Channel structure, method forming the same, radio base station, mobile station in mobile communication system

A method for forming a channel structure of a mobile communication system including a radio base station having a transmission antenna able to control a beam direction for each of a plurality of mobile stations in a cell, said mobile stations carrying out radio communication using a shared channel together with an associated dedicated channel used in association with said shared channel, said shared channel being shared by said mobile stations and allocated to each of said mobile stations per predetermined unit transmission, comprising the steps of:

• setting a first pilot channel dedicatedly used for channel estimation of said shared channel;
• and
• setting a second pilot channel dedicatedly used for channel estimation of said associated dedicated channel.

A radio base station for transmitting downlink packet data to a plurality of mobile stations by using a shared channel together with an associated dedicated channel used in association with the shared channel, said shared channel being shared by said mobile stations and allocated to each said mobile station per predetermined unit transmission, comprising:

• a pilot channel setting unit for dedicatedly setting a first pilot channel used for channel estimation of said shared channel, and a second pilot channel used for channel estimation of said associated dedicated channel.

A mobile station for carrying out radio communication with a radio base station by using a shared channel together with an associated dedicated channel used in association with the shared channel, said shared channel being shared by a plurality of said mobile stations and allocated to each said mobile station per predetermined unit transmission, comprising:

• a channel estimation unit for receiving a dedicated pilot channel from said radio base station and using the dedicated pilot channel for channel estimation of said shared channel and said associated dedicated channel.