APPARATUS AND METHOD FOR FEEDING BACK CHANNEL QUALITY INFORMATION AND SCHEDULING APPARATUS AND METHOD USING THE SAME IN A WIRELESS COMMUNICATION SYSTEM

• US 20150312928A1
• Filed: 07/06/2015
• Published: 10/29/2015
• 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
• Granted Patent: US 9,819,468 B2
• Time in Patent Office: Days
• 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 transmitting channel quality indicator (CQI) in a wireless communication system, the method comprising:

calculating, at the mobile station, one of a first sub-band CQI for a sub-band selected by the mobile station or a second sub-band CQI for a configured sub-band; and

transmitting, at the mobile station, one of the first sub-band CQI and the second sub-band CQI,

wherein if the first sub-band CQI is transmitted, information denoting the sub-band selected by the mobile station is transmitted with the first sub-band CQI,

if the second sub-band CQI is transmitted, information denoting the sub-band selected by the mobile station is not transmitted with the second sub-band CQI.

2. The method of claim 1, further comprising steps of:

before the step of transmitting,

encoding the wideband CQI and the sub-band CQI;

modulating the encoded wideband CQI and sub-band CQI based on a modulation scheme; and

mapping the modulated wideband CQI and sub-band CQI on an allocated physical channel.

3. The method of claim 1, wherein a number of sub-band selected by the mobile station is less than a total number of sub-band.

4. The method of claim 1, wherein the wideband CQI and the sub-band CQI are calculated based on a predetermined reference signal from a base station.

5. The method of claim 1, wherein the configured sub-band is set between a base station and the mobile station.

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

receiving, at a base station, one of first sub-band CQI for a sub-band selected by the mobile station and second sub-band CQI for a configured sub-band, the one of the first sub-band CQI or the second sub-band CQI is calculated at the mobile station,

wherein if the first sub-band CQI is received, information denoting the sub-band selected by the mobile station is received with the first sub-band CQI,

if the second sub-band CQI is received, information denoting the sub-band selected by the mobile station is not received with the second sub-band CQI.

7. The method of claim 6, further comprising steps of:

demapping the wideband CQI and sub-band CQI on an allocated physical channel;

demodulating the wideband CQI and sub-band CQI based on a modulation scheme; and

decoding the wideband CQI and the sub-band CQI.

8. The method of claim 6, wherein a number of sub-band selected by the mobile station is less than a total number of sub-band.

9. The method of claim 6, wherein the wideband CQI and the sub-band CQI are calculated based on a predetermined reference signal from a base station.

10. The method of claim 6, wherein the configured sub-band is set between a base station and the mobile station.

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

a controller for calculating one of a first sub-band CQI for a sub-band selected by the mobile station or a second sub-band CQI for a configured sub-band; and

a transmitter for transmitting one of the first sub-band CQI and the second sub-band CQI,

wherein if the first sub-band CQI is transmitted, information denoting the sub-band selected by the mobile station is transmitted with the first sub-band CQI,

if the second sub-band CQI is transmitted, information denoting the sub-band selected by the mobile station is not transmitted with the second sub-band CQI.

12. The apparatus of claim 11, further comprising:

an encoder for encoding the wideband CQI and the sub-band CQI;

a modulator for modulating the encoded wideband CQI and sub-band CQI based on a modulation scheme; and

a mapper for mapping the modulated wideband CQI and sub-band CQI on an allocated physical channel.

13. The apparatus of claim 11, wherein a number of sub-band selected by the mobile station is less than a total number of sub-band.

14. The apparatus of claim 11, wherein the wideband CQI and the sub-band CQI are calculated based on a predetermined reference signal from a base station.

15. The apparatus of claim 11, wherein the configured sub-band is set between a base station and the mobile station.

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

a receiver for receiving one of first sub-band CQI for a sub-band selected by the mobile station and second sub-band CQI for a configured sub-band, the one of the first sub-band CQI or the second sub-band CQI is calculated at the mobile station,

wherein if the first sub-band CQI is received, information denoting the sub-band selected by the mobile station is received with the first sub-band CQI,

if the second sub-band CQI is received, information denoting the sub-band selected by the mobile station is not received with the second sub-band CQI.

17. The apparatus of claim 16, further comprising:

a demapper for demapping the wideband CQI and sub-band CQI on an allocated physical channel;

a demodulator for demodulating the wideband CQI and sub-band CQI based on a modulation scheme; and

a decoder for decoding the wideband CQI and the sub-band CQI.

18. The apparatus of claim 16, wherein a number of sub-band selected by the mobile station is less than a total number of sub-band.

19. The apparatus of claim 16, wherein the wideband CQI and the sub-band CQI are calculated based on a predetermined reference signal from a base station.

20. The apparatus of claim 16, wherein the configured sub-band is set between a base station and the mobile station.