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

• US 9,831,998 B2
• Filed: 09/25/2013
• Issued: 11/28/2017
• 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): Dsouza, Adolf
• Application Number:
  US14/036,105
• Publication Number:
  US 20140086172A1
• Time in Patent Office: 1,525 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 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:

receiving, at the mobile station, a signal from a base station;

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

calculating, at the mobile station, at least one sub-band CQI for at least one sub-band from among the plurality of sub-bands based on the signal; and

transmitting the calculated wideband CQI for the entire band and the calculated at least one sub-band CQI for the at least one sub-band at a same transmission time interval,

wherein when the at least one sub-band for a sub-band CQI transmission is configured by a high layer, the at least one sub-band CQI for the at least one sub-band is transmitted without at least one index indicating a position of the at least one sub-band.

2. The method of claim 1, further comprising:

before the transmitting, 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;

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

configuring an uplink physical channel 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 the uplink physical channel.

3. The method of claim 1, wherein a number of the plurality of sub-bands in the entire band is configured by the high layer.

4. The method of claim 1, 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.

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, based on the order of having better CQI.

6. 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 transceiver configured to communicate with a base station; and

at least one processor coupled with the transceiver and configured to;

receive a signal from a base station,

calculate a wideband CQI for an entire band based on the signal, the entire band including a plurality of sub-bands,

calculate at least one sub-band CQI for at least one sub-band from among the plurality of sub-bands based on the signal, and

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

wherein when the at least one sub-band for a sub-band CQI transmission is configured by a high layer, the at least one sub-band CQI for the at least one sub-band is transmitted without at least one index indicating a position of the at least one sub-band.

7. The apparatus of claim 6, wherein the at least one processor is further configured to:

perform 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;

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

configure an uplink physical channel 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 the uplink physical channel.

8. The apparatus of claim 6, wherein a number of the plurality of sub-bands in the entire band is configured by the high layer.

9. The apparatus of claim 6, 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.

10. The apparatus of claim 6, wherein the at least one sub-band for the sub-band CQI transmission is selected, by the mobile station, based on the order of having better CQI.

11. 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:

transmitting, at the base station, a signal to the mobile station; and

receiving, at the base station, a wideband CQI for an entire band and at least one sub-band CQI for the at least one sub-band from among a plurality of sub-bands at a same transmission time interval, the entire band including the plurality of sub-bands,

wherein the wideband CQI and the at least one sub-band CQI is calculated based on the signal by the mobile station, and

wherein when the at least one sub-band for a sub-band CQI transmission is configured by a high layer, the at least one sub-band CQI for the at least one sub-band is transmitted without at least one index indicating a position of the at least one sub-band.

12. The method of claim 11, wherein a number of the plurality of sub-bands in the entire band is configured by the base station.

13. The method of claim 11, 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.

14. The method of claim 11, wherein the at least one sub-band for the sub-band CQI transmission is selected, by the mobile station, based on the order of having better CQI.

15. 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 transceiver configured to communicate with a mobile station; and

at least one processor coupled with the transceiver and configured to;

transmit a signal to the mobile station, and

receive a wideband CQI for an entire band and at least one sub-band CQI for the at least one sub-band from among a plurality of sub-bands at a same transmission time interval, the entire band including the plurality of sub-bands,

wherein the wideband CQI and the at least one sub-band CQI is calculated based on the signal by the mobile station, and

wherein when the at least one sub-band for a sub-band CQI transmission is configured by a high layer, the at least one sub-band CQI for the at least one sub-band is transmitted without at least one index indicating a position of the at least one sub-band.

16. The apparatus of claim 15, wherein a number of the plurality of sub-bands in the entire band is configured by the high layer.

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 15, wherein the at least one sub-band for the sub-band CQI transmission is selected, by the mobile station, based on the order of having better CQI.