Mobile station, base station, uplink transmission method, and downlink transmission method

Abstract

A mobile station includes a channel quality estimation unit configured to estimate downlink channel quality based on a reference signal from a base station and to output the estimated downlink channel quality as channel estimation information; an acknowledgement information determining unit configured to determine whether a downlink data channel from the base station is correctly received and to output the determination result as acknowledgement information; and an acknowledgement information prioritizing unit configured to cause the acknowledgement information to be preferentially transmitted to the base station if transmission timings of the channel estimation information and the acknowledgement information coincide.

1 .- 3 . (canceled) 
     
     
         4 . A base station, comprising:
 a frame management unit configured to manage frame information indicating a frame where a mobile station transmits, via uplink, acknowledgement information for at least a data channel transmitted via downlink; and   an allocation information signal generating unit configured to generate uplink radio resource allocation information based on the frame information.   
     
     
         5 . The base station as claimed in  claim 4 , further comprising:
 a determining unit configured to determine, based on the frame information, a timing when transmission timings of channel estimation information and the acknowledgement information from the mobile station coincide in the same frame.   
     
     
         6 . The base station as claimed in  claim 5 , wherein the determining unit is configured to count a number of times when the transmission timings of the channel estimation information and the acknowledgement information from the mobile station coincide in the same frame and when the number of times reaches a predetermined value, to output a signal requesting to stop or postpone transmission of data. 
     
     
         7 . The base station as claimed in  claim 5 , wherein when the determining unit determines the timing at which the transmission timings of the channel estimation information and the acknowledgement information from the mobile station coincide in the same frame, the allocation information signal generating unit is configured to generate the uplink radio resource allocation information that causes the mobile station to transmit the channel estimation information and the acknowledgement information via an uplink data channel. 
     
     
         8 .- 9 . (canceled)