Wireless communication apparatus and wireless communication method
View Patent ↗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 receiver, which, in operation, receives control information, the control information including an indication 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
circuitry, which, in operation, generates, based on the indication included in the received 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 control information is based in part on the first data volume.
3. The communication apparatus of claim 1 , comprising:
a transmitter, which, in operation, transmits one of:
the first set of the CQIs without the position information; and
the second CQI and the position information.
4. The communication apparatus of claim 1 wherein the control information includes information related to a quantity of subcarriers to be selected among all subcarriers in the communication band.
5. A method, comprising:
receiving control information, the control information including an indication 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
generating, based on indication included in the received control information, one of:
the first set of CQIs; and
the second CQI and the position information.
6. The method of claim 5 wherein the control information is based in part on the first data volume.
7. The method of claim 5 , comprising:
transmitting one of:
the first set of CQIs without the position information; and
the second CQI and the position information.
8. The method of claim 5 wherein the control information includes information related to a quantity of subcarriers to be selected among all subcarriers in the communication band.