Apparatus and method for feeding back channel quality information and scheduling apparatus and method using the same in a wireless communication system

• US 8,094,733 B2
• Filed: 08/29/2006
• Issued: 01/10/2012
• Est. Priority Date: 08/29/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kwon, Hwan-Joon, Jeong, Kyeong-In, Han, Jin-Kyu, Kim, Dong-Hee
• Primary Examiner(s): Payne, David C.
• Assistant Examiner(s): Stevens, Brian J
• Application Number:
  US11/511,504
• Publication Number:
  US 20070098093A1
• Time in Patent Office: 1,960 Days
• Field of Search: 375/260, 375/259
• US Class Current: 375/260
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/26 using historical data, averaging values or statistics
• CPC Class Codes: H04B 17/30 of propagation channels
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 17/327 Received signal code power [RSCP]
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/225 Calculation of statistics, e.g. average, variance
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

An apparatus and method are provided for feeding back channel quality information and performing scheduling using the fed-back channel quality information in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA). In the OFDMA wireless communication system, forward performance degradation due to a decrease in an amount of reverse channel quality information is reduced, and also an increase in the reverse load due to channel quality information feedback is suppressed. A base station controls power of a physical channel using information fed back from a mobile station. In a method for feeding back channel quality information from the mobile station, sub-band-by-sub-band channel quality information is measured and channel-by-channel quality information of a number of channels is transmitted in order of sub-bands of better channel quality information. Average channel quality information for a total band is measured and transmitted.

Claims

1. A method for feeding back channel quality information (CQI), at a mobile station, in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA), the method comprising:

calculating, at the mobile station, a wideband CQI for an entire band, the entire band including a plurality of sub-bands;

calculating, at the mobile station, a sub-band CQI for at least one sub-band;

transmitting, at the mobile station, the sub-band CQI and the wideband CQI at different time intervals for periodic CQI transmission; and

transmitting the sub-band CQI and the wideband CQI at a same time interval for aperiodic CQI transmission.

2. The method of claim 1, wherein in case of periodic CQI transmission, a plurality of sub-band CQIs are transmitted between two consecutive wideband CQI transmissions.

3. The method of claim 1, wherein in case of periodic CQI transmission, at least one of a transmission period of the sub-band CQI and a transmission period of the wideband CQI are predetermined.

4. The method of claim 1, wherein in case of aperiodic CQI transmission, the at least one sub-band is a preferred sub-band selected by the mobile station among the plurality of sub-bands.

5. The method of claim 4, further comprising:

transmitting an index indicating a position of the at least one selected sub-band in case of the aperiodic CQI transmission.

6. The method claim 1, wherein the sub-band CQI is calculated per a sub-band for determined number of sub-bands.

7. The method of claim 6, wherein the determined number of sub-bands are M sub-bands in the order of having good channel quality.

8. An apparatus for feeding back channel quality information (CQI), at a mobile station, in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA), the apparatus comprising:

a controller for calculating a wideband CQI for an entire band, the entire band including a plurality of sub-bands, and a sub-band CQI for at least one sub-band; and

a transmitter for transmitting the sub-band CQI and the wideband CQI at different time intervals for periodic CQI transmission and for transmitting the sub-band CQI and the wideband CQI at a same time interval for aperiodic COI transmission.

9. The apparatus of claim 8, wherein in case of periodic CQI transmission, a plurality of sub-band CQIs are transmitted between two consecutive wideband CQI transmissions.

10. The apparatus of claim 8, wherein in case of periodic CQI transmission, a transmission period of the sub-band CQI and a transmission period of the wideband CQI are predetermined.

11. The apparatus of claim 8, wherein in case of aperiodic CQI transmission, the at least one sub-band is a preferred sub-band selected by the mobile station among the plurality of sub-bands.

12. The apparatus of claim 11, wherein the transmitter transmits an index indicating a position of the at least one selected sub-band in case of the aperiodic CQI transmission.

13. The apparatus claim 8, wherein the sub-band CQI is calculated per a sub-band for determined number of sub-bands.

14. The apparatus of claim 13, wherein the determined number of sub-bands are M sub-bands in the order of having good channel quality.

15. A method for receiving, at base station, channel quality information (CQI) transmitted from a mobile station in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA), the method comprising:

receiving, at the base station, a wideband CQI;

receiving, at the base station, a sub-band CQI and the wideband CQI at different time intervals for periodic CQI reception; and

receiving the sub-band CQI and the wideband CQI at a same time interval for aperiodic CQI reception,

wherein the wideband CQI is for an entire band, the entire band including a plurality of sub-bands and the sub-band CQI is for at least one sub-band.

16. The method of claim 15, wherein in case of periodic CQI reception, a plurality of sub-band CQI are received between two consecutive wideband CQI receptions.

17. The method of claim 15, wherein in case of periodic CQI reception, a reception period of the sub-band CQI and a reception period of the wideband CQI are predetermined.

18. The method of claim 15, wherein in case of aperiodic CQI reception, the at least one sub-band is a preferred sub-band selected by the mobile station among the plurality of sub-bands.

19. The method of claim 18, further comprising:

receiving an index, from the mobile station, indicating a position of the at least one selected sub-band in case of the aperiodic CQI reception.

20. The method claim of 15, wherein the sub-band CQI is calculated per a sub-band for determined number of sub-bands.

21. The method of claim 20, wherein the determined number of sub-bands are M sub-bands in the order of having good channel quality.

22. An apparatus for receiving, at base station, channel quality information(CQI) from a mobile station in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA), the apparatus comprising:

a channel quality controller for receiving a wideband CQI, and for receiving a sub-band CQI and the wideband CQI at different time intervals for periodic CQI reception and for receiving the sub-band CQI and the wideband CQI at a same time interval for aperiodic CQI reception,

wherein the wideband CQI is for an entire band, the entire band including a plurality of sub-bands, and the sub-band CQI is for at least one sub-band.

23. The apparatus of claim 22, wherein in case of periodic CQI reception, the channel quality controller receives a plurality of sub-band CQIs between two consecutive wideband CQI receptions.

24. The apparatus of claim 22, wherein in case of periodic CQI reception, a reception period of the sub-band CQI and a reception period of the wideband CQI are predetermined.

25. The apparatus of claim 22, wherein in case of aperiodic CQI reception, the at least one sub-band is a preferred sub-band selected by the mobile station among the plurality of sub-bands.

26. The apparatus of claim 25, wherein the channel quality controller receives an index, from the mobile station, indicating a position of the at least one selected sub-band in case of the aperiodic CQI reception.

27. The apparatus claim 22, wherein the sub-band CQI is calculated per a sub-band for determined number of sub-bands.

28. The apparatus of claim 27, wherein the determined number of sub-bands are M sub-bands in the order of having good channel quality.