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). 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.
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Technologies
Resource configuration Channel Status Information(CSI) Reporting
Product
User Equipment (UE/Terminal)Base Station (eNB/gNB)
Use Cases
Wireless communication
Services
Channel Quality Measurement/Estimation
Claim
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 first sub-band selected by a mobile station from an entire band including a plurality of sub-bands, and a second sub-band CQI for a second sub-band configured by a high layer from among the plurality of sub-bands of the entire 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 first sub-band selected by the mobile station is transmitted with the first sub-band CQI, and
wherein, if the second sub-band CQI is transmitted, information denoting the second sub-band 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 a wideband CQI and the first or second sub-band CQI;
modulating the encoded wideband CQI and the encoded first or second sub-band CQI based on a modulation scheme; and
mapping the modulated wideband CQI and the modulated first or second sub-band CQI on an allocated physical channel.
3. The method of claim 1, wherein a number of the first 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 first or second sub-band CQI are calculated based on a predetermined reference signal from a base station.
5. The method of claim 1, wherein the configured second 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 first sub-band selected by a mobile station from an entire band including a plurality of sub-bands and a second sub-band CQI for a second sub-band configured by a high layer from among the plurality of sub-bands of the entire band, the one of the first sub-band CQI or the second sub-band CQI being calculated at the mobile station,
wherein, if the first sub-band CQI is received, information denoting the first sub-band selected by the mobile station is received with the first sub-band CQI, and
wherein, if the second sub-band CQI is received, information denoting the second sub-band is not received with the second sub-band CQI.
7. The method of claim 6, further comprising steps of:
demapping a wideband CQI and the first or second sub-band CQI on an allocated physical channel;
demodulating the demapped wideband CQI and the demapped first or second sub-band CQI based on a modulation scheme; and
decoding the demodulated wideband CQI and the demodulated first or second sub-band CQI.
8. The method of claim 6, wherein a number of the first 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 first or second sub-band CQI are calculated based on a predetermined reference signal from a base station.
10. The method of claim 6, wherein the configured second 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 transmitter configured to transmit data, and
at least one processor coupled with the transmitter and configured to:
calculate one of a first sub-band CQI for a first sub-band selected by the mobile station from an entire band including a plurality of sub-bands and a second sub-band CQI for a second sub-band configured by a high layer from among the plurality of sub-bands of the entire band, and
control the transmitter to transmit 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 first sub-band selected by the mobile station is transmitted with the first sub-band CQI, and
wherein, if the second sub-band CQI is transmitted, information denoting the second sub-band is not transmitted with the second sub-band CQI.
12. The apparatus of claim 11, further comprising:
an encoder for encoding a wideband CQI and the first or second sub-band CQI;
a modulator for modulating the encoded wideband CQI and the encoded first or second sub-band CQI based on a modulation scheme; and
a mapper for mapping the modulated wideband CQI and the modulated first or second sub-band CQI on an allocated physical channel.
13. The apparatus of claim 11, wherein a number of the first 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 first or second sub-band CQI are calculated based on a predetermined reference signal from a base station.
15. The apparatus of claim 11, wherein the configured second 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 configured to receive data; and
at least one processor coupled with the receiver and configured to:
control the receiver to receive one of first sub-band CQI for a first sub-band selected by a mobile station from an entire band including a plurality of sub-bands and a second sub-band CQI for a second sub-band configured by a high layer from among the plurality of sub-bands of the entire band, the one of the first sub-band CQI or the second sub-band CQI being calculated at the mobile station,
wherein, if the first sub-band CQI is received, information denoting the first sub-band selected by the mobile station is received with the first sub-band CQI, and
wherein, if the second sub-band CQI is received, information denoting the second sub-band is not received with the second sub-band CQI.
17. The apparatus of claim 16, further comprising:
a demapper for demapping a wideband CQI and the first or second sub-band CQI on an allocated physical channel;
a demodulator for demodulating the demapped wideband CQI and the demapped first or second sub-band CQI based on a modulation scheme; and
a decoder for decoding the demodulated wideband CQI and the demodulated first or second sub-band CQI.
18. The apparatus of claim 16, wherein a number of the first 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 first or second sub-band CQI are calculated based on a predetermined reference signal from a base station.
20. The apparatus of claim 16, wherein the configured second sub-band is set between a base station and the mobile station.
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