Method for transmitting/receiving data in wireless access system, and base station and user equipment for same
The present invention discloses a method for transmitting/receiving data in a wireless access system supporting carrier aggregation/multiple cells, and a base station and a user equipment for same. More particularly, the method comprises the following steps: transmitting downlink control information through a physical downlink control channel (PDCCH) for scheduling downlink data from a first subframe; and transmitting the downlink data, which is scheduled by the downlink control information from a second subframe, through a physical downlink shared channel (PDSCH), wherein the downlink control information includes a field indicating the second subframe from which the downlink data is transmitted.
1. A method of transmitting and receiving data in a wireless access system for supporting carrier aggregation, the method comprising:
transmitting downlink control information (DCI) for scheduling downlink data on a physical downlink control channel (PDCCH) in a first subframe; and
transmitting the downlink data scheduled according to the DCI on a physical downlink shared channel (PDSCH) in a second subframe which is not the first subframe,
wherein the DCI comprises a subframe indicator field (SIF) indicating the second subframe for transmission of the downlink data,
wherein same bits of the SIF indicate the second subframe differently, for a case when a direct mapping method is applied and for a case when a radio resource control (RRC) configured method is applied, and
wherein the direct mapping method is a scheme for determining the second subframe by using only the SIF, and the RRC configured method is a scheme for determining the second subframe by referring to a RRC signaling indicating a subframe.
2. The method according to claim 1 , wherein, when the direct mapping method is applied, the SIF indicates an interval between the first subframe and the second subframe.
3. The method according to claim 1 , wherein, when the direct mapping method is applied, the SIF indicates an index of the second subframe in a radio frame for transmission of the DCI.
4. The method according to claim 1 , wherein:
the SIF further indicates a carrier for transmission of the downlink data; and
the transmitting of the downlink data comprises transmitting the downlink data in the second subframe of a carrier indicated by the SIF.
5. The method according to claim 1 , wherein the transmitting of the downlink data comprises transmitting the downlink data in a carrier for transmission of the DCI.
6. The method according to claim 1 , further comprising indicating a carrier for transmission of the downlink data via upper layer signaling.
7. A base station (BS) for transmitting and receiving data in a wireless access system for supporting carrier aggregation, the BS comprising:
a radio frequency (RF) unit configured to transmit and receive a radio signal; and
a processor configured to:
transmit downlink control information (DCI) for scheduling downlink data on a physical downlink control channel (PDCCH) in a first subframe, and
transmit the downlink data scheduled according to the DCI on a physical downlink shared channel (PDSCH) in a second subframe which is not the first subframe,
wherein the DCI comprises a subframe indicator field (SIF) indicating the second subframe for transmission of the downlink data,
wherein same bits of the SIF indicate the second subframe differently, for a case when a direct mapping method is applied and for a case when a radio resource control (RRC) configured method is applied, and
wherein the direct mapping method is a scheme for determining the second subframe by using only the SIF, and the RRC configured method is a scheme for determining the second subframe by referring to a RRC signaling indicating a subframe.
8. The BS according to claim 7 , wherein, when the direct mapping method is applied, the SIF indicates an interval between the first subframe and the second subframe.
9. The BS according to claim 7 , wherein, when the direct mapping method is applied, the SIF indicates an index of the second subframe in a radio frame for transmission of the DCI.
10. The BS according to claim 7 , wherein:
the SIF further indicates a carrier for transmission of the downlink data; and
the processor transmits the downlink data in the second subframe of a carrier indicated by the SIF.
11. The BS according to claim 7 , wherein the processor transmits the downlink data in a carrier for transmission of the DCI.
12. The BS according to claim 7 , wherein the processor indicates a carrier for transmission of the downlink data via upper layer signaling.
13. A user equipment (UE) for transmitting and receiving data in a wireless access system for supporting carrier aggregation, the UE comprising:
a radio frequency (RF) unit configured to transmit and receive a radio signal; and
a processor configured to:
receive downlink control information (DCI) for scheduling downlink data on a physical downlink control channel (PDCCH) in a first subframe, and
receive the downlink data scheduled according to the downlink control information on a physical downlink shared channel (PDSCH) in a second subframe which is not the first subframe,
wherein the DCI comprises a subframe indicator field (SIF) indicating the second subframe for transmission of the downlink data,
wherein same bits of the SIF indicate the second subframe differently, for a case when a direct mapping method is applied and for a case when a radio resource control (RRC) configured method is applied, and
wherein the direct mapping method is a scheme for determining the second subframe by using only the SIF, and the RRC configured method is a scheme for determining the second subframe by referring to a RRC signaling indicating a subframe.
14. The UE according to claim 13 , wherein, when the direct mapping method is applied, the SIF indicates an interval between the first subframe and the second subframe.
15. The UE according to claim 13 , wherein, when the direct mapping method is applied, the SIF indicates an index of the second subframe in a radio frame for transmission of the DCI.
16. The UE according to claim 13 , wherein:
the SIF further indicates a carrier for transmission of the downlink data; and
the processor receives the downlink data in the second subframe of a carrier indicated by the SIF.
17. The UE according to claim 13 , wherein the processor receives the downlink data in a carrier for transmission of the DCI.
18. The UE according to claim 13 , wherein the processor receives a carrier for transmission of the downlink data via upper layer signaling.