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 from a base station;
generating UCI information bits comprising an SR bit and hybrid automatic repeat request acknowledgement (HARQ-ACK) information bits for a plurality of component carriers (CCs),
wherein the SR bit is located at the end of the UCI information bits;
performing channel coding on information bits of the UCI to generate encoded information bits;
generating modulation symbols by modulating the encoded information bits;
spreading the modulation symbols with an orthogonal code; and
transmitting the spread modulation symbols to the base station on a physical uplink control channel (PUCCH).
2. The method of claim 1 , wherein the HARQ-ACK information bits for a plurality of CCs include concatenation of HARQ-ACK information bits for each of the plurality of CCs.
3. The method of claim 1 , wherein a number of the HARQ-ACK information bits for each of the plurality of CCs is 1 bit, when a transmission mode of each of the plurality of CCs is a single codeword transmission mode.
4. The method of claim 1 , wherein a number of the HARQ-ACK information bits for each of the plurality of CCs is 2 bits, when a transmission mode of each of the plurality of CCs is not a single codeword transmission mode.
5. The method of claim 4 ,
wherein one of the HARQ-ACK information bits for each of the plurality of CCs 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 CCs corresponds to an HARQ-ACK information bit for a second codeword.
6. The method of claim 1 , wherein the SR bit is 1 bit.
7. The method of claim 6 ,
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.
8. A user equipment (UE) in a wireless communication system, the UE comprising:
a radio frequency (RF) unit; and
a processor, coupled to the RF unit, that:
receives a scheduling request (SR) configuration from a base station;
generates UCI information bits comprising an SR bit and hybrid automatic repeat request acknowledgement (HARQ-ACK) information bits for a plurality of component carriers (CCs),
wherein the SR bit is located at the end of the UCI information bits;
performs channel coding on the UCI information bits to generate encoded information bits;
generates modulation symbols by modulating the encoded information bits;
spreads the modulation symbols with an orthogonal code; and
controls the RF unit to transmit the spread modulation symbols to the base station on a physical uplink control channel (PUCCH).
9. The UE of claim 8 , wherein the HARQ-ACK information bits for a plurality of CCs include concatenation of HARQ-ACK information bits for each of the plurality of CCs.
10. The UE of claim 8 , wherein a number of the HARQ-ACK information bits for each of the plurality of CCs is 1 bit, when a transmission mode of each of the plurality of CCs is a single codeword transmission mode.
11. The UE of claim 8 , wherein a number of the HARQ-ACK information bits for each of the plurality of CCs is 2 bits, when a transmission mode of each of the plurality of CCs is not a single codeword transmission mode.
12. The UE of claim 11 ,
wherein one of the HARQ-ACK information bits for each of the plurality of CCs 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 CCs corresponds to an HARQ-ACK information bit for a second codeword.
13. The UE of claim 8 , wherein the SR bit is 1 bit.
14. The UE of claim 13 ,
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.