Method and apparatus for transmitting ACK/NACK signal in wireless communication system
The present invention relates to a method and apparatus for transmitting an acknowledgement/not-acknowledgement (ACK/NACK) signal in a wireless communication system. The method includes the steps of: receiving a transmission block; and transmitting an ACK/NACK signal for the transmission block in a first subframe or a second subframe according to the size of the transmission block, wherein, when the size of the transmission block is smaller than or equal to a reference value, the ACK/NACK signal is transmitted in the first frame, when the size of the transmission block is greater than the reference value, the ACK/NACK signal is transmitted in the second subframe, and the second subframe is behind the first subframe in a time domain.
1. A method for receiving acknowledgement/not-acknowledgement (ACK/NACK) information, the method performed by a base station (BS) and comprising:
transmitting, to a user equipment (UE), a first downlink control information (DCI) or a second DCI;
transmitting, to the UE, a transport block which is scheduled by the first DCI or the second DCI; and
receiving, from the UE, ACK/NACK information for the transport block in a first subframe or a second subframe,
wherein:
when the BS has transmitted the first DCI, the BS receives the ACK/NACK information in the first subframe, and
when the BS has transmitted the second DCI, the BS receives the ACK/NACK information in the second subframe, and
wherein the second subframe is received later in time than the first subframe.
2. The method of claim 1 , wherein when a subframe receiving the transport block is subframe n, the first subframe is subframe n+4 and the second subframe is subframe n+k add , and
wherein k add is a natural number larger than 4.
3. The method of claim 1 , wherein when the first subframe is subframe n+k default , k default being any natural number larger than or equal to 4, the second subframe is subframe n+k default +k add , wherein k add is a natural number larger than 0.
4. The method of claim 1 , wherein:
when the first subframe is subframe n+k default , k default being any natural number larger than or equal to 4, and when the second subframe is subframe n+k default +k add ,
k add is one of a plurality of fixed values.
5. The method of claim 1 , wherein the second DCI includes a field indicating the second subframe.
6. A base station (BS), comprising:
a transceiver which transmits or receives a radio signal; and
a processor connected to the transceiver,
wherein the processor controls the transceiver to:
transmit, to a user equipment (UE), a first downlink control information (DCI) or a second DCI,
transmit, to the UE, a transport block which is scheduled by the first DCI or the second DCI and
receive, from the UE, ACK/NACK information for the transport block in a first subframe or a second subframe,
wherein:
when the BS has transmitted the first DCI, the BS receives the ACK/NACK information in the first subframe and
when the BS has transmitted the second DCI, the BS receives the ACK/NACK information in the second subframe, and
wherein the second subframe is received later in time than the first.
7. The BS of claim 6 , wherein when a subframe receiving the transport block is subframe n, the first subframe is subframe n+4 and the second subframe is subframe n+k add , and
wherein k add is a natural number larger than 4.
8. The BS of claim 6 , wherein when the first subframe is subframe n+k default , k default being any natural number larger than or equal to 4, the second subframe is subframe n+k default +k add , wherein k add is a natural number larger than 0.
9. The BS of claim 6 , wherein:
when the first subframe is subframe n+k default , k default being any natural number larger than or equal to 4, and when the second subframe is subframe n+k default +k add ,
k add is one of a plurality of fixed values.
10. The BS of claim 6 , wherein the second DCI includes a field indicating the second subframe.