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

• US 10,129,002 B2
• Filed: 09/28/2015
• Issued: 11/13/2018
• 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): Jung, Min
• Application Number:
  US14/867,582
• Publication Number:
  US 20160020888A1
• Time in Patent Office: 1,142 Days
• 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 transmitting a channel quality indicator (CQI) in a wireless communication system, the method comprising:

obtaining, at a mobile station, a first CQI for an entire frequency band, the entire frequency band including a plurality of sub-bands;

obtaining, at the mobile station, a second CQI for each of the plurality of sub-bands; and

transmitting, by the mobile station, the first CQI and at least one second CQI in a same transmission time interval,

wherein the plurality of sub-bands are configured between a base station and the mobile station, and

wherein the first CQI is a CQI for the entire frequency band.

2. The method of claim 1, further comprising:

before the transmitting of the first CQI and the at least one second CQI, encoding the first CQI and the at least one second CQI;

modulating the encoded first CQI and the at least one second CQI based on a modulation scheme; and

mapping the modulated first CQI and the at least one second CQI on an allocated physical channel.

3. The method of claim 1, wherein the first CQI and the at least one second CQI are obtained based on a predetermined reference signal from the base station.

4. The method of claim 1, wherein the first CQI and the at least one second CQI are transmitted in an aperiodic report.

5. The method of claim 1, wherein the first CQI and the at least one second CQI are transmitted in a periodic report.

6. A method for receiving a channel quality indicator (CQI) in a wireless communication system, the method comprising:

receiving, at a base station, a first CQI for an entire frequency band, the entire frequency band including a plurality of sub-bands; and

receiving, at the base station, a second CQI for each of the plurality of sub-bands,

wherein the first CQI and at least one of the second CQI are received at the base station in a same transmission time interval from a mobile station,

wherein the plurality of sub-bands are configured between the base station and the mobile station, and

wherein the first CQI is a CQI for the entire frequency band.

7. The method of claim 6,

wherein, by the mobile station, the first CQI and the at least one second CQI are encoded, the encoded first CQI and the at least one second CQI are modulated based on a modulation scheme, and the modulated first CQI and the at least one second CQI are mapped on an allocated physical channel.

8. The method of claim 6, wherein the first CQI and the at least one second CQI are obtained, by the mobile station, based on a predetermined reference signal from the base station.

9. The method of claim 6, wherein the first CQI and the at least one second CQI are received in an aperiodic report.

10. The method of claim 6, wherein the first CQI and the at least one second CQI are received in a periodic report.

11. An apparatus for transmitting a channel quality indicator (CQI) in a wireless communication system, the apparatus comprising:

at least one processor configured to;

obtain a first CQI for an entire frequency band, the entire frequency band including a plurality of sub-bands, and

obtain a second CQI for each of the plurality of sub-bands; and

a transmitter configured to transmit the first CQI and at least one of the second CQI in a same transmission time interval,

wherein the plurality of sub-bands are configured between a base station and the apparatus, and

wherein the first CQI is a CQI for the entire frequency band.

12. The apparatus of claim 11, further comprising:

an encoder configured to encode the first CQI and the at least one second CQI before the transmitting of the first CQI and the at least one second CQI;

a modulator configured to modulate the encoded first CQI and the at least one second CQI based on a modulation scheme; and

a mapper configured to map the modulated first CQI and the at least one second CQI on an allocated physical channel.

13. The apparatus of claim 11, wherein the first CQI and the at least one second CQI are obtained based on a predetermined reference signal from the base station.

14. The apparatus of claim 11, wherein the first CQI and the at least one second CQI are transmitted in an aperiodic report.

15. The apparatus of claim 11, wherein the first CQI and the at least one second CQI are transmitted in a periodic report.

16. An apparatus for receiving a channel quality indicator (CQI) in a wireless communication system, the apparatus comprising:

a receiver; and

at least one processor configured to;

control the receiver to receive a first CQI for an entire frequency band, the entire frequency band including a plurality of sub-bands, and

control the receiver to receive a second CQI for each of the plurality of sub-bands,

wherein the first CQI and at least one of the second CQI are received in a same transmission time interval from a mobile station,

wherein the plurality of sub-bands are configured between the apparatus and the mobile station, and

wherein the first CQI is a CQI for the entire frequency band.

17. The apparatus of claim 16,

wherein, by the mobile station, the first CQI and the at least one second CQI are encoded,

wherein the encoded first CQI and the at least one second CQI are modulated based on a modulation scheme, and

wherein the modulated first CQI and the at least one second CQI are mapped on an allocated physical channel.

18. The apparatus of claim 16, wherein the first CQI and the at least one second CQI are obtained, by the mobile station, based on a predetermined reference signal from the apparatus.

19. The apparatus of claim 16, wherein the first CQI and the at least one second CQI are received in an aperiodic report.

20. The apparatus of claim 16, wherein the first CQI and the at least one second CQI are received in a periodic report.