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

• US 10,256,962 B2
• Filed: 07/06/2015
• Issued: 04/09/2019
• 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): Jagannathan, Melanie
• Application Number:
  US14/792,146
• Publication Number:
  US 20150312929A1
• Time in Patent Office: 1,373 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 channel quality indicator (CQI) information in a wireless communication system, the method comprising:

obtaining, at a mobile station, a wideband CQI;

obtaining, at the mobile station, a sub-band CQI for a sub-band selected by the mobile station;

encoding the wideband CQI and the sub-band CQI;

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

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

transmitting, at the mobile station, the wideband CQI, the sub-band CQI for the sub-band, and an index for the sub-band on the allocated physical channel,

wherein the wideband CQI and the sub-band CQI are transmitted using a same transmission time interval in an aperiodic CQI report.

2. The method of claim 1, wherein a number of sub-bands selected by the mobile station is less than a total number of sub-bands of a wideband corresponding to the wideband CQI.

3. 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.

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

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

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

decoding and obtaining the wideband CQI and the sub-band CQI for a sub-band,

wherein the sub-band CQI is received with an index for the sub-band band selected by a mobile station, and

wherein the wideband CQI and the sub-band CQI are received using a same transmission time interval in an aperiodic CQI report.

5. The method of claim 4, wherein a number of sub-bands selected by the mobile station is less than a total number of sub-bands of a wideband corresponding to the wideband CQI.

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

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

at least one processor configured to;

obtain a wideband CQI,

obtain a sub-band CQI for a sub-band selected by the mobile station,

encode the wideband CQI and the sub-band CQI,

modulate the wideband CQI and the sub-band CQI based on a modulation scheme, and

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

a transmitter configured to transmit the wideband CQI, the sub-band CQI for the sub-band, and an index for the sub-band on the allocated physical channel,

wherein the wideband CQI and the sub-band CQI are transmitted using a same transmission time interval in an aperiodic CQI report.

8. The apparatus of claim 7, wherein a number of sub-bands selected by the mobile station is less than a total number of sub-bands of a wideband corresponding to the wideband CQI.

9. The apparatus of claim 7, wherein the wideband CQI and the sub-band CQI are calculated based on a predetermined reference signal from a base station.

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

a receiver; and

at least one processor configured to;

receive and demap a wideband CQI and a sub-band CQI on an allocated physical channel,

demodulate the wideband CQI and the sub-band CQI based on a defined modulation scheme, and

decode and obtain the wideband CQI and the sub-band CQI for a sub-band,

wherein the sub-band CQI is received with an index for the sub-band band selected by a mobile station, and

wherein the wideband CQI and the sub-band CQI are received using a same transmission time interval in an aperiodic CQI report.

11. The apparatus of claim 10, wherein a number of sub-bands selected by the mobile station is less than a total number of sub-bands of a wideband corresponding to the wideband CQI.

12. The apparatus of claim 10, wherein the wideband CQI and the sub-band CQI are calculated based on a predetermined reference signal from the base station.