Base station apparatus and communication control method

Abstract

A base station apparatus capable of communicating with a user equipment terminal using an uplink shared channel includes a radio resource allocation unit configured to decrease frequency resources allocated to the shared channel, when transmission power of the user equipment terminal is less than a predetermined threshold.

1 - 11 . (canceled) 
     
     
         12 . A base station apparatus capable of communicating with a user equipment terminal using an uplink shared channel, comprising:
 a calculation unit configured to calculate path loss between the user equipment terminal and the base station apparatus;   an MCS selection unit configured to select an MCS level of the shared channel based on the path loss;   a determination unit configured to determine a transmission scheme to be used for transmitting the shared channel based on the MCS level and a radio resource available for the shared channel; and   a notification unit configured to notify the user equipment terminal of the determined transmission scheme.   
     
     
         13 . (canceled) 
     
     
         14 . The base station apparatus as claimed in  claim 12 , wherein:
 the MCS selection unit selects the MCS level of the shared channel based on the path loss, radio quality of a sounding reference signal, and target radio quality of the sounding reference signal.   
     
     
         15 . (canceled) 
     
     
         16 . The base station apparatus as claimed in  claim 12 , wherein:
 the determination unit decreases the amount of frequency resources which is determined as the transmission scheme, when either the amount of data in a buffer of the user equipment terminal or the maximum amount of data which can be transmitted by the user equipment terminal is below a data size which is determined as the transmission scheme.   
     
     
         17 . A communication control method in a base station apparatus capable of communicating with a user equipment terminal using an uplink shared channel, comprising the steps of:
 calculating path loss between the user equipment terminal and the base station apparatus;   selecting an MCS level of the shared channel based on the path loss, radio quality of a sounding reference signal, and target radio quality of the sounding reference signal;   determining a transmission scheme to be used for transmitting the shared channel based on the MCS level and a radio resource available for the shared channel; and   notifying the user equipment terminal of the determined transmission scheme.