Method and apparatus for performing uplink transmission in a wireless communication system
Disclosed are a method for performing uplink transmission in a wireless communication system and an apparatus therefor. Specifically, a method for performing uplink transmission in a wireless communication system, which is performed by a user equipment includes: receiving, from a base station, configuration information for performing uplink transmission without an uplink grant; and transmitting uplink data, to the base station, through at least one uplink resource configured based on the configuration information, in which the configuration information may be received through a higher layer signaling, and the configuration information may include information related to repetition transmission of the uplink data.
1. A method for performing uplink transmission in ultra-reliable low latency communication (URLLC), the method performed by a user equipment and comprising:
receiving, from a base station, first configuration information for dynamic grant-free uplink transmission, wherein the first configuration information is configured separately from second configuration information for dynamic grant-based uplink transmission to the user equipment; and
transmitting, to the base station, uplink data via PUSCH based on the first configuration information,
wherein the dynamic grant-free uplink transmission is semi-statically configured and the dynamic grant-based uplink transmission is dynamically configured, and
wherein the first configuration information is received through a higher layer signaling, and comprises (i) information related to a resource for transmission of the uplink data, (ii) information related to precoding and a number of layers, (iii) information related to initialization of a demodulation reference signal (DM-RS) sequence generator, and (iv) information related to whether to transmit a phase tracking reference signal (PT-RS).
2. The method of claim 1 , wherein the first configuration information further includes information related to a repetition transmission of the uplink data, and
wherein the information related to the repetition transmission includes information for a repetition number of the uplink data.
3. The method of claim 2 , wherein the repetition number is identically configured for slot based repetition transmission and non-slot based repetition transmission.
4. The method of claim 2 , wherein the first configuration information further includes information for hopping related to transmission of the uplink data.
5. The method of claim 1 , wherein the first configuration information further includes information for a waveform type to be applied to the dynamic grant-free uplink transmission, and
wherein the waveform type is configured to one of Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) or Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) based on the first configuration information.
6. The method of claim 5 , wherein the waveform type to be applied to the dynamic grant-free uplink transmission is configured to the user equipment further based on a resource allocation type included in the first configuration information.
7. The method of claim 6 , wherein, based on the resource being allocated contiguously, the waveform type is based on the DFT-s-OFDM, and
wherein, based on the resource being allocated non-contiguously, the waveform type is based on the CP-OFDM.
8. The method of claim 5 , wherein a Demodulation Reference Signal (DMRS) for the transmission of the uplink data is differently configured for a plurality of waveform types supported by the user equipment.
9. The method of claim 1 , wherein whether to transmit the PT-RS is configured in a same manner as in the dynamic grant-based uplink transmission to the user equipment, based on the information related to whether to transmit the PT-RS.
10. The method of claim 1 , wherein a waveform type to be applied to the dynamic grant-free uplink transmission is identically configured for a waveform type to be applied to the dynamic grant-based uplink transmission, based on that the first configuration information does not include information related to the waveform type to be applied to the dynamic grant-free uplink transmission.
11. A user equipment configured to perform uplink transmission in ultra-reliable low latency communication (URLLC), the user equipment comprising:
a Radio Frequency (RF) unit; and
a processor functionally connected to the RF unit,
wherein the processor is configured to control the user equipment to:
receive, from a base station, first configuration information for dynamic grant-free uplink transmission, wherein the first configuration information is configured separately from second configuration information for dynamic grant-based uplink transmission to the user equipment; and
transmit, to the base station, uplink data based on the first configuration information,
wherein the dynamic grant-free uplink transmission is semi-statically configured and the dynamic grant-based uplink transmission is dynamically configured, and
wherein the first configuration information is received through a higher layer signaling, and comprises (i) information related to a resource for the dynamic grant-free uplink transmission, (ii) information related to precoding and a number of layers, and (iii) information related to initialization of a reference signal sequence generator for the dynamic grant-free uplink transmission.
12. The user equipment of claim 11 , wherein the information further includes information related to a repetition transmission of the uplink data, and
wherein the information related to the repetition transmission includes information for a repetition number of the uplink data.
13. The user equipment of claim 12 , wherein the first configuration information further includes information for hopping related to transmission of the uplink data.
14. The user equipment of claim 11 , wherein the first configuration information further includes information for a waveform type to be applied to the dynamic grant-free uplink transmission, and
wherein the waveform type is configured to one of Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) or Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) based on the first configuration information.
15. The user equipment of claim 14 , wherein the waveform type to be applied to the dynamic grant-free uplink transmission is configured to the user equipment further based on a resource allocation type included in the first configuration information.