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

• US 9,467,268 B2
• Filed: 09/25/2013
• Issued: 10/11/2016
• 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): Nguyen, Brian D
• Assistant Examiner(s): FARAHMAND, ASHIL S
• Application Number:
  US14/036,089
• Publication Number:
  US 20140086171A1
• Time in Patent Office: 1,112 Days
• Field of Search: None
• US Class Current: 1/1
• 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 at least two sub-bands;

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

transmitting, at the mobile station, the at least one sub-band CQI for the at least one sub-band at a transmission time interval for a sub-band CQI transmission; and

transmitting, at the mobile station, the wideband CQI at a transmission time interval for a wideband CQI,

wherein the transmission time interval for a wideband CQI is set based on N times of number of the transmission time interval for a sub-band CQI transmission, and

wherein N is an integer greater than 1.

2. The method of claim 1, wherein the N is configured by a base station.

3. The method of claim 1, wherein a number of sub-bands are configured by a base station.

4. The method of claim 1, wherein the at least one sub-band for the sub-band CQI transmission is configured by a base station.

5. The method of claim 1, wherein the at least one sub-band for the sub-band CQI transmission is selected by the mobile station.

6. The method of claim 4, wherein when the at least one sub-band for the sub-band CQI transmission is configured by the base station, the at least one sub-band CQI for the at least one sub-hand does not include at least one index indicating a position of the at least one sub-band but at least one CQI value.

7. The method of claim 5, wherein when the at least one sub-band for the sub-band CQI transmission is selected by the mobile station, the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band.

8. The method of claim 1, further comprising:

performing a channel encoding process for the wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band before transmitting the at least one sub-band CQI for the at least one sub-band and transmitting the wideband CQI;

modulating the encoded wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band based on a set modulation scheme; and

performing physical channel configuration to insert the modulated wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band into a physical channel allocated in a reverse direction in the wireless communication system based on OFDMA.

9. The method of claim 1,

wherein the wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band are transmitted during the same transmission time interval.

10. The method of claim 9, wherein the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band.

11. 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 method comprising:

a controller configured to;

calculate a wideband CQI for an entire band, the entire band including at least two sub-bands, and

calculate at least one sub-band CQI for the at least one sub-band; and

a transmitter configured to;

transmit at the at least one sub-band CQI for the at least one sub-band at a transmission time interval for a sub-band CQI transmission and the wideband CQI at a transmission time interval for a wideband CQI transmission,

wherein the transmission time interval for a wideband CQI is set based on N times of a number of the transmission time interval for a sub-band CQI transmission, and

wherein N is an integer greater than 1.

12. The apparatus of claim 11, wherein the N is configured by a base station.

13. The apparatus of claim 11, wherein a number of sub-bands are configured by a base station.

14. The apparatus of claim 11, wherein the at least one sub-band for the sub-band CQI transmission is configured by a base station.

15. The apparatus of claim 11, wherein the at least one sub-band for the sub-band CQI transmission is selected by the mobile station.

16. The apparatus of claim 14, wherein when the at least one sub-band for the sub-band CQI transmission is configured by the base station, the at least one sub-band CQI for the at least one sub-band does not include at least one index indicating a position of the at least one sub-band but at least one CQI value.

17. The apparatus of claim 15, wherein when the at least one sub-band for the sub-band CQI transmission is selected by the mobile station, the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band.

18. The apparatus of claim 11, further comprising:

a channel encoder configured to perform channel encoding for the wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band before transmitting at least one sub-band CQI for the at least one sub-band and transmitting the wideband CQI;

a modulator configured to modulate the encoded wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band based on a set modulation scheme; and

a physical channel configurator configured to insert the modulated wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band into a physical channel allocated in a reverse direction in the wireless communication system based on OFDMA.

19. The apparatus of claim 11,

wherein the transmitter transmits the wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band during the same transmission time interval.

20. The apparatus of claim 19, wherein the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band.

21. A method for receiving, at a 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, at least one sub-band CQI for at least one sub-band at a transmission time interval for a sub-band CQI transmission;

receiving, at the base station, a wideband CQI for an entire band at a transmission time interval for a wideband CQI transmission,

the entire band including at least two sub-bands,

wherein the transmission time interval for a wideband CQI is set based on N times of a number of the transmission time interval for a sub-band CQI transmission, and

wherein N is an integer greater than 1.

22. method of claim 21, wherein the N is configured by the base station.

23. The method of claim 21, wherein a number of sub-bands are configured by the base station.

24. The method of claim 21, wherein the at least one sub-band for the sub-band CQI transmission is configured by the base station.

25. The method of claim 21, wherein the at least one sub-band for the sub-band CQI transmission is selected by the mobile station.

26. The method of claim 24, wherein when the at least one sub-band for the sub-band CQI transmission is configured by the base station, the at least one sub-band CQI for the at least one sub-band does not include at least one index indicating a position of the at least one sub-band but at least one CQI value.

27. The method of claim 25, wherein when the at least one sub-band for the sub-band CQI transmission is selected by the mobile station, the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band.

28. The method of claim 21,

wherein the wideband CQI is for an entire band, and

wherein the wideband CQI for the entire band and the at least one sub-band CQI for the at least one sub-band are received during the same transmission time interval.

29. The method of claim 28, wherein the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band.

30. An apparatus for receiving, at a 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 apparatus comprising:

a receiver configured to;

receive, at the base station, at least one sub-band CQI for at least one sub-band at a transmission time interval for a sub-band CQI transmission and a wideband CQI for an entire band at a transmission time interval for a wideband CQI transmission, the entire band including at least two sub-bands; and

a controller,

wherein the transmission time interval for the wideband CQI is set based on N times of a number of the transmission time interval for the at least one sub-band CQI transmission, and

wherein N is an integer greater than 1.

31. the apparatus of claim 30, wherein the N is configured by the base station.

32. The apparatus of claim 30, wherein a number of sub-bands are configured by the base station.

33. The apparatus of claim 30, wherein the at least one sub-band for the sub-band CQI transmission is configured by the base station.

34. The apparatus of claim 30, wherein the at least one sub-band for the sub-band CQI transmission is selected by the mobile station.

35. The apparatus of claim 33, wherein when the at least one sub-band for the sub-band CQI transmission is configured by the base station, the at least one sub-band CQI for the at least one sub-band does not include at least one index indicating a position of the at least one sub-band but at least one CQI value.

36. The apparatus of claim 34, wherein when the at least one sub-band for the sub-band CQI transmission is selected by the mobile station, the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band.

37. The apparatus of claim 30, wherein the transmission time interval for the wideband CQI for the entire band and the transmission time interval for the at least one sub-band CQI for the at least one sub-band is the same transmission time interval.

38. The apparatus of claim 37, wherein the at least one sub-band CQI for the at least one sub-band comprises at least one CQI value and at least one index indicating a position of the at least one sub-band.