Mobile communication method and mobile station

Abstract

A mobile communication method includes the steps of transmitting a first control signal including an identifier different from a C-RNTI to the mobile station UE#A through a FDCCH by a radio base station PhNB# 10 managing a cell # 10 formed by linking multiple small cells, transmitting a second control signal including an identifier to the mobile station UE through a PDCCH by a radio base station eNB# 1 managing a cell # 1 having a coverage area overlapping with a coverage area of the cell # 10 , and regarding the first control signal as valid by the mobile station UE#A, when it determines that the identifier included in the first control signal and the identifier included in the second control signal match each other.

1 . A mobile communication method, comprising steps of:
 transmitting, by a first radio base station managing a cell formed with a plurality of small cells, an identifier to a second radio base station managing a macro cell having a coverage area overlapping with a coverage area of the cell;   transmitting, by the second radio base station, a control signal including the identifier to a mobile station through a physical downlink control channel; and   performing, by the mobile station, a random access procedure with the first radio base station based on the identifier.   
     
     
         2 . A mobile station capable of communicating with a first radio base station managing a cell formed with a plurality of small cells and a second radio base station managing a macro cell having a coverage area overlapping with a coverage area of the cell, the mobile station comprising:
 a receiver that receives from the second radio base station through a physical downlink control channel, a control signal including an identifier transmitted from the first radio base station; and   a processor that performs a random access procedure with the first radio base station based on the identifier.   
     
     
         3 . A mobile communication method; comprising steps of:
 transmitting, by a first radio base station managing a cell formed with a plurality of first cells, an identifier to a second radio base station managing a second cell having a coverage area overlapping with a coverage area of the cell;   transmitting, by the second radio base station, a control signal including the identifier to a mobile station through a physical downlink; control channel; and   performing, by the mobile station, a random access procedure with the first radio base station based on the identifier.