Mobile station and mobile communication system

Abstract

To perform an appropriate transmission power control, when a plurality of RACH procedures simultaneously start, a mobile station UE according to the present invention includes a controlling unit 13 that performs, in “Inter-eNB CA”, when a plurality of RACH procedures are started, a prioritized control based on a predetermined rule on a transmission power control in each of the plurality of RACH procedures.

1 . A mobile station capable of performing a simultaneous communication using component carriers that are under the control of a master radio base station and a secondary radio base station, comprising:
 a controlling unit that, in the simultaneous communication, when a plurality of random access procedures are started, and when simultaneous transmission of random access preambles occurs in the plurality of random access procedures, performs a ramping control on a transmission power of a random access preamble in a random access procedure that is given priority and does not perform the ramping control on a transmission power of a random access preamble in the random access procedure other than the random access procedure that is given priority.   
     
     
         2 .- 3 . (canceled) 
     
     
         4 . The mobile station as claimed in  claim 1 , wherein the controlling unit gives priority to a transmission power control in a random access procedure in a primary cell. 
     
     
         5 . The mobile station as claimed in  claim 1 , wherein the controlling unit gives priority to a transmission power control in a non-contention based random access procedure. 
     
     
         6 . A mobile station capable of performing a simultaneous communication using component carriers that are under the control of a master radio base station and a secondary radio base station, comprising:
 a controlling unit that, in the simultaneous communication, when a plurality of random access procedures are started,   gives priority to a transmission power control in a random access procedure for CCCH.   
     
     
         7 . (canceled) 
     
     
         8 . A mobile station capable of performing a simultaneous communication using component carriers that are under the control of a master radio base station and a secondary radio base station, comprising:
 a controlling unit that, in the simultaneous communication, when a plurality of random access procedures are started, and when simultaneous transmission of random access preambles occurs in the plurality of random access procedures, does not transmit a random access preamble in a random access procedure other than the random access procedure that is given priority.   
     
     
         9 . (canceled) 
     
     
         10 . (canceled)