Radio transmission device and method
A radio transmitting device and method enables reduction of an increase of CGI memories for the control channel and an improvement of the throughput of the data channel. When multiplex transmission through the control channel and the data channel is carried out and when adaptive modulation is applied to both channels, an MCS selecting section ( 108 ) is provided with one CQI table for the data channel and CQI tables for the control channel, and a table selecting MCS determining section ( 201 ) selects one of the tables depending on the transmission bandwidth of the terminal and determines the MCS of the control channel while looking up the selected CQI table.
1. A radio transmission apparatus comprising:
a coding unit configured to code one form of control data using a modulation and coding scheme (MCS) for a data channel and an offset value, the offset value being set for said one form of the control data; and
a radio transmitting unit configured to transmit data in the data channel and said one form of the control data coded with a coding rate according to said one form of the control data.
2. The radio transmission apparatus according to claim 1 , wherein said coding unit is configured to code a first form of control data using the MCS for the data channel and an offset value for the first form of the control data, and to code a second form of control data using the MCS for the data channel and an offset value for the second form of the control data.
3. The radio transmission apparatus according to claim 2 , wherein a coding rate used to code said first form of control data is different from a coding rate used to code said second form of control data.
4. The radio transmission apparatus according to claim 1 , wherein said coding unit codes said one form of the control data using a MCS determined based on the MCS for the data channel and the offset value.
5. The radio transmission apparatus according to claim 1 , wherein said one form of the control data is ACK/NACK or channel quality indicator (CQI).
6. The radio transmission apparatus according to claim 1 , wherein said transmitting unit multiplexes and transmits the data and said one form of the coded control data.
7. The radio transmission apparatus according to claim 1 , further comprising a receiving unit configured to receive control information, wherein said coding unit determines the MCS for the data channel based on the received control information.
8. The radio transmission apparatus according to claim 7 , wherein said coding unit codes said one form of the control data using the received control information and the offset value.
9. The radio transmission apparatus according to claim 7 , wherein said coding unit codes said one form of the control data based on control information, into which the received control information is adjusted based on the offset value.
10. The radio transmission apparatus according to claim 7 , wherein the control information is channel quality indicator (CQI).
11. The radio transmission apparatus according to claim 1 , wherein the offset value is given by multiplying a predetermined offset value with a factor for said one form of the control data.
12. The radio transmission apparatus according to claim 1 , wherein the offset value is associated with a parameter of the radio transmission apparatus.
13. The radio transmission apparatus according to claim 12 , wherein the parameter is a transmission bandwidth, scheduling scheme, frequency hopping or a number of retransmissions.
14. A radio transmission method comprising:
coding one form of control data using a modulation and coding scheme (MCS) for a radio data channel and an offset value, the offset value being set for said one form of the control data; and
transmitting data in the radio data channel and said one form of the control data coded with a coding rate according to said one form of the control data.