Base station apparatus and radio communication method
View Patent ↗An SIR information extracting section 106 extracts SIR measured at a communication terminal from the received data, and a fluctuation amount calculating section 109 calculates a fluctuation amount of SIR between time at which the communication terminal has measured SIR and transmission starting time of DSCH data using a TPC command, and a transmission system determining section 110 adds the SIR fluctuation amount calculated in the fluctuation amount calculating section 109 to the SIR measured at the communication terminal and estimates SIR of DSCH data so as to determine an optimal transmission system of DSCH data according to the estimated SIR.
1. A base station apparatus, comprising:
a capturer that captures channel quality information about downlink channel qualities measured at a plurality of communication terminals respectively;
a receiver that receives TPC commands from said plurality of communication terminals;
a calculator that calculates an amount of fluctuation in the downlink channel quality measured at each of said communication terminals with reference to the TPC command from each of said communication terminals;
a compensator that compensates the channel quality information corresponding to each of said communication terminals with reference to the amount of fluctuation at each of said communication terminals; and
a selector that compares the compensated channel quality information corresponding to each of said communication terminals and, based on a comparison result, determines a transmission destination communication terminal.
2. The base station apparatus according to claim 1 , wherein:
after the capturer captures the channel quality information for each of said communication terminals, the calculator adds the TPC commands received by the receiver to produce an added result and assigns the added result to the amount of fluctuation at each of said communication terminals; and
the compensator adds the amount of fluctuation at each of said communication terminals to the channel quality information corresponding to each of said communication terminals to compensate the captured channel quality information.
3. The base station apparatus according to claim 1 , further comprising a determiner that determines a modulating scheme and a coding scheme, for transmission of data to the selected transmission destination communication terminal, according to the compensated channel quality information of the transmission destination communication terminal.
4. A radio communication method, comprising:
capturing channel quality information about downlink channel qualities measured at a plurality of communication terminals respectively;
receiving TPC commands from said plurality of communication terminals;
calculating an amount of fluctuation in the downlink channel quality at each communication terminal with reference to a TPC command from said each communication terminal;
compensating the channel quality information corresponding to said each communication terminal with reference to the amount of fluctuation at said each communication terminal;
comparing the compensated channel quality information corresponding to each of said plurality of communication terminals; and
determining a transmission destination communication terminal based on a comparison result.