Method and apparatus for transmitting uplink control information in a wireless communication system
The present invention provides a method and apparatus for transmitting uplink control information (UCI) by user equipment in a wireless communication. The user equipment performs channel coding on information bits of the UCI to generate encoding information bits; performs modulation on the thus generated encoding information bits to generate complex modulation symbols; spreads the complex modulation symbols block-wise to a plurality of single carrier-frequency division multiple access (SC-FDMA) symbols based on an orthogonal sequence; and transmits the spread complex modulation symbols to a base station.
1. A method for transmitting, by a user equipment (UE), uplink control information (UCI) on a physical uplink control channel (PUCCH) in a wireless communication system, the method comprising:
receiving a scheduling request (SR) configuration for transmission of an SR bit through a radio resource control (RRC) layer from a base station;
performing channel coding on information bits of the UCI to generate encoded information bits, wherein the information bits of the UCI include hybrid automatic repeat request acknowledgement (HARQ-ACK) information bits for a plurality of serving cells and the SR bit, if transmission of the HARQ-ACK information bits coincides with a subframe, configured by the SR configuration, for transmission of the SR bit;
generating complex-valued modulation symbols by modulating the encoded information bits;
block-wise spreading the complex-valued modulation symbols with an orthogonal code; and
transmitting the spread complex-valued modulation symbols to the base station.
2. The method of claim 1 , wherein the SR bit is appended at the end of the HARQ-ACK information bits.
3. The method of claim 1 , wherein the HARQ-ACK information bits for a plurality of serving cells include concatenation of HARQ-ACK information bits for each of the plurality of serving cells.
4. The method of claim 1 , wherein a number of the HARQ-ACK information bits for each of the plurality of serving cells is 1 bit.
5. The method of claim 1 , wherein a number of the HARQ-ACK information bits for each of the plurality of serving cells is 2 bits.
6. The method of claim 5 , wherein one of the HARQ-ACK information bits for each of the plurality of serving cells corresponds to an HARQ-ACK information bit for a first codeword, and
wherein a remaining bit of the HARQ-ACK information bits for each of the plurality of serving cells corresponds to an HARQ-ACK information bit for a second codeword.
7. The method of claim 1 , wherein the SR bit is 1 bit.
8. The method of claim 7 , wherein if a value of the SR bit is 1, it indicates a presence of an SR transmission event, and
wherein if a value of the SR bit is 0, it indicates an absence of the SR transmission event.
9. The method of claim 1 , wherein the encoded information bits are scrambled with a UE-specific scrambling sequence.
10. The method of claim 1 , further comprising:
transmitting an uplink reference signal to the base station.
11. A user equipment (UE) in a wireless communication system, the UE comprising:
a radio frequency (RF) unit for transmitting or receiving a radio signal; and
a processor coupled to the RF unit, and configured to:
receive a scheduling request (SR) configuration for transmission of an SR bit through a radio resource control (RRC) layer from a base station;
perform channel coding on information bits of the UCI to generate encoded information bits, wherein the information bits of the UCI include hybrid automatic repeat request acknowledgement (HARQ-ACK) information bits for a plurality of serving cells and the SR bit, if transmission of the HARQ-ACK information bits coincides with a subframe, configured by the SR configuration, for transmission of the SR bit;
generate complex-valued modulation symbols by modulating the encoded information bits;
block-wise spread the complex-valued modulation symbols with an orthogonal code; and
transmit the spread complex-valued modulation symbols to the base station.
12. The UE of claim 11 , wherein the SR bit is appended at the end of the HARQ-ACK information bits.
13. The UE of claim 11 , wherein the HARQ-ACK information bits for a plurality of serving cells include concatenation of HARQ-ACK information bits for each of the plurality of serving cells.
14. The UE of claim 11 , wherein a number of the HARQ-ACK information bits for each of the plurality of serving cells is 1 bit.
15. The UE of claim 11 , wherein a number of the HARQ-ACK information bits for each of the plurality of serving cells is 2 bits.
16. The UE of claim 15 , wherein one of the HARQ-ACK information bits for each of the plurality of serving cells corresponds to an HARQ-ACK information bit for a first codeword, and
wherein a remaining bit of the HARQ-ACK information bits for each of the plurality of serving cells corresponds to an HARQ-ACK information bit for a second codeword.
17. The UE of claim 11 , wherein the SR bit is 1 bit.
18. The UE of claim 17 , wherein if a value of the SR bit is 1, it indicates a presence of an SR transmission event, and
wherein if a value of the SR bit is 0, it indicates an absence of the SR transmission event.
19. The UE of claim 11 , wherein the encoded information bits are scrambled with a UE-specific scrambling sequence.
20. The UE of claim 11 , wherein the processor is further configured to:
transmit an uplink reference signal to the base station.
21. The method of claim 1 , wherein the spread complex-valued modulation symbols are discrete Fourier transform (DFT)-precoded.
22. The UE of claim 11 , wherein the spread complex-valued modulation symbols are discrete Fourier transform (DFT)-precoded.