Base station apparatus and radio communication method for receiving information indicative of channel quality from mobile station
A wireless communication method and apparatus are provided for selecting quality-reporting sub-carrier bands based on sub-carrier band quantity information received from a base station. The method includes generally four steps. First, from a base station, information indicating quantity of sub-carrier bands is acquired. Second, channel quality of each of a plurality of sub-carrier bands within a communication band is measured from a received signal. Third, sub-carrier bands are selected from the plurality of sub-carrier bands, wherein quantity of the selected sub-carrier bands corresponds to the quantity of sub-carrier bands indicated by the acquired information. Fourth, information indicating channel quality of the selected sub-carrier bands is reported to the base station.
1. A wireless communication apparatus comprising:
a radio receiver configured to acquire, from a base station, a first information indicating a fixed number identifying a quantity of sub-carrier bands to be selected for channel quality reporting;
an integrated circuit configured to:
measure channel quality of each of a plurality of sub-carrier bands within a communication band from a received signal;
select sub-carrier bands from the plurality of sub-carrier bands based on the measured channel quality, wherein quantity of the selected sub-carrier bands matches the quantity of sub-carrier bands identified by the fixed number indicated by the first acquired information;
a modulator configured to modulate a second information indicating channel quality of the selected sub-carrier bands according to a modulation scheme and a third information indicating the selected sub-carrier bands according to the modulation scheme; and
a radio transmitter configured to report to the base station the second and third modulated information.
2. The wireless communication apparatus according to claim 1 , wherein the integrated circuit is further configured to select the indicated fixed number of sub-carrier bands in descending order of the measured channel quality.
3. The wireless communication apparatus according to claim 1 , wherein the radio transmitter is further configured to spread the second information indicating channel quality of the selected sub-carrier bands using a spreading code specific to each user, and report the spread second information.
4. The wireless communication apparatus according to claim 1 , wherein the radio transmitter is further configured to spread the third information using a spreading code specific to each user, and report the spread third information.
5. The wireless communication apparatus according to claim 1 , wherein the second information indicating channel quality of the selected sub-carrier bands is channel quality information (CQI).
6. The wireless communication apparatus according to claim 5 , wherein the CQI is generated based on comparison between a channel quality measurement value and predetermined regions of channel quality measurement values respectively indicating different CQIs.
7. The wireless communication apparatus according to claim 1 , wherein the second information indicates an aggregation of the channel quality of each of the selected sub-carrier bands.
8. The wireless communication apparatus according to claim 1 , wherein the radio transmitter is further configured to multiplex the second and third modulated information with an Acknowledgement/Negative Acknowledgement (ACK/NACK) signal for reporting to the base station.
9. The wireless communication apparatus according to claim 1 , wherein the integrated circuit comprises processor circuitry.
10. A wireless communication method comprising:
using a receiver to acquire, from a base station, a first information indicating a fixed number identifying quantity of sub-carrier bands to be selected for channel quality reporting;
using an integrated circuit to:
measure channel quality of each of a plurality of sub-carrier bands within a communication band from a received signal;
select sub-carrier bands from the plurality of sub-carrier bands based on the measured channel quality, wherein quantity of the selected sub-carrier bands matches the quantity of sub-carrier bands identified by the fixed number indicated by the first acquired information;
modulate a second information indicating channel quality of the selected sub-carrier bands according to a modulation scheme and a third information indicating the selected sub-carrier bands according to the modulation scheme; and
using a transmitter to report to the base station the second and third modulated information.
11. The wireless communication method according to claim 10 , further comprising selecting the indicated fixed number of sub-carrier bands in descending order of the measured channel quality.
12. The wireless communication method according to claim 10 , further comprising spreading the second information indicating channel quality of the selected sub-carrier bands using a spreading code specific to each user, wherein the reporting includes reporting of the spread second information.
13. The wireless communication method according to claim 10 , further comprising spreading the third information using a spreading code specific to each user, wherein the reporting includes reporting of the spread third information.
14. The wireless communication method according to claim 10 , wherein the second information indicating channel quality of the selected sub-carrier bands is channel quality information (CQI).
15. The wireless communication method according to claim 14 , wherein the CQI is generated based on comparison between a channel quality measurement value and predetermined regions of channel quality measurement values respectively indicating different CQIs.
16. The wireless communication method according to claim 10 , wherein the second information indicates an aggregation of the channel quality of each of the selected sub-carrier bands.
17. The wireless communication method according to claim 10 , further comprising multiplexing the second and third modulated information with an Acknowledgement/Negative Acknowledgement (ACK/NACK) signal before reporting to the base station.
18. A wireless communication apparatus comprising:
a radio receiver configured to acquire, from a base station, signals and a first information indicating a fixed number identifying quantity of sub-carrier bands to be selected for channel quality reporting;
a hardware circuit configured to
measure channel quality of each of a plurality of sub-carrier bands within a communication band from the received signals;
select sub-carrier bands from the plurality of sub-carrier bands, wherein quantity of the selected sub-carrier bands matches the quantity of sub-carrier bands identified by the fixed number indicated by the first acquired information;
a modulator configured to modulate a second information indicating channel quality of the selected sub-carrier bands according to a modulation scheme and a third information indicating the selected sub-carrier bands according to the modulation scheme; and
a radio transmitter configured to report to the base station the second and third modulated information.
19. The wireless communication apparatus according to claim 18 , wherein the hardware circuitry if further configured to select the indicated fixed number of sub-carrier bands in descending order of measured channel quality.
20. The wireless communication apparatus according to claim 18 , wherein the radio transmitter is further configured to spread the second information indicating channel quality of the selected sub-carrier bands using a spreading code specific to each user, and report the spread second information.
21. The wireless communication apparatus according to claim 18 , wherein the radio transmitter is further configured to spread the third information using a spreading code specific to each user, and report the spread third information.
22. The wireless communication apparatus according to claim 18 , wherein the integrated circuit comprises processor circuitry.
23. A wireless communication method comprising:
using a radio receive to acquire, from a base station, a first information indicating a fixed number identifying quantity of su b-carrier bands to be selected for channel quality reporting;
using hardware circuit to:
measure channel quality of each of a plurality of sub-carrier bands within a communication band from a received signal;
modulate a second information indicating channel quality of the selected sub-carrier bands according to a modulation scheme and a third information indicating the selected sub-carrier bands according to the modulation scheme; and
using a radio transmitter to report to the base station the second and third modulated information.
24. The wireless communication method according to claim 23 , further comprising selecting the indicated fixed number of sub-carrier bands in descending order of measured channel quality.
25. The wireless communication method according to claim 23 , further comprising spreading the second information indicating channel quality of the selected sub-carrier bands using a spreading code specific to each user, wherein the reporting includes reporting of the spread second information.
26. The wireless communication method according to claim 23 , further comprising spreading the third information using a spreading code specific to each user, wherein the reporting includes reporting of the spread third information.