Method for transmitting control information, and apparatus therefor

Abstract

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method for transmitting control information and an apparatus therefor, the method comprising the steps of: detecting one or more PDSCHs on a plurality of cells, wherein the plurality of cells are divided into a first cell set having PCell and a first SCell, and a second cell set having one or more second SCells; and as feedback for the one or more PDSCHs, transmitting HARQ-ACK information over PUCCH, wherein when the one or more PDSCHs are detected only in the first cell set, the HARQ-ACK information contains only a HARQ-ACK response for the first cell set, and when the one or more PDSCHs are detected at least in the second cell set, the HARQ-ACK information contains HARQ-ACK responses for both the first and the second cell sets.

1 - 10 . (canceled) 
     
     
         11 . A method for a user equipment (UE) to transmit control information in a wireless communication system, the method comprising:
 determining a reference value for a Physical Uplink Control Channel (PUCCH) format based on a number of symbols allocated for the PUCCH format, wherein the number of symbols allocated for the PUCCH format is variable;   based on a size of an Uplink Control Information (UCI) payload including Hybrid ARQ Acknowledgment (HARQ-ACK) information and channel state information (CSI) being larger than the reference value, reducing a size of the CSI so that a reduced UCI payload has a size no larger than the reference value; and   transmitting the reduced UCI payload via the symbols allocated for the PUCCH format.   
     
     
         12 . The method of  claim 11 , wherein the CSI includes periodic CSI (p-CSI). 
     
     
         13 . The method of  claim 11 , wherein a first reference payload size of the PUCCH format when the number of symbols is M is less than a second reference payload size of the PUCCH format when the number of symbols is N, and wherein M is less than N. 
     
     
         14 . The method of  claim 13 , wherein M is N−1. 
     
     
         15 . The method of  claim 11 , wherein the symbols includes Orthogonal Frequency Division Multiple Access (OFDMA)-based symbols. 
     
     
         16 . The method of  claim 11 , wherein the reduced UCI payload includes sub-blocks, and
 wherein each sub-block is mapped on a respective symbol of the PUCCH format after a discrete fourier transformation.   
     
     
         17 . The method of  claim 11 , wherein based on the size of the UCI payload being no larger than the reference value, further comprising:
 transmitting the UCI payload without UCI payload size reduction.   
     
     
         18 . A User Equipment (UE) configured to operate in a wireless communication system, the communication device comprising:
 at least one Radio Frequency (RF) units;   at least one processor; and   at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:   determining a reference value for a Physical Uplink Control Channel (PUCCH) format based on a number of symbols allocated for the PUCCH format, wherein the number of symbols allocated for the PUCCH format is variable,   based on a size of an Uplink Control Information (UCI) payload including Hybrid ARQ Acknowledgment (HARQ-ACK) information and channel state information (CSI) being larger than the reference value, reducing a size of the CSI so that a reduced UCI payload has a size no larger than the reference value, and   transmitting the reduced UCI payload via the symbols allocated for the PUCCH format.   
     
     
         19 . The UE of  claim 18 , wherein the CSI includes periodic CSI (p-CSI). 
     
     
         20 . The UE of  claim 18 , wherein a first reference payload size of the PUCCH format when the number of symbols is M is less than a second reference payload size of the PUCCH format when the number of symbols is N, and wherein M is less than N. 
     
     
         21 . The UE of  claim 20 , wherein M is N−1. 
     
     
         22 . The UE of  claim 18 , wherein the symbols includes Orthogonal Frequency Division Multiple Access (OFDMA)-based symbols. 
     
     
         23 . The UE of claim  8 , wherein the reduced UCI payload includes sub-blocks, and
 wherein each sub-block is mapped on a respective symbol of the PUCCH format after a discrete fourier transformation.   
     
     
         24 . The UE of  claim 18 , wherein based on the size of the UCI payload being no larger than the reference value, the operation further comprises:
 transmitting the UCI payload without UCI payload size reduction.   
     
     
         25 . A communication device configured to operate in a wireless communication system, the communication device comprising:
 at least one processor; and   at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:   determining a reference value for a Physical Uplink Control Channel (PUCCH) format based on a number of symbols allocated for the PUCCH format, wherein the number of symbols allocated for the PUCCH format is variable,   based on a size of an Uplink Control Information (UCI) payload including Hybrid ARQ Acknowledgment (HARQ-ACK) information and channel state information (CSI) being larger than the reference value, reducing a size of the CSI so that a reduced UCI payload has a size no larger than the reference value, and   transmitting the reduced UCI payload via the symbols allocated for the PUCCH format.   
     
     
         26 . The communication device of  claim 25 , wherein the CSI includes periodic CSI (p-CSI). 
     
     
         27 . The communication device of  claim 25 , wherein a first reference payload size of the PUCCH format when the number of symbols is M is less than a second reference payload size of the PUCCH format when the number of symbols is N, and wherein M is less than N. 
     
     
         28 . The communication device of  claim 27 , wherein M is N−1. 
     
     
         29 . The communication device of  claim 25 , wherein the symbols includes Orthogonal Frequency Division Multiple Access (OFDMA)-based symbols. 
     
     
         30 . The communication device of  claim 25 , wherein the reduced UCI payload includes sub-blocks, and
 wherein each sub-block is mapped on a respective symbol of the PUCCH format after a discrete fourier transformation.   
     
     
         31 . The communication device of  claim 25 , wherein based on the size of the UCI payload being no larger than the reference value, the operation further comprises:
 transmitting the UCI payload without UCI payload size reduction.