Method and apparatus for transmitting data in a wireless communication system
Provided are a method and apparatus for transmitting data in a wireless communication system. The method comprises the steps of: setting up a frame including both a control domain for transmitting scheduling information to a first terminal and a data domain for transmitting first data to the first terminal; and transmitting, to a second terminal, second data in the control domain. The frame comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain. The control domain consists of a first number N (where N is any natural number equal to or less than 4) of OFDM symbols in the frame. The data domain consists of OFDM symbols other than a number N of OFDM symbols in the frame. The second data has a predetermined bit size.
1. A method of transmitting data in a wireless communication system, the method comprising:
configuring a subframe comprising a control region and a data region;
transmitting first data for a first user equipment (UE) in the data region; and
transmitting second data for a second UE in the control region,
wherein the subframe further comprises a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time domain,
wherein the control region comprises a first N OFDM symbols in the subframe and the data region comprises OFDM symbols other than the first N OFDM symbols in the subframe, N being a natural number 4 or less,
wherein the first data is scheduled according to scheduling information transmitted in the control region,
wherein the second data has no corresponding scheduling information in the control region,
wherein the scheduling information and the second data always have a same bit size, and
wherein the scheduling information and the second data each comprise a 1-bit indicator having a fixed bit size and the second data is distinguished from the scheduling information by a value of the indicator.
2. The method of claim 1 , wherein:
the scheduling information is masked as a first identifier (ID);
the second data is masked as a second ID; and
the first ID and the second ID are different UE-specific IDs.
3. The method of claim 1 , further comprising receiving an acknowledgement (ACK) for the second data.
4. The method of claim 3 , wherein:
the second data comprises a Transmission Power Control (TPC) field; and
the TPC field indicates a transmission power value of the ACK.
5. The method of claim 1 , further comprising:
configuring a search space that is a radio resource region; and
transmitting the second data in the configured search space.
6. The method of claim 1 , further comprising:
configuring an additional control region within the data region; and
transmitting the second data in the configured additional control region.
7. The method of claim 1 , wherein:
the second data comprises a New Data Indicator (NDI) field of at least 2 bits; and
a value of the NDI field indicates whether the second data is newly transmitted data or retransmitted data.
8. The method of claim 7 , wherein:
the NDI field has a different bit value depending upon whether the second data is newly transmitted data or retransmitted data.
9. The method of claim 1 , wherein the second data is a smaller amount of data than the first data.
10. The method of claim 1 , further comprising:
configuring a first search space that is a radio resource region and transmitting the scheduling information in the configured first search space; and
configuring a second search space that is a radio resource region distinguished from the configured first search space and transmitting the second data in the configured second search space.
11. A data transmission apparatus, comprising:
a Radio Frequency (RF) unit transmitting and receiving radio signals; and
a processor connected to the RF unit,
wherein the processor:
configures a subframe comprising a control region and a data region;
controls the RF unit to transmit first data for a first user equipment (UE) in the data region; and
controls the RF unit to transmit second data for a second UE in the control region,
wherein the subframe further comprises a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time domain,
wherein the control region comprises a first N OFDM symbols in the subframe and the data region comprises OFDM symbols other than the first N OFDM symbols in the subframe, N being a natural number 4 or less,
wherein the first data is scheduled according to scheduling information transmitted in the control region,
wherein the second data has no corresponding scheduling information in the control region,
wherein the scheduling information and the second data always have a same bit size, and
wherein the scheduling information and the second data each comprise a 1-bit indicator having a fixed bit size and the second data is distinguished from the scheduling information by a value of the indicator.
12. The apparatus of claim 11 , wherein:
the scheduling information is masked as a first identifier (ID);
the second data is masked as a second ID; and
the first ID and the second ID are different UE-specific IDs.
13. The apparatus of claim 11 , wherein the processor further:
configures a search space that is a radio resource region; and
controls the RF unit to transmit the second data in the configured search space.
14. The apparatus of claim 11 , wherein the processor further:
configures an additional control region within the data region; and
controls the RF unit to transmit the second data in the configured additional control region.
15. The apparatus of claim 11 , wherein the processor further:
configures a first search space that is a radio resource region and controls the RF unit to transmit the scheduling information in the configured first search space; and
configures a second search space that is a radio resource region distinguished from the configured first search space and controls the RF unit to transmit the second data in the configured second search space.
16. The apparatus of claim 11 , wherein the processor further controls the RF unit to receive an acknowledgment (ACK) for the second data.
17. The apparatus of claim 16 , wherein:
the second data comprises a Transmission Power Control (TPC) field; and
the TPC field indicates a transmission power value of the ACK.
18. The apparatus of claim 11 , wherein:
the second data comprises a New Data Indicator (NDI) field of at least 2 bits; and
a value of the NDI field indicates whether the second data is newly transmitted data or retransmitted data.
19. The apparatus of claim 18 , wherein:
the NDI field has a different bit value depending upon whether the second data is newly transmitted data or retransmitted data.
20. The apparatus of claim 11 , wherein the second data is a smaller amount of data than the first data.