reducing a transmission power in a base station system and performing an efficient multicast operation for a large number of mobile subscribers is provided. Starting of information distribution by a multicast operation and identification information indicating a content of the information thereof are notified through a broadcast channel to a mobile subscriber. Through the broadcast channel, information necessary for actual reception of communication data is notified. In the mobile subscriber, a surround environment of the mobile subscriber is checked to determine the possibility of simultaneous receiving from a plurality of other base station systems. If possible, similar notified information is also received from other base station systems. Thus, all kinds of information regarding the spread code or the like to be used for receiving distributed information are obtained.

What is claimed is: 
     
         1 . A first base station comprising:
 a receiver configured to receive, from a second base station, configuration data needed for the first base station and the second base station to interoperate over an interface between the first base station and the second base station; and   a transmitter configured to perform a data transmission to a mobile station simultaneously with the second base station based on the configuration data.   
     
     
         2 . The first base station according to  claim 1 , wherein the data transmission to the mobile station enables the mobile station in a cell edge to improve a received signal quality. 
     
     
         3 . A mobile station comprising:
 A receiver configured to perform a data reception from a first base station simultaneously with a second base station based on a configuration data, wherein the first base station receives, from the second base station, the configuration data needed for the first base station and the second base station to interoperate over an interface between the first base station and the second base station.   
     
     
         4 . The mobile station according to  claim 3 , wherein the data reception enables the mobile station in a cell edge to improve a received signal quality.