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-carriers based on sub-carrier quantity information received from a base station. The method comprises: acquiring information indicating a number of sub-carriers; measuring channel quality of each of a plurality of sub-carriers within a communication band from a received signal; selecting sub-carriers satisfying a condition related to measured channel quality bands from the plurality of sub-carriers, wherein quantity of the selected sub-carriers corresponds to the quantity of sub-carriers indicated by the acquired information; and transmitting information indicating channel quality of the selected sub-carriers.
1. A wireless communication apparatus comprising:
circuitry configured to:
acquire information indicating a number of subcarriers;
measure channel quality of each of a plurality of sub-carriers within a communication band from a received signal;
select sub-carriers satisfying a condition related to measured channel quality from the plurality of sub-carriers, wherein quantity of the selected sub-carriers corresponds to the quantity of sub-carriers indicated by the 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 positions of the selected sub-carrier bands according to the modulation scheme; and
transmit the second information indicating the channel quality of the selected sub-carriers.
2. The wireless communication apparatus according to claim 1 , wherein the circuitry is configured to select the indicated number of sub-carriers in descending order of measured channel quality.
3. The wireless communication apparatus according to claim 1 , wherein the circuitry is further configured:
to modulate the second information indicating channel quality of the selected sub-carriers according to a modulation scheme;
to spread the second information indicating channel quality of the selected sub-carriers using a spreading code specific to each user, and
to transmit the spread second information.
4. The wireless communication apparatus according to claim 3 , wherein the circuitry is further configured:
to modulate the third information indicating positions of the selected sub-carriers according to the modulation scheme;
to spread the third information indicating positions of the selected sub-carriers using a spreading code specific to each user; and
to transmit the spread third information.
5. The wireless communication apparatus according to claim 1 , wherein the wireless communication apparatus is a mobile station; wherein the information indicating the number of sub-carriers is acquired from a base station; and wherein the information indicating the channel quality of the selected sub-carriers is transmitted to the base station.
6. A wireless communication method comprising:
acquiring information indicating a number of sub-carriers;
measuring channel quality of each of a plurality of sub-carriers within a communication band from a received signal;
selecting sub-carriers satisfying a condition related to measured channel quality bands from the plurality of sub-carriers, wherein quantity of the selected sub-carriers corresponds to the quantity of sub-carriers indicated by the acquired information; and
transmitting the information indicating channel quality of the selected sub-carriers.
7. The wireless communication method according to claim 6 further comprising selecting the indicated number of sub-carriers in descending order of measured channel quality.
8. The wireless communication method according to claim 6 , further comprising:
modulating the second information indicating channel quality of the selected sub-carriers according to a modulation scheme;
spreading the second information indicating channel quality of the selected sub-carriers using a spreading code specific to each user; and
transmitting the spread second information.
9. The wireless communication method according to claim 8 , further comprising:
modulating the third information indicating positions of the selected sub-carriers according to the modulation scheme;
spreading the third information indicating positions of the selected sub-carriers using a spreading code specific to each user; and,
transmitting the spread third information.
10. The wireless communication method according to claim 6 , wherein the wireless communication apparatus is a mobile station; and further comprising:
acquiring the information indicating the number of sub-carriers from a base station; and
transmitting the information indicating the channel quality of the selected sub-carriers to the base station.