Base station apparatus and radio communication method

Abstract

A base station transmits downlink signals to mobile terminals of users A to C with respective transmission power corresponding to downlink quality. A downlink quality estimating section ( 106 ) uses the transmission power from a transmission power control section to compare transmission power between the users, and estimates that a terminal with low transmission power has high downlink quality. The priorities are determined so that the priority is increased as the transmission power is lower. Thus determined priority information is output to a scheduling section ( 107 ). The scheduling section ( 107 ) performs scheduling based on the priority information. The section ( 107 ) assigns DSCH to terminals in ascending order of transmission power. User A is first assigned DSCH, user B is second assigned DSCH, and user C is third assigned DSCH. It is thus possible to perform scheduling and MCS selection of DSCH with the need of information from a terminal eliminated.

1 - 12 . (canceled)  
     
     
         13 . A base station apparatus comprising: 
 a monitoring section that is adapted to measure, for each of a plurality of communication terminals, transmission power of a dedicated channel associated with a shared channel which is shared by the plurality of communication terminals;    a selection section that is adapted to select a modulation scheme and a coding rate of the shared channel based on the result of the measurement in the monitoring section;    a coding section that is adapted to code a signal using the selected coding rate; and    a modulation section that is adapted to modulate the signal using the selected modulation scheme.    
     
     
         14 . The based station apparatus according to  claim 13 , wherein the dedicated channel is DPCH (dedicated physical channel) and the shared channel is SDCH (downlink shared channel).  
     
     
         15 . The base station apparatus according to  claim 13 , further comprising: 
 a scheduling section that is adapted to perform scheduling for the shared channel based on the result of the measurement in the monitoring section.    
     
     
         16 . The base station apparatus according to  claim 13 , further comprising: 
 a transmission power control section that is adapted to correct the transmission power of the dedicated channel using information obtained by upper layer signaling.    
     
     
         17 . A MCS (modulation and coding scheme) selection method in a mobile communication system said method comprising: 
 (a) measuring, for each of a plurality of communication terminals, transmission power of a dedicated channel associated with a shared channel which is shared by the plurality of communication terminals;    (b) selecting a modulation scheme and a coding rate of the shared channel based on the result of the measurement in the step (a);    (c) coding a signal using the selected coding rate; and    (d) modulating the signal using the selected modulation scheme.