Apparatus and method for transmitting uplink control information
The present invention is directed to a wireless communication system. Specifically, the present invention is directed to a method and apparatus for transmitting uplink control information through a Physical Uplink Shared Channel (PUSCH) at a user equipment, including receiving configuration information for periodic PUSCH transmission through a first protocol layer signaling, receiving information indicating activation or deactivation of the periodic PUSCH transmission through a second protocol layer signaling, wherein the second protocol layer is lower than the first protocol layer, and periodically transmitting the uplink control information through the PUSCH according to the configuration information if the periodic PUSCH transmission is activated.
1. A method for transmitting uplink control information through a Physical Uplink Shared Channel (PUSCH) at a user equipment (UE) in a wireless communication system, the method comprising:
receiving, by the UE, a Radio Resource Control (RRC) message indicating a time interval for a periodic PUSCH transmission;
receiving, by the UE, a Physical Downlink Control Channel (PDCCH) signal indicating activation of the periodic PUSCH transmission;
transmitting, by the UE, first channel-state information through a periodic PUSCH signal according to the time interval; and
transmitting, by the UE, second channel-state information through an aperiodic PUSCH re-transmission signal according to a Hybrid ARQ (HARQ) timing if the transmission of the periodic PUSCH signal fails,
wherein the second channel-state information is newly computed based on a Common Reference Signal (CRS) at the HARQ timing.
2. The method according to claim 1 , wherein the RRC message further includes at least one of Resource Block (RB) assignment information and a Modulation and Coding Scheme (MCS) for the periodic PUSCH transmission.
3. The method according to claim l, wherein the RRC message further includes identification information indicating that the periodic PUSCH transmission is for the uplink control information.
4. The method according to claim 1 ,
wherein the first channel-state information includes channel quality information based on a Channel State Information Reference Signal (CSI-RS) and interference information based on the CRS,
wherein the second channel-state information includes the channel quality information of the first channel-state information and interference information newly updated based on the CRS, and
wherein the CSI-RS is transmitted every N subframes, the CRS is transmitted every subframe, and N is a positive integer greater than 1.
5. A user equipment configured to transmit uplink control information through a Physical uplink Shared Channel (PUSCH) in a wireless communication system, the user equipment comprising:
a Radio Frequency (RF) unit configured to transmit or receive an RF signal to or from a transmitter; and
a processor connected to the RF unit and configured to
receive a Radio Resource Control (RRC) message indicating a time interval for a periodic PUSCH transmission;
receive a Physical Downlink Control Channel (PDCCH) signal indicating activation of the periodic PUSCH transmission;
transmit first channel-state information through a periodic PUSCH signal according to the time interval; and
transmit second channel-state information through an aperiodic PUSCH re-transmission signal according to a Hybrid ARQ (HARQ) timing if the transmission of the periodic PUSCH signal fails,
wherein the second channel-state information is newly computed based on a Common Reference Signal (CRS) at the HARQ timing.
6. The user equipment according to claim 5 , wherein the RRC message further includes at least one of Resource Block (RB) assignment information and a Modulation and Coding Scheme (MCS) for the periodic PUSCH transmission.
7. The user equipment according to claim 5 , wherein the RRC message further includes identification information indicating that the periodic PUSCH transmission is for uplink control information.
8. The user equipment according to claim 5 ,
wherein the first channel-state information includes channel quality information based on a Channel State Information Reference Signal (CSI-RS) and interference information based on the CRS,
wherein the second channel-state information includes the channel quality information of the first channel-state information and interference information newly updated based on the CRS, and
wherein the CSI-RS is transmitted every N subframes, the CRS is transmitted every subframe, and N is a positive integer greater than 1.