Wireless communication apparatus and wireless communication method
A wireless communication apparatus is capable of improving communication efficiency by reducing the amount of control information transmitted. A channel quality information extraction section extracts CQI's from a received signal. An allocation control section allocates subcarriers for every communication terminal apparatus and selects a modulation scheme in such a manner that required transmission rate is satisfied for each communication terminal apparatus based on required transmission rate information, etc. and CQI's for communication terminal apparatus of each user. A required subcarrier number determining section decides the number of subcarriers allocated to every communication terminal apparatus so as to satisfy the required transmission rate for each communication terminal apparatus. A required subcarrier number information generating section generates information for the number of subcarriers allocated to every communication terminal apparatus. A subcarrier allocation section allocates packet data to selected subcarriers. Modulating sections adaptively modulate packet data allocated to each subcarrier.
1. A communication apparatus, comprising:
a transmitter, which, in operation, transmits control information to a terminal, the control information including an indication to the terminal selected from a plurality of indications, the plurality of indications including:
an indication to transmit a first set of channel quality indicators (CQIs) representing channel qualities for all subcarriers in a communication band; and
an indication to transmit a second CQI representing channel quality for subcarriers selected among the all subcarriers and position information of the selected subcarriers, wherein a first data volume associated with the second CQI and the position information is less than a second data volume associated with the first set of CQIs; and
a receiver, which, in operation, receives, from the terminal based on the indication included in the transmitted control information, one of:
the first set of CQIs; and
the second CQI and the position information.
2. The communication apparatus of claim 1 wherein the selected indication is based in part on the first data volume associated with the second CQI and the position information.
3. The communication apparatus of claim 1 wherein the control information includes:
information related to a quantity of subcarriers to be selected among the all subcarriers.
4. A method, comprising:
transmitting, by a communication apparatus, control information to a terminal, the control information including an indication to the terminal selected from a plurality of indications, the plurality of indications including:
an indication to transmit a first set of channel quality indicators (CQIs) re channel qualities for all subcarriers in a communication band; and
an indication to transmit a second CQI representing channel quality for subcarriers selected among the all subcarriers in the communication band and position information of the selected subcarriers, wherein a first data volume associated with the second CQI and the position information is less than a second data volume associated with the first set of CQIs; and
receiving, by the communication apparatus from the terminal based on the indication included in the transmitted control information, one of:
the first set of CQIs; and
the second CQI and the position information.
5. The method of claim 4 wherein the control information includes:
information related to a quantity of subcarriers to be selected among the all subcarriers.
6. The method of claim 4 wherein the selected indication is based in part on the first data volume associated with the second CQI and the position information.
7. A system, comprising:
means for transmitting control information to a terminal, the control information including an indication to the terminal selected from a plurality of indications, the plurality of indications including:
an indication to transmit a first set of channel quality indicators (CQIs) representing channel qualities for all subcarriers in a communication band; and
an indication to transmit a second CQI representing channel quality for subcarriers selected among the all subcarriers in the communication band and position information of the selected subcarriers, wherein a first data volume associated with the second CQI and the position information is less than a second data volume associated with the first set of CQIs; and
means for receiving, from the terminal based on the indicating included in the transmitted control information, one of:
the first set of CQIs; and
the second CQI and the position information.
8. The system of claim 7 wherein the selected indication is based in part on the first data volume associated with the second CQI and the position information.
9. The system of claim 7 wherein the control information includes:
information related to a quantity of subcarriers to be selected among the all subcarriers.