Uplink transmission method in wireless communication system and device therefor
Disclosed are an uplink transmission method in a wireless communication system and a device therefor. Particularly, a method for performing uplink transmission by a user equipment (UE) in an unlicensed band in a wireless communication system may comprise the steps of: sensing a channel in an entire uplink frequency band, and then sensing a channel in a predetermined resource area during a predetermined first time interval; and as a result of the channel sensing, when the channel is determined to be idle, performing uplink transmission to an eNB in an uplink resource area allocated by the eNB, wherein the uplink transmission may not be mapped in an area overlapping the predetermined resource area during a predetermined second time interval in the allocated uplink resource area.
1. A method for performing uplink transmission in an unlicensed band by a user equipment (UE) in a wireless communication system, the method comprising:
transmitting, to a base station (BS), capability information,
wherein the capability information includes information related to a channel sensing supportable by the UE;
receiving, from the BS, an uplink grant including information related to the channel sensing supportable by the UE;
performing (i) channel sensing in an uplink frequency full band and then (ii) channel sensing in a first resource region for a predetermined first time duration, based on the uplink grant; and
transmitting, to the BS, uplink data in an uplink resource region of a channel determined to be idle as a result of the channel sensing in the first resource region,
wherein the uplink data is rate matched or punctured on a region overlapping with a second resource region for predetermined second time duration in the uplink resource region.
2. The method of claim 1 , wherein the first resource region is one or more resource blocks (RBs) or resource block groups (RBGs) located at a center of the uplink frequency full band, one or more RBs or RBGs having a lowest or a highest index in the uplink frequency full band, one or more RBs or RBGs having predetermined unit duration on a frequency axis in the uplink frequency full band, or one or more RBs or RBGs set by the BS.
3. The method of claim 1 , wherein the first resource region is one or more consecutive symbols or predetermined time duration.
4. The method of claim 1 , wherein the uplink data transmission starts at a predetermined subframe boundary or a predetermined symbol.
5. The method of claim 1 ,
wherein the uplink grant informs whether the uplink data is mapped in the region overlapping with the second resource region.
6. The method of claim 1 ,
wherein the uplink grant informs which type of channel sensing operation is to be performed among a plurality of predefined channel sensing operation types.
7. The method of claim 1 , wherein the UE is a UE indicated by the BS to perform the uplink transmission according to an Uplink Multi-User Multiple Input Multiple Output (UL MU-MIMO) transmission or Frequency Division Multiple Access (FDMA) transmission scheme.
8. The method of claim 1 , wherein the channel is a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), or a Physical Random Access Channel (PRACH).
9. The method of claim 1 , wherein a unit of the channel sensing for the uplink data transmission is set to be larger than a unit of channel sensing for downlink transmission.
10. The method of claim 1 ,
wherein the capability information further includes information for whether or not it is possible to perform the channel sensing in the first resource region for the predetermined first time duration.
11. The method of claim 1 ,
wherein the uplink data transmission is started after a specific time duration after the channel sensing is successful.
12. The method of claim 1 ,
wherein the second resource region is used for another channel sensing performed by another UE.
13. The method of claim 1 , further comprising:
transmitting, to the BS, a reservation signal to occupy the channel.
14. The method of claim 13 ,
wherein the reservation signal is rate matched, and
wherein the capability information further includes information for whether the UE supports transmission of the rate matched reservation signal or not.
15. A user equipment (UE) performing uplink transmission in an unlicensed band in a wireless communication system, the UE comprising:
a radio frequency (RF) unit for transmitting and receiving wireless signals; and
a processor for controlling the RF unit,
wherein the processor is configured:
to transmit, to a base station (BS), capability information,
wherein the capability information includes information related to a channel sensing supportable by the UE;
to receive, from the BS, an uplink grant including information related to the channel sensing supportable by the UE;
to perform (i) channel sensing in an uplink frequency full band and then (ii) channel sensing in a first resource region for a predetermined first time duration, based on the uplink grant; and
to transmit, to the BS, uplink data in an uplink resource region of a channel determined to be idle as a result of the channel sensing in the first resource region,
wherein the uplink data is rate matched or punctured on a region overlapping with a second resource region for predetermined second time duration in the uplink resource region.