Method and apparatus for receiving ACK/NACK in wireless communication system
The present invention provides a method for receiving acknowledgement/not-acknowledgement (ACK/NACK) of a terminal in a wireless communication system. The method transmits uplink data through an uplink data channel and receives ACK/NACK for the uplink data. The uplink data channel is transmitted through aggregated carriers and the aggregated carriers include a first band recognizable to first and second type terminals and a second band recognizable only to the second type terminal.
1. A method for performing communication in a wireless communication system, the method performed by a user equipment (UE) comprising:
receiving physical hybrid-ARQ indicator channel (PHICH) information, the PHICH information indicating PHICH duration in a subframe;
receiving enhanced-physical downlink control channel (E-PDCCH) information the E-PDCCH information indicating a starting orthogonal frequency division multiplexing (OFDM) symbol of an E-PDCCH in the subframe; and
performing communication based on the E-PDCCH information and the PHICH information,
wherein the E-PDCCH information is received via a radio resource control (RRC) message, and
wherein, in the subframe, the starting OFDM symbol of the E-PDCCH is configured after an OFDM symbol indicated by the PHICH duration.
2. The method of claim 1 , wherein the PHICH information indicating the PHICH duration is received via another RRC message.
3. The method of claim 1 , wherein acknowledgement/not-acknowledgement (ACK/NACK) for uplink data which is transmitted from the UE is received during the OFDM symbol indicated by the PHICH duration.
4. The method of claim 1 , wherein the PHICH duration is normal PHICH duration or extended PHICH duration.
5. The method of claim 4 , wherein when the PHICH duration is the normal PHICH duration and the subframe is a non-Multicast-broadcast single frequency network (MBSFN) subframe, the PHICH duration is 1.
6. The method of claim 4 , wherein when the PHICH duration is normal PHICH and the subframe is a Multicast-broadcast single-frequency network (MBSFN) subframe on a carrier supporting a Physical Downlink Shared Channel (PDSCH), the PHICH duration is 1.
7. A user equipment (UE), the UE comprising:
a transceiver; and
a processor operatively coupled to the transceiver,
wherein the processor:
controls the transceiver to receive physical hybrid-ARQ indicator channel (PHICH) information, the PHICH information indicating PHICH duration in a subframe;
controls the transceiver to receive enhanced-physical downlink control channel (E-PDCCH) information, the E-PDCCH information indicating a starting orthogonal frequency division multiplexing (OFDM) symbol of an E-PDCCH in the subframe; and
performs communication based on the E-PDCCH information and the PHICH information,
wherein the E-PDCCH information is received via a radio resource control (RRC) message, and
wherein, in the subframe, the starting OFDM symbol of the E-PDCCH is configured after an OFDM symbol indicated by the PHICH duration.