Apparatus and method for transmitting and receiving fast feedback information in broadband wireless communication system

1. A method for operating a Mobile Station (MS) in a wireless communication system using a fast feedback channel supporting at least two modes of the fast feedback channel, the method comprising:

generating and transmitting a feedback signal through the fast feedback channel according to a first mode of the fast feedback channel;

determining to switch a feedback mode from the first mode to a second mode of the fast feedback channel;

transmitting a signal for requesting mode switching through the fast feedback channel;

receiving feedback channel allocation information for permitting switching to the second mode from a Base Station (BS), the feedback channel allocation information comprising a feedback period and the second mode to be switched; and

generating and transmitting a feedback signal through the fast feedback channel according to the second mode indicated by the feedback channel allocation information.

2. The method of claim 1 ,

wherein the first mode comprises a mode where the MS transmits a code sequence through the fast feedback channel, and

wherein the second mode comprises a mode where the MS transmits at least one pilot symbol and at least one feedback information symbol through the fast feedback channel.

3. The method of claim 2 , wherein the transmitting of the signal for requesting the mode switching through the fast feedback channel comprises transmitting a code sequence, which is assigned for a request of the mode switching, through the fast feedback channel according to the first mode.

4. The method of claim 1 ,

wherein the first mode comprises a mode where the MS transmits at least one pilot symbol and at least one feedback information symbol through the fast feedback channel, and

wherein the second mode comprises a mode where the MS transmits a code sequence through the fast feedback channel.

5. The method of claim 4 , wherein the transmitting of the signal for requesting the mode switching through the fast feedback channel comprises transmitting a code sequence, which is assigned for a request of the mode switching through the fast feedback channel according to the second mode.

6. The method of claim 4 , further comprising transmitting feedback information comprising an indicator for indicating a switch to the second mode,

wherein the feedback information is transmitted through the fast feedback channel according to the first mode, and

wherein the feedback information is transmitted before the transmitting of the signal for requesting the mode switching.

7. A method for operating a Base Station (BS) in a wireless communication system using a fast feedback channel supporting at least two modes of the fast feedback channel, the method comprising:

detecting feedback information from a feedback signal received through the fast feedback channel according to a first mode of the fast feedback channel;

receiving a signal for requesting mode switching through the fast feedback channel;

transmitting feedback channel allocation information for permitting the mode switching, the feedback channel allocation information comprising a feedback period and a mode to be switched; and

detecting feedback information from the feedback signal received through the fast feedback channel according to a second mode of the fast feedback channel indicated by the feedback channel allocation information.

8. The method of claim 7 , wherein the first mode comprises a mode where a Mobile Station (MS) transmits a code sequence through the fast feedback channel, and

wherein the second mode comprises a mode where the MS transmits at least one pilot symbol and at least one feedback information symbol through the fast feedback channel.

9. The method of claim 8 , wherein a signal for requesting the mode switching is a code sequence which is assigned for a request of the mode switching and the code sequence is detected according to the first mode.

10. The method of claim 7 ,

wherein the first mode comprises a mode where the MS transmits at least one pilot symbol and at least one feedback information symbol through the fast feedback channel, and

wherein the second mode comprises a mode where the MS transmits a code sequence through the fast feedback channel.

11. The method of claim 10 , wherein a signal for requesting the mode switching is a code sequence which is assigned for a request of the mode switching and the code sequence is detected according to the second mode.

12. The method of claim 10 , further comprising receiving feedback information comprising an indicator for indicating a switch to the second mode,

wherein the feedback information is received through the fast feedback channel according to the first mode, and

wherein the feedback information is received before the receiving of the signal for requesting the mode switching.

13. A Mobile Station (MS) apparatus in a wireless communication system using a fast feedback channel supporting at least two modes of the fast feedback channel, the apparatus comprising:

a first configuration unit configured to generate a feedback signal to be transmitted through the fast feedback channel according to a first mode of the fast feedback channel;

a second configuration unit configured to generate a feedback signal to be transmitted through the fast feedback channel according to a second mode of the fast feedback channel;

a transmitter configured to transmit the feedback signal;

a determination unit configured to control feedback signal generation operations of the first and second configuration units according to a feedback mode of the fast feedback channel, and, if it is determined that the fast feedback channel changes the feedback mode from the first mode to the second mode, to provide control such that a signal for mode switching is transmitted through the fast feedback channel; and

a receiver configured to receive feedback channel allocation information for permitting switching to the second mode from a Base Station (BS), the feedback channel allocation information comprising a feedback period and the second feedback mode to be switched,

wherein the determination unit is further configured to determine to switch to the second mode indicated by the feedback channel allocation information.

14. The apparatus of claim 13 ,

wherein the first mode comprises a mode where the MS transmits a code sequence through the fast feedback channel, and

wherein the second mode comprises a mode where the MS transmits at least one pilot symbol and at least one feedback information symbol through the fast feedback channel.

15. The apparatus of claim 14 , wherein a signal for requesting the mode switching is a code sequence which is assigned for a request of the mode switching and the code sequence is transmitted according to the first mode.

16. The apparatus of claim 13 ,

wherein the first mode comprises a mode where the MS transmits at least one pilot symbol and at least one feedback information symbol through the fast feedback channel, and

wherein the second mode comprises a mode where the MS transmits a code sequence through the fast feedback channel.

17. The apparatus of claim 16 , wherein a signal for requesting the mode switching is a code sequence which is assigned for a request of the mode switching and the code sequence is transmitted according to the first mode.

18. The apparatus of claim 16 , wherein the transmitter transmits feedback information comprising an indicator for indicating a switch to the second mode,

wherein the feedback information is transmitted through the fast feedback channel according to the first mode, and

wherein the feedback information is transmitted before the transmitting of the signal for requesting the mode switching.

19. A Base Station (BS) apparatus in a wireless communication system using a fast feedback channel supporting at least two modes of the fast feedback channel, the apparatus comprising:

a first detector configured to detect feedback information from a feedback signal received through the fast feedback channel according to a first mode of the fast feedback channel;

a second detector configured to detect feedback information from a feedback signal received through the fast feedback channel according to a second mode of the fast feedback channel; and

a manager configured to control operations of the first and second detectors according to a feedback mode of the feedback channel, for stopping the detection operation of the first detector when a signal for requesting mode switching is detected through the fast feedback channel, to control to transmit feedback channel allocation information for permitting the mode switching, and to control one of the first detector and the second detector according to the second mode indicated by the feedback channel allocation information among the first detector and the second detector to detect feedback information,

wherein the feedback channel allocation information comprises a feedback period and the second mode to be switched.

20. The apparatus of claim 19 ,

wherein the first mode comprises a mode where the MS transmits a code sequence through the fast feedback channel, and

wherein the second mode comprises a mode where the MS transmits at least one pilot symbol and at least one feedback information symbol through the fast feedback channel.

21. The apparatus of claim 20 , wherein a signal for requesting the mode switching is a code sequence which is assigned for a request of the mode switching and the code sequence is detected according to the first mode.

22. The apparatus of claim 19 ,

wherein the first mode comprises a mode where the MS transmits at least one pilot symbol and at least one feedback information symbol through the fast feedback channel, and

wherein the second mode comprises a mode where the MS transmits a code sequence through the fast feedback channel.

23. The apparatus of claim 22 , wherein a signal for requesting the mode switching is a code sequence which is assigned for a request of the mode switching and the code sequence is detected according to the second mode.

24. The apparatus of claim 22 , wherein the first detector detects feedback information comprising an indicator for indicating a switch to the second mode,

wherein the feedback information is detected according to the first mode, and

wherein the feedback information is detected before the second detector detects the signal for requesting the mode switching.